Lamarkianism

Abstract

This utility model discloses a puller chuck and a puller, belonging to the technical field of mechanical disassembly equipment. The puller chuck includes three locking blocks, each with connecting parts at both ends and a supporting part in the middle. The supporting part has a groove on its inner side and several first threaded holes perpendicular to its end face in the middle. The three locking blocks are connected and installed by a fixing device. The puller includes a bolt, a connecting plate, a screw, and the aforementioned puller chuck. The connecting plate includes a central part and a surrounding part corresponding to the first threaded hole. The central part has a second threaded hole, and the surrounding part has elongated holes radiating outward from the second threaded hole. The bolt passes through the elongated holes and is threadedly connected to the corresponding first threaded hole. The screw includes a threaded part corresponding to the second threaded hole and a torsion part. This equipment, through modular design and detachable connection, enables the disassembly of disc-type interference-fit parts, has a large load-bearing capacity, and is convenient to maintain, low in cost, and easy to promote.

Description

Technical Field

[0001] This utility model belongs to the technical field of mechanical disassembly equipment, specifically a puller chuck and puller. Background Technology

[0002] A puller is a commonly used tool in mechanical repair, mainly used to disassemble parts such as pulleys, gears, or bearings that are interference-fitted and mounted on shafts.

[0003] Currently, traditional pullers are mainly one-piece designs. Because one-piece pullers need to ensure ease of use, their claw arms are usually thin and made of cast iron. When disassembling tightly fitted or rusted workpieces, the claw arms are easily damaged, and damaged claw arms can easily fly out and cause injury. Furthermore, replacing one-piece pullers is complex and difficult to repair, making them single-use consumables. However, replacement requires consideration of procurement cycles, and advance ordering and stockpiling is not conducive to cost control, and advance stockpiling of pullers occupies storage space. Therefore, there is an urgent need for a puller that improves load-bearing capacity, extends service life, reduces maintenance difficulty, lowers maintenance costs, and increases maintenance efficiency. Utility Model Content

[0004] To address the problems of low load-bearing capacity, short service life, high maintenance costs, and poor maintenance convenience in existing pullers, this utility model provides a puller chuck and puller.

[0005] This utility model is achieved through the following technical solution:

[0006] The first aspect of this utility model provides a puller chuck, including three end-to-end connecting blocks. Each block includes a connecting part at both ends and a supporting part in the middle. One end of the inner side of the supporting part is provided with a slot, and the supporting part is provided with a plurality of first threaded holes in the direction perpendicular to the end face. The three blocks are connected and installed by a fixing device for their corresponding connecting parts.

[0007] A further improvement of this utility model is that the fixing device includes a double-ended stud and a nut, the connecting part is provided with a through hole for the double-ended stud to pass through, and nuts are connected and installed on both sides of the double-ended stud.

[0008] A further improvement of this utility model is that a first chamfer is provided at the corner of the card slot.

[0009] A further improvement of this utility model is that a second chamfer is provided at the corner between the support part and the connecting part.

[0010] The second aspect of this utility model provides a puller, including a bolt, a connecting plate, a screw, and the aforementioned puller chuck. The connecting plate includes a central portion and a peripheral portion corresponding to a first threaded hole. The central portion is provided with a second threaded hole, and the peripheral portion is provided with elongated holes radiating outward from the second threaded hole. The bolt passes through the elongated holes and is threadedly connected to the corresponding first threaded hole. The screw includes a threaded portion that is threadedly engaged with the second threaded hole and a torsion portion at the end.

[0011] A further improvement of this utility model is that the end of the threaded portion away from the torsion portion is provided with a smooth rod with a diameter smaller than that of the second threaded hole.

[0012] A further improvement of this utility model is that the torsion part is an external hexagonal head, and a boss is provided between the external hexagonal head and the threaded part.

[0013] As can be seen from the above technical solution, the beneficial effects of this utility model are as follows: In use, one of the locking blocks is removed, the puller chuck is placed on the mounting shaft of the part to be disassembled, and the locking blocks are fixed with nuts and studs. The distance between the locking blocks is adjusted so that the large end of the puller body locks the part to be disassembled. The connecting plate is fixed to the puller chuck with bolts, and then the screw is screwed into the second threaded hole. The screw is rotated with a wrench so that it presses against the mounting shaft of the part to be disassembled. As the screw is screwed in longer, the part to be disassembled will be removed from the mounting shaft. This equipment improves the load-bearing capacity by using a puller chuck. The puller chuck and puller are designed separately, allowing for detachable connection, reducing the maintenance difficulty and cost of the puller, improving maintenance efficiency, enabling the puller to be used stably for a long time, and its simple structure makes it easy to promote. Attached Figure Description

[0014] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of the puller chuck of this utility model.

