CN201411355Y

CN201411355Y - Safety buffering device of forklift truck gantry

Info

Publication number: CN201411355Y
Application number: CN 200920121289
Authority: CN
Inventors: 吕元
Original assignee: Zhejiang Maximal Forklift Co Ltd
Current assignee: Haist Mei Kos forklift truck (Zhejiang) Co., Ltd.
Priority date: 2009-06-04
Filing date: 2009-06-04
Publication date: 2010-02-24
Anticipated expiration: 2019-06-04

Abstract

The utility model relates to a forklift truck, in particular to a forklift truck gantry. A safety buffering device of the forklift truck gantry comprises a cylinder seat, a cylinder body, a piston, apush rod, an oil storage chamber, an oil receiving chamber, an oil inlet opening and an oil outlet opening. The cylinder seat and the cylinder body are combined into an oil cylinder outer casing, thepiston slides on the inner wall of the cylinder body through pushing and pulling of the push rod, the oil storage chamber is arranged as a cavity portion inside the cylinder body, the oil receiving chamber is arranged as a cavity portion inside the cylinder seat, the oil storage chamber is communicated with the oil receiving chamber, the oil inlet opening and the oil outlet opening are disposed onthe cylinder seat and communicated with the oil receiving chamber, a piston chamber communicated with the oil storage chamber is arranged inside the piston, and a step is disposed on the inner wall of the piston chamber, thereby forming a comparatively large inner diameter of one portion of the piston chamber which is inside the piston and approaches the oil storage chamber and a comparatively small inner diameter of one portion of the piston chamber far away from the oil storage chamber. Consequently, the piston portion with a comparatively small inner diameter forms an oil injection chamber, and a restrictive ring is arranged on the portion with a comparatively large inner diameter inside the piston chamber. According to the technical scheme, the forklift truck gantry can not only prevent the oil cylinder from descending in excessive high speed so as to produce hitting noise, but also enable the forklift truck to be operated more steadily.

Description

The safety buffer device of forklift door frame

Technical field

The utility model relates to fork truck, relates in particular to forklift door frame.

Background technology

At present, forklift door frame generally all adopts the mode of hydraulic pressure as dynamical element, in the process of forklift door frame up-and-down movement, just need finish, when door frame need rise, just piston be boosted by hydraulic oil by the crank motion of hydraulic ram inner carrier, door frame just moves up, when door frame need descend, just piston to be left behind by hydraulic oil, door frame just moves down.Existing fork truck does not have shock absorber at fork truck oil cylinder cylinder bottom place, when door frame descends, tend to cause because of excessive velocities strike note, and the fork truck traveling comfort can be affected also.

People have designed a kind of shock absorber of forklift door frame oil cylinder, as Heli Co., Ltd., Anhui on February 26th, 2003 application, on January 18th, 2006 was announced, application number is 03220124.9, notification number is the utility model of CN2752236, name is called fork truck lift oil tank cylinder bottom shock absorber, this utility model relates to fork truck and plays oil cylinder, fork truck lift oil tank cylinder bottom shock absorber specifically, in the oilhole at lift oil tank cylinder bottom 2 middle parts, install and comprise spool 3, valve pocket 4, the shock absorber of spring 5 and valve seat 6, have additional shock absorber at fork truck lift oil tank cylinder bottom and can obviously eliminate impact, eliminate the cylinder bottom impact noise, this utility model is reasonable in design, and is simple in structure, and do not need to change the structure of existing fork truck lift oil tank.Though the shock absorber of this fork truck oil cylinder has played minimizing fork truck noise to a certain extent, has made buffer actions such as fork truck operates steadily, but it is to use spring as shock absorber, under the big situation of the such work capacity of forklift door frame, use, spring is through after repeatedly big load uses, and tends to lose efficacy and do not have effect.

