A cylinder pressing tool and an oil cylinder with a pressing structure

Abstract

A cylinder buckling tool, comprising an outer sleeve and an inner sleeve, the outer sleeve is provided with a hydraulic cavity, a guide hole and an assembly hole, the inner sleeve is slidingly inserted into the guide hole, and the inner sleeve is provided with an inner hole along the axial direction, one end of the inner sleeve is provided with a piston body and the other end is provided with a taper sleeve, the piston body is slidingly fitted in the hydraulic cavity, the outer sleeve is provided with an inlet hole and an outlet hole, the hole wall of the assembly hole is provided with a sliding hole along the radial direction, and a buckling block is slidingly inserted into the sliding hole; the above scheme drives the piston body through the hydraulic cavity of the outer sleeve, and then the piston body drives the inner sleeve and the taper sleeve to move, so that the buckling block radially extrudes the cylinder in the assembly hole, so that the cylinder barrel and the cylinder bottom are tightly combined after being extruded and deformed. The application also provides an oil cylinder with a buckling structure processed by the cylinder buckling tool, so that the cylinder barrel and the cylinder bottom can realize high connection strength, good hydraulic bearing performance, high processing efficiency, stable and reliable quality and other processing requirements.

Description

Technical Field

[0001] This invention relates to the technical field of machining tooling, and more specifically to a cylinder pressing tooling, and a hydraulic cylinder with a pressing structure processed by the cylinder pressing tooling. Background Technology

[0002] Hydraulic cylinders are common drive components, and their cylinder bodies typically consist of a cylinder barrel and a cylinder bottom for sealing the bottom of the cylinder barrel. To ensure that the cylinder body can withstand high fluid pressures during operation without leakage or damage, a stable and reliable connection between the cylinder barrel and the cylinder bottom must be ensured. Currently, the industry mainly uses welding or bolting to connect the cylinder barrel and cylinder bottom, that is, the mating parts of the cylinder barrel and cylinder bottom are connected and fixed through welding processes or bolted structures.

[0003] However, welding the cylinder block to the cylinder bottom places strict requirements on the materials used. For materials with poor weldability, such as high-carbon steel, stainless steel, and aluminum profiles, welding often presents challenges such as difficult welding operations, high skill requirements for operators, and inconsistent weld quality, severely reducing the structural strength and sealing performance of the cylinder block. Conversely, if a threaded connection is used between the cylinder block and cylinder bottom, the connection strength is limited by the structure of the threaded pair, often resulting in constrained strength. Summary of the Invention

[0004] The purpose of this invention is to provide a cylinder block crimping fixture, and a hydraulic cylinder with a crimping structure processed using the cylinder block crimping fixture, thereby achieving both high connection strength between the cylinder barrel and the cylinder bottom, good hydraulic load-bearing performance, and meeting the processing requirements of high processing efficiency and stable and reliable quality.

[0005] To solve the above problems, the present invention provides a cylinder block crimping fixture, including an outer sleeve and an inner sleeve. The outer sleeve is provided with a hydraulic cavity and a guide hole and an assembly hole parallel to the axis. The inner sleeve is slidably inserted into the guide hole, and the inner sleeve has an inner hole coaxial with the assembly hole along the axial direction. One end of the inner sleeve is provided with a piston body and the other end is provided with a tapered sleeve. The piston body is slidably fitted in the hydraulic cavity and divides the hydraulic cavity into a front half and a rear half. The outer sleeve is provided with an inlet hole communicating with the front half of the hydraulic cavity and an outlet hole communicating with the rear half of the hydraulic cavity. The wall of the assembly hole is provided with a sliding hole along the radial direction, and a crimping block is slidably inserted into the sliding hole. The tapered sleeve is provided with a guide slope that slides against the crimping block. The inner hole and assembly hole are used to accommodate the cylinder body to be processed. When liquid is filled into the front half of the hydraulic chamber through the inlet hole, the piston body drives the inner sliding sleeve to move backward along the axis, and then the tapered sleeve pushes the pressing block to squeeze the cylinder body through the guide slope. When liquid is filled into the rear half of the hydraulic chamber through the outlet hole, the piston body drives the inner sliding sleeve to move forward along the axis, and then the guide slope of the tapered sleeve no longer applies pressure to the pressing block, so that the cylinder body can be taken out from the assembly hole.

