Quick replacement system and method for main transmission connecting shaft of rolling mill

Abstract

The invention discloses a quick replacement system and method for a main transmission connecting shaft of a rolling mill, belongs to the field of replacement of rolling mill parts, and aims to improve the replacement efficiency of a lower connecting shaft. Comprising rolling mill working roll changing equipment, a transmission side roll way, a rolling mill inner roll way and a translation trolley, the transmission side roller way, the rolling mill inner roller way, the operation side roller way and the working roll changing roller way form a passage for the translation trolley to translate along the center line of the rolling mill; the translation trolley is movably arranged on the passage; the translation trolley is detachably connected with the travelling crane or the working roll changing trolley, the translation trolley is dragged by the travelling crane to move from the operation side of the rolling mill to the transmission side, and the translation trolley is dragged by the working roll changing trolley to move from the transmission side of the rolling mill to the operation side, so that the main transmission lower connecting shaft of the rolling mill can move between the transmission side and the operation side of the rolling mill; therefore, the function of directly replacing the lower connecting shaft without dismounting the upper connecting shaft is achieved, the replacement process of the lower connecting shaft is optimized, the replacement efficiency of the lower connecting shaft is greatly improved, the equipment maintenance time is shortened, and the production efficiency of a rolling mill is improved.

Description

Technical Field

[0001] This invention belongs to the field of rolling mill component replacement technology, specifically relating to a quick replacement system and method for the main drive shaft of a rolling mill. Background Technology

[0002] The main drive shaft of a rolling mill is a critical core component of the rolling mill equipment. It connects to the rolls to transmit the motion and torque of the motor, and withstands the impact loads during steel biting and throwing. Operating under harsh conditions and limited by the dimensions of the work rolls, it is a weak link in the rolling mill equipment, requiring frequent maintenance. Because the main drive shaft is arranged vertically, the current method for replacing it involves using a crane to lift and replace both the upper and lower shafts. Therefore, replacing the lower shaft necessitates disassembling and reassembling the upper shaft simultaneously, resulting in a large workload and long replacement time. This severely impacts the mill's production efficiency and output. For example, a hot strip mill line experienced a 3%-5% reduction in planned monthly output due to downtime for shaft replacement. The lower connecting shaft of the main drive of the rolling mill experiences greater load and impact vibration compared to the upper connecting shaft, and the operating conditions, such as cooling water and impurities, are more severe, resulting in a higher failure rate. With the continuous improvement of the production efficiency and output of rolling mill equipment, there is an urgent need to invent a quick replacement system and method for the main drive connecting shaft of the rolling mill. When the lower connecting shaft suddenly fails, it is not necessary to disassemble the upper connecting shaft; the lower connecting shaft can be replaced separately, achieving quick replacement of the lower connecting shaft, shortening unplanned downtime for maintenance, and significantly reducing the economic losses caused by sudden accidents to the rolling line. Summary of the Invention

[0003] The purpose of this invention is to solve the problem of low efficiency in replacing the lower shaft by direct lifting, and to provide a quick replacement system and method for the main drive shaft of a rolling mill, thereby improving the replacement efficiency of the lower shaft.

[0004] The technical solution adopted in this invention is: a quick replacement system for the main drive shaft of a rolling mill, including a rolling mill work roll changing device, a drive-side roller table, an inner roller table of the rolling mill, and a translating trolley; the rolling mill work roll changing device includes an operating-side roller table, a work roll changing roller table, a work roll changing trolley, and a traveling crane; the drive-side roller table, the inner roller table of the rolling mill, the operating-side roller table, and the work roll changing roller table form a passage for the translating trolley to move along the center line of the rolling mill; the translating trolley is movably disposed on the passage, and when the translating trolley moves to the drive-side roller table, the height position of the translating trolley is lower than the height position of the lower shaft; the translating trolley is detachably connected to the traveling crane or the work roll changing trolley, and the translating trolley moves from the operating side to the drive side of the rolling mill by being pulled by the traveling crane, and moves from the drive side to the operating side of the rolling mill by being pulled by the work roll changing trolley.

[0005] Furthermore, the translation trolley includes a frame, with a support block on the top of the frame for supporting the lower shaft, and sliders on both sides of the bottom of the frame that slide in cooperation with the passage.