Summary of the invention

The utility model is big at noise in the prior art, operation not steadily, the deficiency that easily lost efficacy, provide a kind of and can keep away the oil cylinder impact noise, also can allow the safety buffer device of the more stable forklift door frame of fork truck operation.

In order to solve the problems of the technologies described above, the utility model is solved by following technical proposals:

The safety buffer device of forklift door frame, comprise the cylinder seat, cylinder body, piston, push rod, oil cabinet, receive grease chamber and oil inlet and outlet, cylinder seat and cylinder body are combined into cylinder shell, piston slides on the inwall of cylinder body by the push-and-pull of push rod, oil cabinet is a cylinder interior cavity part, receiving the grease chamber is cylinder seat inner cavity part, oil cabinet communicates with the receipts grease chamber, oil inlet and outlet is opened on the cylinder seat and with the receipts grease chamber and is communicated, internal piston has the plunger shaft that communicates with oil cabinet, the plunger shaft inwall has a step, it is bigger apart from the near a part of internal diameter of oil cabinet to form the internal piston plunger shaft therefrom, smaller apart from a part of internal diameter that oil cabinet is far away, the plunger shaft of internal diameter smaller portions forms the oil spout chamber, internal diameter major part plunger shaft is built-in with block ring, has the gear ring to be installed in the position that is used to limit block ring on the piston, is connected the oil pipe that communicates with the receipts grease chamber on the cylinder seat and extend in the block ring.

Oil pipe separates oil cabinet mutually with the receipts grease chamber, hydraulic oil just needs through the oil spout chamber when flowing into the receipts grease chamber by oil cabinet like this, so just, the bump that causes piston rotation perdurability to cause soon because hydraulic oil flows out excessive velocities can be avoided, thereby the plateau of fork truck operation can be guaranteed more.

As preferably, the internal diameter of block ring is greater than the external diameter of oil pipe, and oil cabinet communicates with the oil spout chamber with slit and slit between piston and the oil pipe by block ring, the oil spout chamber by oil pipe with receive the grease chamber and communicate.

Hydraulic oil in the oil cabinet enters the oil spout chamber by the slit between oil pipe and the piston, block ring is installed in the place, slit, the inside/outside diameter size that can adjust block ring changes the hydraulic oil flow velocity, hydraulic oil in the oil cabinet can be squeezed into the oil spout chamber and then enter receives the grease chamber, because the slit between piston and the oil pipe, the flow velocity of hydraulic oil just can descend and its effect to buffering, simultaneously owing in the plunger shaft step is arranged, oil pipe may be stuck in the step place when entering, block ring also can play the effect of correct guiding oil pipe.

According to the technical solution of the utility model, the flow velocity of hydraulic oil can reduce when hydraulic ram is worked, and can avoid the oil cylinder too fast strike note that causes that descends like this, also can allow the more stable of forklift operator.

Description of drawings

Fig. 1 is the safety buffer device scheme drawing of forklift door frame.

The toponym that each number designation referred in the above accompanying drawing is as follows:

1-push rod, 2-piston, 3-block ring, 4-gear ring, 5-oil pipe, 6-cylinder seat, 7-oil inlet and outlet, 8-oil cabinet, 9-cylinder body, 21-plunger shaft, 22-slit, 23-slit, 81-receive grease chamber, 211-oil spout chamber, 212-step.

The specific embodiment

Below in conjunction with the accompanying drawing 1 and the specific embodiment the utility model is described in further detail:

Embodiment, with reference to the accompanying drawings 1, the safety buffer device of forklift door frame, comprise cylinder seat 6, cylinder body 9, piston 2, push rod 1, oil cabinet 8, receive grease chamber 81 and oil inlet and outlet 7, cylinder seat 6 is combined into cylinder shell with cylinder body 9, piston 2 slides on the inwall of cylinder body 9 by the push-and-pull of push rod 1, oil cabinet 8 is cylinder body 9 inner cavity part, receiving grease chamber 81 is cylinder seat 6 inner cavity part, oil cabinet 8 communicates with receipts grease chamber 81, oil inlet and outlet 7 is opened on cylinder seat 6 and with receipts grease chamber 81 and is communicated, piston 2 inside have the plunger shaft 21 that communicates with oil cabinet 8, plunger shaft 21 inwalls have a step 212, and it is bigger apart from the near a part of internal diameter of oil cabinet 8 to form piston 2 internal piston chambeies 21 therefrom, and are smaller apart from a part of internal diameter that oil cabinet 8 is far away, the plunger shaft 21 of internal diameter smaller portions forms oil spout chamber 211, internal diameter major part plunger shaft 21 is built-in with block ring 3, has gear ring 4 to be installed in the position that is used to limit block ring 3 on the piston 2, is connected the oil pipe 5 that communicates with receipts grease chamber 81 on the cylinder seat 6 and extend in the block ring 3.The internal diameter of block ring 3 is greater than the external diameter of oil pipe 5, and oil cabinet 8 communicates with oil spout chamber 21 with slit 22 and slit 23 between piston 2 and the oil pipe 5 by block ring 3, oil spout chamber 21 by oil pipe 5 with receive grease chamber 81 and communicate.

In the process that door frame descends, hydraulic oil is sucked out from oil inlet and outlet 7, when piston 2 drops to when contacting with oil pipe 5, oil pipe 5 enters in the block ring 3, begin buffering course this moment, hydraulic oil needs just can enter in the receipts grease chamber 81 through oil spout chamber 211 from oil cabinet 8, slit 22 and slit 23 are arranged between block ring 3 and piston 2 and the oil pipe 5, hydraulic oil flow velocity from oil cabinet inflow oil spout chambers 211 8 time just can descend, hydraulic oil outflow speed descends, and piston 2 descending speeds also decrease, and then reach buffer action, the strike note of having avoided piston 2 to descend bump cylinder seat 6 rapidly and having produced has also guaranteed the fork truck traveling comfort.

In a word, the above only is preferred embodiment of the present utility model, and all equalizations of being done according to the utility model claim change and modify, and all should belong to the covering scope of the utility model patent.

Claims

1. the safety buffer device of forklift door frame, comprise cylinder seat (6), cylinder body (9), piston (2), push rod (1), oil cabinet (8), receive grease chamber (81) and oil inlet and outlet (7), cylinder seat (6) is combined into cylinder shell with cylinder body (9), piston (2) slides on the inwall of cylinder body (9) by the push-and-pull of push rod (1), oil cabinet (8) is cylinder body (a 9) inner cavity part, receiving grease chamber (81) is cylinder seat (6) inner cavity part, oil cabinet (8) communicates with receipts grease chambeies (81), oil inlet and outlet (7) is opened at cylinder seat (6) and upward and with receipts grease chambeies (81) is communicated, it is characterized in that: piston (2) inside has the plunger shaft (21) that communicates with oil cabinet (8), plunger shaft (21) inwall has a step (212), it is bigger apart from the near a part of internal diameter of oil cabinet (8) to form piston (2) internal piston chamber (21) therefrom, smaller apart from a part of internal diameter that oil cabinet (8) is far away, the plunger shaft of internal diameter smaller portions (21) forms oil spout chamber (211), internal diameter major part plunger shaft (21) is built-in with block ring (3), there is gear ring (4) to be installed in the position that is used to limit block ring (3) on the piston (2), is connected cylinder seat (6) and upward extend in the block ring (3) with the oil pipe (5) that receipts grease chambeies (81) communicate.

2. the safety buffer device of forklift door frame according to claim 1, it is characterized in that: the internal diameter of described block ring (3) is greater than the external diameter of oil pipe (5), oil cabinet (8) communicates with oil spout chamber (21) with slit (22) and slit (23) between piston (2) and the oil pipe (5) by block ring (3), oil spout chamber (21) by oil pipe (5) with receive grease chambeies (81) and communicate.