Repair equipment and repair process for dry cooling roller

Abstract

The present application relates to a repair device and repair process for a dry cooling roller, and to the technical field of roller repair, which includes an intermediate frequency furnace body, wherein two parallel mounting plates are fixedly connected to the intermediate frequency furnace body, the two mounting plates are located at the same height and are respectively located on both sides of the intermediate frequency furnace body, a transmission chain is provided on the mounting plate, and a plurality of placement plates arranged along the length direction of the transmission chain are fixedly connected to the transmission chain, the placement plates on the two mounting plates correspond to each other and are located at the same height, a driving assembly for driving the transmission chain for transmission is provided on the intermediate frequency furnace body, and a fixing assembly for fixing the end of the roller on the placement plate is provided on the placement plate. The present application has the effect of solving the technical problem that multiple existing rollers are heated unevenly in an intermediate frequency furnace.

Description

Technical Field

[0001] The present application relates to the technical field of roller repair, and in particular to a repair device and a repair process for a dry cooling roller. Background Art

[0002] Roller repair is an important means to extend the service life of rolls and reduce production costs in the metal processing industry. Rollers may suffer from wear, cracks, surface defects and other problems during use. The choice of repair method depends on the degree of damage, material and subsequent use requirements of the rolls. Usually, repair methods such as surfacing repair and laser cladding are used for repair.

[0003] During the surfacing repair process, it is usually necessary to use a medium frequency furnace to heat the roller sleeve. After the heating is completed, the protective mandrel needs to be pulled out and the worn mandrel needs to be repaired. However, in the related technology, the medium frequency furnace can usually only achieve a good heating state for a single roller. When multiple rollers need to be heated, the rollers are usually stacked and placed in the medium frequency furnace, which may cause the heating degree of each roller to be different, which may make it difficult to pull out the protective mandrel later. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a dry cooling roller repair device and repair process to solve the technical problem of uneven heating of multiple rollers in a medium frequency furnace.

[0005] First aspect

[0006] A dry cooling roller repair device provided in the present application adopts the following technical solution: a dry cooling roller repair device, comprising an intermediate frequency furnace body, wherein two parallel mounting plates are fixedly connected to the intermediate frequency furnace body, the two mounting plates are located at the same height and are respectively located on both sides of the intermediate frequency furnace body, a conveying chain is provided on the mounting plate, a plurality of placement plates arranged along the length direction of the conveying chain are fixedly connected to the conveying chain, the placement plates on the two mounting plates correspond to each other one by one and are located at the same height, a driving component for driving the conveying chain for transmission is provided on the intermediate frequency furnace body, and a fixing component for fixing the end of the rolling roller on the placement plate is provided on the placement plate.

[0007] By adopting the above technical solution, the roller to be repaired is placed in the medium frequency furnace, and the roller is placed on two relatively arranged placement plates at the same height, so that the placement plates provide support for the ends of the rollers, and then the ends of the rollers are fixed on the placement plates by adjusting the fixing components, and all the rollers are placed and fixed. Then the medium frequency furnace is started to heat the rollers, and at the same time, the driving component is controlled to transmit the transmission chain, so that the transmission chain drives multiple placement plates to move, thereby making multiple rollers move with the transmission chain in the medium frequency furnace body, thereby making each roller receive heat more evenly, so that multiple rollers are heated more evenly, and the occurrence of uneven heating of multiple rollers in the medium frequency furnace is reduced.

[0008] Optionally, the driving assembly includes a sprocket rotatably connected to the mounting plate, the sprocket is provided in two pieces and is respectively located at both ends of the conveying chain, the sprocket is meshed with the conveying chain, a driving motor is installed outside the intermediate frequency furnace body, the output shaft of the driving motor (22) passes through the side wall of the intermediate frequency furnace body (3) and the mounting plate, and the end of the output shaft of the driving motor is fixedly connected to the sprocket.

[0009] By adopting the above technical solution, the driving motor can be started to drive the sprocket to rotate, and then the sprocket drives the chain to transmit as a whole, so that the multiple placement plates move with the conveying chain.

[0010] Optionally, the fixing assembly includes a fixing belt with one end fixedly connected to the placement plate, the other end of the fixing belt is fixedly connected to a fixing block, the fixing block is threadedly connected to a fixing bolt, and the rod of the fixing bolt is threadedly connected to the placement plate.

