A jack piston rod assembly device

Abstract

The application discloses a jack piston rod assembling device and relates to the technical field of jack piston rod assembling. The device comprises a base and an assembling part for assembling a piston rod body and a jack cylinder body. The assembling part comprises a T-shaped rod fixed to the top outer wall of the base, a V-shaped slide way movably connected to the outer wall of the T-shaped rod, and a limiting slide hole formed in the surface of the V-shaped slide way. A clamping plate is welded to the outer wall of one side of the V-shaped slide way. A spring is sleeved to the outer wall of the T-shaped rod. The multiple sector plates are arranged in an active unfolding mode. When the multiple sector plates are not unfolded, the piston rod body can be supported and placed. When the piston rod body is lowered and inserted into the jack cylinder body for assembling, the sector plates are gradually unfolded outward during the lowering process by the limiting slide hole and the guide rod. Finally, the piston rod body is inserted into the jack cylinder body for assembling through the gap between the multiple sector plates.

Description

Technical Field

[0001] This invention relates to the field of jack piston rod assembly technology, and more particularly to a jack piston rod assembly device. Background Technology

[0002] In existing technology, jacks are one of the common hydraulic components in mechanical equipment. A jack specifically includes a cylinder and a piston rod. When assembling a jack, the piston rod needs to be inserted into the cylinder, and finally the piston rod and the cylinder are fixed together by accessories such as guide sleeves. Existing assembly devices for piston rods and cylinders require clamping and fixing the piston rod and cylinder separately using clamps. After clamping and fixing, they need to be centered. Finally, the clamped piston rod is moved and inserted into the cylinder for assembly. This method requires frequent clamping of the piston rod and cylinder, so it is inefficient in terms of assembly efficiency.

[0003] A search revealed a Chinese patent application with patent number 202221911951.0, which discloses a jack assembly device, including a limiting seat and a top-pressing cylinder. The limiting seat has an internal cavity for holding the outer cylinder of the jack to be assembled, and the side wall of the limiting seat is provided with a tightening bolt. The top-pressing cylinder is vertically positioned above the limiting seat.

[0004] The jack assembly device in the aforementioned patent has the following drawbacks: during assembly, the outer cylinder needs to be fixed using tightening bolts and a limiting plate, requiring frequent tightening and loosening of the tightening bolts before and after assembly, resulting in a prolonged operation and reduced assembly efficiency. Therefore, this invention designs a jack piston rod assembly device to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a jack piston rod assembly device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a jack piston rod assembly device, comprising a base and an assembly part for assembling the piston rod body and the jack cylinder body, wherein the assembly part includes:

[0007] The T-shaped rod is fixed to the top outer wall of the base, and the outer wall of the T-shaped rod is movably connected to a V-shaped slide, and the surface of the V-shaped slide is provided with a limit sliding hole;

[0008] The positioning plate is welded to the outer wall of one side of the V-shaped slide rail;

[0009] Spring 1 is sleeved on the outer wall of the T-shaped rod, and its two ends are respectively snapped into the inner wall of the top of the T-shaped rod and the outer wall of the top of the V-shaped slide.

[0010] The movable ring has a lateral slide rail welded to its top outer wall, and a limit rod is fixed between the inner walls on both sides of the lateral slide rail by a pin.

[0011] The slider is slidably connected to the inner wall of the side slide, and a guide rod is welded to one end of the slider. A limit piece is fixed to the outer circumference of the guide rod by a pin.

[0012] An extension plate is fixed to one end of the guide rod by a pin, and a fan-shaped plate is welded to one end of the extension plate.

[0013] Side plates: Two side plates are fixed to the top of the fan-shaped plate with screws, and rollers are movably connected between the two side plates.

[0014] A rectangular plate is welded to the top of the side slide rail, and a horizontal plate is slidably connected to the outer wall of the rectangular plate, and the horizontal plate and the top of the V-shaped slide rail are fixedly connected.

[0015] Spring 2 is sleeved on the outer wall of the rectangular plate, and both ends of spring 2 are fixed to the top outer wall of the side slide and the bottom outer wall of the horizontal plate by snap-fitting.

