CN100473475C

CN100473475C - Top flush prevention electrohydraulic hammer

Info

Publication number: CN100473475C
Application number: CNB2006101147579A
Authority: CN
Inventors: 夏德仕
Original assignee: Individual
Current assignee: ANYANG FORGING PRESS MACHINERY INDUSTRY Co Ltd
Priority date: 2006-11-22
Filing date: 2006-11-22
Publication date: 2009-04-01
Anticipated expiration: 2026-11-22
Also published as: CN1986109A

Abstract

The electrohydraulic hammer includes a frame, a hammer stem driving cylinder, a hydraulic source, a hammer stem with hammer head in the lower end and upper end connected to the piston inside the hammer stem driving cylinder, an upper cylinder chamber and a lower cylinder chamber in the ends of the piston, and an operating valve with valve body, a servo valve inside the valve body and valve core capable of sliding inside the servo valve. When the valve core is in different position inside the servo valve, the operating valve can close the oil inlet passage of the upper cylinder chamber, the oil exhaust passage, or both the oil inlet passage and the oil exhaust passage. Between the driving cylinder and the operating valve, there is one buffering cylinder with excellent buffering effect to avoid bumping top after the hammer head reaches the top dead point.

Description

Electrohydraulic hammer

Technical field

The present invention relates to a kind of electric liquid hammer, particularly a kind of be used to forge with piling machinery and other utilize the hydraulic electrohydraulic hammer of hydraulic-driven mass work done.

Background technology

The electric liquid hammer of existing full hydraulic drive, its structure is a hammer stem piston cavity of resorption normal open hydraulic oil, realize the strike and the backhaul of forging hammer by the turnover of the oil of control valve control hammer stem piston upper chamber, as the patent No. disclosed two technical schemes in 93120993.5,02218450.3 the patent specification, these two technical scheme principles are basic identical, and are just different on the structure of control valve and the principle.What application number was that 93120993.5 patents use is the direct driven plunger of hydraulic pressure, drives cone valve with piston rod and realizes hitting and backhaul, and action is to open one the tunnel in addition to mould, is realized by the reversal valve of certain latus rectum.The everything of forging hammer needs two cover control systems, and is comparatively complicated, can not accomplish stepless speed regulation.Application number is 02218450.3 patent, system is simple relatively, but can not realize slowly going up action down and slowly, can not realize that the optional position stops hammer, hammer stem can only be stabilized in top dead-centre or bottom dead centre, more than two disclosed technical schemes of patent all can not realize stepless speed regulation, so opening speed is uncontrollable, the former capital is difficult to touching soon of forging hammer of realization and beats, and when tup is back to top dead-centre, occur hitting the top phenomenon easily, this is the fatal shortcoming of prior art.

Summary of the invention

The purpose of this invention is to provide a kind of ram velocity controlled, can realize tup touch soon beat, the optional position can stop to hammer into shape, tup does not hit the top phenomenon when arriving top dead-centre, shock-absorbing capacity is good electrohydraulic hammer, overcome the deficiencies in the prior art.

Electrohydraulic hammer of the present invention, it comprises support, hammer stem fixing in support drives oil cylinder, the hammer stem of hydraulic power source and lower end band tup, the piston that the upper end of hammer stem and hammer stem drive in the cylinder block links to each other, on the piston, following two ends have upper cylinder half chamber and following cylinder chamber, piston is playing the indoor effective work area of cylinder in the indoor effective work area of upper cylinder half greater than it, following cylinder chamber communicates with high-pressure oil passage, high-pressure oil passage communicates with hydraulic power source, it is characterized in that: the upper cylinder half chamber communicated with oil inlet passage respectively by the control of control valve or oil drain passage communicates, control valve comprises valve body, be provided with servo valve in the valve body, be provided with spool in the servo valve slidably, one end of spool links to each other with the spool control lever, when spool is positioned at an end of servo valve, control valve connects the oil inlet passage of upper cylinder half chamber and cuts out oil drain passage simultaneously, when spool is positioned at the other end of servo valve, control valve cuts out the oil inlet passage of upper cylinder half chamber and connects oil drain passage simultaneously, when spool is positioned at the middle part of servo valve, control valve cuts out the oil inlet passage and the oil drain passage of upper cylinder half chamber simultaneously, be provided with cushion cylinder between hammer stem driving oil cylinder and control valve, the epicoele of cushion cylinder is connected with high-pressure oil passage.

Electrohydraulic hammer of the present invention, wherein between described control valve and cushion cylinder, be provided with the execution servo valve, carry out servo valve and comprise the valve seat that is arranged at hammer stem driving cylinder block top, the inner chamber of valve seat communicates with described upper cylinder half chamber, can slide up and down to be provided with the servo-actuated valve pocket in the valve seat, the bottom of described spool links to each other with the top of servo-actuated valve pocket, when spool is positioned at an end of servo valve, the oil inlet passage that control valve is connected the upper cylinder half chamber by the servo valve cover is closed oil drain passage simultaneously, when spool is positioned at the other end of servo valve, the oil inlet passage that control valve cuts out the upper cylinder half chamber by the servo-actuated valve pocket is connected oil drain passage simultaneously, when spool was positioned at the middle part of servo valve, control valve cut out the oil inlet passage and the oil drain passage of upper cylinder half chamber simultaneously by the servo-actuated valve pocket.

Electrohydraulic hammer of the present invention, wherein the valve seat madial wall place that matches with described servo-actuated valve pocket is provided with oil-discharging cavity and high-voltage oil cavity from top to bottom successively, high-voltage oil cavity communicates with described high-pressure oil passage by at least one the fast fuel feed hole on the oil inlet passage of described upper cylinder half chamber, described oil-discharging cavity communicates with described fuel tank by the oil pipe line of the oil drain passage of described upper cylinder half chamber, the top of described servo-actuated sleeve side wall is provided with at least one outage that can be communicated with oil-discharging cavity and valve seat cavity of resorption, the top of servo-actuated valve pocket is provided with at least one oil guiding hole that can be communicated with shoe cream room and valve seat cavity of resorption, the cavity of resorption of valve seat communicates with described upper cylinder half chamber, described valve body is positioned at the top of valve seat, the bottom of described servo valve links to each other with the top of described servo-actuated valve pocket, be provided with pressure-releasing cavity between the lateral wall of servo valve and the madial wall of described valve body from bottom to top successively, following actuator chamber, oil back chamber, last actuator chamber and outer high pressure oil suction chamber, the upper end that is positioned at servo valve in the described valve body is provided with low-pressure cavity, the lower end that is positioned at servo valve in the valve body is provided with down low-pressure cavity, last low-pressure cavity, following low-pressure cavity and pressure-releasing cavity communicate with described fuel tank by pipeline, described high pressure oil suction chamber communicates with described hydraulic power source by oil-in, be divided into inner high voltage oil-feed cavity of resorption by the annular shoulder of spool lateral wall successively from bottom to top between the madial wall of described servo valve and the lateral wall of described spool, interior low-pressure cavity and inner high voltage oil-feed epicoele, inner high voltage oil-feed cavity of resorption can communicate with following actuator chamber by oilhole, inner high voltage oil-feed cavity of resorption communicates by the connecting hole that passes described spool with inner high voltage oil-feed epicoele, described inner high voltage oil-feed epicoele communicates with outer high pressure oil suction chamber by the repairing hole, the described actuator chamber of going up communicates with interior low-pressure cavity or described inner high voltage oil-feed epicoele by oilhole, described oil back chamber communicates with interior low-pressure cavity by oilhole, and described actuator chamber down can communicate with interior low-pressure cavity or described inner high voltage oil-feed cavity of resorption by oilhole.

