Piston connection structure for oil cylinder

Abstract

The utility model discloses a kind of piston connecting structures for oil cylinder, including cylinder body and the piston rod placed in cylinder body, piston is equipped on piston rod, cylinder body right end is equipped with end cover;One end is equipped with fixed column on piston rod, fixed column is equipped with piston, the diameter of fixed column is less than the diameter of piston rod;Baffle is equipped on piston rod at the junction of fixed column and piston rod;T type sleeve is equipped on the right side of piston, T type sleeve is sleeve and bottom plate composition;Bottom plate and piston end face are fixedly connected by bolt, external thread is equipped on fixed column, sleeve is rotatably connected with fixed column by thread. The utility model can effectively fix piston by T type sleeve, and simultaneously, piston can be driven out by rotating T type sleeve, to avoid disassembling piston rod to improve replacement efficiency.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder manufacturing, and in particular to a piston connection structure for hydraulic cylinders. Background Technology

[0002] In the field of hydraulic cylinder piston connection structure, traditional pistons and piston rods mostly adopt interference fit or integral connection. When disassembling, the piston rod must be completely disassembled to remove the piston, which is cumbersome and easily damages the cylinder wall. At the same time, when the piston and cylinder body are in close contact without disassembling the piston rod, there is no convenient separation mechanism. Disassembly requires forcibly prying to pull out the piston, which is not only inefficient, but also aggravates the wear of parts. Utility Model Content

[0003] The purpose of this invention is to provide a piston connection structure for hydraulic cylinders that facilitates piston replacement.

[0004] The purpose of this utility model is achieved as follows: a piston connection structure for a hydraulic cylinder includes a cylinder body and a piston rod placed inside the cylinder body, a piston is provided on the piston rod, and an end cap is provided at the right end of the cylinder body;

[0005] A fixed post is provided at one end of the piston rod, and a piston is provided on the fixed post. The diameter of the fixed post is smaller than the diameter of the piston rod. A baffle is provided on the piston rod at the junction of the fixed post and the piston rod. A T-shaped sleeve is provided on the right side of the piston. The T-shaped sleeve is composed of a sleeve and a base plate. The base plate is fixedly connected to the piston end face by bolts. The fixed post is provided with external threads, and the sleeve is rotatably connected to the fixed post by the threads.

[0006] Preferably, the piston has a triangular protrusion on the end face facing the piston rod; the main body of the fixing post at the junction of the fixing post and the piston rod is recessed inward and has a triangular groove, and the triangular protrusion and the triangular groove are fitted together.

[0007] Preferably, the fixed column is provided with a first step, a second step and a third step from left to right, the piston inner diameter surface is provided with a two-stage diameter changing channel, the two-stage diameter changing channel matches the first step and the second step on the fixed column, and the T-shaped sleeve is sleeved on the third step.

[0008] Preferably, the outer periphery of the sleeve is shaped like a nut.

[0009] Preferably, when the left end face of the piston abuts against the baffle, the bottom plate of the T-shaped sleeve does not abut against the junction of the second and third steps; when the T-shaped sleeve disengages from the third step, more than half of the piston body disengages from the cylinder.

[0010] Compared with the prior art, the advantages of this utility model are:

[0011] 1. By connecting the piston to the T-shaped sleeve, the sleeve can be rotated directly to drive the piston to rotate and separate from the cylinder, which solves the problem of the traditional piston and cylinder being too tightly in contact and difficult to separate. There is no need to go deep into the cylinder or disassemble the piston rod, which greatly improves the disassembly efficiency.

[0012] 2. The triangular protrusion and the triangular groove are embedded to form the first mechanical seal. The matching of multiple steps and the secondary diameter changing channel creates multiple sealing surfaces. The axial compression of the T-shaped sleeve is superimposed to form a multi-layer seal, which has a higher sealing performance than the traditional single seal structure. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] The components include: 1. Cylinder block; 2. Piston rod; 201. Baffle plate; 3. Piston; 301. Triangular protrusion; 302. Secondary diameter changing channel; 4. End cover; 5. Fixing post; 6. T-type sleeve; 7. Bolt; 501. Triangular groove; 502. First step; 503. Second step; 504. Third step; 6. T-type sleeve; 601. Sleeve; 602. Base plate; 7. Bolt. Detailed Implementation

[0015] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0016] It should be noted that in the description of this utility model, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. These terms are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. The terms "horizontal," "vertical," and "suspended," etc., do not indicate that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0017] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0018] like Figure 1 As shown, a piston connection structure for a hydraulic cylinder includes a cylinder body 1 and a piston rod 2 placed inside the cylinder body 1. A piston 3 is provided on the piston rod 2, and an end cap 4 is provided at the right end of the cylinder body 3.

