Flywheel type cold shear clutch brake interlock protection control method

Abstract

The application discloses a flywheel type cold shear clutch brake interlocking protection control method and belongs to the technical field of flywheel type cold shear control, and solves the technical problem that the action completion of a brake and a clutch completely depends on the stability of delay processing, and the method is as follows: a brake pressure switch is arranged in a brake air pressure output circuit of the cold shear, a clutch pressure switch is arranged in a clutch air pressure output circuit, pressure feedback signals of the brake and the clutch during the action of the cold shear are collected in real time through the brake pressure switch and the clutch pressure switch, the action pressure of the brake and the clutch is tracked in real time according to the pressure feedback signals of the brake and the clutch, logical judgment is performed, and interlocking protection of the brake and the clutch is realized. The application completely eliminates the uncontrollable action of the brake and the clutch or the damage of components themselves, and leads to abnormal signals. The flywheel type cold shear clutch brake interlocking protection control method has the advantages of simple operation, precise control and efficient execution.

Description

Technical Field

[0001] This invention relates to the field of flywheel cold shear control technology, and more specifically, to a flywheel cold shear clutch and brake interlock protection control method. Background Technology

[0002] A cold shear is a device for cutting rolled works. The cold shear is driven by a motor, and when the shearing machine starts working, the brake is engaged. At this time, the upper cutting edge moves linearly through the clutch engagement, while the lower cutting edge is fixed to the frame. As the upper cutting edge descends, it cuts the rolled workpiece. After cutting, the clutch disengages, and the brake engages. A set delay allows the upper cutting edge to return to its initial highest position. The cold shear device repeats this motion to complete the cutting task.

[0003] In normal production, the set length of the flying shear is first set. Steel is thrown onto the moving teeth of the cooling bed via the brake skirt. Each length is gradually conveyed to the alignment roller conveyor for alignment, then moved by the counting chain, and finally traversed to the output roller conveyor of the cooling bed via the unloading trolley. Pressing the stop-length baffle button after the cold shearing causes the stop-length baffle to descend into position. The length is then conveyed to the stop-length baffle via the output roller conveyor and the post-cold shear roller conveyor. Once in position, pressing the cold shear button initiates the downward pressing action of the pressure roller. 1.5 seconds later, after the pressure roller reaches its position, the brake opens, the brake is de-energized, and the clutch engages after a 0.5-second delay. This delay ensures the brake is fully disengaged before the clutch engages. Upon reaching the clutch disengagement detection position, the clutch opens after a screen delay, and the brake closes after another 0.5-second delay. This delay ensures the clutch is fully disengaged before the brake engages, completing one cold shearing cycle.

[0004] The main defects and shortcomings are:

[0005] 1. Both the brake and clutch are controlled by pneumatic solenoid valves, and the operation of the brake and clutch relies entirely on time delay processing.

[0006] 2. When vibration at the site causes the wiring to loosen or the components themselves to be damaged, the cold shearing action will malfunction.

[0007] 3. Due to the above reasons, when the brake malfunctions, if the clutch engages while the brake is not disengaged, it is equivalent to rotating the equipment while braking; or if the brake engages while the clutch is not disengaged, it is equivalent to braking while the equipment is running. Both situations will cause the clutch and brake to spark and emit smoke. If the current reaches the electrical control trip current, it will force the cold shear to stop. If the electrical control system does not react in time, the accident will escalate and may directly break the cold shear spindle. Replacing the cold shear spindle will take at least 5-7 days, directly causing on-site production interruption. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to address the above-mentioned shortcomings of the prior art. The purpose of the present invention is to provide a flywheel-type cold shear clutch braking interlock protection control method.

[0009] The technical solution of this invention is: a flywheel-type cold shear clutch-brake interlock protection control method, characterized in that a brake pressure switch is set in the brake air pressure output circuit of the cold shear and a clutch pressure switch is set in the clutch air pressure output circuit. The brake pressure switch and clutch pressure switch are used to collect the pressure feedback signals of the brake and clutch in real time when the cold shear is in operation. The operating pressure of the brake and clutch is tracked in real time according to the pressure feedback signals of the brake and clutch, and logical judgment is performed to realize the interlock protection of the brake and clutch.

[0010] As a further improvement, the following steps are included:

[0011] Step 1. Pressure switch model selection: Based on the on-site process conditions, select a pressure switch that can meet the requirements of real-time pressure detection under on-site working conditions as the brake pressure switch and clutch pressure switch.

[0012] Step 2. Determine the location of the pressure switch and install the hardware. The installation location of the brake pressure switch and clutch pressure switch should be as far away from oil and rotating areas as possible while meeting the measurement results. Protect the pressure switch body from impact and dust and oil. Protect and fix the pressure switch circuit.

