A method for controlling the sequence of front shears for improving the rolling rhythm

Abstract

The application discloses a method for controlling a guide plate queue before shearing to improve rolling rhythm, and a queue control CSG module is additionally arranged in a finish rolling TDC control unit to generate a guide plate control queue, so that the opening width setting value of the guide plate required by the next strip is obtained in advance, and then the guide plate control is started according to the control logic of the queue control CSG module, so that the new width setting is executed in advance, and the steel feeding block caused by the guide plate action not being in place is avoided. Through the introduction of the queue, the action of the guide plate before the flying shear is free from the restriction of whether the flying shear finishes the current strip tail cutting, the guide plate is pre-acted, the guide plate before the flying shear can be pre-acted to place according to the required opening degree when the width specification of the next strip is changed, the steel feeding block problem in the finish rolling area is avoided, the equipment failure shutdown caused by the strip being stuck in the guide plate area is eliminated, and the rolling rhythm of the production line is improved.

Description

Technical Field

[0001] This invention relates to hot rolling / finishing technology, and more specifically, to a method for controlling the pre-shear guide plate queue to improve rolling rhythm. Background Technology

[0002] The existing 2050 hot-rolled flying shear's guide plate is located in the finishing mill entrance area. Before the flying shear, it is used to correctly guide the strip from the roughing mill into the finishing mill flying shear, enabling the flying shear to complete the head and tail shearing of the roughing mill incoming material. The existing technical guide plate's on-site equipment layout and control are as follows: Figure 1 As shown, HMD01 is the photoelectric tube at the entrance of the finishing mill, the starting point of the guide plate before shearing, and returns signal 1 to the TDC control unit when strip passes through its detection point; CS is the flying shear, used to perform head and tail shearing of the roughing mill incoming material; L2 is the 2050 hot rolling process control computer, used for production line process control, and sends set values ​​to the finishing mill TDC control unit; L1 is the 2050 finishing mill basic automation system, including the TDC control unit, the finishing mill human-machine interface (HMI), and peripheral drives and detection equipment for the finishing mill automation equipment; CSG is the guide plate control module in the finishing mill TDC, which contains the existing technology program for controlling the guide plate movement; CSH is the flying shear control module in the finishing mill TDC, used for flying shear control and sending the opening width set value to the guide plate; SDH is the set value processing module in the finishing mill TDC, used to receive the width setting sent by L2 and respond to CSH requests to send the width setting to the CSH module.

[0003] The existing guide plate control process is described as follows: The finishing mill TDC control unit receives the width setting value from L2, executes the corresponding control program, and then sends an action command to the guide plate drive unit (guide plate transmission device) to either increase or decrease the guide plate opening. The drive unit drives the guide plate motor, which, through a gearbox, controls the guide plate to increase or decrease the opening value according to the drive command. A position encoder installed at the tail end of the guide plate motor feeds back the actual position information of the guide plate to the control unit. When the guide plate opening reaches the set position, the guide plate stops moving, and the finishing mill allows steel to enter.

[0004] In the existing finishing mill TDC unit, the three program blocks related to guide plate control are SDH, CSH, and CSG, and their control logic flow is as follows: Figure 2 As shown:

[0005] 1) When the strip head exits the roughing R4 mill, L2 sends the strip width setting to the finishing TDC control unit. The SDH in the TDC control unit receives and stores the strip width setting. After the CSH module sends a width setting request to it, the width setting value is sent to the CSH module.

[0006] 2) After the CSH controls the flying shear to complete the current strip tail cutting action, it requests the width setting of the next strip from the SDH. After receiving the setting, it sends the value as the guide plate opening width setting to the CSG module.

[0007] 3) If the head of the next strip does not enter the guide plate area (HMD01 = 0), the CSG module, after receiving the opening width setting from CSH, sends a command to the transmission unit to move the guide plate larger or smaller. If the head of the next strip enters the finishing rolling area (HMD01 = 1), then the steel feed is blocked.

