Puller for fluid coupling maintenance

Abstract

The present invention relates to the technical field of fluid coupling maintenance equipment. Disclosed is a puller for fluid coupling maintenance, comprising a hydraulic cylinder and a connecting sleeve. A screw rod is threadedly mounted inside the hydraulic cylinder. The connecting sleeve is sleeved on the outside of the screw rod. A threaded sleeve is provided inside the connecting sleeve. The threaded sleeve extends outwards from an end portion of the connecting sleeve away from the hydraulic cylinder, and the threaded sleeve is detachably connected to the connecting sleeve. An end portion of the screw rod proximal to the connecting sleeve is movably inserted into the threaded sleeve. An ejector rod having an adjustable length is disposed on the end portion of the screw rod inserted into the threaded sleeve. The ejector rod is arranged to extend out of the threaded sleeve. In the present invention, the connecting sleeve and the threaded sleeve are detachably connected, such that the threaded sleeve can be easily replaced when threads on the threaded sleeve are damaged. The screw rod is provided with an ejector rod having an adjustable length, so as to adapt to disassembly of different models of fluid couplings. The invention provides the advantages of reduced usage costs, ease of use, and improved disassembly efficiency.

Description

A puller for repairing a hydraulic coupling Technical Field

[0001] This invention relates to a puller for repairing hydraulic couplers, belonging to the technical field of hydraulic coupler repair equipment. Background Technology

[0002] A hydraulic coupling, also known as a hydraulic joint, is a hydraulic transmission device that uses the kinetic energy of a liquid to transfer energy. It primarily achieves the conversion between mechanical energy and liquid kinetic energy through the interaction of a pump impeller and a turbine, thereby connecting the prime mover and the working machine to achieve power transmission. A puller is a tool specifically designed for disassembling and installing hydraulic couplings. It works by inserting the threaded end of a connecting module into the disassembly hole of the hydraulic coupling. A hydraulic cylinder then pushes a push rod inside the connecting module to generate a pure axial thrust that tightens the main shaft. The connecting module then generates a reaction force that pulls the hydraulic coupling, allowing technicians to easily disassemble and assemble the coupling. It is characterized by convenient installation and simple operation, making the puller an indispensable tool for repairing hydraulic couplings.

[0003] Currently, most common pullers use integrally cast connecting modules. For example, Chinese patent application CN104227652A discloses a puller specifically for hydraulic couplers, which includes a puller base plate, an adjusting screw, and a puller head. The two ends of the adjusting screw are fixedly connected to the puller base plate and the puller head, respectively. The puller head includes a head base and a threaded column integrally connected to the head base. The central hole of the head penetrates the head base and the column. The connecting module in this special puller, namely the puller head and the puller head base, is integrally cast. After prolonged use, the threads on the connecting module of this type of specialized puller may become damaged due to stress, preventing it from being installed into the disassembly hole to connect to the hydraulic coupler. In this case, the entire connecting module must be replaced before it can be installed in the disassembly hole, resulting in a significant waste of spare parts and increasing the operating cost of the puller. Furthermore, because different models of hydraulic couplers have varying distances between the bearing seat and the shaft section, and most existing pullers have fixed-length push rods, they can only disassemble hydraulic couplers at fixed depths, making it impossible to disassemble hydraulic couplers at different depths. Users need to carry push rods of different lengths to disassemble hydraulic couplers at different depths, which is quite inconvenient. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, the present invention provides a puller for repairing hydraulic couplings.

[0005] The technical solution of the present invention is as follows:

[0006] A puller for repairing a hydraulic coupling includes a hydraulic cylinder and a connecting sleeve. A lead screw is installed internally in the hydraulic cylinder. The connecting sleeve is installed on the output end face of the hydraulic cylinder and sleeved over the lead screw. A threaded sleeve is provided inside the connecting sleeve, extending outward from the end of the connecting sleeve away from the hydraulic cylinder. The threaded sleeve is detachably connected to the connecting sleeve. The end of the lead screw close to the connecting sleeve is movably inserted into the threaded sleeve. A push rod of variable length is provided on the end of the lead screw inserted into the threaded sleeve, extending out of the threaded sleeve.