[0013] Step 3. Connect the pressure switch signals to the PLC control system. Connect the signals of the brake pressure switch and clutch pressure switch to the local cold shear station. Obtain the real-time pressure feedback signal through communication between the PLC system and the local station.

[0014] Step 4. Tracking the feedback signal of the pressure switch: Track the signals of the connected brake pressure switch and clutch pressure switch using high-speed data acquisition software, and adjust the set values ​​and sensitivity of the brake pressure switch and clutch pressure switch by comparing the data.

[0015] Step 5. System logic writing, including 4 logical judgment scenarios;

[0016] 1) Invert the signal of the brake pressure switch and insert it in series before the clutch output Q point signal. When the brake is opened, the delay time is reached, the clutch closing condition is met, and the clutch command is output. When the brake pressure switch has an output, disconnect the Q point output. The clutch can only operate when the brake pressure is lower than the set value and the brake pressure switch has no output.

[0017] 2) Invert the signal of the clutch pressure switch and insert it in series before the output Q point signal of the brake. When the clutch is open, the delay time is reached, the brake closing condition is met, and the brake command is output. When the clutch pressure switch has an output, disconnect the Q point output. The brake can only be activated when the clutch pressure is lower than the set value and the clutch pressure switch has no output.

[0018] 3) When the clutch pressure switch has an output, stop the operation of the cooling bed output roller to prevent the steel of multiple lengths from moving during the cold shearing operation;

[0019] 4) When the program detects an abnormality in the clutch or brake pressure switch signal, an alarm message will be displayed on the screen, and the abnormal situation can be blocked on the screen. The program can be put back into operation after the abnormal situation is resolved.

[0020] Step 6. System program simulation and debugging: All the written logic output points are downloaded to the PLC in parts using intermediate points. High-speed data acquisition software is used for monitoring and analysis. Through big data comparison, the pressure setting parameters of the brake pressure switch and clutch pressure switch are adjusted and compared with the timing of the cold shear action. At the same time, the program is simulated to ensure that the action and signal achieve the expected effect.

[0021] Step 7. System program merging: Through steps one through four above, the core functions of the control system have been completed, including position installation, signal acquisition, position and data processing; by integrating the four logical functions in step five, an innovative flywheel-type cold shear clutch brake interlock protection control system is formed.

[0022] Step 8. Operation screen programming: Control the flywheel-type cold shear clutch and brake interlock protection through logic judgment. The following should be added to the original screen: abnormal pressure signal alarm for brake and clutch, normal pressure signal for brake and clutch, and selection of abnormal pressure signal shielding for brake and clutch.

[0023] Furthermore, the selected brake pressure switch and clutch pressure switch are specifically designed with the following specifications: power supply voltage: DC 20-32V; range: 16, 40, 100, 250, 400, 600 bar; switch output: PNP tube output; analog output: 4-20mA; ohmic resistance: <400 ohms; housing material: stainless steel, meeting the on-site requirements.

[0024] Furthermore, the brake pressure switch and clutch pressure switch are respectively installed at 0.5m from the valve seat outlet.

[0025] Furthermore, the high-speed data acquisition software collects changes in variables within the PLC, with a minimum scan cycle of 10ms, to facilitate the analysis of historical data.

[0026] Furthermore, the signal inversion is as follows: when there is no signal, it remains constantly present; when a signal is generated, the program is disconnected; the output Q-point signal is: the PLC program output point, driving the field equipment.

[0027] Furthermore, all output points are intermediate points and do not participate in program control, which facilitates simulation; the simulation simulates actual actions on site and will not trigger actual actions of the on-site equipment.

[0028] Beneficial effects

[0029] Compared with the prior art, the advantages of this invention are as follows:

[0030] 1. This invention installs a pressure switch at the outlet pressure of the brake and clutch to detect and form an interlock signal to realize real-time pressure signal acquisition, data processing and logical judgment. This can completely eliminate abnormal signal situations caused by uncontrollable brake and clutch movements or damage to the components themselves.

[0031] 2. In this invention, the brake pressure output signal is inverted and fed into the clutch output Q-point signal. When the brake is opened, after a delay time, the clutch closing condition is met, and the clutch command is output. When the brake pressure switch has an output, the Q-point output is disconnected. The clutch can only operate when the brake pressure is lower than the pressure switch set value and there is no output, thus improving safety.

[0032] 3. This invention inverts the clutch pressure output signal and inserts it before the brake output Q-point signal. When the clutch is open, after a delay time, the brake closing condition is met, and the brake command is output. When the clutch pressure switch has an output, the Q-point output is disconnected. The brake can only operate when the clutch pressure is lower than the pressure switch set value and there is no output, thus improving safety.

