Cylinder body and base press fitting device of oil cylinder

Abstract

The invention relates to the technical field of oil cylinder assembling equipment, and provides an oil cylinder body and base press-fitting device which comprises a press-fitting driving unit, a cylinder body righting tool and a base positioning tool which are sequentially arranged from top to bottom. The output end of the press-fitting driving unit is connected with the cylinder body righting tool; the cylinder body straightening tool comprises a core rod, the upper portion of the core rod is provided with a straightening convex ring which protrudes outwards, the lower end of the core rod is elastically connected with an inner positioning connector which is coaxially arranged, the inner positioning connector can vertically move relative to the core rod, and the inner positioning connector is provided with an inner profiling positioning face matched with an inner cavity of the base; the base positioning tool comprises an outer righting sleeve and a base body which are fixedly connected from top to bottom, the outer righting sleeve is used for positioning the periphery of a sleeving part at the bottom of the cylinder body, and the base body is provided with an outer profiling positioning face matched with the outline of the lower portion of the base. The cylinder press-fitting device overcomes the defects in the prior art, is reasonable in design and convenient in press-fitting, and solves the technical problems of low cylinder press-fitting efficiency and poor precision in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil cylinder assembly equipment, in particular to a cylinder body and base pressing device of an oil cylinder. BACKGROUND

[0002] An oil cylinder, as shown in the figure, the cylinder body P1 needs to be pressed down and combined to the outer periphery of the base P2, and the cylinder body P1 and the base P2 are in interference fit. Figure 1 In the prior art, the staff generally presses by hand, but manual operation is difficult to ensure assembly accuracy in large-scale and rapid production process, so that the sealing performance of the cylinder body and the base is difficult to guarantee, and the work efficiency is low.

[0003] Therefore, we propose a cylinder body and base pressing device of an oil cylinder. SUMMARY

[0004] In view of the shortcomings of the prior art, the present application provides a cylinder body and base pressing device of an oil cylinder, which overcomes the shortcomings of the prior art, is reasonable in design, convenient to press, and solves the technical problems of low cylinder pressing efficiency and poor precision in the prior art.

[0005] To achieve the above purpose, the present application is realized by the following technical scheme:

[0006] A cylinder body and base pressing device of an oil cylinder, characterized by comprising a pressing driving unit, a cylinder righting tool and a base positioning tool arranged in sequence from top to bottom.

[0007] The output end of the pressing driving unit is connected to the cylinder righting tool and is used to drive the cylinder righting tool to move vertically.

[0008] The cylinder righting tool comprises a core rod, the upper part of the core rod is provided with an outwardly protruding righting protruding ring, the lower end of the core rod is elastically connected with an inner positioning connector arranged coaxially, the inner positioning connector can move vertically relative to the core rod, and the inner positioning connector is provided with an inner profiled positioning surface matched with the inner cavity of the base.

[0009] The base positioning tool comprises an outer righting sleeve and a seat body fixed in sequence from top to bottom, the outer righting sleeve is used to position the outer periphery of the sleeving part at the bottom of the cylinder body, and the seat body is provided with an outer profiled positioning surface matched with the lower part of the base.

[0010] Further, the pressing driving unit is an electric cylinder, the cylinder body of the electric cylinder is fixed on the electric cylinder mounting seat, the piston rod of the electric cylinder extends downward and is connected to the cylinder righting tool.

[0011] Further, the cylinder righting tool comprises a support, a rotating connector, a core rod connector, a supporting vertical plate, a swing arm and a swing cylinder.

[0012] The support is installed at the output end of the pressing driving unit, the rotating joint is rotatably supported on the support through a rotating shaft, the bottom of the rotating joint is fixedly connected with a core rod joint, and the core rod joint is detachably connected with a core rod.

[0013] The support vertical plate is installed at the side of the support, the bottom of the cylinder body of the swing cylinder is rotatably connected with the support vertical plate, the lower end of the piston rod of the swing cylinder is rotatably connected with the swing arm, and the swing arm is fixedly connected with the side of the rotating joint.

[0014] The output end of the pressing driving unit is sequentially connected with a pressure sensor, a transmission joint and a lifting plate, the support is fixed below the lifting plate, and the support vertical plate is fixed at the side of the lifting plate.

