Motor train unit side door lower swing arm roller replacing device

Abstract

The utility model discloses a motor train unit side door lower swing arm roller replacing device which comprises a connecting sleeve, a first connecting block and a second connecting block, the connecting sleeve is arranged to be of a cylindrical barrel-shaped structure, the first connecting block and the second connecting block are arranged at the two ends of the connecting sleeve respectively, a connecting groove is formed in the first connecting block, and the second connecting block is arranged in the connecting groove. A connecting hole is formed in the second connecting block, the connecting sleeve and the connecting hole are coaxially arranged, and the extension line of the connecting groove perpendicularly intersects with the axis of the connecting sleeve; through the arrangement of the connecting sleeve, the connecting groove and the connecting hole, the rolling shaft of the lower swing arm roller of the door is connected with the connecting groove in a matched mode, the wrench is connected with the connecting hole in a matched mode, the axis of the rolling shaft is consistent with the connecting sleeve, and therefore the lower swing arm roller of the door is disassembled through the wrench. The connecting grooves are matched with the corresponding rolling shafts, so that different conventional wrenches can be used for disassembly, and meanwhile, conventional wrenches with different lengths can be replaced based on actual conditions to adjust the torque so as to ensure effective disassembly.

Description

Technical Field

[0001] The utility model relates to the technical field of refueling devices, in particular to a device for replacing a roller of a lower swing arm of a side door of an EMU. Background Art

[0002] Through on-site investigation, it was found that the lower swing arm rollers of the EMU side doors currently installed in the EMU depot have also shown varying degrees of wear, uneven wear, deformation, and cracking as the EMUs have been in use for years, which can easily lead to abnormal shaking, abnormal noises and even affect driving safety.

[0003] When workers inspect the warehouse and discover uneven wear, they need to replace the rollers on the side door lower arm. During the roller replacement process, they discovered that the side door lower arm is a one-piece cast structure, making it difficult to replace on an existing vehicle. The entire lower arm must be disassembled and secured to the ground before replacement. Currently available disassembly and assembly tools are commonly available, consisting of open-end and hexagonal wrenches, neither of which properly fits the roller shaft. Furthermore, conventional disassembly tools use a fixed length, resulting in a fixed torque. Insufficient torque can easily cause thread slippage, consuming time and effort, and inefficiently.

[0004] In view of the above-mentioned defects, the inventors of the present invention finally obtained the present invention after a long period of research and practice. Utility Model Content

[0005] In order to solve the above-mentioned technical defects, the technical solution adopted by the present invention is to provide a device for replacing the roller of the lower swing arm of the side door of an EMU, including a connecting sleeve, a first connecting block and a second connecting block. The connecting sleeve is arranged as a cylindrical tube structure, and the first connecting block and the second connecting block are respectively arranged at both ends of the connecting sleeve. The first connecting block is provided with a connecting groove, and the second connecting block is provided with a connecting hole. The connecting groove is arranged to correspond to the roller matching cross-section of the roller of the lower swing arm of the door, and the connecting hole is arranged to match the cross-section of the wrench head of the wrench. The connecting sleeve and the connecting hole are both coaxially arranged, and the extension line of the connecting groove intersects perpendicularly with the axis of the connecting sleeve.

[0006] Preferably, the connecting groove is a U-shaped groove, the groove width of the connecting groove matches the roller matching cross-section of the door lower swing arm roller, the cross-section of the connecting hole is set to a polygon, and the cross-sectional size of the connecting hole matches the cross-sectional size of the wrench head of the wrench.

[0007] Preferably, the first connecting block is configured as a circular plate-shaped piece, one end of the connecting groove is configured as an arc shape, and the other end is configured as a notch, and the end of the notch is configured to pass through the center of the first connecting block and continue to extend radially outward to the outer circular surface of the first connecting block.

[0008] Preferably, the diameter of the first connecting block is larger than the outer diameter of the connecting sleeve.

[0009] Preferably, the connecting sleeve is provided with a placement groove, which is provided on the outer circumferential surface of the connecting sleeve and communicates with the inside and outside of the connecting sleeve, and the opening of the placement groove is consistent with the opening of the connecting groove.

[0010] Preferably, the second connecting block is configured as a cylindrical structure, and the connecting hole is configured at the center of the second connecting block.

[0011] Preferably, the diameter of the second connecting block is smaller than the inner diameter of the connecting sleeve.

[0012] Preferably, the second connecting block is connected to the end of the connecting sleeve through a transition block, the second connecting block, the transition block and the connecting sleeve are coaxially arranged, the cross-section of the transition block is arranged to be circular, and the cross-sectional diameter of the transition block gradually increases in the extension direction from the second connecting block to the connecting sleeve.

