Anti-pull-out wheel

Abstract

The utility model relates to maintenance tool technical field discloses a kind of anti-pulling wheel devices, including nut, with the screw rod being connected in nut through thread, at least two support arms being arranged around nut along circumferential direction and the draw hook being arranged on each support arm, pull rod is equipped between the draw hook and screw rod, second pin is inserted on the support arm, the side of draw hook upper portion close to screw rod is rested on second pin, one end of pull rod is hinged with the middle part of draw hook, other end is hinged with the part between second pin and nut of support arm.In work, pull rod pulls draw hook, and simultaneously, because the outer circle of draw hook upper portion is rested on second pin, according to lever principle, the pulling force of pull rod acting on draw hook will exert clamping force towards screw rod axis to the hook tip of draw hook bottom, so as to clamp the component to be disassembled, prevent the hook tip from loosening from pulley, and then cause the disassembly failure of the component to be disassembled.

Description

Technical Field

[0001] This utility model relates to the field of maintenance tool technology, and in particular to an anti-detachment puller. Background Technology

[0002] A puller (also known as a puller) is a common disassembly tool used to remove pulleys, bearings, couplings, and other components from the shaft end.

[0003] When using a puller, first hook the pullers onto the end faces of pulleys, bearings, couplings, and other components near their outer diameters. Then, turn the lead screw so that its end presses against the end of the shaft. As the lead screw rotates, the pulleys, bearings, couplings, and other components gradually move outward and eventually disengage from the shaft.

[0004] Because the puller only contacts the edges of components such as pulleys, bearings, and couplings with its hook tip during operation, the hook tip wears down due to long-term friction, causing the area near the center of the component to thin and form a bevel. When the puller is subjected to tension, the hook tip can easily expand outwards and slip off these components, leading to disassembly failure.

[0005] Patent CN217943221U discloses an adjustable puller, comprising: a base, a top rod, several pull rods, and several claws corresponding to the pull rods. The top rod is screwed to the base, and the pull rods are fixedly connected to the base. Each claw has a first ratchet structure, and each pull rod has a second ratchet structure corresponding to the first ratchet structure. A sliding sleeve is provided at the end of each pull rod, and the claws are slidably connected to the sliding sleeve. By providing a ratchet structure between the claws and pull rods, the claws and pull rods can quickly engage and disengage, thereby quickly adjusting the relative position of the claws and top rod, facilitating operation and use, and reducing the labor intensity of workers. However, when the claws wear down, they will generate an outward component force under tension, causing the claws to slip off. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide an anti-detachment puller to solve the problem that the hook tip of the puller is easy to slip off the disassembled part after long-term use.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0008] An anti-detachment puller includes a nut, a lead screw threadedly connected to the nut, at least two support arms arranged circumferentially around the nut, and a hook on each support arm. A pull rod is provided between the hook and the lead screw. A second pin is inserted into the support arm. The upper part of the hook near the lead screw abuts against the second pin. One end of the pull rod is hinged to the middle of the hook, and the other end is hinged to the support arm located between the second pin and the nut.

[0009] Furthermore, the support arm has a notch along its length, and the upper part of the hook passes through the notch.

[0010] Furthermore, the support arm has at least two second adjustment holes along the length of the support arm near its outer end, and the second pin is inserted into one of the second adjustment holes.

[0011] Furthermore, the support arm is provided with at least two third adjustment holes between the second pin and the nut, one of which is fitted with a third pin, and the pull rod is hinged to the support arm via the third pin.

[0012] Furthermore, the hook has at least two first adjustment holes along its length in the middle, one of which has a first pin inserted into it, and the pull rod is hinged to the hook through the first pin.

[0013] Furthermore, the pull rod includes a first pull rod and a second pull rod that are hinged to each other at one end, the other end of the second pull rod is located in the notch, and the other end of the first pull rod is hinged to the pull hook.

[0014] Furthermore, the first pull rod consists of two symmetrically arranged on both sides of the second pull rod, and the hook and the second pull rod are both sandwiched between the two first pull rods.

[0015] The positive effects of this utility model are:

[0016] This utility model includes a support arm, a lead screw, and a pull hook. A second pin is mounted on the support arm, and a pull rod is positioned between the support arm and the pull hook, resting against the second pin. During operation, as the pull rod pulls the pull hook, the upper part of the pull hook rests against the outer circumference of the second pin. Based on the lever principle, the pulling force exerted by the pull rod on the pull hook applies a clamping force towards the lead screw axis to the hook tip at the bottom of the hook, thereby clamping the part to be disassembled and preventing the hook tip from detaching from the pulley, which would otherwise lead to disassembly failure. The pull hook has a first adjustment hole, and the support arm has a second and a third adjustment hole, thus allowing for a wide range of applications for the puller. This eliminates the need for multiple models; one puller can be used to disassemble various types of parts, reducing operating costs. Attached Figure Description

[0017] Figure 1This is a side view of the present invention;

[0018] Figure 2 yes Figure 1 Top view;