[0006] Furthermore, the slider on one side of the bottom of the frame is a concave slider with a concave bottom surface, and a convex slide plate with a raised top surface is provided on the top of the transmission side roller conveyor. The concave slider cooperates with the convex slide plate. The slider on the other side of the bottom of the frame is a smooth block with a flat top surface, and a smooth plate with a flat top surface is provided on the top of the transmission side roller conveyor. The smooth block cooperates with the smooth plate.

[0007] Furthermore, two pairs of fixing lugs for tying ropes are provided longitudinally on the top of the frame, with two fixing lugs in each pair located on either side of the axle placement area.

[0008] Furthermore, the frame of the translation trolley is provided with traction lugs at both ends along the longitudinal direction.

[0009] Furthermore, a pulley mechanism is provided at the end of the transmission side roller table opposite to the inner roller table of the rolling mill. The lifting rope connected to the trolley is turned by the pulley mechanism and then connected to the traction lug of the translation trolley.

[0010] Furthermore, the transmission side roller conveyor includes a base and a roller conveyor body; the base is installed on the workshop foundation; the roller conveyor body is installed on top of the base, and an adjusting bolt is provided between the roller conveyor body and the base, through which the elevation of the base is adjusted.

[0011] A quick replacement method for the main drive shaft of a rolling mill includes the following steps:

[0012] Step 1: After using the overhead crane to remove the mill work rolls, the overhead crane will lift the translation trolley onto the mill work roll changing roller table. Then, the overhead crane will move to the mill drive side. The lifting rope will pass through the pulley block on the pulley mechanism, with one end fixed to the traction lug of the translation trolley and the other end fixed to the lifting hook of the overhead crane. The overhead crane will then drag the translation trolley to the lower connecting shaft on the mill drive side. Finally, the overhead crane will lift the lower connecting shaft and place it on the support block of the translation trolley.

[0013] Step 2: Fix one end of the traction rope to the traction lug of the translation trolley and the other end to the traction head of the working roller changing trolley. Use the working roller changing trolley to drag the translation trolley carrying the lower connecting shaft to the working roller changing track. After removing the traction rope and the connecting shaft fixing rope, use the crane to lift the lower connecting shaft away.

[0014] Step 3: The overhead crane lifts the new lower shaft, places it on the translation trolley and secures it with ropes. Then, the overhead crane moves to the mill drive side. The lifting rope passes through the pulley block, with one end fixed to the traction lug of the translation trolley and the other end fixed to the lifting hook of the overhead crane. The overhead crane drags the translation trolley to the mill drive side, loosens the shaft fixing rope, and the overhead crane lifts the new lower shaft and installs it onto the main drive equipment.

[0015] Step 4: Fix one end of the traction rope to the traction lug of the translation trolley and the other end to the traction head of the work roll changing trolley. Use the work roll changing trolley to drag the translation trolley onto the work roll changing roller track.

[0016] The beneficial effects of this invention are as follows: This invention combines a translation trolley with a rolling mill work roll changing device. The traveling trolley and the work roll changing trolley drag the translation trolley carrying the rolling mill main drive lower shaft on the drive-side roller table, the rolling mill inner roller table, and the work roll changing roller table. This allows the rolling mill main drive lower shaft to move between the rolling mill drive side and the operating side, thereby achieving the function of directly replacing the lower shaft without disassembling the upper shaft. This optimizes the lower shaft replacement process, significantly improves the lower shaft replacement efficiency, shortens equipment maintenance time, and increases rolling mill production efficiency.

[0017] In the entire system, the traveling trolley, the work roll changing trolley, and the work roll changing roller table are all work roll changing equipment of the rolling mill itself. Only the translation trolley and the drive side roller table need to be added on the basis of this. It makes full use of the existing structure, combines the existing structure, has a simple structure, has little impact on the existing structure, does not occupy extra space, and has lower manufacturing and maintenance costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the quick-change system for the main drive shaft of a rolling mill disclosed in this invention;

[0019] Figure 2 A schematic diagram of the translation trolley assembly;

[0020] Figure 3 A schematic diagram showing the translation trolley being pulled from the operating side to the transmission side;

[0021] Figure 4 This is a schematic diagram showing the old lower connector shaft after it has been pulled out.

