[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

EP0457251A1 - Verbesserungen bei der Herstellung von hydraulischen Hämmern - Google Patents

Verbesserungen bei der Herstellung von hydraulischen Hämmern Download PDF

Info

Publication number
EP0457251A1
EP0457251A1 EP91107738A EP91107738A EP0457251A1 EP 0457251 A1 EP0457251 A1 EP 0457251A1 EP 91107738 A EP91107738 A EP 91107738A EP 91107738 A EP91107738 A EP 91107738A EP 0457251 A1 EP0457251 A1 EP 0457251A1
Authority
EP
European Patent Office
Prior art keywords
valve
hammer
pressure
hydraulic
manufacture
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP91107738A
Other languages
English (en)
French (fr)
Inventor
Marcelino Tapias Puig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0457251A1 publication Critical patent/EP0457251A1/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/14—Control devices for the reciprocating piston
    • B25D9/145—Control devices for the reciprocating piston for hydraulically actuated hammers having an accumulator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/14—Control devices for the reciprocating piston
    • B25D9/16—Valve arrangements therefor
    • B25D9/20—Valve arrangements therefor involving a tubular-type slide valve
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2209/00—Details of portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D2209/002—Pressure accumulators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2209/00—Details of portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D2209/007—Details of portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously having a tubular-slide valve, which is not coaxial with the piston

