Replacement device for balance cylinder of supporting roller of finishing mill and online replacement method for cylinder barrel

Abstract

The invention relates to the technical field of finishing mill back-up roll balance cylinders, and particularly discloses a finishing mill back-up roll balance cylinder replacement device and an online cylinder barrel replacement method.The finishing mill back-up roll balance cylinder replacement device comprises a force bearing beam and a jacking rib plate, the force bearing beam is connected with the jacking rib plate through a guide chain, the jacking rib plate is connected with a guide plate through a connecting bolt, and a jack is arranged on the lower portion of the jacking rib plate; the jack is used for applying jacking force to the jacking rib plate; a locking block is welded to the upper portion of the guide plate, a locking pin is arranged in the locking block, and the locking pin is inserted into the through hole of the cylinder barrel and locked. An integrated device which is high in efficiency, high in stability and low in cost is adopted to replace an existing tool maintenance technical scheme, efficient replacement of the balance cylinder is achieved, and the repair cost and the replacement difficulty are greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of the backup roll balance cylinder of a finishing mill, and particularly relates to a replacement device for the backup roll balance cylinder of a finishing mill and an on-line replacement method for a cylinder barrel. Background Art

[0002] During the long-term rolling process, the backup roll balance hydraulic cylinder of a finishing mill is affected by the vibration of the rolling mill and hydraulic shock, and is prone to the situation of wear, oil leakage and internal leakage on the inner wall of the cylinder barrel, resulting in balance failure. The poor balance state will lead to a reduction in the adjustment accuracy of the roll gap, uneven sizes of rolled pieces and poor surface quality. At the same time, it is difficult or even impossible to lift the backup roll, resulting in the inability to change the roll. Therefore, in view of the adverse consequences caused by the damage of the backup roll hydraulic cylinder, at present, the periodic management method is mainly adopted for disassembly, inspection and replacement. There are mainly two current replacement methods. One is to use a simple round steel and angle steel device, extend it into the through hole inside the cylinder barrel, align the round steel with the through hole, and pull out the cylinder barrel by a chain block. Since this device relies only on manpower and has a small jacking force, it cannot effectively take out the cylinder barrel. Moreover, the accuracy of this device is low, and lateral movement occurs during the stretching process, which is likely to damage the inner wall of the cylinder barrel. The other is to replace the CVC block as a whole. This method has a high construction difficulty, a long construction time, is prone to over-maintenance, and has poor economic benefits. Therefore, in the existing two construction methods, there are problems such as low maintenance efficiency and high construction costs.

[0003] The working environment of the backup roll balance cylinder of a hot rolling finishing mill is harsh. During the long-term rolling process, it is affected by the vibration of the rolling mill, hydraulic shock, and water vapor corrosion, etc., and is prone to the situation of wear, oil leakage and internal leakage of the cylinder barrel, resulting in the inability of the hydraulic system to maintain pressure. Due to certain drawbacks of the existing replacement devices. Therefore, there is an urgent need to design a replacement device for the backup roll balance cylinder of a finishing mill and an on-line replacement method for a cylinder barrel. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a replacement device for the backup roll balance cylinder of a finishing mill and an on-line replacement method for a cylinder barrel, and adopt an integrated device with high efficiency, strong stability and low cost to replace the maintenance technical solution of the existing tooling.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a replacement device for the backup roll balance cylinder of a finishing mill, including a bearing beam and a jacking rib plate. The bearing beam is connected to the jacking rib plate through a chain block. The jacking rib plate is connected to a guide plate through a connecting bolt. A jack is arranged below the jacking rib plate, and the jack is used to apply a jacking force to the jacking rib plate. A locking block is welded above the guide plate, and a locking pin is arranged inside the locking block. The locking pin is inserted into the through hole of the cylinder barrel and locked.

[0006] Specifically, the bearing beam is directly above the backup roll hydraulic cylinder, and both ends of the bearing beam are fixedly connected to the housing through 4 bolts.

[0007] Specifically, there are two positioning grooves provided on the load-bearing beam. A hoist chain is installed and positioned within the positioning grooves. The load-bearing beam and the hoist chain are used for hoisting the hydraulic cylinder barrel of the inlet and outlet support rollers.

[0008] Specifically, the shape of the jacking rib plate is convex. There is a lifting ring provided on the jacking rib plate. The lifting ring is connected to the hook of the hoist chain. There are 4 bolt holes provided on the jacking rib plate. The bolt holes on the jacking rib plate are connected to the upper part of the connecting bolts. There are 4 bolt holes provided at the fitting position of the guide plate. The bolt holes on the guide plate are connected to the lower part of the connecting bolts.

