Method for precisely controlling water stain blowing of quenched steel plate surface

Abstract

The application discloses a method for precisely controlling water stain blowing of a quenched steel plate, and particularly relates to the following steps: (1) setting a diffuse reflection grating and a gas blowing device at the tail of a quenching machine; (2) in the control system of the steel plate production, combing and calling the length, width and thickness of the quenched steel plate, and the head position and tail position information of the steel plate tracking; (3) comparing the called information with the steel plate position detected by the grating signal and the head position and tail position of the steel plate tracking, and using data software to statistically analyze the thickness demarcation point preset value; (4) compiling a logic program in the control system, when the thickness of the steel plate is less than the preset value, the position of the gas blowing control uses a fixed value, and when the thickness of the steel plate is greater than the preset value, the position of the gas blowing device opening and closing in the program of the control system is multiplied by a relevant coefficient for adjustment; the method is simple and easy to implement, water stain blowing can be performed in time, the plate surface can be blown to, the blowing opening and closing are timely, and the waste of gas blowing energy is effectively reduced.

Description

Technical Field

[0001] This invention relates to a method for blowing away water stains, specifically a method for precisely controlling the blowing away of water stains on the surface of a quenched steel plate, belonging to the field of metallurgical production technology. Background Technology

[0002] With increasingly fierce competition in the steel market, building ultimate competitiveness in manufacturing requires improving product quality. In the heat treatment process of steel production, during the quenching process in a quenching machine, high-temperature steel plates first enter the high-pressure cooling section of the quenching machine. They are then subjected to ultra-rapid cooling at a rate greater than the critical cooling rate by a water flow of 0.8 MPa, causing the steel plate temperature to drop rapidly to below 500℃, resulting in a martensitic phase transformation. During the production process, when the steel plate leaves the quenching machine after being cooled by water, a large amount of water stains remain on its surface. Prolonged immersion in water stains can easily lead to rust on the steel plate surface, affecting its surface quality. Currently, an air blowing device controlled by a grating signal at the tail of the equipment is used to blow away the surface water stains. However, due to the influence of the on-site environment (dust, water mist, high temperature, etc.), the grating is prone to erroneous signals, causing signal occupation and preventing the air blowing from automatically shutting off, resulting in serious energy waste.

[0003] With the country strongly advocating energy conservation and emission reduction, reducing energy waste is imperative. Therefore, developing a method for precisely controlling the blowing of water stains off the surface of steel plates after quenching has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a method for accurately controlling the blowing of water stains on the surface of steel plates after quenching. The method is simple and easy to implement, and the water stains can be blown away in a timely manner, and the entire surface of the plate can be blown away. The blowing is started and stopped in a timely manner, which effectively reduces the waste of air blowing energy.

[0005] To solve the above technical problems, the present invention provides a method for precisely controlling the blowing of water stains on the surface of a steel plate after quenching, specifically including the following steps: (1) A diffuse reflection grating and an air blowing device are installed at the tail of the quenching machine; (2) In the control system of steel plate production, retrieve the length, width, thickness of quenched steel plate and the head and tail positions of steel plate tracking; (3) Combine the information retrieved in step (2) with the steel plate position detected by the grating signal and the head and tail positions of the steel plate tracking, and use data software to perform statistical analysis to obtain the preset value of the thickness boundary point. When the steel plate thickness is less than 50mm, the position of the steel plate detected by the field grating signal is the same as the head and tail positions of the steel plate tracking, and the water stains on the plate surface are blown away. When the steel plate thickness is greater than 50mm, the position of the steel plate detected by the grating signal is different from the tracking position of the head and tail of the steel plate and the information in the control system. The tracking position of the head of the steel plate is lagging, and the water stains on the plate surface cannot be blown away. (4) In the control system, a logic program is programmed so that when the thickness of the steel plate is less than the preset value of 50mm, the position of the air blowing control is fixed. When the head is 27000mm, the air blowing device is turned on and when the tail is 30500mm, the air blowing device is turned off. When the steel plate thickness is greater than 50mm, the control system program adjusts the opening and closing positions of the air blowing device by multiplying by a relevant coefficient, specifically: The opening position (mm) of the air blowing device is: 27000 × thickness × 0.024; The closed position (mm) of the air blowing device is: 30500 × thickness × 0.024.

[0006] The technical solution further defined in this invention is: Furthermore, in the aforementioned method for precisely controlling the blowing of water stains on the surface of the steel plate after quenching, the blowing force intensity of the air blowing device is 0.6 MPa.

[0007] The beneficial effects of this invention are: The first step of this invention is to check the position of the grating set at the tail of the quenching machine. The existing specular reflection principle grating is replaced by a diffuse reflection grating, which is not in the original position of the specular reflection grating, so it is moved. Specular reflection principle gratings are prone to getting their reflective plates dirty and producing many false signals. Diffuse reflection gratings do not require reflective plates, effectively reducing the probability of false signals.