[0013] Compared with the prior art, the beneficial effect of the present invention is that: the present invention arranges the connecting sleeve, the connecting groove and the connecting hole, matches and connects the roller of the door lower swing arm roller with the connecting groove, and matches and connects the wrench with the connecting hole, so that the roller axis of the door lower swing arm roller is consistent with the axis of the connecting sleeve, thereby realizing the disassembly of the door lower swing arm roller by the wrench, and the matching arrangement of the connecting groove and the corresponding roller can be used for disassembly using different conventional wrenches, and at the same time, conventional wrenches of different lengths can be replaced based on actual conditions to adjust the torque to ensure effective disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a three-dimensional structural view of the roller replacement device for the lower swing arm of the EMU side door;

[0015] Figure 2 This is a structural front view of the EMU side door lower swing arm roller replacement device;

[0016] Figure 3 This is a structural cross-sectional view of the roller replacement device for the lower swing arm of the EMU side door.

[0017] The numbers in the figure represent:

[0018] 1-connecting sleeve; 2-first connecting block; 3-second connecting block; 4-connecting groove; 5-connecting hole; 6-placement groove; 7-transition block. DETAILED DESCRIPTION

[0019] The above and other technical features and advantages of the present invention are described in more detail below with reference to the accompanying drawings.

[0020] Example 1

[0021] like Figure 1 、 Figure 2 and Figure 3 As shown, Figure 1 This is a three-dimensional structural view of the roller replacement device for the lower swing arm of the EMU side door; Figure 2 This is a structural front view of the EMU side door lower swing arm roller replacement device; Figure 3 This is a structural cross-sectional view of the roller replacement device for the lower swing arm of the EMU side door.

[0022] The device for replacing the lower swing arm roller of the side door of an EMU of the present invention includes a connecting sleeve 1, a first connecting block 2 and a second connecting block 3. The connecting sleeve 1 is configured as a cylindrical tube structure. The first connecting block 2 and the second connecting block 3 are respectively arranged at both ends of the connecting sleeve 1. A connecting groove 4 is provided on the first connecting block 2, and a connecting hole 5 is provided on the second connecting block 3. The connecting groove 4 is configured to correspond to the roller matching cross-section of the roller of the lower swing arm of the door, and the connecting hole 5 is configured to match the cross-section of the wrench head of the wrench. The connecting sleeve 1 and the connecting hole 5 are both coaxially configured, and the extension line of the connecting groove 4 intersects perpendicularly with the axis of the connecting sleeve 1.

[0023] The utility model arranges the connecting sleeve 1, the connecting groove 4 and the connecting hole 5, cooperates and connects the roller of the door lower swing arm roller with the connecting groove 4, and cooperates and connects the wrench with the connecting hole 5, so that the roller axis of the door lower swing arm roller is consistent with the connecting sleeve 1, thereby realizing the disassembly of the door lower swing arm roller by the wrench. The matching arrangement of the connecting groove 4 and the corresponding roller can be used for disassembly using different conventional wrenches. At the same time, conventional wrenches of different lengths can also be replaced based on actual conditions to adjust the torque to ensure effective disassembly.

[0024] Generally, the connecting groove 4 is a U-shaped groove, the groove width of the connecting groove 4 matches the roller matching cross-section of the door lower swing arm roller, the cross-section of the connecting hole 5 is set to a polygon, and the cross-sectional size of the connecting hole 5 matches the cross-sectional size of the wrench head of the wrench.

[0025] Preferably, the first connecting block 2 is configured as a circular plate-like member, one end of the connecting groove 4 is configured as an arc shape, and the other end is configured as a notch, and the end of the notch is configured to pass through the center of the first connecting block 2 and continue to extend radially outward to the outer circumferential surface of the first connecting block 2, thereby facilitating the placement of the roller through the notch into the connecting groove 4. The two sides of the notch can adopt arc transitions to facilitate the placement of the roller.

[0026] Preferably, the diameter of the first connecting block 2 is larger than the outer diameter of the connecting sleeve 1 , so that welds can be provided both inside and outside the connecting sleeve 1 to improve the connection strength between the first connecting block 2 and the connecting sleeve 1 .

[0027] A placement groove 6 is provided on the connecting sleeve 1. The placement groove 6 is provided on the outer circular surface of the connecting sleeve 1 and connects the inside and outside of the connecting sleeve 1. The opening of the placement groove 6 is consistent with the opening of the connecting groove 4, so that it is convenient to put the connecting sleeve 1 on the outside of the door lower swing arm roller to avoid damaging the roller.

[0028] Preferably, the second connecting block 3 is set to a cylindrical structure, and the connecting hole 5 is set at the center of the second connecting block 3. Setting the second connecting block 3 with a certain thickness is more conducive to increasing the length of the wrench head inserted into the connecting hole 5, thereby achieving a better connection state.

