Method for quickly replacing balance cylinder of lower main shaft of hot rolling and roughing mill

Abstract

The invention relates to the technical field of hot-rolling roughing mill replacement, in particular to a hot-rolling roughing mill lower spindle balance cylinder quick replacement method which adopts a balance cylinder flat head of an up-down split structure to replace an original balance cylinder flat head of an integral structure, and a lower spindle balance cylinder is separated from a lever support under the condition that the lever support is not disassembled. A fixed beam of an original lever support is changed into a movable beam which is easy to disassemble, and the space vacated after the lower main shaft balance cylinder is disassembled from the movable beam is rapidly replaced, the lower main shaft balance cylinder replacement and maintenance operation time is greatly shortened, it can be guaranteed that the pressure of a lower main transmission shaft is stable, the middle blank type is controllable, and the production efficiency is improved. The rolling stability is improved, the safety coefficient of operators is greatly improved, and safety risks are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of replacement of hot rolling roughing mills, and particularly to a method for quickly replacing the lower main shaft balance cylinder of a hot rolling roughing mill. Background Art

[0002] In hot rolling production line equipment, in order to avoid the generation of gaps between the working rolls due to the self-weight of the main shaft and the supporting rolls, a balance device is generally provided. When the lower main shaft balance cylinder of the balance device leaks, it will cause the balance pressure of the lower main transmission shaft of the roughing mill to be unstable, directly affecting the over-tolerance of the reduction deviation on both sides of the roughing rolls, making it difficult to control the shape of the intermediate billet and unstable rolling. It is necessary to carry out maintenance in a timely manner. Due to the design of the balance frame of the hot rolling roughing mill and the installation position of the lower main shaft balance cylinder, the replacement and maintenance of the lower main shaft balance cylinder cannot be processed in a timely and rapid manner. The average time for a single online replacement process is about 24 hours, seriously affecting the orderly progress of hot rolling production. Summary of the Invention

[0003] In order to solve the technical problem of difficult replacement and maintenance of the lower main shaft balance cylinder, the present invention replaces the original integral structure balance cylinder flat head with a split structure balance cylinder flat head, so that the lower main shaft balance cylinder can be separated from the lever bracket without disassembling the lever bracket, and then quickly replaced from the space vacated after disassembling the movable crossbeam. The disassembly and replacement time is reduced, the accident maintenance time is shortened, the output is increased, and personal injury accidents caused by replacing the lower main shaft balance cylinder are avoided.

[0004] In order to achieve the above object, the present invention is realized by adopting the following technical solutions:

[0005] A method for quickly replacing the lower main shaft balance cylinder of a hot rolling roughing mill, which replaces the original integral structure balance cylinder flat head with an upper and lower split structure balance cylinder flat head. The lower main shaft balance cylinder is separated from the lever bracket without removing the lever bracket, and the fixed crossbeam of the original lever bracket is changed to a detachable movable crossbeam. The lower main shaft balance cylinder is quickly replaced from the space vacated after disassembling the movable crossbeam. The specific replacement method is as follows:

[0006] S1. Before replacing the lower main shaft balance cylinder, use a jack to support between the lever frame body in the balance device and the lower main transmission shaft to fix the position of the lever bracket of the balance device;

[0007] S2. Disassemble the connecting bolts of the split structure balance cylinder flat head, disconnect the connection between the upper flat head and the lower flat head of the lower main shaft balance cylinder from the pin shaft to which they are connected, so that the connection between the lower main shaft balance cylinder and the lever bracket of the balance device is disconnected, and the connection between the lower main shaft balance cylinder and the lower main shaft bearing seat is separated;

[0008] S3. Remove the connection between the lever bracket and the movable crossbeam, move the movable crossbeam out of the lever bracket from one side, and vacate the space on one side of the lower main shaft balance cylinder as the replacement space for the lower main shaft balance cylinder;

[0009] S4. Use a chain block to pull out the upper flat head of the lower main shaft balance cylinder from the balance device, and then use the chain block to pull out the remaining part of the lower main shaft balance cylinder from the vacated replacement space out of the balance device;

[0010] S5. Use a chain block to push the other part of the replaced lower main shaft balance cylinder except the upper flat head from the replacement space vacated by the lever bracket to the position below the lower main shaft bearing seat in the lever bracket, and then reinstall the upper flat head and the movable crossbeam in sequence.

[0011] Furthermore, small vertical beams are arranged on both sides of the movable crossbeam, and the small vertical beams are attached to the lever beams on both sides.

[0012] Furthermore, the small vertical beam and the lever beam are connected by stud bolts.

[0013] Furthermore, the upper flat head and the lower flat head are fixedly connected by connecting bolts on both sides.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. The improved movable crossbeam and the split-type structure balance cylinder flat head greatly shorten the replacement and maintenance operation time of the lower main shaft balance cylinder. The replacement time is advanced from the original 24 hours to 6.5 hours, shortening the maintenance operation time by 17.5 hours, and the maintenance efficiency is increased by 72.9%.

[0016] 2. Create the feasibility of the daily maintenance operation of the balance device, avoid the limitation that only annual maintenance can implement the replacement operation items, ensure the pressure stability of the lower main transmission shaft, the controllability of the intermediate billet shape, improve the rolling stability, and at the same time greatly solve the long-term rolling stop risk hidden danger caused by balance cylinder failure and frame damage.

[0017] 3. Greatly improve the safety factor of the operators and avoid safety risks. Description of the Drawings

[0018] Figure 1 is a schematic diagram of the balance device of a method for quickly replacing the lower main shaft balance cylinder of a hot rolling roughing mill according to the present invention.

[0019] Figure 2 is a schematic diagram of the improved split-type structure balance cylinder flat head provided by the present invention.

[0020] Figure 3 is a schematic diagram of the improved movable crossbeam structure provided by the present invention.

[0021] Figure 4It is a schematic diagram of the flat head of the original overall structure balance cylinder provided by the present invention.

[0022] Figure 5 It is a schematic diagram of the original fixed crossbeam structure provided by the present invention.

[0023] In the figure: 1. Upper main shaft balance cylinder; 2. Lower main shaft balance cylinder; 3. Upper main shaft bearing seat; 4. Lower main shaft bearing seat; 5. Lever support; 6. Column; 7. Moving crossbeam; 8. Base; 9. Upper flat head; 10. Lower flat head; 11. Connecting bolt; 12. Flat head of the original overall structure balance cylinder; 13. Stud; 14. Fixed crossbeam; 15. Lever beam; 16. Small vertical beam. Specific embodiments

[0024] The following further describes the specific embodiments of the present invention with reference to the accompanying drawings:

[0025] Such as Figures 1 - 5As shown in the figure, a method for quickly replacing the lower main shaft balance cylinder of a hot rolling roughing mill. In this replacement method, a split-type structure balance cylinder flat head is used to replace the original integral structure balance cylinder flat head 12. The lower main shaft balance cylinder 2 is separated from the lever support 5 without removing the lever support 5. The original integral structure balance cylinder flat head 12 is directly sleeved on the pin shaft connecting the lower part of the lever support 5 and the lower main shaft bearing seat 4. The height and angle of the lever support 5 are adjusted by pushing the pin shaft with the lower main shaft balance cylinder 2. The lower main shaft bearing seat 4 connected to the lever support 5 will be adjusted in height and angle accordingly, improving the balance pressure stability of the lower main transmission shaft. Because of the overall connected design structure, if the lower main shaft balance cylinder 2 is damaged and leaks oil, resulting in unstable balance pressure of the lower main transmission shaft, when replacing the lower main shaft balance cylinder 2, the lever support 5 needs to be removed as a whole. The lever support 5 is not only connected to the lower main shaft bearing seat 4 and the lower main shaft balance cylinder 2, but also connected to the upper main shaft bearing seat 3 and the upper main shaft balance cylinder 1. Therefore, the required operation time is too long. After improvement, the split-type structure balance cylinder flat head is fixedly connected to the pin shaft by connecting bolts 11 for the upper flat head 9 and the lower flat head 10. If the lower main shaft balance cylinder 2 leaks oil and the balance pressure of the main transmission shaft is unstable, there is no need to remove the lever support 5. The upper main shaft bearing seat 3, the upper main shaft balance cylinder 1, and the lower main shaft bearing seat 4 do not need to change their positions. Just remove the connecting bolts 11 on both sides of the split-type balance cylinder flat head, disconnect the connection between the upper flat head 9 and the lower flat head 10, disconnect the split-type balance cylinder flat head from the pin shaft, and disconnect the lower main shaft balance cylinder 2 from the lever support 5 and also from the lower main shaft bearing seat 4. The lower main shaft balance cylinder 2 becomes an independent entity, and only the lower main shaft balance cylinder 2 needs to be replaced with a new one, which saves time and effort for replacement and maintenance. The original fixed crossbeam 14 of the lever support 5 is changed to a removable movable crossbeam 7. After the lower main shaft balance cylinder 2 is removed from the movable crossbeam 7, the space is quickly replaced. In the original balance device design, there is an upper main shaft balance cylinder 1 on one side of the lower main shaft balance cylinder 2, and a fixed crossbeam 14 on the other side blocks the replacement of the lower main shaft balance cylinder 2. Replace the original fixed crossbeam 14 welded on the lever support 5 with a removable movable crossbeam 7 connected by stud bolts 13. When replacing the lower main shaft balance cylinder 2, just remove the movable crossbeam 7, and a replacement space will be vacated on one side of the lower main shaft balance cylinder 2 for the replacement of the lower main shaft balance cylinder 2, which is simple and convenient. The specific replacement method is as follows:

[0026] S1. Before replacing the lower main shaft balance cylinder 2, use a jack to support between the lever support 5 and the lower main transmission shaft in the balance device, fix the position of the lever support 5 of the balance device to prevent the lever support 5 from shaking during the process of replacing the lower main shaft balance cylinder 2, and avoid the position changes of the upper main shaft bearing seat 3 and the lower main shaft bearing seat 4;

[0027] S2. Disassemble the connecting bolts 11 of the split-type structure balance cylinder flat head, disconnect the upper flat head 9 and the lower flat head 10 of the lower main shaft balance cylinder 2 from the pin shafts they are connected to, so that the connection between the lower main shaft balance cylinder 2 and the balance device lever bracket 5 is disconnected, and the connection between the lower main shaft balance cylinder 2 and the lower main shaft bearing seat 4 is separated;

[0028] S3. Remove the connection between the lever bracket 5 and the movable crossbeam 7, move the movable crossbeam 7 out of the lever bracket 5 from one side, leaving the space on one side of the lower main shaft balance cylinder 2 as the replacement space for the lower main shaft balance cylinder 2;

[0029] S4. Use a chain block to pull out the upper flat head 9 of the lower main shaft balance cylinder 2 from the balance device, and then use the chain block to pull out the remaining part of the lower main shaft balance cylinder 2 from the vacated replacement space from the balance device;

[0030] S5. Push the other parts of the replaced lower main shaft balance cylinder 2 except the upper flat head 9 into the position below the pin shaft of the lever bracket 5 from the replacement space vacated by the lever bracket 5 by using a chain block, and then reinstall the upper flat head 9 and the movable crossbeam 7 in sequence.

[0031] As Figure 3 shown, further, small vertical beams 16 are arranged on both sides of the movable crossbeam 7, the small vertical beams 16 are in contact with the two side lever beams 15, the lower ends of the columns 6 of the lever bracket 5 are provided with lever beams 15, one side of the lever beam 15 is arranged on the top of the upper main shaft balance cylinder 1, the upper main shaft balance cylinder 1 supports one end of the lever beam 15, and the height and angle of the upper main shaft bearing seat 3 are adjusted by hinged rotation through the lever beam 15 and the column 6. The other side of the lever beam 15 is internally provided with the movable crossbeam 7, and the end is supported on the base 8. The small vertical beams 16 on both sides of the movable crossbeam 7 are closely attached to the inner side of the lever beam 15.

[0032] As Figure 3 shown, further, the small vertical beam 16 and the lever beam 15 are connected by a stud 13 to fix the movable crossbeam 7 on the lever beam 15. The original fixed crossbeam 14 was directly welded to the lever beam 15 to form a whole. In the improved movable crossbeam 7, the two side small vertical beams 15 and the lever beam 16 are locked and fixed by the stud 13, and the movable crossbeam 7 is fixed on the lever beam 16.

[0033] As Figure 2 shown, further, the upper flat head 9 and the lower flat head 10 are fixedly connected by connecting bolts 11 on both sides.

[0034] The following embodiments are implemented on the premise of the technical solution of the present invention, and the detailed implementation manners and specific operation processes are given. However, the protection scope of the present invention is not limited to the following embodiments. The methods used in the following embodiments are all conventional methods unless otherwise specified.

[0035]

Embodiment

[0036] As Figures 1 - 5 shown, the movable crossbeam 7 is on one side of the lever beam 15, and the lower main shaft balance cylinder 2 is below the inside of the lever support 5. When replacing the lower main shaft balance cylinder 2, a 100T jack is selected according to the weights of the upper main shaft bearing block 3, the lower main shaft bearing block 4, and the lever support 5.

[0037] As Figure 2 shown, disassemble the split-type structure balance cylinder flat head connecting bolt 11 of the lower main shaft balance cylinder 2, and disconnect the upper flat head 9 and the lower flat head 10, so that the connection between the lower main shaft balance cylinder 2 and the pin shaft connecting to the lower main shaft bearing block 4 is disconnected.

[0038] As Figure 3 shown, remove the stud bolts 13 connecting the two sides of the movable crossbeam 7 to the lever beam 15, and move out the movable crossbeam 7.

[0039] Utilize the space generated after removing the movable crossbeam 7, and replace the lower main shaft balance cylinder 2 with a 1T chain block according to the static load of the lower main shaft balance cylinder 2.

[0040] After replacing the lower main shaft balance cylinder 2, reinstall the movable crossbeam 7 and the split-type structure balance cylinder flat head in sequence.

[0041] Since there is an in-and-out space position for the lower main shaft balance cylinder 2, when the lower main shaft balance cylinder 2 is damaged, only the movable crossbeam 7 and the split-type structure balance cylinder flat head need to be removed, and the lower main shaft balance cylinder 2 can be repaired and replaced in a short time, avoiding the need for long-time repair and replacement of the lower main shaft balance cylinder 2 in the original operation method, reducing the labor intensity and at the same time reducing the spare part maintenance cost.

Claims

1. A method for quickly replacing the lower main shaft balance cylinder of a hot rolling roughing mill, characterized in that, The replacement method uses an upper and lower split structure balance cylinder flat head to replace the original integral structure balance cylinder flat head. The lower main shaft balance cylinder is separated from the lever bracket without removing the lever bracket, and the fixed cross beam of the original lever bracket is changed to a detachable movable cross beam. The space vacated after the lower main shaft balance cylinder is removed from the movable cross beam is quickly replaced. The specific replacement method is as follows: S1. Before replacing the lower main shaft balance cylinder, use a jack to support between the lever bracket and the lower main transmission shaft in the balance device to fix the position of the lever bracket of the balance device; S2. Remove the connecting bolts of the split structure balance cylinder flat head, and disconnect the upper flat head and the lower flat head of the lower main shaft balance cylinder from the pin shaft they are connected to. In this way, the connection between the lower main shaft balance cylinder and the lever bracket of the balance device is disconnected, and the connection between the lower main shaft balance cylinder and the lower main shaft bearing seat is separated; S3. Remove the connection between the lever bracket and the movable cross beam, move the movable cross beam out of the lever bracket from one side, and vacate the space on one side of the lower main shaft balance cylinder as the replacement space for the lower main shaft balance cylinder; S4. Use a chain block to pull out the upper flat head of the lower main shaft balance cylinder from the balance device, and then use a chain block to pull out the remaining part of the lower main shaft balance cylinder from the vacated replacement space from the balance device; S5. Use a chain block to push the other parts of the replaced lower main shaft balance cylinder except the upper flat head into the position below the lower main shaft bearing seat in the lever bracket from the replacement space vacated by the lever bracket, and then reinstall the upper flat head and the movable cross beam in sequence.

2. A method for quickly replacing the lower main shaft balance cylinder of a hot rolling roughing mill according to claim 1, characterized in that, Small vertical beams are arranged on both sides of the movable cross beam, and the small vertical beams are attached to the lever beams on both sides.

3. A method for quickly replacing the lower main shaft balance cylinder of a hot rolling roughing mill according to claim 2, characterized in that, The small vertical beam and the lever beam are connected by stud bolts.

4. A method for quickly replacing the lower main shaft balance cylinder of a hot rolling roughing mill according to claim 1, characterized in that, The upper flat head and the lower flat head are fixedly connected by connecting bolts on both sides.

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