[0007] Furthermore, the connecting sleeve has an anti-rotation groove inside, and the end of the threaded sleeve close to the connecting sleeve is provided with a limiting tooth plate that is adapted to the anti-rotation groove. The limiting tooth plate is movably installed inside the anti-rotation groove.

[0008] Furthermore, the end of the connecting sleeve away from the hydraulic cylinder is provided with a through-hole, which is connected to the anti-rotation tooth groove. The threaded sleeve is provided through the through-hole, and the end face area of ​​the limiting tooth plate is larger than the opening area of ​​the through-hole.

[0009] Furthermore, a limiting cylinder is provided on the end of the connecting sleeve away from the hydraulic cylinder, which is surrounded by the opening. The threaded sleeve is arranged through the limiting cylinder. A placement groove is opened on the outer wall of the threaded sleeve. A first limiting bead is elastically installed in the placement groove by a spring. A first slot is opened on the inner wall of the limiting cylinder, which is adapted to the first limiting bead. The first limiting bead is engaged and installed inside the first slot.

[0010] Furthermore, the push rod includes a top seat, a first connecting seat and a second connecting seat arranged sequentially in the direction close to the lead screw. The top seat is threadedly installed at one end of the first connecting seat. A threaded cylinder is provided on the side wall of the second connecting seat away from the first connecting seat. The threaded cylinder is threadedly installed inside the lead screw. A threaded rod is provided on the side wall of the first connecting seat close to the second connecting seat. The threaded rod is threadedly installed inside the second connecting seat and extends through the second connecting seat to the inner cavity of the threaded cylinder.

[0011] Furthermore, a threaded post is provided on the side wall of the top seat close to the first connecting seat, and a first threaded groove is provided inside the first connecting seat, with the threaded post threadedly installed inside the first threaded groove.

[0012] Furthermore, the second connecting seat has a second threaded groove inside, the threaded rod is threadedly installed in the second threaded groove, and two first locking nuts are threadedly installed on the outer wall of the threaded rod. The two first locking nuts are sequentially pressed against the side wall of the second connecting seat away from the threaded cylinder, and the internal thread directions of the two first locking nuts are also set in opposite directions.

[0013] Furthermore, the lead screw has a third threaded groove inside, and the threaded cylinder is threadedly installed inside the lead screw by connecting to the third threaded groove. Two second locking nuts are threadedly installed on the outer wall of the threaded cylinder. The two second locking nuts are sequentially pressed against the side wall of the lead screw close to the threaded cylinder, and the internal thread directions of the two second locking nuts are also reversed.

[0014] Furthermore, a second limiting ball is elastically installed on the output end of the hydraulic cylinder, and a second slot is provided on the side wall of the connecting sleeve to be adapted to the second limiting ball, and the second limiting ball is engaged and installed inside the second slot.

[0015] Furthermore, a rotating handle is also provided on one end of the lead screw.

[0016] The present invention has the following beneficial effects:

[0017] 1. This invention provides a threaded sleeve on a connecting sleeve, detachably connecting the threaded sleeve to the connecting sleeve. When the threaded sleeve needs to be installed on the connecting sleeve, it is inserted into the anti-rotation tooth groove from the end of the connecting sleeve closest to the hydraulic cylinder. A limiting tooth plate enters the anti-rotation tooth groove, and the threaded sleeve slides along the anti-rotation tooth groove under the action of the limiting tooth plate, extending out of the connecting sleeve from the opening. At this point, the limiting tooth plate cannot pass through the opening, preventing the threaded sleeve from falling out. Then, a first limiting bead on the outer wall of the threaded sleeve engages with a first groove on the inner wall of the limiting cylinder under the action of a spring, thus securing the threaded sleeve. By restricting the position of the tube, the threaded sleeve can be installed. When the threads on the threaded sleeve are damaged, the first limiting ball is pressed inward to disengage from the first slot. At this point, relative movement can occur between the threaded sleeve and the connecting sleeve, allowing the threaded sleeve to be removed from the connecting sleeve. Compared to existing technologies, the threaded sleeve on the connecting sleeve can be replaced individually, avoiding the situation where the entire connecting module needs to be replaced before it can be installed in the disassembly hole to disassemble the hydraulic coupling due to thread damage on the connecting module. This reduces the waste of spare parts and has the advantage of lower operating costs compared to existing technologies.