[0016] Figure 2 This is a schematic diagram of the structure of the puller of this utility model.

[0017] Figure 3 This is a schematic diagram of the card block structure of this utility model.

[0018] Figure 4 This is a schematic diagram of the connecting plate structure of this utility model.

[0019] In the attached diagram: 1. Locking block, 2. Connecting part, 3. Supporting part, 4. Locking groove, 5. First threaded hole, 6. Fixing device, 7. Double-ended stud, 8. Nut, 9. Through hole, 10. First chamfer, 11. Second chamfer, 12. Bolt, 13. Connecting plate, 14. Screw, 15. Center part, 16. Surrounding part, 17. Second threaded hole, 18. Long hole, 19. Threaded part, 20. Torsion part, 21. Smooth rod, 22. External hexagonal head, 23. Boss. Detailed Implementation

[0020] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0021] like Figure 1 and Figure 3 As shown, this utility model discloses a puller chuck, including three locking blocks 1 connected end to end. Each locking block 1 includes a connecting part 2 symmetrically arranged at both ends and a support part 3 in the middle. A locking groove 4 is provided at one corner of the inner side of the support part 3. A through first threaded hole 5 is provided at the center position of the support part 3 in the direction perpendicular to the end face. If necessary, two or three first threaded holes 5 can also be provided symmetrically distributed at the center of the support part. The three locking blocks 1 are connected and installed to the corresponding connecting parts 2 by fixing devices 6.

[0022] Remove one of the clamping blocks 1 from the puller chuck, so that the puller chuck is fitted onto the mounting shaft of the workpiece to be disassembled. Then, use the fixing device 6 to firmly fix the clamping block 1 so that the clamping block 1 can hold the workpiece to be disassembled. In this way, the entire puller chuck can have a sufficiently large contact area with the workpiece to be disassembled, thereby improving the load-bearing capacity of the puller chuck. Furthermore, the modular clamping block 1 is easy to disassemble and assemble, and is convenient for maintenance and replacement.

[0023] The fixing device 6 can consist of a double-ended stud 7 and two nuts 8. The connecting part 2 has a through hole 9 for the double-ended stud 7 to pass through, and the double-ended stud 7 is nested in the through hole 9. Nuts 8 are connected and installed on both sides of the double-ended stud 7. The cooperation of the double-ended stud 7 and the nuts 8 can tighten from two directions, and the locking blocks 1 can be separated outward to accommodate workpieces of different diameters. The double-ended stud 7 allows the exposed thread lengths on both sides of the connecting part 2 to be different, which can be tightened from different directions, making it easier to find a suitable angle for tightening with an electric wrench in a confined space.

[0024] The slot 4 has a first chamfer 10 at the corner. The bottom of the slot 4 is the direct load-bearing part. The bottom of the slot 4 is connected to the side wall. The chamfer can reduce stress concentration, increase structural strength, and give the puller chuck a greater load-bearing capacity and a longer service life.

[0025] The corner between the support part 3 and the connecting part 2 is provided with a second chamfer 11. When the puller chuck needs to clamp a large workpiece to be disassembled, the connecting part 2 of the puller chuck is in a suspended state. When the double-ended stud 7 and nut 8 are tightened, the connecting part 2 is subjected to great pressure, and there is a risk of breakage between the support part 3 and the connecting part 2. By setting the chamfer, the stress concentration at this point can be reduced, the structural strength can be increased, the clamping capacity of the puller chuck can be strengthened, the load-bearing capacity can be improved, the service life can be extended, and the operating cost can be reduced.

[0026] like Figure 1-4 As shown, this utility model also discloses a puller, including three external hexagonal bolts 12, a connecting plate 13, a screw 14, and the aforementioned puller chuck. The connecting plate 13 includes a central portion 15 and a peripheral portion 16 corresponding to the first threaded hole 5. The central portion 15 is provided with a second threaded hole 17, and the peripheral portion 16 is provided with elongated holes 18 radiating outward from the second threaded hole 17. The bolts 12 pass through the elongated holes 18 and are threadedly connected to the corresponding first threaded hole 5. The screw 14 includes a threaded portion 19 that is threaded to the second threaded hole 17 and a torsion portion 20 at the end.

[0027] In use, first install the puller chuck onto the mounting shaft of the workpiece to be disassembled. Then, use three bolts 12 to pass through the elongated holes 18 and install them onto the corresponding first threaded holes 5 of the puller chuck. Adjust the screw-in length of the bolts 12 to ensure sufficient contact length between the bolts 12 and the first threaded holes 5, while keeping the connecting plate 12 parallel to the puller chuck. Then, screw the screw 14 into the second threaded hole 17 until it reaches the end face of the mounting shaft of the workpiece to be disassembled. Then, use an electric wrench to rotate the screw 14. The screw 14 will continue to screw inward, and the connecting plate 13 will pull the puller chuck through the bolts 12 to remove the workpiece from the mounting shaft. This device has a simple structure, can adapt to workpieces of different diameters, has reliable connection, high load-bearing capacity, long service life, and is convenient and quick to maintain, making it easy to promote.