[0016] Multiple sector plates are designed to be movable and unfoldable. Before the sector plates are unfolded, they facilitate the support and feeding of the piston rod body. When the piston rod body moves down and is inserted into the jack cylinder for assembly, the sector plates gradually unfold outward during the downward movement using the limiting sliding holes and guide rods. Finally, the piston rod body passes through the gaps between the multiple sector plates and is inserted into the jack cylinder for assembly.

[0017] In a further embodiment, a bracket is fixed on the base, a hydraulic cylinder is mounted on the bracket, a mounting plate is fixed to the output end of the hydraulic cylinder by screws, and a vacuum suction cup is fixed to the bottom of the mounting plate by screws.

[0018] In a further embodiment, a rotating column is movably connected to the inner wall of the through hole on the surface of the rectangular plate, and a torsion spring is fixed between the outer circumference of the rotating column and the outer wall of the rectangular plate by a snap-fit ​​method.

[0019] In a further embodiment, an L-shaped plate is screwed to one end of the rotating column, and an elastic plate is embedded in one side of the L-shaped plate. A positioning plate is welded to the end of the elastic plate away from the L-shaped plate, and a roller is movably connected to one end of the positioning plate.

[0020] In a further embodiment, a lower pressure plate is welded to one side of the outer wall of the positioning plate, and a conical disc that works in conjunction with the lower pressure plate is fixed to the outer wall of the mounting plate by screws.

[0021] In a further embodiment, a disc is welded to the top outer wall of the base, and a mounting shell is threaded to the top outer wall of the disc, with a universal ball movably connected inside the mounting shell.

[0022] In a further embodiment, the outer wall of the V-shaped slide is fixed with a connecting column by screws, and a frame is welded to the end of the connecting column away from the V-shaped slide.

[0023] Based on the aforementioned solution: a conical inner expansion seat is embedded at the bottom of the frame, and a wiping cloth is adhered to the inner wall of the bottom opening of the conical inner expansion seat.

[0024] In a further embodiment, the limiting sliding hole is a two-section type, with the upper section perpendicular to the horizontal plane and the lower section at a certain angle to the horizontal plane.

[0025] In a further embodiment, the outer diameter of the guide rod and the inner diameter of the limiting sliding hole are mutually adapted.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] 1. By setting multiple sector plates to be movable and unfoldable, it is convenient to support and feed the piston rod body before the multiple sector plates are unfolded. When the piston rod body moves down and is inserted into the jack cylinder for assembly, the limiting sliding hole and guide rod are used to make the sector plates gradually unfold outward during the downward movement, so that the piston rod body finally passes through the gap between the multiple sector plates and is inserted into the jack cylinder for assembly, making the assembly more convenient.

[0028] 2. By setting three sets of locking plates, the jack cylinder is centered during the downward movement. The universal ball is used to make fine adjustments to the bottom position of the jack cylinder during the centering process, thus protecting the jack cylinder.

[0029] 3. By setting the conical disc to a conical shape so that it simultaneously squeezes multiple lower pressure plates after moving downwards, the piston rod body is centered during the synchronous inward contraction of multiple rollers, thereby ensuring that the axis between the piston rod body and the jack cylinder coincides and ensuring the accuracy of the two during assembly.

[0030] 4. By incorporating a vacuum suction cup, the piston rod body is adsorbed and fixed after centering. Compared to the traditional method of using grippers to clamp and fix the piston rod body, this avoids dents and damage to the surface of the piston rod body after clamping.

[0031] 5. By setting the inner diameter of the concave opening at the bottom of the conical inner expansion seat to be slightly smaller than the outer diameter of the piston rod body, the piston rod body expands the concave opening during its downward movement. This ensures that the wiping cloth and the outer circumference of the piston rod body fit tightly together, allowing the piston rod body to slide along the wiping cloth while the wiping cloth wipes the outer circumference of the piston rod body. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the overall structure of a jack piston rod assembly device proposed in this invention;

[0034] Figure 2 This is a side view structural diagram of a jack piston rod assembly device proposed in this invention;

[0035] Figure 3 This is a schematic diagram of the main structure of a jack piston rod assembly device proposed in this invention;

[0036] Figure 4 This is a schematic diagram of the jack cylinder placement assembly structure of a jack piston rod assembly device proposed in this invention;

