A motor train unit bogie traction center pin connection auxiliary device and a connection method

Abstract

The application provides a motor train unit bogie traction center pin connection auxiliary device, which comprises a support foot, a mounting plate, a shaft coupling, two elevators, two lifting lead screws, two flat head support joints, a center pin support base and a center pin guide pressing plate; the mounting plate is installed on the top of the support foot; the shaft coupling is arranged at the center of the surface of the mounting plate; the two elevators are symmetrically installed on the surface of the mounting plate and located at the two ends of the shaft coupling; and the two lifting lead screws are arranged in the two elevators respectively. The motor train unit bogie traction center pin connection auxiliary device provided by the application is provided with electric and manual double adjustment modes, can automatically adjust the external joint to be compatible with multiple specifications of electric wrenches, can realize rapid lifting of the lifting platform, and can realize micro-precision adjustment of the height adjustment handle, thereby replacing the traditional manual lifting and prying operation, greatly reducing the physical consumption of the operator, and improving the operation efficiency.

Description

Technical Field

[0001] This invention relates to the field of railway vehicle equipment, and more particularly to an auxiliary device for connecting the traction center pin of a high-speed train bogie. Background Technology

[0002] As the core equipment of high-speed railway transportation, the performance of the EMU directly affects the safety and efficiency of train operation. The bogie center pin, as the core component connecting the car body and the bogie, determines the stability, safety and ride comfort of the train operation through its installation accuracy.

[0003] Currently, the installation of the traction center pin of a certain type of EMU bogie is being carried out in the trench of the static pressure test bench. The working space is small and low, and there is no special mechanical tooling to assist in the operation. The entire connection work is completed by manpower and simple tools. This not only results in low work efficiency but also poses many safety hazards: When installing the center pin square key, one person needs to use a lever to support the "Z"-shaped traction rod, and another person needs to use a copper rod to hammer in the square key. The square key is prone to loosening. When pre-tightening the center pin bolt, one person operates the tool to pre-tighten, and another person needs to hold the center pin pressure plate for a long time. The workers are prone to mechanical crush injuries to their hands and heads due to the square key loosening or slipping. In particular, in the motor hanger area of ​​the power bogie, the pressure plate falling off can easily cause personal injury to the hands. At the same time, the manual operation consumes a lot of physical strength, and the complicated operation steps also increase the maintenance cost of the EMU.

[0004] Therefore, it is necessary to provide an auxiliary device for connecting the traction center pin of a train bogie to solve the above-mentioned technical problems. Summary of the Invention

[0005] This invention provides an auxiliary device for connecting the traction center pin of a high-speed train bogie, which solves the problems of harsh working environment, lack of mechanical assistance, high difficulty, high safety risk, low efficiency and high maintenance cost in the existing installation of the traction center pin of the high-speed train bogie.

[0006] To solve the above-mentioned technical problems, the present invention provides an auxiliary device for connecting the traction center pin of a high-speed train bogie, comprising:

[0007] Support legs, mounting plate, coupling, two lifting platforms, two lifting screws, two flat-head support joints, center pin support base and center pin guide plate;

[0008] The mounting plate is installed on the top of the support frame;

[0009] The coupling is located at the center of the mounting plate surface;

[0010] The two lifting platforms are symmetrically installed on the surface of the mounting plate and located at both ends of the coupling;

[0011] The two lifting screws are respectively installed inside the two lifting machines;

[0012] The two flat-headed support joints are respectively connected to the top ends of the two lifting screws;

[0013] The central pin support base is connected between the two flat-head support joints;

[0014] The center pin guide plate is installed on the surface of the center pin support base.

[0015] Preferably, a conical connecting hole for the center pin is provided at the center position of the center pin guide plate.

[0016] Preferably, the two ends of the coupling are respectively connected to an adjusting wheel and an automatic adjusting external connector.

[0017] Preferably, the surface of the adjusting wheel is connected to a height adjusting handle, and a mounting base is installed on one side of each of the two elevators.

[0018] Preferably, a bracket is provided between the two lifting screws, and a housing is mounted on the surface of the bracket.

[0019] Preferably, a conveying device is provided on the surface of the bracket and on one side of the housing. The conveying device includes a conveying pump, two first conveying pipes, a T-joint, and two second conveying pipes. The conveying pump is installed on the surface of the bracket. The two first conveying pipes are respectively connected to the input end and the output end of the conveying pump. The T-joint is connected to one end of one of the first conveying pipes, and the two second conveying pipes are respectively connected to the two ends of the T-joint.

