Device and method for disassembling and assembling rotating shaft in sliding plug door mechanism

Abstract

The invention provides a mechanical dismounting and mounting device and method for a rotating shaft in a sliding plug door mechanism, and the device comprises a main body frame which is of a rigid structure formed by welding a bottom beam, side beams, a middle beam and a top beam, and the middle part of the middle beam is provided with a guide through hole; the power driving system comprises a hydraulic jack, and the hydraulic jack is detachably connected with a bottom beam of the main body frame through a fixing assembly; the limiting and guiding assembly comprises a top limiting block, and the top limiting block is detachably connected with the middle beam and provided with a U-shaped positioning groove; and the bottom beam fixing device is connected with the bottom beam and is used for fixing the main body frame. The device is safe, efficient, accurate in control, stable in structure and high in adaptability.

Description

Technical Field

[0001] This invention belongs to the field of rail vehicle inspection and maintenance technology, and in particular relates to a device and method for disassembling and assembling the rotating shaft in a sliding door mechanism. Background Technology

[0002] The sliding door of a rail vehicle is a critical component for passenger safety. The axle connecting the roller trolley, the swing arm, and the connecting plate transition section requires disassembly and maintenance after a certain mileage or during major overhauls. Current maintenance processes suffer from the following problems: The axle is commonly disassembled and reassembled using manual hammering, which easily damages the axle surface and reduces the precision of internal bearings, thus affecting the smoothness and reliability of the sliding door's operation; manual operation cannot precisely control the applied axial force, making it difficult to guarantee the fit between components and affecting assembly quality; manual operation is inefficient, with each disassembly and reassembly taking too long, failing to meet the stringent time requirements of major vehicle overhauls; furthermore, hammering poses significant safety hazards, with operators at risk of hand injury, and does not comply with modern industrial safety operating procedures.

[0003] Chinese patent CN202120345678.9 discloses a door hinge disassembly and assembly tool, which uses a screw drive. However, in practical applications, this device suffers from insufficient driving force and imprecise stroke control, limiting its widespread use.

[0004] Therefore, there is an urgent need in this field for a dedicated disassembly and assembly device with a more reasonable structure, safer operation, higher efficiency, and greater adaptability to solve the above-mentioned technical problems. Summary of the Invention

[0005] This invention aims to solve the problems of safety risks, low efficiency and easy damage to components caused by traditional hand hammer operation, and provides a device and method for disassembling and assembling the rotating shaft in the sliding door mechanism, so as to achieve safe, efficient and accurate disassembly and assembly of the rotating shaft, thereby significantly improving maintenance quality and efficiency, and ensuring the accuracy of rotating shaft disassembly and assembly and the reuse rate of components.

[0006] To achieve the above-mentioned objectives, the present invention provides a mechanical disassembly and assembly device for the rotating shaft in a sliding door mechanism, comprising:

[0007] The main frame is a rigid structure welded together from bottom beams, side beams, middle beams and top beams, with a guide through hole in the middle of the middle beam;

[0008] The power drive system includes a hydraulic jack, which is detachably connected to the bottom beam of the main frame via a fixing component;

[0009] The limiting and guiding assembly includes a top limiting block, which is detachably connected to the middle beam and is provided with a U-shaped positioning groove;

[0010] A bottom beam fixing device is connected to the bottom beam and is used to fix the main frame.

[0011] Furthermore, the main frame is constructed from high-strength square tubing welded together, with triangular reinforcing ribs at its four corners, and the diameter of the guide through hole is set to 1.2 times the diameter of the rotating shaft to be disassembled.

[0012] Furthermore, the hydraulic jack has a vertical structure with a jack cap on top, and a flexible contact layer is provided on the jack cap; the hydraulic jack is equipped with a jack rocker arm, a jack height adjusting screw, a jack oil valve, and a pressure display gauge.

[0013] Furthermore, the fixing assembly includes fixing clips and fastening bolts for fixing the hydraulic jack to the bottom beam.

[0014] Furthermore, the top limiting block is detachably connected to the middle beam via a fixing strap; the width of the U-shaped positioning groove matches the size of the bottom boss of the trolley to be disassembled.