[0037] Figure 5 This is a partial structural diagram of the assembly part of a jack piston rod assembly device proposed in this invention;

[0038] Figure 6 This is a schematic diagram of the bottom positioning of the jack in a jack piston rod assembly device proposed in this invention;

[0039] Figure 7 This is a schematic diagram of the piston rod positioning structure of a jack piston rod assembly device proposed in this invention;

[0040] Figure 8 This is a schematic diagram of the pressing component structure of a jack piston rod assembly device proposed in this invention;

[0041] Figure 9 This is a schematic diagram of the cleaning component structure of a jack piston rod assembly device proposed in this invention.

[0042] The attached diagram lists the components represented by each number as follows:

[0043] 1-Base, 2-Bracket, 3-Hydraulic cylinder, 4-Conical disc, 5-Horizontal plate, 6-V-shaped slide rail, 7-T-shaped rod, 8-Spring 1, 9-Moving ring, 10-Piston rod body, 11-Side slide rail, 12-Limit rod, 13-Disc base, 14-Mounting shell, 15-Universal ball joint, 16-Rectangular plate, 17-Connecting column, 18-Frame, 19-Limiting piece, 20-Spring 2, 21-Guide rod 22-Extension plate, 23-Side plate, 24-Roller, 25-Fan-shaped plate, 26-Slider, 27-Positioning plate, 28-Elastic plate, 29-Rotating column, 30-Torsion spring, 31-Mounting plate, 32-L-shaped plate, 33-Roller, 34-Pressing plate, 35-Vacuum suction cup, 36-Conical inner expansion seat, 37-Wiping cloth, 38-Limiting sliding hole, 39-Positioning plate, 40-Jack cylinder body. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] This invention provides a technical solution:

[0046] A jack piston rod assembly device, in one embodiment, such as Figures 1 to 9 As shown, the assembly includes a base 1 and an assembly part for assembling the piston rod body 10 and the jack cylinder body 40. The assembly part includes:

[0047] T-shaped rod 7: It is fixed to the top outer wall of the base 1 by bolts, and the outer wall of the T-shaped rod 7 is slidably connected to a V-shaped slide rail 6, and the surface of the V-shaped slide rail 6 is provided with a limit sliding hole 38.

[0048] Positioning plate 39: It is welded to the outer wall of one side of the V-shaped slide 6;

[0049] Spring 8: It is sleeved on the outer wall of T-shaped rod 7, and the two ends of spring 8 are respectively snapped into the top inner wall of T-shaped rod 7 and the top outer wall of V-shaped slide 6;

[0050] The movable ring 9 has a side slide 11 welded to its top outer wall, and a limit rod 12 is fixed between the inner walls on both sides of the side slide 11 by a pin.

[0051] Slider 26: It is slidably connected to the inner wall of the side slide 11, and a guide rod 21 is welded to one end of the slider 26. The outer circumference of the guide rod 21 is fixed with a limiting piece 19 by a pin, and the outer diameter of the guide rod 21 and the inner diameter of the limiting slide hole 38 are mutually compatible.

[0052] Extension plate 22: It is fixed to one end of the guide rod 21 by a pin, and a fan-shaped plate 25 is welded to one end of the extension plate 22;

[0053] Side plate 23: Two side plates 23 are fixed to the top of the fan-shaped plate 25 by screws, and rollers 24 are rotatably connected between the two side plates 23;

[0054] Rectangular plate 16: It is welded to the top of the side slide 11, and a horizontal plate 5 is slidably connected to the outer wall of the rectangular plate 16, and the horizontal plate 5 and the top of the V-shaped slide 6 are fixedly connected.

[0055] Spring 20: It is sleeved on the outer wall of the rectangular plate 16, and the two ends of the spring 20 are respectively fixed to the top outer wall of the side slide 11 and the bottom outer wall of the horizontal plate 5 by snap-fit.