[0006] Compared with existing technologies, the above solution designs an outer sleeve and an inner sliding sleeve. The piston body is driven by the hydraulic chamber of the outer sleeve, and then the piston body drives the inner sliding sleeve and the tapered sleeve to move. This causes the pressing block to radially press the cylinder body in the assembly hole, so that the cylinder barrel and cylinder bottom are compressed and deformed and tightly joined together. This achieves cold working without welding and completely avoids the problems of cylinder barrel thermal deformation and stress concentration caused by welding. At the same time, the pressing can be completed in one action by the hydraulic chamber driving the piston body, which significantly improves the production efficiency compared with the welding process. Moreover, the pressing force applied by the pressing block to the cylinder body is uniform and stable, ensuring the consistency of the cylinder body processing quality.

[0007] In an improved embodiment, the outer sleeve includes a cylindrical body and a front partition and a rear partition arranged axially spaced within the cylindrical body. The front and rear partitions each have guide holes for the inner sliding sleeve to slide into. The hydraulic chamber is formed by the front partition, the rear partition, the inner circumferential wall of the cylindrical body, and the outer circumferential wall of the inner sliding sleeve. The piston body is located between the front and rear partitions. The hydraulic chamber is formed by the front and rear partitions together with the cylindrical body and the inner sliding sleeve, resulting in a compact structure and reliable sealing. Furthermore, the sliding engagement of the inner sliding sleeve with the guide holes of the front and rear partitions ensures the stability of the inner sliding sleeve during axial movement.

[0008] In an improved embodiment, sealing rings are provided between the guide hole of the front partition and the inner sliding sleeve, and between the guide hole of the rear partition and the inner sliding sleeve. These sealing rings effectively prevent fluid leakage from the hydraulic chamber through the gap between the inner sliding sleeve and the guide hole, ensuring the stability of the hydraulic force, while also preventing fluid contamination of the working environment and improving the long-term reliability of the tooling.

[0009] In an improved embodiment, the cylinder body is further provided with a base, which is spaced apart on one side of the rear partition away from the front partition. A gap is provided between the base and the inner sliding sleeve to allow for axial movement of the inner sliding sleeve. The assembly hole is located in the middle of the base. The assembly hole is located on a separately positioned base, facilitating machining and replacement after wear, thus reducing maintenance costs. The gap between the base and the inner sliding sleeve provides limiting and movement space for the axial movement of the inner sliding sleeve.

[0010] In an improved embodiment, the guide ramp is the wall of a tapered hole in the tapered sleeve, the diameter of which gradually increases from front to back. Multiple sliding holes are distributed circumferentially along the mounting hole on the base, and a clamping block is slidably inserted into each sliding hole. The multiple clamping blocks distributed circumferentially along the mounting hole can simultaneously apply uniform radial pressure to the entire circumference of the cylinder, ensuring complete engagement between the cylinder barrel and the cylinder bottom. The guide ramp, being the wall of the tapered hole on the tapered sleeve, has a simple structure and allows all clamping blocks to be pushed synchronously when the tapered sleeve moves.

[0011] In an improved embodiment, the base is equipped with springs corresponding to each clamping block. These springs abut against the respective clamping blocks and apply a thrust away from the mounting hole. After clamping is complete and the inner sleeve returns to its forward position, the springs automatically push the clamping blocks away from the cylinder surface, preventing jamming between the clamping blocks and the cylinder. This facilitates quick removal of the machined cylinder, further improving production cycle time and operational convenience.

[0012] In an improved embodiment, the outer peripheral wall of the conical sleeve slides against the cylinder body at a position between the rear partition and the base. This sliding engagement between the outer peripheral wall of the conical sleeve and the inner wall of the cylinder body provides auxiliary guidance for the axial movement of the conical sleeve, making its movement smoother and preventing radial swaying caused by the reaction force of the clamping block during the clamping process.

[0013] In an improved embodiment, the outer sleeve is provided with a spring acting on the clamping block. The spring applies a thrust to the clamping block away from the mounting hole. After clamping is completed and the inner sleeve returns to its forward position, the spring automatically pushes the clamping block away from the cylinder surface, preventing the clamping block from jamming with the cylinder. This facilitates the quick removal of the machined cylinder, further improving production cycle time and operational convenience.