[0019] Figure 3 This is a diagram illustrating the use of this utility model;

[0020] Figure 4 This is a schematic diagram of the current puller's shape;

[0021] In the picture:

[0022] 1. Hook; 2. First adjustment hole; 3. First pin; 4. First pull rod; 5. Second pull rod; 6. Second adjustment hole; 7. Second pin; 8. Support arm; 9. Third adjustment hole; 10. Third pin; 11. Lever; 12. End cap; 13. Lead screw; 14. Nut; 15. Pull rod; 16. Notch; 17. Motor; 18. Pulley; 19. Hook tip. Detailed Implementation

[0023] Figure 4 The diagram illustrates the shape of a commonly used puller, including a nut 14, a vertical lead screw 13 threadedly connected to the nut 14, three lateral support arms 8 arranged circumferentially around the nut 14, and a vertical hook 1 on each support arm 8. The three support arms 8 and the nut 14 are integrally cast and machined from cast steel. The top of the lead screw 13 is an end cap 12, on which a lever 11 passes. The upper part of the hook 1 is fitted onto the support arm 8; moving the hook 1 along the support arm 8 adjusts the distance between the hook 1 and the nut 14 to accommodate parts of different sizes.

[0024] Example 1

[0025] like Figure 1 and Figure 2 As shown, an anti-detachment puller is an improvement on the aforementioned puller. The upper part of the hook 1 is no longer fitted onto the support arm 8. An inclined pull rod 15 is provided between the hook 1 and the lead screw 13, with the upper end of the pull rod 15 close to the nut 14 and the lower end away from the nut 14. A second pin 7 is inserted into the outer part of the support arm 8, and the upper end of the pull rod 15 is hinged to the middle of the hook 1, while the lower end is hinged to the part of the support arm 8 located between the second pin 7 and the nut 14.

[0026] Figure 3The diagram shows the present invention used for disassembling the pulley 18 on the shaft of motor 17. When disassembling the pulley 18, firstly, hook the tips 19 of the three hooks 1 onto the bottom surface of the pulley 18, with the corner of the inner root of the hook tip 19 abutting the edge of the pulley 18. Then, turn the lever 11, causing the lead screw 13 to rotate, so that the bottom of the lead screw 13 abuts against the center of the end of the motor 17 shaft. As the lead screw 13 rotates, it causes the support arm 8 to move upward, and the upper parts of the three hooks 1 retract towards the lead screw 13. As the upper parts of the three hooks 1 approach the lead screw 13, they move downward relative to the second pin 7 until the inner side of the upper part of the hook 1 abuts against the outer circle of the second pin 7. Then, continue turning the lever 11, moving the support arm 8 upward, and pulling the hooks 1 via the pull rod 15, thereby moving the pulley 18 upward until the pulley 18 is pulled off the shaft of motor 17.

[0027] As the lever 15 pulls the hook 1 upward, the upper part of the hook 1 abuts against the outer circle of the second pin 7. According to the lever principle, the pulling force exerted by the lever 15 on the hook 1 will apply a clamping force towards the center of the pulley 18 to the hook tip 19 at the bottom of the hook 1. This will cause the hook tip 19 to be pressed tightly against the edge of the pulley 18, thereby preventing the hook tip 19 from coming off the pulley 18 and causing the pulley 18 to fail to disassemble.

[0028] Example 2

[0029] The difference between this embodiment and Embodiment 1 is that:

[0030] Each support arm 8 has an elongated notch 16 along its length, connecting the upper and lower surfaces of the support arm 8. The upper part of the hook 1 passes through the corresponding notch 16, and the second pin 7 passes through the support arm 8 in a direction perpendicular to the axis of the lead screw 13. The notch 16 guides the upper part of the hook 1, preventing the upper part of the hook 1 from slipping off the second pin 7, which would cause the hook tip 19 to detach from the pulley 18.

[0031] The pull rod 15 includes a first pull rod 4 and a second pull rod 5 hinged to each other at one end. The thickness of the second pull rod 5 is the same as the thickness of the hook 1. The other end of the second pull rod 5 is located in the notch 16. The other end of the first pull rod 4 is hinged to the middle of the hook 1. There are two first pull rods 4 symmetrically arranged on both sides of the second pull rod 5 on each hook 1. Both the hook 1 and the second pull rod 5 are sandwiched between the two first pull rods 4.

[0032] The support arm 8 pulls the first pull rod 4 via the second pull rod 5, which in turn pulls the hook 1. The two first pull rods 4 can apply the pulling force to both sides of the hook 1, so that the force on both sides of the hook 1 is balanced, thereby preventing the hook 1 from twisting due to excessive pulling force, which would cause excessive friction with the inner wall of the notch 16 and wear out too quickly, or cause the notch 16 to be stretched and deformed when twisted.