[0056] In the initial stage, the jack cylinder 40 is placed on the base 1, and the piston rod body 10 is placed on multiple sector plates 25. The multiple sector plates 25 form a circular structure to support the piston rod body 10. When the piston rod body 10 needs to be inserted into the jack cylinder 40 for assembly, a vertically downward force is first applied to the top of the piston rod body 10. After being subjected to pressure, the piston rod body 10 uses the force transmission property to press against the multiple sector plates 25. The elastic coefficient of the second spring 20 is greater than that of the first spring 8. When the piston rod body 10 presses against the multiple sector plates 25... During the process, spring 8 and spring 20 deform simultaneously, but the deformation of spring 20 is less than that of spring 8. After spring 8 deforms, the V-shaped slide 6 moves downward along the T-shaped rod 7. During this process, multiple positioning plates 39 position the top of the jack cylinder 40 while moving downward synchronously. In this embodiment, the number of positioning plates 39 is preferably three sets, and the gap angle between the three sets of positioning plates 39 is 120 degrees. During the downward movement of the three positioning plates 39, they play the function of correcting deviation and centering the jack cylinder 40, so that the axis of the jack cylinder 40 and the axis of the circular structure coincide with each other.

[0057] When the locking plate 39 and the top of the jack cylinder 40 are in contact, the jack cylinder 40 restricts the locking plate 39 in the opposite direction. This causes the second spring 20 to continue to deform elastically as the piston rod body 10 continues to press the sector plate 25. During this process, the rectangular plate 16 moves downward along the horizontal plate 5, using the limiting sliding hole 38 to guide the movement path of the guide rod 21. The limiting sliding hole 38 is a two-section type, with the upper section perpendicular to the horizontal plane and the lower section at a certain angle to the horizontal plane. When the first spring 8 deforms, the second spring 20... During the deformation process, the guide rod 21 moves along the upper section, while the multiple sector plates 25 remain relatively stationary. When the guide rod 21 moves to the lower section, the lower section is used to make the guide rod 21 move laterally during its downward movement, causing the multiple sector plates 25 to unfold outwards simultaneously. During this process, the piston rod body 10 slides along the outer circumference of the roller 24. As the multiple sector plates 25 continue to unfold, the piston rod body 10 eventually passes through the gap formed between the multiple sector plates 25 and is inserted into the jack cylinder 40 for assembly.

[0058] Furthermore, a bracket 2 is fixed to the top outer wall of the base 1 by bolts, a hydraulic cylinder 3 is fixed to the top outer wall of the bracket 2 by bolts, a mounting plate 31 is fixed to the output end of the hydraulic cylinder 3 by screws, and a vacuum suction cup 35 is fixed to the bottom of the mounting plate 31 by screws.

[0059] During assembly, the hydraulic cylinder 3 drives the vacuum suction cup 35 to move downward, and the vacuum suction cup 35 applies vertical pressure to the top of the piston rod body 10. At the same time, the vacuum suction cup 35 adsorbs and fixes the top of the piston rod body 10, thereby ensuring the stability of the piston rod body 10 when it falls from the gap formed between the multiple sector plates 25.

[0060] Furthermore, a rotating column 29 is rotatably connected to the inner wall of the through hole on the surface of the rectangular plate 16, and a torsion spring 30 is fixed between the outer circumference of the rotating column 29 and the outer wall of the rectangular plate 16 by a snap-fit. An L-shaped plate 32 is screwed to one end of the rotating column 29, and an elastic plate 28 is embedded in one side of the L-shaped plate 32. A positioning plate 27 is welded to the end of the elastic plate 28 away from the L-shaped plate 32, and a roller 33 is rotatably connected to one end of the positioning plate 27.

[0061] A lower pressure plate 34 is welded to one side of the outer wall of the positioning plate 27, and a conical disc 4 that works with the lower pressure plate 34 is fixed to the outer wall of the mounting plate 31 by screws.

[0062] After the piston rod body 10 is discharged, in order to ensure that the axis of the piston rod body 10 and the axis of the jack cylinder 40 coincide, so that the piston rod body 10 can be accurately inserted into the jack cylinder 40 for assembly after moving down, a conical disc 4 is provided to press the end of the lower pressure plate 34 as it moves down synchronously with the mounting plate 31. After being pressed by the conical disc 4, the multiple lower pressure plates 34 slide along the inner wall of the conical disc 4, causing multiple rollers 33 to retract towards the outer circumference of the piston rod body 10 at the same time. When the rollers 33 move to fit against the outer circumference of the piston rod body 10, the piston rod body 10 is centered. The elastic plate 28 has a certain elasticity, so it plays a certain buffering role after the rollers 33 fit against the outer circumference of the piston rod body 10, thereby avoiding excessive pressure on the outer circumference of the piston rod body 10 caused by the rollers 33, thus providing a certain protection for the piston rod body 10.

