A large pulley dismounting device

Abstract

The utility model relates to a maintenance tool, concretely relates to a dismounting device for large belt pulley. Its through the large -area clamping structure of first clamping plate and second clamping plate, cooperate hydraulic jack push top action, realize stable clamping and even force, solved the problem that traditional dismounting device clamping force is insufficient, easily leads to component damage, through the installation cooperation of first clamping plate and different specifications second clamping plate, solved the problem that traditional dismounting device adaptability is poor, has the advantage that improves clamping force and stability, adapts to different specifications belt pulley, reduces the risk of deformation, promotes security and dismounting efficiency.

Description

Technical Field

[0001] This utility model relates to a maintenance tool, specifically a disassembly device for large pulleys. Background Technology

[0002] As a widely used power transmission component in mechanical transmission systems, pulleys are usually mounted on drive shafts through key connections, tapered sleeve locking, or interference fits. During long-term operation, due to factors such as alternating loads, vibration, corrosion, wear, or bearing damage, pulleys may experience eccentricity, loosening, cracks, or fit failures, requiring regular inspection or replacement. In addition, pulleys must be removed from the shaft during equipment maintenance, motor repair, shaft alignment adjustment, or replacement of transmission components.

[0003] Traditional pulley disassembly mainly relies on three-jaw pullers, but this method has significant drawbacks in disassembling large pulleys: First, due to the large weight and tight fit of large pulleys, the contact area between the puller's claw and the pulley is small, making it difficult to provide sufficient clamping force and uniform radial tension, which can easily lead to deformation or breakage of the pulley's edge. Second, the traditional puller claw's fixing method is limited and cannot adapt to pulleys of different diameters and hub thicknesses. Third, the puller claw is prone to skew due to uneven force during operation, which not only affects disassembly efficiency but may also cause bending and deformation of the hydraulic jack piston rod, posing a safety hazard. Utility Model Content

[0004] The purpose of this application is to provide a disassembly device for large pulleys and its multi-specification adaptable structure, which has the advantages of improving clamping force and stability, adapting to pulleys of different specifications, reducing deformation risk, improving safety and disassembly efficiency.

[0005] This application provides a disassembly device for large pulleys, the technical solution of which is as follows: The device includes a base plate, a first clamping plate, and a second clamping plate. A receiving space is formed between the base plate and the first clamping plate, and the two are fixedly connected by a fixing rod. A clamping and fixing space is formed between the first clamping plate and the second clamping plate. A through hole is provided in the center of the first clamping plate, and mounting holes are arranged in a ring around the through hole. The second clamping plate is a ring structure formed by the mating of at least two arc-shaped components. Connecting holes corresponding to the mounting holes are provided on the second clamping plate, and the mounting holes and connecting holes are connected by a screw with a nut. A hydraulic jack is installed within the receiving space, and the base of the hydraulic jack is fixedly installed on the base plate. The piston rod of the hydraulic jack can extend and retract through the through hole. Furthermore, this application also proposes that the first clamping plate has mounting holes concentrically distributed on at least two different pitch circles, each mounting hole on a pitch circle corresponds to a second clamping plate, and the connecting holes on each second clamping plate correspond one-to-one with the mounting holes on its corresponding pitch circle.

[0006] As can be seen from the above, the large pulley disassembly device and its multi-specification adaptable structure provided in this application achieve stable clamping and uniform force application through the large-area clamping structure of the first clamping plate and the second clamping plate, combined with the pushing action of the hydraulic jack. This solves the problems of insufficient clamping force and easy damage to components in traditional disassembly devices. By installing and cooperating the first clamping plate with second clamping plates of different specifications, the problem of poor adaptability of traditional disassembly devices is solved. It has the advantages of improving clamping force and stability, adapting to pulleys of different specifications, reducing deformation risk, and improving safety and disassembly efficiency. Attached Figure Description

[0007] Figure 1 This is a diagram showing the usage state of the present invention when disassembling a larger-sized pulley; Figure 2 This is a diagram showing the usage state of the present invention when disassembling a smaller-sized pulley; Figure 3 for Figure 1 Left view of the first clamping plate in the middle; Figure 4 for Figure 1 Right view of the first clamping plate in the middle; Figure 5 for Figure 1 Left view of the second clamping plate in the middle; Figure 6 for Figure 2 Left view of the second clamping plate in the middle.

[0008] Among them, 1 is the base plate, 2 is the first clamping plate, 3 is the second clamping plate, 4 is the accommodating space, 5 is the fixing rod, 6 is the clamping and fixing space, 7 is the through hole, 8 is the mounting hole, 9 is the arc-shaped component, 10 is the connecting hole, 11 is the screw, 12 is the hydraulic jack, 13 is the drive shaft, and 14 is the pulley. Detailed Implementation

[0009] like Figure 1-6The large pulley disassembly device shown includes a base plate 1, a first clamping plate 2, and a second clamping plate 3. A receiving space 4 is formed between the base plate 1 and the first clamping plate 2, and the two are fixedly connected by a fixing rod 5. A clamping and fixing space 6 is formed between the first clamping plate 2 and the second clamping plate 3. A through hole 7 is provided in the center of the first clamping plate 2, and mounting holes 8 are arranged in a ring around the through hole 7. The second clamping plate 3 is a ring structure formed by the mating of at least two arc-shaped components 9. A connecting hole 10 is provided on the second clamping plate 3, which corresponds one-to-one with the mounting holes 8. The mounting holes 8 and the connecting holes 10 are connected by a screw 11 with a nut. A hydraulic jack 12 is provided in the receiving space 4. The base of the hydraulic jack 12 is fixedly installed on the base plate 1, and the piston rod of the hydraulic jack 12 can extend and retract through the through hole 7.