Definitions

  • This present invention Patent discloses improvements to the manufacture of hydraulic hammers of the type used in Public Works or similar uses where the object is to break up rocks or hard areas of terrain with a view to subsequent Civil construction.
  • Hydraulic hammers comprise mechanisms which fundamentally consist of a cylinder and piston assembly fed by an hydraulic fluid under high pressure communicating alternately by means of a system of slide valves with one or other side of the piston, causing a percussion movement, or in other words an active impulse on the piston crown and its return movement.
  • the kinetic energy of the reciprocal return movement in each cycle is absorbed by springs.
  • Improvements in efficiency of hydraulic hammers can be obtained by increasing the rate of percussion in a unit time of operation in working on the terrain in question and also by maintaining a high value of the kinetic energy in the hammer blow on the target spot being worked.
  • the improvements object of this Patent are designed precisely to achieve a much higher rate of operation of the hydraulic hammer and at the same time to provide characteristics yielding an accumulation of pressure which is obtained by means of a gaseous device of considerable effectiveness and novelty.
  • the improvements object of this patent are based on a design of hydraulic hammer using a cylinder and piston system where the piston stroke is controlled by a slide valve having specific characteristics and such that the entire mobile assembly is acting against a gaseous buffer through an intermediate mass of hydraulic fluid which itself provides refrigeration of the cylinder of the pressure accumulator. This permits operation at high pressures, the high level of heat being evacuated in the cooling hydraulic fluid.
  • a control and non-return system of valves completes the functional cycle of the hydraulic hammer.
  • these improvements are based on the provision of the high pressure accumulator and hollow piston with a compensated and cooled pressure chamber, with inlet fluid control and pressure valve without membranes but having a high degree of sealing, energy recovery from the piston rebound effect or that of the mobile assembly in the hammer from its striking the breaker tool, this being obtained by the retention of a minimum constant pressure in the interior of the pressure chamber, limiting the rebound and increasing the contact time between the piston and the breaker tool, considerably increasing the impact and the paving breakage effect.
  • Figure 1 shows in longitudinal section an hydraulic hammer embodying the improvements disclosed in this patent.
  • Figure 2 is a detail in section of the part corresponding to the valve system and the gas pressure accumulator.
  • Figure 3 is a section in detail of the lower part of the hammer in which the mobile piston makes contact with the mobile punch of the hammer.
  • Figure 4 is a view of the control valve systems incorporating the improvements.
  • the improvements object of this patent comprise the construction of the hydraulic hammer consisting of a monoblock -1- with internal replaceable sleeves -2- within which the mobile assembly or piston -3- moves, this latter having a sealing zone or head -4- of a slightly larger diameter with a multiplicity of sealing ring grooves -5-.
  • This mobile assembly makes contact at its lower end with the extremity of the striker punch -6- and at the other end, through a mass of hydraulic fluid filling the chamber -7-, transmits its kinetic energy, receiving the opposed force of a gas pressure accumulator, consisting of the chamber -8- enclosed by the high strength external cylinder -9- and the welded upper capping -10-within which can move a hollow piston -11- which is able to transmit and receive the compressive action of the gas held in the said chamber -8-.
  • a slide valve -12- housed in the lateral manifold -13- determines the charge and discharge cycle to one or other of the two faces of the mobile assembly -3- and this permits, jointly with the operation of the pressure accumulator the repeated high speed work cycle of the hammer.
  • the manifold communicates with the cylinder -3- through passages -14-, -15 and -16-.
  • Another lateral body -17- contains the inlet and outlet control valves governing also the maintenance of pressure in the chamber -7-, intermediate between the mobile assembly and the pressure accumulator.
  • the slide valve -12- is hollow having an axial bore -18- with a widening of the diameter at the lower end -19-, another at the upper end -20- and a third, less wide -21- at an intermediate level.
  • An hydraulic damper or buffer zone -22- is shown schematically by dotted lines and is designed to act on the mobile body of the slide valve at the extremity corresponding to the widening -20-.
  • the upper chamber -22- communicates directly with the channel -14- and the body -13- in the interior of which valve -12- can move, the valve body periphery having recesses -24-. -25-, -26-, intercommunicating, and which in conjunction with the external profiles on the valve and the said communicating passages provide the means of inlet and discharge of fluid to the main cylinder through the intermediate channelling presented by the peripheral recesses -27-, communicating with the lower passage -16-; -28-, communicating with the intermediate passage -15-, and -29- which communicates with the upper passage -14-, with the recess -30-, which is in communication with the recessed zone -28-.
  • valve block -17- containing three valves -31-, -32-, and -33-, interconnected as can be seen in the drawings - the valve -31- regulating the pressure in both directions to a value of approximately 20 bars, with valve -32- being a high precision controlled non - return valve with valve -33- being a discharge control and relief valve.
  • Valve -31- receives the pressure directly of the fluid at entry to the hammer from the hydraulic pump feeding the hammer and regulates the pressure to a predetermined level, normally some 20 bars as well as the flow required to the pressure chamber, this, without altering the pressure or the flow in the main circuit.
  • Valve -32- closes off the pressure to the valve -31- when the accumulated pressure discharges to the pressure accumulator in the interior of the chamber and there is an excess of pressure above the set level of the feed valve -31-.
  • the pre-set valve -33- controls the pressure required at the pressure chamber during discharge of the pressure built up in the pressure accumulator, thus ensuring the precise and constant pressure differential between maximum and minimum levels in the interior of the chamber and controlling the circulation of the hydraulic fluid which cools the pressure chamber. It acts as a relief safety valve in the case of an excess pressure.
  • a main channel -34- feeds through passage -35- to the cylinder -36-in which the valve -31- operates, this valve communicating with the inclined passage -37- through to an axial passage or collector -38- which is in communication with the hammer body through another longitudinal passage -39-.
  • Valves -31- and -32- are interconnected by the passage -40-.
  • the longitudinal channel or collector -39- is in communication radially on different planes, as may be seen, through the radial channels -41-, -42-, -43- and -44-.
  • the hammer incorporating the improvements herein described is put into operation by exerting a slight pressure on the breaker tool or bit, thus causing the opening of access of fluid to the control valve when the mobile assembly referred to above is in a position open to the lower part of the piston, forcing it to the top of its stroke where the pressure chamber is situated and which maintains a controlled constant pressure in which the hammer piston is inserted and which on being under the pressure of the hydraulic fluid advances to within the chamber forcing the fluid therein to the upper part where the piston pressure accumulator is located, this causing a multiplying effect on the pressure due to the ratio of the areas of the pressure surfaces of the hammer piston and the accumulator.
  • This differential being approximately 1:5 resulting in that between the pressure chamber and the piston accumulator some 500 cm3 of hydraulic fluid are retained.
  • the pressure can be easily regulated by means of controlling the pressure of nitrogen in the accumulator chamber over a wide range of operating requirements depending on the type of surface that the hammer has to cope with.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP91107738A 1990-05-14 1991-05-13 Verbesserungen bei der Herstellung von hydraulischen Hämmern Withdrawn EP0457251A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES9001334 1990-05-14
ES9001334A ES2024251A6 (es) 1990-05-14 1990-05-14 Perfeccionamientos en la fabricacion de martillos hidraulicos.

