CN210715357U - Buffer hydraulic oil cylinder - Google Patents
Buffer hydraulic oil cylinder Download PDFInfo
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- CN210715357U CN210715357U CN201920926580.5U CN201920926580U CN210715357U CN 210715357 U CN210715357 U CN 210715357U CN 201920926580 U CN201920926580 U CN 201920926580U CN 210715357 U CN210715357 U CN 210715357U
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Abstract
The utility model discloses a buffer hydraulic oil cylinder, which comprises a cylinder bottom and a cylinder sleeve fixedly connected with the cylinder bottom, wherein a piston is arranged in the cylinder sleeve in an axial sliding manner, and a buffer part is arranged at one end of the piston close to the cylinder bottom; the buffer part comprises a buffer column, a buffer sleeve is sleeved on the buffer column, a buffer oil duct which runs through the buffer column is arranged in the buffer column, a first buffer oil duct for lifting buffer is formed between the outer wall of the buffer column and the inner wall of the cavity in the piston, and a second buffer oil duct for descending buffer is formed between the outer wall of the buffer column and the inner wall of the buffer sleeve; the utility model discloses a shorten the length of cushion collar, reduced the processing degree of difficulty of cushion collar, guarantee the axiality between cushion collar and the buffering post more easily, and then reduced the control degree of difficulty in clearance between cushion collar and the buffering post, guaranteed stable buffering effect.
Description
Technical Field
The utility model relates to a pneumatic cylinder technical field specifically is a buffer hydraulic oil cylinder.
Background
The hydraulic oil cylinder is one of the indispensable important parts of the forklift system, and the lifting and descending of the portal frame and the steering of the forklift are realized through the hydraulic oil cylinder. Along with the promotion of end user to fork truck operation travelling comfort demand, hydro-cylinder technique also obtains constantly updating. Wherein the descending clearance buffer structure of the lifting oil cylinder of the gantry is gradually applied and matured. The structure diagram is shown in figure 1.
The existing gap buffer structure has the following defects:
1. the length L of the buffer sleeve is too long, and the buffer gap delta is ensured for ensuring the buffer effect1The coaxiality of the buffer sleeve and the buffer column needs to be ensured because the buffer sleeve and the buffer column are kept consistent (as shown in figure 2), so that the problems of difficult processing, poor stability in the use process, easy pull and the like are caused when unbalance loading occurs;
2. as the effective contact area between the steel wire retainer ring (the part 3 in the attached figure 1) and the buffer sleeve is ensured, the buffer sleeve is prevented from falling off, and the gap delta between the buffer sleeve and the inner hole of the piston is ensured2The hydraulic oil can not be designed to be too large, and in the initial lifting section of the oil cylinder, the hydraulic oil enters a small gap delta through the bottom of the oil cylinder2The channel bypasses the steel wire retainer ring to enter the bottom of the piston, so that the oil cylinder is lifted. In a buffer area, the oil cylinder response time is long due to the small oil passing gap, and the phenomenon of cylinder pulling in a gantry system can be caused seriously.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a buffering hydraulic cylinder to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a buffer hydraulic oil cylinder comprises a cylinder bottom and a cylinder sleeve fixedly connected with the cylinder bottom, wherein a piston is axially arranged in the cylinder sleeve in a sliding manner, and a buffer part is arranged at one end, close to the cylinder bottom, of the piston;
the buffer part comprises a buffer column, a cavity for accommodating the buffer column is formed in the end face, close to the cylinder bottom, of the piston, the buffer column is fixedly connected in the cavity, one end, close to the cylinder bottom, of the buffer column extends to the outside of the piston, a buffer sleeve is sleeved on the buffer column and is slidably connected in the cavity, a buffer oil duct penetrating through the buffer column is formed in the buffer column, a first buffer oil duct for lifting buffer is formed between the outer wall of the buffer column and the inner wall of the cavity in the piston, and a second buffer oil duct for descending buffer is formed between the outer wall of the buffer column and the inner wall of the buffer sleeve;
one end of the cylinder bottom, which is close to the piston, is provided with a buffer hole for accommodating the buffer column, and an oil hole is formed in the cylinder bottom and communicated with the buffer hole.
As a further aspect of the present invention: the cavity is of a stepped hole structure, the cavity comprises a first mounting hole and a second mounting hole, the inner diameter of the first mounting hole is smaller than that of the second mounting hole, the buffer column is fixedly connected into the first mounting hole, and the inner diameter of the first mounting hole is larger than the outer diameter of the buffer column.
As a further aspect of the present invention: the buffer sleeve is connected in the second mounting hole in a sliding mode, and an elastic check ring used for limiting the buffer sleeve is detachably connected in the second mounting hole.
