CN102962262B - Roll changing method for preventing working roll traveling wheels from being damaged - Google Patents

Abstract

The invention provides a method of changing rolls which avoids the damage of the running wheels of the working rolls. In the TDC, a roll gap position control program and a roll diameter storage, comparison and calculation module are added; when changing rolls, the lower working roll is first dropped to the set reserved roll gap position, then drop the upper work roll onto the lower work roll, lift the upper work roll after pulling out the wedge, and after changing the roll, raise the lower work roll to the position where the reserved roll gap plus the difference between the new and old roll diameters is added , drop the upper work roll onto the lower work roll, and then lift the upper work roll and the upper back-up roll together after the wedge is driven in. The invention utilizes the upper hydraulic cylinder to support the weight of each part of the roller system of the frame, decomposes the roller weight of the backup roller, thereby reducing the pressure on the running wheel of the work roll bearing box, avoiding damage to the running wheel of the working roll, prolonging the service period of the running wheel, and reducing maintenance Reduce workload and spare parts consumption, reduce maintenance costs and production costs, shorten roll changing time, and increase unit productivity.

Description

A Roll Changing Method for Avoiding Damage to Work Roll Traveling Wheel

technical field

The invention belongs to the field of steel rolling machinery equipment, and in particular relates to a method for changing rolls of a cold rolling mill which can prevent damage to running wheels of work rolls during the roll changing process.

Background technique

At present, there are two running wheels on both sides of the work roll bearing box of the domestic 2130 mm cold rolling unit, which are used for the push-pull movement of the work roll during the roll change process. Wedge, when the balance of the upper back-up roll falls, because the balance cylinder rod of the back-up roll is too long, the weight of the upper back-up roll (about 40 tons) directly presses on the bearing box of the upper work roll, and the running wheels of the bearing box are in direct contact with the track. Small but strong pressure, resulting in excessive force between the traveling wheel and the track, causing the traveling wheel to deform and damage. After the new work roll enters the frame, the rolling line is calibrated for the opening of the wedge, the balance of the upper back-up roll drops again, and the entire weight of the upper back-up roll is completely pressed on the bearing box of the new work roll, which also causes damage to the running wheel of the new roll. After such repeated stamping twice, the 8 running wheels of the upper work roll are basically damaged. In severe cases, the bearing box of the work roll will be stuck, so that the roll change of the work roll cannot be carried out normally, and the processing time is longer, which affects the roll change time of the unit. and the operating rate of the unit. At the same time, the long-term shutdown of the unit will lead to overwashing of the steel plate in the pickling section, resulting in a large number of waste products and hidden dangers of belt breakage. Although measures such as changing the structural strength and material of the walking wheel have been taken many times, there is no obvious effect. Therefore, it is necessary to reduce the direct pressure impact on the running wheel of the work roll bearing box when the balance of the upper back-up roll is lowered. From the aspect of decomposing the pressure of the upper back-up roll, the force on the running wheel of the work roll bearing box can be reduced to avoid damage to the running wheel.

Contents of the invention

The purpose of the present invention is to provide a simple and easy, no investment, using the support function of the lower work roll, the lower back-up roll and the balance hydraulic cylinder to decompose the pressure impact on the work roll bearing box deformation wheel when the back-up roll is balanced down, Thereby avoiding the method of changing the rollers of the traveling wheel damage.

For this reason, the technical solution that the present invention takes is:

A method for changing rolls to avoid damage to the running wheels of work rolls, including a rolling mill technology and transmission controller (TDC for short), the specific method and steps are:

(1) A roll gap position control program including on-site signals, position setting of the upper and lower work rolls and backup rolls, controller output and set position verification is added to the TDC, and a roll diameter storage module and a roll diameter comparison calculation module are added; And set the manual selection button on the console;

(2) When changing rolls, the operator presses the manual selection button, and the roll gap position control program in TDC controls the lower working roll and the lower back-up roll to drop to the set reserved roll gap position, and check and check;

(3) After confirming that the lowering position is correct, drop the upper work roll onto the lower work roll, and then lower the upper back-up roll onto the upper work roll;

(4) After the wedge is driven out to the open position, the upper back-up roll and upper work roll are raised respectively, and the lower back-up roll and lower work roll are dropped to the lowest position;

(5) Pull out the upper and lower work rolls with a roll changer, and replace them with new upper and lower work rolls;

(6) The operator presses the manual selection button, and the roll diameter comparison calculation module in the TDC compares and calculates the old roll diameter stored in the roll diameter storage module and the newly input new roll diameter, and compares the new and old roll diameters The difference between them is added to the roll gap position control program, and the roll gap position control program controls the lower work roll and the lower back-up roll to lift to the set reserved roll gap plus the difference between the new and old roll diameters;

(7) Drop the upper work roll onto the lower work roll, and then drop the upper back-up roll onto the upper work roll;

(8) After the wedge is driven in, the upper working roll and the upper back-up roll are lifted together, and the roll change is completed.

The set reserved roll gap is 7-9mm.

The beneficial effects of the present invention are:

Since the present invention adds a roll gap position control program in the roll changing process, the function of opening and setting the reserved roll gap position is realized, and the pressing system of the rolling mill is used to realize that the upper and lower work rolls are in contact with each other when the balance of the upper back-up roll is lowered. The hydraulic cylinder supports the weight of the roller system in each part of the frame, and decomposes the roller weight of the backup roller, thereby reducing the direct pressure impact on the running wheel of the work roll bearing box, avoiding the deformation and damage of the running wheel of the working roll, and not only greatly reducing the maintenance workload and spare parts Consumption, reducing maintenance costs; and prolonging the service life of the traveling wheel, reducing production costs; at the same time, it can relatively shorten the roll changing time, improve the operating rate of the unit and the system capacity.