[0015] Further, the seat body comprises an upper seat body and a lower seat body, the upper seat body is fixedly connected with the upper portion of the lower seat body and is formed with the outer profiling positioning surface, the two sides of the lower seat body are outwardly provided with plug-in parts, the lower seat body is installed on a workbench, the workbench is provided with inverted L-shaped guide blocks at the two sides of the lower seat body, the inverted L-shaped guide blocks and the table top of the workbench form a plug-in groove, the plug-in parts are plug-in installed in the plug-in groove, and the plug-in parts and the guide blocks are positioned and matched through positioning pins and are fixed through bolts.

[0016] The upper seat body and the lower seat body are both provided with hollows matched with the base, and the hollows are respectively an upper hollow and a lower hollow.

[0017] Further, the seat body comprises an upper seat body and a sleeve part pressing assembly, the outer centralizing sleeve, the sleeve part pressing assembly and the upper seat body are arranged from top to bottom, the inner wall of the lumen of the outer centralizing sleeve is provided with a group of circumferentially distributed elastic centralizing pieces, a plurality of sleeve part pressing assemblies are circumferentially distributed around the pipe body of the outer centralizing sleeve, the sleeve part pressing assembly comprises an inner arc-shaped pressing block and a linear driving unit, the inner arc-shaped pressing block is fixedly connected with the output end of the linear driving unit, the inner arc-shaped pressing blocks of the plurality of sleeve part pressing assemblies are mutually spliced to form a circular pressing surface under the action of the linear driving unit, the diameter of the pressing surface is smaller than the inner diameter of the lumen of the outer centralizing sleeve, and the upper seat body is formed with the outer profiling positioning surface.

[0018] Still further, the lower portion of the inner wall of the lumen of the outer centralizing sleeve is provided with an annular guide groove, the cross section of the guide groove is in the shape of a circular arc, the upper edge of the inner arc-shaped pressing block is provided with a chamfer, and the curved surface of the guide groove and the chamfered curved surface of the inner arc-shaped pressing block are smoothly connected.

[0019] Still further, the elastic centralizing piece comprises an elastic pin and a universal ball bearing installed at the pin rod end of the elastic pin, and the universal ball bearing is exposed in the lumen of the outer centralizing sleeve.

[0020] Further, the straight line driving unit comprises a pressing cylinder, a sliding block and a guide rail, an output end of the pressing cylinder is connected with an inner arc-shaped pressing block, and the inner arc-shaped pressing block is slidingly installed on the guide rail through the sliding block.

[0021] Further, the inner positioning joint is provided with an axially upward opening shaft hole and is sleeved on the lower end of the core rod through the shaft hole, long strip holes extending in the vertical direction are symmetrically formed on the two radial sides of the inner positioning joint, a limiting piece (specifically a limiting bolt) is fixedly connected with the core body after penetrating through the long strip holes, a spring is installed in the shaft hole of the inner positioning joint, and the two ends of the spring abut against the core rod and the inner positioning joint respectively.

[0022] The application provides a cylinder body and base press-fitting device of an oil cylinder, and has the following beneficial effects:

[0023] 1. The base is reliably positioned in the external contour through the outer profiled positioning surface of the seat body, and maintains a stable vertical state, and the inner positioning joint of the cylinder body righting tool is matched with the inner cavity of the base through the inner profiled positioning surface, so that double positioning is formed, and the coaxiality of the cylinder body and the base is ensured; the outer righting sleeve pipe is positioned on the outer periphery of the sleeve joint part at the bottom of the cylinder body, and further avoids the deviation of the cylinder body in the press-fitting process.

[0024] 2. The press-fitting driving unit such as an electric cylinder is used to implement the press-fitting operation, the output force is stable, and the running speed is controllable, the press-fitting cycle of a single oil cylinder is greatly shortened compared with manual press-fitting, the rotating joint is rotated by the swing cylinder, the quick avoidance of the core rod can be realized, and the feeding and discharging operation is facilitated.

