Flying shear large tail cutting prevention control method based on double HMD detection

Abstract

The invention relates to a flying shear large tail cutting prevention control method based on double HMD detection, and belongs to the technical field of metallurgical steel rolling equipment control methods. According to the technical scheme, the method comprises the steps that the reasonable distance before flying shear is calculated, and a newly-added hot metal detector and an amplifier unit are installed above a roller bed and used for detecting the running state of a hot-rolled slab; a digital quantity input template is installed in the PLC electrical cabinet, receives induction signals of the newly-added hot metal detector and is used for program calculation. And a program is written to optimize tracking, so that double-HMD detection jointly controlled by the newly added hot metal detector and the pre-shearing scanning type HMD is realized. The method has the advantages that the reasonable distance before flying shearing is calculated, the newly-added hot metal detector is installed above the roller way, the hot metal detector and the pre-shearing scanning type HMD complete common control, then a program is written to optimize tracking, an optimal design scheme of pre-shearing double-HMD detection control is achieved, and the accident that large tail cutting is caused by interference or faults of single scanning HMD detection is avoided.

Description

Technical Field

[0001] The invention relates to a flying shear anti-cutting tail control method based on double HMD (hot metal detector) detection, belonging to the technical field of metallurgical steel rolling equipment control methods. Background Art

[0002] The flying shear system of Handan Iron and Steel's 2250mm hot rolling production line uses a crank-type structure. The start of the flying shear tail cutting control relies on the pre-shear scanning HMD to detect the strip passing and trigger the command after power failure. Therefore, the timing of the pre-shear scanning HMD power failure is very important. Previously, the pre-shear scanning HMD was affected by the water mist on site and lost power in advance. The flying shear moved in advance, causing the tail to be cut, and the tail of the strip was stuck in the chute plate, resulting in a serious equipment accident, affecting production time. With the advancement of the production rhythm, the conditions in the original design are far from meeting the requirements of the production rhythm under the new situation, which has affected the production time.

[0003] Efficient and rapid production requires reducing the occurrence of equipment accidents, improving production rhythm and reducing accident time while ensuring safety. Summary of the invention

[0004] The purpose of the present invention is to provide a control method for preventing large tails from being cut by a flying shear based on dual HMD detection. By calculating the reasonable distance before the flying shear, a new hot metal detector is installed above the roller, so that it can be jointly controlled with the pre-shear scanning HMD, and then a program is written to optimize tracking to achieve an optimized design scheme for pre-shear dual HMD detection control, thereby solving the problem of large tails being cut due to interference or failure of single scanning HMD detection, and effectively solving the above-mentioned problems existing in the background technology.

[0005] The technical solution of the present invention is: a flying shears anti-cutting tail control method based on dual HMD detection, comprising the following steps: (1) Calculate the reasonable distance before the flying shear, and install a new hot metal detector and amplifier unit above the roller to detect the running status of the hot-rolled slab; (2) A digital input module is installed in the PLC electrical cabinet to receive the sensing signal of the newly added hot metal detector for program calculation; (3) Write a program to optimize tracking, realize dual HMD detection controlled by the newly added hot metal detector and the pre-shear scanning HMD, and optimize the startup of the backup shearing timing function.

[0006] In the step (1), a newly added hot metal detector is installed in front of the pre-shear scanning HMD, and the distance between the two matches the distance before the flying shear.

[0007] In step (2), the model of the digital input template is DI334H.

[0008] In the step (3), the hot metal detector and the pre-shear scanning HMD are added in an AND relationship, and both satisfy the flying shear action in the power-off state, and the cutting tail length matches the calculated distance; at the same time, the program optimizes the start-up backup shear timing function to avoid the original design of the pre-shear scanning HMD flashing, causing the premature start of the backup shear and causing a large flying shear tail accident.