[0018] 2. This invention detachably connects the connecting sleeve and the threaded sleeve, allowing the threaded sleeve to be disassembled independently. When dealing with different models of hydraulic couplings, operators can replace the threaded sleeve with a suitable threaded sleeve with a corresponding diameter thread according to the diameter of the disassembly hole on the hydraulic coupling. This makes it applicable to the disassembly of different models of hydraulic couplings, and has the advantage of strong applicability.

[0019] 3. This invention features a variable-length push rod on one end of the lead screw. The combination of the push rod and the lead screw constitutes a push rod in the prior art. Tightening the first connecting seat causes the threaded rod mounted thereon to rotate in the second threaded groove. By changing the length of the threaded rod extending out of the threaded cylinder, the distance between the first and second connecting seats can be adjusted, thus changing the overall length of the push rod. Tightening the second connecting seat causes the threaded cylinder mounted thereon to rotate in the third threaded groove. By changing the length of the threaded cylinder extending out of the lead screw, the distance between the second connecting seat and the lead screw can be adjusted, also changing the overall length of the push rod. Compared to the prior art, this invention is applicable to the disassembly of hydraulic couplings at different depths, eliminating the need to carry multiple push rods of different lengths. Compared to the prior art, it has the advantages of ease of use and improved disassembly efficiency. Attached Figure Description

[0020] Figure 1 is a schematic diagram of the structure of the present invention;

[0021] Figure 2 is a schematic diagram of the connecting sleeve in this invention;

[0022] Figure 3 is a schematic diagram of the threaded sleeve in this invention;

[0023] Figure 4 is a schematic diagram of the connection between the connecting sleeve and the threaded sleeve in this invention;

[0024] Figure 5 is a schematic diagram of the jacking pipe structure in this invention.

[0025] The reference numerals in the figure are as follows:

[0026] 1. Hydraulic cylinder; 2. Connecting sleeve; 3. Lead screw; 4. Threaded sleeve;

[0027] 5. Top rod; 501. Top seat; 502. First connecting seat; 503. Second connecting seat; 504. Threaded cylinder; 505. Threaded rod; 506. Threaded column; 507. First threaded groove; 508. Second threaded groove; 509. First locking nut; 510. Third threaded groove; 511. Second locking nut;

[0028] 6. Anti-rotation tooth groove; 7. Limiting tooth plate; 8. Through port; 9. Limiting cylinder; 10. Placement groove; 11. Spring; 12. First limiting bead; 13. First slot; 14. Second limiting bead; 15. Second slot; 16. Rotating handle. Detailed Implementation

[0029] In the description of this invention, it should be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Additionally, the term "comprising" and any variations thereof are intended to cover non-exclusive inclusion.

[0030] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0031] Example: Referring to Figures 1-5, this example provides a puller for repairing a hydraulic coupling, including a hydraulic cylinder 1 and a connecting sleeve 2. A lead screw 3 is threaded onto the internal thread of the hydraulic cylinder 1. The connecting sleeve 2 is installed on the output end face of the hydraulic cylinder 1 and sleeved over the lead screw 3. A threaded sleeve 4 is movably disposed inside the connecting sleeve 2. One side of the threaded sleeve 4 extends outward from the end of the connecting sleeve 2 away from the hydraulic cylinder 1. The extended end of the threaded sleeve 4 is used for subsequent threaded installation inside the disassembly hole of the hydraulic coupling. The end of the lead screw 3 close to the connecting sleeve 2 is movably inserted into the threaded sleeve 4. A variable-length push rod 5 is disposed on the end of the lead screw 3 that penetrates the threaded sleeve 4, extending out of the threaded sleeve 4.