[0019] A fixed post 5 is provided at one end of the piston rod 2, and a piston 3 is provided on the fixed post 5. The diameter of the fixed post 5 is smaller than the diameter of the piston rod 2. A baffle 201 is provided on the piston rod 2 at the junction of the fixed post 5 and the piston rod 2. A T-shaped sleeve 6 is provided on the right side of the piston 3. The T-shaped sleeve 6 is composed of a sleeve 601 and a base plate 602. The base plate 602 is fixedly connected to the end face of the piston 2 by bolts 7. The fixed post 5 is provided with external threads, and the sleeve 601 is rotatably connected to the fixed post 5 by the threads.

[0020] like Figure 1 As shown, a triangular protrusion 301 is provided on the end face of the piston 3 facing the piston rod 2; a triangular groove 501 is provided inwardly on the main body of the fixed column 5 at the junction of the fixed column 5 and the piston rod 2. The triangular protrusion 301 and the triangular groove 501 are embedded and matched. High sealing can be achieved through the matching of the triangular groove and the triangular protrusion, and at the same time through the compression of the T-shaped sleeve, so as to avoid leakage.

[0021] like Figure 1 As shown, the fixed column 5 is provided with a first step 502, a second step 503, and a third step 504 from left to right. The inner diameter surface of the piston 3 is provided with a two-stage variable diameter channel 302. The two-stage variable diameter channel 302 matches the first step 502 and the second step 503 on the fixed column. The T-shaped sleeve 6 is fitted on the third step 504. Through the design of multiple steps, multiple sealing surfaces can be formed to improve the overall sealing performance.

[0022] like Figure 1 As shown, the outer periphery of the sleeve 601 is nut-shaped. Since the piston is in close contact with the inner wall of the cylinder, the piston can be rotated and dislodged from the cylinder by rotating the sleeve, making it easier for the piston to detach from the cylinder and greatly improving the disassembly efficiency.

[0023] like Figure 1As shown, when the left end face of piston 3 abuts against baffle 201, the bottom plate 602 of T-sleeve 6 does not abut against the junction of the second step 503 and the third step 504. The gap is reserved for the piston to compress, ensuring that the piston can be compressed and improving the sealing performance. When T-sleeve 6 separates from the third step 504, more than half of the main body of piston 3 is separated from cylinder 1. After half of the main body is separated from the cylinder, the remaining separation can be quickly completed by shaking using the external space of the cylinder, without the need to go deep into the cylinder for operation.

[0024] The working principle of this utility model is explained as follows: The piston is positioned by being embedded in the triangular groove of the fixed column through a triangular protrusion, and its left side abuts against the baffle plate; the sleeve of the T-shaped sleeve is threadedly connected to the fixed column, and the base plate is fixed to the piston by bolts, forming multiple sealing surfaces by squeezing the piston. During disassembly, loosening the T-shaped sleeve causes the piston to rotate and detach from the cylinder. After partial detachment, shaking can completely separate the piston, achieving efficient disassembly and leak prevention.

[0025] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the claims.

Claims

1. A piston connection structure for a hydraulic cylinder, comprising a cylinder body and a piston rod disposed within the cylinder body, wherein a piston is mounted on the piston rod, and an end cap is provided at the right end of the cylinder body; characterized in that, A fixed post is provided at one end of the piston rod, and a piston is provided on the fixed post. The diameter of the fixed post is smaller than the diameter of the piston rod. A baffle is provided on the piston rod at the junction of the fixed post and the piston rod. A T-shaped sleeve is provided on the right side of the piston. The T-shaped sleeve is composed of a sleeve and a base plate. The base plate is fixedly connected to the piston end face by bolts. The fixed post is provided with external threads, and the sleeve is rotatably connected to the fixed post by the threads.

2. The piston connection structure for a hydraulic cylinder according to claim 1, characterized in that: The piston has a triangular protrusion on the end face facing the piston rod; the main body of the fixing post at the junction of the fixing post and the piston rod is recessed inward and has a triangular groove, and the triangular protrusion and the triangular groove are fitted together.

3. The piston connection structure for a hydraulic cylinder according to claim 1, characterized in that: The fixed column is provided with a first step, a second step and a third step from left to right. The piston inner diameter surface is provided with a two-stage diameter changing channel. The two-stage diameter changing channel matches the first step and the second step on the fixed column. The T-shaped sleeve is fitted on the third step.

4. The piston connection structure for a hydraulic cylinder according to claim 1, characterized in that: The outer periphery of the sleeve is shaped like a nut.

5. The piston connection structure for a hydraulic cylinder according to claim 1, characterized in that: When the left end face of the piston abuts against the baffle, the bottom plate of the T-shaped sleeve does not abut against the junction of the second and third steps; when the T-shaped sleeve disengages from the third step, more than half of the piston body disengages from the cylinder.

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