[0009] The beneficial effects of the present invention are as follows: by calculating the reasonable distance before the flying shear, a new hot metal detector is installed above the roller, so that it can be jointly controlled with the pre-shear scanning HMD, and then a program is written to optimize tracking to achieve an optimized design scheme for pre-shear double HMD detection control, thereby solving the accident of cutting too big a tail caused by interference or failure of a single scanning HMD detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is the design principle diagram of the present invention; Figure 2 It is a physical picture of the newly added hot metal detector of the present invention; Figure 3 is a physical diagram of the amplifier unit of the present invention; Figure 4 This is a physical diagram of the wiring of the digital quantity input template DI334H installed in the PLC electrical cabinet of the present invention; Figure 5 This is a control diagram of the tail cutting program for realizing double HMD detection and control before cutting according to the present invention; Figure 6 It is a timing control program diagram for optimizing the startup of standby shearing according to the present invention.

[0011] In the figure: newly added hot metal detector 1, amplifier unit 2, digital input template 3, pre-cut scanning HMD 4. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical solutions and advantages of the invention implementation cases clearer, the technical solutions in the implementation cases of the present invention will be clearly and completely described below in conjunction with the drawings in the implementation cases. Obviously, the implementation cases described are only a small part of the implementation cases of the present invention, rather than all the implementation cases. Based on the implementation cases in the present invention, all other implementation cases obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0013] A flying shears anti-cutting tail control method based on dual HMD detection comprises the following steps: (1) Calculate the reasonable distance before the flying shear, and install a new hot metal detector and amplifier unit above the roller to detect the running status of the hot-rolled slab; (2) A digital input module is installed in the PLC electrical cabinet to receive the sensing signal of the newly added hot metal detector for program calculation; (3) Write a program to optimize tracking, realize dual HMD detection controlled by the newly added hot metal detector and the pre-shear scanning HMD, and optimize the startup of the backup shearing timing function.

[0014] In the step (1), a newly added hot metal detector is installed in front of the pre-shear scanning HMD, and the distance between the two matches the distance before the flying shear.

[0015] In step (2), the model of the digital input template is DI334H.

[0016] In the step (3), the hot metal detector and the pre-shear scanning HMD are added in an AND relationship, and both satisfy the flying shear action in the power-off state, and the cutting tail length matches the calculated distance; at the same time, the program optimizes the start-up backup shear timing function to avoid the original design of the pre-shear scanning HMD flashing, causing the premature start of the backup shear and causing a large flying shear tail accident.

[0017] In actual application, the operation process is as follows: 1. The newly added indicator light for hot metal detector 1 is HMD1, and the indicator light for pre-shear scanning HMD is MA02. When the hot-rolled billet passes, HMD1 and MA02 light up in turn.

[0018] 2. MA02 failed and the signal lost power in advance. Since the newly added hot metal detector 1 played a protective control role, the flying shear did not move in advance.

[0019] 3. When HMD1 loses power, the flying shear starts the tail cutting action, and avoids the accident of cutting too much tail according to the calculated distance and tail cutting length.

Claims

1. A control method for preventing large tail cutting of flying shears based on dual HMD detection, characterized in that The following steps are involved: (1) Calculate the reasonable distance before the flying shear, and install a new hot metal detector and amplifier unit above the roller to detect the running status of the hot-rolled slab; (2) A digital input module is installed in the PLC electrical cabinet to receive the sensing signal of the newly added hot metal detector for program calculation; (3) Write a program to optimize tracking, realize the dual HMD detection function controlled by the newly added hot metal detector and the pre-shear scanning HMD, and optimize the startup of the backup shearing timing function.

2. A method for controlling the large tail of a flying shear based on dual HMD detection according to claim 1, characterized in that: In the step (1), a newly added hot metal detector is installed in front of the pre-shear scanning HMD, and the distance between the two matches the distance before the flying shear.

3. The method for controlling the large tail of the flying shears based on dual HMD detection according to claim 1, characterized in that: In step (2), the model of the digital input template is DI334H.

4. The method for controlling the large tail of the flying shears based on dual HMD detection according to claim 1, characterized in that: In the step (3), the hot metal detector and the pre-shear scanning HMD are added in an AND relationship, and both satisfy the flying shear action in the power-off state, and the cutting tail length matches the calculated distance; at the same time, the program optimizes the start-up backup shear timing function to avoid the premature start-up of the backup shear due to the flashing of the pre-shear scanning HMD, resulting in a large flying shear tail accident.

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