CN110615389A - Forklift lifting oil cylinder with up-down buffering function - Google Patents
Forklift lifting oil cylinder with up-down buffering function Download PDFInfo
- Publication number
- CN110615389A CN110615389A CN201811329375.7A CN201811329375A CN110615389A CN 110615389 A CN110615389 A CN 110615389A CN 201811329375 A CN201811329375 A CN 201811329375A CN 110615389 A CN110615389 A CN 110615389A
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- cavity
- piston
- cylinder
- buffering
- piston rod
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/24—Electrical devices or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Geology (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Forklifts And Lifting Vehicles (AREA)
- Actuator (AREA)
Abstract
The invention relates to a hydraulic oil cylinder, and aims to solve the problem of up-and-down buffering of a lifting oil cylinder of a forklift. The forklift lifting oil cylinder consists of a cylinder body assembly and a piston rod assembly, the piston rod assembly consists of a piston rod and a piston, the piston divides the inside space of the oil cylinder into a rod cavity and a rodless cavity, the piston rod assembly is provided with a communicating oil way which is communicated with the rod cavity and the rodless cavity all the time and a buffering oil way which plays a role of buffering, the piston is provided with a buffering cavity, a through hole and a stepped hole, and a one-way valve is arranged in the stepped hole; the cylinder body component consists of a cylinder cover, a cylinder and a cylinder head, and a buffer sleeve is arranged in the cylinder cover; when the piston rod assembly moves to the position near the cylinder cover, the buffer sleeve seals an outlet of the communicating oil way in the rod cavity, hydraulic oil flows in from N rows of radial holes on the piston rod and acts on the one-way valve, and the one-way valve is opened to flow out; when the piston rod assembly moves to the position near the cylinder head, the cylindrical buffer plunger on the cylinder head is inserted into the piston buffer cavity, the rodless cavity is relatively closed at the moment, and hydraulic oil flows out from a gap formed by the buffer plunger and the buffer cavity.
Description
Technical Field
The invention relates to a hydraulic oil cylinder, in particular to a forklift lifting oil cylinder with up-down buffering.
Background
In the process of rapid movement of the hydraulic cylinder, strong impact, noise and even mechanical collision can be generated at the stroke end, particularly under the condition of high pressure, the impact is more obvious, the service life of the hydraulic cylinder is seriously influenced, therefore, proper buffering and braking must be carried out before the movement is finished to ensure the service lives of a hydraulic system and the hydraulic cylinder, generally common buffering comprises in-cylinder buffering and out-cylinder buffering, however, the out-cylinder buffering can increase the complexity of the whole hydraulic system and the cost of the whole hydraulic system, the in-cylinder buffering has a simple structure and small volume, and no additional hydraulic elements such as any flow control valve are needed to be added, so that the hydraulic cylinder is an ideal buffering mode.
Most of existing forklift lifting oil cylinders are of structures with lower buffers, and the structures can only protect the lifting oil cylinders from buffering in the descending process and ensure that severe impact between pistons and cylinder heads does not occur in the descending process. The play to rise hydro-cylinder of buffering about the area is very few, and the buffering is realized the throttle through processing on the piston rod round aperture and the piston elongate hole in the last buffering that patent CN104595281M adopted, and this kind of buffering can not produce the buffering of gradual change, and the buffering effect is not good, and the difficult realization of processing elongate hole technology on the piston to this buffer cylinder receives the greasy dirt easily, hardly adjusts the buffering.
Disclosure of Invention
The invention aims to provide a forklift lifting buffer oil cylinder which not only realizes up-down buffering, but also can overcome the defects of poor buffering effect, complex processing technology, easiness in oil stain influence and the like existing in the up-down buffering of the existing forklift lifting oil cylinder.