[0032] To facilitate replacement when the threads of the threaded sleeve 4 are damaged, in this embodiment, the threaded sleeve 4 and the connecting sleeve 2 are detachably connected. Specifically, the connecting sleeve 2 has an anti-rotation groove 6 inside, and the end of the threaded sleeve 4 close to the connecting sleeve 2 is provided with a limiting tooth plate 7 that is adapted to the anti-rotation groove 6. The limiting tooth plate 7 is movably installed inside the anti-rotation groove 6, and the threaded sleeve 4 can slide along the anti-rotation groove 6 under the action of the limiting tooth plate 7 to facilitate installation and disassembly. A through-hole 8 is provided on the end of the connecting sleeve 2 away from the hydraulic cylinder 1. The through-hole 8 is connected to the anti-rotation tooth groove 6. The threaded sleeve 4 is provided through the through-hole 8. The end face area of ​​the limiting tooth plate 7 is larger than the opening area of ​​the through-hole 8 so that the limiting tooth plate 7 cannot pass through the through-hole 8, thereby preventing the threaded sleeve 4 from falling out of the end of the connecting sleeve 2 away from the hydraulic cylinder 1. A limiting cylinder 9 is provided on the end of the connecting sleeve 2 away from the hydraulic cylinder 1, which is surrounded by the through-hole 8. The threaded sleeve 4 is provided through the limiting cylinder 9. The specific length of the threaded sleeve 4 extending out of the limiting cylinder 9 can be determined according to the actual situation, so as to meet the requirement that it can be threadedly installed inside the disassembly hole of the hydraulic coupling. The outer wall of the threaded sleeve 4 has symmetrically arranged placement grooves 10. Each placement groove 10 has a first limiting bead 12 elastically installed in it via a spring 11. The inner wall of the limiting cylinder 9 has a first locking groove 13 that is adapted to the first limiting bead 12. The first limiting beads 12 on both sides are engaged and installed inside the corresponding first locking groove 13. When the first limiting beads 12 on both sides are engaged and installed inside the corresponding first locking groove 13, the threaded sleeve 4 can be fixed to the limiting cylinder 9, that is, it can be fixed in position to the connecting sleeve, so as to realize the detachable connection between the threaded sleeve 4 and the connecting sleeve 2.

[0033] With the aforementioned setup, when installing the threaded sleeve 4, the threaded sleeve 4 is inserted inward from the end of the connecting sleeve 2 closest to the hydraulic cylinder 1, allowing the limiting tooth plate 7 on the threaded sleeve 4 to slide in the anti-rotation tooth groove 6. Then, one end of the threaded sleeve 4 extends from the through port 8 into the limiting cylinder 9 and through the limiting cylinder 9 to its outside. The limiting tooth plate 7, in conjunction with the through port 8, limits the position of the threaded sleeve 4, preventing the threaded sleeve 4 from detaching from the connecting sleeve 2. At the same time, the first limiting beads 12 on both sides of the outer wall of the threaded sleeve 4 are engaged in the corresponding first grooves 13 on the inner wall of the limiting cylinder 9 under the action of the spring 11, limiting the position of the threaded sleeve 4 and preventing the threaded sleeve 4 from moving in the opposite direction into the interior of the connecting sleeve 2. This completes the installation of the threaded sleeve 4. Afterward, the threaded sleeve 4 is used to connect the connecting sleeve 2 and the hydraulic coupling, ensuring the normal use of the connecting sleeve 2.

[0034] Because the connecting sleeve 2 has an anti-rotation groove 6 inside, and the threaded sleeve 4 is provided with a limiting tooth plate 7, which is slidably installed inside the anti-rotation groove 6, when the threaded sleeve 4 is installed into the hydraulic coupling disassembly hole, the cooperation between the limiting tooth plate 7 and the anti-rotation groove 6 can limit the position of the threaded sleeve 4, preventing the threaded sleeve 4 from rotating in the connecting sleeve 2. This avoids the situation where the threaded sleeve 4 cannot be installed into the hydraulic coupling disassembly hole due to rotation in the connecting sleeve 2, and can ensure the normal use of the threaded sleeve 4.

