Buffering hydraulic cylinder with built-in oil way

Abstract

The utility model relates to a buffer hydraulic cylinder with a built-in oil way, which comprises a cylinder body, a hydraulic cylinder and a hydraulic cylinder, the piston is movably arranged in the cylinder body and divides the interior of the cylinder body into a rodless cavity and a rod cavity, a first oil hole communicated with the rodless cavity and an adjusting hole communicated with the first oil hole are formed in the piston, and the adjusting hole and the rear end cover are oppositely arranged; the piston rod is arranged on the piston and is provided with a third oil hole communicated with the rod cavity and a second oil hole communicated with the first oil hole; the buffer ring is movably arranged in the adjusting hole and is provided with a buffer hole; the buffer pin is detachably mounted on the rear end cover and is provided with a fourth oil hole communicated with the first oil hole and a fifth oil hole communicated with the adjusting hole and the fourth oil hole; wherein the buffering pin and the buffering hole are oppositely arranged, and buffering is achieved when the buffering pin is inserted into the buffering hole. According to the buffering hydraulic cylinder, the buffering gap is adjusted through the detachable buffering pin and the buffering ring capable of freely moving, the buffering effect can be controlled, and meanwhile the precision requirements for machining and assembling are lowered.

Description

Technical Field

[0001] The utility model relates to a cylinder block, in particular to an oil circuit built-in buffer hydraulic cylinder. Background Art

[0002] In order to achieve the buffer during retraction, a conventional cylinder block usually adopts a fixed buffer post cooperating with a buffer hole to achieve buffering through throttling. For example, a buffer cylinder block disclosed in CN103727095A includes a front end cover, a rear end cover and a cylinder block. An oil injection hole is provided on one side of the cylinder block. A piston rod is provided in the inner cavity of the cylinder block. A piston slidably matched with the inner cavity of the cylinder block is provided on the piston rod. The inner cavity of the cylinder block is divided into two parts by the piston. It is characterized in that a buffer post is provided on the central axis of the rear end cover, and a buffer hole slidably matched with the buffer post is provided at one end of the piston rod. The inner cavities of the cylinder block on both sides of the piston are communicated through the buffer hole. Although its structure is simple, its control over the buffer effect is not good, and the machining and assembly accuracy has a great influence on the buffer effect. In the case of high buffer requirements, it is necessary to control the machining accuracy of the buffer post and the buffer hole, and the length of the piston rod is relatively long, which leads to greater machining difficulty and high requirements for assembly accuracy. It is necessary to control the coaxiality between the buffer post and the buffer hole. Since the gap is small, precise control of the buffer cannot be achieved. Summary of the Utility Model

[0003] In order to solve the problem that the machining and assembly have a great influence on the buffer effect, the utility model provides an oil circuit built-in buffer hydraulic cylinder, which adjusts the buffer gap through a detachable buffer pin and a freely movable buffer ring, can not only control the buffer effect, but also reduce the accuracy requirements for machining and assembly. The specific technical solution is as follows:

[0004] An oil circuit built-in buffer hydraulic cylinder includes: a cylinder block, with a rear end cover fixedly provided at one end; a piston, movably arranged in the cylinder block, and dividing the interior of the cylinder block into a rodless cavity and a rod cavity. The piston is provided with a first oil hole communicating with the rodless cavity and an adjusting hole communicating with the first oil hole. The adjusting hole is arranged opposite to the rear end cover; a piston rod, arranged on the piston, and provided with a third oil hole communicating with the rod cavity and a second oil hole communicating with the first oil hole; a buffer ring, movably arranged in the adjusting hole, and provided with a buffer hole; and a buffer pin, detachably installed on the rear end cover, and provided with a fourth oil hole communicating with the first oil hole and a fifth oil hole communicating with both the adjusting hole and the fourth oil hole; wherein, the buffer pin is arranged opposite to the buffer hole, and buffering is achieved when the buffer pin is inserted into the buffer hole.

[0005] Preferably, the end of the buffer pin is provided with an insertion conical surface.

[0006] Preferably, it further includes a limiting device, arranged in the adjusting hole for restricting the buffer ring in the adjusting hole.

