Method for replacing roll bending cylinder of finishing mill in limited space

Abstract

The invention belongs to the technical field of rolling mill mechanical equipment overhaul, and particularly relates to a method for replacing a roll bending cylinder of a finishing mill in a limited space. Comprising the following steps: (1) manufacturing a special lifting appliance, an upper support and a lower support; (2) an upper support and a lower support are placed between an upper connecting shaft sleeve and a lower connecting shaft sleeve and between the lower connecting shaft sleeve and a lower supporting roller shaft respectively, connecting shaft embracing is opened, an upper connecting shaft and a lower connecting shaft fall on the upper support and the lower support respectively, and a hanging ring is installed on the gear base combination face of a roller bending cylinder; and (3) the special lifting appliance is moved to the transmission side of the finishing mill through the travelling crane, a first chain block, a second chain block, a third chain block and a fourth chain block are connected to the special lifting appliance in a hanging mode, and the first chain block and the fourth chain block are connected with the first lifting point and the lifting ring of the roll bending cylinder in a hanging mode respectively and tensioned. According to the invention, the operation is simple, the assembly and disassembly are simple, convenient and rapid, and the replacement operation can be completely realized under the condition that the connecting shaft and related accessories are not disassembled.

Description

Technical Field

[0001] The invention belongs to the technical field of maintenance of rolling mill mechanical equipment, and in particular relates to a method for replacing a finishing mill bending cylinder in a confined space. Background Art

[0002] The 1500mm wide-band production line has 7 finishing mills, and each mill has a bending roll cylinder at the inlet and outlet on the transmission side. The bending roll cylinder is maintained by a regular replacement system. The bending roll cylinder is installed on the two opposite arch surfaces at the inlet and outlet on the transmission side of the mill, and is connected to the upper and lower working roll shaft clamping device as a whole. After the machine is stopped, the shaft clamping and locking of the shaft can be carried out before the subsequent work such as working roll extraction can be carried out.

[0003] The first step of replacing the original bending roller cylinder is to remove the upper and lower connecting shafts, oil collecting hood and other related accessories of the working roller; the second step is to lift the original lifting beam and the new bending roller cylinder (acting as a counterweight) to the installation position, hang a 5t fall chain at each end of the lifting beam, bundle and lift the old and new bending roller cylinders, and manually pull the fall chain to ensure that the old and new bending roller cylinders are off the ground and the lifting beam is balanced; the third step is to dismantle the old bending roller cylinder and accessories, and contact the inspector to operate the old bending roller cylinder out of the archway installation position; the fourth step is to slowly move the old and new bending roller cylinders and lifting beams out of the narrow space to the open space through personnel commanding the crane operation, and install the new bending roller cylinder accessories after the old and new bending roller cylinders land; the fifth step is to lift the new and old bending roller cylinders in turn and exchange their positions, lift the new bending roller cylinder to the original installation position according to the fourth step for reinstallation, and finally restore the installation of the upper and lower connecting shafts and related accessories.

[0004] By reviewing the operation process through the time sequence diagram and focusing on the main links that take a long time, the following difficulties are found:

[0005] 1. If the upper and lower couplings are opened without disassembling, the oil collecting cover and the coupling connecting teeth will be damaged due to the free fall of the coupling, and the working roll cannot be reinstalled after the coupling is out of its original position. The coupling must be lifted and adjusted by a crane and then the coupling must be locked before the working roll can be reinstalled. The operation is cumbersome and difficult, and the crane cannot be adjusted at any time. The disassembly and installation of the upper and lower couplings takes 6 hours, which is not conducive to improving the maintenance efficiency. 2. Seven gear bases are installed in parallel on the transmission side of the finishing mill (with a distance of 4m between each two), there is a safety ladder above the gear base, and dust removal air duct columns are installed in the distance between the two gear bases (the column height is 6m), and dust removal ducts and other facilities are installed on the top. The required hanging beam is 5.5m long during operation, and the new and old bending roller cylinder bolts are hung at the two ends of the hanging beam. The horizontal and vertical space is narrow, which is not conducive to the adjustment of the spatial position of the hoisted objects.

[0006] To sum up: 1. The disassembly and installation of related accessories during the replacement process is labor-intensive; 2. The bending roller cylinder and the hanging beam cannot freely adjust their position and direction in a confined space, resulting in low operating efficiency, high labor intensity for operators, and long replacement time for the bending roller cylinder. Summary of the invention

[0007] The object of the present invention is to provide a method for replacing a finishing mill roll bending cylinder in a confined space, so as to solve the problems existing in the prior art.