[0035] When the threads on the threaded sleeve 4 are damaged by stress and need to be replaced, the first limiting beads 12 in the first slots 13 on both sides are pressed to retract the first limiting beads 12 into the corresponding placement slots 10 to disengage from the limiting cylinder 9. Then, the threaded sleeve 4 is pushed so that it slides out of the connecting sleeve 2 under its own weight, thus completing the disassembly of the threaded sleeve 4. Compared with the existing technology, the threaded sleeve 4 on the connecting sleeve 2 can be replaced separately, avoiding the situation where the entire connecting module needs to be replaced before it can be installed in the disassembly hole to disassemble the hydraulic coupling due to the threads on the connecting module being damaged by stress. This reduces the waste of spare parts and lowers the operating cost of the puller.

[0036] When disassembling different models of hydraulic couplings, the detachable connection between the threaded sleeve 4 and the connecting sleeve 2 allows the operator to replace the threaded sleeve 4 with a thread of the corresponding diameter according to the diameter of the disassembly hole on the hydraulic coupling. The threaded sleeve 4 with the corresponding diameter thread is fixed on the connecting sleeve 2 and installed into the disassembly hole of the hydraulic coupling, which can adapt to the disassembly of different models of hydraulic couplings and has strong applicability.

[0037] In this embodiment, the push rod 5 includes a top seat 501, a first connecting seat 502, and a second connecting seat 503 arranged sequentially in the direction close to the lead screw 3. A threaded post 506 is provided on the side wall of the top seat 501 close to the first connecting seat 502. A first threaded groove 507 is formed inside the first connecting seat 502, and the threaded post 506 is threaded into the first threaded groove 507. The top seat 501 can be threaded onto one end of the first connecting seat 502 through the connection between the threaded post 506 and the first threaded groove 507. A threaded rod 505 is provided on the side wall of the first connecting seat 502 close to the second connecting seat 503. The second connecting seat 503 has a threaded rod 505 inside... A second threaded groove 508 is provided, and a threaded rod 505 is threadedly installed in the second threaded groove 508. The threaded rod 505 can be threadedly installed inside the second connecting seat 503 through the connection with the second threaded groove 508. A threaded cylinder 504 is provided on the side wall of the second connecting seat 503 away from the first connecting seat 502. A third threaded groove 510 is provided inside the lead rod 3. The threaded cylinder 504 can be threadedly installed inside the lead rod 3 through the threaded connection with the third threaded groove 510. The threaded rod 505 can also move through the second connecting seat 503 and extend into the inner cavity of the threaded cylinder 504 to expand the range of variation of the overall length of the push rod 5.

[0038] To ensure that the threaded rod 505 and the threaded cylinder 504 are not prone to loosening, in this embodiment, two first locking nuts 509 are threadedly installed on the outer wall of the threaded rod 505. The two first locking nuts 509 are sequentially abutted against the side wall of the second connecting seat 503 away from the threaded cylinder 504, and the internal threads of the two first locking nuts 509 are arranged in opposite directions. Similarly, two second locking nuts 511 are threadedly installed on the outer wall of the threaded cylinder 504. The two second locking nuts 511 are sequentially abutted against the side wall of the lead screw 3 close to the threaded cylinder 504, and the internal threads of the two second locking nuts 511 are arranged in opposite directions. The placement of the two first locking nuts 509 restricts the position of the threaded rod 505 to prevent loosening, and the placement of the two second locking nuts 511 restricts the position of the threaded cylinder 504 to prevent loosening.