[0063] Furthermore, a disc base 13 is welded to the top outer wall of the base 1, and a mounting shell 14 is threaded to the top outer wall of the disc base 13, and a universal ball 15 is movably connected inside the mounting shell 14.

[0064] When the jack cylinder 40 is discharging material, when the jack cylinder 40 is placed on the outer wall of the spherical surface of the multiple universal balls 15, the jack cylinder 40 slides along the outer wall of the spherical surface of the universal balls 15 during the centering process. Compared with placing it directly on the base 1, this reduces the friction between the bottom of the jack cylinder 40 and the base 1, and plays a protective role for the jack cylinder 40.

[0065] In this embodiment, when assembling the piston rod body 10 and the jack cylinder 40, the jack cylinder 40 is first placed on top of multiple universal balls 15, and the piston rod body 10 is placed on top of multiple rollers 24. Then, the hydraulic cylinder 3 drives the vacuum suction cup 35 to move downwards vertically. After the vacuum suction cup 35 moves downwards, it first contacts the top of the piston rod body 10. At this time, the vacuum suction cup 35 does not suction the piston rod body 10. As the conical disk 4 moves downwards synchronously with the mounting plate 31, it squeezes the end of the lower pressure plate 34. After being squeezed by the conical disk 4, the multiple lower pressure plates 34 slide along the inner wall of the conical disk 4, causing the multiple rollers 33 to simultaneously retract towards the outer circumference of the piston rod body 10. When the rollers 33 move to fit against the outer circumference of the piston rod body 10, the piston rod body 10 is centered. After the piston rod body 10 is centered, the hydraulic cylinder 33 is used to assemble the piston rod body 10. The top of the piston rod body 10 is attracted by the vacuum suction cup 35. After the vacuum suction cup 35 moves down, it applies pressure to the top of the piston rod body 10, and the spring 8 gradually deforms. During the synchronous downward movement of the three sets of positioning plates 39, the top of the jack cylinder 40 is centered. When the positioning plates 39 and the top of the jack cylinder 40 are in contact, the spring 20 continues to deform as the vacuum suction cup 35 continues to move down, causing the guide rod 21 to slide along the limiting sliding hole 38. The limiting sliding hole 38 guides the movement path of the guide rod 21, so that the guide rod 21 also moves laterally during the downward movement, thereby causing multiple fan-shaped plates 25 to unfold outward at the same time. Finally, the piston rod body 10 is inserted into the jack cylinder 40 after passing through the gap between the multiple fan-shaped plates 25. The vacuum suction cup 35 no longer attracts the top of the piston rod body 10, thus completing the assembly between the piston rod body 10 and the jack cylinder 40.

[0066] A jack piston rod assembly device, in some other embodiments, such as Figure 9 As shown, in order to clean the outer circumference of the piston rod body 10, this embodiment makes the following additions based on embodiment 1: the outer wall of the V-shaped slide 6 is fixed with a connecting post 17 by screws, and a frame 18 is welded to the end of the connecting post 17 away from the V-shaped slide 6, and a conical inner expansion seat 36 is embedded in the bottom of the frame 18, and a wiping cotton cloth 37 is adhered to the inner wall of the bottom opening of the conical inner expansion seat 36;

[0067] As the piston rod body 10 is inserted into the inner wall of the jack cylinder 40, the piston rod body 10 will pass vertically through the concave opening at the bottom of the conical inner expansion seat 36. The inner diameter of the concave opening is slightly smaller than the outer diameter of the piston rod body 10, so that the piston rod body 10 will open the concave opening during the downward movement. This ensures that the wiping cloth 37 and the outer circumference of the piston rod body 10 are in close contact. As the piston rod body 10 slides along the wiping cloth 37, the outer circumference of the piston rod body 10 is wiped by the wiping cloth 37, thereby ensuring the cleanliness of the surface of the piston rod body 10 after assembly.

