CN203740982U - Plunger type buffering main lifting cylinder of full free mast of forklift - Google Patents
Plunger type buffering main lifting cylinder of full free mast of forklift Download PDFInfo
- Publication number
- CN203740982U CN203740982U CN201420141095.4U CN201420141095U CN203740982U CN 203740982 U CN203740982 U CN 203740982U CN 201420141095 U CN201420141095 U CN 201420141095U CN 203740982 U CN203740982 U CN 203740982U
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- China
- Prior art keywords
- oil
- plunger
- cylinder
- cylinder bottom
- plunger rod
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- Expired - Fee Related
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- Forklifts And Lifting Vehicles (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The utility model discloses a plunger type buffering main lifting cylinder of a full free mast of a forklift. The plunger type buffering main lifting cylinder comprises a cylinder body and a plunger rod capable of sliding in the cylinder body. The lower portion of the cylinder body is a cylinder bottom, an oil cavity is formed between the cylinder bottom and the plunger rod, a hollow buffering plunger extending into the oil cavity is arranged at the center of the cylinder bottom integrally, a blind hole allowing the buffering plunger to be inserted in is formed in the bottom of the plunger rod, and a shaft sleeve is arranged in the blind hole. The buffering plunger is hollow and arranged as a main oil passage, and the main oil passage is through from the cylinder bottom and communicated with the oil cavity and an oil inlet of the cylinder bottom. The cylinder bottom is provided with an auxiliary oil passage which is communicated with the oil cavity and the oil inlet, and a one-way valve is arranged in the auxiliary oil passage and only allows the oil inlet to supply oil into the oil cavity. Impact of the plunger rod on the cylinder bottom can be relieved to achieve buffering and damping effect, and reliability of a hydraulic cylinder is improved; meanwhile, when the full free mast is lifted, disorder of the main lifting cylinder and an auxiliary lifting cylinder is avoided.
Description
Technical field:
The utility model relates to the full free gantry plunger tpe of a kind of fork truck and cushions main lift oil tank.
Background technology:
It is single-acting plunger type hydraulic cylinder that the current full free gantry of fork truck promotes main lift oil tank, in conjunction with Fig. 1, oil cylinder comprises cylinder body 1, plunger rod 2, we hoist hydraulic cylinder raising process plunger rod 2 process of stretching out hereinafter to be referred as oil cylinder, the process that plunger rod is retracted into cylinder body declines hereinafter to be referred as oil cylinder hydraulic actuating cylinder decline process.In conjunction with Fig. 1, oil cylinder hoists and is achieved in that hydraulic oil is in the oil duct of cylinder bottom 3 enters oil pocket 7, by pressure by plunger rod 2 jack-up; When plunger rod declines, under the Action of Gravity Field of plunger rod, door frame and goods, decline with certain acceleration/accel, in the time approaching cylinder base with the speed of about 400mm/s and inertia impact cylinder bottom greatly, at the bottom of plunger rod and oil cylinder, will produce strong shock, and cause that fork truck trembles, will inevitably have a strong impact on the intensity of hydraulic ram and whole hydraulic efficiency pressure system and normally work.
Summary of the invention:
For overcoming the defect of prior art, the purpose of this utility model is to provide the full free gantry plunger tpe of a kind of fork truck to cushion main lift oil tank, can slow down the impact of plunger rod to cylinder bottom, plays the effect of bumper and absorbing shock, has improved the reliability of hydraulic ram; Avoided simultaneously full free gantry major-minor in the time hoisting hoist cylinder produce string cylinder phenomenon.
The utility model technical solution problem adopts following technical scheme:
The full free gantry plunger tpe of fork truck cushions main lift oil tank, comprises cylinder body, the plunger rod that can slide up and down in described cylinder body, between described plunger rod outer wall and described inboard wall of cylinder block, is provided with seal ring; The bottom of cylinder body is cylinder bottom, between described cylinder bottom and described plunger rod, it is oil pocket, the center integral type of described cylinder bottom is provided with to the buffer plunger of the hollow of extending in described oil pocket, and the bottom of described plunger rod is provided with the blind hole that allows described buffer plunger to insert, and in described blind hole, is provided with axle sleeve;
Described buffer plunger hollow is made as oil main line, and described oil main line connects and is communicated with the oil inlet of described oil pocket and cylinder bottom from cylinder bottom;
Be provided with secondary oil duct at described cylinder bottom, described secondary oil duct is communicated with described oil pocket and described oil inlet, and is provided with check valve in described secondary oil duct, and described check valve only allows oil inlet to fuel feeding in oil pocket.