[0008] 4) After receiving the command, the transmission unit controls the motor to move the guide plate to the set position via the gearbox. The control unit receives feedback on the actual position of the guide plate. When the guide plate moves to the set position, the strip is allowed to enter the finishing rolling area; otherwise, the steel feeding is blocked.

[0009] The following problems exist in controlling the guide plate's movement using the existing technology described above:

[0010] 1) After the automation capability is improved in 2050, it is allowed for two strips to exist simultaneously in the finishing mill entrance area. That is, before the end of the current strip is cut off, the next strip can enter HMD01. When the strip width specification changes, the guide plate opening width needs to be changed accordingly. However, because the current strip has not been cut off, CSH has not yet requested a new width setting from SDH, causing the guide plate to be unable to move in time, resulting in the finishing mill entry blockage and slowing down the rolling rhythm.

[0011] 2) When the width of the current strip varies greatly, even if there are no two strips in the finishing mill entrance area, if the CSH sends the guide plate opening width setting to the CSG after the flying shear has finished cutting the tail of the current strip, the guide plate will not have enough time to move due to the late time. The guide plate will not be able to reach the set position within the reserved time, resulting in the finishing mill entry being blocked and the rolling rhythm being slowed down.

[0012] 3) If the strip with a larger width is moving too fast and cannot respond to the strip blocking command to slow down, the next strip will rush into the guide plate area and get stuck in the guide plate that has not been opened properly, damaging the mechanical equipment on site and causing a shutdown. Summary of the Invention

[0013] To address the aforementioned deficiencies in existing technologies, the purpose of this invention is to provide a method for controlling the pre-shear guide plate queue to improve rolling rhythm. By introducing a queue, the movement of the flying shear guide plate is freed from the limitation of whether the flying shear has completed the cutting of the current strip tail, enabling the guide plate to move in advance. This ensures that when the width specification of the next strip changes, the flying shear guide plate can move into position in advance according to the required opening degree, avoiding the problem of steel entry blockage in the finishing rolling area and eliminating equipment failures and downtime caused by strip getting stuck in the guide plate area, thereby improving the rolling rhythm of the production line.

[0014] To achieve the above objectives, the present invention adopts the following technical solution:

[0015] A method for controlling the pre-shear guide plate queue to improve rolling rhythm involves adding a queue control (CSG) module to the finishing mill TDC control unit to perform the following steps:

[0016] S1. When the head of the strip exits the work roll R4, L2 sends the width setting value of the strip to the finishing TDC control unit, and the queue control CSG module reads the width setting value of the strip and stores it in the width tracking queue B2 position.

[0017] S2. The queue control CSG module determines whether the width tracking queue B1 position has been executed. If it has been executed, the original width tracking queue B1 position is removed from the queue, and the width tracking queue B2 position is moved up to the width tracking queue B1 position.

[0018] S3. The queue control CSG module compares the current strip width setting with the new setting of the width tracking queue B2 position to determine the direction of the guide plate's movement.

[0019] S4. If the width of the next strip is greater than the current strip width, the guide plate moves in the direction of increasing the opening; if the width of the next strip is less than the current strip width, the guide plate moves in the direction of decreasing the opening.

[0020] S5. After receiving the guide plate width setting value from the queue control CSG module, the CSG module controls the guide plate to move according to the setting before the head of the next strip reaches the first phototube. After the guide plate moves to the correct position, the next strip is allowed to enter the finishing mill; otherwise, the steel feed is blocked.

[0021] Preferably, a second phototube is added at the exit position of the flying shear guide plate to detect whether the tail of the strip has left the guide plate area.

[0022] Preferably, the second phototube is 3800-3900mm away from the flying shear.

[0023] Preferably, step S4 further includes:

[0024] If the width of the next strip is greater than the current strip width, the guide plate moves in the direction of increasing the opening width. It is determined whether the time since the tail of the current strip left the first phototube has reached more than 3 seconds. If it has, the queue control CSG module sends the setting value of the next strip width as the guide plate opening width setting value. If the width of the next strip is less than the current strip width, the guide plate moves in the direction of decreasing the opening width. It is determined whether the tail of the current strip has left the guide plate outlet, i.e., left the second phototube. If the tail of the strip has left, the queue control CSG module sends the setting value of the next strip width as the guide plate opening width setting value.