[0011] By adopting the above technical solution, when the end of the roller is placed between the fixing belt and the placement plate, the fixing bolt can be threadedly connected to the placement plate by rotating the fixing bolt, thereby fixing the end of the roller on the placement plate.

[0012] Optionally, a mounting block is fixedly connected to the lower end of the placement plate, a same lifting ball is slidably connected between the mounting block and the placement plate, and an adjusting mechanism for lifting the lifting ball and driving the lifting ball to rotate is provided on the mounting plate.

[0013] By adopting the above technical scheme, the lifting ball can be lifted by the adjusting mechanism and driven to rotate, so that the lifting ball abuts against the roller during the rising process and lifts the roller a certain distance. At the same time, the adjusting mechanism will drive the lifting ball to rotate, so that the lifting ball drives the roller to rotate a certain range, changing the main heating position of the roller, so that each surface of the roller is heated more evenly.

[0014] The cam is an angular channel formed between a pair of camming axes and a pair of locking plates, wherein the cam is connected along the axis of the first and second axes, and the locking plate is connected along the axis of the first and second axes.

[0015] By adopting the above technical solution, the driving cam can be driven to rotate by the rotating assembly, so that the ramp tube abuts against the first abutting rod, so that the first abutting rod drives the cross bar to move back and forth under the restriction of the support rod, thereby making the transmission rod enter the lower end of the lifting ball or make the transmission rod away from the lower end of the lifting ball, and at the same time, the driving cam will make the second abutting rod reciprocate up and down around the rotation connection point of the second abutting rod and the cross bar, so that the upper end of the second abutting rod is lifted, thereby making the transmission rod abut against the lifting ball and driving the lifting ball to lift. In this way, the lifting ball drives the roller to rotate to a certain extent.

[0016] Optionally, the rotating assembly includes a support plate fixedly connected to the mounting plate, a driving rod passing through the support plate and rotatably connected, one end of the driving rod is fixedly connected to the driving cam, and the other end of the driving rod is fixedly connected to a first bevel gear, a second bevel gear is meshed on the first bevel gear, and an end face of the second bevel gear is parallel to the mounting plate, and a rotating motor is fixedly connected to the outside of the intermediate frequency furnace body, and an output shaft of the rotating motor passes through the side wall of the intermediate frequency furnace body and the mounting plate, and an end portion of the output shaft of the rotating motor is fixedly connected to the second bevel gear.

[0017] By adopting the above technical solution, the rotating motor can be started to drive the second bevel gear to rotate, thereby rotating the first bevel gear, thereby causing the first bevel gear to drive the driving cam to rotate through the driving rod.

[0018] Optionally, one end of the first abutment rod close to the driving cam is fixedly connected to an abutment wheel, and the first abutment rod abuts against the ramp cylinder through the abutment wheel; one end of the second abutment rod close to the driving cam is fixedly connected to an abutment ball, and the second abutment rod abuts against the driving cam through the abutment ball.

[0019] By adopting the above technical solution, the friction between the first abutment rod and the driving cam, and the friction between the second abutment rod and the ramp cylinder can be reduced by the abutment wheel and the abutment ball.

[0020] Second aspect

[0021] A dry cooling roller repair process, using the above-mentioned dry cooling roller repair equipment, comprises the following steps:

[0022] S1: Place the roll to be repaired on a placement plate in the medium frequency furnace so that the placement plate provides support for the end of the roll, and fix the end of the roll on the placement plate by adjusting the fixing assembly;

[0023] S2: Start the medium frequency furnace body to heat the rollers, and control the driving assembly to transmit the conveyor chain, so that the conveyor chain drives multiple placement plates to move, so that the rollers are evenly heated in the medium frequency furnace body;

[0024] S3: After heating is completed, the protective mandrel in the roller sleeve is pulled out, and the mandrel is worn and repaired by surfacing welding, and at least 2 layers of surfacing welding are required;

[0025] S4: Disassemble and inspect the bearing seat components and clean the bearing seat, retaining ring, liner and other parts with kerosene. Damaged parts need to be replaced, and the bearing must be replaced;