Publications (1)

Publication Number Publication Date
EP0457251A1 true EP0457251A1 (de) 1991-11-21

Family

ID=8267277

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91107738A Withdrawn EP0457251A1 (de) 1990-05-14 1991-05-13 Verbesserungen bei der Herstellung von hydraulischen Hämmern

Country Status (2)

Country Link
EP (1) EP0457251A1 (de)
ES (1) ES2024251A6 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0527395A2 (de) * 1991-08-08 1993-02-17 Maruzen Kogyo Company Limited Hydraulischer Schlaghammer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2065806B1 (es) * 1992-03-11 1997-07-01 Tapias Puig Marcelino Mejoras introducidas en martillos hidraulicos.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3741316A (en) * 1968-01-16 1973-06-26 Forges Et Atellers De Meudon S Fluid operated percussion tool
US3774502A (en) * 1971-05-14 1973-11-27 Krupp Gmbh Hydraulic percussion device with pressure-responsive control of impact frequency
FR2248122A1 (de) * 1973-10-23 1975-05-16 Svenska Hymas Ab
EP0256955A1 (de) * 1986-08-07 1988-02-24 Etablissements Montabert Verfahren und Vorrichtung zum Einstellen der Schlagparameter des Schlagkolbens einer von einem nicht zusammendrückbaren Fluid angetriebenen Vorrichtung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3741316A (en) * 1968-01-16 1973-06-26 Forges Et Atellers De Meudon S Fluid operated percussion tool
US3774502A (en) * 1971-05-14 1973-11-27 Krupp Gmbh Hydraulic percussion device with pressure-responsive control of impact frequency
FR2248122A1 (de) * 1973-10-23 1975-05-16 Svenska Hymas Ab
EP0256955A1 (de) * 1986-08-07 1988-02-24 Etablissements Montabert Verfahren und Vorrichtung zum Einstellen der Schlagparameter des Schlagkolbens einer von einem nicht zusammendrückbaren Fluid angetriebenen Vorrichtung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0527395A2 (de) * 1991-08-08 1993-02-17 Maruzen Kogyo Company Limited Hydraulischer Schlaghammer
EP0527395A3 (de) * 1991-08-08 1994-01-26 Maruzen Kogyo Co Ltd

Also Published As

Publication number Publication date
ES2024251A6 (es) 1992-02-16

Similar Documents

Publication Publication Date Title
US4283991A (en) Percussion mechanism
CA1092941A (en) Hydraulic impact device
US4062268A (en) Fluid operable hammer
US4006665A (en) Percussion tool
US4479551A (en) Actuator for a hydraulic impact device
EP0457251A1 (de) Verbesserungen bei der Herstellung von hydraulischen Hämmern
US4142447A (en) Hydraulic actuator
US4012909A (en) Hammer
EP0477067B1 (de) Hochleistungsfähiger pneumatischer Schlagmechanismus mit Kolbenventil
CA1106249A (en) Hammer
JPH01501607A (ja) 単動空気圧衝撃工具
US4248133A (en) Impact mechanism
US9701002B2 (en) Hammering device
US9724813B2 (en) Device for rock and-concrete machining
US20040050243A1 (en) Percussion hydraulic apparatus
RU2244828C1 (ru) Пневматический молоток
CN110439455B (zh) 一种凿岩设备的工作装置
SU1044058A1 (ru) Гидропневматическое ударное устройство
SU1257202A1 (ru) Устройство ударного действи
RU2138635C1 (ru) Гидравлический ударный привод
RU2104148C1 (ru) Гидравлический молот (варианты)
EP1058600B1 (de) Druckflüssigkeitsbetriebenes werkzeug
SU775307A2 (ru) Гидропневматическое устройство ударного действи
RU2258138C1 (ru) Устройство ударного действия
RU2018654C1 (ru) Устройство ударного действия

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE ES FR GB IT LI NL SE

17P Request for examination filed

Effective date: 19920406

17Q First examination report despatched

Effective date: 19920626

111L Licence recorded

Free format text: 0100 MARTILLOS HIDRAULICOS S.A.

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19921107