A method for controlling the center position of a front shearing guide for improving rolling rhythm

Abstract

The application discloses a method for controlling the middle position of a guide plate before shearing to improve rolling rhythm, and adds a middle position control CSG module in a finish rolling TDC control unit and a middle position limiting switch on a gear box. The middle position control CSG module determines whether the next guide plate operation is to a newly set position or to a middle position through a newly set judgment logic. If the L2 has issued a next block steel width setting, a guide plate control queue is generated in the middle position control CSG module, the guide plate width queue is input into the program block, and the subsequent guide plate control is started to make the new width setting be executed in advance. If the L2 has not issued a next block steel width setting, the middle position control CSG module controls the guide plate to be operated to the guide plate middle position 1400mm position in advance, and after the width queue receives a new setting, the next step control is executed according to the previous step. The application eliminates the possible equipment failure shutdown caused by the steel being stuck in the guide plate area, and improves the rolling rhythm of the production line.

Description

Technical Field

[0001] This invention relates to hot rolling / finishing technology, and more specifically, to a method for controlling the center position of the shear guide plate 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.

[0013] 4) If the next strip has not yet exited the work roll R4, L2 will not send a new setting to the finishing mill TDC control unit. At this time, the guide plate will stop at the previous setting position until it receives a new setting before it will move. Summary of the Invention

[0014] To address the aforementioned deficiencies in the existing technology, the purpose of this invention is to provide a method for controlling the mid-position of the pre-shear guide plate to improve the rolling rhythm. This method can avoid the problem of steel entry blockage in the finishing rolling area, eliminate equipment failures and shutdowns that may be caused by strip getting stuck in the guide plate area, and thus improve the rolling rhythm of the production line.

[0015] To achieve the above objectives, the present invention adopts the following technical solution:

[0016] A method for improving the rolling rhythm by controlling the mid-position of the flying shear guide plate involves adding a second phototube at the exit position of the flying shear guide plate, adding a mid-position limit switch to the gearbox, and adding a mid-position control CSG module to the finishing mill TDC control unit to execute the following steps:

[0017] S1. Determine whether the mid-position control CSG module has received a new strip width setting value from L2;

[0018] S2. If no signal is received, check whether the strip has left the second phototube. If it has left the second phototube, start the guide plate. When the guide plate reaches the middle position, the middle limit switch stops the guide plate and waits for L2 to send a new setting.

[0019] If received, a strip width tracking queue is established. 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 mid-position control CSG module reads the strip width setting value and stores it in the width tracking queue B2 position.

[0020] S3. The 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.

[0021] S4. The mid-position 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.

[0022] S5. 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.

[0023] S6. After receiving the guide plate width setting value from the mid-position control CSG module, the CSG module controls the guide plate to move according to the setting before the head of the lower strip reaches the first phototube. 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.

[0024] Preferably, the second phototube is 3800-3900mm away from the flying shear.

[0025] Preferably, step S5 further includes:

[0026] 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 center position control CSG module sends the setting value of the increased strip width of the next strip 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 outlet, i.e., left the second phototube. If the tail of the strip has left, the center position control CSG module sends the setting value of the decreased strip width of the next strip to the CSG module as the setting value of the guide plate opening width.

[0027] Preferably, in step S5, a function switch is set on the center position control CSG module. When the function switch is 1, the center position control CSG module sends the set value generated in steps S4 and S5 to the CSG module.

[0028] Preferably, in step S2, the detection limit of the center limit switch is the center position of the guide plate, which refers to the center value of the width specification range of the strip produced on the hot rolling production line.

[0029] The method for controlling the mid-position of the shear guide plate to improve rolling rhythm provided by this invention has the following beneficial effects:

[0030] 1) The CSG module determines whether the guide plate should first move to the center position (1400mm) or directly start the subsequent queue control based on whether it has received a new setting from L2. If no setting has been received, moving to the center position first ensures that the guide plate is in the optimal waiting position. After receiving the setting, it will reach the set position in the shortest time and with the smallest stroke.

[0031] 2) After receiving the width setting of the next strip from L2, the mid-position 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.