Electrohydraulic hammer of the present invention, wherein the valve seat madial wall place that matches with described servo-actuated valve pocket is provided with oil-discharging cavity and high-voltage oil cavity from top to bottom successively, high-voltage oil cavity communicates with described high-pressure oil passage by at least one the fast fuel feed hole on the oil inlet passage of described upper cylinder half chamber, described oil-discharging cavity communicates with described fuel tank by the oil pipe line of the oil drain passage of described upper cylinder half chamber, the top of servo-actuated sleeve side wall is provided with at least one outage that can be communicated with shoe cream room and valve seat cavity of resorption, the cavity of resorption of valve seat communicates with described upper cylinder half chamber, described valve body is positioned at the top of valve seat, the bottom of described servo valve links to each other with the top of described servo-actuated valve pocket, be provided with middle pressure-releasing cavity between the lateral wall of servo valve and the madial wall of described valve body from bottom to top successively, actuator chamber and last high pressure oil suction chamber, the effective work area that acts on servo valve in the actuator chamber is greater than in the high-voltage oil cavity and act on effective work area sum of described servo-actuated valve pocket in the valve seat cavity of resorption, the upper end that is positioned at servo valve in the described valve body is provided with pressure-releasing cavity, the lower end that is positioned at described spool in the servo valve is provided with down pressure-releasing cavity, last pressure-releasing cavity, following pressure-releasing cavity and middle pressure-releasing cavity communicate with described fuel tank by pipeline, the described high pressure oil suction chamber of going up communicates with described hydraulic power source, pressure-releasing cavity and inner high voltage epicoele in being divided into by the annular shoulder of spool lateral wall successively from bottom to top between the madial wall of described servo valve and the lateral wall of described spool, interior pressure-releasing cavity can communicate with described middle pressure-releasing cavity or described actuator chamber by oilhole, and described inner high voltage epicoele can communicate with described upward high pressure oil suction chamber or actuator chamber by oilhole.

Electrohydraulic hammer of the present invention, wherein the top of the valve seat sidewall that matches with described servo-actuated valve pocket is provided with and unloads oilhole, unloading the oil pipe line of oilhole by described oil drain passage communicates with fuel tank, bottom in the described valve seat communicates with the top of described upper cylinder half chamber, the valve seat side-walls that matches with the servo-actuated valve pocket is provided with control chamber from top to bottom successively, normal low-pressure cavity and high-voltage oil cavity, servo valve is enclosed within the interior effective work area of control chamber greater than its effective work area in high-voltage oil cavity, normal low-pressure cavity communicates with fuel tank by pipeline, described high-voltage oil cavity communicates with described high-pressure oil passage by the fast fuel feed hole on the oil inlet passage of described upper cylinder half chamber, control chamber communicates with the working hole of control valve by pipeline, be provided with the front wheel driving chamber between the lateral wall of described servo valve and the madial wall of described valve body from bottom to top successively, outer low-pressure cavity, outer working chamber, outer high pressure chest and rear drive chamber, the effective work area of servo valve in the front wheel driving chamber is greater than its effective work area in the rear drive chamber, the lower end that is positioned at servo valve in the described valve body is provided with preceding low-pressure cavity, the upper end that is positioned at servo valve in the valve body is provided with the back low-pressure cavity, preceding low-pressure cavity, back low-pressure cavity and described outer low-pressure cavity communicate with described fuel tank by pipeline, described outer high pressure chest communicates with described high-pressure oil passage by pipeline, inner high voltage chamber before being divided into by the annular shoulder of spool lateral wall successively from bottom to top between the madial wall of described servo valve and the lateral wall of described spool, interior low pressure oil pocket, interior working chamber and inner high voltage chamber, back, preceding inner high voltage chamber communicates by the connecting hole that passes described spool with inner high voltage chamber, back, interior low pressure oil pocket communicates with outer low-pressure cavity by oilhole, interior working chamber communicates with outer working chamber by oilhole, described working hole communicates with outer working chamber, inner high voltage chamber, described back communicates with described outer high pressure chest and described rear drive chamber by oilhole respectively, described front wheel driving chamber can communicate with described preceding inner high voltage chamber or described interior low pressure oil pocket respectively by oilhole, described outer low-pressure cavity can communicate with described outer working chamber, and inner high voltage chamber, described back can communicate with described interior working chamber.

Electrohydraulic hammer of the present invention, wherein said cushion cylinder structure is: drive on the cylinder block at hammer stem and be fixed with cushion dashpot seat, cushion dashpot, buffering cylinder cap from bottom to top successively, is furnished with damper piston in the cushion dashpot, the inner chamber of damper piston is communicated with the upper cylinder half chamber, between damper piston, cushion dashpot, buffering cylinder cap, surround epicoele, be provided with through hole between epicoele and the high-pressure oil passage.

Electrohydraulic hammer of the present invention, the wherein said buffering cylinder cap bottom outside is provided with chamfering.

Electrohydraulic hammer of the present invention, the indoor bottom of wherein said upper cylinder half has the pocketed oil chamber, the pocketed oil chamber is madial wall, the bottom of described damper piston, the top of described piston and the axle journal institute area surrounded on piston top that is driven cylinder block by described hammer stem, the axle journal on piston top can match with the madial wall of damper piston bottom, described high-pressure oil passage is positioned at the support that drives the cylinder block sidewall around hammer stem, and the lower through-hole on the described hammer stem driving cylinder block and the quantity of described fast fuel feed hole are 2-8.

Electrohydraulic hammer of the present invention, wherein said hydraulic power source comprises hydraulic pump, the inlet of hydraulic pump communicates with described fuel tank by the pipeline that is in series with filter, the liquid outlet of hydraulic pump is in parallel with two-position two-way solenoid valve and hydraulic accumulator respectively by the pipeline that is in series with check valve, two-position two-way solenoid valve communicates with described high-pressure oil passage by pipeline, the control circuit of two-position two-way solenoid valve is electrically connected with travel switch or near switch and hydraulic pump, travel switch or match with described hammer stem near the touch device of switch, the pipeline place of hydraulic pump liquid outlet is parallel with unloader, and the liquid outlet of unloader communicates with described fuel tank by pipeline.

Electrohydraulic hammer of the present invention, two ends of wherein said servo-actuated valve pocket have the stagnant oil pocket of buffering of annular respectively, and the stagnant oil pocket of buffering is lateral wall and the described valve base cavity institute area surrounded by described servo-actuated valve pocket two ends.

Hydraulic electrohydraulic hammer of the present invention, the oil inlet passage of its upper cylinder half chamber and oil drain passage communicate with control valve respectively, control valve comprises valve body, be provided with servo valve in the valve body, be provided with spool in the servo valve slidably, one end of spool links to each other with the spool control lever, when spool is positioned at an end of servo valve, control valve connects the oil inlet passage of upper cylinder half chamber and cuts out oil drain passage simultaneously, when spool is positioned at the other end of servo valve, control valve cuts out the oil inlet passage of upper cylinder half chamber and connects oil drain passage simultaneously, and when spool was positioned at the zero-bit at middle part of servo valve, control valve cut out the oil inlet passage and the oil drain passage of upper cylinder half chamber simultaneously.Because reasonable in design, so no matter tup and hammer stem are in any motion state, as long as spool is moved on to zero-bit, the stop motion at once of tup and hammer stem is so this system can realize that the optional position stops hammer.Because the motion of hammer stem can stepless speed regulation, the hammer stem speed-controllable is beaten so can realize that forging hammer touches soon, can better meet the forging hammer technological requirement.Owing to above being positioned at piston on the driving cylinder block, be fixed with the cushion dashpot seat from bottom to top successively, cushion dashpot, the buffering cylinder cap, is furnished with damper piston in the cushion dashpot, the inner chamber of damper piston is communicated with the upper cylinder half chamber, at damper piston, cushion dashpot, surround epicoele between the buffering cylinder cap, be provided with through hole between epicoele and the high-pressure oil passage, during backhaul, elder generation contact damper piston base makes on it and moves before piston reaches top dead-centre, epicoele is communicated with high-pressure oil passage simultaneously, and cavity of resorption has certain vacuum at this moment, the high pressure of epicoele and the vacuum of cavity of resorption play and stop the effect that moves on the piston, have tangible pooling feature.Because the following outside at the buffering cylinder cap is provided with chamfering, when moving to the shutoff through hole on the damper piston, form a high pressure enclosed cavity at the chamfering place, absorb energy once more, further play cushioning effect.

Below in conjunction with drawings and Examples in detail the present invention is described in detail.

Description of drawings

Fig. 1 is the structural representation of the embodiment 1 of electrohydraulic hammer of the present invention;

Fig. 2 is the structural representation of the embodiment 2 of electrohydraulic hammer of the present invention;

Fig. 3 is the structural representation of the embodiment 3 of electrohydraulic hammer of the present invention.