[0014] The present invention also provides a hydraulic cylinder with a clamping structure, using the cylinder clamping fixture described above. The hydraulic cylinder with the clamping structure includes a cylinder barrel and a cylinder bottom. The cylinder bottom is inserted into one end of the cylinder barrel, and the cylinder barrel is inserted into the inner hole of the inner sliding sleeve. The bottom end of the cylinder barrel is located in the assembly hole of the outer sleeve. The cylinder barrel is deformed by the compression of the clamping block to achieve a tight fit with the cylinder bottom.

[0015] The hydraulic cylinder with a clamping structure described above uses a clamping block of a cylinder clamping fixture to press the bottom end of the cylinder barrel, so that the cylinder barrel can be tightly connected to the cylinder bottom through deformation. After testing, the hydraulic pressure that the cylinder bottom can withstand relative to the cylinder barrel can reach more than 50MPa, which has excellent pressure bearing performance. Moreover, it is easy to process, has high efficiency, and reliable and stable processing quality.

[0016] Furthermore, the cylinder barrel is preferably made of aluminum. Aluminum has advantages such as light weight and corrosion resistance, which ensures good reliability of the cylinder barrel while achieving a lightweight cylinder body. Attached Figure Description

[0017] Figure 1 A schematic cross-sectional view of a hydraulic cylinder with a snap-fit ​​structure. Figure 2 A schematic diagram of a cylinder block crimping tool; Figure 3 This is a top view schematic diagram of a cylinder block crimping tool; Figure 4 For along Figure 3 Cross-sectional view of section AA in the middle; Figure 5 For along Figure 4 Schematic diagram of the BB section line.

[0018] Explanation of reference numerals in the attached figures. 1. Outer sleeve; 11. Cylinder body; 111. Hydraulic chamber; 112. Inlet hole; 113. Outlet hole; 12a. Front partition; 12b. Rear partition; 121. Guide hole; 122. Sealing ring; 13. Base; 131. Assembly hole; 132. Sliding hole; 133. Spring; 2. Inner sliding sleeve; 21. Inner hole; 3. Piston body; 4. Tapered sleeve; 41. Tapered hole; 5. Clamping block; 6. Cylinder body; 61. Cylinder barrel; 62. Cylinder bottom. Detailed Implementation

[0019] It should be understood by those skilled in the art that the following embodiments are merely illustrative of the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0020] In the following description of the embodiments, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0021] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0022] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] Example 1 Please see Figures 1-5 The cylinder pressing fixture provided in Embodiment 1 of the present invention includes an outer sleeve 1 and an inner sliding sleeve 2. The outer sleeve 1 is provided with a hydraulic cavity 111 and a guide hole 121 and an assembly hole 131 parallel to the axis. The inner sliding sleeve 2 is slidably inserted into the guide hole 121, and the inner sliding sleeve 2 is provided with an inner hole 21 coaxial with the assembly hole 131 along the axial direction. One end of the inner sliding sleeve 2 is provided with a piston body 3 and the other end is provided with a tapered sleeve 4. The piston body 3 is slidably fitted in the hydraulic cavity 111 and divides the hydraulic cavity 111 into a front half and a rear half. The outer sleeve 1 is provided with an inlet hole 112 communicating with the front half of the hydraulic cavity 111 and an outlet hole 113 communicating with the rear half of the hydraulic cavity 111. The wall of the assembly hole 131 is provided with a sliding hole 132 along the radial direction, and a pressing block 5 is slidably inserted in the sliding hole 132. The tapered sleeve 4 is provided with a guide slope that slides against the pressing block 5. When the above scheme is used, the cylinder body 6 to be processed is inserted into the inner hole 21 and the assembly hole 131, and the joint position of the cylinder barrel 61 and the cylinder bottom 62 of the cylinder body 6 is located in the assembly hole 131. When liquid is filled into the front half of the hydraulic chamber 111 through the inlet hole 112, the piston body 3 drives the inner sliding sleeve 2 to move backward along the axis, and then the cone sleeve 4 pushes the clamping block 5 through the guide slope to squeeze the cylinder body 6, so that the cylinder barrel 61 and the cylinder bottom 62 of the cylinder body 6 are squeezed and deformed and tightly joined together; when liquid is filled into the rear half of the hydraulic chamber 111 through the outlet hole 113, the piston body 3 drives the inner sliding sleeve 2 to move forward along the axis, and then the guide slope of the cone sleeve 4 no longer applies pressure to the clamping block 5, so that the cylinder body 6 can be taken out from the assembly hole 131.