[0007] Compared with the prior art, the utility model has the following beneficial effects:

[0008] The buffer pin of an oil-way built-in buffer hydraulic cylinder provided by the utility model can be disassembled and assembled, which is convenient for disassembly and trimming. The buffer ring can move radially and axially, reducing the requirement for coaxiality during assembly, and also reducing the requirement for coaxiality in the processing of the buffer pin and the buffer ring, thus reducing the processing and assembly costs; the throttling gap can be adjusted by trimming the diameter of the buffer pin, thereby realizing the adjustment of the buffer effect. Description of the Drawings

[0009] Figure 1 is a schematic structural diagram of the present application;

[0010] Figure 2 is Figure 1 a partial enlarged view of part I in

[0011] Figure 3 a schematic diagram when the piston retracts. Detailed Embodiments

[0012] The present utility model will be further described below in conjunction with the accompanying drawings.

[0013] As Figures 1 to 3As shown in the figure, an oil circuit built-in buffer hydraulic cylinder includes a cylinder block 1, a piston 3, a piston rod 2, a buffer ring 6 and a buffer pin 5. One end of the cylinder block 1 is fixedly equipped with a rear end cover 14, and the other end is fixedly equipped with a front end cover 15. The piston 3 is movably inserted into the piston hole 11 of the cylinder block 1. The piston 3 divides the piston hole 11 into a rodless cavity 17 and a rod cavity 18. The rodless cavity 17 is located on one side of the rear end cover 14. At the end of the rodless cavity 17, the piston 3 is provided with an adjustment hole 32 and a number of oil through grooves 35 arranged in an annular array along the axis. The oil through grooves 35 communicate with the adjustment hole 32 and the rodless cavity 17. The adjustment hole 32 is a blind hole. At the bottom of the adjustment hole 32, there is a first oil hole 31. The diameter of the first oil hole 31 is smaller than that of the adjustment hole 32, forming a stepped hole with the same axis. One end of the piston rod 2 is fixedly connected to the piston 3, and the other end is provided with a second oil hole 22 and a third oil hole 23. The second oil hole 22 is arranged along the axis and communicates with the first oil hole 31. The third oil hole 23 communicates with the rod cavity 18. The center of the buffer ring 6 is provided with a buffer hole 61. The end face of the buffer ring 6 matches the bottom of the adjustment hole 32, capable of achieving end face sealing. The outer diameter of the buffer ring 6 is smaller than the inner diameter of the adjustment hole 32, and the width of the buffer ring 6 is smaller than the depth of the adjustment hole 32. The buffer ring 6 can move freely within the adjustment hole 32, that is, the buffer ring 6 can move radially, axially, and simultaneously radially and axially. The buffer pin 5 is installed on the rear end cover 14 by means of a thread, and a sealing ring is installed between the buffer pin 5 and the rear end cover 14. At the top of the buffer pin 5, there is a fourth oil hole 51. The fourth oil hole 51 is located on the center line of the buffer pin 5. There are a number of fifth oil holes 52 on the side of the buffer pin 5. The fifth oil holes 52 communicate with the fourth oil hole 51, and the fifth oil holes 52 also communicate with the adjustment hole 32. The buffer pin 5 is arranged opposite to the buffer hole 61 and the second oil hole 22, and buffering is achieved when the buffer pin 5 is inserted into the buffer hole 61.

[0014] The throttling adjustment is carried out by adjusting the gap between the buffer pin 5 and the buffer hole 61, and then the buffering effect can be adjusted. That is, the buffer pin 5 can be removed, and then the outer diameter of the buffer pin 5 can be trimmed to adjust the gap size between the buffer pin 5 and the buffer hole 61, thereby realizing the adjustment of the buffering effect.

[0015] Since the buffer ring 6 is movably installed in the adjustment hole 32, it is not necessary to adjust the coaxiality between the buffer ring 6 and the buffer pin 5 during assembly. The buffer ring 6 can adapt to the buffer pin 5, that is, when the piston rod 2 retracts, the buffer ring 6 can automatically align with the buffer pin 5, well eliminating the influence brought by the coaxiality error, greatly reducing the precision requirements for processing and assembly, and reducing the cost. Since the buffer pin 5 can be disassembled, the adverse factors in the early production and processing can be eliminated, and a better buffering effect can be achieved.