The specific embodiment

As shown in Figure 1, electrohydraulic hammer of the present invention, the hammer stem that comprises support 39 and vertically be installed in the support 39 drives oil cylinder, the top that hammer stem drives cylinder block 12 is equipped with control valve, control valve shown in Fig. 3 is the state of spool 18 when being in zero-bit, the piston 11 that the upper end of the hammer stem 7 of lower end band tup 8 and hammer stem drive in the cylinder block 12 links to each other, on the piston 11, following two ends have upper cylinder half chamber 13 and following cylinder chamber 14, the effective work area of piston 11 in upper cylinder half chamber 13 is greater than its effective work area in following cylinder chamber 14, following cylinder chamber 14 links to each other with high-pressure oil passage 15 by at least one lower through-hole 22, the quantity of lower through-hole 22 can be 2 or 4 or 6 or 8, high-pressure oil passage 15 is communicated with hydraulic power source by two-position two-way solenoid valve 4, the oil inlet passage of upper cylinder half chamber 13 and oil drain passage communicate with control valve respectively, control valve comprises valve body 9, be provided with servo valve 17 in the valve body 9, be provided with spool 18 in the servo valve 17 slidably, the upper end of spool 18 links to each other with spool control lever 37, when spool 18 is positioned at the upper end of servo valve 17, control valve connects the oil inlet passage of upper cylinder half chamber 13 and cuts out oil drain passage simultaneously, when spool 18 is positioned at the lower end of servo valve 17, control valve cuts out the oil inlet passage of upper cylinder half chamber 13 and connects oil drain passage simultaneously, when spool 18 was positioned at the middle part zero-bit of servo valve 17, control valve cut out the oil inlet passage and the oil drain passage of upper cylinder half chamber 13 simultaneously.

The top that hammer stem drives cylinder block 12 is provided with the execution servo valve, carry out servo valve and comprise the valve seat 10 that is arranged at hammer stem driving cylinder block 12 tops, the inner chamber of valve seat 10 communicates with upper cylinder half chamber 13, can slide up and down to be provided with servo-actuated valve pocket 41 in the valve seat 10, servo valve 17 be arranged at servo-actuated valve pocket 41 above, when spool 18 is positioned at the upper end of servo valve 17, the oil inlet passage that control valve is connected upper cylinder half chamber 13 by servo-actuated valve pocket 41 is closed oil drain passage simultaneously, when spool 18 is positioned at the lower end of servo valve 17, the oil inlet passage that control valve cuts out upper cylinder half chamber 13 by servo-actuated valve pocket 41 is connected oil drain passage simultaneously, when spool 18 was positioned at the middle part of servo valve 17, control valve cut out the oil inlet passage and the oil drain passage of upper cylinder half chamber 13 simultaneously by servo-actuated valve pocket 41.

Two ends of servo-actuated valve pocket 41 have the stagnant oil pocket 77 of buffering of annular respectively, and the stagnant oil pocket 77 of buffering is lateral wall and the valve seat 10 inner chambers institute area surrounded by servo-actuated valve pocket 41 2 ends.The valve seat 10 madial wall places that match with servo-actuated valve pocket 41 are provided with oil-discharging cavity 42 and high-voltage oil cavity 19 from top to bottom successively, high-voltage oil cavity 19 communicates with high-pressure oil passage 15 by the fast fuel feed hole 16 on the oil inlet passage of upper cylinder half chamber 13, oil-discharging cavity 42 communicates with fuel tank 1 by the oil pipe line 68 of the oil drain passage of upper cylinder half chamber 13, the top of servo-actuated valve pocket 41 sidewalls is provided with at least one outage 45 that can be communicated with oil-discharging cavity 42 and valve seat 10 cavity of resorptions, the quantity of outage 45 can be 2 or 4 or 6 or 8, the top of servo-actuated valve pocket 41 is provided with at least one oil guiding hole 47 that can be communicated with shoe cream room 46 and valve seat 10 cavity of resorptions, the quantity of oil guiding hole 47 can be 2 or 4 or 6 or 8, the cavity of resorption of valve seat 10 communicates with upper cylinder half chamber 13, make hydraulic oil in the shoe cream room 46 can flow in valve seat 10 cavity of resorptions freely and in the upper cylinder half chamber 13, the top of valve seat 10 is provided with valve body 9, the bottom of servo valve 17 links to each other with the top of servo-actuated valve pocket 41, be provided with pressure-releasing cavity 40 between the madial wall of the lateral wall of servo valve 17 and valve body 9 from bottom to top successively, following actuator chamber 27, oil back chamber 21, last actuator chamber 28 and outer high pressure oil suction chamber 43, the upper end that is positioned at servo valve 17 in the valve body 9 is provided with low-pressure cavity 29, the lower end that is positioned at servo valve 17 in the valve body 9 is provided with down low-pressure cavity 30, last low-pressure cavity 29, following low-pressure cavity 30 and pressure-releasing cavity 40 communicate with fuel tank 1 by pipeline, outer high pressure oil suction chamber 43 communicates with hydraulic power source by oil-in 44, be divided into inner high voltage oil-feed cavity of resorption 32 by the annular shoulder of spool 18 lateral walls successively from bottom to top between the lateral wall of the madial wall of servo valve 17 and spool 18, interior low-pressure cavity 51 and inner high voltage oil-feed epicoele 33, inner high voltage oil-feed cavity of resorption 32 can communicate with following actuator chamber 27 by oilhole, inner high voltage oil-feed cavity of resorption 32 communicates by the connecting hole 48 that passes spool 18 with inner high voltage oil-feed epicoele 33, inner high voltage oil-feed epicoele 33 can communicate with outer high pressure oil suction chamber 43 by oilhole, last actuator chamber 28 can alternately communicate with interior low-pressure cavity 51 or inner high voltage oil-feed epicoele 33 by oilhole, oil back chamber 21 communicates with interior low-pressure cavity 51 by oilhole, and following actuator chamber 27 can alternately communicate with interior low-pressure cavity 51 or inner high voltage oil-feed cavity of resorption 32 by oilhole.

When work, when touching, needs tup 8 beats soon or energetically fast during strike downwards, can utilize spool control lever 37 that spool 18 is upwards risen to the appropriate location or is promoted to the extreme higher position, at this moment, inner high voltage oil-feed epicoele 33 communicates with outer high pressure oil suction chamber 43 by oilhole, inner high voltage oil-feed cavity of resorption 32 communicates with following actuator chamber 27 by oilhole, last actuator chamber 28 communicates with interior low-pressure cavity 51 by oilhole, make and go up in the actuator chamber 28 owing to after interior low-pressure cavity 51 releases, be in low-pressure state, be in high pressure conditions in the following actuator chamber 27, cause down pressure in the actuator chamber 27 to be higher than the interior pressure of actuator chamber 28, so, servo valve 17 moves upward, the servo valve 17 that moves upward can be with servo-actuated valve pocket 41 to move upward, make high-voltage oil cavity 19 communicate with upper cylinder half chamber 13 by the cavity of resorption of valve seat 10, hydraulic oil enters in the upper cylinder half chamber 13, the cavity of resorption of valve seat 10 and oil-discharging cavity 42 disconnect simultaneously, because the effective work area of piston 11 in upper cylinder half chamber 13 is greater than its effective work area in following cylinder chamber 14, under the effect of hydraulic oil, piston 11 can move downward fast, is being with tup 8 to hit work done downwards by hammer stem 7.

When needs tup 8 moves upward or move upward fast, can utilize spool control lever 37 that spool 18 is reduced to the appropriate location downwards or is reduced to extreme lower position, at this moment, inner high voltage oil-feed epicoele 33 communicates with last actuator chamber 28, inner high voltage oil-feed epicoele 33 communicates with outer high pressure oil suction chamber 43 by oilhole simultaneously, be in high pressure conditions in the actuator chamber 28 in the order, inner high voltage oil-feed cavity of resorption 32 then disconnects with following actuator chamber 27, following actuator chamber 27 communicates with interior low-pressure cavity 51 by oilhole, make and after interior low-pressure cavity 51 releases, be in low-pressure state in the actuator chamber 27 down, cause down the pressure in the actuator chamber 27 to be lower than the pressure of going up in the actuator chamber 28, so, servo valve 17 moves downward, the servo valve 17 that moves downward can be with servo-actuated valve pocket 41 to move downward, make the high-voltage oil cavity 19 and the cavity of resorption of valve seat 10 disconnect, the cavity of resorption of valve seat 10 communicates with outage 45 simultaneously, make the cavity of resorption of upper cylinder half chamber 13 through valve seat 10, outage 45, oil pipe line 68 releases of oil-discharging cavity 42 and oil drain passage, under the effect of following cylinder chamber 14 inner high voltage oil, piston 11 can move upward at a slow speed or fast, and piston 11 is being with tup 8 also to move upward by hammer stem 7.