[0009] Specifically, the size of the connecting bolts is M24*350mm.

[0010] Specifically, the shape of the guide plate is cylindrical. The size of the guide plate is a diameter of φ129.8*60mm. A locking block is welded above the guide plate.

[0011] Specifically, there are 4 locking blocks in total. There is a through hole provided inside the locking block. A locking pin is inserted into the through hole.

[0012] Specifically, there are 4 locking pins in total. The size of the locking pins is a diameter of φ17.4*30mm. The locking pins are locked with the through holes of the cylinder barrel.

[0013] Specifically, there are 2 hydraulic jacks in total. The upper end of the hydraulic jacks abuts against the bottom of the jacking rib plate. The lower end of the hydraulic jacks is placed on the support roller balance cylinder block, and is used to apply a jacking force to the jacking rib plate.

[0014] An on-line replacement method for the cylinder barrel of a support roller balance cylinder replacement device of a finishing mill includes the following steps:

[0015] S01: The roll lowering device is in the roll changing position, and the upper support roll and the work roll are withdrawn.

[0016] S02: After the roll withdrawal is completed, the hydraulic cylinder is at the lowest position, and the hydraulic pump and the hydraulic valve are closed.

[0017] S03: Remove the 4 bolts of the cross centerline housing slide plate above the balance cylinder, and fix the load-bearing beam to the housing.

[0018] S04: Install the hoist chain in the positioning groove of the load-bearing beam, install a cylinder rod clamp below the hoist chain, remove the cylinder barrel gland, take out the cylinder rod, and remove the cylinder rod clamp.

[0019] S05: Assemble the guide plate and the jacking rib plate.

[0020] S06: Place dry ice in the cylinder barrel, and utilize the cold shrinkage principle to cool for 40 minutes to shrink the cylinder barrel.

[0021] S07: Connect the assembled device in S05 to the hoist chain through the lifting ring, place it inside the cylinder barrel, and lock it with the locking pin in the through-hole of the cylinder barrel.

[0022] S08: Apply synchronous jacking force to the jacking rib plate with two hydraulic jacks and jack it up by 120 mm.

[0023] S09: Stretch the device in S05 with the hoist chain until the entire cylinder barrel is pulled out, the disassembly is completed, and a new cylinder barrel is replaced.

[0024] The present invention has the following beneficial effects:

[0025] The roll chock balance cylinder replacement device and the on-line cylinder barrel replacement method designed by the present invention adopt an integrated device with high efficiency, strong stability and low cost to replace the maintenance technical solution of the existing tooling, including integrating components such as the load-bearing beam, jacking rib plate, lifting ring, connecting bolt, guide plate, locking block, locking pin, hoist chain, and jack, to achieve the efficient replacement of the balance cylinder, and greatly reduce the repair cost and replacement difficulty. Description of the Drawings

[0026] Figure 1 It is a schematic installation structure diagram of the roll chock balance cylinder replacement device.

[0027] Figure 2 It is Figure 1 The partial enlarged structure diagram in

[0028] Figure 3 It is Figure 2 The partial enlarged structure diagram in

[0029] Figure 4 It is a longitudinal sectional view of the cylinder barrel.

[0030] Figure 5 It is a cross-sectional view of the cylinder barrel.

[0031] Figure 6 It is the front view of the jacking rib plate.

[0032] Figure 7 It is the top view of the jacking rib plate.

[0033] Figure 8 It is the front view of the locking block and locking pin arranged on the guide plate.

[0034] Figure 9 It is the top view of the locking block and locking pin arranged on the guide plate.

[0035] Figure 10 It is the structural diagram of the locking pin.

[0036] Figure 11 It is the structural diagram of the connecting bolt.

[0037] In the figure: 1 - load-bearing beam, 2 - chain block, 3 - lifting rib plate, 4 - jack, 5 - housing; 6 - cylinder barrel, 7, guide plate, 8 - locking block, 9 - locking pin, 10 - connecting bolt, 11 - lifting ring, 12 - fixing bolt. Specific embodiments

[0038] The following will further clearly and completely describe in detail the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] As Figures 1 - 11 shown, a replacement device for the balance cylinder of the backup roll of a finishing mill includes a load-bearing beam 1, a lifting rib plate 3, a lifting ring 11, a connecting bolt 10, a guide plate 7, a locking block 8, a locking pin 9, a chain block 2, and a jack 4. The load-bearing beam 1 is provided with a positioning groove, and the load-bearing beam 1 is connected to the lifting ring 11 of the lifting rib plate 3 through the chain block 2.