[0039] With the aforementioned setup, when assembling the push rod 5, the push seat 501 can be installed on the first connecting seat 502 by the cooperation of the threaded post 506 and the first threaded groove 507. Then, two first locking nuts 509 are screwed into the threaded rod 505. The threaded rod 505 on the first connecting seat 502 is then installed on the second connecting seat 503 through the second threaded groove 508. The threaded rod 505 is then housed in the inner cavity of the threaded cylinder 504 installed on the second connecting seat 503. The first connecting seat 502 and the second connecting seat 503 are then assembled, thus completing the assembly of the push rod 5. Then, two second locking nuts 511 are screwed into the threaded cylinder 504. Finally, the threaded cylinder 504 is installed into the third threaded groove 510 and housed inside the screw rod 3, thus assembling the push rod 5 and the screw rod 3 together. The lead screw 3 and the push rod 5 can form the push rod in the prior art. In this embodiment, by splitting the push rod into the lead screw 3 and the push rod 5, the length of the push rod is shortened, and the lead screw 3 and the push rod 5 can be carried separately. This avoids the inconvenience of carrying the push rod due to its long length occupying a lot of transportation space, saving time and effort and facilitating the handling work. Moreover, when any part on the push rod is damaged, the push rod 5 and the lead screw 3 can be separated, and the top seat 501, the first connecting seat 502, the second connecting seat 503 and the lead screw 3 can be replaced separately. This avoids the situation where the entire push rod needs to be replaced to continue using it, reducing resource waste, lowering maintenance costs, and facilitating subsequent maintenance work.

[0040] When the length of the push rod 5 needs to be adjusted, the threaded rod 505 mounted on the first connecting seat 502 is rotated in the second threaded groove 508 by turning the first connecting seat 502, so that the threaded rod 505 extends out of the threaded cylinder 504. The distance between the first connecting seat 502 and the second connecting seat 503 is adjusted, and then the two first locking nuts 509 on the outer wall of the threaded rod 505 are turned so that the two first locking nuts 509 with opposite thread directions are pressed tightly against the end face of the second connecting seat 503 in sequence. The threaded rod 505 is tightened to prevent the threaded rod 505 from shifting after the adjustment position. The length of the push rod 5 can be adjusted according to the distance between the bearing position and the shaft section of the hydraulic coupling. The push rod 5 can be used to disassemble hydraulic couplings at different depth positions on the main shaft, so that it can be used to disassemble different models of hydraulic couplings.

[0041] When adjusting the length of the push rod, the threaded cylinder 504 on the second connecting seat 503 is turned to extend the third threaded groove 510, adjusting the distance between the push rod 5 and the lead screw 3. Then, the two second locking nuts 511 on the outer wall of the threaded cylinder 504 are turned so that the two second locking nuts 511 with opposite thread directions are pressed tightly against the end face of the lead screw 3, tightening the threaded cylinder 504 to prevent displacement after adjustment. This completes the adjustment of the push rod length. By adjusting the length of the push rod, the stroke length of the push rod in the hydraulic cylinder 1 can be changed, making the push rod suitable for disassembling different models of hydraulic couplings. This avoids the trouble of having to carry and replace push rods of different lengths to disassemble hydraulic couplings with bearings at different depths due to a fixed push rod length, saving time and effort and improving disassembly efficiency.

[0042] To facilitate the installation of the connecting sleeve 2 and the hydraulic cylinder 1, in this embodiment, symmetrically arranged second limiting beads 14 are elastically installed on the output end of the hydraulic cylinder 1. A second locking groove 15, corresponding to the second limiting beads 14, is formed on the side wall of the connecting sleeve 2. The second limiting beads 14 on both sides are engaged and installed inside the corresponding second locking groove 15. When the limiting beads on both sides are engaged and installed inside the corresponding second locking groove 15, the connecting sleeve 2 can be installed on the hydraulic cylinder 1. When it is necessary to remove the connecting sleeve 2 from the hydraulic cylinder 1, the connecting sleeve 2 can be disassembled by pressing the second limiting beads 14 on both sides away from the corresponding second locking groove 15.

[0043] To facilitate the rotation of the lead screw 3, in this embodiment, a rotation handle 16 is also provided on one end of the lead screw 3.

