Split type pin pulling tool

Abstract

The utility model relates to the field of mechanical engineering, and discloses a split type pin pulling tool which comprises a first screw rod and a second screw rod, the left side of the first screw rod is in threaded connection with a pin, and the left side and the right side of the second screw rod are in threaded connection with connecting assemblies used for connecting the first screw rod and the second screw rod. Wherein the right side of the interior of one connecting assembly is in threaded connection with a third screw rod, a supporting cover is arranged outside the pin, a plurality of replacement holes are formed in the exterior of the supporting cover, a hydraulic jack is arranged on the right side of the supporting cover, a locking nut is arranged on the right side of the hydraulic jack, and the connecting assemblies comprise a plurality of lengthened nuts. And the left side of the interior of one lengthened nut is in threaded connection with the right side of the first screw rod. According to the pin pulling mechanism, the problems that the space is narrow and the pin cannot be pulled are solved by adopting segmented and graded pin pulling, and the pin pulling mechanism adopts a split structure, is convenient to operate and convenient to move and use due to the fact that only 14 kilograms of the heaviest component is adopted.

Description

Technical Field

[0001] The utility model relates to the field of mechanical engineering, in particular to a split pin pulling tool. Background Art

[0002] During routine maintenance and overhaul of large equipment, pins, shafts, and other fasteners must be frequently removed and installed. Pin removal tools enable quick and safe removal of fasteners without damaging the equipment or parts. Many connections in construction machinery rely on pins. Using a pin removal tool can help expedite component removal and installation, facilitating replacement or repair.

[0003] However, the existing pinning devices are of two types: hydraulic and mechanical. 1. The hydraulic pinning device is particularly bulky due to the presence of a hydraulic station and an oil cylinder. It is difficult to operate with manpower without lifting equipment. Not only is the operation difficult, but more importantly, the pinning space is less than twice the length of the pin, making it impossible to pull out the pin. If a short support is used, the pin shaft cannot be completely pulled out, and multiple hydraulic cylinders must be used to pull out the pins in sections, which is costly and difficult to operate. If a long support is used, the tooling cannot be removed after the pin is pulled out. 2. If a mechanical pinning device is used, there is also the problem of small pinning space and inability to pull out the pins. Moreover, mechanical pinning relies on mechanical screw transmission to complete the pinning action, which is laborious and inefficient. Therefore, a split pinning tooling is proposed to solve the above problems. Utility Model Content

[0004] In order to make up for the above shortcomings, the utility model provides a split pin pulling tool, which aims to improve the problem of narrow space and inability to pull pins in the prior art.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A split pin extraction tool comprises a first screw and a second screw, wherein the left side of the first screw is threadedly connected to a pin, and the left and right sides of the second screw are threadedly connected to connection components for connecting the first and second screws, wherein the right side of one of the connection components is threadedly connected to a third screw, a support cover is provided on the outside of the pin, a plurality of replacement holes are opened on the outside of the support cover, a hydraulic jack is provided on the right side of the support cover, and a locking nut is provided on the right side of the hydraulic jack;

[0007] As a further description of the above technical solution:

[0008] The connecting assembly includes a plurality of lengthened nuts, wherein the inner left side of one of the lengthened nuts is threadedly connected to the right side of the first screw, and the inner right side of the lengthened nut is threadedly connected to the left side of the second screw, and the inner left side of another lengthened nut is threadedly connected to the right side of the second screw, and the inner right side of the lengthened nut is threadedly connected to the left side of the third screw;

[0009] As a further description of the above technical solution:

[0010] The outer portion of the screw rod 3 is rotatably connected to the middle portion of the support cover, and the right side of the screw rod 3 is slidably connected to the middle portion of the hydraulic jack;

[0011] As a further description of the above technical solution:

[0012] The middle portion of the locking nut is threadedly connected to the outer right side of the screw rod three, and a fixing nut is provided at the bottom of the pin.

[0013] The utility model has the following beneficial effects:

[0014] 1. In the utility model, screw one is screwed into the threaded hole of the pin, and then screw one and two screw twos are connected with an extended nut. The screw spacing is about 5 mm, which ensures that the connection is firm and that the two screws are fixed and cannot be disassembled, thereby completing the installation of the screw on the pin. When the screw needs to be disassembled, the screw replacement port is used to first remove one of the screw two and reconnect it, then loosen the connection between the screw three and the screw one, remove the hydraulic jack, loosen the support cover fixing screws, remove the support cover, take out the pin, and then complete the pin pulling. In addition, the use of segmented and graded pin pulling solves the problem of narrow space and inability to pull the pin, and the pin pulling mechanism adopts a split structure, which is easy to operate. The heaviest component is only 14 kg, and it is easy to move and use.