[0020] Preferably, one end of each of the two second delivery pipes is connected to a liquid outlet.

[0021] Preferably, the surfaces of the two lifting screws are provided with a coating component, the coating component including a fixing ring and a coating cotton, the fixing ring being sleeved on the surface of the lifting screw, and the coating cotton being disposed inside the fixing ring.

[0022] Preferably, a plurality of disassembly components are provided between the support leg and the mounting plate. Each disassembly component includes a disassembly groove, a disassembly block, and a bolt. The disassembly groove is opened at the top of the support leg, the disassembly block is disposed inside the disassembly groove, and the bolt is disposed between the disassembly block and the support leg.

[0023] A connection method for an auxiliary device for connecting the traction center pin of a bogie in a high-speed train includes the following steps:

[0024] S1. Device Deployment and Preliminary Verification: Place the auxiliary device precisely at the preset assembly station below the bogie traction beam, align the positioning reference surface of the center pin guide plate with the assembly mark on the lower surface of the traction beam, check the tightness of the connections of each component of the device, connect the automatic adjustment external connector with the calibrated electric wrench, and verify that the lifting function of the lifting screw is normal.

[0025] S2. Traction beam support and square key installation: Start the electric wrench to drive the lifting screw to rise, so that the center pin guide plate slowly fits the lower part of the traction beam. Rotate the height adjustment handle to complete the fine adjustment and locking of the horizontal posture of the traction beam. Use a special copper tool to smoothly knock the square key into the groove along the axis of the center pin square key alignment groove to ensure that the fit clearance meets the standard and there is no jamming or loosening.

[0026] S3. Precise alignment of the center pin: The lifting screw is driven in reverse by an electric wrench, so that the center pin guide plate is lowered to maintain a safe distance of ≥200mm from the traction beam. The auxiliary device is moved along the axis of the traction beam, and the guiding effect of the tapered connecting hole of the center pin on the center pin guide plate is used to make the center pin and the bolt hole of the traction beam coaxially and precisely aligned.

[0027] S4. Bolt Assembly and Tightening Finishing: Install the 55-type sleeve, center pin bolt, three-layer washer, and center pin pressure plate into the center pin tapered connection hole in sequence. Drive the lifting screw to align the front end of the center pin bolt with the center pin thread hole inlet. Replace the ratchet wrench to complete the bolt pre-tightening. Simultaneously rotate the height adjustment handle to fine-tune the pressure plate height so that the pressure plate is completely in contact with the upper surface of the center pin. Use a calibrated torque wrench to complete the final bolt tightening at the rated torque of 1100 N·m. Finally, drive the lifting screw to descend and disengage the guide pressure plate from the traction beam. Disconnect the device from the electric wrench to complete all connection operations of the center pin.

[0028] Compared with related technologies, the auxiliary device for connecting the traction center pin of a high-speed train bogie provided by the present invention has the following advantages:

[0029] This invention provides an auxiliary device for connecting the traction center pin of a high-speed train bogie. The device is equipped with electric and manual dual adjustment modes. The automatic adjustment external connector is compatible with multiple specifications of electric wrenches, which can realize the rapid lifting and lowering of the lifting platform. The height adjustment handle can achieve micro-precision adjustment, replacing the traditional manual lifting and prying operation, greatly reducing the physical exertion of the operator and improving the work efficiency.

[0030] The tapered connecting hole of the center pin guide plate enables precise alignment between the center pin and the bolt hole of the traction beam, avoiding errors caused by manual alignment and ensuring assembly accuracy. At the same time, during the installation of the square key and the pre-tightening of the bolts, there is no need for manual contact with dangerous parts, completely avoiding the risk of personal injury from mechanical crushing and improving operational safety. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the first embodiment of an auxiliary device for connecting the traction center pin of a high-speed train bogie provided by the present invention;

[0032] Figure 2 for Figure 1 The front view of the connecting auxiliary device shown;

[0033] Figure 3 This is a schematic diagram of the second embodiment of the auxiliary device for connecting the traction center pin of a high-speed train bogie provided by the present invention;

[0034] Figure 4 for Figure 3 The enlarged schematic diagram of part A shown below;

[0035] Figure 5 for Figure 3 The enlarged schematic diagram of section B is shown below;

[0036] Figure 6 This is a schematic diagram of the third embodiment of the auxiliary device for connecting the traction center pin of a high-speed train bogie provided by the present invention;

[0037] Figure 7 for Figure 6 The enlarged schematic diagram of section C is shown.