[0015] Furthermore, the bottom beam fixing device includes a first longitudinal beam, a second longitudinal beam, a fixing block, and fixing bolts, and the first longitudinal beam and the second longitudinal beam are connected to the bottom beam by the fixing block and fixing bolts.

[0016] The present invention also provides a method for disassembling a rotating shaft using the above-mentioned mechanical disassembly and assembly device. The rotating shaft connecting components to be disassembled include a rotating shaft, a rotating arm frame, and a connecting plate transition piece, and include the following steps:

[0017] Adjust the height adjustment screw of the jack, place the boom frame and connecting plate transition assembly to be disassembled on the jack cap, align the lower part of the shaft with the jack cap and make contact, and ensure that the shaft axis is coaxial with the jack cap;

[0018] Align the U-shaped positioning groove on the top limit block with the bottom boss of the swing arm;

[0019] Manipulate the jack lever to raise the jack cap. When the trolley connecting components rise with the cap until the boom contacts the top limit block, ensure that the axis of the rotating shaft is coaxial with the guide hole.

[0020] Continue manipulating the jack lever to raise the jack cap. Monitor the lifting force using the pressure gauge. Apply pressure until the shaft completely exits the boom mounting hole and enters the U-shaped positioning groove to complete disassembly.

[0021] The present invention also provides a method for installing a rotating shaft using the above-mentioned mechanical disassembly and assembly device, wherein the rotating shaft connection components to be installed include a rotating shaft, a rotating arm frame, and a connecting plate transition component, and includes the following steps:

[0022] Adjust the height adjustment screw of the jack to the shorter position, place the shaft to be installed on the top cap of the jack, align the lower part of the shaft with the top cap of the jack and make contact, and ensure that the axis of the shaft is coaxial with the top cap of the jack;

[0023] After assembling the connecting plate transition piece and the swing arm, place them between the upper part of the swing shaft and the top limiting block, so that the mounting holes on the swing arm are aligned with the upper part of the swing shaft.

[0024] Manipulate the jack lever to push the jack cap to rise the shaft, and the connecting plate transition piece and the boom will rise accordingly. When the boom contacts the top limit block, ensure that the upper mounting hole of the boom is aligned with the U-shaped positioning groove.

[0025] Continue manipulating the jack lever to push the jack cap to continue rising. Monitor the lifting force through the pressure gauge. Push the jack into the concentric mounting holes of the boom and connecting plate transition piece to complete the installation.

[0026] Compared with the prior art, the device provided by the present invention has the following significant advantages:

[0027] Safe and efficient: The controllable hydraulic drive completely replaces dangerous manual hammering, fundamentally avoiding the risk of component damage and operator hand injury caused by impact. The disassembly and assembly time of a single shaft can be reduced to less than 10 minutes, significantly improving maintenance efficiency.

[0028] Precise control: The pressure display gauge equipped with the hydraulic system can monitor and adjust the lifting force in real time with precision; combined with the stroke limit and guide structure composed of the top limit block and guide through hole, it can ensure the axial alignment and precise control of the force of the rotating shaft during disassembly and assembly, thereby ensuring the fitting accuracy between components.

[0029] Stable structure: The high-strength square tube welded frame is supplemented with triangular reinforcing ribs, which enables the overall load-bearing capacity of the device to reach 5 tons. The structure has good rigidity and can meet the needs of long-term, high-frequency use.

[0030] High adaptability: The top limit block adopts a quick-replacement design. By replacing the limit block with different specifications (mainly adjusting the U-shaped groove size), it can be adapted to the maintenance of the rotating shaft of various models of sliding door mechanisms, with good versatility. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the disassembly and assembly device of the present invention.

[0032] Figure 2 This is a schematic diagram of the power drive system installation.