[0026] S5: The outer circle of the roller sleeve is processed to remove fatigue layer or cracks, and the single processing is greater than 8mm to ensure that the fatigue layer of the roller sleeve is completely removed and the welding quality is guaranteed.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. Control the driving component to transmit the conveying chain, so that the conveying chain drives multiple placement plates to move, thereby making multiple rollers move in the medium frequency furnace body along with the conveying chain, so that the heat received by each roller is relatively even, so that multiple rollers are heated more evenly, reducing the occurrence of uneven heating of multiple rollers in the medium frequency furnace;

[0029] 2. The driving motor can be started to drive the sprocket to rotate, and then the sprocket drives the chain as a whole to transmit, so that the multiple placement plates move with the conveying chain;

[0030] 3. The lifting ball can be lifted by the adjusting mechanism and driven to rotate, so that the lifting ball abuts against the roller during the rising process and lifts the roller a certain distance. At the same time, the adjusting mechanism will drive the lifting ball to rotate, so that the lifting ball drives the roller to rotate a certain range, changing the main heating position of the roller, so that each surface of the roller is heated more evenly. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0032] Figure 2 This is the overall structural intention of the medium frequency furnace body of the embodiment of the present application;

[0033] Figure 3 is a schematic structural diagram of the adjustment mechanism of an embodiment of the present application;

[0034] Figure 4 It is a schematic structural diagram of the second abutment rod of an embodiment of the present application.

[0035] In the figure, 1. mounting plate; 11. transmission chain; 12. placement plate; 2. driving assembly; 21. sprocket; 22. driving motor; 3. medium frequency furnace body; 31. flame retardant foam board; 4. fixing assembly; 41. fixing belt; 42. fixing block; 43. fixing bolt; 5. mounting block; 6. lifting ball; 7. adjusting mechanism; 71. limiting block; 72. support rod; 73. cross bar; 74. spring; 75. first abutting rod; 76. ramp tube; 77. second abutting rod; 78. transmission rod; 79. rotating assembly; 791. support plate; 792. driving rod; 793. first bevel gear; 794. second bevel gear; 795. rotating motor; 710. abutting wheel; 711. abutting ball; 712. driving cam; 8. limiting hole. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1 -Attached Figure 4 , further details of this application are given.

[0037] First aspect

[0038] A dry cooling roller repair device, referring to Figure 1 and Figure 2 , including an intermediate frequency furnace body 3, which is an intermediate frequency furnace for heating rollers in the prior art. The upper end of the intermediate frequency furnace body 3 is fixedly connected with a flame retardant foam plate 31 arranged along the end surface of the intermediate frequency furnace body 3. Two parallel mounting plates 1 are fixedly connected inside the intermediate frequency furnace body 3, and the two mounting plates 1 are vertically arranged and located at the same height. The two mounting plates 1 are respectively located on both sides of the inside of the intermediate frequency furnace body 3.

[0039] A conveyor chain 11 is provided on the mounting plate 1, and a plurality of placement plates 12 are fixedly connected to the conveyor chain 11. The placement plates 12 are arranged in an arc shape and fit the arc shape of the surface of the roll to be heated. The plurality of placement plates 12 are arranged equidistantly along the length direction of the conveyor chain 11. The placement plates 12 on the two mounting plates 1 correspond to each other and are located at the same height.

[0040] The intermediate frequency furnace body 3 is provided with a driving assembly 2 for driving the transmission chain 11 for transmission. The driving assembly 2 includes a sprocket 21 rotatably connected to the mounting plate 1, and the sprocket 21 is provided with two sprockets and arranged up and down. The sprockets 21 are respectively located at the upper and lower ends of the transmission chain 11, and the sprockets 21 are meshed with the transmission chain 11. A driving motor 22 is installed outside the intermediate frequency furnace body 3, and the output shaft of the driving motor 22 passes through the side wall of the intermediate frequency furnace body 3 and the mounting plate 1, and the output shaft end of the driving motor 22 is fixedly connected to the sprocket 21.

[0041] Thus, the driving motor 22 is started, and the driving motor 22 can drive the sprocket 21 to rotate, and then the sprocket 21 drives the entire chain to transmit, so that the multiple placement plates 12 move with the conveying chain 11.