In order to solve the problems, the invention adopts the technical scheme that: the forklift lifting oil cylinder with the up-and-down buffering function comprises a cylinder body assembly and a piston rod assembly, wherein the cylinder body assembly comprises a cylinder cover, a cylinder and a cylinder head, and the piston rod assembly comprises a piston and a piston rod. One end of the piston rod is connected with the piston, the other end of the piston rod extends out of the oil cylinder from the cylinder cover, the piston divides the inner space of the cylinder body assembly into a rod cavity and a rodless cavity, the end surface of the rodless cavity of the piston is provided with a buffer cavity, and the other end surface of the piston is provided with a stepped hole provided with a one-way valve; the end parts of the oil passage at the inlet and the outlet of the cylinder head are connected with a cylindrical buffer plunger, and an oil inlet and an oil outlet which are formed on the cylinder head are connected with the rodless cavity through an internal passage of the buffer plunger; the piston rod assembly is provided with a communicating oil way which is communicated with the rod cavity and the rodless cavity all the time and a buffering oil way which plays a role in buffering, and a buffering sleeve which plays a role in supporting and buffering is arranged in the cylinder cover close to the side of the rod cavity. According to the invention, when the piston rod assembly moves to the vicinity of the cylinder cover, the upper buffer sleeve seals the outlet of the communicating oil way arranged in the rod cavity, the buffer sleeve and the piston rod assembly form a relatively sealed cavity, hydraulic oil can only flow in from N rows of radial small holes on the piston rod close to the piston side and acts on the one-way valve, the one-way valve is opened through hydraulic oil pressure and flows out from the communicating oil way, the speed of the hydraulic oil flowing out of the rod cavity is reduced due to the damping effect of the small holes and the one-way valve, the hydraulic oil pressure of the rod cavity is improved, so that the speed of the piston rod assembly at the end of the ascending stroke is reduced, and the upper buffer. When the piston rod assembly moves to the position near the cylinder head, the buffering plunger on the cylinder head is inserted into the buffering cavity in the piston, and at the moment, hydraulic oil in the rodless cavity can only flow out of the buffering gap formed by the buffering plunger and the buffering cavity, so that the buffering gap has a damping effect, the speed of the hydraulic oil flowing out of the rodless cavity is reduced, the hydraulic oil pressure of the rodless cavity is improved, the speed of the piston rod assembly when the lifting stroke is ended is reduced, and the lower buffering is realized.
In the buffer oil cylinder, the piston is a stepped shaft, the diameter of the first stepped shaft is large and is matched with the cylinder, and the diameter of the second stepped shaft is small and is sleeved with the concave cavity in the piston rod; the center of the end face of the rodless cavity of the piston is provided with a buffer cavity, the center of the other end face is provided with a through hole, the through hole is communicated with the buffer cavity, the diameter of the buffer cavity is larger than that of the through hole, M stepped holes for assembling the check valves are uniformly formed in the same circumference on the end face of the through hole of the piston, the stepped holes are provided with two steps, the diameter of the stepped holes close to the end face is large, the diameter of the bottom of each stepped hole is small, the outer surface of the second stepped shaft of the piston is close to the position close to the first stepped shaft and is provided with.
In the buffer oil cylinder, the buffer gap is formed by the outer surface of the buffer plunger and the inner surface of the buffer cavity in the piston, and the buffer requirements under different working conditions are met by changing the size of the buffer gap and the length of the buffer plunger.
In the buffer oil cylinder, the end part of the piston rod connected with the piston is provided with a concave cavity, the concave cavity is sleeved with the second stepped shaft of the piston, the bottom of the concave cavity is provided with a large radial hole communicated with the rodless cavity, the number and the size of the large radial holes are suitable for ensuring the oil passing capacity of the rod cavity of the oil cylinder, and the communicated oil way consists of the large radial hole, a gap of the concave cavity at the bottom of the piston rod and a through hole; the front end part of the piston rod concave cavity is provided with N rows of radial small holes which penetrate through the piston rod concave cavity.
The buffering oil cylinder is characterized in that the upper buffering oil way is composed of N rows of radial small holes formed in the front end part of the piston rod cavity, an annular groove in the surface of the second stepped shaft of the piston, radial small holes and stepped holes, a check valve is installed in the stepped holes, and the check valve controls hydraulic oil to flow from the rod cavity to the radial small holes in the front end of the piston rod cavity, then to the annular groove, the radial small holes and the stepped holes and finally to flow out from the through hole, and the reverse oil way is not communicated. The gradual upper buffering is realized by the distribution and the number of the radial small holes on the piston rod, the size of the radial small holes, the number of the one-way valves in the piston and the pre-compression force of the one-way valves.
Drawings
FIG. 1 is a cross-sectional view of a lift cylinder of a forklift truck according to the present invention
FIG. 2 schematic view of the flow of the lower buffer hydraulic oil of the buffer cylinder
FIG. 3 is a schematic view of buffer hydraulic oil flow on the buffer cylinder
Part names and serial numbers in the figure: the cylinder comprises a cylinder cover 1, a cylinder 2, a piston rod 3, a rod cavity 4, a large radial hole 5, a one-way valve 6, N rows of radial small holes 7, a piston 8, a rodless cavity 9, a cylinder head 10, an oil inlet and outlet 11, a buffer plunger 12, a buffer cavity 13, an annular groove 14, radial small holes 15, a cavity bottom gap 16, a through hole 17 and a buffer sleeve 18.