As a further aspect of the present invention: the elastic retainer ring is positioned on one side, close to the cylinder bottom, of the second mounting hole, and the buffer sleeve is positioned on one side, far away from the cylinder bottom, of the elastic retainer ring.
As a further aspect of the present invention: the outer diameter of the buffer sleeve is not smaller than the inner diameter of the first mounting hole, and the outer diameter of the buffer sleeve is smaller than the inner diameter of the second mounting hole.
As a further aspect of the present invention: and one end of the buffer oil duct, which is far away from the cylinder bottom, is communicated with the first mounting hole.
As a further aspect of the present invention: and one end of the buffer sleeve close to the cylinder bottom is radially provided with at least one oil groove.
As a further aspect of the present invention: the oil grooves are four and are evenly distributed.
As a further aspect of the present invention: the periphery of the piston is clamped with a sealing ring and a supporting ring.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model reduces the processing difficulty of the buffer sleeve by shortening the length of the buffer sleeve, ensures the coaxiality between the buffer sleeve and the buffer column more easily, further reduces the control difficulty of the gap between the buffer sleeve and the buffer column, and ensures the stable buffer effect;
2. this application is through setting up the gliding cushion collar of piston and cushion post relatively, the oil groove has been seted up in the bottom of cushion collar simultaneously, therefore play to rise the buffering stage, can effectually avoid because the throttling problem that the cushion collar hugs closely and cause with the circlip, simultaneously because the size in clearance between the cushion collar that increases and the first mounting hole in the piston, therefore further increased and played the hydraulic oil throughput capacity that rises the buffering stage, pneumatic cylinder circulation resistance has been reduced, thereby accelerate the response speed who plays to rise the hydro-cylinder, the appearance of pulling out the jar has been avoided.
Drawings
FIG. 1 is a schematic diagram of a gap buffering structure of a hydraulic oil cylinder in the prior art;
FIG. 2 is a partial view of a gap buffering structure of a hydraulic cylinder in the prior art;
FIG. 3 is a schematic view of the gap buffering structure of the hydraulic cylinder of the present invention;
FIG. 4 is a schematic view of the structure of the cushion collar of the present invention;
FIG. 5 is a schematic view of the structure of the cylinder bottom of the present invention;
fig. 6 is a partial schematic view of the piston according to the present invention.
In the figure: 1-cylinder bottom, 12-oil hole, 13-buffer hole, 2-buffer column, 21-buffer oil duct, 3-steel wire retainer ring, 4-piston, 41-first mounting hole, 42-second mounting hole, 5-buffer sleeve, 51-oil groove, 6-support ring, 7-seal ring, 8-cylinder sleeve and 9-elastic retainer ring.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-6, in an embodiment of the present invention, a buffer hydraulic cylinder includes a cylinder bottom 1 and a cylinder sleeve 8 disposed at one end of the cylinder bottom 1, the cylinder bottom 1 is welded to the cylinder sleeve 8, a piston 4 is axially slidably connected to the cylinder sleeve 8, a buffer column 2 is disposed at one end of the piston 4 close to the cylinder bottom 1, one end of the buffer column 2 is fixedly disposed in the piston 4, the other end of the buffer column 2 extends to the outside of the piston 4 in a direction close to the cylinder bottom 1, a buffer hole 13 is disposed at one end of the cylinder bottom 1 close to the piston 4, and one end of the buffer column 2 close to the cylinder bottom 1 can be inserted into the buffer hole 13;
one end of the piston 4 close to the cylinder bottom 1 is provided with a mounting hole coaxial with the piston 4, the mounting hole comprises a first mounting hole 41 and a second mounting hole 42, the buffer column 2 is fixedly connected in the first mounting hole 41, the inner diameter of the first mounting hole 41 is larger than the outer diameter of the buffer column 2, so that a gap is formed between the inner wall 41 of the first mounting hole and the outer wall of the buffer column 2, meanwhile, the outer side of the buffer column 2 is sleeved with a buffer sleeve 5, the buffer sleeve 5 is in clearance fit with the buffer column 2, so that another gap is formed between the inner wall of the buffer sleeve 5 and the outer wall of the buffer column 2, the buffer sleeve 5 is connected in the second mounting hole 42, one end of the second mounting hole 42 far away from the first mounting hole 41 is detachably connected with an elastic check ring 9, the buffer sleeve 5 is positioned between the elastic check ring 9 and a mounting hole shoulder, one end of the buffer sleeve 5 close to the elastic check ring 9 starts to, in the present embodiment, the oil grooves 51 are provided in four and evenly arranged;
a buffer oil duct 21 which is coaxial with the buffer column 2 is arranged in the buffer column 2, the buffer oil duct 21 penetrates through the buffer column 2, one end, far away from the cylinder bottom 1, of the buffer oil duct 21 is communicated with the first mounting hole 41, when the buffer column 2 is inserted into the buffer hole 13, the buffer oil duct 21 is communicated with the buffer hole 13, an oil hole 12 is formed in the cylinder bottom 1 and used for feeding and discharging hydraulic oil, and the oil hole 12 is communicated with the buffer hole 13;
the outer side of piston 4 is equipped with support ring 6 and sealing washer 7, supports the piston through support ring 6, and sealing washer 7 cup joints in the piston 4 outside. The sealing washer 7 joint is in cylinder liner 8, and then divide into two alternate segregation's variable space with cylinder liner 8 through sealing washer 7, and the one end that is close to the cylinder end 1 is the rodless chamber that communicates with the oilhole 12 on the cylinder end 1, and the one end of keeping away from the cylinder end 1 is the chamber that has the pole that is used for holding the piston rod.