[0033] Figure 3 A schematic diagram of the jack cap and flexible contact layer;

[0034] Figure 4 Schematic diagram of the connection between the swing arm frame and the connecting plate transition part through a rotating shaft

[0035] Among them: 1. Main body frame; 101. Bottom beam; 102. Side beam; 103. Middle beam; 104. Top beam; 105. Guide through hole; 106. Triangular stiffening rib plate; 2. Power drive system; 201. Hydraulic jack; 201a. Jack rocker; 201b. Jack height adjustment screw; 201c. Jack top cap; 201d. Jack oil valve; 201e. Flexible contact layer; 201f. Pressure display meter; 202. Fixed component; 202a. Fixed clamp; 202b. Fastening bolt; 3. Limit and guide component; 301. Top limit block; 301a. U-shaped positioning groove; 302. Fixed tie; 4. Bottom beam fixing device; 401. First longitudinal beam; 402. Second longitudinal beam; 403. Fixed block; 404. Fixed bolt; 10. Rotating shaft cover fixing screw; 20. Rotating shaft cover; 30. Rotating shaft; 40. Axial thrust needle roller bearing; 50. Swing arm frame; 60. Roller pulley; 70. Connecting plate transition part Specific implementation method

[0036] In order to better understand the purpose, structure and function of the present invention, the following further describes in detail a device and method for disassembling and assembling a rotating shaft in a plug door mechanism of the present invention with reference to the accompanying drawings

[0037] Refer to Figures 1 to 4 , a mechanical disassembly and assembly device for the rotating shaft of a plug door mechanism of a rail vehicle, comprising:

[0038] 1. Main body frame 1: It is welded by 38mm×60mm high-strength square tubes to form a rigid structure. The welds of the main body frame are ultrasonically inspected and meet the GB / T 11345-2013 B-level standard. It includes a bottom beam 101, side beams 102, a middle beam 103 and a top beam 104. The bottom beam 101, side beams 102, middle beam 103 and top beam 104 are welded into a rigid structure in the shape of a Chinese character 'Ri'. A guide through hole 105 with a diameter 1.2 times the diameter of the rotating shaft is opened in the middle of the middle beam 103, and triangular stiffening rib plates 106 are arranged at the four corners. The overall dimensions are 880mm in height and 495mm in width

[0039] 2. Power drive system 2: A 5-ton vertical hydraulic jack 201 is adopted, and is equipped with a jack rocker 201a, a jack height adjustment screw 201b, a jack oil valve 201d, a jack top cap 201c and a flexible contact layer 201e and a pressure display meter 201f thereon. The fixed component 202 includes a fixed clamp 202a and an M6 bolt 202b. The jack is detachably connected to the bottom beam fixing device 4 through the fixed clamp 202a and the M6 bolt 202b, and cooperates with the top limit block 301 to jointly achieve precise stroke control

[0040] 3. Limiting and guiding assembly 3: The top limiting block 301 is detachably connected to the middle beam 103 via a fixing strap 302, allowing for quick replacement when the top limiting block 301 becomes worn. The top limiting block 301 is provided with a U-shaped positioning groove 301a, the width of which matches the bottom boss of the trolley.

[0041] 4. Bottom beam fixing device 4: The bottom beam fixing device 4 includes a first longitudinal beam 401, a second longitudinal beam 402, a fixing block 403, and a fixing bolt 404. The first longitudinal beam 401 and the second longitudinal beam 402 are reliably connected to the bottom beam 101 through the fixing block 403 and the fixing bolt 404. The bottom beam fixing device 4 ensures the overall stability of the device and prevents shaking during operation.

[0042] 5. The guide hole 105 on the middle beam 103 can ensure that when the rotating shaft 30 is lifted too high by the top cap 201c during operation, the rotating shaft 30 will automatically enter the guide hole 105 on the middle beam 103, thereby ensuring that the rotating shaft 30 will not be accidentally damaged.

[0043] Taking the rotating shaft of the boom and connecting plate transition piece of this invention as an example, the relevant components include a rotating shaft cover plate fixing screw 10, a rotating shaft cover plate 20, a rotating shaft 30, an axial thrust needle roller bearing 40, a boom 50, and a connecting plate transition piece 70. The connecting plate transition piece 70 extends into the recessed space inside the boom and is connected via the rotating shaft. The specific installation steps are as follows:

[0044] Example 1: Shaft disassembly operation

[0045] 1. Manually remove the fixing screws 10 and the shaft cover 20, adjust the length of the jack height adjusting screw 201b, and then place the boom frame and connecting plate transition assembly to be disassembled on the jack cap 201c, so that the lower part of the shaft 30 is aligned with and in contact with the jack cap 201c, ensuring that the axis of the shaft 30 is coaxial with the jack cap 201c.