[0044] The working principle of this invention is as follows: When disassembling the hydraulic coupling on the spindle, the connecting sleeve 2 can be installed on the end face of the output end of the hydraulic cylinder 1, and the connecting sleeve 2 can be installed in the disassembly hole of the hydraulic coupling through the threaded sleeve 4. Then, the first connecting seat 502 is turned to drive the threaded rod 505 installed on it to rotate in the second threaded groove 508, so that the threaded rod 505 extends out of the threaded cylinder 504. The distance between the first connecting seat 502 and the second connecting seat 503 is adjusted, and the two first connecting seats on the outer wall of the threaded rod 505 are turned. Tighten the first locking nut 509 so that the two first locking nuts 509 with opposite thread directions are successively pressed against the end face of the second connecting seat 503, tighten the threaded rod 505 to prevent displacement of the threaded rod 505 after adjustment, and complete the length adjustment of the push rod 5. Then turn the threaded cylinder 504 on the second connecting seat 503 to extend the threaded cylinder 504 into the third threaded groove 510, adjust the distance between the push rod 5 and the lead screw 3, and then turn the two second locking nuts 511 on the outer wall of the threaded cylinder 504 to make the two second locking nuts with opposite thread directions press against the end face of the second connecting seat 503. Tighten nuts 511 to press against the end face of lead screw 3, and tighten threaded sleeve 504 to prevent displacement of threaded sleeve 504 after adjustment, thus completing the length adjustment of the push rod. Finally, install the push rod into hydraulic cylinder 1, allowing lead screw 3 to be threaded into the interior of hydraulic cylinder 1. This pushes the adjusted push rod 5, mounted at one end, through the connecting sleeve 2 and threaded sleeve 4, into contact with the main shaft, thereby driving hydraulic cylinder 1 to work. This causes lead screw 3, mounted in hydraulic cylinder 1, to push push rod 5, generating axial force to tighten the main shaft and allow the... The connecting sleeve 2, installed in the disassembly hole through the threaded sleeve 4, generates a reaction force to pull the hydraulic coupler, thus removing the hydraulic coupler from the spindle. The length of the push rod can be adjusted according to the distance between the bearing position and the shaft section of the hydraulic coupler, so that the push rod can be used to disassemble different models of hydraulic couplers. This avoids the trouble of having to carry and replace push rods of different lengths to disassemble hydraulic couplers with bearing positions at different depths due to the fixed length of the push rod, saving time and effort and improving disassembly efficiency.

[0045] Moreover, when the threads on the threaded sleeve 4 are damaged by stress over a long period of time, the threaded sleeve 4 can be directly separated from the connecting sleeve 2 and the threaded sleeve 4 on the connecting sleeve 2 can be replaced separately. This avoids the situation where the entire connecting module needs to be replaced before it can be installed in the disassembly hole to disassemble the hydraulic coupling due to the threads on the connecting module being damaged by stress, thus reducing the waste of spare parts and lowering the cost of use.

[0046] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A puller for hydraulic coupling repair, comprising a hydraulic cylinder (1) and a connecting sleeve (2), a screw rod (3) is internally threaded mounted on the hydraulic cylinder (1), the connecting sleeve (2) is mounted on the end face of the output end of the hydraulic cylinder (1) and is externally sleeved on the screw rod (3), characterized in that: The connecting sleeve (2) is internally provided with a threaded sleeve (4), the threaded sleeve (4) is outwardly extended from the end of the connecting sleeve (2) away from the hydraulic oil cylinder (1), and the threaded sleeve (4) is detachably connected with the connecting sleeve (2), the end of the lead screw (3) close to the connecting sleeve (2) is movably arranged in the threaded sleeve (4), the end of the lead screw (3) arranged in the threaded sleeve (4) is provided with a telescopic rod (5) with variable length, and the telescopic rod (5) is arranged outside the threaded sleeve (4). ​ 2. A puller for hydraulic couplings according to claim 1, characterised in that: The connecting sleeve (2) is internally provided with a threaded sleeve (4), the threaded sleeve is outwardly extended from the end of the connecting sleeve (2) away from the hydraulic oil (1), and the threaded sleeve (4) is detachably connected with the connecting sleeve (4), the end of the lead screw (3) close to the connecting sleeve (2) is arranged in the threaded sleeve (4), the end of the lead screw (3) arranged in threaded sleeve (4) is provided with a telescopic rod (5) with variable length, the telescopic rod (5) is arranged outside the threaded sleeve (4).

