CN205823794U - There is the lift oil tank of New Buffering structure - Google Patents

Abstract

This utility model discloses a kind of lift oil tank with New Buffering structure, including cylinder body, cylinder body is respectively arranged at two ends with fairlead and cylinder bottom, cylinder bottom is provided with oilhole, piston rod is had in cylinder body, piston-rod lower end is provided with piston, cushion collar is had in the central through hole of piston, the cross section of described cushion collar is regular hexagon, there is elastic spring to fix between cushion collar and piston inner wall, have six arcuate gap between cushion collar and piston inner wall, in the centre bore of cylinder bottom, be provided with buffering axle sleeve, buffering axle sleeve one end is stretched in the central through hole of cushion collar, has gap with buffering inner room.This utility model, by cushion collar is arranged to regular hexagon, increases logical oil sectional area, reaches the purpose of working stability, good buffer effect, effectively overcomes the defect of the buffering effect difference that existing lift oil tank exists.

Description

There is the lift oil tank of New Buffering structure

Technical field

This utility model relates to a kind of lift oil tank, a kind of apply in fork truck basic model door frame oil cylinder have The lift oil tank of New Buffering structure.

Background technology

At present, fork truck lifting oil cylinder is of a great variety, has piston cylinder, also has plunger case.Oil cylinder during hoisting, piston Cylinder only has rodless cavity to have fluid, rod chamber not to have pressure, it is impossible to play buffering effect.And the rodless cavity of plunger case and rod chamber are all Having fluid, during hoisting, rod chamber also can give one downward pressure of plunger, thus plays cushioning effect when rising.Existing The structure of plunger case is as it is shown in figure 1, include cylinder barrel 102, and cylinder barrel 102 is respectively arranged at two ends with fairlead 101 and cylinder bottom 104, cylinder barrel There is plunger rod 110 in 102, plunger rod 110 has plunger 107, between plunger 107 and cylinder barrel 102 inwall, has support ring 103, plunger Buffering axle sleeve 109, buffering axle sleeve 109 is had to be connected with piston rod 110 inwall by elastic spring 108 in the centre bore of bar 110, buffering First oil-through hole the 111, second oil-through hole 112 and the 3rd that internal diameter increases successively is from top to bottom had the most oily on axle sleeve 109 Hole 113, buffering axle sleeve 109 is cased with copper sheathing 106, buffering axle sleeve 109 is also cased with spring 105, and spring 105 two ends are against respectively On cylinder bottom 104 and plunger rod 110.When oil cylinder declines, when plunger rod 110 drops to close to cylinder bottom 104, copper sheathing 106 keeps off successively Live the first oil-through hole 113 and the second oil-through hole 112, only remain the 3rd oil-through hole 111 for oil return, thus reach cushioning effect；Oil When cylinder rises, when plunger rod 110 leaves cylinder bottom 104, buffering axle sleeve 109 is flicked by spring 105, and such oil cylinder is declining again To realizing lower buffering during cylinder bottom 104, play repeated action.The plunger case volume of this structure is relatively big, it is loaded down with trivial details to assemble, and buffers axle sleeve 109 coordinate facial plane degree requirement to compare high with cylinder bottom 104, and support ring 103 compares tight with the clearance control of cylinder barrel 102 inwall Lattice, cause leakage of oil point more, largely effect on the effect declining buffering.

Utility model content

In order to solve the problem that prior art exists, this utility model provides a kind of oil that hoists with New Buffering structure Cylinder, this oil cylinder, by cushion collar is arranged to hexagon, increases logical oil sectional area, reaches working stability, good buffer effect Purpose, effectively overcomes the defect of the buffering effect difference that existing lift oil tank exists.

This utility model adopts the following technical scheme that the lift oil tank with New Buffering structure, including cylinder body, cylinder body two End is respectively equipped with fairlead and cylinder bottom, and cylinder bottom is provided with oilhole, has piston rod, piston-rod lower end to be provided with piston, piston in cylinder body Central through hole in have cushion collar, the cross section of described cushion collar be regular hexagon, have steel wire between cushion collar and piston inner wall Back-up ring is fixed, and has gap between cushion collar and piston inner wall, is provided with buffering axle sleeve in the centre bore of cylinder bottom, and buffering axle sleeve one end is stretched into In the central through hole of cushion collar, there is gap with buffering inner room.