[0068] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, 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 any suitable manner in one or more embodiments or examples.

[0069] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A jack piston rod assembly device, comprising a base (1) and an assembly part for assembling the piston rod body (10) and the jack cylinder body (40), characterized in that, The assembly unit includes: T-shaped rod (7) is fixed to the top outer wall of base (1), and a V-shaped slide (6) is movably connected to the outer wall of T-shaped rod (7), and a limit sliding hole (38) is opened on the surface of V-shaped slide (6). A plate base (13) is installed on the base (1), and multiple mounting shells (14) are provided on the top of the plate base (13), and a universal ball (15) is movably connected inside the mounting shell (14). The limiting sliding hole (38) is a two-section type, with the upper section perpendicular to the horizontal plane and the lower section inclined to the horizontal plane; The positioning plate (39) is welded to the outer wall of one side of the V-shaped slide (6); Spring 1 (8) is sleeved on the top of T-shaped rod (7), and the other end of spring 1 (8) is connected to the top of V-shaped slide (6); The moving ring (9) has a side slide (11) welded to its top outer wall; The slider (26) is slidably connected to the inner wall of the side slide (11), and a guide rod (21) is welded to one end of the slider (26). An extension plate (22) is fixed to one end of a guide rod (21), and a fan-shaped plate (25) is welded to one end of the extension plate (22). A rectangular plate (16) is welded to the top of the side slide (11), and a horizontal plate (5) is slidably connected to the outer wall of the rectangular plate (16), and the horizontal plate (5) is fixedly connected to the top of the V-shaped slide (6); Spring 2 (20) is sleeved on the bottom end of rectangular plate (16), and the other end of spring 2 (20) is connected to the bottom of horizontal plate (5); Multiple sector plates (25) are designed to be movable and unfoldable. Before the multiple sector plates (25) are unfolded, they facilitate the support and feeding of the piston rod body (10). When the piston rod body (10) moves down and is inserted into the jack cylinder (40) for assembly, the sector plates (25) are gradually unfolded outward during the downward movement using the limiting sliding hole (38) and the guide rod (21). Finally, the piston rod body (10) passes through the gap between the multiple sector plates (25) and is inserted into the jack cylinder (40) for assembly.

2. The jack piston rod assembly device according to claim 1, characterized in that, A bracket (2) is fixed on the base (1), a hydraulic cylinder (3) is installed on the bracket (2), an installation plate (31) is fixed at the output end of the hydraulic cylinder (3), and a vacuum suction cup (35) is installed at the bottom of the installation plate (31).

3. The jack piston rod assembly device according to claim 2, characterized in that, A rotating column (29) is movably connected to the rectangular plate (16), and a torsion spring (30) is fixed between the outer wall of the rotating column (29) and the outer wall of the rectangular plate (16) by a snap-fit ​​method.

4. The jack piston rod assembly device according to claim 3, characterized in that, One end of the rotating column (29) is fixed with an L-shaped plate (32), and an elastic plate (28) is embedded on one side of the L-shaped plate (32). A positioning plate (27) is welded to the end of the elastic plate (28) away from the L-shaped plate (32), and a roller (33) is rotatably connected to one end of the positioning plate (27).

5. The jack piston rod assembly device according to claim 4, characterized in that, The positioning plate (27) has a lower pressure plate (34) welded to one side of its outer wall, and the mounting plate (31) has a conical disc (4) fixed to its outer wall to cooperate with the lower pressure plate (34).

6. The jack piston rod assembly device according to claim 1, characterized in that, The outer wall of the V-shaped slide (6) is fixed with a connecting column (17), and a frame (18) is welded to the end of the connecting column (17) away from the V-shaped slide (6).

7. The jack piston rod assembly device according to claim 6, characterized in that, The bottom of the frame (18) is embedded with a conical inner expansion seat (36), and a wiping cloth (37) is adhered to the inner wall of the bottom opening of the conical inner expansion seat (36).

8. The jack piston rod assembly device according to claim 1, characterized in that, The outer diameter of the guide rod (21) and the inner diameter of the limiting sliding hole (38) are mutually adapted, and the limiting piece (19) is fixed on the outer circumference of the guide rod (21).

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