[0033] Furthermore, configuring the pull rod 15 as a hinged first pull rod 4 and a second pull rod 5 allows for better adjustment of the position of the hook 1. For example, pressing the outer side of the hook 1 inward allows the first pull rod 4 and the second pull rod 5 to rotate relative to each other, so that the upper part of the hook 1 rests against the second pin 7. When the lead screw 13 is turned, the first pull rod 4 and the second pull rod 5 are gradually pulled to the same straight line, thereby preventing the hook tip 19 from slipping off the pulley 18 when it is released.

[0034] Example 3

[0035] The difference between this embodiment and Embodiment 2 is that:

[0036] Five second adjustment holes 6 are provided on the support arm 8 along the length of the support arm 8 near its outer end, and a second pin 7 is inserted into one of the second adjustment holes 6.

[0037] The support arm 8 is provided with three third adjustment holes 9 between the second pin 7 and the nut 14. A third pin 10 is inserted into one of the third adjustment holes 9. The third pin 10 passes through the support arm 8 and the upper end of the second pull rod 5. The second pull rod 5 is hinged to the support arm 8 through the third pin 10.

[0038] The middle part of the hook 1 is provided with three first adjustment holes 2 along its length. A first pin 3 is inserted into one of the first adjustment holes 2. The first pin 3 passes through the hook 1 and the lower ends of the two first pull rods 4. The lower ends of the first pull rods 4 are hinged to the hook 1 through the first pin 3.

[0039] The distance between the three hooks 1 can be adjusted by changing the positions of the second pin 7 and the third pin 10, thus accommodating couplings 18 of different diameters. The hooks 1 can also be adjusted to an inclined position (in which case the distance between the contact point of the second pin 7 and the hook 1 and the axis of the lead screw 13 is greater than the radius of the pulley 18). Even if the contact area between the hook tip 19 and the pulley 18 is worn into an inclined surface, this can be compensated for by tilting the hook 1, further preventing the hook tip 19 from slipping off the pulley 18. Simultaneously, the inclined hook 1 also avoids side contact between the hook 1 and the pulley 18, concentrating the horizontal inward component of the pulling force applied by the first pull rod 4 onto the hook tip 19, thereby preventing the hook tip 19 from slipping off the pulley 18.

[0040] By adjusting the position of the first pin 3, this invention can be adapted to pulleys 18 of different thicknesses, thereby reducing the distance between the support arm 8 and the pulley 18 when disassembling the pulley 18, that is, reducing the length of the lead screw 13 extending below the support arm 8, so that this invention is more stable and less prone to shaking when disassembling the pulley 18.

[0041] The above-described embodiments are detailed and specific, illustrating preferred embodiments of the present utility model. They are only used to illustrate the technical ideas and features of the present utility model, with the aim of enabling those skilled in the art to understand the content of the present utility model and implement it accordingly. However, they are not limited to the present utility model, and the patent scope of the present utility model cannot be limited by this embodiment alone. That is, any equivalent changes or modifications made to the spirit disclosed in the present utility model, without departing from the structure of the present utility model, such as local improvements within the system and modifications or transformations between subsystems, are still within the patent scope of the present utility model.

Claims

1. A wheel chock comprising a nut (14), a threaded spindle (13) which is screwed through the nut (14), at least two support arms (8) which are arranged around the nut (14) in the circumferential direction, and a draw hook (1) which is arranged on each support arm (8), characterized in that A pull rod (15) is provided between the hook (1) and the lead screw (13). A second pin (7) is inserted into the support arm (8). The upper part of the hook (1) near the lead screw (13) abuts against the second pin (7). One end of the pull rod (15) is hinged to the middle of the hook (1), and the other end is hinged to the part of the support arm (8) located between the second pin (7) and the nut (14).

2. A wheel chock according to claim 1, wherein The support arm (8) has a notch (16) along its length, and the upper part of the hook (1) passes through the notch (16).

3. A wheel chock according to claim 1 or 2, characterised in that The support arm (8) has at least two second adjustment holes (6) along the length of the support arm (8) near its outer end, and the second pin (7) is inserted into one of the second adjustment holes (6).

4. A wheel chock according to claim 1 or 2, wherein The support arm (8) has at least two third adjustment holes (9) between the second pin (7) and the nut (14), one of which has a third pin (10) inserted in it, and the pull rod (15) is hinged to the support arm (8) through the third pin (10).

5. A wheel chock according to claim 1 or 2, wherein The hook (1) has at least two first adjustment holes (2) along its length in the middle part, and a first pin (3) is inserted in one of the first adjustment holes (2). The pull rod (15) is hinged to the hook (1) through the first pin (3).

6. A wheel chock as defined in claim 2, wherein The pull rod (15) includes a first pull rod (4) and a second pull rod (5) that are hinged to each other at one end. The other end of the second pull rod (5) is located in the notch (16), and the other end of the first pull rod (4) is hinged to the hook (1).

7. A wheel chock as defined in claim 6, wherein The first pull rod (4) consists of two rods symmetrically arranged on both sides of the second pull rod (5), and the hook (1) and the second pull rod (5) are both sandwiched between the two first pull rods (4).

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