When 8 stop motions of needs tup, can utilize spool control lever 37 that spool 18 is stopped appropriate location to middle zero-bit, at this moment, last actuator chamber 28,27 whiles of following actuator chamber and interior low-pressure cavity 51 disconnect, inner high voltage oil-feed epicoele 33 disconnects with last actuator chamber 28,32 of inner high voltage oil-feed cavity of resorptions and following actuator chamber 27 disconnect, thereby order actuator chamber 27 interior pressure down equals actuator chamber 28, so, servo valve 17 stop motions, and this moment, high-voltage oil cavity 19 disconnected with the cavity of resorption of valve seat 10, the cavity of resorption of valve seat 10 and oil-discharging cavity 42 disconnections simultaneously, piston 11 stop motion immediately.

Be fixed with cushion dashpot seat 80, cushion dashpot 81, buffering cylinder cap 85 from bottom to top successively above being positioned at piston 11 on the driving cylinder block 12, driving cylinder block 12, cushion dashpot seat 80, cushion dashpot 81, cushioning cylinder cap 85 is integral body of coaxial package.Is furnished with damper piston 84 in the cushion dashpot 81, the inner chamber of damper piston 84 is communicated with upper cylinder half chamber 13, when damper piston 84 is positioned at the below, between damper piston 84, cushion dashpot 81, buffering cylinder cap 85, surround epicoele 82, be processed with at least one through hole 83 between epicoele 82 and the high-pressure oil passage 15.Between damper piston 84 and the buffering cylinder cap 85, between damper piston 84 and the cushion dashpot 81, between damper piston 84 and the cushion dashpot seat 80 V-shaped seal ring is housed all, in case stopping leak dew.Up and absorbed after certain energy by pocketed oil chamber 38 when piston 11, the lower end that piston 11 is run into damper piston 84 again makes on it to be moved, and absorbs energy by epicoele 82 again, reaches the efficient buffer purpose.

In order to have better buffering effect, bottom in the upper cylinder half chamber 13 is provided with pocketed oil chamber 38, pocketed oil chamber 38 is madial wall, the bottom of damper piston 84, the top of piston 11 and the axle journal institute area surrounded on piston 11 tops that driven cylinder block 12 by hammer stem, and the axle journal on piston 11 tops can match with the madial wall of damper piston 84 bottoms.When the hammer stem quick return arrives top dead-centre, because hammer stem 7 is driving the tup 8 of big quality, so the inertia that rises is bigger, so the buffer unit on crashproof top must be set.The present invention adopts the principle of pocketed oil chamber 38 and the stagnant oil pocket 77 of buffering, be about to kinetic energy be converted into pressure can mode reach the purpose of hammer stem 7 and servo-actuated valve pocket 41 bufferings, concrete way is the axle journal that processes certain altitude in piston 11 upper ends, the diameter of axle journal is less than piston diameter, form ring-type pocketed oil chamber 38 with certain depth in damper piston 84 lower ends, when the lower end that hammer stem 7 goes upward to the upper edge of axle journal of piston 11 and pocketed oil chamber 38 overlaps, can form a high pressure pocketed oil chamber 38 of sealing relatively, suddenly the hydraulic oil that raises in the pocketed oil chamber 38 can be extruded along the axle journal of piston 11 and the gap between the valve seat 10, the energy that consumes hammer stem 7 and tup 8 slows down hammer stem 7 and tup 8, finally slowly stops to top dead-centre.For 41 of servo-actuated valve pockets is the stagnant oil pocket 77 of buffering that is respectively equipped with annular at its two end, when servo-actuated valve pocket 41 moves to a certain end, can form a stagnant oil pocket 77 of high-pressure buffer of sealing relatively, the stagnate hydraulic oil that raises suddenly in the oil pocket 77 of buffering can be extruded along the gap of 10 of servo-actuated valve pocket 41 and valve seats, and the energy that consumes servo-actuated valve pocket 41 slows down servo-actuated valve pocket 41 and finally slowly stops.

Above-mentioned hammer stem drives cylinder block 12 and is fixed in the support 39, and high-pressure oil passage 15 is positioned at the support 39 that drives cylinder block 12 sidewalls around hammer stem.

As shown in Figure 2, the hammer stem that comprises support 39 and vertically be installed in the support 39 drives oil cylinder, the top that hammer stem drives cylinder block 12 is equipped with control valve, control valve shown in Fig. 2 is the state of spool 18 when being in zero-bit, the piston 11 that the upper end of the hammer stem 7 of lower end band tup 8 and hammer stem drive in the cylinder block 12 links to each other, on the piston 11, following two ends have upper cylinder half chamber 13 and following cylinder chamber 14, the effective work area of piston 11 in upper cylinder half chamber 13 is greater than its effective work area in following cylinder chamber 14, following cylinder chamber 14 links to each other with high-pressure oil passage 15 by at least one lower through-hole 22, the quantity of lower through-hole 22 can be 2 or 4 or 6 or 8, high-pressure oil passage 15 is communicated with hydraulic power source by two-position two-way solenoid valve 4, the oil inlet passage of upper cylinder half chamber 13 and oil drain passage communicate with control valve respectively, control valve comprises valve body 9, be provided with servo valve 17 in the valve body 9, be provided with spool 18 in the servo valve 17 slidably, the upper end of spool 18 links to each other with spool control lever 37, when spool 18 is positioned at the upper end of servo valve 17, control valve connects the oil inlet passage of upper cylinder half chamber 13 and cuts out oil drain passage simultaneously, when spool 18 is positioned at the lower end of servo valve 17, control valve cuts out the oil inlet passage of upper cylinder half chamber 13 and connects oil drain passage simultaneously, when spool 18 was positioned at the middle part zero-bit of servo valve 17, control valve cut out the oil inlet passage and the oil drain passage of upper cylinder half chamber 13 simultaneously.

The top that hammer stem drives cylinder block 12 is provided with the execution servo valve, carry out servo valve and comprise the valve seat 10 that is fixed on the hammer stem driving cylinder block 12, the inner chamber of valve seat 10 communicates with upper cylinder half chamber 13, can slide up and down to be provided with servo-actuated valve pocket 41 in the valve seat 10, the bottom of spool 18 links to each other with the top of servo-actuated valve pocket 41, when spool 18 is positioned at the upper end of servo valve 17, the oil inlet passage that control valve is connected upper cylinder half chamber 13 by servo-actuated valve pocket 41 is closed oil drain passage simultaneously, when spool 18 is positioned at the lower end of servo valve 17, the oil inlet passage that control valve cuts out upper cylinder half chamber 13 by servo-actuated valve pocket 41 is connected oil drain passage simultaneously, when spool 18 was positioned at the middle part of servo valve 17, control valve cut out the oil inlet passage and the oil drain passage of upper cylinder half chamber 13 simultaneously by servo-actuated valve pocket 41.

Two ends of servo-actuated valve pocket 41 have the stagnant oil pocket 77 of buffering of annular respectively, and the stagnant oil pocket 77 of buffering is lateral wall and the valve seat 10 inner chambers institute area surrounded by servo-actuated valve pocket 41 2 ends.The valve seat 10 madial wall places that match with servo-actuated valve pocket 41 are provided with oil-discharging cavity 42 and high-voltage oil cavity 19 from top to bottom successively, high-voltage oil cavity 19 communicates with high-pressure oil passage 15 by at least one the fast fuel feed hole 16 on the oil inlet passage of upper cylinder half chamber 13, oil-discharging cavity 42 communicates with fuel tank 1 by the oil pipe line 68 of the oil drain passage of upper cylinder half chamber 13, the top of servo-actuated valve pocket 41 sidewalls is provided with at least one outage 45 that can be communicated with shoe cream room 46 and valve seat 10 cavity of resorptions, the cavity of resorption of valve seat 10 communicates with upper cylinder half chamber 13, make hydraulic oil in the shoe cream room 46 can flow in valve seat 10 cavity of resorptions freely and in the upper cylinder half chamber 13, the top of valve seat 10 is provided with valve body 9, the bottom of servo valve 17 links to each other with the top of servo-actuated valve pocket 41, pressure-releasing cavity 70 in being provided with successively from bottom to top between the madial wall of the lateral wall of servo valve 17 and valve body 9, actuator chamber 71 and last high pressure oil suction chamber 72, the effective work area that acts on servo valve 17 in the actuator chamber 71 is greater than in the high-voltage oil cavity 19 and act on effective work area sum of servo-actuated valve pocket 41 in valve seat 10 cavity of resorptions, the upper end that is positioned at servo valve 17 in the valve body 9 is provided with pressure-releasing cavity 73, the lower end that is positioned at spool 18 in the servo valve 17 is provided with down pressure-releasing cavity 74, last pressure-releasing cavity 73, following pressure-releasing cavity 74 and middle pressure-releasing cavity 70 communicate with fuel tank 1 by pipeline, last high pressure oil suction chamber 72 communicates with hydraulic power source, pressure-releasing cavity 75 and inner high voltage epicoele 76 in being divided into by the annular shoulder of spool 18 lateral walls successively from bottom to top between the lateral wall of the madial wall of servo valve 17 and spool 18, interior pressure-releasing cavity 75 can communicate with middle pressure-releasing cavity 70 or actuator chamber 71 by oilhole, and inner high voltage epicoele 76 can communicate with last high pressure oil suction chamber 72 or actuator chamber 71 by oilhole.