[0038] The following are the labeling elements in the diagram: 1. Support leg; 2. Mounting plate; 3. Coupling; 4. Lifting mechanism; 5. Lifting screw; 6. Flat-head support connector; 7. Center pin support base; 8. Center pin guide plate; 9. Center pin tapered connection hole; 10. Adjusting wheel; 11. Height adjustment handle; 12. Automatic adjustment external connector; 13. Mounting base.

[0039] 14. Support frame; 15. Box body.

[0040] 16. Conveying device; 161. Conveying pump; 162. First conveying pipe; 163. T-joint; 164. Second conveying pipe.

[0041] 17. Dispensing head,

[0042] 18. Application component; 181. Retaining ring; 182. Application cotton.

[0043] 19. Disassembly component; 191. Disassembly slot; 192. Disassembly block; 193. Bolt. Detailed Implementation

[0044] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0045] First Embodiment

[0046] Please refer to the following: Figure 1 and Figure 2 ,in, Figure 1 This is a schematic diagram of the first embodiment of an auxiliary device for connecting the traction center pin of a high-speed train bogie provided by the present invention; Figure 2 for Figure 1 The diagram shows a front view of the connecting auxiliary device. A connecting auxiliary device for the traction center pin of a high-speed train bogie includes:

[0047] Support legs 1, mounting plate 2, coupling 3, two lifting platforms 4, two lifting screws 5, two flat-head support joints 6, center pin support base 7, and center pin guide plate 8;

[0048] The mounting plate 2 is installed on the top of the support leg 1;

[0049] The coupling 3 is located at the center of the surface of the mounting plate 2;

[0050] The two lifting platforms 4 are symmetrically installed on the surface of the mounting plate 2 and located at both ends of the coupling 3;

[0051] The two lifting screws 5 are respectively installed inside the two lifting machines 4;

[0052] The two flat-headed support joints 6 are respectively connected to the top ends of the two lifting screws 5;

[0053] The central pin support base 7 is connected between the two flat-head support joints 6;

[0054] The center pin guide plate 8 is installed on the surface of the center pin support base 7.

[0055] The center pin guide plate 8 has a center pin tapered connection hole 9 at its center.

[0056] The two ends of the coupling 3 are respectively connected to the adjusting wheel 10 and the automatic adjusting external connector 12.

[0057] The surface of the adjusting wheel 10 is connected to a height adjusting handle 11, and a mounting base 13 is installed on one side of each of the two lifting machines 4.

[0058] Mounting plate 2 provides a stable mounting support foundation for the upper components of the device; coupling 3, as the core component for power transmission and adjustment, has an adjusting wheel 10 and an automatic adjusting external connector 12 fixedly connected to its two ends respectively. A height adjustment handle 11 is welded and fixed to the surface of the adjusting wheel 10. Manual fine adjustment of the device can be achieved by rotating the height adjustment handle 11. The automatic adjusting external connector 12 can be adapted to multiple specifications of electric wrenches to realize the transmission of electric torque and angle compensation. Two lifting platforms 4 are symmetrically bolted to the surface of mounting plate 2 and located at the left and right ends of coupling 3. Mounting seats 13 are welded to one side of each of the two lifting platforms 4 to improve the stability of the installation of the lifting platforms 4.

[0059] Two lifting screws 5 are coaxially mounted inside the two lifting machines 4, respectively. They adopt a high-precision trapezoidal thread design to achieve precise vertical lifting. Two flat-head support joints 6 are detachably connected to the top of the two lifting screws 5, realizing a flexible connection between the lifting screws 5 and the center pin support base 7, ensuring the stability of the support. The center pin support base 7 is welded between the two flat-head support joints 6, providing an installation platform for the center pin guide plate 8. The center pin guide plate 8 is bolted to the surface of the center pin support base 7, and a center pin conical connecting hole 9 is opened at its center. This conical connecting hole 9 constitutes a conical connecting positioning mechanism, which can realize the coaxial alignment guidance between the center pin and the bolt hole of the traction beam, ensuring the connection accuracy.