[0025] 3. The electric cylinder is adjustable, has multiple gear switching strokes, and has pressure / thrust, the core rod and the core rod joint are detachably connected, the upper seat body and the lower seat body of the seat body are designed in a split type, the lower seat body is quickly locked with the workbench through the plug-in part and the positioning pin, when different specifications of the oil cylinder cylinder body and the base are replaced, only the corresponding inner positioning joint, the outer righting sleeve pipe and the upper seat body need to be replaced, the overall adjustment device does not need to be replaced, and multiple models of products can be adapted to production. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a structural schematic view of the oil cylinder and the cylinder body to be processed in the application;

[0027] Figure 2 It is a structural schematic view of the first perspective of embodiment 1 of the application;

[0028] Figure 3 It is a structural schematic view of the second perspective of embodiment 1 of the application;

[0029] Figure 4 It is a sectional view of the cooperation of the core rod, the outer righting sleeve pipe, the seat body, the cylinder body and the base in embodiment 1 of the application;

[0030] Figure 5It is a cross section schematic view of the cooperation of the outer centralizing sleeve, the seat body and the base in the embodiment 1 of the present application.

[0031] Figure 6 It is a structural schematic view of the embodiment 2 of the present application.

[0032] Figure 7 It is a cross section schematic view of the embodiment 2 of the present application.

[0033] In the figure:

[0034] P1, cylinder body;

[0035] P11, inner chamfer;

[0036] P2, base;

[0037] P21, outer chamfer;

[0038] 1, electric cylinder;

[0039] 2, electric cylinder mounting seat;

[0040] 3, lifting plate;

[0041] 4, pressure sensor;

[0042] 5, transmission joint;

[0043] 6, support vertical plate;

[0044] 7, swing cylinder;

[0045] 8, support;

[0046] 9, rotating joint;

[0047] 10, swing arm;

[0048] 11, core rod joint;

[0049] 12, core rod;

[0050] 12a, centralizing convex ring;

[0051] 13, inner positioning joint;

[0052] 13a, long hole;

[0053] 14, outer centralizing sleeve;

[0054] 14a, guide groove;

[0055] 15, upper seat body;

[0056] 15a, hollow;

[0057] 15b, outer profiled positioning surface;

[0058] 16, lower seat body;

[0059] 17. A guide block;

[0060] 18. A worktable;

[0061] 19. A limiting member;

[0062] 20. A spring;

[0063] 21. An inner arc-shaped pressing block;

[0064] 22. A pressing cylinder;

[0065] 23. A guide rail;

[0066] 24. A sliding block;

[0067] 25. An elastic pin;

[0068] 26. A universal ball. DETAILED DESCRIPTION

[0069] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0070] Referring to the drawings Figures 1-5 A cylinder body and base press-fitting device of an oil cylinder, comprising, from top to bottom, a press-fitting driving unit, a cylinder body righting tool and a base positioning tool;

[0071] The output end of the press-fitting driving unit is connected to the cylinder body righting tool and is used to drive the cylinder body righting tool to move vertically;

[0072] The cylinder body righting tool comprises a core rod 12, the upper part of the core rod 12 is provided with a righting protruding ring 12a which is integrally formed and protrudes outward, the lower end of the core rod 12 is elastically connected to an inner positioning joint 13 which is coaxially arranged, preferably, the side wall of the righting sleeve is provided with an outer chamfer along the lower edge, the gap between the righting protruding ring 12a and the cylinder body P1 is one wire, the inner positioning joint 13 can move vertically relative to the core rod 12, and the inner positioning joint 13 is provided with an inner profiled positioning surface which cooperates with the inner cavity of the base;

[0073] The base positioning tool comprises an outer righting sleeve 14 and a seat body which are fixed from top to bottom, the outer righting sleeve 14 is used to position the outer periphery of the sleeving part at the bottom of the cylinder body, and the seat body is provided with an outer profiled positioning surface 15b which cooperates with the lower part of the base.