[0042] Reference Figure 2 and Figure 3 The placement plate 12 is provided with a fixing assembly 4 for fixing the end of the roll on the placement plate 12. The fixing assembly 4 includes a fixing belt 41 fixedly connected to the placement plate 12 at one end, and the fixing belt 41 is set to a high temperature resistant material. The other end of the fixing belt 41 is fixedly connected to a fixing block 42, and the fixing block 42 abuts against the placement plate 12. A plurality of fixing bolts 43 are threadedly connected to the fixing block 42, and the rods of the fixing bolts 43 are threadedly connected to the placement plate 12.

[0043] Therefore, the fixing bolt 43 can be threadedly connected to the placement plate 12 or the rod of the fixing bolt 43 can be detached from the placement plate 12 by rotating the fixing bolt 43, thereby achieving the fixing or removal of the end of the roller on the placement plate 12.

[0044] The lower end of the placement plate 12 is fixedly connected with a mounting block 5, which is set in a rectangular parallelepiped shape. A limiting hole 8 is provided between the mounting block 5 and the placement plate 12 to connect the two, and a lifting ball 6 is slidably connected in the limiting hole 8. The upper end surface of the lifting ball 6 is placed below the inner arc surface of the placement plate 12, and the lower end surface of the lifting ball 6 is placed below the limiting hole 8. A channel for the second abutment rod 77 to enter the limiting hole 8 is provided in the mounting block 5.

[0045] Reference Figure 2 , Figure 3 and Figure 4The mounting plate 1 is provided with an adjustment mechanism 7 for lifting the lifting ball 6 and driving the lifting ball 6 to rotate. The adjustment mechanism 7 includes a limit block 71 fixedly connected to the mounting plate 1, and a support rod 72 is passed through and slidably connected to the limit block 71, and the support rod 72 is parallel to the end surface of the mounting plate 1. One end of the support rod 72 is fixedly connected to a cross bar 73, and the cross bar 73 is set in an L shape. A spring 74 is sleeved on the support rod 72, one end of the spring 74 is fixedly connected to the cross bar 73, and the other end of the spring 74 is fixedly connected to the limit block 71.

[0046] The end of the cross bar 73 away from the support bar 72 is fixedly connected to the first abutment bar 75, and the first abutment bar 75 extends downward. A driving cam 712 is provided on one side of the first abutment bar 75, and a ramp tube 76 arranged around the axis of the driving cam 712 is fixedly connected to the end surface of the driving cam 712 close to the end of the first abutment bar 75, and the ramp tube 76 is a sleeve with an arc-shaped notch on the arc surface. An abutment ball 711 is fixedly connected to the end of the first abutment bar 75 close to the ramp tube 76, and the abutment ball 711 abuts against the arc-shaped end surface of the ramp tube 76.

[0047] A second abutment rod 77 is provided at the cross bar 73, one end of the second abutment rod 77 is rotatably connected to the cross bar 73, the other end of the second abutment rod 77 is fixedly connected to an abutment wheel 710, the arc surface of the abutment wheel 710 abuts against the driving cam 712, and the upper end of the second abutment rod 77 is fixedly connected to a transmission rod 78 for abutting against the arc surface of the lifting ball 6. In order to increase the friction between the transmission rod 78 and the lifting ball 6, the transmission rod 78 is set to be toothed at one end close to the lifting ball 6.

[0048] The adjustment mechanism 7 also includes a rotating assembly 79 for driving the driving cam 712 to rotate. The rotating assembly 79 includes a support plate 791 fixedly connected to the mounting plate 1. A driving rod 792 is provided on the support plate 791 and is rotatably connected. One end of the driving rod 792 is fixedly connected to the driving cam 712, and the other end of the driving rod 792 is fixedly connected to a first bevel gear 793. A second bevel gear 794 is meshed with the first bevel gear 793. The end face of the second bevel gear 794 is parallel to the mounting plate 1. A rotating motor 795 is fixedly connected to the outer wall of the intermediate frequency furnace body 3. The output shaft of the rotating motor 795 is coaxially arranged with the second bevel gear 794. The output shaft of the rotating motor 795 passes through the side wall of the intermediate frequency furnace body 3 and the mounting plate 1, and the end of the output shaft of the rotating motor 795 is fixedly connected to the second bevel gear 794.