[0025] Preferably, in step S4, an enable switch is set on the queue control CSG module. When the enable switch is 1, the queue control CSG module sends the set values ​​generated in steps S3 and S4 to the CSG module.

[0026] The pre-shear guide plate queue control method for improving rolling rhythm provided by this invention has the following beneficial effects:

[0027] 1) After the width setting of the next strip is issued by L2, the queue control CSG module directly reads the setting value and stores it in the width queue B2 position for later use, no longer limited by whether the current strip tail cutting is completed;

[0028] 2) The newly added second phototube HMD02 at the guide plate exit position enables the detection of whether the tail of the strip has left the guide plate area, creating the hardware conditions for guide plate queue control;

[0029] 3) When the width of the next strip is greater than that of the current strip: After the guide plate receives the opening width setting of the next strip from the queue control CSG module, as long as the tail of the current strip leaves the first phototube HMD01 for more than 3 seconds, the guide plate will immediately move to the set position. The start time of the guide plate is no longer affected by whether the tail of the current strip has been cut off.

[0030] 4) When the width of the next strip is smaller than that of the current strip: After the guide plate receives the opening width setting of the next strip from the queue control CSG module, as long as the tail of the current strip leaves the second phototube HMD02, the guide plate will immediately move to the set position and the start time of the guide plate will no longer be affected by whether the tail of the current strip has been cut off.

[0031] 5) The pre-cutting guide plate queue control method of the present invention is equipped with an enable switch. When in use, the enable switch is set to 1. When you want to temporarily switch to the original method, you only need to set the function switch to 0.

[0032] 6) The shearing guide plate queue control method of the present invention significantly advances the start time of the shearing guide plate compared with the original method, effectively avoiding the blockage of the steel feed in the finishing mill caused by the guide plate not moving in place, and improving the rolling rhythm. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the existing guide plate equipment layout and control;

[0034] Figure 2 This is a schematic diagram of the control logic flow of an existing guide plate device;

[0035] Figure 3 This is a schematic diagram of the layout and control of the guide plate equipment in the guide plate queue control method of the present invention;

[0036] Figure 4 This is a schematic diagram of the control logic flow of the pre-cut guide plate queue control method of the present invention;

[0037] Figure 5 This is a screenshot of monitoring data from a PDA set 12.5 seconds earlier than the start time when the guide plate moves to a large position in an embodiment of the guide plate queue control method of the present invention.

[0038] Figure 6 This is a screenshot of monitoring data from a PDA set 5.82 seconds earlier than the start time when the guide plate moves to a smaller position, as shown in the embodiment of the guide plate queue control method of the present invention. Detailed Implementation

[0039] To better understand the above-mentioned technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0040] Combination Figure 3 and Figure 4 As shown, the present invention provides a method for controlling the pre-shear guide plate queue to improve rolling rhythm. First, a second photocell HMD02 is added at the exit position of the pre-shear guide plate, i.e., at a distance H (3850mm) from the front of the flying shear, to determine whether the tail of the strip has left the guide plate area. When a strip passes its detection point, a signal 1 is returned to the finishing mill TDC control unit. A queue control CSG module 100 is added to the finishing mill TDC control unit. The queue control CSG module 100 generates a guide plate control queue, obtains the required guide plate opening width setting value for the next strip in advance, and then starts the guide plate control according to the queue control logic, so that the new width setting can be executed in advance, avoiding steel feed blockage caused by the guide plate not being in place.

[0041] Figure 3The remaining labels are explained as follows: CS is the flying shear, used to perform head and tail shearing of the roughing mill incoming material; L2 is the 2050 hot rolling process control computer, used for production line process control, and sends set values ​​to the finishing mill TDC control unit; L1 is the 2050 finishing mill basic automation system, including the TDC control unit, the finishing mill human-machine interface (HMI), and peripheral drives and detection equipment for the finishing mill automation equipment; CSG is the guide plate control module in the finishing mill TDC, which contains existing technology programs for controlling the guide plate's movement; CSH is the flying shear control module in the finishing mill TDC, used for flying shear control and sending opening width set values ​​to the guide plate; SDH is the set value processing module in the finishing mill TDC, used to receive the width settings sent by L2 and respond to CSH requests to send the width settings to the CSH module.

[0042] The specific steps of the pre-cut guide plate queue control method of the present invention are as follows:

[0043] S1. When the head of the strip exits the work roll R4, L2 sends the strip width setting value to the finishing TDC control unit. The queue control CSG module 100 reads the strip width setting value and stores it in the width tracking queue B2 position.

[0044] S2. The queue control CSG module 100 determines whether the width tracking queue B1 position has been executed. If it has been executed, the original width tracking queue B1 position is removed from the queue, and the width tracking queue B2 position is moved up to the width tracking queue B1 position.

[0045] S3. The queue control CSG module 100 compares the current strip width setting with the new setting of the width tracking queue B2 position to determine the direction of the guide plate's movement.

[0046] S4. If the width of the next strip is greater than the current strip width, the guide plate moves in the direction of increasing the opening; if the width of the next strip is less than the current strip width, the guide plate moves in the direction of decreasing the opening.

[0047] After receiving the guide plate width setting value from the queue control CSG module 100, the S5 and CSG modules control the guide plate to move according to the setting before the head of the lower strip reaches the first phototube HMD01. After the guide plate moves to the correct position, the lower strip is allowed to enter the finishing mill; otherwise, the steel feed is blocked.

[0048] Step S4 above further includes:

[0049] If the width of the next strip is greater than the current strip width, the guide plate moves in the direction of increasing the opening width. It is determined whether the time it takes for the tail of the current strip to leave the first phototube HMD01 has reached 4.5s. If it has reached 4.5s, the queue control CSG module 100 sends the setting value of the width of the next strip that is larger to the CSG module as the setting value of the guide plate opening width. If the width of the next strip is less than the current strip width, the guide plate moves in the direction of decreasing the opening width. It is determined whether the tail of the current strip has left the guide plate exit, that is, left the second phototube HMD02. If the tail of the strip has left, the queue control CSG module 100 sends the setting value of the width of the next strip that is smaller to the CSG module as the setting value of the guide plate opening width.

[0050] In step S4 above, an enable switch is set on the queue control CSG module 100. When the enable switch is 1, the queue control CSG module 100 sends the set values ​​generated in steps S3 and S4 to the CSG module.

[0051] To facilitate comparison between the pre-cut guide plate queue control method of this invention and the prior art, the CSH's transmission of the set value to the CSG was not disconnected in the prior art. In actual operation, the transmission time of this value is later than the transmission time set by the pre-cut guide plate queue control method of this invention. What takes effect is the setting issued by the queue control CSG module 100 of the pre-cut guide plate queue control method of this invention. This connection is retained only for monitoring and comparison in the PDA.

[0052] The main features of this invention's pre-shear guide plate queue control method are: adding a strip width setting queue signal. The first signal in the queue stores the current control width, and the second signal stores the newly issued width signal from L2. The L1 control unit uses the first signal to control the guide plate. After L1 completes control, the second signal automatically becomes the first signal. The introduction of the queue frees the flying shear's pre-shear guide plate from the limitation of whether the flying shear has completed cutting the current strip tail, enabling the guide plate to move in advance. This ensures that when the width of the next strip changes, the flying shear's pre-shear guide plate can move to the required opening position in advance, avoiding the problem of steel entry blockage in the finishing rolling area and eliminating potential equipment malfunctions and downtime caused by strip getting stuck in the guide plate area, thereby improving the rolling rhythm of the production line.

[0053] Example

[0054] Combination Figure 5 and Figure 6 As shown in the figure, this embodiment takes a 2050 strip steel finishing line as an example. In the figure, "OLD CSG SetupValue" is the opening width setting sent by CSH to CSG in the original method; "NEW CSG Setup Value" is the opening width setting sent by the queue control CSG module to CSG in the shearing guide plate queue control method of this embodiment.