Detailed Description
The following description of the embodiments refers to the accompanying drawings.
As shown in fig. 1, the lift cylinder of the forklift in this embodiment includes a cylinder body assembly and a piston rod assembly, the cylinder body assembly includes a cylinder cover 1, a cylinder 2 and a cylinder head 10, and the piston rod assembly includes a piston 8 and a piston rod 3. One end of a piston rod 3 is connected with a piston 8, the other end of the piston rod extends out of the cylinder from a cylinder cover 1, the piston 3 divides the inner space of the cylinder assembly into a rod cavity 4 and a rodless cavity 9, a buffer cavity 13 is formed in the piston 3, a cylindrical buffer plunger 12 is connected to a cylinder head 10, and an oil inlet and outlet 11 formed in the cylinder head 3 is connected with the rodless cavity 9 through a channel in the buffer plunger 12; the piston rod assembly is provided with a communicating oil way which is communicated with the rod cavity 4 and the rodless cavity 9 all the time and a buffering oil way which plays a role of buffering, and a buffering sleeve 18 which plays a role of supporting and buffering is arranged in the cylinder cover 1 and close to the rod cavity 4. When the piston 8 moves to the vicinity of the cylinder cover 1, the buffer sleeve 18 and the piston rod assembly form a relatively sealed cavity, hydraulic oil can only flow into the check valve 6 from the N rows of radial small holes 7 on the piston rod 3 close to the piston side, the check valve 6 is opened through hydraulic oil pressure, and upper buffering is realized, wherein fig. 3 is a schematic flow diagram of the hydraulic oil during the upper buffering. When the piston rod assembly moves to the vicinity of the cylinder head 10, the buffer plunger 12 on the cylinder head is inserted into the buffer cavity 13 in the piston, and hydraulic oil can only flow out from the buffer gap formed by the buffer plunger 12 and the buffer cavity 13, so as to realize lower buffering, and fig. 2 is a schematic flow diagram of hydraulic oil during lower buffering.
As shown in fig. 1, the piston 8 is a stepped shaft, the first stepped shaft has a large diameter and is matched with the cylinder 2, and the second stepped shaft has a small diameter and is sleeved with a concave cavity in the piston rod; a buffer cavity 13 is formed in the center of the end face of the piston 8 close to the cylinder head 10, a through hole 17 is formed in the center of the end face of the other side of the piston and communicated with the buffer cavity 13, M stepped holes for assembling one-way valves are uniformly formed in the same circumference of the side of the piston, an annular groove 14 is formed in the position, close to the first step, of the outer surface of the second stepped shaft of the piston, and a small radial hole 15 formed in the bottom of the stepped hole penetrates through the stepped hole and the annular.
As shown in FIG. 1, the buffer gap is formed by the outer surface of the buffer plunger 12 and the inner surface of the buffer cavity 13 in the piston, and the buffer requirements under different working conditions can be met by changing the size of the buffer gap and the length of the buffer plunger 12.
As shown in fig. 1, a concave cavity is formed at the end part of the piston rod 3 connected with the piston second stepped shaft, the concave cavity is sleeved with the piston second stepped shaft, a large radial hole 5 communicated with the rodless cavity is formed at the bottom of the concave cavity, and the communicated oil path is composed of the large radial hole 5, a gap 16 of the concave cavity at the bottom of the piston rod and a through hole 17; the front end of the concave cavity of the piston rod is provided with N rows of radial small holes 7 which penetrate through the concave cavity.
As shown in fig. 1, the upper buffer oil path is composed of N rows of radial small holes 7, an annular groove 14, radial small holes 15 and a check valve channel (stepped hole) which are arranged at the front end of the piston rod cavity, wherein the check valve 6 is arranged in the check valve channel (stepped hole). Gradual upper buffering is realized through the distribution and the number of the radial small holes 7 on the piston rod 3, the size of the radial small holes 7, the number of the one-way valves 6 in the piston and the pre-compression force of the one-way valves 6.