[0046] 2. Align the U-shaped positioning groove 301a on the top limiting block 301 with the boom boss.

[0047] 3. Then manipulate the jack lever 201a to raise the jack cap 201c. The boom frame and connecting plate transition assembly to be disassembled will rise together with the jack cap 201c. When the boom frame 50 contacts the top limit block 301, ensure that the upper part of the rotating shaft 30 is aligned with the U-shaped positioning groove 301a and that the axis of the rotating shaft 30 is coaxial with the guide through hole 105.

[0048] 4. Then continue manipulating the jack lever 201a to raise the jack cap 201c. Monitor the lifting force using the pressure gauge 201f; it should be within the normal range. Continue applying pressure until the pivot 30 is completely disengaged. Since the boom 50 cannot rise further after contacting the top limit block 301, the jack cap 201c will push the pivot 30 upwards, causing it to disengage from the boom 50 mounting hole and enter the U-shaped positioning groove 301a. Adjust the jack height adjusting screw 201b to lower it, remove the connecting plate transition piece 70, and complete the disassembly. During this process, the flexible contact layer 201e will act as a buffer, protecting the pivot 30.

[0049] Example 2: Shaft Installation Operation

[0050] 1. First, shorten the height adjustment screw 201b of the jack. Place the shaft 30 to be installed on the jack cap 201c, so that the lower part of the shaft 30 is aligned with and in contact with the jack cap 201c, and ensure that the axis of the shaft 30 is coaxial with the jack cap 201c.

[0051] 2. After assembling the connecting plate transition piece 70 and the rotating arm frame 50, place them between the upper part of the rotating shaft 30 and the top limiting block 301, while aligning the mounting holes on the rotating arm frame 50 with the upper part of the rotating shaft 30.

[0052] 3. Operate the jack lever 201a to make the jack cap 201c push the rotating shaft 30 to rise. The connecting plate transition piece 70 and the boom 50 will also rise together. When the boom 50 contacts the top limit block 301, make sure that the upper mounting hole of the boom 50 is aligned with the U-shaped positioning groove 301a.

[0053] 4. Continue operating the jack lever 201a to allow the jack cap 201c to push the shaft 30 upwards. Monitor the lifting force using the pressure gauge 201f; it should be within the normal range. Since the boom 50 cannot rise further after contacting the top limit block 301, the jack cap 201c will push the shaft 30 into the concentric mounting holes of the boom 50 and the connecting plate transition piece 70, thus completing the installation. When the shaft 30 extends between the two mounting holes, the axial thrust needle roller bearing 40 is fitted onto it. After the shaft is installed, a shaft cover plate 20 is installed at the end of the shaft and secured with the shaft cover plate fixing screws 10. During the process, the flexible contact layer 201e will act as a buffer, protecting the shaft 30.

[0054] The shaft connecting the boom 50 and the roller trolley 60 is connected in the same way as described above, and can also be disassembled and installed in the same way as described above, which will not be described in detail.

[0055] Precautions for use

[0056] 1. Before starting work, check the connection status of all fasteners to ensure that they are not loose;

[0057] 2. The working pressure of the hydraulic system shall not exceed 5MPa, and the lifting speed shall be controlled within 2mm / s;

[0058] 3. The top limit block 301 can be replaced to accommodate different shaft diameters. Different trolley models require replacement with the corresponding specification of the top limit block 301.

[0059] 4. Before using the product after a long period of inactivity, a no-load test run must be conducted.

Claims

1. A mechanical disassembly and assembly device for a rotating shaft in a sliding door mechanism, characterized in that, include: The main frame (1) is a rigid structure welded together from the bottom beam (101), side beam (102), middle beam (103) and top beam (104). The middle beam (103) has a guide through hole (105) in the middle. The power drive system (2) includes a hydraulic jack (201), which is detachably connected to the bottom beam (101) of the main frame (1) via a fixing component (202); The limiting guide assembly (3) includes a top limiting block (301), which is detachably connected to the middle beam (103) and is provided with a U-shaped positioning groove (301a); The bottom beam fixing device (4) is connected to the bottom beam (101) and is used to fix the main frame (1).