[0008] The technical solution adopted by the present invention to solve its technical problem is:

[0009] A method for replacing a finishing mill roll bending cylinder in a confined space comprises the following steps:

[0010] (1) Make special lifting equipment, upper support and lower support;

[0011] (2) Place the upper support and the lower support between the upper shaft sleeve and the lower shaft sleeve and between the lower shaft sleeve and the lower support roller respectively, open the shaft holder, make the upper shaft and the lower shaft fall on the upper support and the lower support respectively, and install the lifting ring on the gear base joint surface of the bending roller cylinder;

[0012] (3) Move the special lifting device to the transmission side of the finishing mill by the crane, and hang the first fall chain, the second fall chain, the third fall chain, and the fourth fall chain on the special lifting device. The first fall chain and the fourth fall chain are respectively hung on the first lifting point and the lifting ring of the bending roll cylinder and tightened;

[0013] (4) Remove the connecting bolts from the mounting surface of the bending roll cylinder and lift the bending roll cylinder off the ground;

[0014] (5) Hook the second fall chain to the second lifting point of the roller bending cylinder, tighten the second fall chain and loosen and remove the first fall chain;

[0015] (6) Hook the third fall chain to the third lifting point of the roller bending cylinder, tighten the third fall chain and loosen and remove the second fall chain;

[0016] (7) Use a crane to lift the bending roll cylinder to the designated location to complete the disassembly;

[0017] (8) Install the bending cylinder in reverse order.

[0018] Furthermore, the special lifting equipment includes a hanging beam, a first hanging ear, a second hanging ear, a third hanging ear, a fourth hanging ear, a fifth hanging ear, a sixth hanging ear, and a seventh hanging ear. The sixth hanging ear and the seventh hanging ear are welded to the upper side of the hanging beam. The distance from the sixth hanging ear to the adjacent end of the hanging beam, the distance from the seventh hanging ear to the adjacent end of the hanging beam, and the distance between the sixth hanging ear and the seventh hanging ear are all equal. The first hanging ear, the second hanging ear, the third hanging ear, the fourth hanging ear, and the fifth hanging ear are uniformly welded to the lower side of the hanging beam in sequence from one end of the hanging beam.

[0019] Furthermore, the hanging beam is made of HM steel of 300mm×200mm.

[0020] Furthermore, the first fall chain, the second fall chain, the third fall chain and the fourth fall chain are respectively hung on the first lifting eye, the second lifting eye, the third lifting eye and the fifth lifting eye.

[0021] Furthermore, when installing the lifting ring on the gear base joint surface of the bending roller cylinder in step (2), first remove the connecting bolts on the gear base joint surface of the bending roller cylinder, and then thread the lifting ring into the screw hole of the gear base.

[0022] Furthermore, the upper support and the lower support are welded together with two rectangular steel plates and two arc-shaped steel plates. During welding, the two rectangular steel plates are placed in parallel, and the two arc-shaped steel plates are respectively welded between the upper and lower ends of the two rectangular steel plates, and the outer convex surfaces of the two arc-shaped steel plates face between the two rectangular steel plates.

[0023] Furthermore, the diameter of the arc-shaped steel plate on the upper side of the upper support is the diameter of the outer wall of the shaft sleeve on the bending roller cylinder, and the diameter of the arc-shaped steel plate on the lower side of the upper support is the diameter of the outer wall of the shaft sleeve on the bending roller cylinder.

[0024] Furthermore, the diameter of the arc-shaped steel plate on the upper side of the lower support is the diameter of the outer wall of the lower shaft sleeve of the bending roller cylinder, and the diameter of the arc-shaped steel plate on the lower side of the lower support is the diameter of the outer wall of the supporting roller shaft under the bending roller cylinder.

[0025] Furthermore, the first hanging point is located at the bending roll cylinder close to the rolling mill arch, the second hanging point is located at the upper connecting shaft of the bending roll cylinder close to the upper connecting shaft sleeve, and the third hanging point is located at the upper connecting shaft of the bending roll cylinder away from the upper connecting shaft sleeve.

[0026] The present invention has the following beneficial effects:

[0027] 1. The present invention is easy to operate, and its assembly and disassembly are simple and quick, and it is completely possible to carry out the replacement operation without removing the connecting shaft and related accessories.