[0024] The above solution designs an outer sleeve 1 and an inner sliding sleeve 2. The piston body 3 is driven by the hydraulic chamber 111 of the outer sleeve 1. In turn, the piston body 3 drives the inner sliding sleeve 2 and the cone sleeve 4 to move, so that the pressing block 5 radially presses the cylinder body 6 in the assembly hole 131. This makes the cylinder barrel 61 and the cylinder bottom 62 of the cylinder body 6 tightly joined together after being compressed and deformed, realizing cold working without welding. This completely avoids the problems of thermal deformation and stress concentration of the cylinder barrel 61 caused by welding. At the same time, the pressing can be completed in one action by the hydraulic chamber 111 driving the piston body 3, which significantly improves the production efficiency compared with the welding process. Moreover, the pressing force applied by the pressing block 5 to the cylinder body 6 is uniform and stable, ensuring the consistency of the processing quality of the cylinder body 6.

[0025] In this embodiment, the outer sleeve 1 includes a cylindrical body 11 and a front partition 12a and a rear partition 12b arranged axially within the cylindrical body 11. The front partition 12a and the rear partition 12b are respectively provided with guide holes 121 for sliding insertion of the inner sliding sleeve 2. The guide holes 121 of the front partition 12a and the rear partition 12b are arranged coaxially. The hydraulic cavity 111 is formed by the front partition 12a, the rear partition 12b, the inner peripheral wall of the cylindrical body 11, and the outer peripheral wall of the inner sliding sleeve 2. The piston body 3 is located between the front partition 12a and the rear partition 12b. The hydraulic cavity 111 is formed by the front partition 12a, the rear partition 12b, the cylindrical body 11, and the inner sliding sleeve 2, making the hydraulic cavity 111 compact and reliably sealed. The inner sliding sleeve 2 slides with the guide holes 121 of the front partition 12a and the rear partition 12b respectively, ensuring the stability of the inner sliding sleeve 2 during axial movement.

[0026] Furthermore, sealing rings 122 are provided between the guide hole 121 of the front partition 12a and the inner sliding sleeve 2, and between the guide hole 121 of the rear partition 12b and the inner sliding sleeve 2. The sealing rings 122 can effectively prevent the liquid in the hydraulic chamber 111 from leaking through the gap between the inner sliding sleeve 2 and the guide hole 121, ensuring the stability of the hydraulic force, while avoiding liquid contamination of the working environment and improving the reliability of the tooling during long-term operation.

[0027] In this embodiment, the front partition 12a and the rear partition 12b are located at the front and middle parts of the cylinder body 11, respectively. A base 13 is also provided at the rear of the cylinder body 11, specifically positioned on the side of the rear partition 12b opposite to the front partition 12a. A gap is provided between the base 13 and the inner sliding sleeve 2 for axial movement of the inner sliding sleeve 2. An assembly hole 131 is located in the middle of the base 13. The assembly hole 131 is located on the independently provided base 13, facilitating processing and replacement after wear, thus reducing maintenance costs. The gap between the base 13 and the inner sliding sleeve 2 provides a limit and movement space for the axial movement of the inner sliding sleeve 2. Of course, the base 13 and the cylinder body 11 can also be an integrated structure; this design does not limit this.