[0015] 2. In this utility model, the original hydraulic machine station mechanism is replaced with a hollow hydraulic jack, and the working device is reduced from more than 100 kilograms to 5 kilograms, which ensures the pressure and speed of the hydraulic system while taking into account the operability of the mechanical tooling. One person can complete the work quickly, achieving the purpose of high efficiency and portability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a three-dimensional schematic diagram of a split pin pulling tool proposed by the utility model;

[0017] Figure 2 This is a structural schematic diagram of a support cover of a split pin extraction tool proposed in the present invention;

[0018] Figure 3 The utility model provides a structural schematic diagram of a lengthened nut of a split pin pulling tool.

[0019] Legend:

[0020] 1. Screw 1; 2. Screw 2; 3. Screw 3; 4. Pin; 5. Fixing nut; 6. Support cover; 7. Replacement hole; 8. Locking nut; 9. Hydraulic jack; 10. Extension nut. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Reference Figures 1 to 3 The present invention provides an embodiment of a split pin pulling tool, comprising a screw rod 1 and a screw rod 2, the left side of the screw rod 1 is threadedly connected to a pin 4, so that the pin 4 can provide support for the screw rod 1, and the left and right sides of the screw rod 2 are threadedly connected to a connecting component for connecting the screw rod 1 and the screw rod 2, and then the screw rod 1 and the screw rod 2 are connected through the connecting component, and the inner right side of one of the connecting components is threadedly connected to the screw rod 3, and the connecting component includes a plurality of lengthened nuts 10, the inner left side of one of the lengthened nuts 10 is threadedly connected to the right side of the screw rod 1, and then the screw rod 1 can provide support for one of the lengthened nuts 10, and the inner right side of the lengthened nut 10 is threadedly connected to the left side of the screw rod 2, so that one of the lengthened nuts 10 can provide support for the screw rod 2, and the inner left side of the other lengthened nut 10 is threadedly connected to the left side of the screw rod 2. The side thread is connected to the right side of screw rod 2 2, so that screw rod 2 2 can provide support for another lengthened nut 10. The internal right side of the lengthened nut 10 is threadedly connected to the left side of screw rod 3 3, and then another lengthened nut 10 can connect screw rod 3 3 and screw rod 2 2. A support cover 6 is provided on the outside of the pin 4, and the external rotation of screw rod 3 3 is connected to the middle part of the support cover 6. A plurality of replacement holes 7 are provided on the outside of the support cover 6, and screw rod 1 1, screw 2 2 or screw rod 3 3 can be replaced through the replacement holes 7. A hydraulic jack 9 is provided on the right side of the support cover 6, and the right side of screw rod 3 3 is slidingly connected to the middle part of the hydraulic jack 9. A locking nut 8 is provided on the right side of the hydraulic jack 9, and the middle part of the locking nut 8 is threadedly connected to the external right side of screw rod 3 3, so that the locking nut 8 can be fixed to the hydraulic jack 9 by rotating it on the outside of screw rod 3 3. A fixing nut 5 is provided at the bottom of the pin 4.

[0023] Working principle: First, screw the screw 1 into the threaded hole of the pin 4, and control the screwing depth to 40 mm. This step lays the foundation for subsequent connection, fixes the screw and pin 4, and ensures that they will not loosen during the pin removal process.

[0024] Next, use the extended nut 10 to connect screw 1 to the two screws 2. The spacing between screws 2 is set to approximately 5 mm, which ensures a secure connection and prevents the two screws from separating. This connection method increases operational stability and prevents the screws from falling off during pin removal.

[0025] Then, screw rod 3 is placed inside support cover 6, and support cover 6 is firmly fixed on the stop pin block by bolts. This step avoids the need for hand-held clamps in traditional operations through the fixing effect of support cover 6, and improves the stability and safety of operation.

[0026] At this time, release the safety relief valve of the hydraulic jack 9 and press the piston rod to the innermost part of the stroke to provide enough space for the next operation. At the same time, ensure that the safety valve is in the released state to avoid the safety hazards caused by sudden hydraulic pressure relief during subsequent operations.

[0027] Gently move the screw rod 3 toward the inside of the support cover 6 and place the hydraulic jack 9 in the position shown in the figure. If the screw rod is not moved inward at this time, there may be interference with the screw rod, making it impossible to accurately place the hydraulic jack 9 in the preset position. Therefore, this step requires the operator to carefully confirm the position of the screw rod to ensure the accuracy of placement.