[0028] 2. The lifting beam and bending roller cylinder no longer need to be adjusted horizontally or vertically during the process of lifting out and lifting in, which minimizes the possibility of workers being injured by the lifting objects, and effectively improves the operating efficiency by 25%, improving the safety of the operation.

[0029] 3. The use of special hoists realizes the continuity and rapidity of work in the finishing rolling area and similar working environments, and has achieved good economic benefits in actual production.

[0030] 4. The average operation time for changing the bending roller cylinder is shortened from 16 hours to 12 hours.

[0031] 5. The use of upper and lower supports during operation avoids the disassembly of accessories such as upper and lower connecting shafts and oil collecting covers, thus reducing labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of the present invention.

[0033] Figure 2 It is a structural schematic diagram of the special sling of the present invention.

[0034] Figure 3 It is a schematic diagram of the upper support structure of the present invention.

[0035] Figure 4 It is a schematic diagram of the lower support structure of the present invention.

[0036] Among them: 1. Lifting beam; 2. First lifting eye; 3. Second lifting eye; 4. Third lifting eye; 5. Fourth lifting eye; 6. Fifth lifting eye; 7. Sixth lifting eye; 8. Seventh lifting eye; 9. Upper support; 10. Lower support; 11. Rectangular steel plate; 12. Arc steel plate; 13. Upper connecting shaft sleeve; 14. Lower connecting shaft sleeve; 15. Lower support roller; 16. Upper connecting shaft; 17. Lower connecting shaft; 18. Bending roller cylinder; 19. Gear base; 20. Lifting ring; 21. Crane; 22. First fall chain; 23. Second fall chain; 24. Third fall chain; 25. Fourth fall chain; 26. First lifting point; 27. Second lifting point; 28. Third lifting point; 29. ​​Rolling mill arch. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0038] like Figure 1-4 As shown, a method for replacing a finishing mill bending cylinder in a confined space comprises the following steps:

[0039] (1) Make a special lifting device, an upper support 9, and a lower support 10.

[0040] The special lifting device comprises a lifting beam, a first lifting eye 2 , a second lifting eye 3 , a third lifting eye 4 , a fourth lifting eye 5 , a fifth lifting eye 6 , a sixth lifting eye 7 , and a seventh lifting eye 8 .

[0041] The hanging beam is made of 300mm×200mm HM steel.

[0042] The sixth lifting ear 7 and the seventh lifting ear 8 are welded on the upper side of the suspension beam, the distance from the sixth lifting ear 7 to the adjacent end of the suspension beam, the distance from the seventh lifting ear 8 to the adjacent end of the suspension beam and the distance between the sixth lifting ear 7 and the seventh lifting ear 8 are all equal, that is, the length of the suspension beam is divided into three equal parts, and the sixth lifting ear 7 and the seventh lifting ear 8 are welded at two equal points in the middle of the upper side of the suspension beam.

[0043] The first hanging eye 2, the second hanging eye 3, the third hanging eye 4, the fourth hanging eye 5, and the fifth hanging eye 6 are uniformly welded to the lower side of the hanging beam from one end of the hanging beam. That is, the length of the hanging beam is divided into four equal parts, the first hanging eye 2 and the fifth hanging eye 6 are welded to the two ends of the lower side of the hanging beam, and the second hanging eye 3, the third hanging eye 4, and the fourth hanging eye 5 are welded to the three equally divided points in the middle of the lower side of the hanging beam.

[0044] The upper support 9 and the lower support 10 are both welded together with two rectangular steel plates 11 and two arc-shaped steel plates 12. During welding, the two rectangular steel plates 11 are placed in parallel, and the two arc-shaped steel plates 12 are respectively welded between the upper and lower ends of the two rectangular steel plates 11, and the outer convex surfaces of the two arc-shaped steel plates 12 face between the two rectangular steel plates 11.

[0045] The diameter of the arc steel plate 12 on the upper side of the upper support 9 is the diameter of the outer wall of the shaft sleeve 13 on the bending roller cylinder 18, and the diameter of the arc steel plate 12 on the lower side of the upper support 9 is the diameter of the outer wall of the shaft sleeve 14 under the bending roller cylinder 18.