The operation principle of the lift oil tank with New Buffering structure of the present utility model is: when oil cylinder hoists, hydraulic pressure Oil enters the centre bore of buffering axle sleeve from the oilhole of cylinder bottom, then enters buffering from the gap between buffering axle sleeve top and piston In gap between axle sleeve and cushion collar and between cushion collar and piston inner wall, and eventually enter between piston and cylinder bottom, promote Piston hoists, and owing to the cross section of cushion collar is regular hexagon, has a segment distance between each of cushion collar and piston inner wall Being available for hydraulic oil to pass through, increase logical oil sectional area, hydraulic oil circulates smoothly, and not only lifting velocity is fast, moreover it is possible to avoid the occurrence of Oil cylinder occurs the situation of vibrations during hoisting；When oil cylinder falls after rise, the hydraulic oil between cylinder bottom and piston again can be from buffer shaft The centre bore of set enters the centre bore of cylinder bottom, and then is discharged by the oilhole of cylinder bottom, when oil cylinder drops to relief area (i.e. cushion collar Drop to and contact with buffer shaft set) time, the logical pasta of hydraulic oil is long-pending to be reduced rapidly, and hydraulic oil needs again from buffering axle sleeve and buffering Gap oil return between set and between cushion collar and piston inner wall, now, due between each of cushion collar and piston inner wall There is distance, can effectively increase logical pasta and amass, the oil cylinder vibrations that relieving hydraulic oil flow causes more greatly, reach to hoist, fall after rise steadily Purpose.

There is Glais ring to seal between piston and inboard wall of cylinder block, the outer peripheral face of piston has support ring to coordinate with cylinder body.Under oil cylinder When dropping to relief area, reducing rapidly owing to logical pasta is long-pending, hydraulic fluid pressure moment increases, and Glais ring and support ring can effectively hinder Only hydraulic oil is by entering in rod chamber between piston and inboard wall of cylinder block, improves the buffering effect of piston cylinder.

It is additionally provided with check valve in piston, between check valve and cushion collar, has pad to isolate.Owing to rod chamber is closed chamber, with Hoisting of oil cylinder, in rod chamber, gas pressure increases, and can apply a downward pressure to piston, and that reduces oil cylinder plays raising speed Degree, the effect of check valve is when in rod chamber, pressure is excessive, and check valve is opened, and by check valve pressure release, reduces in rod chamber Gas pressure, improves oil cylinder lifting velocity.

In sum, the lift oil tank with New Buffering structure of the present utility model increases by increasing logical oil sectional area The flow velocity of hydraulic oil, prevent oil cylinder from occurring the situation of vibrations during hoisting and declining, it is ensured that oil cylinder hoists and declines Stationarity.The setting of check valve can also be effectively improved the lifting velocity of oil cylinder on the basis of ensureing oil cylinder stationarity.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of existing ram cylinder.

Fig. 2 is the schematic diagram that this utility model has the lift oil tank of New Buffering structure.

Fig. 3 is the structural representation that this utility model has the cushion collar of the lift oil tank of New Buffering structure.

Detailed description of the invention

Below in conjunction with the accompanying drawings embodiment of the present utility model is described specifically:

Having the lift oil tank of New Buffering structure, as in figure 2 it is shown, include cylinder body 207, screw thread is passed through on cylinder body 207 top Connect and have fairlead 203, fairlead 203 outer peripheral face of thread portions is provided with sealing ring 205 and coordinates with cylinder body 207, cylinder body 207 lower weld have cylinder bottom 213, cylinder bottom 213 have oilhole 212, oilhole 212 communicate with the centre bore of cylinder bottom 213；