When the oil cylinder needs to be lifted, high-pressure oil is pumped into the oil hole 12, in a lifting buffering stage, the high-pressure oil enters the buffering oil duct 21 in the buffering column 2 through the oil hole 12, then flows into the first mounting hole 41 through the buffering oil duct 21, the high-pressure oil flowing into the first mounting hole 41 presses the bottom end face of the first mounting hole 41, so that the two ends of the piston 4 are stressed unevenly, and the piston 4 tends to move in the direction away from the cylinder bottom 1, meanwhile, as the end, far away from the piston 4, of the buffering column 2 is inserted into the buffering hole 13, the hydraulic oil cannot directly flow to a space between the piston 4 and the cylinder bottom 1 through the buffering hole 13, namely, a rodless cavity is formed, and therefore, in the process that the piston 4 moves in the direction away from the cylinder bottom 1, the rodless cavity generates negative pressure, and under the dual effects of the self pressure of the hydraulic oil in the first mounting hole 41 and the negative pressure of the rodless cavity, the hydraulic oil flows from the first mounting hole 41 to a gap (i.e. 3 in fig. 3) between the cushion post 2 and the first mounting hole 41, and flows through the gap to the second mounting hole 42, in the flowing process, under the pushing of the hydraulic oil, the cushion sleeve 5 moves to a direction close to the elastic collar 9 until the cushion sleeve 5 contacts with the elastic collar 9, because the oil groove 51 is opened at one end of the cushion sleeve 5 close to the elastic collar 9, the hydraulic oil can flow from the second mounting hole 42 to the rodless cavity through the oil groove 51 and the elastic collar 9, and further can continuously push the piston 4 to move to a direction far away from the cylinder bottom 1, in this embodiment, the gap between the cushion post 2 and the first mounting hole 41 is large, and a plurality of oil grooves are started at the lower end of the cushion sleeve 5, when lifting, the cushion sleeve 5 clings to the elastic collar 9, but no throttling is caused, thereby ensuring the stability of the hydraulic oil flowing to the cushion stage, therefore, the response speed of lifting is accelerated, and the phenomenon of cylinder pulling is avoided; in the moving process, the space of the rodless cavity is gradually enlarged and is filled with hydraulic oil, the buffer column 2 is gradually pulled out from the buffer hole 13 until the buffer column 2 is completely separated from the buffer hole 13, and at the moment, the hydraulic oil directly flows to the rodless cavity from the buffer hole 13 and pushes the piston 4 to move in the direction far away from the cylinder bottom 1, namely, the lifting stage is stabilized.
