Sand blasting false trolley and railway passenger car platform changing sand blasting process

Abstract

The application discloses a sanding false trolley, which comprises a trolley framework, a wheel pair device arranged at the bottom of the trolley framework, a supporting beam arranged at the top of the trolley framework and a bearing mechanism arranged on the supporting beam; the trolley framework is a closed framework, and a side bearing is arranged on each side of the trolley framework, and the bearing height of the side bearing is adjustable; the bearing mechanism comprises a rocker arm and first and second center pins arranged side by side, wherein the rocker arm can be switched between a first position and a second position to selectively control the first center pin or the second center pin to move to a bearing position of the supporting beam. The sanding false trolley adopts a closed framework, and the sanding process can avoid the accumulation of steel shots, reduce or even eliminate the loss of steel shots during operation, and reduce the purchase cost of steel shots; the center pin is quickly switched and controlled through the rocker arm, so that the sanding false trolley can basically cover all types of bogie detection required on the market, has good universality, and greatly reduces the maintenance cost.

Description

Technical Field

[0001] This invention relates to the field of rail vehicle maintenance technology, and in particular to a sandblasting dummy trolley and a sandblasting process for changing trolleys in railway passenger cars. Background Technology

[0002] When performing maintenance work on rail vehicles, dummy trolleys are usually used to scaffold the vehicle body for the operation. However, each dummy trolley typically corresponds to only one type of rail vehicle. If the rail vehicles are of different models, different dummy trolleys need to be called for the operation, which has disadvantages such as high maintenance costs and long maintenance time.

[0003] Furthermore, since the frames of existing dummy trolleys are mostly made of welded steel profiles, some sandblasting steel shot will accumulate inside the dummy trolley during the sandblasting process. This will have the following effects during subsequent on-board inspections: 1. The sandblasting steel shot is difficult to clean completely and will be lost during the transfer of the trolley, increasing the procurement cost of steel shot; 2. During the transfer of the trolley for maintenance, steel shot will be scattered on the rail surface and its surroundings, causing some damage to the wheel treads of the trolley after maintenance.

[0004] Based on the above problems, this invention specifically proposes a sandblasting dummy trolley and railway passenger car sandblasting process for sandblasting. Summary of the Invention

[0005] The purpose of this invention is to provide a sandblasting dummy trolley and a sandblasting process for changing railway passenger cars. By improving the existing dummy trolley structure, it is made compatible with different types of rail vehicles and the problem of steel shot loss during the sandblasting process is solved.

[0006] The objective of this invention is achieved through the following technical solution: A sandblasting dummy trolley includes a frame, a wheelset assembly at the bottom of the frame, a support beam at the top of the frame, and a load-bearing mechanism on the support beam. The vehicle frame is a closed frame, and each side of the vehicle frame is provided with a side bearing, the load-bearing height of which is adjustable. The bearing mechanism includes a rocker arm and a first center pin and a second center pin arranged side by side. The rocker arm can switch between a first position and a second position to selectively control the first center pin or the second center pin to move to the bearing position of the support beam.

[0007] In some embodiments, the vehicle frame is a rectangular structure consisting of two crossbeams and two side beams; wherein the crossbeams and the side beams are hollow square steel made of weathering steel plates.

[0008] In some embodiments, a plurality of vibrators are spaced apart on the inner top of the vehicle frame.

[0009] In some embodiments, the side bearing includes a support base and a pad; wherein the support base is fixed to the corresponding side beam, and the top of the support base is provided with a receiving groove, and the pad can be replacedly placed in the receiving groove.

[0010] In some embodiments, recesses are provided on both sides of the receiving groove.

[0011] In some embodiments, the first center pin is a cylindrical structure with a mating protrusion at the top, and the first center pin is capable of circumferential rotation. The second center pin has a columnar structure and is capable of circumferential rotation.

[0012] In some embodiments, the support mechanism further includes: A movable plate is slidably disposed above the support beam, and the first center pin and the second center pin are disposed side by side on the movable plate; A rack is slidably disposed below the support beam, and the rack is fixedly connected to the movable plate through a connecting block that passes through the support beam; A gear is rotatably disposed below the support beam and meshes with the rack, and the rocker arm is fixedly connected to the gear.

[0013] In some embodiments, a height adjuster is provided between the first center pin and the shown movable plate, and between the second center pin and the shown movable plate.

[0014] In some embodiments, the rocker arm can lock with the support beam in a first position and a second position, respectively.

[0015] In some embodiments, the bottom of the support beam is provided with a first positioning hole and a second positioning hole respectively; The rocker arm is provided with a positioning pin and a button at its front and rear ends, respectively. The positioning pin and the button are connected by a connecting rod built into the rocker arm. A first spring is provided in the middle of the connecting rod to cooperate with the positioning pin and the button. In the initial state, both the button and the positioning pin are exposed on the surface of the rocker arm, and the positioning pin can lock with the first positioning hole and the second positioning hole respectively.

[0016] In some embodiments, an extension rod is provided on the side of the button away from the connecting rod, and a second spring is provided on the extension rod, the second spring being distributed side by side with the first spring.

[0017] In some embodiments, a traction ring and a detachable wheel stop are respectively provided on the left and right sides of the vehicle frame, and anti-collision blocks are provided at both the front and rear ends of the vehicle frame.

[0018] A sandblasting process for changing platforms on railway passenger cars utilizes the aforementioned sandblasting dummy car.

[0019] In some embodiments, the railway passenger car changing and sandblasting process includes the following steps: S1. Use a dummy trolley to move the vehicle to be inspected to the sand-making room changing area, and use a vehicle lifting machine to lift the vehicle on the dummy trolley. S2. Move the sand-blasting dummy trolley to the sand room changing area, select the first center pin or the second center pin according to the bogie model of the vehicle, and adjust the bearing height of the side bearing. S3. Slowly lower the vehicle so that it lands stably on the sandblasting dummy trolley, and then enter the sandblasting room; S4. After ensuring the safety of the vehicle and the sandblasting dummy trolley, carry out the sandblasting operation on the vehicle according to the process documents. S5. Remove the safety fixed position protection, use the sandblasting dummy trolley to move the sandblasted vehicle to the sandblasting room change area, and use the jacking machine to lift the vehicle on the sandblasting dummy trolley so that the running dummy trolley replaces the sandblasting dummy trolley. S6. Use a dummy trolley to move the vehicle to the next process, and then return the sandblasting dummy trolley to its original position.

[0020] Compared with the prior art, the beneficial effects of the present invention include at least the following: 1. The enclosed frame allows the sandblasting dummy trolley to avoid steel shot accumulation during the sandblasting process, reducing or even eliminating steel shot loss during operation and lowering steel shot procurement costs.

[0021] 2. By quickly switching the control center pin via the rocker arm, the sandblasting dummy trolley can basically cover the testing needs of various types of bogies on the market, with good versatility and greatly reducing maintenance costs.

[0022] 3. The new sandblasting process significantly reduces the consumption of steel shot and eliminates the problem of steel shot spilling onto the rail surface and surrounding areas of the operating route. This avoids damage to the wheel treads after maintenance and ensures the quality of vehicle maintenance. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the sandblasting dummy trolley of the present invention.

[0024] Figure 2 This is a structural schematic diagram of the sandblasting dummy trolley of the present invention from another perspective.

[0025] Figure 3 This is a schematic diagram of the side support structure of the present invention.

[0026] Figure 4 This is a schematic diagram of the supporting mechanism of the present invention.

[0027] Figure 5 This is a partial structural schematic diagram of the support mechanism of the present invention.

[0028] Figure 6 This is a schematic diagram of the internal structure of the rocker arm of the present invention.

[0029] Figure 7 This is a schematic diagram of the process for sandblasting and changing the platform of a railway passenger car according to the present invention.

[0030] In the diagram: 1. Vehicle frame; 101. Crossbeam; 102. Side beam; 2. Wheelset assembly; 3. Support beam; 301. First positioning hole; 302. Second positioning hole; 303. Strip hole; 4. Side bearing; 401. Support seat; 4011. Receiving groove; 4012. Notch; 402. Pad; 5. Rocker arm; 6. First center pin; 601. Mud-fitting groove; 7. Second center pin; 8. Moving plate; 9. Rack; 10. Connecting block; 11. Gear; 12. Height adjuster; 13. Positioning pin; 14. Button; 15. Connecting rod; 16. First spring; 17. Extension rod; 18. Second spring; 19. Vibrator; 20. Traction ring; 21. Wheel stop; 22. Anti-collision block. Detailed Implementation

[0031] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided to make the invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0032] The terms used to express position and direction in this invention are illustrated with reference to the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this invention.

[0033] See that Figure 1 and Figure 2 As shown, the present invention discloses a sandblasting dummy trolley, including a frame 1, a wheel set device 2, a support beam 3, and a load-bearing mechanism.

[0034] The frame 1 is a rectangular structure consisting of two crossbeams 101 and two side beams 102. Both the crossbeams 101 and the side beams 102 are hollow square steel made of weathering steel plates. While ensuring structural strength, the frame 1 forms a closed frame, which prevents steel shot from accumulating on it during sandblasting and effectively prevents steel shot from being lost during operation.

[0035] In addition, each side of the vehicle frame 1 is provided with a side bearing 4, which can be installed on the side beam 102 of the vehicle frame 1 to support the sides of the transformation frame of the vehicle to be inspected, preventing rollover. Furthermore, the load-bearing height of the side bearing 4 is adjustable to meet the side support requirements of different vehicle models. For example, see [link to example]. Figure 3 As shown, the side bearing 4 includes a support base 401 and a pad 402. The support base 401 is fixed to the corresponding side beam 102, and a receiving groove 4011 is provided on the top of the support base 401. The pad 402 can be replaced and placed in the receiving groove 4011. By replacing the pads 402 with different thicknesses, the bearing height of the side bearing 4 can be quickly adjusted. In this application, the pad 402 is preferably a nylon pad, which has good mechanical strength and can withstand high pressure and load.

[0036] The wheelset assembly 2 is located at the bottom of the vehicle frame 1. Specifically, the wheelset assembly 2 can be connected via the axle box (located in...). Figure 2 The wheel center position is connected to the side beam 102 of the frame 1 to support the movement of the sandblasting dummy trolley.

[0037] Support beam 3, as the load-bearing component, can also be made of weathering steel plate to ensure the reliability of the support. (See also...) Figure 1 As shown, the support beam 3 is located on the top of the vehicle frame 1, and its two ends can be welded and fixed to the two side beams 102 of the vehicle frame 1 respectively. In this application, the support beam 3 is a plate-shaped structure, and its large area provides a foundation for the installation of the load-bearing mechanism. In addition, the support beam 3 is provided with a vertically penetrating strip hole 303, which is used to cooperate with the movement of the connecting block 10 of the load-bearing mechanism and can play a certain guiding role.

[0038] The load-bearing mechanism is mounted on the support beam 3 and is used to position and support the vehicle's transfer frame. In this application, the load-bearing mechanism includes a rocker arm 5 and a first center pin 6 and a second center pin 7 arranged side by side; wherein, the rocker arm 5 can switch between a first position and a second position to selectively control the first center pin 6 or the second center pin 7 to move to the load-bearing position of the support beam 3, thereby meeting the needs of different vehicle models for rapid positioning and support, and improving versatility.

[0039] Specifically, in combination Figure 4 and Figure 5As shown, the supporting mechanism of this application also includes a movable plate 8, a rack 9, a connecting block 10, and a gear 11; wherein, the movable plate 8 is slidably disposed above the support beam 3, the rack 9 is slidably disposed below the support beam 3, the rack 9 is fixedly connected to the movable plate 8 through the connecting block 10 penetrating the support beam 3, the gear 11 is rotatably disposed below the support beam 3 and meshes with the rack 9, the rocker arm 5 is fixedly connected to the gear 11, and the first center pin 6 and the second center pin 7 are arranged side by side on the movable plate 8. In position control, the operator can drive the gear 11 to rotate through the rocker arm 5, thereby causing the rack 9 to move laterally to the left or right, and the rack 9 will drive the movable plate 8 to move synchronously through the connecting block 10 penetrating the strip hole 303, thereby selecting the first center pin 6 or the second center pin 7 to move to the bearing position of the support beam 3. Figure 1 For example, when the rocker arm 5 moves to the left to the first position, the first center pin 6 is located in the bearing position of the support beam 3. When the rocker arm 5 moves to the right to the second position, the second center pin 7 is located in the bearing position of the support beam 3.

[0040] It should be noted that the stability of movement of both the movable plate 8 and the rack 9 can be improved by adding a guide structure. The guide structure can be a groove or a slider. For example, a groove is provided on the lower end face of the support beam 3, and a slider (not shown) is provided on the rack 9.

[0041] In the sandblasting dummy trolley of this application, the first center pin 6 has a cylindrical structure with a mating groove 601 on its top. The first center pin 6 can be used with approximately 90% of the vehicles. The second center pin 7 has a columnar structure and corresponds to the remaining approximately 10% of vehicle models. In addition, the pad block 402 has three thicknesses: 80mm, 120mm, and 150mm. It can be used with the first center pin 6 or the second center pin 7 to accommodate different vehicle models, as detailed in the table below. In summary, this sandblasting dummy trolley integrates the first center pin 6 and the second center pin 7 into a single dummy trolley. Through rapid switching control via the rocker arm 5, the sandblasting dummy trolley can essentially cover the inspection needs of most rail vehicles on the market, exhibiting good versatility and significantly reducing maintenance costs. Furthermore, its enclosed frame design effectively prevents steel shot accumulation during the sandblasting process, reducing or even eliminating the increased steel shot procurement costs caused by loss during operation.

[0042] See Figure 2 As shown, in some embodiments, a plurality of vibrators 19 are provided at intervals on the inner top of the vehicle frame 1. The vibrators 19 can be wirelessly connected to the controller. After sandblasting is completed, the vibrators 19 can be turned on to shake off the steel shot remaining in hard-to-clean areas on the vehicle frame 1, ensuring that the vehicle frame 1 is clean and tidy and avoiding steel shot residue.

[0043] See Figure 3 As shown, recesses 4012 are provided on both sides of the receiving groove 4011 so that the operator can remove the existing pad 402 in the receiving groove 4011 and replace it with a pad 402 of other thickness, thereby adjusting the bearing height of the side bearing 4.

[0044] See Figure 4 As shown, in some embodiments, both the first center pin 6 and the second center pin 7 are circumferentially rotatable, which allows the first center pin 6 and the second center pin 7 to drive the vehicle to be inspected to rotate within a certain angle range, thereby achieving the function of cornering and facilitating vehicle transfer.

[0045] Furthermore, height adjusters 12 are provided between the first center pin 6 and the movable plate 8, and between the second center pin 7 and the movable plate 8. The height adjusters 12 can be manual hydraulic cylinders, used to adjust their respective vertical heights to ensure full contact with the vehicle and guarantee reliable docking. At the same time, by controlling the height difference between the first center pin 6 and the second center pin 7, interference and collision problems that may occur when the vehicle falls onto the sandblasting dummy trolley are avoided, and damage to the center pins or the vehicle body is prevented from affecting its use.

[0046] In some embodiments, the rocker arm 5 can lock with the support beam 3 at a first position and a second position respectively, thereby locking the first center pin 6 or the second center pin 7 at the bearing position of the support beam 3 to ensure the reliability and safety of its bearing.

[0047] Specifically, such as Figures 4 to 6 As shown, the bottom of the support beam 3 is provided with a first positioning hole 301 and a second positioning hole 302 respectively; wherein, the first positioning hole 301 corresponds to the rocker arm 5 moving to the first position, and the second positioning hole 302 corresponds to the rocker arm 5 moving to the second position. The front and rear sections of the rocker arm 5 are respectively provided with a positioning pin 13 and a button 14, which are connected into a whole structure by a connecting rod 15 built into the rocker arm 5, and a first spring 16 is provided in the middle of the connecting rod 15 to cooperate with the positioning pin 13 and the button 14. In the initial state, button 14 and positioning pin 13 are exposed on the surface of rocker arm 5 under the elastic force of the first spring 16. When the operator holds rocker arm 5, under pressure, button 14 drives positioning pin 13 to retract into rocker arm 5 through connecting rod 15, and the first spring 16 is compressed. After rocker arm 5 rotates to the first position or the second position, the operator releases the grip on rocker arm 5, the first spring 16 pushes connecting rod 15 to reset, and button 14 and positioning pin 13 are exposed from the surface of rocker arm 5 again. At this time, since the position of positioning pin 13 corresponds exactly to the first positioning hole 301 or the second positioning hole 302, the exposed positioning pin 13 can be inserted into it and form a lock, thereby restricting the movement of rocker arm 5 and ensuring that the position of the first center pin 6 or the second center pin 7 is fixed.

[0048] Furthermore, an extension rod 17 is provided on the side of button 14 away from connecting rod 15. The extension rod can be integrally formed with connecting rod 15, and a second spring 18 is provided on the extension rod 17, which is distributed side by side with the first spring 16. By lengthening the design and assisting the second spring 18 for support, the force on button 14 can be more even when it is operated, preventing the connecting rod 15 from wobbling and affecting the smooth extension and retraction of the positioning pin 13. In addition, the double spring design can also provide greater elasticity, ensuring that the positioning pin 13 is in tight contact with the first positioning hole 301 or the second positioning hole 302 during the locking process.

[0049] See Figure 1 As shown, in some embodiments, a traction ring 20 and a detachable wheel stop 21 are respectively provided on the left and right sides of the frame 1. For example, the traction ring 20 can be installed on the left beam 102 of the frame 1 for hoisting the sand-blasting dummy trolley. The wheel stop 21 can be placed on the right beam 102 of the frame 1 via a chain, connecting belt (not shown), or other connecting components. The wheel stop 21 can be a metal shoe, wooden wedge, etc. In use, the wheel stop 21 is inserted into the wheelset device 2 to restrict the movement of the sand-blasting dummy trolley.

[0050] In addition, anti-collision blocks 22 are provided at both the front and rear ends of the vehicle frame 1. The anti-collision blocks 22 can be rubber blocks, which are used to protect the vehicle frame 1.

[0051] The present invention also discloses a sandblasting process for changing platforms on railway passenger cars, which uses the aforementioned sandblasting dummy platform.

[0052] See Figure 7 As shown, a railway passenger car changing platform sandblasting process includes steps S1 to S6.

[0053] S1. Use a dummy trolley to move the vehicle to be inspected to the sand-making room changing area, and use a vehicle lifting machine to lift the vehicle on the dummy trolley. S2. Move the sand-blasting dummy trolley to the sand room changing area, select the first center pin 6 or the second center pin 7 according to the bogie model of the vehicle, and adjust the bearing height of the side bearing 4. S3. Slowly lower the vehicle so that it lands stably on the sandblasting dummy trolley, and then enter the sandblasting room; S4. After ensuring the safety of the vehicle and the sandblasting dummy trolley, carry out the sandblasting operation on the vehicle according to the process documents. S5. Remove the safety fixed position protection, use the sandblasting dummy trolley to move the sandblasted vehicle to the sandblasting room change area, and use the jacking machine to lift the vehicle on the sandblasting dummy trolley so that the running dummy trolley replaces the sandblasting dummy trolley. S6. Use a dummy trolley to move the vehicle to the next process, and then return the sandblasting dummy trolley to its original position.

[0054] Based on the above steps, it is clear that the sandblasting dummy trolley in this application does not participate in vehicle transfer work. It only moves between the initial position and the sandblasting room throughout the entire process; vehicle transfer is achieved using a separate operating dummy trolley. Compared to the conventional method of using only an operating dummy trolley to enter the sandblasting room, this application uses a specially designed sandblasting dummy trolley. Steel shot is less likely to accumulate on the sandblasting dummy trolley, and the sandblasting dummy trolley always operates only within the sandblasting room. This effectively avoids steel shot loss during transfer, significantly reducing steel shot consumption. Furthermore, after sandblasting is completed, transfer is still handled by the traditional operating dummy trolley. Since the operating dummy trolley does not come into contact with the sandblasting process, there is no steel shot spilling onto the track surface and its surroundings, thus preventing damage to the vehicle wheel treads after maintenance and ensuring the quality of vehicle maintenance.

[0055] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the invention without departing from the principles and spirit of the invention, and all such changes should fall within the protection scope of the claims of the present invention.

Claims

1. A sandblasting dummy trolley, comprising a frame (1), a wheelset device (2) disposed at the bottom of the frame (1), a support beam (3) disposed at the top of the frame (1), and a load-bearing mechanism disposed on the support beam (3); Its features are: The vehicle frame (1) is a closed frame, and each side of the vehicle frame (1) is provided with a side bearing (4), the bearing height of the side bearing (4) is adjustable; The bearing mechanism includes a rocker arm (5) and a first center pin (6) and a second center pin (7) arranged side by side; wherein the rocker arm (5) can switch between a first position and a second position to selectively control the first center pin (6) or the second center pin (7) to move to the bearing position of the support beam (3); The supporting mechanism further includes a movable plate (8), a rack (9), and a gear (11); wherein the movable plate (8) is slidably disposed above the support beam (3), the first center pin (6) and the second center pin (7) are arranged side by side on the movable plate (8), the rack (9) is slidably disposed below the support beam (3), the rack (9) is fixedly connected to the movable plate (8) through a connecting block (10) that passes through the support beam (3), the gear (11) is rotatably disposed below the support beam (3) and meshes with the rack (9), and the rocker arm (5) is fixedly connected to the gear (11).

2. The sandblasting dummy trolley according to claim 1, characterized in that, The vehicle frame (1) is a rectangular structure composed of two crossbeams (101) and two side beams (102); wherein the crossbeams (101) and the side beams (102) are hollow square steel made of weathering steel plates.

3. The sandblasting dummy trolley according to claim 2, characterized in that, The inner top of the vehicle frame (1) is provided with several vibrators (19).

4. The sandblasting dummy trolley according to claim 2, characterized in that, The side support (4) includes a support base (401) and a pad (402); wherein the support base (401) is fixed on the corresponding side beam (102), and the top of the support base (401) is provided with a receiving groove (4011), and the pad (402) can be replacedly placed in the receiving groove (4011).

5. The sandblasting dummy trolley according to claim 4, characterized in that, The receiving groove (4011) has notches (4012) on both sides.

6. The sandblasting dummy trolley according to claim 1, characterized in that, The first center pin (6) is a cylindrical structure with a mating groove (601) at its top, and the first center pin (6) can rotate circumferentially; the second center pin (7) is a columnar structure, and the second center pin (7) can rotate circumferentially.

7. The sandblasting dummy trolley according to claim 1, characterized in that, A height adjuster (12) is provided between the first center pin (6) and the movable plate (8) shown, and between the second center pin (7) and the movable plate (8) shown.

8. The sandblasting dummy trolley according to claim 1, characterized in that, The rocker arm (5) can lock with the support beam (3) in the first position and the second position respectively.

9. The sandblasting dummy trolley according to claim 8, characterized in that, The bottom of the support beam (3) is provided with a first positioning hole (301) and a second positioning hole (302). The rocker arm (5) is provided with a positioning pin (13) and a button (14) at its front and rear ends respectively. The positioning pin (13) and the button (14) are connected by a connecting rod (15) built into the rocker arm (5). A first spring (16) is provided in the middle of the connecting rod (15) to cooperate with the positioning pin (13) and the button (14). In the initial state, the button (14) and the positioning pin (13) are both exposed on the surface of the rocker arm (5), and the positioning pin (13) can form a lock with the first positioning hole (301) and the second positioning hole (302) respectively.

10. The sandblasting dummy trolley according to claim 9, characterized in that, An extension rod (17) is provided on the side of the button (14) away from the connecting rod (15), and a second spring (18) is provided on the extension rod (17). The second spring (18) is distributed side by side with the first spring (16).

11. The sandblasting dummy trolley according to claim 1, characterized in that, The vehicle frame (1) is provided with a traction ring (20) on the left and right sides and a detachable wheel stop (21) on the right and left sides respectively. The vehicle frame (1) is provided with anti-collision blocks (22) at both the front and rear ends.

12. A sandblasting process for changing platforms in railway passenger cars, characterized in that, The sandblasting dummy trolley as described in any one of claims 1-11 is used, comprising the following steps: S1. Use a dummy trolley to move the vehicle to be inspected to the sand-making room changing area, and use a vehicle lifting machine to lift the vehicle on the dummy trolley. S2. Move the sandblasting dummy trolley to the sandblasting room changing area, select the first center pin (6) or the second center pin (7) according to the bogie model of the vehicle, and adjust the bearing height of the side bearing (4); S3. Slowly lower the vehicle so that it lands stably on the sandblasting dummy trolley, and then enter the sandblasting room; S4. After ensuring the safety of the vehicle and the sandblasting dummy trolley, carry out the sandblasting operation on the vehicle according to the process documents. S5. Remove the safety fixed position protection, use the sandblasting dummy trolley to move the sandblasted vehicle to the sandblasting room change area, and use the jacking machine to lift the vehicle on the sandblasting dummy trolley so that the running dummy trolley replaces the sandblasting dummy trolley. S6. Use a dummy trolley to move the vehicle to the next process, and then return the sandblasting dummy trolley to its original position.

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