A method for adaptive positioning and operation control of support roller balance cylinder

Abstract

This invention relates to the field of automatic control technology for steel rolling, and particularly to a method for adaptive positioning and operation control of a support roll balance cylinder, comprising: 1) during the roll drawing process, reading the preset distance of the support roll balance cylinder's descent gap, setting the target position for the descent of the support roll balance cylinder, and determining the relationship between the target position and the minimum allowable descent position of the support roll balance cylinder; 2) during the roll loading process, reading the preset distance of the support roll balance cylinder's descent gap and the set data of the stepped pad thickness, setting the target position for the descent of the support roll balance cylinder, and determining the relationship between the target position and the minimum descent position of the support roll balance cylinder. The advantages of this invention are: by automatically positioning and controlling the stroke of the support roll balance cylinder, the descent distance and target position of the support roll balance cylinder can be accurately determined, effectively avoiding the traditional full-stroke operation mode, only descending the necessary distance, shortening the extension and retraction operation time of the support roll balance cylinder, and thus significantly improving roll changing efficiency.

Description

Technical Field

[0001] This invention relates to the field of automatic control technology for steel rolling, and in particular to a method for adaptive positioning and operation control of a support roller balance cylinder. Background Technology

[0002] In the roll changing process of a hot strip mill finishing mill, the lifting and lowering control of the support roll balancing hydraulic cylinder is a critical step, directly affecting roll changing efficiency, equipment safety, and the service life of mechanical components. Traditional control methods typically employ a full-stroke operation mode, where the support roll balancing hydraulic cylinder extends and retracts to its maximum stroke position with each movement. This method has the following problems:

[0003] 1. Long roller changing time:

[0004] The support roller balancing hydraulic cylinder takes a long time to run at full stroke, resulting in low overall roller changing efficiency and affecting production rhythm;

[0005] 2. The impact of differences in the thickness of the stepped pad:

[0006] The thickness of the stepped pads that are matched with different work rollers is not consistent. If full stroke control is used, the actual distance required for each lifting and lowering of the support roller balance cylinder is different. Traditional methods cannot adaptively adjust this distance, resulting in wasted time or insufficient action.

[0007] 3. Risks of mechanical wear and interference:

[0008] Long-term full-stroke operation exacerbates the mechanical wear between the AGC cylinder and the positioning block of the stepped pad frame, resulting in an increased fit clearance. When the support roller balance cylinder descends to the lowest position, it may cause the AGC cylinder to detach from the stepped pad frame, or even cause the stepped pad to fail to be accurately positioned due to mechanical interference, affecting the stability of roller changing.

[0009] 4. Insufficient positioning accuracy:

[0010] Traditional methods lack the ability to dynamically adapt to actual working conditions (such as the thickness of the step pad and the wear condition of the equipment), which can easily lead to equipment collisions or positioning deviations. Summary of the Invention

[0011] The purpose of this invention is to provide a method for adaptive positioning and operation control of the support roll balance cylinder, which improves roll changing efficiency, reduces mechanical wear, and avoids the risk of interference from other mechanical structures in the finishing mill.

[0012] To achieve the above objectives, the present invention provides the following technical solution:

[0013] A method for adaptive positioning and operation control of a support roller balance cylinder, characterized in that it includes:

[0014] 1) During the roller pulling process, save the current position information of the support roller balance cylinder, read the distance of the preset support roller balance cylinder descent gap, and set the target position for the descent of the support roller balance cylinder;

[0015] The target position for the descent of the support roller balance cylinder is determined by the following formula:

[0016] S = P - X1 ①

[0017] In formula ①, X1 represents the distance of the descending gap of the support roller balance cylinder, P represents the current position of the support roller balance cylinder recorded by the magnetic ruler, and S represents the target position of the descending support roller balance cylinder.

[0018] Determine the relationship between the target position of the support roller balance cylinder's descent and the minimum allowable descent position L of the support roller balance cylinder:

[0019] If S≤L, then set S=L;

[0020] 2) During the roller loading process, save the current position information of the support roller balance cylinder, read the preset distance of the support roller balance cylinder descent gap and the set data of the stepped pad thickness, and set the target position for the descent of the support roller balance cylinder.

[0021] The target position for the descent of the support roller balance cylinder is determined by the following formula:

[0022] S = PT - X2 ②

[0023] In Formula ②, T represents the thickness of the step pad, which is the thickness of the step pad set when the corresponding rolling mill is loading the rolls; X2 represents the distance of the descending gap of the support roll balance cylinder;

[0024] Determine the relationship between the target position of the support roller balance cylinder's descent and the lowest position L of the support roller balance cylinder's descent:

[0025] If S≤L, then S=L.