When work, when touching, needs tup 8 beats soon or energetically fast during strike downwards, can utilize spool control lever 37 that spool 18 is upwards risen to the appropriate location or is promoted to the extreme higher position, at this moment, actuator chamber 71 disconnects with inner high voltage epicoele 76, actuator chamber 71 is simultaneously by oilhole and interior pressure-releasing cavity 75, middle pressure-releasing cavity 70 and fuel tank 1 communicate, thereby cause actuator chamber 71 releases, so, servo valve 17 and servo-actuated valve pocket 41 will move upward under the effect of high-voltage oil cavity 19 inner high voltage oil, make high-voltage oil cavity 19 communicate with upper cylinder half chamber 13 by the cavity of resorption of valve seat 10, hydraulic oil enters in the upper cylinder half chamber 13, the cavity of resorption of valve seat 10 and oil-discharging cavity 42 disconnect simultaneously, because the effective work area of piston 11 in upper cylinder half chamber 13 is greater than its effective work area in following cylinder chamber 14, under the effect of hydraulic oil, piston 11 can move downward fast, is being with tup 8 to hit work done downwards by hammer stem 7.

When needs tup 8 moves upward or move upward fast, can utilize spool control lever 37 that spool 18 is reduced to the appropriate location downwards or is reduced to extreme lower position, at this moment, actuator chamber 71 communicates with inner high voltage epicoele 76 by oilhole, actuator chamber 71 disconnects with interior pressure-releasing cavity 75 simultaneously, inner high voltage epicoele 76 communicates with last high pressure oil suction chamber 72 by oilhole simultaneously, make in the actuator chamber 71 and be in high pressure conditions, because the effective work area that acts on servo valve 17 in the actuator chamber 71 is greater than in the high-voltage oil cavity 19 and act on effective work area sum of servo-actuated valve pocket 41 in valve seat 10 cavity of resorptions, so, servo valve 17 and servo-actuated valve pocket 41 move downward, make the high-voltage oil cavity 19 and the cavity of resorption of valve seat 10 disconnect, the cavity of resorption of valve seat 10 communicates with outage 45 simultaneously, make the cavity of resorption of upper cylinder half chamber 13 through valve seat 10, outage 45, oil pipe line 68 releases of oil-discharging cavity 42 and oil drain passage, under the effect of following cylinder chamber 14 inner high voltage oil, piston 11 can move upward at a slow speed or fast, and piston 11 is being with tup 8 also to move upward by hammer stem 7.

When 8 stop motions of needs tup, can utilize spool control lever 37 that spool 18 is stopped appropriate location to middle zero-bit, at this moment, actuator chamber 71 disconnects with inner high voltage epicoele 76 and interior pressure-releasing cavity 75 simultaneously, so, servo valve 17 stop motions, and this moment, high-voltage oil cavity 19 disconnected with the cavity of resorption of valve seat 10, the cavity of resorption of valve seat 10 and oil-discharging cavity 42 disconnect piston 11 stop motion immediately simultaneously.

Be fixed with cushion dashpot seat 80, cushion dashpot 81, buffering cylinder cap 85 from bottom to top successively above being positioned at piston 11 on the driving cylinder block 12, driving cylinder block 12, cushion dashpot seat 80, cushion dashpot 81, cushioning cylinder cap 85 is integral body of coaxial package.Is furnished with damper piston 84 in the cushion dashpot 81, the inner chamber of damper piston 84 is communicated with upper cylinder half chamber 13, when damper piston 84 is positioned at the below, between damper piston 84, cushion dashpot 81, buffering cylinder cap 85, surround epicoele 82, be processed with at least one through hole 83 between epicoele 82 and the high-pressure oil passage 15.Between damper piston 84 and the buffering cylinder cap 85, between damper piston 84 and the cushion dashpot 81, between damper piston 84 and the cushion dashpot seat 80 V-shaped seal ring is housed all, in case stopping leak dew.Up and absorbed after certain energy by pocketed oil chamber 38 when piston 11, the lower end that piston 11 is run into damper piston 84 again makes on it to be moved, and absorbs energy by high pressure chest 82 again, reaches the efficient buffer purpose.

In order to have better buffering effect, bottom in the upper cylinder half chamber 13 is provided with pocketed oil chamber 38, pocketed oil chamber 38 is madial wall, the bottom of damper piston 84, the top of piston 11 and the axle journal institute area surrounded on piston 11 tops that driven cylinder block 12 by hammer stem, and the axle journal on piston 11 tops can match with the madial wall of damper piston 84 bottoms.When the hammer stem quick return arrives top dead-centre, because hammer stem 7 is driving the tup 8 of big quality, so the inertia that rises is bigger, so the buffer unit on crashproof top must be set.The present invention adopts the principle of pocketed oil chamber 38 and the stagnant oil pocket 77 of buffering, be about to kinetic energy be converted into pressure can mode reach the purpose of hammer stem 7 and servo-actuated valve pocket 41 bufferings, concrete way is to form the axle journal with certain altitude in piston 11 upper ends, the diameter of axle journal is less than piston diameter, form ring-type pocketed oil chamber 38 in damper piston 84 lower ends, when the lower end that hammer stem 7 goes upward to the upper edge of axle journal of piston 11 and pocketed oil chamber 38 overlaps, can form a high pressure pocketed oil chamber 38 of sealing relatively, suddenly the hydraulic oil that raises in the pocketed oil chamber 38 can be extruded along the axle journal of piston 11 and the gap between the valve seat 10, the energy that consumes hammer stem 7 and tup 8 slows down hammer stem 7 and tup 8, finally slowly stops to top dead-centre.For 41 of servo-actuated valve pockets is the stagnant oil pocket 77 of buffering that is respectively equipped with annular at its two end, when servo-actuated valve pocket 41 moves to a certain end, can form a stagnant oil pocket 77 of high-pressure buffer of sealing relatively, the stagnate hydraulic oil that raises suddenly in the oil pocket 77 of buffering can be extruded along the gap of 10 of servo-actuated valve pocket 41 and valve seats, and the energy that consumes servo-actuated valve pocket 41 slows down servo-actuated valve pocket 41 and finally slowly stops.

As shown in Figure 3, hydraulic electrohydraulic hammer of the present invention, the hammer stem that comprises support 39 and vertically be installed in the support 39 drives oil cylinder, the top that hammer stem drives cylinder block 12 is equipped with control valve, control valve shown in Fig. 3 is the state of spool 18 when being in zero-bit, the piston 11 that the upper end of the hammer stem 7 of lower end band tup 8 and hammer stem drive in the cylinder block 12 links to each other, on the piston 11, following two ends have upper cylinder half chamber 13 and following cylinder chamber 14, the effective work area of piston 11 in upper cylinder half chamber 13 is greater than its effective work area in following cylinder chamber 14, following cylinder chamber 14 links to each other with high-pressure oil passage 15 by at least one lower through-hole 22, the quantity of lower through-hole 22 can be 2 or 4 or 6 or 8, high-pressure oil passage 15 is communicated with hydraulic power source by two-position two-way solenoid valve 4, the oil inlet passage of upper cylinder half chamber 13 and oil drain passage communicate with control valve respectively, control valve comprises valve body 9, be provided with servo valve 17 in the valve body 9, be provided with spool 18 in the servo valve 17 slidably, the rear end of spool 18 links to each other with spool control lever 37, when spool 18 is positioned at an end of servo valve 17, control valve connects the oil inlet passage of upper cylinder half chamber 13 and cuts out oil drain passage simultaneously, when spool 18 is positioned at the other end of servo valve 17, control valve cuts out the oil inlet passage of upper cylinder half chamber 13 and connects oil drain passage simultaneously, when spool 18 was positioned at the middle part zero-bit of servo valve 17, control valve cut out the oil inlet passage and the oil drain passage of upper cylinder half chamber 13 simultaneously.