Described buffer plunger and described cylinder bottom are integral type structure, and the top of buffer plunger is with tapering.
Described axle sleeve and described blind hole free-running fit, be provided with the elastic spring that stops described axle sleeve to come off at the oral area of described blind hole.
Compared with the prior art, the beneficial effects of the utility model are embodied in:
The utility model arranges oil main line and is provided with the secondary oil duct of check valve at the center of cylinder bottom, when the full free gantry of fork truck two-stage hoists, require main lift oil tank first to hoist, and the main lift oil tank pressure that hoists is less than secondary lift oil tank; In the time that oil cylinder starts to hoist, because oil main line is by axle sleeve throttling shutoff, oil-feed is not smooth, and the resistance that hoists of main lift oil tank is large, now easily causes auxiliary oil cylinder first to hoist, and the phenomenon that then master cylinder just hoists produces string cylinder problem.Owing to being provided with secondary oil duct and check valve, when main lift oil tank hoists, check valve is opened, and hydraulic oil is through secondary oil duct to oil pocket fuel feeding, and oil cylinder just can normally start.When completing after enhancing action, in the time that plunger body is descending rapidly, secondary oil duct is blocked up by unidirectional jam pot cover, in oil pocket, hydraulic oil is through oil main line oil return, in the time dropping to axle sleeve and touch the oil main line of buffer plunger, buffer plunger enters in axle sleeve, make the hydraulic oil in oil pocket can only be by the gap between axle sleeve and buffer plunger, slowly flow to oil main line and carry out oil return, due to the throttling action in gap, hydraulic oil in oil pocket just forms descending the produced impulsive force of immense pressure opposing plunger rod like this, and the descending speed of plunger rod is slowed down, and plays good buffer action.Avoid the impact of plunger body to cylinder bottom, avoided, because the strong fork truck causing that clashes into trembles, having ensured intensity and the smooth working of fork truck hydraulic ram and whole hydraulic efficiency pressure system simultaneously.
Brief description of the drawings:
Fig. 1 is the structural representation of existing oil cylinder; Fig. 2 is the structural representation of the utility model oil cylinder.
Number in the figure: 1 cylinder body, 2 plunger rods, 3 cylinder bottoms, 4 buffer plungers, 5 check valves, 6 secondary oil ducts, 7 oil pockets, 8 oil mains line, 9 blind holes, 10 axle sleeves, 11 back-up rings, 12 oil inlets.
Below pass through detailed description of the invention, and the utility model is described in further detail by reference to the accompanying drawings.
Detailed description of the invention:
Embodiment: in conjunction with Fig. 2, the full free gantry plunger tpe of the fork truck of the present embodiment cushions main lift oil tank, and the plunger rod 2 that comprise cylinder body 1, can slide up and down in cylinder body is provided with seal ring between plunger rod 2 outer walls and inboard wall of cylinder block; The bottom of cylinder body is cylinder bottom 3, is oil pocket 7 between cylinder bottom and plunger rod, and the center integral type of cylinder bottom is provided with to the buffer plunger 4 of the hollow of extending in oil pocket, and the bottom of plunger rod 2 is provided with the blind hole 9 that allows buffer plunger to insert, and is provided with axle sleeve 10 in blind hole; Buffer plunger 4 hollows are made as oil main line 8, and oil main line 8 connects and is communicated with the oil inlet 12 of oil pocket 7 and cylinder bottom from cylinder bottom; Be provided with secondary oil duct 6 at cylinder bottom, secondary oil duct is communicated with oil pocket and oil inlet 12, and is provided with check valve 5 in secondary oil duct, and check valve only allows oil inlet to fuel feeding in oil pocket.While being oil return, closed check valve, only has oil main line 8 to be communicated with oil pocket 7 and oil inlet 12.
In specifically arranging, buffer plunger 4 is integral type structure with cylinder bottom 3, and the top of buffer plunger 4 is with tapering.Axle sleeve 10 and blind hole free-running fit, be provided with the elastic spring 11 that stops axle sleeve 6 to come off at the oral area of blind hole.