[0026] The magnetic scale is used to monitor the position information of the support roller balance cylinder in real time.

[0027] When the descent starts, the support roller balance cylinder automatically saves the current position information of the support roller balance cylinder.

[0028] The distance the support roller balance cylinder descends is set independently during the roller pulling process and the roller loading process.

[0029] Configure and set the descent distance of the support roller balance cylinder according to the specifications and thickness of the stepped pad.

[0030] Compared with the prior art, the beneficial effects of the present invention are:

[0031] 1. This invention, through automatic positioning and operation control of the support roll balance cylinder stroke, can accurately determine the descent distance and target position of the support roll balance cylinder, effectively avoiding the traditional full-stroke operation mode, and only lowering the cylinder by the necessary distance (e.g., 20mm), thus shortening the extension and retraction operation time of the support roll balance cylinder, thereby significantly improving roll changing efficiency, reducing production interruption time caused by excessive roll changing time, and improving the production efficiency of the entire hot strip finishing mill.

[0032] 2. Dynamically adapt to changes in the thickness of the stepped pad: During the loading process, the target position (S = PT - X2) is automatically adjusted according to the actual thickness of the stepped pad (e.g., 80mm) to avoid redundancy or insufficiency of action caused by a fixed stroke, ensuring precise positioning;

[0033] 3. In the traditional roller changing process, due to mechanical wear of the equipment, the gap between the AGC cylinder and the bracket on the stepped pad frame is easily too large. This causes the AGC cylinder to separate from the stepped pad frame when the support roller descends to the lowest position. At the same time, the interference between the mechanical structures prevents the stepped pad from moving to the designated position. By verifying the target descent position (S>L) and reserving a safety gap, the AGC cylinder and the stepped pad frame are prevented from separating due to excessive descent. This effectively reduces the mechanical wear in the vertical direction, thereby reducing the mechanical wear between the AGC cylinder and the stepped pad device in the vertical direction, extending the service life of the equipment, and reducing the maintenance cost of the equipment.

[0034] 4. Verify the relationship between the target position and the lowest position (L) to ensure that the support roller balance cylinder operates within a safe range, eliminate the risk of interference when the stepped pad moves, and ensure a smooth and reliable roller changing process;

[0035] 5. During the roller pulling and roller loading processes, this invention accurately calculates and sets the descent distance and target position of the support roller balance cylinder based on the real-time feedback position signal (P) from the current magnetic scale, combined with preset parameters (X1, X2, T, L). At the same time, the descent target position is verified to ensure that it meets certain safety conditions. Compared with the traditional manual experience judgment or fixed control mode, this automatic positioning control method can more accurately control the operation of the support roller balance cylinder, enhancing control accuracy and reliability.

[0036] 6. By precisely setting the target descent position of the support roller balance cylinder and ensuring it is within a safe range, equipment failures and damage caused by mechanical interference are effectively avoided. During the roller loading process, the target descent position is calculated based on the thickness of the step pad, ensuring that the step pad can move smoothly to the designated position without collision or jamming due to improper descent position of the support roller balance cylinder. This ensures the smooth progress of the roller changing process and improves the stability and safety of equipment operation.

[0037] 7. This invention is applicable to step pads and support roller balancing systems of different specifications. It can be adapted to various working conditions by simply adjusting preset parameters (such as X1, X2, T, L), and has strong scalability. Attached Figure Description

[0038] Figure 1 This is a flowchart of the adaptive positioning and operation control of the support roller balance cylinder.

[0039] Figure 2 It shows the stroke curves of the support roller balance cylinder before and after the modification.

[0040] Figure 3 This is a diagram showing the positional relationship between the AGC hydraulic cylinder lever T-head and the stepped pad fixing frame.

[0041] Figure 4 This is a mechanical structure diagram of a finishing mill.

[0042] In the diagram: 1. Pressure plate; 2. Fixed frame; 3. T-shaped frame head; 4. Bracket; 5. Adjusting pad. Detailed Implementation

[0043] The present invention will now be described in detail with reference to the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0044] The following embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operation processes. However, the scope of protection of the present invention is not limited to the following embodiments. Unless otherwise specified, the methods used in the following embodiments are conventional methods.