[0008] This invention determines the critical thickness value through comparative analysis. When the thickness is less than this value, the process follows a fixed value to ensure thorough cleaning. When the temperature exceeds this value, the program is optimized by adjusting the position of the blowing device to ensure that water stains on the steel plate surface are thoroughly cleaned, thus guaranteeing product quality. The entire production process ensures that the steel plate surface is well cleaned and precisely controlled, avoiding waste from the blowing equipment, reducing energy consumption, and promoting green development. Attached Figure Description

[0009] Figure 1 This is a flowchart illustrating the method for precisely controlling the blowing of water stains off the surface of a steel plate after quenching, according to an embodiment of the present invention. Detailed Implementation

[0010] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Example 1

[0011] In this embodiment, the diffuse reflection grating, air blowing device, and control system are all available in the prior art. In step (3), data software is used for statistical separation. The data software uses charts in the existing Excel file.

[0012] This embodiment provides a method for precisely controlling the blowing away of water stains on the surface of a quenched steel plate, the structure of which is as follows: Figure 1 As shown, the specific steps include: (1) A diffuse reflection grating and an air blowing device are installed at the tail of the quenching machine. The blowing force of the air blowing device is 0.6 MPa. (2) In the control system of steel plate production, retrieve the length, width, thickness of quenched steel plate and the head and tail positions of steel plate tracking; (3) Combine the information retrieved in step (2) with the steel plate position detected by the grating signal and the head and tail positions of the steel plate tracking, and use data software to perform statistical analysis to obtain the preset value of the thickness boundary point. When the steel plate thickness is less than 50mm, the position of the steel plate detected by the field grating signal is the same as the head and tail positions of the steel plate tracking, and the water stains on the plate surface are blown away. When the steel plate thickness is greater than 50mm, the position of the steel plate detected by the grating signal is different from the tracking position of the head and tail of the steel plate and the information in the control system. The tracking position of the head of the steel plate is lagging, and the water stains on the plate surface cannot be blown away. (4) In the control system, a logic program is programmed so that when the thickness of the steel plate is less than the preset value of 50mm, the position of the air blowing control is fixed. When the head is 27000mm, the air blowing device is turned on and when the tail is 30500mm, the air blowing device is turned off. When the steel plate thickness is greater than 50mm, the control system program adjusts the opening and closing positions of the air blowing device by multiplying by a relevant coefficient, specifically: The opening position (mm) of the air blowing device is: 27000 × thickness × 0.024; The closed position (mm) of the air blowing device is: 30500 × thickness × 0.024.

[0013] The average of the ratios of the actual values ​​of multiple tests to the fixed value is 0.024.

[0014] After implementation, the water stain purging control of 30 steel plates of the same specification with a thickness of less than 50mm and 30 steel plates of the same specification with a thickness of more than 50mm were continuously monitored. Example 2

[0015] This embodiment provides a method for precisely controlling the blowing of water stains off the surface of a steel plate after quenching. The difference from Embodiment 1 is that the thickness is changed to 30mm, while the other parameters remain unchanged. The water stain blowing control of 50 steel plates of the same specification is continuously tracked. Example 3

[0016] This embodiment provides a method for precisely controlling the blowing of water stains off the surface of a steel plate after quenching. The difference from Embodiment 1 is that the thickness is changed to 60mm, while the other parameters remain unchanged. The water stain blowing control of 50 steel plates of the same specification is continuously tracked.

[0017] The purging control results for Examples 1, 2, and 3 are shown in Table 1 below: Table 1 Comparison of purging results in Examples 1-3 Example 1 ±150 good Example 2 ±2000 Poor Example 3 ±2500 Poor As shown in Table 1, the optimal thickness is 50mm, which is the preset value of the thickness dividing point. At 50mm, the purging control effect is the best, and the start-stop position deviation is also minimized.

[0018] In addition to the embodiments described above, the present invention may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A method for precisely controlling the blowing of water stains off the surface of a steel plate after quenching, characterized in that, Specifically, the following steps are included: (1) A diffuse reflection grating and an air blowing device are installed at the tail of the quenching machine; The blowing force of the air blowing device is 0.6 MPa; (2) In the control system of steel plate production, retrieve the length, width, thickness of quenched steel plate and the head and tail positions of steel plate tracking; (3) Combine the information retrieved in step (2) with the steel plate position detected by the grating signal and the head and tail positions of the steel plate tracking, and use data software to perform statistical analysis to obtain the preset value of the thickness boundary point. When the steel plate thickness is less than 50mm, the position of the steel plate detected by the field grating signal is the same as the head and tail positions of the steel plate tracking, and the water stains on the plate surface are blown away. When the steel plate thickness is greater than 50mm, the position of the steel plate detected by the grating signal is different from the tracking position of the head and tail of the steel plate and the information in the control system. The tracking position of the head of the steel plate is lagging, and the water stains on the plate surface cannot be blown away. (4) In the control system, a logic program is programmed so that when the thickness of the steel plate is less than the preset value of 50mm, the position of the air blowing control is fixed. When the head is 27000mm, the air blowing device is turned on and when the tail is 30500mm, the air blowing device is turned off. When the steel plate thickness is greater than 50mm, the control system program adjusts the opening and closing positions of the air blowing device by multiplying by a relevant coefficient, specifically: The opening position (mm) of the air blowing device is: 27000 × thickness × 0.024; The closed position of the air blowing device (mm) is: 30500 × thickness × 0.024; 0.024 is the average of the ratios of the actual values ​​of multiple tests to the fixed value.

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