[0074] The device uses the following process:

[0075] 1. Feeding, first, the base is placed on the seat body through the outer centering sleeve, and is positioned by the outer profiling positioning surface of the seat body, then the cylinder body is inserted into the outer centering sleeve, the sleeve joint part at the bottom of the cylinder body abuts against the cylinder body, and the outer side of the sleeve joint part is centered by the outer centering sleeve;

[0076] 2. Press fitting, the electric cylinder drives the core rod to move downward, the core rod is inserted into the cylinder body, in the process of the core rod moving downward, first, the inner positioning connector elastically connected to the lower end of the core rod first contacts the base, can cooperate with the seat body before the two are pressed together, that is, through the inner profiling positioning surface and the outer profiling positioning surface, effectively position and fix the base, guarantee the stability of the press fitting, and further improve the sealing performance of the oil cylinder, then, the core rod is sleeved outside the centering protruding ring, and the press fitting reference surface at the lower end of the core rod connector (that is, the lower end surface of the core rod connector) is in close contact with the upper end surface of the core rod, finally, under the joint action of the electric cylinder, the core rod connector and the core rod, the sleeve joint part of the cylinder body is pressed into and combined to the outside of the base;

[0077] 3. Discharging, the electric cylinder drives the core rod to move upward, when the core rod is separated from the cylinder body, the swing cylinder drives the rotating connector to rotate inward, which can realize the quick avoidance of the core rod to the cylinder body and base assembly assembled below, facilitate the discharging operation, and reduce the height requirement of the equipment and the stroke requirement of the electric cylinder.

[0078] In this embodiment, the press fitting driving unit is an electric cylinder 1, the cylinder body of the electric cylinder 1 is fixed on the electric cylinder mounting seat 2, the piston rod thereof extends downward and is connected with the cylinder body centering tool, and the four corners of the mounting seat are supported on the workbench 18 through the vertical columns.

[0079] In this embodiment, the cylinder body centering tool includes a support 8, a rotating connector 9, a core rod connector 11, a supporting vertical plate 6, a swing arm 10 and a swing cylinder 7.

[0080] The support 8 is installed on the output end of the press fitting driving unit, the rotating connector 9 is rotatably supported on the support 8 through a rotating shaft, the bottom of the rotating connector 9 is fixedly connected with the core rod connector 11, and the core rod connector 11 is detachably connected with the core rod 12.

[0081] The supporting vertical plate 6 is installed on the side of the support 8, the cylinder body of the swing cylinder 7 is rotatably connected with the supporting vertical plate 6, the lower end of the piston rod thereof is rotatably connected with the swing arm 10, and the swing arm 10 is fixedly connected with the side of the rotating connector 9.

[0082] The output end of the pressing driving unit, i.e. the piston rod of the electric cylinder 1, is connected with a pressure sensor 4, a transmission joint 5 and a lifting plate 3 in sequence, the support 8 is fixed below the lifting plate 3, and the support vertical plate 6 is fixed on the side of the lifting plate 3. The electric cylinder is connected with the pressure sensor, so that the pressing force can be monitored and adjusted in real time, the uneven pressing problem in manual pressing is avoided, and the parts are prevented from being damaged by overpressure or the assembly is prevented from being loose due to underpressure.

[0083] In the embodiment, the seat body includes an upper seat body 15 and a lower seat body 16, the upper seat body 15 is fixedly connected to the upper part of the lower seat body 16 and is formed with the outer profiling positioning surface 15b, the lower seat body 16 is outwardly protruded with a plug-in part on both sides, the lower seat body 16 is installed on a workbench 18, the workbench 18 is provided with inverted L-shaped guide blocks 17 on both sides of the lower seat body 16, the inverted L-shaped guide blocks 17 and the table top of the workbench 18 form a slot, the plug-in part is inserted into the slot, and the plug-in part and the guide blocks 17 are positioned and matched through positioning pins and are fixed through bolts.

[0084] In the embodiment, the upper seat body 15 and the lower seat body 16 are both provided with hollow parts 15a matched with the base, i.e. an upper hollow part 15a and a lower hollow part 15a.

[0085] In the embodiment, the inner positioning joint 13 is provided with an axial hole with an upward opening and is sleeved with the lower end of the core rod 12 through the axial hole, the inner positioning joint 13 is symmetrically provided with vertical long holes 13a on the two radial sides, a limiting part 19 (specifically a limiting bolt) is sleeved with the core body after passing through the long holes 13a, a spring 20 is installed in the axial hole of the inner positioning joint 13, and the two ends of the spring 20 abut against the core rod 12 and the inner positioning joint 13, respectively.