[0032] 3) The second phototube HMD02 added at the guide plate outlet enables the detection of whether the tail of the strip has left the guide plate area, creating the hardware conditions for guide plate center position control;

[0033] 4) 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 mid-position control CSG module, as long as the tail of the current strip leaves the first phototube HMD01 for more than 4.5 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.

[0034] 5) 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 mid-position 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.

[0035] 6) The method for controlling the mid-position of the shearing guide plate in this invention is equipped with a function switch. When in use, the function switch is set to 1. If you want to temporarily switch to the original method, you only need to set the function switch to 0.

[0036] 7) The pre-shear guide plate mid-position control method of the present invention significantly advances the start time of the pre-shear 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 being in place, and improving the rolling rhythm. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the existing guide plate equipment layout and control;

[0038] Figure 2 This is a schematic diagram of the control logic flow of an existing guide plate device;

[0039] 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;

[0040] 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;

[0041] 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, as shown in the embodiment of the guide plate queue control method of the present invention.

[0042] 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 described in the embodiment of the guide plate queue control method of the present invention. Detailed Implementation

[0043] 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.

[0044] Combination Figure 3 and Figure 4As shown, the present invention provides a method for controlling the center position of the shear guide plate to improve rolling rhythm. A second photocell HMD02 is added at the exit position of the flying shear guide plate, i.e., at a distance H (3850mm) from the front of the flying shear. This photocell is used 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 center position control CSG module 100 is added to the finishing mill TDC control unit to realize the advance action of the shear guide plate. Based on whether a newly set judgment logic is received, it determines whether the guide plate will move to the newly set position or to the center position next. A center position limit switch 200 is added to the gearbox to confirm and verify the 1400mm limit of the guide plate center position.

[0045] Figure 3 The 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.

[0046] The specific steps of the pre-shear guide plate mid-position control method of the present invention are as follows:

[0047] S1. Determine whether the mid-position control CSG module 100 has received a new strip width setting value from L2;

[0048] S2. If no signal is received, check whether the strip has left the flying shear guide plate area, i.e., left the second phototube HMD02. If it has left the second phototube HMD02, activate the middle limit switch 200. When the guide plate is allowed to reach the middle position of 1400mm, the middle limit switch 200 is set to 1, causing the guide plate to stop moving and wait for L2 to send a new setting.

[0049] If received, a strip width tracking queue is established. 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 mid-position control CSG module 100 reads the strip width setting value and stores it in the width tracking queue B2 position.

[0050] S3. The CSG module 100 of the middle position control 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.

[0051] S4. The CSG module 100 of the middle position control compares the current strip width setting with the new setting of the reading width tracking queue B2 to determine the direction of the guide plate's movement.

[0052] S5. 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.

[0053] After receiving the guide plate width setting value from the mid-position control CSG module 100, the S6 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.

[0054] Step S5 above further includes:

[0055] 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 mid-position control CSG module 100 sends the setting value of the increased strip width of the next strip 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 mid-position control CSG module 100 sends the setting value of the decreased strip width of the next strip to the CSG module as the setting value of the guide plate opening width.

[0056] In step S5 above, a function switch is set on the mid-position control CSG module 100. When the function switch is 1, the mid-position control CSG module 100 sends the set values ​​generated in steps S4 and S5 to the CSG module.

[0057] The CSG module 100, a mid-position control module, determines whether the guide plate will move to the newly set position or to the mid-position based on whether a new setting has been received. If L2 has already issued the width setting for the next strip, a guide plate control queue is generated in the CSG module 100. The new setting is input into the guide plate width queue of this program block, and subsequent guide plate control is started, allowing the new width setting to be executed in advance. If L2 has not yet issued the width setting for the next strip, the CSG module 100 controls the guide plate to move to the 1400mm mid-position. After the width queue receives the new setting, the next control step is executed according to the previous step.

[0058] To facilitate comparison between the pre-leader queue control method of this invention and the prior art, the "CSH forwarding width setting to CSG" in the prior art was not disconnected. In actual operation, the time when this value is sent is later than the time when the pre-leader queue control method of this invention is set. What takes effect is the setting issued by the bit control CSG module 100 in the pre-leader queue control method of this invention. This connection is retained only for monitoring and comparison in the PDA.