[0022] Figure 5 A schematic diagram showing the new lower shaft being pulled in via a translation trolley;

[0023] Figure 6 This is a schematic diagram showing the translation trolley after it has been pulled out.

[0024] In the diagram, the components are: pulley mechanism 1, translation trolley 2, concave slider 21, support block 22, frame 23, fixed lifting lug 24, traction lifting lug 26, smoothing block 25, transmission side roller conveyor 3, base seat 31, roller conveyor body 32, adjusting bolt 33, convex slide plate 34, smoothing plate 35, baffle 36, mill inner roller conveyor 4, operating side roller conveyor 5, work roll changing roller conveyor 6, work roll changing trolley 7, traction rope 8, lifting rope 9, traveling crane 10, lower connecting shaft 100, and upper connecting shaft 200. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0026] Quick-change system for main drive shaft of rolling mill, such as Figure 1 As shown, the system includes a rolling mill work roll changing device, a drive-side roller conveyor 3, an inner rolling mill roller conveyor 4, and a translation trolley 2. The rolling mill work roll changing device is used to replace the rolling mill work rolls and is a commonly used existing device. It includes an operating-side roller conveyor 5, a work roll changing roller conveyor 6, a work roll changing trolley 7, and a traveling crane 10. The work roll changing roller conveyor 6 and the operating-side roller conveyor 5 are located on the operating side of the rolling mill, with the operating-side roller conveyor 5 situated between the work roll changing roller conveyor 6 and the inner rolling mill roller conveyor 4. The work roll changing trolley 7 is located on the side of the work roll changing roller conveyor 6 opposite to the rolling mill. The drive-side roller conveyor 3, the inner rolling mill roller conveyor 4, the operating-side roller conveyor 5, and the work roll changing roller conveyor 6 form a path for the translation trolley 2 to move along the centerline of the rolling mill. The translation trolley 2 is movably mounted on this path. When the translation trolley 2 moves onto the drive-side roller conveyor 3, its height is lower than that of the lower connecting shaft 100. The operating side roller conveyor 5 connects the inner roller conveyor 4 of the mill and the work roll changing roller conveyor 6. The drive side roller conveyor 3 is connected to the drive side end of the inner roller conveyor 4 of the mill and extends to the lower connecting shaft 100. Thus, when the translation trolley 2 is on the drive side roller conveyor 3, after the old lower connecting shaft 100 is unloaded onto the translation trolley 2, the old lower connecting shaft 100 is transported along the drive side roller conveyor 3 → inner roller conveyor 4 → operating side roller conveyor 5 → work roll changing roller conveyor 6 to the work roll changing roller conveyor 6 and then lifted away. When the translation trolley 2 is on the work roll changing roller conveyor 6, after the new lower connecting shaft 100 is placed on the translation trolley 2, the new lower connecting shaft 100 is transported along the work roll changing roller conveyor 6 → operating side roller conveyor 5 → inner roller conveyor 4 → drive side roller conveyor 3 to the drive side roller conveyor 3, where the new lower connecting shaft 100 can be installed on the main drive equipment. The translation trolley 2 is detachably connected to the traveling trolley 10 or the work roll changing trolley 7. The traveling trolley 10 pulls the translation trolley 2 from the mill's operating side to the drive side, and the work roll changing trolley 7 pulls the translation trolley 2 from the mill's drive side to the operating side. The movement from the mill's drive side to the operating side refers to movement along the path of drive side roller table 3 → mill inner roller table 4 → operating side roller table 5 → work roll changing roller table 6; the movement from the mill's operating side to the drive side refers to movement along the path of work roll changing roller table 6 → operating side roller table 5 → mill inner roller table 4 → drive side roller table 3. When the translation trolley 2 needs to move from the mill's operating side to the drive side, a lifting rope 9 is used, with one end connected to the hook of the traveling trolley 10, and the other end looping around the pulley block to a horizontal position before connecting to the translation trolley 2. When the translation trolley 2 needs to move from the mill drive side to the operating side, disconnect the connection between the traveling trolley 10 and the translation trolley 2, and connect one end of the traction rope 8 to the work roll changing trolley 7 and the other end to the translation trolley 2.