[0086] Embodiment 2

[0087] The difference between Embodiment 2 and Embodiment 1 mainly lies in the different seat body structures.

[0088] Refer to the accompanying drawings Figure 1 、 67. The base includes an upper base 15 and a socket pressing assembly. The outer straightening sleeve 14, the socket pressing assembly, and the upper base 15 are arranged from top to bottom. The upper mounting part of the outer straightening sleeve 14, which is turned outward at the bottom, can be supported by a column on the lower mounting part of the upper base 15, which is turned outward at the bottom. The upper base can be directly supported on the workbench 18. A set of circumferentially distributed elastic straightening members are provided on the upper part of the inner wall of the outer straightening sleeve 14. Several socket pressing assemblies surround the outer straightening sleeve. The tube body of the positive sleeve is circumferentially distributed. The sleeve pressing assembly includes an inner arc-shaped pressing block 21 and a linear drive unit. The inner arc-shaped pressing block 21 is fixed to the output end of the linear drive unit. Under the action of the linear drive unit, the inner arc-shaped surfaces of several inner arc-shaped pressing blocks 21 of the sleeve pressing assembly are spliced ​​together to form a circular pressing surface. The diameter of the pressing surface is smaller than the inner diameter of the outer straightening sleeve 14. The outer contour positioning surface 15b is formed on the upper seat 15.

[0089] In some embodiments, the lower part of the inner wall of the outer straightening sleeve 14 is provided with an annular guide groove 14a, the cross-section of the guide groove 14a is arc-shaped, the upper edge of the inner arc-shaped pressure block 21 is chamfered, and the curved surface of the guide groove 14a and the chamfered curved surface of the inner arc-shaped pressure block 21 are smoothly connected.

[0090] In this embodiment, the elastic straightening element includes an elastic pin 25 and a universal ball bearing 26 mounted on the end of the pin 25. The universal ball bearing 26 is exposed in the cavity of the outer straightening sleeve 14. The elastic straightening element inside the outer straightening sleeve, i.e., the combination of the elastic pin and the universal ball bearing, can adapt to minor dimensional deviations on the outer periphery of the cylinder body and effectively straighten the cylinder body.

[0091] In this embodiment, the linear drive unit includes a clamping cylinder 22, a slider 24, and a guide rail 23. The output end of the clamping cylinder 22 is connected to an inner arc-shaped pressure block 21, and the inner arc-shaped pressure block 21 is slidably mounted on the guide rail 23 via the slider 24.

[0092] The inner edge of the bottom of the sleeve portion at the bottom of the cylinder body has an inner chamfer, and the outer edge of the upper part of the seat body has an outer chamfer. The outer and inner chamfers cooperate to guide the pressing of the sleeve portion of the cylinder body during the downward pressing process. After the outer chamfer, the sleeve portion will expand outward to a certain extent. If the cylinder body is thin or the local area is thin, the elastic clamping force of the sleeve portion itself may not be sufficient to completely fit the mating surfaces. The actual interference fit in the local area of ​​the mating surface will be significantly reduced or even completely disappeared, resulting in sealing failure. In embodiment 2, a set of elastic straightening members are set on the outer periphery of the mating area of ​​the sleeve portion and the base. The circular pressing surface formed by the splicing of a set of inner arc-shaped pressure blocks 21 and the side of the inner positioning joint 13 are used to achieve radial pressing, ensuring the sealing effect of both.

[0093] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0094] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cylinder body and base pressing device for a hydraulic cylinder, characterized in that: It includes, from top to bottom, a press-fitting drive unit, a cylinder body straightening fixture, and a base positioning fixture; The output end of the press-fitting drive unit is connected to the cylinder body straightening fixture and is used to drive the cylinder body straightening fixture to move vertically. The cylinder straightening fixture includes a core rod, the upper part of which is provided with an outwardly protruding straightening ring, and the lower end of which is elastically connected to a coaxially arranged inner positioning joint. The inner positioning joint can move vertically relative to the core rod, and the inner positioning joint is provided with an inner contour positioning surface that mates with the inner cavity of the base. The base positioning fixture includes an outer straightening sleeve and a base body fixedly connected from top to bottom. The outer straightening sleeve is used to position the outer periphery of the sleeve part at the bottom of the cylinder body, and the base body is provided with an outer contour positioning surface that matches the lower contour of the base.