[0010] Among them, the base plate 1 refers to the basic component that bears the main load, and can be made of steel plate; the first clamping plate 2 refers to the fixing component with positioning function, and can be made of ring casting, with the diameter of the through hole 7 on it determined according to the size of the hydraulic rod of the hydraulic jack 12; the arc-shaped component 9 of the second clamping plate 3 refers to the combined clamping unit, and can be made of 2-4 arc-shaped steel plates, with an anti-slip rubber layer on the inner surface; the correspondence between the mounting hole 8 and the connecting hole 10 refers to the fastening structure with matching positions, and can be made of an array of bolt holes distributed at equal angles, with the hole spacing set according to the size of the pulley; the fixing method of the hydraulic jack 12 refers to the installation structure to prevent displacement, and can be made of welded fixing seat with positioning pin to ensure that the lifting axis coincides with the center of the through hole 7.

[0011] When using the above-mentioned disassembly device to pull and disassemble the large pulley 14, first insert one end of the screw 11 into the mounting hole 8 and install the nut to complete the installation of the screw 11 on the first clamping plate 2; place the first clamping plate 2 on one end face of the pulley, and then place the arc-shaped components 9 one by one on the other end face of the pulley 14, insert the other end of the screw 11 into the corresponding connecting hole 10 and install the nut to complete the installation of the screw 11 on the second clamping plate 3; at this time, the pulley 14 to be disassembled is located in the clamping and fixing space 6. Adjust the position of this device so that the pulley 1 Align the drive shaft 13 of 4 with the through hole 7, and tighten the nuts at both ends of the screw 11 so that the pulley 14 is tightly clamped between the first clamping plate 2 and the second clamping plate 3. After the hydraulic jack 12 is activated, the piston rod pushes against the end of the drive shaft 13 to generate a reverse force, causing the entire clamping device to move axially. At this time, the second clamping plate 3 and the hub of the pulley 14 form a surface contact, and the tension is evenly transmitted through multiple ring-distributed connection points to avoid local stress concentration. As the hydraulic pressure continues to increase, the pulley 14 smoothly disengages from the drive shaft axially, and no rotational torque is generated in the whole process.

[0012] like Figure 1-6As shown, this disassembly device further proposes that the first clamping plate 2 has two concentric but distributed mounting holes 8 on different pitch circles, and each mounting hole 8 on each pitch circle corresponds to a second clamping plate 3, and the connecting hole 10 on each second clamping plate 3 corresponds one-to-one with the mounting hole 8 on its corresponding pitch circle.

[0013] The pitch circle refers to a circle with different diameters centered on the through hole 7. Each pitch circle corresponds to a second clamping plate 3 of different sizes. This can be achieved by machining concentric annular grooves on the surface of the first clamping plate 2 or by laser marking circumferential lines of different diameters, allowing the device to adapt to pulleys of various sizes. The one-to-one correspondence between the connecting hole 10 and the mounting hole 8 means that the position and number of each connecting hole 10 perfectly match the mounting hole 8 on its corresponding pitch circle. This can be achieved by machining the hole positions according to preset coordinates using a CNC machine tool. This feature ensures that second clamping plates 3 of different sizes can only be installed at their corresponding pitch circle positions, preventing misalignment that could lead to clamping failure.

[0014] Specifically, when disassembling pulleys 14 of different diameters, the operator can select a pitch circle that matches the hub size of the pulley 14 and fix the corresponding second clamping plate 3 onto the mounting hole 8 of that pitch circle using screws 11. Since each pitch circle corresponds independently to a second clamping plate 3, clamping plates of different sizes will not interfere with each other. For example, when disassembling a pulley 14 with a larger diameter, such as... Figure 1 , 4 As shown in Figure 5, the corresponding wide second clamping plate 3 is installed at the outer pitch circle. When disassembling the smaller pulley 14, as... Figure 2 , 4 As shown in Figure 6, the second clamping plate 3 with the corresponding narrow width is installed on the inner pitch circle; thus completing the disassembly of pulleys of different specifications.

Claims

1. A disassembly device for a large pulley, characterized in that: It includes a base plate (1), a first clamping plate (2), and a second clamping plate (3); the base plate (1) and the first clamping plate (2) form an accommodating space (4), and the two are fixedly connected by a fixing rod (5); a clamping and fixing space (6) is formed between the first clamping plate (2) and the second clamping plate (3); a through hole (7) is provided in the center of the first clamping plate (2), and mounting holes (8) are arranged in a ring around the through hole (7) on the first clamping plate (2), and the second clamping plate (3) is formed by... The ring structure is formed by two arc-shaped components (9) joined together. The second clamping plate (3) is provided with connecting holes (10) that correspond one-to-one with the mounting holes (8). The mounting holes (8) and the connecting holes (10) are connected by a screw (11) with a nut. A hydraulic jack (12) is provided in the accommodating space (4). The base of the hydraulic jack (12) is fixedly installed on the base plate (1). The piston rod of the hydraulic jack (12) can extend and retract through the through hole (7).

2. The disassembly device for a large pulley as described in claim 1, characterized in that: The first clamping plate (2) has at least two mounting holes (8) on different pitch circles, which are concentric. Each mounting hole (8) on the pitch circle corresponds to a second clamping plate (3), and the connecting hole (10) on each second clamping plate (3) corresponds one-to-one with the mounting hole (8) on its corresponding pitch circle.

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