Swing water cooling automatic control method for super-thick plate

Abstract

The application discloses a swing water-cooling automatic control method for a special thick plate, wherein the special thick plate enters a DQ section and is cooled by adopting a back-and-forth swing, and when the back-and-forth swing pass is equal to a set pass, the special thick plate enters an LCS section and is cooled by adopting one-pass cooling. The application realizes the following purpose: when the final-rolled plate is too thick and exceeds the cooling capacity of the conventional one-pass water cooling, the automatic swing water cooling mode can be adopted to achieve effective cooling.

Description

Technical Field

[0001] This invention relates to an automated control method for steel plate cooling, and more specifically, to an automated control method for swing water cooling of extra-thick plates. Background Technology

[0002] The cooling system is a crucial production step in the production of thick plates, consisting of the DQ section (oscillating cooling zone) with pinch rollers and the LCS section (through-type cooling zone) with U-shaped spray devices. In actual production, there are often cooling requirements for steel plates of special thicknesses, which cannot often reach the final cooling temperature through conventional single-pass water cooling.

[0003] The existing solution involves manual intervention, using manually controlled roller conveyors and temperature verification via temperature measuring instruments after the LCS section. The steel plate is manually oscillated back and forth in the water-cooled zone. This method heavily relies on operator experience and frequently results in excessively high or low final cooling temperatures, posing a risk of substandard product performance parameters. Furthermore, to prevent excessively high final cooling temperatures after the entire cooling system, the manifold must be kept open until the temperature is manually verified to be suitable, at which point the manifold is closed to end the cooling process. However, the cooling flow rate for extra-thick plates is very high, leading to significant waste of water and electricity resources. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide an automatic control method for swing water cooling of extra-thick plates. This method enables the use of automatic swing water cooling to effectively cool steel plates that are too thick and exceed the cooling capacity of conventional single-pass water cooling.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An automatic control method for swing water cooling of extra-thick plates;

[0007] The extra-thick steel plate enters the DQ section and is cooled by reciprocating swing. When the number of reciprocating swings equals the set number of swings, the extra-thick steel plate enters the LCS section and is cooled by one-pass cooling.

[0008] Preferably, the automatic control method for swing water cooling specifically includes the following steps:

[0009] S1, Process entry;

[0010] S2, the cooling system L1 activates position tracking and sends a request to the cooling model machine L2;

[0011] S3, the cooling model machine L2 performs calculations and sends the results to the cooling system L1;

[0012] S4, open the manifold inside the DQ section, and pre-position the pinch rollers;

[0013] S5, determine whether the head of the extra-thick steel plate has reached the starting position S1 of the DQ segment. If not, return to step S4; if yes, start swing counting. When the head of the extra-thick steel plate reaches below each set of the pinch rollers, the corresponding pinch rollers begin to descend to the thickness position of the extra-thick steel plate to prepare to clamp the extra-thick steel plate.

[0014] S6, determine whether the head of the extra-thick steel plate has reached the end position S2 of the DQ section. If not, wait for the extra-thick steel plate to arrive. If yes, raise all the pinch rollers to the highest position, start the roller conveyor to run in reverse, and increment the cooling pass count by 1.

[0015] S7, wait for the head of the extra-thick steel plate to reach the starting position S1 of the DQ section again, the roller conveyor will then reverse and the cooling pass count will increment by 1.

[0016] S8. Determine whether the cooling pass count is equal to the set swing pass issued by the cooling model machine L2. If not, the roller conveyor will reverse again, the cooling pass count will be incremented by 1, and steps S7 and S8 will be repeated until the cooling pass count is equal to the set swing pass.

[0017] S9, Open the manifold within the LCS segment;

[0018] S10, when the tail of the extra-thick steel plate reaches the end position S2 of the DQ section, the manifold inside the DQ section is closed;

[0019] S11, when the tail of the extra-thick steel plate reaches the beginning position S3 of the LCS section, close the manifold inside the LCS section;

[0020] S12, the extra-thick steel plate uses a high-temperature scanner to feed back the actual value of the final cooling temperature to the cooling model machine L2.

[0021] Preferably, in step S3, the calculation results of the cooling model machine L2 include the number of manifolds opened, the opening time, the water flow rate, the height of the pinch rollers, the speed of the roller conveyor, and the number of oscillations N.

[0022] Preferably, in step S4, the pinch roller first descends to a position 10mm higher than the thickness of the extra-thick steel plate, and then contacts the extra-thick steel plate after the extra-thick steel plate enters, in order to clamp the extra-thick steel plate.

[0023] This invention provides an automatic control method for oscillating water cooling of extra-thick plates. When the final rolled steel plate is too thick, exceeding the cooling capacity of conventional single-pass water cooling, automatic oscillating water cooling can be used to achieve effective cooling. Simultaneously, while meeting the cooling requirements and quality of extra-thick plates, automatic control is achieved, effectively eliminating the risk of cooling anomalies and ensuring smooth production. It also has the following beneficial effects:

[0024] 1) It avoids the tediousness of manual operation and realizes automated control;

[0025] 2) It prevented abnormal final cooling temperature caused by manual operation, improved cooling quality, and accelerated the cooling cycle;

[0026] 3) There is no need to keep the manifold fully open and wait for manual verification, which effectively saves water and electricity resources. Attached Figure Description

[0027] Figure 1 This is a production line schematic diagram of the automatic control method for oscillating water cooling of the present invention;

[0028] Figure 2 This is a flowchart illustrating the automatic control method for swing water cooling according to the present invention. Detailed Implementation

[0029] 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.

[0030] Combination Figure 1 and Figure 2 As shown, this invention provides an automatic control method for swing water cooling of extra-thick plates.

[0031] Extra-thick steel plates undergo reciprocating oscillation cooling upon entering the DQ section. Once the number of reciprocating oscillation passes equals the set number, the extra-thick steel plate then enters the LCS section for single-pass cooling. This invention achieves automatic control while meeting the cooling requirements and quality requirements of extra-thick plates, effectively eliminating the risk of cooling anomalies and ensuring smooth production.

[0032] The automatic control method for swing water cooling of the present invention specifically includes the following steps:

[0033] S1, the process personnel enter the final cooling temperature and swing command of the corresponding product into the production planning system;

[0034] S2, after receiving the final rolling pass information, the cooling system L1 starts position tracking and sends the starting cooling temperature and PDI information of the extra-thick steel plate to the cooling model machine L2 to request cooling information.

[0035] After confirming the information of the steel plate, the cooling model machine L2 calculates the corresponding number of opening manifolds, opening time, water flow, pinch roll height, roller speed, oscillation number N, etc., and sends the calculation results and oscillation cooling command to the cooling system L1.

[0036] S4, after receiving the swing cooling command, the cooling system L1 immediately opens all manifolds between the start position S1 and the end position S2 of the DQ section in advance, waits for the water flow rate to reach the set value, and lowers the pinch rollers to a position 10mm higher than the thickness of the extra-thick steel plate in advance, waiting for the extra-thick steel plate to enter.

[0037] S5, determine whether the head of the extra-thick steel plate has reached the starting position S1 of the DQ section. If not, return to step S4; if yes, start the swing counting. When the head of the extra-thick steel plate reaches below each set of pinch rollers, the corresponding pinch rollers begin to descend to the thickness position of the extra-thick steel plate, preparing to clamp the extra-thick steel plate to prevent deformation caused by instantaneous cooling. Simultaneously, this seals the surface cooling water of the extra-thick steel plate to prevent water from spreading backward and affecting cooling quality.

[0038] S6, determine whether the head of the extra-thick steel plate has reached the end position S2 of the DQ section. If not, wait for the extra-thick steel plate to arrive. If so, raise all pinch rollers to the highest position and start the roller conveyor to run in reverse. The cooling pass count is incremented by 1.