Detailed ways

The roll changing method of the present invention avoids the damage of the work roll running wheel, mainly utilizes the support function of the lower work roll, the lower back-up roll and the balance hydraulic cylinder to decompose the pressure impact on the work roll bearing box running wheel when the back-up roll is balanced down, thereby The purpose of avoiding damage to the traveling wheel is achieved.

The specific methods and steps are:

1. First add the roll gap position control program to the TDC, including on-site signals, position setting of the upper and lower work rolls and backup rolls, controller output and set position verification functions; and add a roll diameter storage module and roll rolls to the TDC diameter comparison calculation module; at the same time, a manual selection button is set on the console.

2. When changing rolls, the operator presses the manual selection button, and the roll gap position control program in the TDC controls the lower working roll and the lower back-up roll to drop to the set reserved roll gap position, that is, the original lower working roll and lower back-up roll will be changed. The back-up roll is lowered to the lowest position at one time, and a roll gap of 8 mm is left between the upper and lower work rolls, and the reaching position is verified and rechecked.

3. After the roll gap position control program confirms that the lowering position is correct, drop the upper work roll onto the lower work roll so that the upper and lower work rolls are in direct contact, and then drop the upper back-up roll onto the upper work roll.

4. After the wedge is driven out to the open position, the upper back-up roll and upper work roll are raised respectively, and the lower back-up roll and lower work roll are lowered to the lowest position.

5. Pull out the upper and lower working rolls with a roll changing car, and replace them with new upper and lower working rolls.

6. The operator presses the manual selection button, and the roll diameter comparison calculation module in the TDC compares and calculates the old roll diameter stored in the roll diameter storage module and the newly input new roll diameter, and calculates the difference between the new and old roll diameters. The difference is added to the roll gap position control program, and the roll gap position control program controls the lifting of the lower work roll and the lower back-up roll to the set reserved roll gap of 8 mm plus the difference between the new and old roll diameters. Since the diameter of the new roller may be larger or smaller than the diameter of the old roller, the difference between the new and old roller diameters may be positive or negative, so set After the reserved roll gap is 8 mm and the difference between the new and old roll diameters is added, the result may be greater than 8 mm or less than 8 mm. The purpose of its adjustment is to ensure that the upper work roll can just fall on the lower work roll after it descends.

7. Drop the upper work roll onto the lower work roll, and then drop the upper back-up roll onto the upper work roll.

8. After the wedge is driven in, the upper working roll and the upper backup roll are lifted together, and the roll change is completed.

Since the present invention adds the function of opening and setting the reserved roll gap position by one step in the roll changing process, the pressing system is used to realize that the upper and lower work rolls are in contact with each other when the upper back-up roll balances down, and the pressing hydraulic cylinder is used to support the roll system of each part of the frame. Weight, so as to realize the decomposition of the roll weight of the upper back-up roll, which can greatly reduce the direct pressure stamping of the running wheel of the work roll bearing box.

The invention reasonably sets the position of the pressing system to open the roll gap in one step, so that it can not only meet the requirements of decomposing the roll weight of the backup roll, reduce the pressure between the running wheel and the track of the working roll bearing box, effectively protect the running wheel, and at the same time ensure the safety of the machine frame. The gap between the mechanical structures ensures the normal operation of changing rolls.

Considering that the new roll enters the frame during the roll change process and the new roll data is not written into the position controller, the contact roll gap setting is inconsistent with the actual roll diameter contact roll gap at this time, so a roll diameter storage module and a roll diameter comparison module are added for this purpose. The calculation module compares the deviation of the stored new and old roll systems, and adds the difference to the roll gap position control program, realizing the self-adaptive function of the new roll gap position.

Claims (2)

1. A roll-changing method for avoiding work roll traveling wheel damage, comprising rolling mill technology and transmission controller i.e. TDC, is characterized in that, concrete method and steps are: (1) A roll gap position control program including on-site signals, position setting of the upper and lower work rolls and backup rolls, controller output and set position verification is added to the TDC, and a roll diameter storage module and a roll diameter comparison calculation module are added; And set the manual selection button on the console; (2) When changing rolls, the operator presses the manual selection button, and the roll gap position control program in TDC controls the lower working roll and the lower back-up roll to drop to the set reserved roll gap position, and check and check; (3) After confirming that the lowering position is correct, drop the upper work roll onto the lower work roll, and then lower the upper back-up roll onto the upper work roll; (4) After the wedge is driven out to the open position, the upper back-up roll and upper work roll are raised respectively, and the lower back-up roll and lower work roll are dropped to the lowest position; (5) Pull out the upper and lower work rolls with a roll changer, and replace them with new upper and lower work rolls; (6) The operator presses the manual selection button, and the roll diameter comparison calculation module in the TDC compares and calculates the old roll diameter stored in the roll diameter storage module and the newly input new roll diameter, and compares the new and old roll diameters The difference between them is added to the roll gap position control program, and the roll gap position control program controls the lower work roll and the lower back-up roll to lift to the set reserved roll gap plus the difference between the new and old roll diameters; (7) Drop the upper work roll onto the lower work roll, and then drop the upper back-up roll onto the upper work roll; (8) After the wedge is driven in, the upper working roll and the upper back-up roll are lifted together, and the roll change is completed. 2. The roll changing method for avoiding damage to the running wheel of the work roll according to claim 1, characterized in that the set reserved roll gap is 7-9 mm.