The top that hammer stem drives cylinder block 12 is provided with the execution servo valve, carry out servo valve and comprise the valve seat 10 that is fixed on the hammer stem driving cylinder block 12, the inner chamber of valve seat 10 communicates with upper cylinder half chamber 13, can slide up and down to be provided with servo-actuated valve pocket 41 in the valve seat 10, the bottom of spool 18 links to each other with the top of servo-actuated valve pocket 41, when spool 18 is positioned at the top of servo valve 17 inner chambers, the oil inlet passage that control valve is connected upper cylinder half chamber 13 by servo-actuated valve pocket 41 is closed oil drain passage simultaneously, when spool 18 is positioned at the bottom of servo valve 17 inner chambers, the oil inlet passage that control valve cuts out upper cylinder half chamber 13 by servo-actuated valve pocket 41 is connected oil drain passage simultaneously, when spool 18 was positioned at the middle part of servo valve 17, control valve cut out the oil inlet passage and the oil drain passage of upper cylinder half chamber 13 simultaneously by servo-actuated valve pocket 41.

Two ends of servo-actuated valve pocket 41 have the stagnant oil pocket 77 of buffering of annular respectively, and the stagnant oil pocket 77 of buffering is lateral wall and the valve seat 10 inner chambers institute area surrounded by servo-actuated valve pocket 41 2 ends.The top of valve seat 10 sidewalls that match with servo-actuated valve pocket 41 is provided with unloads oilhole 55, unloading the oil pipe line 68 of oilhole 55 by oil drain passage communicates with fuel tank 1, bottom in the valve seat 10 communicates with the top of upper cylinder half chamber 13, valve seat 10 side-walls that match with servo-actuated valve pocket 41 are provided with control chamber 54 from top to bottom successively, normal low-pressure cavity 53 and high-voltage oil cavity 19, the effective work area of servo-actuated valve pocket 41 in control chamber 54 is greater than its effective work area in high-voltage oil cavity 19, normal low-pressure cavity 53 communicates with fuel tank 1 by pipeline, high-voltage oil cavity 19 communicates with high-pressure oil passage 15 by the fast fuel feed hole 16 on the oil inlet passage of upper cylinder half chamber 13, control chamber 54 communicates with the working hole 67 of control valve by pipeline, be provided with front wheel driving chamber 56 between the madial wall of the lateral wall of servo valve 17 and valve body 9 from bottom to top successively, outer low-pressure cavity 57, outer working chamber 58, outer high pressure chest 59 and rear drive chamber 60, the effective work area of servo valve 17 in front wheel driving chamber 56 is greater than its effective work area in rear drive chamber 60, the lower end that is positioned at servo valve 17 in the valve body 9 is provided with preceding low-pressure cavity 61, the upper end that is positioned at servo valve 17 in the valve body 9 is provided with back low-pressure cavity 66, preceding low-pressure cavity 61, back low-pressure cavity 66 and outer low-pressure cavity 57 communicate with fuel tank 1 by pipeline, outer high pressure chest 59 communicates with high-pressure oil passage 15 by pipeline, inner high voltage chamber 62 before being divided into by the annular shoulder of spool 18 lateral walls successively from bottom to top between the lateral wall of the madial wall of servo valve 17 and spool 18, interior low pressure oil pocket 63, interior working chamber 64 and inner high voltage chamber, back 65, before inner high voltage chamber 62 and back inner high voltage chamber 65 communicate by the connecting hole 48 that passes spool 18, interior low pressure oil pocket 63 communicates with outer low-pressure cavity 57 by oilhole, interior working chamber 64 communicates with outer working chamber 58 by oilhole, working hole 67 communicates with outer working chamber 58, back inner high voltage chamber 65 communicates with outer high pressure chest 59 and rear drive chamber 60 by oilhole respectively, front wheel driving chamber 56 can alternately communicate with preceding inner high voltage chamber 62 or interior low pressure oil pocket 63 respectively by oilhole, outer low-pressure cavity 57 can communicate with outer working chamber 58, and back inner high voltage chamber 65 can communicate with interior working chamber 64.

When work, when touching, needs tup 8 beats soon or energetically fast during strike downwards, can utilize spool control lever 37 that spool 18 is toggled it to the appropriate location backward or dials to the rearmost position, at this moment, preceding inner high voltage chamber 62 communicates with front wheel driving chamber 56 by oilhole, back inner high voltage chamber 65 communicates with rear drive chamber 60 by oilhole, but because the effective work area of servo valve 17 in front wheel driving chamber 56 is greater than its effective work area in rear drive chamber 60, make motion backward under the effect of servo valve 17 oil pressure in front wheel driving chamber 56, so, outer low-pressure cavity 57 communicates with outer working chamber 58, make the oily release in the outer working chamber 58, and make oily release in the control chamber 54 by working hole 67 and pipeline, so, move upward under the effect of servo-actuated valve pocket 41 oil pressure in high-voltage oil cavity 19, bottom and upper cylinder half chamber 13 that order is unloaded in oilhole 55 and the valve seat 10 disconnect, connect with seasonal high-voltage oil cavity 19 and bottom and upper cylinder half chamber 13 in the valve seat 10, hydraulic oil enters in the upper cylinder half chamber 13, because the effective work area of piston 11 in upper cylinder half chamber 13 is greater than its effective work area in following cylinder chamber 14, under the effect of hydraulic oil, piston 11 can move downward fast, is being with tup 8 to hit work done downwards by hammer stem 7.

When needs tup 8 moves upward or move upward fast, can utilize spool control lever 37 that spool 18 is toggled it to the appropriate location forward or dials to the front position, at this moment, front wheel driving chamber 56 disconnects with preceding inner high voltage chamber 62, the chamber 56 of front wheel driving simultaneously communicates with interior low pressure oil pocket 63, make the oily release in the front wheel driving chamber 56, then inner high voltage chamber 65 communicates with rear drive chamber 60 by oilhole, make the oil in the rear drive chamber 60 keep high pressure conditions, so, servo valve 17 travels forward under the effect of oil pressure in rear drive chamber 60, so, back inner high voltage chamber 65 communicates with interior working chamber 64, interior working chamber 64 communicates with outer working chamber 58 again, make the oil in the outer working chamber 58 be in high pressure conditions, and make the high pressure conditions that is in the control chamber 54 by working hole 67 and pipeline, because the moving effective work area of valve pocket 41 in control chamber 54 is greater than its effective work area in high-voltage oil cavity 19, so, move downward under the effect of servo-actuated valve pocket 41 oil pressure in control chamber 54, order is unloaded oilhole 55 and valve seat interior bottom and upper cylinder half chambers 13 10 and is communicated, make oily release in the upper cylinder half chamber 13, disconnect with bottom in seasonal high-voltage oil cavity 19 and the valve seat 10 and upper cylinder half chamber 13, hydraulic oil can't enter in the upper cylinder half chamber 13, because the effective work area of piston 11 in upper cylinder half chamber 13 is greater than its effective work area in following cylinder chamber 14, under the effect of following cylinder chamber 14 inner high voltage oil, piston 11 can move upward at a slow speed or fast, and piston 11 is being with tup 8 also to move upward by hammer stem 7.

When 8 stop motions of needs tup, can utilize spool control lever 37 that spool 18 is stopped appropriate location to middle zero-bit, at this moment, interior working chamber 64 and outer working chamber 58 all disconnect with other chambeies, do not have hydraulic oil to enter or flow out in working chamber 64 and outer working chamber 58, so servo-actuated valve pocket 41 also is in the position that oilhole 55 and high-voltage oil cavity 19 are unloaded in disconnection simultaneously, do not have hydraulic oil to enter or flow out upper cylinder half chamber 13, piston 11 stop motion immediately.