[0016] In order to facilitate the alignment of the buffer hole 61 and the buffer pin 5 , an insertion cone 53 is provided at the end of the buffer pin 5 . The insertion cone 53 can automatically guide the buffer ring 6 to move automatically to prevent the buffer pin 5 from squeezing the buffer ring 6 .

[0017] In addition, the starting speed of the oil cylinder can be adjusted by changing the diameter of the fifth oil hole 52 .

[0018] The buffer pin 5 has a simple structure, is easy to assemble and disassemble, and has good maintainability.

[0019] In order to prevent the buffer ring 6 from escaping from the adjustment hole 32 , a limiting device 7 is installed in the adjustment hole 32 . The limiting device 7 includes a retaining spring or a nut, etc. The limiting device 7 does not affect the movement of the buffer ring 6 , and can prevent the buffer ring 6 from escaping from the adjustment hole 32 .

[0020] The sealing ring of the buffer pin 5 realizes the sealing between the buffer pin 5 and the rear end cover 14 .

[0021] When the piston 3 is retracted to the buffer hole 61 where the buffer pin 5 is inserted into the buffer ring 6, the hydraulic oil enters the second oil hole 22 through the gap between the buffer pin 5 and the buffer hole 61, and the hydraulic oil is throttled, thereby realizing the buffering of the retraction of the piston 3 and the piston rod 2. The throttled hydraulic oil enters the second oil hole 22 through the first oil hole 31. At this time, the hydraulic oil can also enter the first oil hole 31 through the first gap 33 between the outer circumference of the buffer ring 6 and the inner circumference of the adjustment hole 32 and the second gap 34 between the end of the buffer ring 6 and the bottom of the adjustment hole 32. When the tapered end of the buffer pin 5 completely enters the buffer hole 61, as the gap between the buffer pin 5 and the buffer hole 61 becomes smaller, the pressure on the buffer ring 6 to the bottom of the adjustment hole 32 increases, and the buffer ring 6 will be pressed against the bottom of the adjustment hole 32, thereby eliminating the second gap 34, so that the hydraulic oil can only flow through the gap between the buffer pin 5 and the buffer hole 61, further improving the buffering effect, making the entire buffering process smoother and more stable, close to linear buffering.

[0022] In addition, the built-in oil circuit can reduce the footprint of the hydraulic cylinder.

[0023] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the claims of the present invention.

Claims

1. A hydraulic cylinder with built-in oil circuit, characterized in that: include: A cylinder body (1) has a rear end cover (14) fixedly disposed at one end; A piston (3) is movably disposed in the cylinder body (1) and divides the interior of the cylinder body (1) into a rodless chamber (17) and a rod chamber (18); the piston (3) is provided with a first oil hole (31) communicating with the rodless chamber (17) and an adjustment hole (32) communicating with the first oil hole (31); the adjustment hole (32) is arranged opposite to the rear end cover (14); A piston rod (2) is disposed on the piston (3) and is provided with a third oil hole (23) communicating with the rod chamber (18) and a second oil hole (22) communicating with the first oil hole (31); a buffer ring (6) movably disposed in the adjustment hole (32) and provided with a buffer hole (61); and A buffer pin (5) is detachably mounted on the rear end cover (14) and is provided with a fourth oil hole (51) communicating with the first oil hole (31) and a fifth oil hole (52) communicating with both the adjustment hole (32) and the fourth oil hole (51); The buffer pin (5) is arranged opposite to the buffer hole (61), and buffering is achieved when the buffer pin (5) is inserted into the buffer hole (61).

2. The hydraulic cylinder with built-in oil circuit according to claim 1, characterized in that: An insertion cone (53) is provided at the end of the buffer pin (5).

3. The hydraulic cylinder with built-in oil circuit according to claim 1, characterized in that: It also includes a limiting device (7) which is arranged in the adjusting hole (32) and is used to limit the buffer ring (6) in the adjusting hole (32).

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