2. The cylinder body and base pressing device for a hydraulic cylinder as described in claim 1, characterized in that: The press-fitting drive unit is an electric cylinder. The cylinder body of the electric cylinder is fixed on the electric cylinder mounting base, and its piston rod extends downward and is connected to the cylinder body straightening fixture.

3. The cylinder body and base pressing device for a hydraulic cylinder as described in claim 2, characterized in that: The cylinder straightening fixture includes a support, a rotary joint, a core rod joint, a support vertical plate, a swing arm, and a swing cylinder; The support is installed at the output end of the press-fitting drive unit, the rotary joint is rotatably supported on the support via a rotating shaft, and a core rod joint is fixedly connected to the bottom of the rotary joint. The core rod joint is detachably connected to the core rod. The supporting vertical plate is installed on the side of the support. The bottom of the cylinder body of the swing cylinder is rotatably connected to the supporting vertical plate, and the lower end of its piston rod is rotatably connected to the swing arm. The swing arm is fixed to the side of the rotating joint.

4. The cylinder body and base pressing device for a hydraulic cylinder as described in claim 3, characterized in that: The base includes an upper base and a lower base. The upper base is fixed to the upper part of the lower base and forms the outer contour positioning surface. The lower base has plug-in portions protruding outward on both sides. The lower base is mounted on a workbench. The workbench has inverted L-shaped guide blocks on both sides of the lower base. The inverted L-shaped guide blocks and the workbench surface form slots. The plug-in portions are inserted into the slots. The plug-in portions and guide blocks are positioned and engaged by positioning pins and locked and fixed by bolts.

5. The cylinder body and base pressing device for a hydraulic cylinder as described in claim 3, characterized in that: The base includes an upper base and a fitting assembly. The outer straightening sleeve, the fitting assembly, and the upper base are arranged from top to bottom. The upper part of the inner wall of the outer straightening sleeve is provided with a group of circumferentially distributed elastic straightening elements. Several fitting assemblies are circumferentially distributed around the body of the outer straightening sleeve. The fitting assembly includes an inner arc-shaped pressure block and a linear drive unit. The inner arc-shaped pressure block is fixed to the output end of the linear drive unit. Under the action of the linear drive unit, the inner arc-shaped surfaces of the inner arc-shaped pressure blocks of several fitting assemblies are joined together to form a circular pressing surface. The diameter of the pressing surface is smaller than the inner diameter of the outer straightening sleeve. The upper base has the outer contour positioning surface.

6. The cylinder body and base pressing device for a hydraulic cylinder as described in claim 5, characterized in that: The lower part of the inner wall of the outer straightening sleeve is provided with an annular guide groove. The cross-section of the guide groove is arc-shaped. The upper edge of the inner arc-shaped pressure block is chamfered. The curved surface of the guide groove and the chamfered curved surface of the inner arc-shaped pressure block are smoothly connected.

7. The cylinder body and base pressing device for a hydraulic cylinder as described in claim 5, characterized in that: The elastic straightening element includes an elastic pin and a universal ball bearing installed at the end of the elastic pin rod, the universal ball bearing being exposed in the cavity of the outer straightening sleeve.

8. The cylinder body and base pressing device for a hydraulic cylinder as described in claim 5, characterized in that: The linear drive unit includes a clamping cylinder, a slider, and a guide rail. The output end of the clamping cylinder is connected to an inner arc-shaped pressure block, which is slidably mounted on the guide rail via the slider.

9. The cylinder body and base pressing device for a hydraulic cylinder as described in claim 1, characterized in that: The inner positioning joint has an upward-facing shaft hole and is fitted onto the lower end of the core rod through the shaft hole. The inner positioning joint has symmetrically opened elongated holes extending vertically on both radial sides. The limiting member passes through the elongated holes and is fixed to the core body. A spring is installed in the shaft hole of the inner positioning joint, and the two ends of the spring abut against the core rod and the inner positioning joint, respectively.

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