[0040] The lifting rib plate 3 is connected to the guide plate 7 through the connecting bolt 10. A jack 4 is arranged below the lifting rib plate 3, and the jack 4 is used to apply an upward force to the lifting rib plate 3; a locking block 8 is welded above the guide plate 7, and a locking pin 9 is arranged inside the locking block 8. The locking pin 9 is inserted into and locked with the through hole of the cylinder barrel 6.

[0041] The load-bearing beam 1 is directly above the backup roll hydraulic cylinder, and both ends of the load-bearing beam 1 are fixedly connected to the housing 5 through 4 bolts.

[0042] There are two positioning grooves on the load-bearing beam 1. The chain block 2 is installed and positioned in the positioning grooves. The load-bearing beam 1 and the chain block 2 are used for hoisting the inlet and outlet backup roll hydraulic cylinder barrels. The chain block 2 is a manual hoist.

[0043] The shape of the lifting rib plate 3 is convex. There is a lifting ring 11 on the lifting rib plate 3. The lifting ring 11 is connected to the hook of the chain block 2. There are 4 bolt holes on the lifting rib plate 3. The bolt holes on the lifting rib plate 3 are connected to the upper part of the connecting bolt 10. There are 4 bolt holes at the matching position of the guide plate 7. The bolt holes on the guide plate 7 are connected to the lower part of the connecting bolt 10.

[0044] The size of the connecting bolt 10 is M24*350mm.

[0045] The shape of the guide plate 7 is cylindrical. The size of the guide plate 7 is diameter φ129.8*60mm. A locking block 8 is welded above the guide plate 7.

[0046] There are 4 locking blocks 8 in total. There is a through hole inside the locking block 8, and the locking pin 9 is inserted into the through hole.

[0047] There are 4 locking dowel pins 9 in total. The size of the locking dowel pin 9 is diameter φ17.4 * 30 mm, and the locking dowel pin 9 is locked with the through hole of the cylinder barrel 6.

[0048] There are 2 hydraulic jacks 4 in total. The upper end of the hydraulic jack 4 abuts against the bottom of the lifting rib plate 3, and the lower end of the hydraulic jack 4 is placed on the support roller balance cylinder block, which is used to apply an upward force to the lifting rib plate 3.

[0049] An on-line replacement method for the cylinder barrel of a support roller balance cylinder replacement device of a finishing mill, which efficiently replaces the support roller balance cylinder barrel 6 with serious corrosion on the outside, scratches and damages on the inner wall, and unable to maintain pressure, includes the following steps:

[0050] S01: The rolling-down device is in the roll-changing position, and the upper support roller and the work roll are withdrawn.

[0051] S02: After the roll withdrawal is completed, the hydraulic cylinder is at the lowest position, and the hydraulic pump and the hydraulic valve are closed.

[0052] S03: Remove the 4 bolts of the cross-centerline housing slide plate above the balance cylinder, and fix the bearing beam to the housing 5.

[0053] S04: Install the chain hoist 2 in the positioning groove of the bearing beam 1, install a cylinder rod clamp below the chain hoist 2, remove the cylinder barrel gland, take out the cylinder rod, and remove the cylinder rod clamp.

[0054] S05: Assemble the guide plate 7 and the lifting rib plate 3.

[0055] S06: Place dry ice in the cylinder barrel 6, and use the cold shrinkage principle to cool for 40 minutes to shrink the cylinder barrel 6.

[0056] S07: Connect the device assembled in S05 to the chain hoist 2 through the lifting ring 11, place it inside the cylinder barrel 6, and lock it with the through hole of the cylinder barrel 6 using the locking dowel pin 9.

[0057] S08: Use two hydraulic jacks 4 to apply an upward force to the lifting rib plate 3 synchronously and lift it by 120 mm.

[0058] S09: Use the chain hoist to stretch the device in S05 until the cylinder barrel 6 is completely pulled out, the disassembly is completed, and a new cylinder barrel 6 is replaced.

[0059] Through the above-mentioned support roller balance cylinder replacement device and the on-line replacement method for the cylinder barrel of the finishing mill, the present invention uses common parts and an integrated replacement device to ensure the stability of the disassembly and assembly of the support roller balance cylinder barrel 6, can efficiently complete the on-line replacement of the cylinder barrel 6, and solves the problems of low efficiency in replacing the cylinder barrel 6 and high maintenance costs.