[0028] After that, pull out the screw rod 3 and insert it into the center hole of the hydraulic jack 9. Use the extension nut 10 to connect the screw rod 2 and screw rod 3, keeping a distance of about 5 mm between the screw rods. This operation ensures the firmness of the connection and prevents the screw rod from loosening when the pin is pulled out.

[0029] Use the locking nut 8 to lock the hydraulic jack 9 to prevent displacement or loosening during the pin extraction process. Locking ensures the stability of the entire system and improves the accuracy of the operation.

[0030] Next, tighten the safety relief valve of the hydraulic jack 9, compress the handle to push the piston rod of the hydraulic jack 9 to extend, and gradually pull out the pin 4 about 100 mm. This step needs to be done slowly to avoid damage to the components due to excessive pressure.

[0031] After the pin 4 is pulled out, loosen the jack locking screw and the safety relief valve of the hydraulic jack 9 at the same time, and press the piston rod to the innermost side of the stroke again. The purpose of doing this is to readjust the piston rod position for subsequent operations to avoid affecting the next pin removal step.

[0032] Through the screw replacement port, remove one screw 2 and reconnect it to prepare for the next pin removal operation. Since the pin 4 may be long, the screws are removed step by step to adapt to operations of different lengths. Repeatedly lock the hydraulic jack 9 with the locking nut 8, tighten the safety pressure relief valve, compress the handle, push out the hydraulic jack 9, pull out the pin 4 a distance of 100mm, loosen the jack locking screw, loosen the hydraulic jack 9 safety pressure relief valve, press the piston rod to the innermost side of the stroke, through the screw replacement hole 7, remove one screw 2, reconnect it, and push the hydraulic jack 9 again to pull out part of the distance of the pin 4 to further dislodge the pin 4.

[0033] During the repetitive process, the remaining screw rod 2 2 is completely removed through the screw rod replacement port, so that the screw rod 3 3 is reconnected with the screw rod 1 1 to continue the subsequent pin extraction operation.

[0034] Continue to repeat the above steps and pull out the pin again to ensure that the pin 4 gradually disengages from the original hole position. Loosen the jack locking screw again, and loosen the safety pressure relief valve of the hydraulic jack 9, press the piston rod to the innermost side, and ensure that the jack returns to a safe state after the operation is completed. At the same time, loosen the locking screw to prepare for disassembly. Loosen the connection between screw three 3 and screw one 1, and remove the hydraulic jack 9. This operation removes the hydraulic device from the screw and support cover 6, facilitating the subsequent disassembly of the support cover 6. Loosen the fixing screws of the support cover 6, remove the support cover 6 from the device, complete the removal of the support component, and release the last part of the pin 4. Finally, completely remove the pin 4, and the pin pulling operation is successfully completed.

[0035] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A split pin removal tool, comprising a screw rod 1 (1) and a screw rod 2 (2), characterized in that: The left side of the screw rod (1) is threadedly connected to a pin (4), and the left and right sides of the screw rod (2) are both threadedly connected to connection components for connecting the screw rod (1) and the screw rod (2), wherein the right side of the interior of one of the connection components is threadedly connected to the screw rod (3), and a support cover (6) is provided on the outside of the pin (4), and a plurality of replacement holes (7) are provided on the outside of the support cover (6), and a hydraulic jack (9) is provided on the right side of the support cover (6), and a locking nut (8) is provided on the right side of the hydraulic jack (9).

2. A split pin removal tool according to claim 1, characterized in that: The connecting assembly includes a plurality of lengthened nuts (10), wherein the inner left side of one of the lengthened nuts (10) is threadedly connected to the right side of the first screw (1), and the inner right side of the lengthened nut (10) is threadedly connected to the left side of the second screw (2); and the inner left side of another lengthened nut (10) is threadedly connected to the right side of the second screw (2), and the inner right side of the lengthened nut (10) is threadedly connected to the left side of the third screw (3).

3. The split pin pulling tool according to claim 1, characterized in that: The outer portion of the screw rod three (3) is connected to the middle portion of the support cover (6) through rotation, and the right side of the screw rod three (3) is connected to the middle portion of the hydraulic jack (9) through sliding.

4. The split pin pulling tool according to claim 1, characterized in that: The middle portion of the locking nut (8) is threadedly connected to the outer right side of the screw rod (3), and a fixing nut (5) is provided at the bottom of the pin (4).

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