[0049] Therefore, when the transmission chain 11 reaches the position suitable for the transmission rod 78 to enter the inner part of the limiting hole 8, the driving motor 22 can be controlled to stop working. Then, the rotating motor 795 is started, and the rotating motor 795 can drive the second bevel gear 794 to rotate, thereby rotating the first bevel gear 793, thereby causing the first bevel gear 793 to drive the driving cam 712 to rotate through the driving rod 792. When the driving cam 712 rotates, the ramp cylinder 76 can abut against the abutment wheel 710 on the first abutment rod 75, so that the first abutment rod 75 drives the cross bar 73 to move back and forth left and right under the restriction of the support rod 72. The second abutment rod 77 drives the transmission rod 78 to enter the channel at the lower end of the lifting ball 6 or the second abutment rod 77 drives the transmission rod 78 away from the lower end of the lifting ball 6. At the same time, the driving cam 712 causes the second abutting rod 77 to reciprocate up and down around the rotation connection point between the second abutting rod 77 and the crossbar 73, thereby causing the upper end of the second abutting rod 77 to be lifted or lowered, and when the second abutting rod 77 is lifted, the transmission rod 78 can abut against the lifting ball 6 and drive the lifting ball 6 to be lifted. Thus, the transmission rod 78 can lift the lifting ball 6 and achieve a certain range of lateral movement, thereby achieving the effect of the lifting ball 6 lifting the roller and driving the roller to rotate by itself to a certain range.

[0050] Second aspect

[0051] The present invention provides a repair process for a dry cooling roller, using a repair device for a dry cooling roller in the first aspect, comprising the following steps:

[0052] S1: placing the roll to be repaired on the placement plate 12 in the medium frequency furnace, so that the placement plate 12 provides support for the end of the roll, and fixing the end of the roll on the placement plate 12 by adjusting the fixing component 4;

[0053] S2: Start the intermediate frequency furnace body 3 to heat the rollers, and at the same time control the driving assembly 2 to transmit the conveying chain 11, so that the conveying chain 11 drives the multiple placement plates 12 to move, so that the multiple rollers are evenly heated in the intermediate frequency furnace body 3;

[0054] S3: After heating is completed, the protective mandrel in the roller sleeve is pulled out, and the worn mandrel is repaired by surfacing welding, and at least 2 layers of surfacing welding are required;

[0055] S4: Disassemble and inspect the bearing seat components and clean the bearing seat, retaining ring, liner and other parts with kerosene. Damaged parts need to be replaced, including bearings.

[0056] S5: The outer circle of the roller sleeve is processed to remove fatigue layer or cracks, and the single processing is greater than 8mm to ensure that the fatigue layer of the roller sleeve is completely removed and the welding quality is guaranteed.

[0057] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A dry cooling roller repair device, comprising a medium frequency furnace body (3), characterized in that: Two parallel mounting plates (1) are fixedly connected inside the intermediate frequency furnace body (3); the two mounting plates (1) are located at the same height and are respectively located on two sides of the intermediate frequency furnace body (3); a transmission chain (11) is provided on the mounting plate (1); a plurality of placement plates (12) are fixedly connected to the transmission chain (11) and are arranged along the length direction of the transmission chain (11); the placement plates (12) on the two mounting plates (1) correspond to each other one by one and are located at the same height; and a driving component for driving the transmission chain (11) to transmit is provided on the intermediate frequency furnace body (3). (2), the placement plate (12) is provided with a fixing component (4) for fixing the end of the roller on the placement plate (12), the lower end of the placement plate (12) is fixedly connected to a mounting block (5), a lifting ball (6) is slidably connected between the mounting block (5) and the placement plate (12), the mounting plate (1) is provided with an adjustment mechanism (7) for lifting the lifting ball (6) and driving the lifting ball (6) to rotate, the adjustment mechanism (7) comprises a limit block (71) fixedly connected to the mounting plate (1), a limit block (71) is passed through and slidably connected to the limit block (71) A support rod (72) is connected, one end of the support rod (72) is fixedly connected to a cross rod (73), a spring (74) is sleeved on the support rod (72), one end of the spring (74) is fixedly connected to the cross rod (73), the other end of the spring (74) is fixedly connected to the limit block (71), one end of the cross rod (73) away from the support rod (72) is fixedly connected to a first abutment rod (75), one side of the first abutment rod (75) is provided with a driving cam (712), and an end surface of the driving cam (712) is fixedly connected to a spring arranged around the axis of the driving cam (712). The first abutment rod (75) abuts against the end surface of the ramp tube (76); a second abutment rod (77) is provided at the cross bar (73); one end of the second abutment rod (77) is rotatably connected to the cross bar (73); the other end of the second abutment rod (77) abuts against the driving cam (712); the upper end of the second abutment rod (77) is fixedly connected to a transmission rod (78) for abutting against the arc surface of the lifting ball (6); and the adjusting mechanism (7) further comprises a rotating assembly (79) for driving the driving cam (712) to rotate.

