Chain puller

Abstract

The utility model relates to a chain puller, and relates to the technical field of dismounting tools. The chain puller comprises a guide rod, a lantern ring, a chain, a connecting piece and a connecting bolt. During use, the connecting bolt is in threaded connection with a threaded hole of a to-be-disassembled component, the lantern ring is moved, so that the chain connected with the lantern ring is tightened and drives the connecting piece and the connecting bolt to move, and the to-be-disassembled component mounted on the shaft is disassembled. The dismounting tool can be suitable for dismounting work of parts without high-strength outer edges, and damage to the dismounted parts in the dismounting process is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of disassembly and assembly tools, in particular to a chain puller. Background Art

[0002] The locomotive screw air compressor is the source of compressed air for locomotives and trains. In order to ensure the safe operation of locomotives and trains, it is necessary to ensure the normal operation of the screw air compressor. A cooling fan is often installed on the air compressor to reduce the temperature of the air compressor during operation.

[0003] When repairing a locomotive screw air compressor, it is necessary to remove the cooling fan from the air compressor. The cooling fan is generally installed on the main shaft of the air compressor. In the related art, a series of pullers have been developed to save effort in removing related components from the main shaft. Among them, patent CN219617663U discloses a special disassembly tool for a vertical bearing seat, which adjusts the traditional rod-shaped pull claw to a chain-connected pull claw, which can adapt to the disassembly of bearing seats of different diameters. Some personnel also use this type of chain puller to disassemble the cooling fan.

[0004] However, conventional pullers all use claw-like structures to hook the fan or other parts to be removed on the shaft. However, many parts to be removed do not have protruding outer edges for the claws to hook. For example, the cooling fan installed in the air compressor has fan blades on the outside, which are difficult for the claws to hook. Moreover, the outside of the cooling fan is thin, so even if the claws hook the outside of the cooling fan, the cooling fan will be damaged during the process of disassembling the cooling fan. Utility Model Content

[0005] The utility model provides a chain puller which is used for disassembling components installed on a shaft and reduces damage to the disassembled components.

[0006] The utility model provides a chain puller, comprising: a guide rod; a collar, which is installed on the guide rod and can move along the axis of the top guide rod, and at least two chains are connected to the collar; a connecting piece, which is installed at one end of the chain away from the collar, and the connecting piece is provided with a mounting hole; and a connecting bolt for threaded connection with a part to be disassembled, the connecting bolt is inserted into the mounting hole, and is detachably mounted on the connecting piece through a locking nut.

[0007] In one embodiment, the chain puller further comprises: a driving member connected to the collar or the guide rod to drive the collar to move along the axis of the guide rod.

[0008] In one embodiment, the collar is connected with at least three chains, and the chains are evenly spaced apart along the circumference of the collar.

[0009] In one embodiment, the lengths of the individual chains are equal.

[0010] In one embodiment, the connecting member is symmetrical along the central axis of the mounting hole.

[0011] In one embodiment, the chain includes a plurality of chain links that are rotatably connected in sequence, the chain links include pins, the connecting piece is a closed ring structure, and the connecting piece is sleeved outside the pin of the chain end link, and the connecting piece can rotate around the pin.

[0012] In one embodiment, the connecting member includes a first connecting portion, the first connecting portion includes a mounting ring, and the mounting ring surrounds a mounting hole.

[0013] In one embodiment, the connecting member also includes a second connecting portion connected end to end with the first connecting portion, the second connecting portion includes an arc segment and straight line segments arranged at both ends of the arc segment, wherein the straight line segment is smoothly connected to the arc segment, and the radius of the arc segment is greater than the radius of the pin shaft.

[0014] In one embodiment, the bolt head of the connecting bolt and the locking nut are located on opposite sides of the first connecting portion.

[0015] In one embodiment, the guide rod includes a tip disposed at an end thereof.