[0046] The diameter of the arc steel plate 12 on the upper side of the lower support 10 is the diameter of the outer wall of the lower shaft sleeve 14 of the bending roller cylinder 18, and the diameter of the arc steel plate 12 on the lower side of the lower support 10 is the diameter of the outer wall of the lower supporting roller shaft 15 of the bending roller cylinder 18.

[0047] (2) Place the upper support 9 and the lower support 10 between the upper connecting shaft sleeve 13 and the lower connecting shaft sleeve 14 and between the lower connecting shaft sleeve 14 and the lower supporting roller shaft 15 respectively, open the connecting shaft holder, so that the upper connecting shaft 16 and the lower connecting shaft 17 fall on the upper support 9 and the lower support 10 respectively, and install the lifting ring 20 on the joint surface of the gear base 19 of the bending roller cylinder 18.

[0048] When installing the lifting ring 20 on the joint surface of the gear base 19 of the bending roll cylinder 18 , first remove the connecting bolts on the joint surface of the gear base 19 of the bending roll cylinder 18 , and then thread the lifting ring 20 into the screw hole of the gear base 19 .

[0049] (3) Move the special lifting device to the transmission side of the finishing mill through the crane 21, that is, use the lifting rope to pass through the sixth lifting eye 7 and the seventh lifting eye 8, and then hang it on the hook of the crane 21 through the lifting rope. The first fall chain 22, the second fall chain 23, the third fall chain 24, and the fourth fall chain 25 are hung on the first lifting eye 2, the second lifting eye 3, the third lifting eye 4, and the fifth lifting eye 6 of the special lifting device respectively. The first fall chain 22 and the fourth fall chain 25 are respectively hung on the first lifting point 26 and the lifting ring 20 of the bending cylinder 18 and tightened. The first lifting point 26 is located at the bending cylinder 18 near the mill arch 29.

[0050] (4) Remove the connecting bolts on the mounting surface of the bending roller cylinder 18 and lift the bending roller cylinder 18 off the ground by the crane 21.

[0051] (5) The second fall chain 23 is hooked to the second hanging point 27 of the roller bending cylinder 18. The second hanging point 27 is located at the upper connecting shaft 16 of the roller bending cylinder 18 close to the upper connecting shaft sleeve 13. The first fall chain 22 is loosened and removed while the second fall chain 23 is tightened.

[0052] (6) The third fall chain 24 is hooked to the third hanging point 28 of the roller bending cylinder 18. The third hanging point 28 is located at the position where the upper connecting shaft 16 of the roller bending cylinder 18 is away from the upper connecting shaft sleeve 13. The second fall chain 23 is loosened and removed while the third fall chain 24 is tightened.

[0053] (7) The bending cylinder 18 is hoisted to the designated location by the crane 21 to complete the disassembly;

[0054] (8) When installing the bending roller cylinder 18, perform the operation in reverse.

[0055] Specifically, the upper support 9 and the lower support 10 are placed between the upper shaft sleeve 13 and the lower shaft sleeve 14 and between the lower shaft sleeve 14 and the lower support roller shaft 15, and the lifting ring 20 is installed on the joint surface of the gear base 19 of the bending roller cylinder 18. The first lifting lug 2, the second lifting lug 3, the third lifting lug 4, and the fifth lifting lug 6 of the special lifting device are respectively hung with the first falling chain 22, the second falling chain 23, the third falling chain 24, and the fourth falling chain 25. The fourth fall chain 25 and the third fall chain 24 are respectively hung on the lifting ring 20 and the third lifting point 28 of the bending cylinder 18 and tightened. After being hoisted to the transmission side of the finishing mill by the crane 21, the second fall chain 23 is hung on the second lifting point 27 of the bending cylinder 18, the third fall chain 24 is loosened and removed while the second fall chain 23 is tightened, and then the first fall chain 22 is hung on the first lifting point 26 of the bending cylinder 18, the second fall chain 23 is loosened and removed while the first fall chain 22 is tightened. The bending cylinder 18 is lowered to the installation position, the upper support 9 and the lower support 10 are taken out, the first fall chain 22 and the fourth fall chain 25 are removed, and other installation work such as bolt connection is continued, thereby completing the installation of the bending cylinder 18.

[0056] The above-described embodiments are merely descriptions of preferred implementations of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary persons in the art to the technical solution of the present invention should all fall within the scope of protection of the present invention.

[0057] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A method for replacing a finishing mill bending cylinder in a confined space, characterized in that: The following steps are involved: (1) Make special lifting equipment, upper support and lower support; (2) Place the upper support and the lower support between the upper shaft sleeve and the lower shaft sleeve and between the lower shaft sleeve and the lower support roller respectively, open the shaft holder, make the upper shaft and the lower shaft fall on the upper support and the lower support respectively, and install the lifting ring on the gear base joint surface of the bending roller cylinder; (3) Move the special lifting device to the transmission side of the finishing mill by the crane, and hang the first fall chain, the second fall chain, the third fall chain, and the fourth fall chain on the special lifting device. The first fall chain and the fourth fall chain are respectively hung on the first lifting point and the lifting ring of the bending roll cylinder and tightened; (4) Remove the connecting bolts from the mounting surface of the bending roll cylinder and lift the bending roll cylinder off the ground; (5) Hook the second fall chain to the second lifting point of the roller bending cylinder, tighten the second fall chain and loosen and remove the first fall chain; (6) Hook the third fall chain to the third lifting point of the roller bending cylinder, tighten the third fall chain and loosen and remove the second fall chain; (7) Use a crane to lift the bending roll cylinder to the designated location to complete the disassembly; (8) Install the bending cylinder in reverse order.

2. The method for replacing the bending cylinder of a finishing mill in a confined space according to claim 1, characterized in that: The special lifting device includes a hanging beam, a first hanging ear, a second hanging ear, a third hanging ear, a fourth hanging ear, a fifth hanging ear, a sixth hanging ear, and a seventh hanging ear. The sixth hanging ear and the seventh hanging ear are welded to the upper side of the hanging beam. The distance from the sixth hanging ear to the adjacent end of the hanging beam, the distance from the seventh hanging ear to the adjacent end of the hanging beam, and the distance between the sixth hanging ear and the seventh hanging ear are all equal. The first hanging ear, the second hanging ear, the third hanging ear, the fourth hanging ear, and the fifth hanging ear are uniformly welded to the lower side of the hanging beam in sequence from one end of the hanging beam.

3. The method for replacing the bending cylinder of a finishing mill in a confined space according to claim 2, characterized in that: The hanging beam is made of 300mm×200mm HM steel.

4. The method for replacing the bending cylinder of a finishing mill in a confined space according to claim 2, characterized in that: The first fall chain, the second fall chain, the third fall chain and the fourth fall chain are respectively hung on the first lifting eye, the second lifting eye, the third lifting eye and the fifth lifting eye.

5. The method for replacing the bending cylinder of a finishing mill in a confined space according to claim 1, characterized in that: When installing the lifting ring on the gear base joint surface of the bending roller cylinder in step (2), first remove the connecting bolts on the gear base joint surface of the bending roller cylinder, and then connect the lifting ring threadedly into the screw hole of the gear base.

6. The method for replacing the bending cylinder of a finishing mill in a confined space according to claim 1, characterized in that: The upper support and the lower support are both welded from two rectangular steel plates and two arc-shaped steel plates. During welding, the two rectangular steel plates are placed in parallel, and the two arc-shaped steel plates are respectively welded between the upper and lower ends of the two rectangular steel plates, and the outer convex surfaces of the two arc-shaped steel plates face between the two rectangular steel plates.

7. The method for replacing the bending cylinder of a finishing mill in a confined space according to claim 6, characterized in that: The diameter of the arc-shaped steel plate on the upper side of the upper support is the diameter of the outer wall of the upper shaft sleeve of the bending roller cylinder, and the diameter of the arc-shaped steel plate on the lower side of the upper support is the diameter of the outer wall of the lower shaft sleeve of the bending roller cylinder.

8. The method for replacing the bending cylinder of a finishing mill in a confined space according to claim 6, characterized in that: The diameter of the arc-shaped steel plate on the upper side of the lower support is the diameter of the outer wall of the lower shaft sleeve of the bending roller cylinder, and the diameter of the arc-shaped steel plate on the lower side of the lower support is the diameter of the outer wall of the supporting roller shaft of the bending roller cylinder.

9. The method for replacing the bending cylinder of a finishing mill in a confined space according to claim 1, characterized in that: The first hanging point is located at the bending roll cylinder close to the rolling mill arch, the second hanging point is located at the upper connecting shaft of the bending roll cylinder close to the upper connecting shaft sleeve, and the third hanging point is located at the upper connecting shaft of the bending roll cylinder away from the upper connecting shaft sleeve.

Images