[0027] This quick-change system for the main drive shaft of the rolling mill utilizes a traveling crane 10 and a work roll changing trolley 7 to drive a translation trolley 2, allowing the lower shaft 100 to move between the drive side and the operating side of the rolling mill. This enables direct replacement of the lower shaft 100 without disassembling the upper shaft 200, optimizing the replacement process, significantly improving the replacement efficiency, shortening equipment maintenance time, and increasing rolling mill production efficiency. Furthermore, it benefits from the existing work roll changing equipment, such as the traveling crane, the changing trolley, and the work roll changing conveyor, requiring only the additional translation trolley and drive-side conveyor 3. The translation trolley only serves as a support for the lower shaft 100 and does not participate in lifting it, fully utilizing the existing structure. The system is simple to modify, does not occupy additional space, and has lower manufacturing and maintenance costs.

[0028] The main drive shaft of the hot rolling mill has a large diameter and is heavy. The overhead crane 10 can better adapt to the hoisting of the main drive shaft of the hot rolling mill, as well as the pulling of the translation trolley 2.

[0029] Among them, such as Figure 2 As shown, the translation trolley 2 includes a frame 23. A support block 22 for supporting the lower connecting shaft 100 is provided on the top of the frame 23. Slider blocks that slide in conjunction with the passage are respectively provided on both sides of the bottom of the frame 23. The sliders can take various forms, such as dovetail shapes. In this embodiment, the slider on one side of the bottom of the frame 23 is a concave slider 21 with a concave bottom surface. A convex slide plate 34 with a raised top surface is provided on the top of the transmission side roller conveyor 3, and the concave slider cooperates with the convex slide plate 34. The slider on the other side of the bottom of the frame 23 is a smooth block 25 with a flat top surface. A smooth plate 35 with a flat top surface is provided on the top of the transmission side roller conveyor 3, and the smooth block cooperates with the smooth plate 35. The cooperation between the concave slider 21 and the convex slide plate 34 prevents the translation trolley 2 from sliding laterally off the roller conveyor. Here, "lateral" is equivalent to "longitudinal," where longitudinal is parallel to the working roller axis, and "lateral" is perpendicular to both longitudinal and vertical directions. In this embodiment, one side of the bottom of the frame 23 adopts a combination of concave and convex limiting form, while the other side adopts a combination of planar form, which satisfies the lateral limiting requirements, simplifies the structure, and saves processing costs.

[0030] Two pairs of fixing lugs 24 for securing ropes are longitudinally arranged on the top of the frame 23, with two of the fixing lugs 24 in each pair positioned on either side of the shaft placement area. The lower shaft 100 is placed on the support block 22, and ropes are passed through the fixing lugs 24 to secure the lower shaft 100 to the translation trolley 2, preventing the lower shaft 100 from falling off when the translation trolley 2 moves. A baffle 36 is installed at the end of the roller conveyor body 32 to provide axial limiting and prevent the translation trolley 2 from sliding off the roller conveyor body 32 when it slides excessively towards the transmission side.

[0031] To facilitate the connection between the translation trolley 2 and the working roll changing trolley 7, as well as between the translation trolley 2 and the traveling trolley 10, the frame 23 of the translation trolley 2 is provided with traction lugs 26 at both ends along the longitudinal direction.

[0032] A pulley mechanism 1 is provided at one end of the drive-side roller conveyor 3 opposite to the inner roller conveyor 4 of the mill. The lifting rope 9 connected to the traveling trolley 10 is deflected by the pulley mechanism 1 and then connected to the traction lug 26 of the translation trolley 2. The pulley mechanism 1 changes the direction of the pulling force of the traveling trolley 10, so that the traveling trolley 10 can pull the translation trolley 2 towards the drive side of the mill via the lifting rope 8.

[0033] The transmission side roller conveyor 3 includes a base 31 and a roller conveyor body 32. The base 31 is installed on the workshop foundation. The roller conveyor body 32 is installed on top of the base 31, and an adjusting bolt 33 is provided between the roller conveyor body 32 and the base 31. The elevation of the base 31 is adjusted by the adjusting bolt 33 to ensure that the elevation of the transmission side roller conveyor 3 is consistent with that of the inner roller conveyor 4 of the rolling mill, and to ensure that the translation trolley 2 slides smoothly on the roller conveyor.