[0016] Compared with the prior art, the utility model has the advantage that the connecting bolts are threadedly connected to the parts to be disassembled, so that the stress during the disassembly process is concentrated at the threaded holes of the parts to be disassembled, and the structure where the threaded holes are opened is generally thicker, and the probability of damage during the disassembly process is much lower than that of hooking at the thinner outer edge, thereby reducing the damage to the parts to be disassembled during disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0018] Figure 1 It is a schematic diagram of the main structure of the chain puller in the embodiment of the utility model;

[0019] Figure 2 It is a partial enlarged structural schematic diagram of the connection between the connecting member and the chain in the embodiment of the utility model;

[0020] Figure 3 It is a schematic diagram of the main structure of the heat dissipation fan to be removed in the embodiment of the utility model.

[0021] Reference numerals:

[0022] 1. Guide rod; 11. Top;

[0023] 2. Ring;

[0024] 3. Chain; 31. Pin;

[0025] 4. Connecting piece; 41. First connecting part; 42. Second connecting part;

[0026] 5. Connecting bolt; 51. Bolt head; 52. Bolt shank;

[0027] 6. Lock nut;

[0028] 7. driving member; 71. driving handle;

[0029] 8. Cooling fan; 81. Threaded hole; 82. Fan blade. DETAILED DESCRIPTION

[0030] The utility model will be further described below in conjunction with the accompanying drawings.

[0031] like Figure 3 As shown, a cooling fan 8 for a compressor has blades 82 arranged at the outer edge of the cooling fan 8. If a puller with a hook structure is used to disassemble the cooling fan 8, the pull claw of the puller needs to be hooked at the outer edge of the cooling fan 8. However, in order to achieve a better cooling effect, the outer edge of the cooling fan 8 adopts a hollow design and is installed with a plurality of blades 82 spaced apart from each other, and the strength of the outer edge is relatively low. During the disassembly process using the pull claw hook, the outer edge of the cooling fan 8 will be deformed or even broken, and the fan cannot be used again after disassembly.

[0032] like Figure 1 As shown, in order to reduce the damage to the cooling fan 8 during the disassembly process, an embodiment of the utility model provides a chain puller, which includes a guide rod 1, a ring 2 is installed on the guide rod 1, the ring 2 is connected to the chain 3, a connecting member 4 is installed at one end of the chain 3 away from the ring 2, and the connecting member 4 is detachably installed with a connecting bolt 5.

[0033] When in use, a connecting bolt 5 matching the threaded hole 81 of the cooling fan 8 can be selected, the connecting bolt 5 can be inserted into the mounting hole of the connector 4, and then the connecting bolt 5 can be locked on the connector 4 by the locking nut 6. The connecting bolt 5 is threadedly connected to the threaded hole 81 of the part to be disassembled, so as to achieve the locking of the chain puller and the part to be disassembled. The end of the guide rod 1 is held against the shaft on which the part to be disassembled is installed, and the collar 2 is moved along the guide rod 1 to drive the chain 3 to axially move the part to be disassembled, thereby completing the disassembly of the part to be disassembled.

[0034] For threaded holes 81 of different specifications, matching can be achieved by replacing the connecting bolts 5 on the connecting member 4 .

[0035] Compared with hooking on the outside of the part to be disassembled, the threaded connection has a higher connection strength, avoiding the risk of the claw being separated from the part to be disassembled during the disassembly process. In addition, the structure where the threaded hole 81 is provided has a certain thickness and can withstand a large pulling force, avoiding hooking on the weak part of the part to be disassembled during disassembly, causing damage to the part to be disassembled.

[0036] Some parts to be disassembled are originally provided with threaded holes 81, such as the end cover for bearing installation, which is generally provided with threaded holes 81 for installation on the housing of the device. During the disassembly process, the bolts on the end cover can be removed, and then the connecting bolts 5 of the chain puller are threadedly connected to the end cover, and the chain puller is used to separate the end cover from the bearing in the middle.

[0037] That is to say, the chain puller provided in the present application can be used not only to disassemble the cooling fan 8, but also to disassemble the bearing end cover having the threaded hole 81. The end cover which is difficult to hook with the claws because it is embedded in the housing can be disassembled.