[0060] Compared with related technologies, the auxiliary device for connecting the traction center pin of a high-speed train bogie provided by the present invention has the following advantages:

[0061] This invention provides an auxiliary device for connecting the traction center pin of a high-speed train bogie. The device is equipped with electric and manual dual adjustment modes. The automatic adjustment external connector 12 is compatible with multiple specifications of electric wrenches, which can realize the rapid lifting and lowering of the lifting platform. The height adjustment handle 11 can realize micro-precision adjustment, replacing the traditional manual lifting and prying operation, greatly reducing the physical exertion of the operator and improving the work efficiency.

[0062] The tapered connecting hole 9 of the center pin guide plate 8 enables precise alignment between the center pin and the bolt hole of the traction beam, avoiding errors caused by manual alignment and ensuring assembly accuracy. At the same time, during the installation of the square key and the pre-tightening of the bolts, there is no need for manual contact with dangerous parts, completely avoiding the risk of personal injury from mechanical crushing and improving operational safety.

[0063] Second Embodiment

[0064] Please refer to the following: Figure 3 , Figure 4 and Figure 5Based on the first embodiment of this application which provides an auxiliary device for connecting the traction center pin of a high-speed train bogie, the second embodiment of this application proposes another auxiliary device for connecting the traction center pin of a high-speed train bogie. The second embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the separate implementation of the first embodiment.

[0065] Specifically, the difference in the second embodiment of this application regarding the auxiliary device for connecting the traction center pin of a train bogie is that it also includes a bracket 14, which is disposed between the two lifting screws 5, and a housing 15 is mounted on the surface of the bracket 14.

[0066] A conveying device 16 is provided on the surface of the bracket 14 and on one side of the housing 15. The conveying device 16 includes a conveying pump 161, two first conveying pipes 162, a three-way connector 163, and two second conveying pipes 164. The conveying pump 161 is installed on the surface of the bracket 14. The two first conveying pipes 162 are respectively connected to the input end and the output end of the conveying pump 161. The three-way connector 163 is connected to one end of one of the first conveying pipes 162. The two second conveying pipes 164 are respectively connected to the two ends of the three-way connector 163.

[0067] Another first delivery pipe 162 is connected to the housing 15, and a filling head is installed on the housing 15.

[0068] One end of each of the two second delivery pipes 164 is connected to a liquid outlet 17.

[0069] The surfaces of the two lifting screws 5 are provided with a coating component 18. The coating component 18 includes a fixing ring 181 and a coating cotton 182. The fixing ring 181 is sleeved on the surface of the lifting screw 5, and the coating cotton 182 is disposed inside the fixing ring 181.

[0070] The applicator 182 is attached to the retaining ring 181 by Velcro. A mounting through hole adapted to the liquid outlet 17 is provided on one side of the retaining ring 181. The retaining ring 181 is connected to one end of the bracket 14.

[0071] The working principle of the auxiliary device for connecting the traction center pin of a high-speed train bogie provided by the present invention is as follows:

[0072] In use, when lubricating the two lifting screws 5, the delivery pump 161 is first started to deliver the lubricant inside the housing 15 to the two second delivery pipes 164 through the two first delivery pipes 162 and the three-way connector 163. After the lubricant is delivered to the two second delivery pipes 164, it is then delivered to the applicator cotton 182 inside the two fixed rings 181 through the two liquid outlets 17. When the applicator cotton 182 enters the lubricant and moves with the lifting screw 5, it comes into contact with the applicator cotton 182, thus achieving the effect of applying lubricant to the lifting screw 5.

[0073] Compared with related technologies, the auxiliary device for connecting the traction center pin of a high-speed train bogie provided by the present invention has the following advantages:

[0074] The present invention provides an auxiliary device for connecting the traction center pin of a high-speed train bogie. A box 15, a conveying device 16 and two liquid outlets 17 are provided on the surface of the bracket 14 to work with the coating component 18, so as to apply lubricant to the surface when the two lifting screws 5 are moving.

[0075] Third Embodiment

[0076] Please refer to the following: Figure 6 and Figure 7 Based on the first embodiment of this application, which provides an auxiliary device for connecting the traction center pin of a high-speed train bogie, the third embodiment of this application proposes another auxiliary device for connecting the traction center pin of a high-speed train bogie. The third embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the third embodiment will not affect the separate implementation of the first embodiment.