[0028] In this embodiment, the guide ramp is the wall of the tapered hole 41 in the tapered sleeve 4. The diameter of the tapered hole 41 gradually increases from front to back. Multiple sliding holes 132 are distributed circumferentially along the mounting hole 131 on the base 13. A clamping block 5 is slidably inserted into each sliding hole 132. The multiple clamping blocks 5 distributed circumferentially along the mounting hole 131 can simultaneously apply uniform radial pressure to the entire circumference of the cylinder 6, ensuring complete engagement between the cylinder 61 and the cylinder bottom 62. The guide ramp, being the wall of the tapered hole 41 on the tapered sleeve 4, has a simple structure and can synchronously push all the clamping blocks 5 when the tapered sleeve 4 moves. It should be understood that the guide ramp can also be multiple independently arranged inclined surfaces, which can also achieve the pushing effect on multiple clamping blocks 5, and are also part of this design concept. Furthermore, there is a gap between adjacent sliding holes 132, which should ensure that the clamping blocks 5 do not interfere when extending out of the sliding hole 132.

[0029] As an improvement to this embodiment, the base 13 is provided with springs 133 corresponding to each of the clamping blocks 5. The axis of the spring 133 is parallel to the axis of the sliding hole 132. One end of the spring 133 is connected to the base 13 and the other end abuts against the corresponding clamping block 5, and is used to apply a thrust away from the assembly hole 131. After clamping is completed and the inner sliding sleeve 2 returns to its forward position, the spring 133 can automatically push the clamping block 5 away from the surface of the cylinder body 6, avoiding jamming between the clamping block 5 and the cylinder body 6, facilitating the quick removal of the processed cylinder body 6, and further improving the production cycle and operational convenience. Of course, the spring 133 can also be directly set on the cylinder body 11, as long as it can apply a thrust away from the assembly hole 131 to the clamping block 5. The specific setting method is not limited in this design.

[0030] In this embodiment, the outer peripheral wall of the cone sleeve 4 slides against the cylindrical body 11 at the position between the rear partition 12b and the base 13. The sliding fit between the outer peripheral wall of the cone sleeve 4 and the inner wall of the cylindrical body 11 provides auxiliary guidance for the axial movement of the cone sleeve 4, making its movement more stable and preventing the cone sleeve 4 from radially deflecting due to the reaction force of the clamping block 5 during the clamping process.

[0031] Example 2 Combination Figure 1 As shown, Embodiment 2 of the present invention provides a hydraulic cylinder with a clamping structure, using the cylinder clamping fixture described in Embodiment 1. The hydraulic cylinder with the clamping structure includes a cylinder barrel 61 and a cylinder bottom 62. The cylinder bottom 62 is inserted into one end of the cylinder barrel 61, and the cylinder barrel 61 is inserted into the inner hole of the inner sliding sleeve. The bottom end of the cylinder barrel 61 is located in the assembly hole of the outer sleeve. The cylinder barrel 61 is deformed by the compression of the clamping block to achieve a tight fit with the cylinder bottom 62.

[0032] The hydraulic cylinder with a clamping structure in the above scheme uses the clamping block 5 of the cylinder clamping fixture to squeeze the bottom end of the cylinder barrel 61, so that the cylinder barrel 61 achieves a tight connection with the cylinder bottom 62 through deformation. After testing, the hydraulic pressure that the cylinder bottom 62 can withstand relative to the cylinder barrel 61 can reach more than 50MPa, which has excellent pressure bearing performance. Moreover, it is easy to process, has high efficiency, and reliable and stable processing quality.

[0033] Furthermore, the cylinder barrel 61 is preferably made of aluminum. Aluminum has advantages such as light weight and corrosion resistance, which ensures the cylinder barrel 61 has good reliability while achieving a lightweight cylinder body 6.