[0033] 4. When the clutch pressure switch outputs, the present invention stops the operation of the cooling bed output roller conveyor to prevent the steel of multiple lengths from moving during the cold shearing operation, thereby improving safety.

[0034] 5. This invention adds an alarm for abnormal brake clutch pressure signal to the screen, and allows selection of whether the brake clutch pressure signal is normal or abnormal, making operation intuitive and convenient. Attached Figure Description

[0035] Figure 1 This is a flowchart of the present invention;

[0036] Figure 2 This is a screenshot of the operation screen in this invention. Detailed Implementation

[0037] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0038] See Figures 1-2 A flywheel-type cold shear clutch-brake interlock protection control method is proposed, which sets a brake pressure switch in the brake air pressure output circuit and a clutch pressure switch in the clutch air pressure output circuit of the cold shear. The pressure feedback signals of the brake and clutch during cold shear operation are collected in real time through the brake pressure switch and clutch pressure switch, respectively. The operating pressure of the brake and clutch is tracked in real time based on the pressure feedback signals of the brake and clutch, and logical judgment is performed to realize the interlock protection of the brake and clutch.

[0039] This method specifically includes the following steps:

[0040] Step 1. Pressure Switch Model Selection: Based on the on-site process conditions, select a pressure switch that can meet the real-time pressure detection requirements of the operating conditions as the brake pressure switch and clutch pressure switch. Specifically, the selected brake and clutch pressure switches have the following specifications: power supply voltage: DC 20-32V; measuring range: 16, 40, 100, 250, 400, 600 bar; switch output: PNP tube output; analog output: 4-20mA; ohmic resistance <400 ohms; housing material: stainless steel. The PNP output signal is more stable and faster, meeting the on-site requirements. In this embodiment, the pressure switch is used for pressure monitoring and indication in hydraulic and pneumatic systems, and in situations requiring high-frequency switching or high switching accuracy where mechanical pressure relays are insufficient.

[0041] Step 2. Determine the location of the pressure switch and install the hardware. The installation location of the brake pressure switch and clutch pressure switch should be as far away from oil and rotating areas as possible while meeting the measurement results. Protect the pressure switch body from impact and dust and oil. Protect and fix the pressure switch circuit.

[0042] Step 3. Connect the pressure switch signals to the PLC control system. Connect the signals of the brake pressure switch and clutch pressure switch to the local cold shear station. Obtain the real-time pressure feedback signal through communication between the PLC system and the local station. When the pressure switch detects the set pressure signal, it sends 24V to the local station module.

[0043] Step 4. Tracking the feedback signal of the pressure switch: Track the signals of the connected brake pressure switch and clutch pressure switch using high-speed data acquisition software, and adjust the set values ​​and sensitivity of the brake pressure switch and clutch pressure switch by comparing the data.

[0044] Step 5. System logic writing, including 4 logical judgment scenarios;

[0045] 1) Invert the signal of the brake pressure switch and insert it in series before the clutch output Q point signal. When the brake is opened, the delay time is reached, the clutch closing condition is met, and the clutch command is output. When the brake pressure switch has an output, disconnect the Q point output. The clutch can only operate when the brake pressure is lower than the set value and the brake pressure switch has no output.

[0046] 2) Invert the signal of the clutch pressure switch and insert it in series before the output Q point signal of the brake. When the clutch is open, the delay time is reached, the brake closing condition is met, and the brake command is output. When the clutch pressure switch has an output, disconnect the Q point output. The brake can only be activated when the clutch pressure is lower than the set value and the clutch pressure switch has no output.

[0047] 3) When the clutch pressure switch has an output, stop the operation of the cooling bed output roller to prevent the steel of multiple lengths from moving during the cold shearing operation;

[0048] 4) When the program detects an abnormality in the clutch or brake pressure switch signal, an alarm message will be displayed on the screen, and the abnormal situation can be blocked on the screen. The program can be put back into operation after the abnormal situation is resolved.

[0049] Step 6. System program simulation and debugging: All the written logic output points are downloaded to the PLC in parts using intermediate points. High-speed data acquisition software is used for monitoring and analysis. Through big data comparison, the pressure setting parameters of the brake pressure switch and clutch pressure switch are adjusted and compared with the timing of the cold shear action. At the same time, the program is simulated to ensure that the action and signal achieve the expected effect.

[0050] Step 7. System program merging: Through steps one through four above, the core functions of the control system have been completed, including position installation, signal acquisition, position and data processing; by integrating the four logical functions in step five, an innovative flywheel-type cold shear clutch brake interlock protection control system is formed.

[0051] Step 8. Programming the operation screen, such as... Figure 2 As shown, through logical judgment control, the flywheel-type cold shear clutch brake interlock protection needs to add the following to the original screen: abnormal pressure signal alarm for the brake and clutch, normal pressure signal for the brake and clutch, and abnormal pressure signal shielding selection for the brake and clutch.