[0038] The collar 2 is connected with at least two chains 3, and each chain 3 is connected with a connector 4. When the part to be disassembled is pulled, at least two stress points can be formed on the part to be disassembled, so as to avoid the tension being concentrated in one threaded hole 81 and reduce the damage to the threaded hole 81 during the disassembly process.

[0039] like Figure 1 As shown, in some implementations, the chain puller further includes a driving member 7, which is connected to the collar 2 or the guide rod 1 to drive the collar 2 to move axially along the guide rod 1. In the present application, the driving member 7 is a hydraulic cylinder, and the driving member 7 includes a driving handle 71, which can drive the collar 2 to move axially by reciprocatingly pressing the driving handle 71. Compared with manually moving the collar 2, the workload during disassembly is reduced.

[0040] In this embodiment, the guide rod 1 is provided with an external thread, and the collar 2 is provided with an internal thread, and the collar 2 is threadedly connected to the guide rod 1. The driving member 7 is connected to the guide rod 1 to drive the guide rod 1 to rotate, and then drive the collar 2 to move along the axis of the guide rod 1.

[0041] In other embodiments, the driving member 7 may be a linear cylinder such as an electric telescopic cylinder, which is directly connected to the collar 2 to drive the collar 2 to move linearly along the guide rod 1 .

[0042] like Figure 1 and Figure 3As shown, in some implementations, the collar 2 is connected to at least three chains 3, and the chains 3 are evenly spaced along the circumference of the collar 2. When disassembling the parts to be disassembled, the three connecting bolts 5 can be threadedly connected to the parts to be disassembled, thereby improving the connection strength between the chain puller and the parts to be disassembled, and disassembling the parts to be disassembled more stably. By arranging the chains 3 evenly spaced along the circumference, uneven force on the parts to be disassembled during the disassembly process can be avoided, and the deviation of the moving direction relative to the axis due to uneven force can be avoided, making the disassembly process smoother.

[0043] The number of the collars 2 connecting the chains 3 can be set to be equal to the number of the threaded holes 81 set on the parts to be disassembled.

[0044] like Figure 1 As shown, in some implementations, the lengths of the chains 3 are equal, so as to avoid the situation where part of the chains 3 are tight and the other part of the chains 3 are loose during the movement of the ring 2.

[0045] In some implementations, a winding device may be provided on the collar 2, and the chain 3 may be wound around the winding device. By winding and rotating the winding device, the length of each chain 3 may be adjusted, so that when the components to be disassembled are disassembled, the length of each chain 3 may be kept consistent. The specific winding device includes a reel rotatably mounted on the outer periphery of the collar 2, and a driving motor driving the reel to rotate. One end of the chain 3 away from the connecting member 4 is wound around the reel, and the reeling amount of the reel is controlled by the driving motor to adjust the effective length of the chain 3.

[0046] like Figure 1 and Figure 2 As shown, in some implementations, the connector 4 is symmetrical along the central axis of the mounting hole. By setting the connector 4 to be symmetrical along the central axis of the mounting hole, the strength of the connector 4 on both sides of the mounting hole is substantially equal, thereby avoiding the situation where the connector 4 is locally deformed due to the large difference in strength on both sides of the mounting hole.

[0047] In the present application, the connecting member 4 is an annular structure. In other implementations, the connecting member 4 may also be a block or plate structure, as long as a mounting hole for installing the connecting bolt 5 is provided.

[0048] like Figure 1 As shown, in some implementations, the chain 3 includes a plurality of chain links that are rotatably connected in sequence, the chain links include a pin 31, the connector 4 is a closed ring structure, and the connector 4 is sleeved outside the pin 31 of the end link of the chain 3, and the connector 4 can rotate around the pin 31. By sleeved the connector 4 outside the pin 31, the installation angle of the connector 4 can be conveniently adjusted.

[0049] Since the chain 3 itself has multiple sections of rotatably connected links, it can be flexibly deformed so as to be used in complex environments.

[0050] like Figure 1 and Figure 2 As shown, in some implementations, the connecting member 4 includes a first connecting portion 41, the first connecting portion 41 includes a mounting ring, and the mounting ring forms a mounting hole. That is, the connecting bolt 5 is inserted into the mounting hole formed by the mounting ring to achieve the connection between the connecting bolt 5 and the connecting member 4.