[0034] The method for quickly changing the main drive shaft of a rolling mill using the above-mentioned quick-change system includes the following steps:

[0035] Step 1: After using the overhead crane 10 to lift away the mill work rolls, as follows... Figure 3 As shown, the trolley 10 lifts the translation trolley 2 onto the rolling mill work roll changing roller table 6. Then, the trolley 10 moves to the mill drive side. The lifting rope 9 passes through the pulley block on the pulley mechanism 1, with one end fixed to the traction lug 26 of the translation trolley 2 and the other end fixed to the lifting hook of the trolley 10. The trolley 10 then drags the translation trolley 2 to below the lower connecting shaft 100 on the mill drive side. The connecting bolts between the lower connecting shaft 100 and the main drive equipment are removed. The trolley 10 lifts the lower connecting shaft 100 and places it on the support block 22 of the translation trolley 2, and the old lower connecting shaft 100 is tied to the translation trolley 2 with ropes.

[0036] Step 2, as follows Figure 4 As shown, one end of the traction rope 8 is fixed to the traction lug 26 of the translation trolley 2, and the other end is fixed to the traction head of the working roller changing trolley 7. The translation trolley 2 carrying the lower connecting shaft 100 is dragged to the working roller changing roller track 6 by the working roller changing trolley 7. After removing the traction rope 8 and the connecting shaft fixing rope, the lower connecting shaft 100 is lifted away by the crane 10.

[0037] Step 3, as follows Figure 5As shown, the overhead crane 10 lifts the new lower shaft 100, places it on the translation trolley 2 and secures it with ropes. Then, the overhead crane 10 moves to the mill drive side. The lifting rope 9 passes through the pulley block, with one end fixed to the traction lug 26 of the translation trolley 2 and the other end fixed to the lifting hook of the overhead crane 10. The overhead crane 10 drags the translation trolley 2 to the mill drive side, loosens the shaft fixing rope, and the overhead crane 10 lifts the new lower shaft 100 and installs it onto the main drive equipment.

[0038] Step 4, as follows Figure 6 As shown, one end of the traction rope 8 is fixed to the traction lug 26 of the translation trolley 2, and the other end is fixed to the traction head of the working roll changing trolley 7. The translation trolley 2 is dragged to the working roll changing roller track 6 by the working roll changing trolley 7. At this point, the replacement of the main drive lower connecting shaft 100 is completed.

[0039] Cold rolling mills roll hot-rolled steel coils into cold-rolled coils at room temperature. The equipment has a smaller tonnage, stable main drive operation, low impact load, and is less prone to failure. The main drive shaft has a small diameter, is lightweight, and is easy to replace by direct hoisting. Hot rolling mills, on the other hand, roll slabs into steel coils at high temperatures. The equipment has a large tonnage, and the main drive is subjected to harsh conditions such as moisture, heat radiation, and impact loads, making it prone to failure. The main drive shaft has a large diameter, is heavy, and requires significant effort to replace by direct hoisting. The quick replacement system and method for the main drive shaft of this invention are well-suited for hot rolling mills, allowing for the replacement of the lower shaft by 100% without moving the upper shaft.

[0040] In the description of this specification, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" 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; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A quick-change system for the main drive shaft of a rolling mill, characterized in that: Includes rolling mill work roll changing equipment, drive side roller table (3), rolling mill inner roller table (4), and translation trolley (2); The rolling mill work roll changing equipment includes an operating side roller table (5), a work roll changing roller table (6), a work roll changing trolley (7), and a traveling crane (10). The drive side roller table (3), the inner roller table of the mill (4), the operation side roller table (5) and the work roll changing roller table (6) form a passage for the translation trolley (2) to translate along the center line of the mill. The translation trolley (2) is movably set on the passage. When the translation trolley (2) moves to the transmission side roller conveyor (3), the height position of the translation trolley (2) is lower than the height position of the lower connecting shaft (100). The translation trolley (2) is detachably connected to the traveling trolley (10) or the work roll changing trolley (7). The translation trolley (2) is pulled from the operating side of the rolling mill to the transmission side by the traveling trolley (10), and from the transmission side of the rolling mill to the operating side by the work roll changing trolley (7).