In order to have better buffering effect, bottom in the upper cylinder half chamber 13 has pocketed oil chamber 38, pocketed oil chamber 38 is madial wall, the bottom of damper piston 84, the top of piston 11 and the axle journal institute area surrounded on piston 11 tops that driven cylinder block 12 by hammer stem, and the axle journal on piston 11 tops can match with the madial wall of damper piston 84 bottoms.When the hammer stem quick return arrives top dead-centre, because hammer stem 7 is driving the tup 8 of big quality, so the inertia that rises is bigger, so the buffer unit on crashproof top must be set.The present invention adopts the principle of pocketed oil chamber 38 and the stagnant oil pocket 77 of buffering, be about to kinetic energy be converted into pressure can mode reach the purpose of hammer stem 7 and servo-actuated valve pocket 41 bufferings, concrete way is the axle journal that processes certain altitude in piston 11 upper ends, the diameter of axle journal is less than piston diameter, form pocketed oil chamber 38 in damper piston 84 lower ends, when the lower end that hammer stem 7 goes upward to the upper edge of axle journal of piston 11 and pocketed oil chamber 38 overlaps, can form a high pressure pocketed oil chamber 38 of sealing relatively, suddenly the hydraulic oil that raises in the pocketed oil chamber 38 can be extruded along the axle journal of piston 11 and the gap between the valve seat 10, the energy that consumes hammer stem 7 and tup 8 slows down hammer stem 7 and tup 8, finally slowly stops to top dead-centre.For 41 of servo-actuated valve pockets is the stagnant oil pocket 77 of buffering that is respectively equipped with annular at its two end, when servo-actuated valve pocket 41 moves to a certain end, can form a stagnant oil pocket 77 of high-pressure buffer of sealing relatively, the stagnate hydraulic oil that raises suddenly in the oil pocket 77 of buffering can be extruded along the gap of 10 of servo-actuated valve pocket 41 and valve seats, and the energy that consumes servo-actuated valve pocket 41 slows down servo-actuated valve pocket 41 and finally slowly stops.

The following outside at buffering cylinder cap 85 is provided with chamfering 86, when moving to shutoff through hole 83 on the damper piston 84, forms a high pressure enclosed cavity at chamfering 86 places, absorbs energy once more, further plays cushioning effect.

The hydraulic power source of the various embodiments described above comprises hydraulic pump 2, the inlet of hydraulic pump 2 communicates with fuel tank 1 by the pipeline that is in series with filter, the liquid outlet of hydraulic pump 2 is in parallel with two-position two-way solenoid valve 4 and hydraulic accumulator 5 respectively by the pipeline that is in series with check valve, two-position two-way solenoid valve 4 communicates with high-pressure oil passage 15 by pipeline, the control circuit of two-position two-way solenoid valve 4 is electrically connected with travel switch or near switch 6 and hydraulic pump 2, travel switch or match with hammer stem 7 near the touch device of switch 6, the pipeline place of hydraulic pump 2 liquid outlets is parallel with unloader 3, and the liquid outlet of unloader 3 communicates with fuel tank 1 by pipeline.In use, primer fluid press pump 2, and adjust unloader 3, hydraulic oil will be delivered in the hydraulic accumulator 5 by the road, and simultaneously in two-position two-way solenoid valve 4 is delivered to high-pressure oil passage 15.Because to the forging hammer hammer stem is topmost stressed part, life-span is shorter relatively, in case hammer stem is from middle part fracture and when being in the backhaul attitude, the hydraulic oil that high-pressure oil passage 15 and hydraulic power source provide will vomit from the end opening of high-pressure oil passage 15, might cause fire, cause immeasurable serious consequence.Bi-bit bi-pass reversal valve 4 of often opening so the present invention has connected between high-pressure oil passage 15 and hydraulic accumulator 5, and near the outlet of high-pressure oil passage 15 lower ends installation travel switch or near switch 6.In case hammer stem ruptures from the middle part, travel switch or collect signal near the touch device of switch 6 and signal for immediately the bi-bit bi-pass reversal valve of often opening 4, the bi-bit bi-pass reversal valve of often opening 4 receive travel switch or near the signal of switch 6 after commutate immediately and close down hydraulic pump 2, cut off the path of hydraulic power source and high-pressure oil passage 15, make high-pressure oil passage 15 can not get oil, so hammer stem 7 can stop backhaul immediately, stop the generation of end opening fuel injection event, increased the security of equipment operation greatly.

Claims

1, a kind of electrohydraulic hammer, it comprises support (39), hammer stem fixing in support (39) drives oil cylinder, the hammer stem (7) of hydraulic power source and lower end band tup (8), the upper end of hammer stem (7) drives the interior piston (11) of cylinder block (12) with hammer stem and links to each other, on the piston (11), following two ends have upper cylinder half chamber (13) and following cylinder chamber (14), the effective work area of piston (11) in upper cylinder half chamber (13) is greater than its effective work area in following cylinder chamber (14), following cylinder chamber (14) communicates with high-pressure oil passage (15), high-pressure oil passage (15) communicates with hydraulic power source, it is characterized in that: upper cylinder half chamber (13) communicated with oil inlet passage respectively by the control of control valve or oil drain passage communicates, control valve comprises valve body (9), be provided with servo valve (17) in the valve body (9), be provided with spool (18) in the servo valve (17) slidably, one end of spool (18) links to each other with spool control lever (37), when spool (18) is positioned at an end of servo valve (17), control valve connects the oil inlet passage of upper cylinder half chamber (13) and cuts out oil drain passage simultaneously, when spool (18) is positioned at the other end of servo valve (17), control valve cuts out the oil inlet passage of upper cylinder half chamber (13) and connects oil drain passage simultaneously, when spool (18) is positioned at the middle part of servo valve (17), control valve cuts out the oil inlet passage and the oil drain passage of upper cylinder half chamber (13) simultaneously, be provided with cushion cylinder between hammer stem driving oil cylinder and control valve, the epicoele of cushion cylinder (82) is connected with high-pressure oil passage (15).

2. electrohydraulic hammer according to claim 1, it is characterized in that: between described control valve and cushion cylinder, be provided with the execution servo valve, carry out servo valve and comprise the valve seat (10) that is arranged at hammer stem driving cylinder block (12) top, the inner chamber of valve seat (10) communicates with described upper cylinder half chamber (13), can slide up and down to be provided with servo-actuated valve pocket (41) in the valve seat (10), the bottom of described spool (18) links to each other with the top of servo-actuated valve pocket (41), when spool (18) is positioned at an end of servo valve (17), the oil inlet passage that control valve is connected upper cylinder half chamber (13) by servo-actuated valve pocket (41) is closed oil drain passage simultaneously, when spool (18) is positioned at the other end of servo valve (17), the oil inlet passage that control valve cuts out upper cylinder half chamber (13) by servo-actuated valve pocket (41) is connected oil drain passage simultaneously, when spool (18) was positioned at the middle part of servo valve (17), control valve cut out the oil inlet passage and the oil drain passage of upper cylinder half chamber (13) simultaneously by servo-actuated valve pocket (41).

3. electrohydraulic hammer according to claim 2, it is characterized in that: valve seat (10) the madial wall place that matches with described servo-actuated valve pocket (41) is provided with oil-discharging cavity (42) and high-voltage oil cavity (19) from top to bottom successively, high-voltage oil cavity (19) communicates with described high-pressure oil passage (15) by at least one the fast fuel feed hole (16) on the oil inlet passage of described upper cylinder half chamber (13), described oil-discharging cavity (42) communicates with described fuel tank (1) by the oil pipe line (68) of the oil drain passage of described upper cylinder half chamber (13), the top of described servo-actuated valve pocket (41) sidewall is provided with at least one outage (45) that can be communicated with oil-discharging cavity (42) and valve seat (10) cavity of resorption, the top of servo-actuated valve pocket (41) is provided with at least one oil guiding hole (47) that can be communicated with shoe cream room (46) and valve seat (10) cavity of resorption, the cavity of resorption of valve seat (10) communicates with described upper cylinder half chamber (13), described valve body (9) is positioned at the top of valve seat (10), the bottom of described servo valve (17) links to each other with the top of described servo-actuated valve pocket (41), be provided with pressure-releasing cavity (40) between the madial wall of the lateral wall of servo valve (17) and described valve body (9) from bottom to top successively, following actuator chamber (27), oil back chamber (21), last actuator chamber (28) and outer high pressure oil suction chamber (43), the upper end that is positioned at servo valve (17) in the described valve body (9) is provided with low-pressure cavity (29), the lower end that is positioned at servo valve (17) in the valve body (9) is provided with down low-pressure cavity (30), last low-pressure cavity (29), following low-pressure cavity (30) and pressure-releasing cavity (40) communicate with described fuel tank (1) by pipeline, described high pressure oil suction chamber (43) communicates with described hydraulic power source by oil-in (44), be divided into inner high voltage oil-feed cavity of resorption (32) by the annular shoulder of spool (18) lateral wall successively from bottom to top between the lateral wall of the madial wall of described servo valve (17) and described spool (18), interior low-pressure cavity (51) and inner high voltage oil-feed epicoele (33), inner high voltage oil-feed cavity of resorption (32) can communicate with following actuator chamber (27) by oilhole, inner high voltage oil-feed cavity of resorption (32) communicates by the connecting hole (48) that passes described spool (18) with inner high voltage oil-feed epicoele (33), described inner high voltage oil-feed epicoele (33) communicates with outer high pressure oil suction chamber (43) by the repairing hole, the described actuator chamber (28) of going up communicates with interior low-pressure cavity (51) or described inner high voltage oil-feed epicoele (33) by oilhole, described oil back chamber (21) communicates with interior low-pressure cavity (51) by oilhole, and described actuator chamber (27) down can communicate with interior low-pressure cavity (51) or described inner high voltage oil-feed cavity of resorption (32) by oilhole.

