A method for adjusting the gap between the blades of a hot continuous rolling rotary hub flying shear

Abstract

The present application belongs to the technical field of metallurgical machinery, and provides a kind of hot continuous rolling rotary hub type flying shear blade gap adjustment method, after adjusting flying shear cutting head shear blade gap by moving rotary hub axially through flying shear shear blade gap adjustment mechanism, adjust flying shear cutting tail shear blade gap by grinding L-shaped lining plate of flying shear cutting tail shear blade, find suitable grinding amount by grinding shear blade first, then carry out quantitative grinding to L-shaped lining plate, solve the problem that hot continuous rolling finishing rotary hub type flying shear cutting head and cutting tail shear blade gap cannot be adjusted separately, prolong the service life of flying shear, improve the shearing precision of finishing flying shear, reduce the fault of flying shear cutting tail sticking of production line.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical machinery technology, and relates to a hot continuous rolling mill finishing hub-type flying shear equipment, specifically a method for quickly adjusting the shear blade gap of a hot continuous rolling mill hub-type flying shear. Background Technology

[0002] In the hot strip mill finishing process of the metallurgical industry, the main function of the rotary drum flying shear is to cut off the irregular heads and tails of the strip steel, ensuring that the strip steel can smoothly enter the finishing mill for rolling. The shearing mechanism of the flying shear is an assembly of a rotary drum and synchronous gears, consisting of upper and lower rotary drums, blades and their locking mechanism, thrust bearing device, etc. Each rotary drum is equipped with two shear blades arranged at 90°. There are two pairs of shear blades in total on the upper and lower rotary drums, one pair for cutting off the head of the intermediate billet and the other pair for cutting off the tail. Both the head-cutting and tail-cutting shear blades are arc-shaped. There is a gap between the upper and lower shear blades, which is adjusted by axially moving the upper rotary drum through the flying shear blade gap adjustment mechanism. The flying shear blade gap adjustment mechanism is set on the operating side of the upper rotary drum. During adjustment, the locking pin on the small gear is first loosened, and then the hydraulic motor drives the large gear with an inner sleeve to reduce speed. The inner sleeve is machined with threads and moves relative to the threaded bearing support sleeve, pushing the entire upper rotary drum to move axially.

[0003] After a period of use, flying shears will experience blade wear, leading to excessive blade clearance. Adjusting the blade clearance involves axial movement of the rotating hub, as described above. However, after adjusting the tail blade clearance to meet requirements, the head blade clearance often becomes smaller, causing blade biting. Similarly, adjusting the head blade clearance alone may result in excessive tail blade clearance, and if not adjusted promptly, this can cause strip sticking during shearing, potentially halting rolling production. Therefore, the head and tail blade clearances cannot be adjusted separately, which is a challenging problem encountered in hot continuous rolling mill rotating hub flying shear production. Summary of the Invention

[0004] The purpose of this invention is to provide a method for adjusting the blade gap of a hot continuous rolling mill rotary hub flying shear, which solves the problem that the blade gap between the head and tail of the hot continuous rolling mill rotary hub flying shear cannot be adjusted independently, extends the service life of the flying shear, improves the shearing accuracy of the finishing mill flying shear, and reduces the failure of tail adhesion of the flying shear on the production line.

[0005] The technical solution adopted by the present invention to achieve the above objectives is as follows:

[0006] A method for adjusting the shear blade gap of a hot continuous rolling mill rotary drum flying shear includes the following steps:

[0007] S1. The blade gap of the flying shear head is adjusted by moving the rotating hub axially through the flying shear blade gap adjustment mechanism, so that the blade gap of the flying shear head meets the management standard gap value.

[0008] S2. After adjusting the blade gap of the flying shear head, the blade gap of the flying shear tail is adjusted by grinding the L-shaped liner of the flying shear tail blade. The steps include:

[0009] S21. Accurately measure the clearance between the tail blades of the flying shear according to the flying shear usage procedure;

[0010] S22. Calculate the deviation value of the tail shear blade clearance of the flying shear based on the actual clearance between the tail shear blades and the management standard clearance value;

[0011] S23. Remove the upper or lower cutting blade of the flying shear and grind the clamping part on the biting side of the blade. The grinding amount is consistent with the blade gap deviation value obtained in step S22.