Working process: while starting to hoist, because oil main line 8 is by axle sleeve 10 throttling shutoff, oil-feed is not smooth, and now check valve 5 is opened, and hydraulic oil mainly enters in oil pocket 7 from the secondary oil duct 6 of cylinder bottom 3, it is up that generation pressure orders about plunger rod 2, avoids producing string cylinder phenomenon; When buffer plunger 4 departs from after axle sleeve 10, hydraulic oil enters in oil pocket 7 from oil main line 8 and the secondary oil duct 6 of cylinder bottom 3 simultaneously, has continued enhancing action.After lifting work completes, at outside pallet fork, under the Action of Gravity Field of door frame and plunger rod etc., plunger rod 2 is descending rapidly in cylinder body 1, check valve 5 is closed secondary oil duct 6 shutoff, hydraulic oil in oil pocket 7 can only reflux to oil main line 8 rapidly from oil pocket 7, when axle sleeve 10 drops to while fitting with buffer plunger 4, shutoff oil main line 8 loops, hydraulic oil can only enter blind hole 9 by the gap between axle sleeve 10 and buffer plunger 4, carry out oil return to oil main line 8 again, because hydraulic oil can only carry out oil return through gap, oil pocket internal pressure rises and forms the antagonistic force to plunger body, make plunger rod 2 moment deceleration buffer, the descending speed of plunger rod is progressively slack-off, so just play buffering effect, eliminate the impact that plunger rod declines to cylinder bottom, also avoid trembling because of the strong fork truck causing that clashes into, intensity and the reliability of hydraulic ram and whole hydraulic efficiency pressure system are improved.
Claims (3)
1. the full free gantry plunger tpe of fork truck cushions main lift oil tank, and the plunger rod (2) that comprise cylinder body (1), can slide up and down in described cylinder body, is provided with seal ring between described plunger rod outer wall and described inboard wall of cylinder block; The bottom of cylinder body is cylinder bottom (3), between described cylinder bottom and described plunger rod, be oil pocket (7), the center integral type of described cylinder bottom is provided with to the buffer plunger (4) of the hollow of extending in described oil pocket, the bottom of described plunger rod (2) is provided with the blind hole (9) that allows described buffer plunger to insert, and is provided with axle sleeve (10) in described blind hole;
Described buffer plunger (4) hollow is made as oil main line (8), and described oil main line (8) connects and is communicated with the oil inlet (12) of described oil pocket (7) and cylinder bottom from cylinder bottom;
It is characterized in that, be provided with secondary oil duct (6) at described cylinder bottom, described secondary oil duct is communicated with described oil pocket and described oil inlet (12), and is provided with check valve (5) in described secondary oil duct, and described check valve only allows oil inlet to fuel feeding in oil pocket.
2. the full free gantry plunger tpe of fork truck according to claim 1 cushions main lift oil tank, it is characterized in that, described buffer plunger (4) is integral type structure with described cylinder bottom (3), and the top of buffer plunger (4) is with tapering.
3. the full free gantry plunger tpe of fork truck according to claim 1 cushions main lift oil tank, it is characterized in that described axle sleeve (10) and described blind hole free-running fit are provided with the elastic spring (11) that stops described axle sleeve (6) to come off at the oral area of described blind hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420141095.4U CN203740982U (en) | 2014-03-26 | 2014-03-26 | Plunger type buffering main lifting cylinder of full free mast of forklift |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420141095.4U CN203740982U (en) | 2014-03-26 | 2014-03-26 | Plunger type buffering main lifting cylinder of full free mast of forklift |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203740982U true CN203740982U (en) | 2014-07-30 |
Family
ID=51340810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420141095.4U Expired - Fee Related CN203740982U (en) | 2014-03-26 | 2014-03-26 | Plunger type buffering main lifting cylinder of full free mast of forklift |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203740982U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106946192A (en) * | 2017-05-10 | 2017-07-14 | 蚌埠液力机械有限公司 | Fork truck lifting oil cylinder with New Buffering structure |
| CN107235451A (en) * | 2017-06-22 | 2017-10-10 | 安徽合力股份有限公司 | A kind of low delay for level Four above door frame starts and leaks cushion cylinder in anti- |
-
2014
- 2014-03-26 CN CN201420141095.4U patent/CN203740982U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106946192A (en) * | 2017-05-10 | 2017-07-14 | 蚌埠液力机械有限公司 | Fork truck lifting oil cylinder with New Buffering structure |
| CN107235451A (en) * | 2017-06-22 | 2017-10-10 | 安徽合力股份有限公司 | A kind of low delay for level Four above door frame starts and leaks cushion cylinder in anti- |
| CN107235451B (en) * | 2017-06-22 | 2023-02-24 | 安徽合力股份有限公司 | Low-delay starting and inner-leakage-preventing buffer oil cylinder for portal above four levels |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140730 Termination date: 20180326 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |