Interlayer carrier roller transportation and replacement device and replacement method thereof

By using the mezzanine roller transportation and replacement device on the unit mezzanine platform in the silicon steel Q518 area, the problems of difficulty in walking, risk of safety accidents and inefficiency during the roller replacement process are solved, and the automatic lifting and replacement of the rollers are realized, and construction efficiency and safety are improved.

CN120024833APending Publication Date: 2025-05-23SHANGHAI BAOSTEEL METALLURGICAL CONSTRUCTION CORP
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Patent Information

Application Number
CN202311562144.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-11-22
Publication Date
2025-05-23

AI Technical Summary

Technical Problem

On the unit mezzanine platform in the silicon steel Q518 area, there are problems such as people not being able to walk normally, time-consuming and labor-intensive and risk of safety accidents during the roller replacement process. At the same time, the existing technology requires three people to cooperate with the business, which is inefficient and has high labor costs.

Method used

A mezzanine roller transportation and replacement device is provided, including moving tracks, roller racks, lifting trolleys and reverse transport trolleys. Through the combined use of these devices, the automatic lifting and replacement of rollers is realized, reducing the need for manual handling.

Benefits of technology

It improves the construction efficiency and maintenance safety of roller replacement, reduces the time and labor cost of manual handling, and reduces safety risks during construction.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to the technical field of special equipment repair, in particular to an interlayer carrier roller transporting and replacing device and an interlayer carrier roller replacing method thereof. The interlayer carrier roller transporting and replacing device comprises a moving rail, a roller material frame, a hoisting trolley and a reshipment trolley, the moving rail linearly extends in the arrangement direction of carrier rollers on a unit interlayer of a silicon steel Q518 area, and the hoisting trolley can be arranged on the moving rail in a reciprocating motion mode. The side, perpendicular to the moving track direction, of the lifting trolley is detachably connected with the side, in the moving direction, of the reshipment trolley into a whole, the material frame track on the lifting trolley is communicated with the material frame track on the reshipment trolley, and the roller material frame can be arranged on the material frame track in a reciprocating motion mode. The replacement device can improve the replacement construction efficiency and the maintenance safety.
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Description

Technical Field

[0001] The invention relates to the technical field of special equipment repair, and in particular to a sandwich roller transport and replacement device, and a sandwich roller replacement method using the replacement device. Background Art

[0002] The mezzanine of the unit in the silicon steel Q518 area is 260 meters long and is equipped with 129 rollers with a total weight of about 60kg. When the rollers in the silicon steel Q518 area need to be replaced, a crane is used to lift the new rollers to the mezzanine platform channel, and then the new rollers are lifted to the replacement point by manpower for roller replacement.

[0003] However, the silicon steel Q518 area needs regular inspection and maintenance every two months, and about 10 rollers need to be replaced during each maintenance. The mezzanine platform channel is located next to the rear cleaning section, the distance between the channel and the farthest roller is about 200 meters, and the height of the mezzanine part is about 1.2 meters. During the construction process, personnel cannot walk normally, which is not only time-consuming and labor-intensive, but may also cause safety accidents such as heavy objects falling on them.

[0004] At the same time, three people are required to cooperate in replacing a roller. In order to improve the inspection and maintenance efficiency of rollers during the regular maintenance stage, six people are often required to work together. After completing the replacement of about 10 rollers, it often takes 2.5 hours, which has high labor costs and low work efficiency. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a sandwich roller transportation and replacement device which can improve the replacement construction efficiency and maintenance safety.

[0006] The present invention adopts the following technical solution:

[0007] The present invention provides a sandwich roller transport and replacement device, comprising a moving track, a roller rack, a lifting trolley and a reverse transport trolley, the moving track extends linearly along the arrangement direction of the rollers on the unit interlayer in the silicon steel Q518 area, the lifting trolley can be reciprocatingly arranged on the moving track, one side of the lifting trolley perpendicular to the direction of the moving track and the side of the moving direction of the reverse transport trolley can be detachably connected as a whole, the rack track on the lifting trolley is connected to the rack track on the reverse transport trolley, and the roller rack can be reciprocatingly arranged on the rack track.

[0008] Preferably, the movable track includes two parallel extension belts arranged at intervals, all the rollers on the lifting trolley and the unit interlayer are located in the interval space between the two extension belts, the lifting trolley is located on the top of the rollers and keeps a distance from the rollers, and the running wheels on the lifting trolley can be reciprocatingly rolled on the two extension belts.

[0009] Preferably, the rack track includes two round rods arranged in parallel and at intervals, and the roller rack includes a frame base plate of a rectangular structure. Vertical columns are respectively fixed at the four corners of the top surface of the frame base plate. Fixed pulleys are installed on the opposite sides of two adjacent columns along the width direction of the frame base plate. The fixed pulleys are set on the round rods and can roll back and forth along the round rods, and the frame base plate remains suspended.

[0010] Preferably, along the width direction of the frame bottom plate, support rods are extended obliquely toward the top on the opposite sides of two adjacent columns, and each column has multiple support rods arranged in parallel and at equal intervals from the bottom to the top, and the spacing distance between two adjacent support rods on each column is greater than the diameter of the roller.

[0011] Preferably, the outer surface of the support rod is covered with a flexible material layer.

[0012] Preferably, a hook is installed on the column at the position of the fixed pulley.

[0013] Preferably, a single-arm crane is installed on the top of the lifting trolley, the crossbeam of the single-arm crane extends straight along the direction of the moving track, and the positive projection of the end of the crossbeam on the lifting trolley exceeds the lifting trolley, the electric hoist hook on the crossbeam is hung with a supporting hook for balancing the supporting rollers, and the material rack track is arranged at intervals directly below the crossbeam.

[0014] Preferably, a driving motor, a battery and a running wheel are provided at the bottom of the lifting trolley, the driving motor is connected to the battery, and the driving motor drives the running wheel to rotate.

[0015] Preferably, the bottom of the inverting trolley is provided with running wheels.

[0016] The present invention also provides a method for replacing an interlayer roller, which uses the interlayer roller transport and replacement device and includes the following steps:

[0017] S1: Move the inverted trolley loaded with roller racks to the mezzanine platform channel, and hoist new rollers into the roller racks by crane;

[0018] S2: Move the reverse transport trolley to the position of the lifting trolley, connect the rack track on the lifting trolley with the rack track on the reverse transport trolley, move the roller rack carrying the new roller into the lifting trolley, and then release the connection between the lifting trolley and the reverse transport trolley;

[0019] S3: Move the lifting trolley along the moving track to the position where the roller is to be replaced, manually remove the pressure plate bolts of the old roller, lift the old roller by the lifting trolley and put it into the roller rack, then lift the new roller in the roller rack by the lifting trolley and put it into the roller slot, and finally manually reinstall the pressure plate bolts;

[0020] S4: Continue to move the lifting trolley to the next roller to be replaced, and repeat step S3 until all rollers on the unit interlayer in the silicon steel Q518 area are overhauled;

[0021] S5: Move the lifting trolley to the position of the reverse trolley, connect the rack track on the lifting trolley with the rack track on the reverse trolley, move the roller rack carrying the old rollers into the reverse trolley, and then disconnect the lifting trolley from the reverse trolley;

[0022] S6: Move the reverse transport trolley to the mezzanine platform passage, and use the crane to lift the old roller to the spare parts storage point, and finally put the lifting trolley and the reverse transport trolley back to their original positions.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The sandwich roller transport and replacement device of the present invention can realize the storage of new rollers by cooperating with the inverting trolley loaded with roller racks and the traveling crane, and realize the transportation of the roller racks together with new rollers by connecting the inverting trolley with the lifting trolley, and then realize the purpose of lifting out the old rollers or lifting the new rollers into the roller slots by moving the lifting trolley along the moving track. Compared with the manual handling form of three people cooperating, the sandwich roller transport and replacement device of the present invention can obviously improve the replacement construction efficiency and maintenance safety.

[0025] The sandwich roller replacement method of the present invention naturally has the above-mentioned beneficial effects due to the use of the above-mentioned replacement device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the interlayer roller transport and replacement device in an embodiment of the present invention.

[0027] Figure 2 It is a schematic diagram of the structure of the moving track on the interlayer roller transport and replacement device in an embodiment of the present invention.

[0028] Figure 3 It is a schematic structural diagram of a roller rack on a sandwich roller transport and replacement device in an embodiment of the present invention.

[0029] Figure 4 It is a schematic structural diagram of a hoisting trolley on a sandwich roller transport and replacement device in an embodiment of the present invention.

[0030] Figure 5 It is a schematic structural diagram of a reverse transport trolley on a sandwich roller transport and replacement device in an embodiment of the present invention.

[0031] The reference numerals are described as follows:

[0032] 1. Mobile track 31. Single-arm crane

[0033] 11. Extension belt 311, crossbeam

[0034] 2. Roller rack 312, electric hoist

[0035] 21. Frame bottom plate 313, support hook

[0036] 22. Column 32. Drive motor

[0037] 23. Fixed pulley 4. Reverse transport trolley

[0038] 24. Support rod 5, rack track

[0039] 25. Hook 51. Round rod

[0040] 3. Lifting trolley DETAILED DESCRIPTION

[0041] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0042] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0045] See also Figure 1The present embodiment provides a sandwich roller transport and replacement device, comprising a movable track 1, a roller rack 2, a lifting trolley 3 and a reverse trolley 4, the movable track 1 extends straightly along the arrangement direction of the rollers on the unit interlayer in the silicon steel Q518 area, the lifting trolley 3 can be reciprocatingly arranged on the movable track 1, the side of the lifting trolley 3 perpendicular to the direction of the movable track 1 and the side of the moving direction of the reverse trolley 4 can be detachably connected as a whole, the rack track 5 on the lifting trolley 3 is connected to the rack track 5 on the reverse trolley 4, and the roller rack 2 can be reciprocatingly arranged on the rack track 5.

[0046] The sandwich roller transport and replacement device of this embodiment can achieve storage of new rollers by cooperating with the inverting trolley 4 loaded with roller racks 2 and the crane, that is, the new rollers are hoisted into the roller racks 2 of the inverting trolley 4 by the crane, and the roller racks 2 together with the new rollers are transported by connecting the inverting trolley 4 with the lifting trolley 3, that is, after connecting the inverting trolley 4 with the lifting trolley 3, the roller racks 2 carrying new rollers are moved to the lifting trolley 3 through the connected rack track 5, and then the old rollers are hoisted out or the new rollers are hoisted into the roller slots by moving the lifting trolley 3 along the moving track 1. Compared with the manual handling form of three people working together, the sandwich roller transport and replacement device of this embodiment can obviously improve the replacement construction efficiency and maintenance safety.

[0047] Preferably, in this embodiment, a latch is provided on the roller rack 2, and an access slot that can be plugged and matched with the latch is provided on the lifting trolley 3 and the inverting trolley 4. The provision of the latch and the access slot allows the roller rack 2 and the inverting trolley 4 to be connected as a whole through the latch, so that it is convenient for the vehicle to hoist the roller rack 2 and the inverting trolley 4 as a whole to the interlayer platform at the maintenance position; at the same time, it can also ensure the stability of the roller rack 2 when the lifting trolley 3 or the inverting trolley 4 moves after the roller rack 2 is moved onto the lifting trolley 3 or the inverting trolley 4.

[0048] Preferably, see Figure 1 and Figure 2 The movable track 1 includes two parallel extension belts 11 arranged at intervals. The lifting trolley 3 and all the rollers on the unit interlayer are located in the interval space between the two extension belts. The lifting trolley 3 is located on the top of the rollers and keeps a distance from the rollers, and the running wheels on the lifting trolley 3 can be reciprocatingly rolled on the two extension belts 11.

[0049] When replacing the rollers on the interlayer of the unit, the accompanying maintenance personnel are required to remove the pressure plate bolts on the rollers, and the two extension belts 11 of the movable rail 1 are respectively set on both sides of the rollers arranged in a straight line on the interlayer of the unit, and the lifting trolley 3 is located on the top of the rollers and keeps a distance from the rollers, which can reduce the space occupied by the interlayer roller transportation and replacement device of this embodiment on the interlayer platform, which is conducive to the convenient construction of the maintenance personnel.

[0050] Preferably, see Figures 3 to 5 The material rack track 5 includes two parallel round rods 51 arranged at intervals, and the roller material rack 2 includes a frame bottom plate 21 of a rectangular structure. Four corners of the top surface of the frame bottom plate 21 are vertically fixed with columns 22. Along the width direction of the frame bottom plate 21, fixed pulleys 23 are installed on the opposite sides of two adjacent columns 22. The fixed pulley 23 can be set on the round rod 51 and can roll back and forth along the round rod 51, and the frame bottom plate 21 remains in a suspended state, so that after the lifting trolley 3 and the inverting trolley 4 are detachably connected as one, the accompanying maintenance personnel can push the roller material rack 2 to transfer between the lifting trolley 3 and the inverting trolley 4 with less effort.

[0051] Preferably, see Figure 3 Along the width direction of the frame bottom plate 21, a supporting rod 24 is extended obliquely toward the top on the opposite sides of two adjacent columns 22, and each column 22 is provided with a plurality of supporting rods 24 arranged in parallel and at equal intervals from the bottom to the top, and the interval between two adjacent supporting rods 24 on each column 22 is greater than the diameter of the roller. When placing the roller on the roller rack 2, it can be pushed in a straight line along the length direction of the frame bottom plate 21, and the two ends of the roller are pressed on the supporting rods 24 of the two columns 22, so as to facilitate the orderly placement of the rollers.

[0052] Preferably, the outer surface of the supporting rod 24 is covered with a flexible material layer to prevent the roller surface of the supporting roller from being damaged.

[0053] Preferably, see Figure 3 The column 22 is provided with a hook 25 at the position of the fixed pulley 23 to facilitate the lifting of the roller rack 2 by the crane.

[0054] Preferably, see Figure 1 and Figure 4 A single-arm crane 31 is installed on the top of the lifting trolley 3. The crossbeam 311 of the single-arm crane 31 extends straight along the direction of the moving track 1, and the positive projection of the end of the crossbeam 311 on the lifting trolley 3 exceeds the lifting trolley 3. The electric hoist 312 on the crossbeam 311 is hooked with a supporting hook 313 for balancing the supporting rollers, and the rack track 5 is arranged at intervals directly below the crossbeam 311.

[0055] During operation, the lifting trolley 3 can move the electric hoist 312 on the beam 311 and lower the supporting hook 313 of the electric hoist 312 to hook the rollers on the roller rack 2; and after moving the electric hoist 312 to the end of the beam 311, the supporting hook 313 of the electric hoist 312 is lowered, so that the rollers on the interlayer of the unit can be hooked, thereby realizing the replacement of the interlayer rollers.

[0056] Preferably, see Figure 4A driving motor 32 , a battery and a running wheel are provided at the bottom of the lifting trolley 3 . The driving motor 32 is connected to the battery, and the driving motor 32 drives the running wheel to rotate, thereby realizing the electric drive of the lifting trolley 3 .

[0057] Preferably, the bottom of the inverting trolley 4 is provided with running wheels to facilitate manual pushing.

[0058] This embodiment also provides a sandwich roller replacement method, which uses the above-mentioned sandwich roller transportation and replacement device and includes the following steps: Figures 1 to 5 :

[0059] S1: Move the inverting trolley 4 loaded with the roller rack 2 to the mezzanine platform channel, and hoist the new rollers into the roller rack 2 by the crane;

[0060] S2: Move the inverted trolley 4 to the position of the lifting trolley 3, connect the rack track 5 on the lifting trolley 3 with the rack track 5 on the inverted trolley 4, move the roller rack 2 carrying the new roller into the lifting trolley 3, and then release the connection between the lifting trolley 3 and the inverted trolley 4;

[0061] S3: Move the lifting trolley 3 along the moving track 1 to the position where the roller is to be replaced, manually remove the pressure plate bolts of the old roller, and lift the old roller by the lifting trolley 3 and put it into the roller rack 2, then lift the new roller in the roller rack 2 by the lifting trolley 3 and put it into the roller slot, and finally manually reinstall the pressure plate bolts;

[0062] S4: Continue to move the lifting trolley 3 to the next roller to be replaced, and repeat step S3 until all rollers on the unit interlayer in the silicon steel Q518 area are overhauled;

[0063] S5: Move the lifting trolley 3 to the position of the inverting trolley 4, connect the rack track 5 on the lifting trolley 3 with the rack track 5 on the inverting trolley 4, move the roller rack 2 carrying the old rollers into the inverting trolley 4, and then release the connection between the lifting trolley 3 and the inverting trolley 4;

[0064] S6: Move the inverted trolley 4 to the mezzanine platform passage, and hoist the old roller to the spare parts storage point by the crane, and finally put the hoisting trolley 3 and the inverted trolley 4 back to their original positions.

[0065] The interlayer roller replacement method of the present embodiment can replace the rollers by using the above-mentioned interlayer roller transportation and replacement device, so that the rollers are lifted into and out of the roller slots by the lifting trolley 3, thereby avoiding the lifting method of personnel in the original method, and can effectively reduce the damage to the roller surface caused by improper cooperation, thereby reducing the construction safety risk and quality risk; in addition, the coordinated use of the lifting trolley 3 and the inverting trolley 4 can realize the inverting of the rollers between the placement point and the construction point, so as to facilitate the continuous progress of the roller replacement operation, thereby improving the construction efficiency of the roller replacement.

[0066] Meanwhile, the structure of the hoisting trolley 3 in this method is simple and reliable, and it can be popularized in similar roller replacement projects, which has great significance in improving the labor efficiency of corresponding roller replacement, reducing personnel input and consumption, and ensuring the quality and safety of project implementation. Therefore, the prospect of popularization and application is also very good.

[0067] It should be noted that in order to ensure the accurate implementation of the above-mentioned method for replacing the intermediate layer rollers, before the formal construction, it is necessary to conduct a function check on the intermediate layer roller transportation and replacement device. Only when it is ensured that all functions of the intermediate layer roller transportation and replacement device are normal can the implementation begin.

[0068] The above-mentioned intermediate layer roller transportation and replacement device and the method for replacing the intermediate layer rollers have been applied many times in the project of replacing the horizontal loop rollers of silicon steel, and the effect is good.

[0069] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A sandwich roller transport and replacement device, It is characterized in that The invention comprises a movable track (1), a roller material rack (2), a lifting trolley (3) and a reverse transport trolley (4); the movable track (1) extends in a straight line along the arrangement direction of the rollers on the interlayer of the unit in the silicon steel Q518 region; the lifting trolley (3) is reciprocatably arranged on the movable track (1); a side of the lifting trolley (3) perpendicular to the direction of the movable track (1) and a side of the reverse transport trolley (4) in the moving direction are detachably connected as a whole; the material rack track (5) on the lifting trolley (3) is connected to the material rack track (5) on the reverse transport trolley (4); and the roller material rack (2) is reciprocatably arranged on the material rack track (5).

2. The sandwich roller transport and replacement device according to claim 1, It is characterized in that The movable track (1) comprises two parallel extension belts (11) arranged at intervals, the lifting trolley (3) and all the rollers on the interlayer of the unit are located in the interval space between the two extension belts (11), the lifting trolley (3) is located on the top of the rollers and maintains a spacing with the rollers, and the running wheels on the lifting trolley (3) can be reciprocatingly rolled on the two extension belts (11).

3. The sandwich roller transport and replacement device according to claim 1, It is characterized in that The material rack track (5) comprises two round rods (51) arranged in parallel and at intervals, and the roller material rack (2) comprises a frame bottom plate (21) of a rectangular structure, and vertical columns (22) are respectively fixed at the four corners of the top surface of the frame bottom plate (21), and fixed pulleys (23) are installed on the opposite sides of two adjacent columns (22) along the width direction of the frame bottom plate (21), and the fixed pulleys (23) are arranged on the round rods (51) so as to roll back and forth along the round rods (51), and the frame bottom plate (21) remains in a suspended state.

4. The sandwich roller transport and replacement device according to claim 3, It is characterized in that Along the width direction of the frame bottom plate (21), a support rod (24) is extended obliquely toward the top on the opposite sides of two adjacent columns (22), and each column (22) is provided with a plurality of support rods (24) arranged in parallel and at equal intervals from the bottom to the top, and the spacing distance between two adjacent support rods (24) on each column (22) is greater than the diameter of the roller.

5. The sandwich roller transport and replacement device according to claim 4, It is characterized in that The outer surface of the support rod (24) is covered with a flexible material layer.

6. The sandwich roller transport and replacement device according to claim 3, It is characterized in that The upright post (22) is provided with a hook (25) at the position of the fixed pulley (23).

7. The sandwich roller transport and replacement device according to claim 1, It is characterized in that A single-arm crane (31) is installed on the top of the lifting trolley (3); a crossbeam (311) of the single-arm crane (31) extends in a straight line along the direction of the moving track (1); and the orthographic projection of the end of the crossbeam (311) on the lifting trolley (3) exceeds the lifting trolley (3); an electric hoist (312) on the crossbeam (311) is hooked with a supporting hook (313) for balancing supporting rollers; and the rack track (5) is arranged at intervals directly below the crossbeam (311).

8. The sandwich roller transport and replacement device according to claim 7, It is characterized in that A driving motor (32), a battery and running wheels are provided at the bottom of the lifting trolley (3); the driving motor (32) is connected to the battery, and the driving motor (32) drives the running wheels to rotate.

9. The sandwich roller transport and replacement device according to claim 1, It is characterized in that The bottom of the inverted transport trolley (4) is provided with running wheels.

10. A method for replacing sandwich rollers, It is characterized in that The sandwich roller transport and replacement device according to any one of claims 1 to 9 is used, and comprises the following steps: S1: Move the transfer trolley (4) loaded with the roller rack (2) to the mezzanine platform channel, and hoist new rollers by means of a crane and place them into the roller rack (2); S2: Move the inverted transport trolley (4) to the position of the lifting trolley (3), connect the rack track (5) on the lifting trolley (3) and the rack track (5) on the inverted transport trolley (4), move the roller rack (2) carrying the new roller into the lifting trolley (3), and then release the connection between the lifting trolley (3) and the inverted transport trolley (4); S3: Move the lifting trolley (3) along the moving track (1) to the position of the roller to be replaced, manually remove the pressure plate bolts of the old roller, and lift the old roller by the lifting trolley (3) and put it into the roller rack (2), then lift the new roller in the roller rack (2) by the lifting trolley (3) and put it into the roller slot, and finally manually reinstall the pressure plate bolts; S4: Continue to move the lifting trolley (3) to the next roller to be replaced, and repeat step S3 until all rollers on the unit interlayer in the silicon steel Q518 area are overhauled; S5: Move the lifting trolley (3) to the position of the inverting trolley (4), connect the rack track (5) on the lifting trolley (3) and the rack track (5) on the inverting trolley (4), move the roller rack (2) carrying the old rollers into the inverting trolley (4), and then release the connection between the lifting trolley (3) and the inverting trolley (4); S6: Move the inverted transport trolley (4) to the mezzanine platform passage, and hoist the old roller to the spare parts storage point by means of a crane, and finally put the hoisting trolley (3) and the inverted transport trolley (4) back to their original positions.