[0060] The present invention solves the problem of the production line shutdown caused by the damage of the support roller balance cylinder during the rolling process, reduces the equipment failure shutdown time, and improves the production efficiency.

[0061] The present invention is not limited to the above embodiments. Anyone should know that structural changes made under the inspiration of the present invention, as long as the technical solutions are the same as or similar to those of the present invention, all fall within the protection scope of the present invention.

[0062] The technologies, shapes, and structures not described in detail in the present invention are all well-known technologies.

Claims

1. A device for replacing the balance cylinder of a finishing mill backup roll, characterized in that It includes a load-bearing beam and a jacking rib plate. The load-bearing beam is connected to the jacking rib plate through a hoist chain. The jacking rib plate is connected to a guide plate through connecting bolts. A jack is arranged at the lower part of the jacking rib plate, and the jack is used to apply a jacking force to the jacking rib plate. A locking block is welded above the guide plate, and a locking pin is arranged inside the locking block. The locking pin is inserted into and locked with the through hole of the cylinder barrel.

2. The backup roll balance cylinder replacement device of the finishing mill according to claim 1, characterized in that, The load-bearing beam is directly above the support roll hydraulic cylinder, and both ends of the load-bearing beam are fixedly connected to the housing through 4 bolts.

3. The backup roll balance cylinder replacement device of the finishing mill according to claim 2, characterized in that, There are two positioning grooves on the load-bearing beam. A hoist chain is installed and positioned in the positioning groove. The load-bearing beam and the hoist chain are used for hoisting the inlet and outlet support roll cylinder barrels.

4. The backup roll balance cylinder replacement device of the finishing mill according to claim 1, characterized in that, The shape of the jacking rib plate is convex. There is a lifting ring on the jacking rib plate. The lifting ring is connected to the hook of the hoist chain. There are 4 bolt holes on the jacking rib plate. The bolt holes on the jacking rib plate are connected to the upper part of the connecting bolts. There are 4 bolt holes at the matching position of the guide plate. The bolt holes on the guide plate are connected to the lower part of the connecting bolts.

5. The backup roll balance cylinder replacement device of the finishing mill according to claim 4, characterized in that, The size of the connecting bolt is M24*350mm.

6. The replacement device for the balance cylinder of the finishing mill backup roll according to claim 1, wherein The shape of the guide plate is cylindrical. The size of the guide plate is diameter φ129.8*60mm. A locking block is welded above the guide plate.

7. The backup roll balance cylinder replacement device of the finishing mill according to claim 6, characterized in that, There are 4 locking blocks in total. There is a through hole inside the locking block, and a locking pin is inserted into the through hole.

8. The backup roll balance cylinder replacement device of the finishing mill according to claim 7, characterized in that There are 4 locking pins in total. The size of the locking pin is diameter φ17.4*30mm. The locking pin is locked with the through hole of the cylinder barrel.

9. The backup roll balance cylinder replacement device of the finishing mill according to claim 1, characterized in that, There are 2 hydraulic jacks in total. The upper end of the hydraulic jack abuts against the bottom of the jacking rib plate, and the lower end of the hydraulic jack is placed on the support roll balance cylinder block, and is used to apply a jacking force to the jacking rib plate.

10. The online replacement method for the cylinder barrel of the finishing mill backup roll balance cylinder replacement device according to any one of claims 1-9, characterized in that, It includes the following steps: S01: The roll-changing device is in the roll-changing position, and the upper support roll and the working roll are withdrawn. S02: After the roll withdrawal is completed, the hydraulic cylinder is at the lowest position, and the hydraulic pump and the hydraulic valve are closed. S03: Remove 4 bolts of the housing slide plate at the horizontal center line above the balance cylinder, and fix the load-bearing beam on the housing. S04: Install the hoist chain in the positioning groove of the load-bearing beam, install a cylinder rod clamp below the hoist chain, remove the cylinder barrel gland, take out the cylinder rod, and remove the cylinder rod clamp. S05: Assemble the guide plate and the jacking rib plate. S06: Place dry ice in the cylinder barrel, and use the principle of cold shrinkage to cool for 40 minutes to shrink the cylinder barrel. S07: Connect the device assembled in S05 to the hoist chain through the lifting ring, place it inside the cylinder barrel, and lock it with the locking pin and the through hole of the cylinder barrel. S08: Use two hydraulic jacks to synchronously apply a jacking force to the jacking rib plate and jack it up by 120mm. S09: Use the hoist chain to stretch the device in S05 until the cylinder barrel is completely pulled out, the disassembly is completed, and a new cylinder barrel is replaced.

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