[0045] Example 1

[0046] See Figure 1 A method for adaptive positioning and operation control of a support roll balance cylinder is disclosed, used for the balance lifting and lowering control of the support roll during the hot continuous rolling finishing process. The method employs a magnetic scale to monitor the position information of the support roll balance cylinder in real time, and specifically includes the following:

[0047] 1) The target position for the descending of the support roller balance cylinder during the roller pulling process is determined by the following formula:

[0048] S = P - X1 ①

[0049] In formula ①, X1 represents the distance of the descending gap of the support roller balance cylinder, X1 = 20mm; P represents the current position of the support roller balance cylinder recorded by the magnetic ruler; S represents the target position of the descending support roller balance cylinder.

[0050] The target position of the support roller balance cylinder's descent is verified, and the relationship between the target position and the minimum allowable descent position L of the support roller balance cylinder is determined. This is to prevent the AGC hydraulic cylinder T-shaped frame head 3 from separating from the fixed frame 2. The range of the support roller balance cylinder's descent gap is set to 0-53mm, 0-46mm, 0-36mm, and 0-43mm. The descent distance of the support roller balance cylinder is set independently during the roller pulling and roller loading processes; see [link to relevant documentation]. Figure 3 , Figure 4 :

[0051] If S≤L, then set S=L.

[0052] 2) The target position for the descending of the support roller balance cylinder during the roller loading process is calculated using the following formula:

[0053] S = PT - X2 ②

[0054] In Formula ②, T represents the thickness of the step pad, which is the thickness of the step pad set when the rolling mill is loading the rolls; T = 80mm, X2 = 4mm;

[0055] The finishing mill adopts a 7-stand continuous rolling process. Each finishing mill is equipped with one set of upper step pad device. The fixed frame specifications of the step pads of each finishing mill are the same. There are four specifications of step pads, each with three thickness steps, which can slide to the designated step position within the fixed frame: the first thickness step is 60mm, 70mm, and 80mm; the second thickness step is 40mm, 64mm, and 87mm; the third thickness step is 50mm, 73mm, and 97mm; and the fourth thickness step is 70mm, 80mm, and 90mm.

[0056] The maximum thickness values ​​for the four structures of the finishing mill step pad are: 80mm, 87mm, 97mm, and 90mm.

[0057] Vertical distance within the fixed frame: Distance from top of fixed frame to bottom of bracket - thickness of bearing plate - thickness of bracket - thickness of T-shaped frame head - thickness of adjusting pad = 338 - 65 - 60 - 60 - 20 = 133mm.

[0058] The target position of the support roller balance cylinder's descent is verified, and the relationship between the target position and the lowest position L of the support roller balance cylinder's descent is determined to prevent the AGC cylinder T-shaped frame head from separating from the stepped pad 2 fixed frame.

[0059] If S≤L, then S=L.

[0060] The lowest position of the support roller balance cylinder L = the highest mechanical position of the support roller rising in balance - the vertical distance in the space inside the fixed frame = 394 - 133 = 261mm.

[0061] Example 2

[0062] In this embodiment, the method for adaptive positioning and operation control of the support roller balance cylinder is the same as in Embodiment 1, except that an adaptive positioning and operation control process for the support roller balance cylinder is added.

[0063] Before modification: see Figure 2 Modify the operating curve of the support roller balance cylinder;

[0064] 1) During the roll pulling process, the support roll balance descent starts at 6:21. The support roll balance descents to the lowest point of the full stroke position, 153mm (error -6 to +4). After the support roll balance descents to the position, the step pad moves from the working position to the roll changing position. After the step pad is in place, the support roll balance rises to the highest mechanical position, 396mm.

[0065] 2) During the roll loading process, the support roll balance descent starts at 6:37. The support roll balance descents to the lowest point of the full stroke position, 153mm (error -6 to +4). After the support roll balance descents to the position, the step pad moves from the roll changing position to the working position. After the step pad is in place, the support roll balance rises to the highest mechanical position, 316mm.

[0066] Revised version: See Figure 2 Modified operating curve of the support roller balance cylinder;

[0067] 3) During the roller pulling process, the support roller balance descent starts at 21:46. The support roller balance descends from 316mm to the set point of 296mm (error -6 to +4). After the support roller balance descends to the set point, the step pad moves from the working position to the roller changing position. After the step pad is in place, the support roller balance rises to the highest mechanical position of 396mm.

[0068] 4) During the roll loading process, the support roll balance descent starts at 21:54 and the support roll descends to the set point of 312mm; after the support roll balance descent is in place, the step pad moves from the roll changing position to the working position; after the step pad is in place, the support roll balance rises to the highest mechanical position of 316mm.