[0012] S24. After installing the ground shear blades into place, measure the gap between the tail shear blades of the flying shear again to ensure it meets the management standard gap value. Then, proceed with normal production and use, and check the performance of the tail shear blades of the flying shear.

[0013] S25. After confirming that the grinding amount of the shear blade meets the production requirements, during the maintenance time, remove the grinding-processed side of the flying shear tail blade, remove the L-shaped liner plate in the mounting groove of the flying shear tail blade, and grind the contact surface between the L-shaped liner plate and the flying shear tail blade. The grinding amount is the same as the grinding amount of the flying shear tail blade.

[0014] After the L-shaped liner is ground, reinstall the L-shaped liner into the mounting slot of the flying shear tail blade. Then reinstall the normally used, unground blade and measure the gap between the flying shear tail blades to ensure it meets the management standard gap value. Proceed with normal production and check the blade performance.

[0015] Furthermore, in step S23, multiple grinding trials are conducted. Each time the flying shear blade is ground, the grinding amount is controlled to be less than or equal to 0.05mm until the gap between the flying shear tail blades meets the management standard gap value. At the same time, the upper and lower tail blades do not bite after meshing.

[0016] Furthermore, in step S25, before grinding the L-shaped liner, the grinding amount of the L-shaped liner is adjusted according to the existing wear amount of the L-shaped liner.

[0017] The beneficial effects of the method of this invention are as follows: by first grinding the shear blade to find the appropriate grinding amount, and then quantitatively grinding the L-shaped liner, the adjustment efficiency is improved. At the same time, this shear blade gap adjustment method effectively solves the problems of excessive shear blade gap at the head and tail and the inability to adjust them separately, as well as the sticking of the strip tail. It improves the adjustment efficiency of the flying shear blade gap and the service life of the flying shear, reduces the downtime of the rolling mill caused by abnormal shear cutting, and enhances the rolling mill's ability to control the quality of finished products. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the installation of the shear blade of the hot continuous rolling hub flying shear head of the present invention;

[0019] Figure 2 This is a schematic diagram of the installation of the tail shear blade of the hot continuous rolling hub flying shear of the present invention;

[0020] In the diagram: 1. Upper cutting head blade; 2. Lower cutting head blade; 3. Gap between cutting head blades; 4. Upper tail cutting blade; 5. Lower tail cutting blade; 6. Gap between tail cutting blades; 7. Clamping part where the blades bite together; 8. L-shaped liner; 9. Contact surface. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings:

[0022] A method for adjusting the shear blade gap of a hot continuous rolling mill rotary drum flying shear includes the following steps:

[0023] S1. The blade gap of the flying shear head is adjusted by moving the rotating hub axially through the flying shear blade gap adjustment mechanism, so that the blade gap of the flying shear head meets the management standard gap value.

[0024] like Figure 1 and Figure 2 As shown, according to the flying shear usage procedure, the cutting blade gap 3 between the upper cutting blade 1 and the lower cutting blade 2 is measured. For any deviation in the cutting blade gap 3, the flying shear blade gap is adjusted to meet the management standard gap value by axially moving the rotating hub through the flying shear blade gap adjustment mechanism.

[0025] Since the upper tail cutting blade 4 and the lower tail cutting blade 5 also move relative to each other during the adjustment of the blade gap of the flying shear head, the tail cutting blade gap 6 needs to be adjusted separately.

[0026] S2. After adjusting the blade gap of the flying shear head, the blade gap of the flying shear tail is adjusted by grinding the L-shaped liner of the flying shear tail blade. Figure 2 As shown, it includes the following steps:

[0027] S21. Accurately measure the clearance between the tail blades of the flying shear according to the flying shear usage procedure.

[0028] S22. Calculate the deviation value of the gap between the upper tail cutting blade 4 and the lower tail cutting blade 5 based on the actual flying shear tail blade gap 6 and the management standard gap value.

[0029] S23. Remove the upper cutting tail blade 4 or the lower cutting tail blade 5 of the flying shear, and grind the clamping part 7 on the biting side of the blade. The grinding amount is consistent with the blade gap deviation value obtained in step S22.

[0030] S24. After installing the ground shear blades into place, measure the gap between the tail shear blades of the flying shear again to ensure it meets the management standard gap value. Then, proceed with normal production and use, and check the performance of the tail shear blades of the flying shear.

[0031] This step can be done by grinding and testing multiple times. Each time the shear blade is ground, the grinding amount is controlled to be less than or equal to 0.05mm until the gap 6 between the tail shear blades of the flying shear meets the management standard gap value. At the same time, ensure that the upper tail shear blade 4 and the lower tail shear blade 5 do not bite after they are engaged.

[0032] S25. After confirming that the grinding amount of the shear blade meets the production requirements, remove the grinding-processed side of the flying shear tail blade during maintenance time, remove the L-shaped liner 8 from the mounting groove of the flying shear tail blade, and grind the contact surface 9 of the L-shaped liner 8 that is in contact with the flying shear tail blade. The grinding amount is the same as the grinding amount of the flying shear tail blade. Before grinding the L-shaped liner 8, the existing wear of the L-shaped liner 8 needs to be considered to provide a basis for grinding the L-shaped liner 8.

[0033] After grinding of S26 and L-shaped liner 8, reinstall L-shaped liner 8 into the mounting slot of the flying shear tail blade. Then reinstall the normally used, unground blade and measure the gap between the flying shear tail blades to ensure it meets the management standard gap value. Proceed with normal production and check the blade performance.

[0034] After adjusting the flying shear blade clearance using the above method, you can periodically check the flying shear blade clearance according to the flying shear maintenance requirements, and promptly adjust the blade clearance if it does not meet the management standard value using the above method.

Claims

1. A method for adjusting the shear blade gap of a hot continuous rolling mill rotary hub-type flying shear, characterized in that: Includes the following steps: S1. The blade gap of the flying shear head is adjusted by moving the rotating hub axially through the flying shear blade gap adjustment mechanism, so that the blade gap of the flying shear head meets the management standard gap value. S2. After the shear blade gap of the flying shear head is adjusted, the gap of the flying shear tail blade is adjusted by grinding the L-shaped liner of the flying shear tail blade, including: S21. Accurately measure the clearance between the tail blades of the flying shear according to the flying shear usage procedure; S22. Calculate the deviation value of the tail shear blade clearance of the flying shear based on the actual clearance between the tail shear blades and the management standard clearance value; S23. Remove the upper or lower cutting blade of the flying shear and grind the clamping part on the biting side of the blade. The grinding amount is consistent with the blade gap deviation value obtained in step S22. S24. After installing the shear blades that have been ground in step 23 into place, measure the gap between the tail shear blades of the flying shear again to ensure that it meets the management standard gap value. Then, proceed with normal production and use and check the performance of the tail shear blades of the flying shear. S25. After confirming that the grinding amount of the shear blade meets the production requirements, during the maintenance time, remove the grinding-processed side of the flying shear tail blade, remove the L-shaped liner plate in the mounting groove of the flying shear tail blade, and grind the contact surface between the L-shaped liner plate and the flying shear tail blade. The grinding amount is the same as the grinding amount of the flying shear tail blade. After the L-shaped liner is ground, reinstall the L-shaped liner into the mounting slot of the flying shear tail blade. Then reinstall the normally used, unground blade and measure the gap between the flying shear tail blades to ensure it meets the management standard gap value. Proceed with normal production and check the blade performance.

2. The method for adjusting the shear blade gap of a hot continuous rolling mill rotary hub-type flying shear according to claim 1, characterized in that: In step S23, the shear blade is ground using a multi-grind trial setup method. Each time the flying shear blade is ground, the grinding amount is controlled to be less than or equal to 0.05mm until the gap between the flying shear tail blades meets the management standard gap value. At the same time, the upper and lower tail blades do not bite after meshing.

3. The method for adjusting the blade gap of a hot continuous rolling mill rotary hub-type flying shear according to claim 1, characterized in that: Before grinding the L-shaped liner in step S25, the grinding amount of the L-shaped liner is adjusted according to the existing wear amount of the L-shaped liner.

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