[0051] In some implementations, the first connection portion 41 further includes extension segments disposed on opposite sides of the mounting ring, the extension segments extending radially along the mounting hole, and the extension pairs are symmetrical along the axis of the mounting hole. One end of the extension segment away from the mounting ring is connected to the second connection portion 42 of the connector 4, so that the second connection portion 42 is a closed ring structure.

[0052] In some implementations, the connector 4 further includes a second connector 42 connected end to end with the first connector 41, and the second connector 42 includes an arc segment and straight segments provided at both ends of the arc segment, wherein the straight segment is smoothly connected to the arc segment, and the radius of the arc segment is greater than the radius of the pin 31. During the disassembly process, the first connector 41 of the connector 4 is connected to the connecting bolt 5, and the second connector 42 of the connector 4 is connected to the chain 3. Under the tension of the pulling force, the second connector 42 is tightly attached to the pin 31, and the pin 31 will smoothly move along the inner side of the second connector 42 to the arc segment of the second connector 42. By bending the arc segment, the pin 31 can be prevented from being suddenly offset during the tensioning process.

[0053] like Figure 1 as well as Figure 2 As shown, in some implementations, the bolt head 51 of the connecting bolt 5 and the locking nut 6 are located on opposite sides of the first connecting portion 41. After the connecting bolt 5 is inserted into the mounting hole of the connecting member 4, the locking nut 6 is threadedly connected to the bolt rod 52 of the connecting bolt 5, so that the bolt head 51 of the connecting bolt 5 and the locking nut 6 are located on opposite sides of the first connecting portion 41.

[0054] like Figure 1 As shown, in some implementations, the guide rod 1 includes a tip 11 disposed at its end. When in use, the tip 11 is abutted against the end of the main shaft of the compressor, and then the connecting bolt 5 is threadedly connected to the part to be disassembled. Then, the driving member 7 drives the collar 2 to move along the axis of the guide rod 1 to achieve the removal of the part to be disassembled.

[0055] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A chain puller, characterized in that: It includes: Guide rod; A collar, which is mounted on the guide rod and can move along the axis of the top guide rod, and at least two chains are connected to the collar; A connecting piece, which is installed at one end of the chain away from the collar, and the connecting piece is provided with a mounting hole; and A connecting bolt for threaded connection with a component to be disassembled, wherein the connecting bolt is inserted into the mounting hole and is detachably mounted on the connecting piece via a locking nut.

2. The chain puller according to claim 1, characterized in that: The chain puller also includes: A driving member is connected to the collar or the guide rod to drive the collar to move along the axis of the guide rod.

3. The chain puller according to claim 1 or 2, characterized in that: The collar is connected with at least three chains, and the chains are evenly spaced and arranged along the circumference of the collar.

4. The chain puller according to claim 1 or 2, characterized in that: The lengths of the chains are equal.

5. The chain puller according to claim 1 or 2, characterized in that: The connecting piece is symmetrical along the central axis of the mounting hole.

6. The chain puller according to claim 1 or 2, characterized in that: The chain comprises a plurality of chain links which are connected in rotation in sequence, the chain links comprise pins, the connecting piece is in a closed annular structure, and the connecting piece is sleeved outside the pin of the chain end link, and the connecting piece can rotate around the pin.

7. The chain puller according to claim 6, characterized in that: The connecting member includes a first connecting portion, the first connecting portion includes a mounting ring, and the mounting ring surrounds the mounting hole.

8. The chain puller according to claim 7, characterized in that: The connecting member also includes a second connecting portion connected end to end with the first connecting portion, the second connecting portion includes an arc segment and straight line segments arranged at both ends of the arc segment, wherein the straight line segment is smoothly connected to the arc segment, and the radius of the arc segment is greater than the radius of the pin shaft.

9. The chain puller according to claim 7, characterized in that: The bolt head of the connecting bolt and the locking nut are located on opposite sides of the first connecting portion.

10. The chain puller according to claim 1, characterized in that: The guide rod includes a tip disposed at an end thereof.

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