[0069] This invention, through automatic positioning and operation control of the support roll balance cylinder stroke, can accurately determine the descent distance and target position of the support roll balance cylinder, effectively avoiding the traditional full-stroke operation mode. It only descents the necessary distance (e.g., 20mm), shortening the extension and retraction time of the support roll balance cylinder, thereby significantly improving roll changing efficiency, reducing production interruption time caused by excessive roll changing time, and increasing the overall production efficiency of the hot strip finishing mill. It also dynamically adapts to changes in the thickness of the stepped pad: during the roll loading process, the target position (S = PT - X2) is automatically adjusted according to the actual thickness of the stepped pad (e.g., 80mm), avoiding redundancy caused by a fixed stroke. To ensure precise positioning, whether there is excess or deficiency, in traditional roller changing processes, due to mechanical wear, the gap between the AGC cylinder and the bracket on the stepped pad frame can easily become too large. This causes the AGC cylinder to separate from the stepped pad frame when the support roller descends to its lowest position, and interference between mechanical structures prevents the stepped pad from moving to the designated position. By verifying the descent target position (S>L) and reserving a safety gap, the AGC cylinder and stepped pad frame are prevented from separating due to excessive descent, effectively reducing vertical mechanical wear. This, in turn, reduces vertical mechanical wear between the AGC cylinder and the stepped pad device, extends the equipment's service life, and reduces maintenance costs. The relationship between the target position and the lowest position (L) is verified to ensure that the support roller balance cylinder operates within a safe range, eliminating the risk of interference when the stepped pad moves and ensuring a smooth and reliable roller changing process. During the roller pulling and loading processes, this invention accurately calculates and sets the descent distance and target position of the support roller balance cylinder based on the real-time feedback position signal (P) from the current magnetic scale, combined with preset parameters (X1, X2, T, L). Simultaneously, the descent target position is verified to ensure it meets certain safety conditions. Compared to traditional manual experience-based judgment or fixed control modes, this automatic positioning control method can more accurately control the operation of the support roller balance cylinder, enhancing… This system ensures control precision and reliability. By precisely setting the target descent position of the support roller balance cylinder and ensuring it remains within a safe range, it effectively avoids equipment malfunctions and damage caused by mechanical interference. During the roller loading process, the target descent position is calculated based on the thickness of the stepped pad, ensuring that the stepped pad can move smoothly to the designated position without collision or jamming due to improper descent of the support roller balance cylinder. This guarantees a smooth roller changing process and improves the stability and safety of equipment operation. It is applicable to stepped pads and support roller balancing systems of different specifications. Only preset parameters (such as X1, X2, T, L) need to be adjusted to adapt to various working conditions, making it highly versatile.

Claims

1. A method for adaptive positioning and operation control of a support roller balance cylinder, characterized in that, include: 1) During the roller pulling process, save the current position information of the support roller balance cylinder, read the distance of the preset support roller balance cylinder descent gap, and set the target position for the descent of the support roller balance cylinder; The target position for the descent of the support roller balance cylinder is determined by the following formula: S = P - X1 ① In formula ①, X1 represents the distance of the descending gap of the support roller balance cylinder, P represents the current position of the support roller balance cylinder recorded by the magnetic ruler, and S represents the target position of the descending support roller balance cylinder. Determine the relationship between the target position of the support roller balance cylinder's descent and the minimum allowable descent position L of the support roller balance cylinder: If S≤L, then set S=L; 2) During the roller loading process, save the current position information of the support roller balance cylinder, read the preset distance of the support roller balance cylinder descent gap and the set data of the stepped pad thickness, and set the target position for the descent of the support roller balance cylinder. The target position for the descent of the support roller balance cylinder is determined by the following formula: S = PT - X2 ② In Formula ②, T represents the thickness of the step pad, which is the thickness of the step pad set when the corresponding rolling mill is loading the rolls; X2 represents the distance of the descending gap of the support roll balance cylinder; Determine the relationship between the target position of the support roller balance cylinder's descent and the lowest position L of the support roller balance cylinder's descent: If S≤L, then S=L.

2. The method for adaptive positioning and operation control of a support roller balance cylinder according to claim 1, characterized in that, The magnetic ruler is used to monitor the position information of the support roller balance cylinder in real time.

3. The method for adaptive positioning and operation control of a support roller balance cylinder according to claim 1, characterized in that, When the descent starts, the support roller balance cylinder automatically saves the current position information of the support roller balance cylinder.

4. The method for adaptive positioning and operation control of a support roller balance cylinder according to claim 1, characterized in that, The distance the support roller balance cylinder descends is set independently during the roller pulling process and the roller loading process.

Images