[0039] S7, wait for the head of the extra-thick steel plate to reach the starting position S1 of the DQ section again, the roller conveyor will then reverse and the cooling pass count will increment by 1.

[0040] S8. Determine whether the cooling pass count is equal to the set swing pass issued by the cooling model machine L2. If not, the roller conveyor will reverse again, the cooling pass count will be incremented by 1, and steps S7 and S8 will be repeated until the cooling pass count is equal to the set swing pass.

[0041] S9, when the number of counted passes equals the set number of passes, all manifolds in the LCS section are opened, and the extra-thick steel plate is allowed to undergo the final pass of through-cooling.

[0042] S10, when the tail of the extra-thick steel plate reaches the end position S2 of the DQ section, close all manifolds in the DQ section, and the extra-thick steel plate continues to advance into the LCS section;

[0043] S11, when the tail of the extra-thick steel plate reaches the beginning position S3 of the LCS section, close all manifolds in the LCS section;

[0044] S12, the extra-thick steel plate is scanned by a high-temperature scanner, and the actual value of the final cooling temperature is fed back to the cooling model machine L2 for self-correction of model calculation.

[0045] 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. An automatic control method for swing water cooling of extra-thick plates, characterized in that: The extra-thick steel plate enters the DQ section and is cooled by reciprocating swing. When the number of reciprocating swings equals the set number of swings, the extra-thick steel plate enters the LCS section and is cooled by one-pass cooling.

2. The automatic control method for swing water cooling of extra-thick plates according to claim 1, characterized in that, The swing water-cooling automatic control method specifically includes the following steps: S1, Process entry; S2, the cooling system L1 activates position tracking and sends a request to the cooling model machine L2; S3, the cooling model machine L2 performs calculations and sends the results to the cooling system L1; S4, open the manifold inside the DQ section, and pre-position the pinch rollers; S5, determine whether the head of the extra-thick steel plate has reached the starting position S1 of the DQ segment. If not, return to step S4; if yes, start swing counting. When the head of the extra-thick steel plate reaches below each set of the pinch rollers, the corresponding pinch rollers begin to descend to the thickness position of the extra-thick steel plate to prepare to clamp the extra-thick steel plate. S6, determine whether the head of the extra-thick steel plate has reached the end position S2 of the DQ section. If not, wait for the extra-thick steel plate to arrive. If yes, raise all the pinch rollers to the highest position, start the roller conveyor to run in reverse, and increment the cooling pass count by 1. S7, wait for the head of the extra-thick steel plate to reach the starting position S1 of the DQ section again, the roller conveyor will then reverse and the cooling pass count will increment by 1. S8. Determine whether the cooling pass count is equal to the set swing pass issued by the cooling model machine L2. If not, the roller conveyor will reverse again, the cooling pass count will be incremented by 1, and steps S7 and S8 will be repeated until the cooling pass count is equal to the set swing pass. S9, Open the manifold within the LCS segment; S10, when the tail of the extra-thick steel plate reaches the end position S2 of the DQ section, the manifold inside the DQ section is closed; S11, when the tail of the extra-thick steel plate reaches the beginning position S3 of the LCS section, close the manifold inside the LCS section; S12, the extra-thick steel plate uses a high-temperature scanner to feed back the actual value of the final cooling temperature to the cooling model machine L2.

3. The automatic control method for swing water cooling of extra-thick plates according to claim 2, characterized in that: In step S3, the calculation results of the cooling model machine L2 include the number of manifolds opened, the opening time, the water flow rate, the height of the pinch rollers, the speed of the roller conveyor, and the number of swing passes N.

4. The automatic control method for swing water cooling of extra-thick plates according to claim 2, characterized in that: In step S4, the pinch roller first descends to a position 10mm higher than the thickness of the extra-thick steel plate, and then contacts the extra-thick steel plate after the extra-thick steel plate enters, in order to clamp the extra-thick steel plate.

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