4. electrohydraulic hammer according to claim 2, it is characterized in that: valve seat (10) the madial wall place that matches with described servo-actuated valve pocket (41) is provided with oil-discharging cavity (42) and high-voltage oil cavity (19) from top to bottom successively, high-voltage oil cavity (19) communicates with described high-pressure oil passage (15) by at least one the fast fuel feed hole (16) on the oil inlet passage of described upper cylinder half chamber (13), described oil-discharging cavity (42) communicates with described fuel tank (1) by the oil pipe line (68) of the oil drain passage of described upper cylinder half chamber (13), the top of servo-actuated valve pocket (41) sidewall is provided with at least one outage (45) that can be communicated with shoe cream room (46) and valve seat (10) cavity of resorption, the cavity of resorption of valve seat (10) communicates with described upper cylinder half chamber (13), described valve body (9) is positioned at the top of valve seat (10), the bottom of described servo valve (17) links to each other with the top of described servo-actuated valve pocket (41), be provided with middle pressure-releasing cavity (70) between the madial wall of the lateral wall of servo valve (17) and described valve body (9) from bottom to top successively, actuator chamber (71) and last high pressure oil suction chamber (72), the effective work area that acts on servo valve (17) in the actuator chamber (71) is greater than in the high-voltage oil cavity (19) and act on effective work area sum of described servo-actuated valve pocket (41) in valve seat (10) cavity of resorption, the upper end that is positioned at servo valve (17) in the described valve body (9) is provided with pressure-releasing cavity (73), the lower end that is positioned at described spool (18) in the servo valve (17) is provided with down pressure-releasing cavity (74), last pressure-releasing cavity (73), following pressure-releasing cavity (74) and middle pressure-releasing cavity (70) communicate with described fuel tank (1) by pipeline, the described high pressure oil suction chamber (72) of going up communicates with described hydraulic power source, be divided into interior pressure-releasing cavity (75) and inner high voltage epicoele (76) by the annular shoulder of spool (18) lateral wall successively from bottom to top between the lateral wall of the madial wall of described servo valve (17) and described spool (18), interior pressure-releasing cavity (75) can communicate with described middle pressure-releasing cavity (70) or described actuator chamber (71) by oilhole, and described inner high voltage epicoele (76) can communicate with described upward high pressure oil suction chamber (72) or actuator chamber (71) by oilhole.

5. electrohydraulic hammer according to claim 2, it is characterized in that: the top of valve seat (10) sidewall that matches with described servo-actuated valve pocket (41) is provided with unloads oilhole (55), unloading the oil pipe line (68) of oilhole (55) by described oil drain passage communicates with fuel tank (1), bottom in the described valve seat (10) communicates with the top of described upper cylinder half chamber (13), valve seat (10) side-walls that matches with servo-actuated valve pocket (41) is provided with control chamber (54) from top to bottom successively, normal low-pressure cavity (53) and high-voltage oil cavity (19), the effective work area of servo-actuated valve pocket (41) in control chamber (54) is greater than its effective work area in high-voltage oil cavity (19), normal low-pressure cavity (53) communicates with fuel tank (1) by pipeline, described high-voltage oil cavity (19) communicates with described high-pressure oil passage (15) by the fast fuel feed hole (16) on the oil inlet passage of described upper cylinder half chamber (13), control chamber (54) communicates with the working hole (67) of control valve by pipeline, be provided with front wheel driving chamber (56) between the madial wall of the lateral wall of described servo valve (17) and described valve body (9) from bottom to top successively, outer low-pressure cavity (57), outer working chamber (58), outer high pressure chest (59) and rear drive chamber (60), the effective work area of servo valve (17) in front wheel driving chamber (56) is greater than its effective work area in rear drive chamber (60), the lower end that is positioned at servo valve (17) in the described valve body (9) is provided with preceding low-pressure cavity (61), the upper end that is positioned at servo valve (17) in the valve body (9) is provided with back low-pressure cavity (66), preceding low-pressure cavity (61), back low-pressure cavity (66) and described outer low-pressure cavity (57) communicate with described fuel tank (1) by pipeline, described outer high pressure chest (59) communicates with described high-pressure oil passage (15) by pipeline, inner high voltage chamber (62) before being divided into by the annular shoulder of spool (18) lateral wall successively from bottom to top between the lateral wall of the madial wall of described servo valve (17) and described spool (18), interior low pressure oil pocket (63), interior working chamber (64) and inner high voltage chamber (65), back, preceding inner high voltage chamber (62) communicates by the connecting hole (48) that passes described spool (18) with inner high voltage chamber, back (65), interior low pressure oil pocket (63) communicates with outer low-pressure cavity (57) by oilhole, interior working chamber (64) communicates with outer working chamber (58) by oilhole, described working hole (67) communicates with outer working chamber (58), described inner high voltage chamber, back (65) communicates with described outer high pressure chest (59) and described rear drive chamber (60) by oilhole respectively, described front wheel driving chamber (56) can communicate with described preceding inner high voltage chamber (62) or described interior low pressure oil pocket (63) respectively by oilhole, described outer low-pressure cavity (57) can communicate with described outer working chamber (58), and described inner high voltage chamber, back (65) can communicate with described interior working chamber (64).

6, according to claim 3 or 4 or 5 described electrohydraulic hammers, it is characterized in that: described cushion cylinder structure is: drive at hammer stem and be fixed with cushion dashpot seat (80), cushion dashpot (81), buffering cylinder cap (85) on the cylinder block (12) from bottom to top successively, is furnished with damper piston (84) in the cushion dashpot (81), the inner chamber of damper piston (84) is communicated with upper cylinder half chamber (13), between damper piston (84), cushion dashpot (81), buffering cylinder cap (85), surround epicoele (82), be provided with through hole (83) between epicoele (82) and the high-pressure oil passage (15).

7, electrohydraulic hammer according to claim 6 is characterized in that: the following outside of described buffering cylinder cap (85) is provided with chamfering (86).

8. electrohydraulic hammer according to claim 7, it is characterized in that: the bottom in the described upper cylinder half chamber (13) has pocketed oil chamber (38), pocketed oil chamber (38) is the madial wall that is driven cylinder block (12) by described hammer stem, the bottom of described damper piston (84), the axle journal institute area surrounded on the top of described piston (11) and piston (11) top, the axle journal on piston (11) top can match with the madial wall of damper piston (84) bottom, described high-pressure oil passage (15) is positioned at the support (39) that drives cylinder block (12) sidewall around hammer stem, and the lower through-hole (22) on the described hammer stem driving cylinder block (12) and the quantity of described fast fuel feed hole (16) are 2-8.

9. electrohydraulic hammer according to claim 8, it is characterized in that: described hydraulic power source comprises hydraulic pump (2), the inlet of hydraulic pump (2) communicates with described fuel tank (1) by the pipeline that is in series with filter, the liquid outlet of hydraulic pump (2) is in parallel with two-position two-way solenoid valve (4) and hydraulic accumulator (5) respectively by the pipeline that is in series with check valve, two-position two-way solenoid valve (4) communicates with described high-pressure oil passage (15) by pipeline, the control circuit of two-position two-way solenoid valve (4) is electrically connected with travel switch or near switch (6) and hydraulic pump (2), travel switch or match with described hammer stem (7) near the touch device of switch (6), the pipeline place of hydraulic pump (2) liquid outlet is parallel with unloader (3), and the liquid outlet of unloader (3) communicates with described fuel tank (1) by pipeline.

10. electrohydraulic hammer according to claim 9, it is characterized in that: two ends of described servo-actuated valve pocket (41) have the stagnant oil pocket (77) of buffering of annular respectively, and the stagnant oil pocket (77) of buffering is lateral wall and described valve seat (10) the inner chamber institute area surrounded by described servo-actuated valve pocket (41) two ends.