[0059] The method for controlling the mid-position of the shear guide plate in this invention is mainly reflected in:

[0060] 1) If the strip has not yet exited R4 and L2 has not yet issued a new setting: If there is no strip in the flying shear front guide plate area at this time, the control guide plate will first move to the center position of 1400mm. (Since the width of most 2050 strip is between 900mm and 1900mm, the center position of the guide plate is 1400mm.) In this way, after L2 issues a new setting, the guide plate can run the minimum stroke and reach the set position in the shortest time.

[0061] 2) When the strip exits R4 and L2 issues a new width setting: A strip width setting queue signal is established. The first signal in the queue stores the current control width, and the second signal stores the new width signal issued by L2. The L1 control unit uses the first signal to control the guide plate. When L1 completes control, the second signal automatically becomes the first signal.

[0062] The introduction of queues frees the flying shear guide plate from the constraint of whether the flying shear has completed the cutting of the current strip tail, enabling the guide plate to move in advance. Implementing this method avoids the problem of steel entry blockage in the finishing rolling area, 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.

[0063] Example

[0064] 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 center control CSG module to CSG in the center control method of the shear guide plate in this embodiment.

[0065] refer to Figure 5 When 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.

[0066] Extensive data after implementation shows that after the shearing guide plate mid-position control method of this embodiment is put into operation, regardless of whether the guide plate moves to a large or small position, the shearing guide plate mid-position control method of this embodiment can achieve the purpose of advancing the steel feed in the finishing mill, that is, improving the rolling rhythm. Its rhythm improvement effect has the following characteristics:

[0067] 1) The rhythm-enhancing effect of the guide plate on large movements is generally better than that on small movements;

[0068] 2) The faster the rolling pace of the production line, the more obvious the improvement effect;

[0069] 3) The earlier the R4 is produced at the head of the next strip, the more obvious the improvement effect will be;

[0070] 4) Due to the above three points, the lifting effect of each piece of steel will be different.

[0071] In summary, the pre-shear guide plate mid-position control method of the present invention can be extended to the control of the pre-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 being 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.

[0072] 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 center position of the shear guide plate to improve rolling rhythm, characterized in that, To execute the following steps, a second photoelectric tube is added at the exit position of the flying shear guide plate, a mid-position limit switch is added to the gearbox, and a mid-position control CSG module is added to the finishing mill TDC control unit: S1. Determine whether the mid-position control CSG module has received a new strip width setting value from L2; S2. If no signal is received, check whether the strip has left the second phototube. If it has left the second phototube, start the guide plate. When the guide plate reaches the middle position, the middle limit switch stops the guide plate and waits for L2 to send a new setting. If received, a strip width tracking queue is established. 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 mid-position control CSG module reads the strip width setting value and stores it in the width tracking queue B2 position. S3. The 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. S4. The mid-position 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. S5. 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. S6. After receiving the guide plate width setting value from the mid-position control CSG module, the CSG module controls the guide plate to move according to the setting before the head of the lower strip reaches the first phototube. 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.

2. The method for controlling the center position of the shear guide plate to improve rolling rhythm according to claim 1, characterized in that: The second phototube is 3800-3900mm away from the flying shear.

3. The method for controlling the center position of the shear guide plate to improve rolling rhythm according to claim 1, characterized in that, Step S5 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 center position control CSG module sends the setting value of the increased strip width of the next strip 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 outlet, i.e., left the second phototube. If the tail of the strip has left, the center position control CSG module sends the setting value of the decreased strip width of the next strip to the CSG module as the setting value of the guide plate opening width.

4. The method for controlling the center position of the shear guide plate to improve rolling rhythm according to claim 3, characterized in that: In step S5, a function switch is set on the center position control CSG module. When the function switch is 1, the center position control CSG module sends the set values ​​generated in steps S4 and S5 to the CSG module.

5. The method for controlling the center position of the shear guide plate to improve rolling rhythm according to claim 1, characterized in that: In step S2, the detection limit of the center limit switch is the center position of the guide plate. The center position of the guide plate refers to the center value of the width specification range of the strip produced on the hot rolling production line.

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