When the oil cylinder descends, the piston 4 moves towards the direction close to the cylinder bottom 1 at the initial stage of descending, so that the space of the rodless cavity is continuously compressed and reduced, the hydraulic oil in the rodless cavity is discharged out of the oil cylinder through the buffer hole 13 and the oil hole 12, at this time, the stable descending stage is realized, when descending is formed and reaches the end which is about to finish, namely, the descending buffer stage, the buffer column 2 is contacted with the buffer hole 13 and starts to be inserted into the buffer hole 13, so that the rodless cavity blocked by the buffer column 12 is communicated with the buffer hole 13, a direct return channel of the hydraulic oil is cut off, and the oil pressure in the rodless cavity is increased, because the buffer sleeve 5 is pushed by the piston 4 to move downwards in the descending process, the upper end of the buffer sleeve 5 at this time is tightly attached to a shaft shoulder between the first mounting hole 41 and the second mounting hole 42, so that a gap between the buffer column 2 and the first mounting hole 41 is cut off (namely, a gap III in figure 3), because the pressure of the rodless cavity is continuously increased, pressure difference is generated between the rodless cavity and the buffer oil duct 21 and between the rodless cavity and the buffer hole 13, and hydraulic oil passes through a gap between the buffer column 2 and the buffer sleeve 5 (namely, a gap delta in the attached figure 3) from the rodless cavity under the action of the pressure difference1) The hydraulic oil cylinder can continuously descend due to the fact that the oil return channel needs to pass through the gap between the buffer column 2 and the buffer sleeve 5, the hydraulic oil return channel is narrowed, the descending speed of the piston 4 is reduced, the end, descending, of the lifting oil cylinder is buffered, and the safety of the lifting oil cylinder is guaranteed.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. A buffering hydraulic oil cylinder comprises a cylinder bottom (1) and a cylinder sleeve (8) fixedly connected with the cylinder bottom (1), wherein a piston (4) is arranged in the cylinder sleeve (8) in an axial sliding manner, and is characterized in that a buffering part is arranged at one end, close to the cylinder bottom (1), of the piston (4);
the buffer part comprises a buffer column (2), the end surface of the piston (4) close to the cylinder bottom (1) is provided with a cavity for accommodating the buffer column (2), the buffer column (2) is fixedly connected in the cavity, one end of the buffer column (2) close to the cylinder bottom (1) extends to the outside of the piston (4), the buffer column (2) is sleeved with a buffer sleeve (5), the buffer sleeve (5) is connected in the cavity in a sliding way, a buffer oil duct (21) which runs through the buffer column (2) is arranged in the buffer column (2), a first buffer oil duct for lifting buffer is formed between the outer wall of the buffer column (2) and the inner wall of the cavity in the piston (4), a second buffer oil passage for descending buffer is formed between the outer wall of the buffer column (2) and the inner wall of the buffer sleeve (5);
one end, close to the piston (4), of the cylinder bottom (1) is provided with a buffer hole (13) used for containing the buffer column (2), an oil hole (12) is formed in the cylinder bottom (1), and the oil hole (12) is communicated with the buffer hole (13).
2. The buffer hydraulic oil cylinder according to claim 1, wherein the cavity is of a stepped hole structure, the cavity comprises a first mounting hole (41) and a second mounting hole (42), the inner diameter of the first mounting hole (41) is smaller than that of the second mounting hole (42), the buffer column (2) is fixedly connected in the first mounting hole (41), and the inner diameter of the first mounting hole (41) is larger than the outer diameter of the buffer column (2).
3. A buffer hydraulic cylinder according to claim 2, wherein the buffer sleeve (5) is slidably connected in the second mounting hole (42), and a circlip (9) for limiting the buffer sleeve (5) is detachably connected in the second mounting hole (42).
4. A buffer hydraulic cylinder according to claim 3, characterized in that the circlip (9) is located in the second mounting hole (42) on the side close to the cylinder bottom (1), and the buffer sleeve (5) is located on the side of the circlip (9) away from the cylinder bottom (1).
5. A damping hydraulic cylinder according to claim 2, characterised in that the outer diameter of the damping bush (5) is not smaller than the inner diameter of the first mounting hole (41), and the outer diameter of the damping bush (5) is smaller than the inner diameter of the second mounting hole (42).
6. A damping oil cylinder according to claim 2, characterised in that the end of the damping oil channel (21) remote from the cylinder bottom (1) communicates with the first mounting hole (41).
7. The damping hydraulic cylinder according to claim 1, characterized in that the damping sleeve (5) has at least one oil groove (51) radially formed at its end close to the cylinder bottom (1).
8. Buffer hydraulic cylinder according to claim 7, characterized in that the oil grooves (51) are provided with four and evenly arranged.
9. The buffer hydraulic oil cylinder according to claim 1, wherein the periphery of the piston (4) is clamped with a sealing ring (7) and a support ring (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920926580.5U CN210715357U (en) | 2019-06-19 | 2019-06-19 | Buffer hydraulic oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920926580.5U CN210715357U (en) | 2019-06-19 | 2019-06-19 | Buffer hydraulic oil cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210715357U true CN210715357U (en) | 2020-06-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920926580.5U Active CN210715357U (en) | 2019-06-19 | 2019-06-19 | Buffer hydraulic oil cylinder |
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| CN (1) | CN210715357U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114962388A (en) * | 2022-07-29 | 2022-08-30 | 江苏恒立液压股份有限公司 | Buffer piston and oil cylinder with same |
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2019
- 2019-06-19 CN CN201920926580.5U patent/CN210715357U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114962388A (en) * | 2022-07-29 | 2022-08-30 | 江苏恒立液压股份有限公司 | Buffer piston and oil cylinder with same |
| CN114962388B (en) * | 2022-07-29 | 2022-12-23 | 江苏恒立液压股份有限公司 | Buffer piston and oil cylinder with same |
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