3. A puller for hydraulic couplings according to claim 2, characterised in that: The end of the connecting sleeve (2) away from the hydraulic oil cylinder (1) is further provided with a through opening (8), the through opening (8) is in communication with the anti-rotation tooth groove (6), the threaded sleeve (4) is arranged through the through opening (8), and the end face area of the limiting tooth plate (7) is greater than the opening area of the through opening (8).

4. A puller for hydraulic couplings according to claim 3, characterised in that: The end of the connecting sleeve (2) away from the hydraulic oil cylinder (1) side is provided with a limiting cylinder (9) surrounding the outside of the through opening (8), the threaded sleeve (4) is arranged through the limiting cylinder (9), the outer wall of the threaded sleeve (4) is provided with a placing groove (10), the first limiting clamping bead (12) is elastically installed in the placing groove (10) by the spring (11), and the inner wall of the limiting cylinder (9) is provided with a first clamping groove (13) matched with the first limiting clamping bead (12), and the first limiting clamping bead (12) is clamped and installed in the first clamping groove (13).

5. A puller for hydraulic couplings according to claim 1, characterised in that: The telescopic rod (5) comprises a top seat (501), a first connecting seat (502) and a second connecting seat (503) arranged in sequence in the direction close to the lead screw (3), the top seat (501) is threadedly installed at one end of the first connecting seat (502), a threaded cylinder (504) is arranged on the side wall away from the first connecting seat (502) of the second connecting seat (503), the threaded cylinder (504) is threadedly installed in the lead screw (3), a threaded rod (505) is arranged on the side wall close to the second connecting seat (503) of the first connecting seat (502), and the threaded rod (505) is threadedly installed in the second connecting seat (503) and extends to the inner cavity of the threaded cylinder (504) after movably penetrating through the second connecting seat (503).

6. A puller for hydraulic couplings according to claim 5, characterised in that: The side wall close to the first connecting seat (502) of the top seat (501) is provided with a threaded column (506), and the first connecting seat (502) is internally provided with a first threaded groove (507), and the threaded column (506) is threadedly installed in the first threaded groove (507).

7. A puller for hydraulic couplings according to claim 5, characterised in that: The second connecting seat (503) is internally provided with a second threaded groove (508), the threaded rod (505) is threadedly installed in the second threaded groove (508), two first locking nuts (509) are threadedly installed on the outer wall of the threaded rod (505), the two first locking nuts (509) are sequentially and tightly attached to the side wall of the second connecting seat (503) away from the threaded barrel (504), and the internal thread directions of the two first locking nuts (509) are oppositely arranged.

8. A puller for hydraulic couplings according to claim 5, characterised in that: The screw rod (3) is internally provided with a third threaded groove (510), the threaded barrel (504) is threadedly installed in the screw rod (3) by being threadedly connected with the third threaded groove (510), two second locking nuts (511) are threadedly installed on the outer wall of the threaded barrel (504), the two second locking nuts (511) are sequentially and tightly attached to the side wall of the screw rod (3) close to the threaded barrel (504), and the internal thread directions of the two second locking nuts (511) are oppositely arranged.

9. A puller for hydraulic couplings according to claim 1, characterised in that: The output end of the hydraulic oil cylinder (1) is elastically installed with a second limiting clamping bead (14), the side wall of the connecting sleeve (2) is internally provided with a second clamping groove (15) which is correspondingly arranged with the second limiting clamping bead (14), and the second limiting clamping bead (14) is clamped and installed in the second clamping groove (15).

10. A puller for hydraulic couplings according to claim 1, characterised in that: The screw rod (3) is further provided with a rotating handle (16) on one side end.

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