Claims (5)
1. The utility model provides a fork truck plays to rise hydro-cylinder with buffering from top to bottom, includes cylinder body subassembly and piston rod subassembly, the cylinder body subassembly comprises cylinder cap, a section of thick bamboo and cylinder head, the piston rod subassembly comprises piston and piston rod. One end of the piston rod is connected with the piston, the other end of the piston rod extends out of the oil cylinder from the cylinder cover, the piston divides the inner space of the cylinder body assembly into a rod cavity and a rodless cavity, the end surface of the rodless cavity of the piston is provided with a buffer cavity, and the other end surface of the piston is provided with a step hole and a through hole which are provided with a one-way valve; the end parts of the oil passage at the inlet and the outlet of the cylinder head are connected with a cylindrical buffer plunger, and an oil inlet and an oil outlet which are formed on the cylinder head are connected with the rodless cavity through an internal passage of the buffer plunger; the piston rod assembly is provided with a communicating oil way which is communicated with the rod cavity and the rodless cavity all the time and a buffering oil way which plays a role in buffering, and a buffering sleeve which plays a role in supporting and buffering is arranged in the cylinder cover close to the side of the rod cavity. When the piston moves to the position near the cylinder cover, the buffer sleeve and the piston rod assembly form a relatively sealed cavity, hydraulic oil can only flow in from N rows of radial small holes on the piston rod, which are close to the piston side, acts on the one-way valve, and the one-way valve is opened through hydraulic oil pressure to realize upper buffering. When the piston moves to the position near the cylinder head, the buffering plunger on the cylinder head is inserted into the buffering cavity in the piston, and hydraulic oil can only flow out from the buffering gap formed by the buffering plunger and the buffering cavity, so that lower buffering is realized.
2. A lifting cylinder as claimed in claim 1, wherein the piston is a stepped shaft, the first stepped shaft has a large diameter and is fitted with the cylinder barrel, and the second stepped shaft has a small diameter and is fitted with the cavity in the piston rod; the center of the end face of the rodless cavity of the piston is provided with a buffer cavity, the center of the other end face is provided with a through hole, the through hole is communicated with the buffer cavity, the diameter of the buffer cavity is larger than that of the through hole, M stepped holes for assembling the check valves are uniformly formed in the same circumference on the end face of the through hole of the piston, the stepped holes are provided with two steps, the diameter of the stepped holes close to the end face is large, the diameter of the bottom of each stepped hole is small, the outer surface of the second stepped shaft of the piston is close to the position close to the first stepped shaft and is provided with.
3. The lifting oil cylinder as claimed in claim 1 or 2, wherein the end of the piston rod connected to the piston is provided with a cavity, the cavity is sleeved with the second step shaft of the piston, the bottom of the cavity is provided with a large radial hole communicated with the rod cavity, and the communicated oil path is composed of the large radial hole, a gap of the cavity at the bottom of the piston rod and a through hole; the front end part of the piston rod concave cavity is provided with N rows of radial small holes which penetrate through the piston rod concave cavity.
4. A lifting oil cylinder as claimed in claims 2 and 3, wherein the upper buffer oil passage is formed by N rows of radial small holes formed at the front end of the cavity of the piston rod, an annular groove on the surface of the second stepped shaft of the piston, radial small holes on the second stepped shaft of the piston, and stepped holes, and a check valve is installed in the stepped holes and controls the hydraulic oil to flow from the rod cavity to the radial small holes at the front end of the cavity of the piston rod, then to the annular groove, the radial small holes, and the stepped holes, and finally to flow out from the through holes, and the reverse oil passage is not communicated.
5. A lifting cylinder as claimed in claim 1, wherein the buffer plunger is located in the rodless chamber of the cylinder, and the buffer gap during the lower buffering process is formed by a gap formed by the outer surface of the buffer plunger and the inner surface of the piston buffer chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811329375.7A CN110615389A (en) | 2018-10-31 | 2018-10-31 | Forklift lifting oil cylinder with up-down buffering function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811329375.7A CN110615389A (en) | 2018-10-31 | 2018-10-31 | Forklift lifting oil cylinder with up-down buffering function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110615389A true CN110615389A (en) | 2019-12-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811329375.7A Pending CN110615389A (en) | 2018-10-31 | 2018-10-31 | Forklift lifting oil cylinder with up-down buffering function |
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| Country | Link |
|---|---|
| CN (1) | CN110615389A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114084858A (en) * | 2021-11-26 | 2022-02-25 | 深圳扬宁汽车配件有限公司 | Piston assembly and hydraulic jack |
-
2018
- 2018-10-31 CN CN201811329375.7A patent/CN110615389A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114084858A (en) * | 2021-11-26 | 2022-02-25 | 深圳扬宁汽车配件有限公司 | Piston assembly and hydraulic jack |
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