2. The mechanical disassembly and assembly device according to claim 1, characterized in that, The main frame (1) is made of high-strength square tube welded together, and triangular reinforcing ribs (106) are provided at its four corners. The diameter of the guide through hole (105) is set to 1.2 times the diameter of the shaft to be disassembled.

3. The mechanical disassembly and assembly device according to claim 1, characterized in that, The hydraulic jack (201) has a vertical structure and a jack cap (201c) on its top. The jack cap (201c) is provided with a flexible contact layer (201e). The hydraulic jack (201) is equipped with a jack rocker arm (201a), a jack height adjusting screw (201b), a jack oil valve (201d), and a pressure display gauge (201f).

4. The mechanical disassembly and assembly device according to claim 1 or 3, characterized in that, The fixing component (202) includes a fixing clip (202a) and a fastening bolt (202b) for fixing the hydraulic jack (201) to the bottom beam (101).

5. The mechanical disassembly and assembly device according to claim 1, characterized in that, The top limiting block (301) is detachably connected to the middle beam (103) by a fixing strap (302); the width of the U-shaped positioning groove (301a) matches the size of the bottom boss of the trolley to be disassembled.

6. The mechanical disassembly and assembly device according to claim 1, characterized in that, The bottom beam fixing device (4) includes a first longitudinal beam (401), a second longitudinal beam (402), a fixing block (403), and a fixing bolt (404), which connect the first longitudinal beam (401) and the second longitudinal beam (402) to the bottom beam (101).

7. A method for disassembling a rotating shaft using the mechanical disassembly and assembly device as described in any one of claims 3-4, wherein the connecting components of the rotating shaft to be disassembled include a rotating shaft (30), a rotating arm (50), and a connecting plate transition member (70), characterized in that, Including the following steps: Adjust the jack height adjusting screw (201b), place the boom frame and connecting plate transition assembly to be disassembled on the jack cap (201c), so that the lower part of the shaft (30) is aligned with and in contact with the jack cap (201c), and ensure that the axis of the shaft (30) is coaxial with the jack cap (201c); Align the U-shaped positioning groove (301a) on the top limiting block (301) with the bottom boss of the swing arm; Manipulate the jack lever (201a) to raise the jack cap (201c). When the trolley connecting components rise with the cap to the top limit block (301) of the boom (50), ensure that the axis of the shaft (30) is coaxial with the guide hole (105). Continue to manipulate the jack lever (201a) to make the jack cap (201c) continue to rise. Monitor the lifting force through the pressure display gauge (201f). Apply pressure until the shaft (30) completely exits the boom (50) and the mounting hole and enters the U-shaped positioning groove (301a) to complete the disassembly.

8. A method for installing a rotating shaft using the mechanical disassembly and assembly device as described in any one of claims 3-4, wherein the connecting components of the rotating shaft to be installed include a rotating shaft (30), a rotating arm (50), and a connecting plate transition member (70), characterized in that, Including the following steps: Adjust the height adjustment screw (201b) of the jack to a shorter position, place the shaft (30) to be installed on the jack cap (201c), align the lower part of the shaft (30) with the jack cap (201c) and make contact, and ensure that the axis of the shaft (30) is coaxial with the jack cap (201c); After assembling the connecting plate transition piece (70) and the swing arm (50), place them between the upper part of the swing shaft (30) and the top limiting block (301) so that the mounting holes on the swing arm (50) are aligned with the upper part of the swing shaft (30); Manipulate the jack lever (201a) to make the jack cap (201c) push the shaft (30) to rise, and the connecting plate transition piece (70) and the boom (50) rise accordingly. When the boom (50) contacts the top limit block (301), ensure that the upper mounting hole of the boom (50) is aligned with the U-shaped positioning groove (301a). Continue to manipulate the jack lever (201a) to make the jack cap (201c) push the shaft (30) to continue to rise. Monitor the lifting force through the pressure display gauge (201f) and push the shaft (30) into the concentric mounting hole of the boom frame (50) and the connecting plate transition piece (70) to complete the installation.

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