2. The quick-change system for the main drive shaft of a rolling mill as described in claim 1, characterized in that: The translation trolley (2) includes a frame (23), the top of the frame (23) is provided with a support block (22) for supporting the lower shaft (100), and the bottom sides of the frame (23) are respectively provided with sliders that slide with the passage.

3. The quick-change system for the main drive shaft of a rolling mill as described in claim 2, characterized in that: The slider on one side of the bottom of the frame (23) is a concave slider (21) with a concave bottom surface. A convex slide plate (34) with a raised top surface is provided on the top of the transmission side roller conveyor (3). The concave slider and the convex slide plate (34) cooperate. The slider on the other side of the bottom of the frame (23) is a smooth block (25) with a flat top surface. A smooth plate (35) with a flat top surface is provided on the top of the transmission side roller conveyor (3). The smooth block and the smooth plate (35) cooperate.

4. The quick-change system for the main drive shaft of a rolling mill as described in claim 2 or 3, characterized in that: Two pairs of fixed lugs (24) for tying ropes are provided longitudinally on the top of the frame (23), with the two fixed lugs (24) in each pair located on both sides of the axle placement area.

5. The quick-change system for the main drive shaft of a rolling mill as described in claim 2 or 3, characterized in that: The frame (23) of the translation trolley (2) is provided with traction lugs (26) at both ends along the longitudinal direction.

6. The quick-change system for the main drive shaft of a rolling mill as described in claim 5, characterized in that: A pulley mechanism (1) is provided at one end of the transmission side roller table (3) opposite to the inner roller table (4) of the mill. The lifting rope (9) connected to the trolley (10) is turned by the pulley mechanism (1) and then connected to the traction lug (26) of the translation trolley (2).

7. The quick-change system for the main drive shaft of a rolling mill as described in claim 2 or 3, characterized in that: The transmission side roller conveyor (3) includes a base (31) and a roller conveyor body (32); the base (31) is installed on the workshop foundation; the roller conveyor body (32) is installed on the top of the base (31), and an adjusting bolt (33) is provided between the roller conveyor body (32) and the base (31) to adjust the elevation of the base (31).

8. A method for quick replacement of the main drive shaft of a rolling mill, characterized in that... This includes the following steps: Step 1: After the working roll of the mill is lifted away by the overhead crane (10), the traverse trolley (2) is lifted by the overhead crane (10) onto the working roll changing roller table (6) of the mill. Then the overhead crane (10) is moved to the chicken-grabbing drive side. The lifting rope (9) passes through the pulley block on the pulley mechanism (1), and one end is fixed to the traction lug (26) of the traverse trolley (2), and the other end is fixed to the lifting hook of the overhead crane (10). The traverse trolley (2) is dragged by the overhead crane (10) to the lower connecting shaft (100) on the mill drive side. The lower connecting shaft is lifted by the overhead crane (10) and placed on the support block (22) of the traverse trolley (2). Step 2: Fix one end of the traction rope (8) to the traction lug (26) of the translation trolley (2) and the other end to the traction head of the working roller changing trolley (7). Use the working roller changing trolley (7) to drag the translation trolley (2) carrying the lower connecting shaft (100) to the working roller changing roller track (6). After removing the traction rope (8) and the connecting shaft fixing rope, use the crane (10) to lift the lower connecting shaft (100) away. Step 3: The crane (10) lifts the new lower shaft (100), places it on the translation trolley (2) and secures it with ropes. Then, the crane (10) moves to the mill drive side. The lifting rope (9) passes through the pulley block, with one end fixed to the traction lug (26) of the translation trolley (2) and the other end fixed to the lifting hook of the crane (10). The crane (10) drags the translation trolley (2) to the mill drive side. The shaft fixing rope is released, and the crane (10) lifts the new lower shaft (100) and installs it on the main drive equipment. Step 4: Fix one end of the traction rope (8) to the traction lug (26) of the translation trolley (2) and the other end to the traction head of the working roll changing trolley (7). Use the working roll changing trolley (7) to drag the translation trolley (2) onto the working roll changing roller track (6).

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