[0055] refer to Figure 5When the guide plate moves to a large position, the setting is 12.5 seconds earlier, meaning the finishing mill can feed steel 12.5 seconds earlier; (Reference) Figure 6 When the guide plate moves to a smaller position, it is set to arrive 5.82 seconds earlier, meaning that the finishing mill can start feeding steel 5.82 seconds earlier.

[0056] Extensive data after implementation shows that after the shearing guide plate queue control method of this embodiment is put into operation, regardless of whether the guide plate moves in a large or small direction, the shearing guide plate queue control method of this embodiment can achieve the purpose of advancing the steel feed in the finishing mill, that is, improving the rolling rhythm. The rhythm improvement effect has the following characteristics:

[0057] 1) The rhythm-enhancing effect of the guide plate on large movements is generally better than that on small movements;

[0058] 2) The faster the rolling pace of the production line, the more obvious the improvement effect;

[0059] 3) The earlier the R4 is produced at the head of the next strip, the more obvious the improvement effect will be;

[0060] 4) Due to the above three points, the lifting effect of each piece of steel will be different.

[0061] In summary, the shear guide plate queue control method of the present invention can be extended to the control of the flying shear guide plate in other similar hot-rolled strip steel plants, so as to realize the early start of the guide plate, avoid the blockage of the steel feed in the finishing mill caused by the guide plate not moving in place, thereby reducing the waiting time of the strip at the entry of the finishing mill and improving the rolling rhythm of the production line.

[0062] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any variations or modifications to the above embodiments that are within the spirit and essence of the present invention will fall within the scope of the claims of the present invention.

Claims

1. A method for controlling the pre-shear guide plate queue to improve rolling rhythm, characterized in that, A queue control (CSG) module is added to the finishing mill TDC control unit to perform the following steps: S1. When the head of the strip exits the work roll R4, L2 sends the width setting value of the strip to the finishing TDC control unit, and the queue control CSG module reads the width setting value of the strip and stores it in the width tracking queue B2 position. S2. The queue control CSG module determines whether the width tracking queue B1 position has been executed. If it has been executed, the original width tracking queue B1 position is removed from the queue, and the width tracking queue B2 position is moved up to the width tracking queue B1 position. S3. The queue control CSG module compares the current strip width setting with the new setting of the width tracking queue B2 position to determine the direction of the guide plate's movement. S4. If the width of the next strip is greater than the current strip width, the guide plate moves in the direction of increasing the opening; if the width of the next strip is less than the current strip width, the guide plate moves in the direction of decreasing the opening. S5. After receiving the guide plate width setting value from the queue control CSG module, the CSG module controls the guide plate to move according to the setting before the head of the next strip reaches the first phototube. After the guide plate moves to the correct position, the next strip is allowed to enter the finishing mill; otherwise, the steel feed is blocked.

2. The method for controlling the pre-shear guide plate queue to improve rolling rhythm according to claim 1, characterized in that: A second phototube is added at the exit position of the flying shear guide plate to detect whether the tail of the strip has left the guide plate area.

3. The method for controlling the pre-shear guide plate queue to improve rolling rhythm according to claim 2, characterized in that: The second phototube is 3800-3900mm away from the flying shear.

4. The method for controlling the pre-shear guide plate queue to improve rolling rhythm according to claim 2, characterized in that, Step S4 further includes: If the width of the next strip is greater than the current strip width, the guide plate moves in the direction of increasing the opening width. It is determined whether the time since the tail of the current strip left the first phototube has reached more than 3 seconds. If it has, the queue control CSG module sends the setting value of the next strip width as the guide plate opening width setting value. If the width of the next strip is less than the current strip width, the guide plate moves in the direction of decreasing the opening width. It is determined whether the tail of the current strip has left the guide plate outlet, i.e., left the second phototube. If the tail of the strip has left, the queue control CSG module sends the setting value of the next strip width as the guide plate opening width setting value.

5. The method for controlling the pre-shear guide plate queue to improve rolling rhythm according to claim 4, characterized in that: In step S4, an enable switch is set on the queue control CSG module. When the enable switch is 1, the queue control CSG module sends the set values ​​generated in steps S3 and S4 to the CSG module.

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