[0077] Specifically, the difference in the auxiliary device for connecting the traction center pin of a train bogie provided in the third embodiment of this application is that it also includes multiple disassembly components 19. The multiple disassembly components 19 are respectively disposed between the support leg 1 and the mounting plate 2. Each disassembly component 19 includes a disassembly groove 191, a disassembly block 192, and a bolt 193. The disassembly groove 191 is opened at the top of the support leg 1, the disassembly block 192 is disposed inside the disassembly groove 191, and the bolt 193 is disposed between the disassembly block 192 and the support leg 1.

[0078] The disassembly slot 191 and the disassembly block 192 are T-shaped and are adapted to each other. A threaded hole adapted to the bolt 193 is provided between the disassembly block 192 and the support bracket 1. The disassembly block 192 is connected to the mounting plate 2.

[0079] The working principle of the auxiliary device for connecting the traction center pin of a high-speed train bogie provided by the present invention is as follows:

[0080] When using, when disassembling the mounting plate 2 and the support leg 1, first remove the bolt 193 between the disassembly block 192 and the support leg 1. After the bolt 193 is removed, pull the mounting plate 2 to separate the disassembly block 192 at the bottom from the disassembly groove 191.

[0081] Compared with related technologies, the auxiliary device for connecting the traction center pin of a high-speed train bogie provided by the present invention has the following advantages:

[0082] The present invention provides an auxiliary device for connecting the traction center pin of a train bogie, wherein multiple disassembly components 19 are provided between the support bracket 1 and the mounting plate 2 to facilitate the installation and disassembly of the mounting plate 2 and the support bracket 1.

[0083] A connection method for an auxiliary device for connecting the traction center pin of a bogie in a high-speed train includes the following steps:

[0084] S1. Device deployment and preliminary verification: The auxiliary device is precisely placed in the preset assembly station under the bogie traction beam, so that the positioning reference surface of the center pin guide plate 8 is aligned with the assembly mark on the lower surface of the traction beam. Check the tightness of the connection of each component of the device, connect the automatic adjustment external connector 12 with the calibrated electric wrench, and verify that the lifting function of the lifting screw 5 is normal.

[0085] S2. Traction beam support and square key installation: Start the electric wrench to drive the lifting screw 5 to rise, so that the center pin guide plate 8 slowly fits the lower part of the traction beam. Rotate the height adjustment handle 11 to complete the fine adjustment and locking of the horizontal posture of the traction beam. Use a special copper tool to smoothly knock the square key into the groove along the axis of the center pin square key alignment groove to ensure that the fit clearance meets the standard and there is no jamming or loosening.

[0086] S3. Precise alignment of the center pin: The lifting screw 5 is driven in reverse by the electric wrench to lower the center pin guide plate 8 to a safe distance of ≥200mm from the traction beam. The auxiliary device is moved along the axis of the traction beam. The center pin tapered connecting hole 9 of the center pin guide plate 8 is used to guide the center pin to achieve precise coaxial alignment with the bolt hole of the traction beam.

[0087] S4. Bolt Assembly and Tightening Finishing: Install the 55-type sleeve, center pin bolt, three-layer washer, and center pin pressure plate into the center pin tapered connection hole 9 in sequence. Drive the lifting screw 5 to align the front end of the center pin bolt with the center pin thread hole inlet. Replace the ratchet wrench to complete the bolt pre-tightening. Simultaneously rotate the height adjustment handle 11 to fine-tune the pressure plate height so that the pressure plate is completely in contact with the upper surface of the center pin. Use a calibrated torque wrench to complete the final bolt tightening at the rated torque of 1100 N·m. Finally, drive the lifting screw 5 to descend so that the guide pressure plate is disengaged from the traction beam. Disconnect the device from the electric wrench to complete all connection operations of the center pin.

[0088] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An auxiliary device for connecting the traction center pin of a high-speed train bogie, characterized in that, include: Support legs, mounting plate, coupling, two lifting platforms, two lifting screws, two flat-head support joints, center pin support base and center pin guide plate; The mounting plate is installed on the top of the support frame; The coupling is located at the center of the mounting plate surface; The two lifting platforms are symmetrically installed on the surface of the mounting plate and located at both ends of the coupling; The two lifting screws are respectively installed inside the two lifting machines; The two flat-headed support joints are respectively connected to the top ends of the two lifting screws; The central pin support base is connected between the two flat-head support joints; The center pin guide plate is installed on the surface of the center pin support base.