[0028] It should be noted that the connecting plate 13 can also be provided with more peripheral parts 16 corresponding to other different puller chucks, so that the same connecting plate 13 can be adapted to a variety of puller chucks.

[0029] The threaded portion 19, away from the torsion portion 20, has a smooth rod 21 with a diameter smaller than the second threaded hole 17 and a length that does not affect the full thread engagement between the screw 14 and the second threaded hole 17. During use, the end of the screw 14 needs to abut against the mounting shaft of the workpiece to be disassembled, requiring a large axial force. Under pressure, it slips and rotates against the end face of the mounting shaft. Furthermore, the mounting hole of the workpiece to be disassembled may come into contact with the screw 14, damaging the thread at the end of the screw 14 and affecting its installation on the connecting plate 13. Therefore, a smooth rod 21 with a diameter smaller than the second threaded hole 17 is provided at the end of the screw 14. This not only does not affect the installation of the screw 14 on the connecting plate 13 but also protects the thread of the screw 14 from damage, improving its overall service life and reducing maintenance costs. Moreover, the smaller diameter end of the screw 14 can accommodate more workpieces with different mounting diameters.

[0030] The torsion part 20 is an external hexagon head 22, and a boss 23 is provided between the external hexagon head 22 and the threaded part 19. The external hexagon head 22 is a national standard connection. By using a socket and an electric wrench, a torsional torque can be applied to the screw 14 to disassemble some interference-fit disc-shaped parts such as pulleys, bearings and gears. The end face of the socket fits against the boss 23, which can make the socket coaxial with the screw 14, so as to better output torque.

[0031] In use, one of the clamping blocks 1 is removed, and the puller chuck is placed on the mounting shaft of the part to be disassembled. The clamping block 1 is secured with the nut 8 and the double-ended stud 7. The distance between the clamping blocks 1 is adjusted so that the large end of the clamping block 1 clamps the part to be disassembled. The connecting plate 13 is connected to the corresponding clamping block 1 via bolts 12. Then, the screw 14 is screwed into the second threaded hole 17. The screw 14 is rotated using a wrench until it presses against the mounting shaft of the part to be disassembled. As the screw 14 is screwed in longer, the part to be disassembled will be removed from the mounting shaft. This equipment, by using a puller chuck, increases the contact area between the chuck and the workpiece, improving load-bearing capacity. The separate design of the puller chuck and puller allows for detachable connection, reducing the difficulty and cost of puller maintenance, improving maintenance efficiency, and enabling long-term stable use of the puller. Furthermore, its simple structure makes it easy to promote.

[0032] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A puller chuck comprising three head-to-tail connected blocks (1), characterized in that, The card block (1) includes connecting parts (2) at both ends and a support part (3) in the middle. The inner side of the support part (3) is provided with a card groove (4). The support part (3) is provided with several first threaded holes (5) in the direction of the vertical end face. The three card blocks (1) are connected and installed to the corresponding connecting parts (2) by fixing devices (6).

2. The pull chuck of claim 1, wherein, The fixing device (6) includes a double-ended stud (7) and a nut (8). The connecting part (2) is provided with a through hole (9) for the double-ended stud (7) to pass through. Nuts (8) are connected and installed on both sides of the double-ended stud (7).

3. The pull chuck of claim 2, wherein, The card slot (4) has a first chamfer (10) at the corner.

4. The pull chuck of claim 3, wherein, A second chamfer (11) is provided at the corner between the support part (3) and the connecting part (2).

5. A puller as claimed in claim 4, c h a r a c t e r i s e d in that The device includes a bolt (12), a connecting plate (13), a screw (14), and a puller chuck as described in any one of claims 1-4. The connecting plate (13) includes a central portion (15) and a peripheral portion (16) corresponding to the first threaded hole (5). The central portion (15) is provided with a second threaded hole (17), and the peripheral portion (16) is provided with elongated holes (18) radiating outward from the second threaded hole (17). The bolt (12) passes through the elongated holes (18) and is threadedly connected to the corresponding first threaded hole (5). The screw (14) includes a threaded portion (19) that is threaded to the second threaded hole (17) and a torsion portion (20) at the end.

6. The draw ram as claimed in claim 5, characterized in that The threaded portion (19) has a smooth rod (21) with a diameter smaller than that of the second threaded hole (17) at the end away from the torsion portion (20).

7. The draw ram as defined in claim 5, wherein, The twisting part (20) is an external hexagonal head (22), and a boss (23) is provided between the external hexagonal head (22) and the threaded part (19).

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