[0034] It should be noted that in the description of this application, the terms "inner" and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application. All directional indications (such as up, down, left, right, front, back, inner, and outer) are only used to explain the relative positional relationships and movement between components in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0035] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0036] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A cylinder block pressing tool, characterized in that, The device includes an outer sleeve (1) and an inner sliding sleeve (2). The outer sleeve (1) is provided with a hydraulic chamber (111), a guide hole (121) and an assembly hole (131) parallel to the axis. The inner sliding sleeve (2) is slidably inserted into the guide hole (121), and the inner sliding sleeve (2) is provided with an inner hole (21) coaxial with the assembly hole (131) along the axial direction. One end of the inner sliding sleeve (2) is provided with a piston body (3) and the other end is provided with a tapered sleeve (4). The piston body (3) is slidably fitted into the hydraulic chamber. The hydraulic chamber (111) is divided into a front half and a rear half. The outer sleeve (1) is provided with an inlet hole (112) that connects to the front half of the hydraulic chamber (111) and an outlet hole (113) that connects to the rear half of the hydraulic chamber (111). The mounting hole (131) has a sliding hole (132) radially opened on the hole wall and a clamping block (5) is slidably inserted in the sliding hole (132). The tapered sleeve (4) is provided with a guide slope that slides against the clamping block (5). The inner hole (21) and the assembly hole (131) are used to accommodate the cylinder body (6) to be processed. When liquid is filled into the front half of the hydraulic chamber (111) through the inlet hole (112), the piston body (3) drives the inner sliding sleeve (2) to move backward along the axis, and then the cone sleeve (4) pushes the pressing block (5) to squeeze the cylinder body (6) through the guide slope. When liquid is filled into the rear half of the hydraulic chamber (111) through the outlet hole (113), the piston body (3) drives the inner sliding sleeve (2) to move forward along the axis, and then the guide slope of the cone sleeve (4) no longer applies pressure to the pressing block (5), so that the cylinder body (6) can be taken out from the assembly hole (131).

2. The cylinder block crimping fixture according to claim 1, characterized in that, The outer sleeve (1) includes a cylinder body (11) and a front partition (12a) and a rear partition (12b) arranged axially within the cylinder body (11). The front partition (12a) and the rear partition (12b) are respectively provided with guide holes (121) for the inner sliding sleeve (2) to slide into. The hydraulic cavity (111) is formed by the front partition (12a), the rear partition (12b), the inner peripheral wall of the cylinder body (11) and the outer peripheral wall of the inner sliding sleeve (2). The piston body (3) is located between the front partition (12a) and the rear partition (12b).

3. The cylinder block crimping fixture according to claim 2, characterized in that, A sealing ring (122) is provided between the guide hole (121) of the front partition (12a) and the inner sliding sleeve (2), and between the guide hole (121) of the rear partition (12b) and the inner sliding sleeve (2).

4. The cylinder block crimping fixture according to claim 2, characterized in that, The cylinder body (11) is also provided with a base (13), which is spaced apart on one side of the rear partition (12b) away from the front partition (12a), and there is a gap between the base (13) and the inner sliding sleeve (2) for the inner sliding sleeve (2) to move axially. The assembly hole (131) is opened in the middle of the base (13).

5. The cylinder block crimping fixture according to claim 4, characterized in that, The guide slope is the wall of the tapered hole (41) opened in the tapered sleeve (4). The diameter of the tapered hole (41) gradually increases from front to back. There are multiple sliding holes (132) distributed around the base (13) along the circumference of the assembly hole (131). Each sliding hole (132) is slidably inserted with a snap-fit ​​block (5).

6. The cylinder block crimping fixture according to claim 5, characterized in that, The base (13) is provided with springs (133) corresponding to each of the snapping blocks (5), the springs (133) abutting against the corresponding snapping blocks (5) and used to apply a thrust away from the mounting hole (131).

7. The cylinder block clamping fixture according to claim 4, 5, or 6, characterized in that, The outer peripheral wall of the cone sleeve (4) slides against the position of the cylinder body (11) between the rear partition (12b) and the base (13).

8. The cylinder block crimping fixture according to claim 1, characterized in that, The outer sleeve (1) is provided with a spring (133) acting on the snap-fit ​​block (5), the spring (133) being used to apply a thrust to the snap-fit ​​block (5) in a direction away from the mounting hole (131).

9. A hydraulic cylinder with a snap-fit ​​structure, using a cylinder snap-fit ​​fixture as described in any one of claims 1-8, wherein the hydraulic cylinder with the snap-fit ​​structure includes a cylinder barrel (61) and a cylinder bottom (62), the cylinder bottom (62) being inserted into one end of the cylinder barrel (61), the cylinder barrel (61) being inserted into the inner hole of the inner sliding sleeve, and the bottom end of the cylinder barrel (61) being located in the assembly hole of the outer sleeve; the cylinder barrel (61) is deformed by the squeezing of the snap-fit ​​block to achieve a tight fit with the cylinder bottom (62).

10. The cylinder block crimping fixture according to claim 9, characterized in that, The cylinder (61) is made of aluminum.

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