2. The auxiliary device for connecting the traction center pin of the EMU bogie according to claim 1, characterized in that, The center pin guide plate has a center pin tapered connection hole at its center.

3. The auxiliary device for connecting the traction center pin of the EMU bogie according to claim 1, characterized in that, The two ends of the coupling are respectively connected to an adjusting wheel and an automatic adjusting external connector.

4. The auxiliary device for connecting the traction center pin of the EMU bogie according to claim 3, characterized in that, The surface of the adjusting wheel is connected to a height adjusting handle, and a mounting base is installed on one side of each of the two lifting machines.

5. The auxiliary device for connecting the traction center pin of the EMU bogie according to claim 1, characterized in that, A bracket is provided between the two lifting screws, and a housing is mounted on the surface of the bracket.

6. The auxiliary device for connecting the traction center pin of the EMU bogie according to claim 5, characterized in that, A conveying device is provided on the surface of the bracket and on one side of the box. The conveying device includes a conveying pump, two first conveying pipes, a T-joint, and two second conveying pipes. The conveying pump is installed on the surface of the bracket. The two first conveying pipes are respectively connected to the input end and the output end of the conveying pump. The T-joint is connected to one end of one of the first conveying pipes, and the two second conveying pipes are respectively connected to the two ends of the T-joint.

7. The auxiliary device for connecting the traction center pin of a high-speed train bogie according to claim 6, characterized in that, One end of each of the two second delivery pipes is connected to a liquid outlet.

8. The auxiliary device for connecting the traction center pin of the EMU bogie according to claim 1, characterized in that, The surfaces of the two lifting screws are provided with a coating component, which includes a fixing ring and a coating cotton. The fixing ring is sleeved on the surface of the lifting screw, and the coating cotton is disposed inside the fixing ring.

9. The auxiliary device for connecting the traction center pin of a high-speed train bogie according to claim 1, characterized in that, Multiple disassembly components are provided between the support leg and the mounting plate. Each disassembly component includes a disassembly groove, a disassembly block, and a bolt. The disassembly groove is located at the top of the support leg, the disassembly block is located inside the disassembly groove, and the bolt is located between the disassembly block and the support leg.

10. A connection method for an auxiliary device for connecting the traction center pin of a high-speed train bogie, as described in any one of claims 1 to 4, characterized in that, Includes the following steps: S1. Device Deployment and Preliminary Verification: Place the auxiliary device precisely at the preset assembly station below the bogie traction beam, align the positioning reference surface of the center pin guide plate with the assembly mark on the lower surface of the traction beam, check the tightness of the connections of each component of the device, connect the automatic adjustment external connector with the calibrated electric wrench, and verify that the lifting function of the lifting screw is normal. S2. Traction beam support and square key installation: Start the electric wrench to drive the lifting screw to rise, so that the center pin guide plate slowly fits the lower part of the traction beam. Rotate the height adjustment handle to complete the fine adjustment and locking of the horizontal posture of the traction beam. Use a special copper tool to smoothly knock the square key into the groove along the axis of the center pin square key alignment groove to ensure that the fit clearance meets the standard and there is no jamming or loosening. S3. Precise alignment of the center pin: The lifting screw is driven in reverse by an electric wrench, so that the center pin guide plate is lowered to maintain a safe distance of ≥200mm from the traction beam. The auxiliary device is moved along the axis of the traction beam, and the guiding effect of the tapered connecting hole of the center pin on the center pin guide plate is used to make the center pin and the bolt hole of the traction beam coaxially and precisely aligned. S4. Bolt Assembly and Tightening Finishing: Install the 55-type sleeve, center pin bolt, three-layer washer, and center pin pressure plate into the center pin tapered connection hole in sequence. Drive the lifting screw to align the front end of the center pin bolt with the center pin thread hole inlet. Replace the ratchet wrench to complete the bolt pre-tightening. Simultaneously rotate the height adjustment handle to fine-tune the pressure plate height so that the pressure plate is completely in contact with the upper surface of the center pin. Use a calibrated torque wrench to complete the final bolt tightening at the rated torque of 1100 N·m. Finally, drive the lifting screw to descend and disengage the guide pressure plate from the traction beam. Disconnect the device from the electric wrench to complete all connection operations of the center pin.

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