Also include that a piston rod 206, piston rod 206 penetrate in the middle through-hole by fairlead 203 in cylinder body 207, Fairlead 203 is from top to bottom sequentially provided with dust ring 201, primary seal circle 202 and steel-backed bearing with coordinating of piston rod 206 on face 204 for dust-proof, seal and guide, piston rod 206 lower end is provided with piston 217, and piston 217 rivets with piston rod 206, piston The outer peripheral face of 217 is provided with support ring 215 and coordinates with cylinder body 207, has Glais ring 216 to seal between piston 217 and cylinder body 207 inwall, It is possible to prevent that the fluid stress of rodless cavity is excessive to be returned in rod chamber by cylinder body 207 inwall, has in the central through hole of piston 217 Cushion collar 210, the cross section of cushion collar 210 is positive six deformation, as it is shown on figure 3, have steel between cushion collar 210 and piston 217 inwall Silk back-up ring 214 is fixed, and has the gap of arch, the center of cylinder bottom 213 between six faces of cushion collar 210 and the inwall of piston 217 Being provided with buffering axle sleeve 211 in hole, buffering axle sleeve 211 one end is stretched in the central through hole of cushion collar 210, and is had between cushion collar 210 Gap；

Check valve 208, check valve 208 is also had to be used for as rod chamber pressure release, reduction rod chamber gas in the centre bore of piston 217 Body pressure, has pad 209 to isolate between check valve 208 and cushion collar 210, pad 209 and cushion collar 209 and buffering axle sleeve 211 Between have gap.

During oil cylinder hoists, fluid enters the centre bore of cylinder bottom 213 from the oilhole 212 of cylinder bottom 213, buffered axle sleeve The centre bore of 211 enters the gap between buffering axle sleeve 211 and pad 209 and cushion collar 210 and pad 209, the most buffered Gap between set 210 and piston 217 and cushion collar 210 and buffering axle sleeve 211 flows between piston 217 and cylinder bottom 213, along with Oil liquid pressure between piston 217 and cylinder bottom 213 increases, and promotes oil cylinder to hoist, owing to the cross section of cushion collar 210 is positive six limits Shape, has the gap of arch to be available for fluid between six faces of cushion collar 210 and piston 217 inwall and passes through, and increases logical oil cross section Long-pending, make fluid circulation more smooth and easy, not only lifting velocity is fast, moreover it is possible to avoids the occurrence of oil cylinder and occurs the feelings of vibrations during hoisting Condition；And owing to rod chamber is closed chamber, along with hoisting of oil cylinder, gas pressure increases in rod chamber, apply to piston 217 One downward pressure, reduces the lifting velocity of oil cylinder, and the effect of check valve 208 is pressure release, reduces gas pressure in rod chamber, Improve oil cylinder lifting velocity.When oil cylinder falls after rise, the fluid between cylinder bottom 213 and piston 217 again can be from the center of buffering axle sleeve 211 Hole enters in the centre bore of cylinder bottom 213, then discharges from the oilhole 212 of cylinder bottom 213, (i.e. buffers when oil cylinder drops to relief area Set 210 drop to contact with buffering axle sleeve 211) time, the logical pasta of fluid is long-pending to be reduced rapidly, and fluid needs again from buffering axle sleeve Gap oil return between 211 and cushion collar 210 and between cushion collar 210 and piston 217 inwall, now, due to cushion collar 210 There is arcuate gap between six faces and piston 217 inwall, effectively increase logical pasta and amass, alleviate the oil cylinder that fluid flow causes more greatly Vibrations, reach to hoist, fall stable purpose after rise.

Above-described is only a kind of embodiment of the present utility model.It should be pointed out that, the ordinary skill for this area For personnel, on the premise of without departing from this utility model principle, it is also possible to make some modification and improvement, these also should be regarded as Belong to protection domain of the present utility model.

Claims (3)

1. having the lift oil tank of New Buffering structure, including cylinder body, cylinder body is respectively arranged at two ends with fairlead and cylinder bottom, on cylinder bottom Be provided with oilhole, in cylinder body, have piston rod, piston-rod lower end to be provided with piston, in the central through hole of piston, have a cushion collar, cushion collar with There is elastic spring to fix between piston inner wall, between cushion collar and piston inner wall, have gap, in the centre bore of cylinder bottom, be provided with buffering axle sleeve, Buffering axle sleeve one end is stretched in the central through hole of cushion collar, has gap with buffering inner room, it is characterised in that: described cushion collar Cross section is regular hexagon.

The lift oil tank with New Buffering structure the most according to claim 1, it is characterised in that: piston and inboard wall of cylinder block Between have Glais ring to seal, the outer peripheral face of piston has support ring to coordinate with cylinder body.

The lift oil tank with New Buffering structure the most according to claim 1 and 2, it is characterised in that: also set in piston There is check valve, between check valve and cushion collar, have pad to isolate.