[0029] Generally, since the door lower arm roller needs to be placed inside the connecting sleeve 1, in order to reduce the overall weight, the size of the second connecting block 3 should be relatively small based on the size of the connecting hole 5, so the diameter of the second connecting block 3 is smaller than the inner diameter of the connecting sleeve 1.

[0030] The second connecting block 3 is connected to the end of the connecting sleeve 1 via a transition block 7. The second connecting block 3, the transition block 7, and the connecting sleeve 1 are coaxially arranged. The cross-section of the transition block 7 is circular, and the cross-sectional diameter of the transition block 7 gradually increases in the direction of extension from the second connecting block 3 to the connecting sleeve 1, thereby forming a smooth transition and ensuring the connection strength between the second connecting block 3 and the connecting sleeve 1. The connecting hole 5 passes through the transition block 7 along the axis of the connecting sleeve 1.

[0031] Example 2

[0032] The present embodiment is the roller of the lower swing arm of the side door of the CRH6A EMU. The rollers involved are all of national standard size. In theory, they can be disassembled with an M5 hexagonal wrench or an M11 open-end wrench. In practice, when disassembling with an M5 hexagonal wrench or an M11 open-end wrench, due to their shorter size, the torque provided is insufficient, which often easily causes slipping. The use of the utility model allows the use of a longer-sized wrench for disassembly and installation, thereby extending the wrench size and reducing the torque to adapt to the size of the roller shaft and better exert force. The roller shaft was measured, and the matching surface of the roller shaft was a hexagonal prism with a straight-line distance of 11 mm. The width of the connecting groove 4 described in this embodiment is set to 11 mm. This embodiment can better fit the roller shaft, and the hardness meets the requirements while changing the force mode. Combined with the sleeve, it can better cooperate with the rotation force, thereby improving the efficiency of disassembly and installation.

[0033] The above description is merely a preferred embodiment of the present invention and is intended to be illustrative rather than restrictive of the present invention. Those skilled in the art will appreciate that many changes, modifications, and even equivalents may be made to the present invention within the spirit and scope of the claims, and all of these changes will fall within the scope of protection of the present invention.

Claims

1. A device for replacing the roller of the lower swing arm of the side door of an EMU, characterized in that: It includes a connecting sleeve, a first connecting block and a second connecting block, the connecting sleeve is arranged as a cylindrical tube structure, the first connecting block and the second connecting block are respectively arranged at both ends of the connecting sleeve, the first connecting block is provided with a connecting groove, and the second connecting block is provided with a connecting hole, the connecting groove is arranged to correspond to the roller matching cross-section of the door lower swing arm roller, the connecting hole is arranged to match the cross-section of the wrench head of the wrench, the connecting sleeve and the connecting hole are both coaxially arranged, and the extension line of the connecting groove intersects perpendicularly with the axis of the connecting sleeve.

2. The device for replacing the roller of the lower swing arm of the EMU side door according to claim 1, characterized in that: The connecting groove is a U-shaped groove, the groove width of the connecting groove matches the roller matching cross-section of the door lower swing arm roller, the cross-section of the connecting hole is set to a polygon, and the cross-sectional size of the connecting hole matches the cross-sectional size of the wrench head of the wrench.

3. The device for replacing the roller of the lower swing arm of the EMU side door according to claim 2, characterized in that: The first connecting block is configured as a circular plate-shaped member, one end of the connecting groove is configured as an arc shape, and the other end is configured as a notch, and the end of the notch is configured to pass through the center of the first connecting block and continue to extend radially outward to the outer circular surface of the first connecting block.

4. The device for replacing the roller of the lower swing arm of the EMU side door according to claim 3, characterized in that: The diameter of the first connecting block is larger than the outer diameter of the connecting sleeve.

5. The roller replacement device for the lower swing arm of the EMU side door according to claim 3 is characterized in that: The connecting sleeve is provided with a placement groove, which is provided on the outer circumferential surface of the connecting sleeve and communicates with the inside and outside of the connecting sleeve. The opening of the placement groove is consistent with the opening of the connecting groove.

6. The device for replacing the roller of the lower swing arm of the EMU side door according to claim 5, characterized in that: The second connection block is configured as a cylindrical structure, and the connection hole is configured at the center of the second connection block.

7. The device for replacing the roller of the lower swing arm of the EMU side door according to claim 6, characterized in that: The diameter of the second connecting block is smaller than the inner diameter of the connecting sleeve.

8. The device for replacing the roller of the lower swing arm of the EMU side door according to claim 7, characterized in that: The second connecting block is connected to the end of the connecting sleeve through a transition block. The second connecting block, the transition block and the connecting sleeve are coaxially arranged. The cross-section of the transition block is set to be circular, and the cross-sectional diameter of the transition block gradually increases in the extending direction from the second connecting block to the connecting sleeve.

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