2. A dry cooling roller repair device according to claim 1, characterized in that: The driving assembly (2) includes a sprocket (21) rotatably connected to the mounting plate (1), wherein two sprockets (21) are provided and are respectively located at two ends of the conveying chain (11), and the sprockets (21) are meshed with the conveying chain (11). A driving motor (22) is installed outside the intermediate frequency furnace body (3), and an output shaft of the driving motor (22) passes through a side wall of the intermediate frequency furnace body (3) and the mounting plate (1) and is fixedly connected to the sprocket (21).

3. The dry cooling roller repairing device according to claim 1, characterized in that: The fixing assembly (4) comprises a fixing belt (41) with one end fixedly connected to the placement plate (12), the other end of the fixing belt (41) being fixedly connected to a fixing block (42), the fixing block (42) being threadedly connected to a fixing bolt (43), the rod of the fixing bolt (43) being threadedly connected to the placement plate (12).

4. The dry cooling roller repairing device according to claim 1, characterized in that: The rotating assembly (79) comprises a support plate (791) fixedly connected to the mounting plate (1), a driving rod (792) passing through the support plate (791) and rotatably connected thereto, one end of the driving rod (792) being fixedly connected to the driving cam (712), the other end of the driving rod (792) being fixedly connected to a first bevel gear (793), a second bevel gear (794) being meshed with the first bevel gear (793), an end face of the second bevel gear (794) being parallel to the mounting plate (1), a rotating motor (795) being fixedly connected to the outside of the intermediate frequency furnace body (3), an output shaft of the rotating motor (795) passing through a side wall of the intermediate frequency furnace body (3) and the mounting plate (1) and being fixedly connected to the second bevel gear (794).

5. The dry cooling roller repairing device according to claim 4, characterized in that: An end of the first abutment rod (75) close to the driving cam (712) is fixedly connected to an abutment wheel (710), and the first abutment rod (75) abuts against the ramp cylinder (76) via the abutment wheel (710); an end of the second abutment rod (77) close to the driving cam (712) is fixedly connected to an abutment ball (711), and the second abutment rod (77) abuts against the driving cam (712) via the abutment ball (711).

6. A repair process for a dry cooling roller, characterized in that: The repairing device for a dry cooling roller according to claim 1 comprises the following steps: S1: placing the roll to be repaired on a placement plate (12) in the medium frequency furnace so that the placement plate (12) provides support for the end of the roll, and fixing the end of the roll on the placement plate (12) by adjusting the fixing assembly (4); S2: starting the medium frequency furnace body (3) to heat the rollers, and at the same time controlling the driving component (2) to transmit the conveying chain (11), so that the conveying chain (11) drives the plurality of placement plates (12) to move, so that the rollers are evenly heated in the medium frequency furnace body (3); S3: After heating is completed, the protective mandrel in the roller sleeve is pulled out, and the worn mandrel is repaired by surfacing welding, and at least 2 layers of surfacing welding are required; S4: Disassemble and inspect the bearing seat components and clean the bearing seat, retaining ring, and lining parts with kerosene. Damaged parts need to be replaced, including the bearings. S5: The outer circle of the roller sleeve is processed to remove fatigue layer or cracks, and the single processing is greater than 8mm to ensure that the fatigue layer of the roller sleeve is completely removed and the welding quality is guaranteed.

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