[0052] Preferably, the brake pressure switch and clutch pressure switch are installed at 0.5m from the valve seat outlet.

[0053] High-speed data acquisition software collects changes in variables within the PLC, with a minimum scan cycle of 10ms, facilitating the analysis of historical data.

[0054] Signal inversion means: when there is no signal, it remains constantly present; when a signal is generated, the program is disconnected; the output Q-point signal is: the PLC program output point, driving the field equipment.

[0055] All output points are intermediate points and do not participate in program control, which facilitates simulation; the simulation simulates actual actions on site and will not trigger actual actions of on-site equipment.

[0056] This invention utilizes pressure switches installed at the outlet pressure points of the brake and clutch to detect and generate interlock signals, enabling real-time pressure signal acquisition, data processing, and logical judgment. This completely eliminates signal anomalies caused by uncontrollable brake and clutch movements or component damage. This invention offers advantages such as simple operation, precise control, and high efficiency.

[0057] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A flywheel-type cold shear clutch braking interlock protection control method, characterized in that, A brake pressure switch is installed in the brake air pressure output circuit of the cold shear, and a clutch pressure switch is installed in the clutch air pressure output circuit. The pressure feedback signals of the brake and clutch during the operation of the cold shear are collected in real time through the brake pressure switch and clutch pressure switch respectively. The operating pressure of the brake and clutch is tracked in real time based on the pressure feedback signals of the brake and clutch, and logical judgment is performed to realize the interlock protection of the brake and clutch. Specifically, the following steps are included: Step 1. Pressure switch model selection: Based on the on-site process conditions, select a pressure switch that can meet the requirements of real-time pressure detection under on-site working conditions as the brake pressure switch and clutch pressure switch. Step 2. Determine the location of the pressure switch and install the hardware. The installation location of the brake pressure switch and clutch pressure switch should be as far away from oil and rotating areas as possible while meeting the measurement results. Protect the pressure switch body from impact and dust and oil. Protect and fix the pressure switch circuit. Step 3. Connect the pressure switch signals to the PLC control system. Connect the signals of the brake pressure switch and clutch pressure switch to the local cold shear station. Obtain the real-time pressure feedback signal through communication between the PLC system and the local station. Step 4. Tracking the feedback signal of the pressure switch: Track the signals of the connected brake pressure switch and clutch pressure switch using high-speed data acquisition software, and adjust the set values ​​and sensitivity of the brake pressure switch and clutch pressure switch by comparing the data. Step 5. System logic writing, including 4 logical judgment scenarios; 1) Invert the signal of the brake pressure switch and insert it in series before the clutch output Q point signal. When the brake is opened, after the delay time is reached, the clutch closing condition is met and the clutch command is output. When the brake pressure switch has an output, disconnect the Q point output. The clutch can only operate when the brake pressure is lower than the set value and the brake pressure switch has no output. 2) Invert the signal of the clutch pressure switch and insert it in series before the output Q point signal of the brake. When the clutch is open, the delay time is reached, the brake closing condition is met, and the brake command is output. When the clutch pressure switch has an output, disconnect the Q point output. The brake can only be activated when the clutch pressure is lower than the set value and the clutch pressure switch has no output. 3) When the clutch pressure switch has an output, stop the operation of the cooling bed output roller conveyor to prevent the multiple-length steel from moving during the cold shearing operation; 4) When the program detects an abnormality in the clutch or brake pressure switch signal, an alarm message will be displayed on the screen, and the abnormal situation can be blocked on the screen. The program can be put back into operation after the abnormal situation is resolved. Step 6. System program simulation and debugging: All the written logic output points are downloaded to the PLC in parts using intermediate points. High-speed data acquisition software is used for monitoring and analysis. Through big data comparison, the pressure setting parameters of the brake pressure switch and clutch pressure switch are adjusted and compared with the timing of the cold shear action. At the same time, the program is simulated to ensure that the action and signal achieve the expected effect. Step 7. System program merging: Through steps one through four above, the core functions of the control system have been completed, including position installation, signal acquisition, position and data processing; by integrating the four logical functions in step five, a flywheel-type cold shear clutch braking interlock protection control system is formed. Step 8. Operation screen programming: Control the flywheel cold shear clutch brake interlock protection through logic judgment. The following should be added to the original screen: abnormal pressure signal alarm of brake and clutch, normal pressure signal of brake and clutch, and selection of abnormal pressure signal of brake and clutch. Signal inversion means: when there is no signal, it remains constantly present; when a signal is generated, the program is disconnected; the output Q-point signal is: the PLC program output point, driving the field devices.

2. The flywheel-type cold shear clutch braking interlock protection control method according to claim 1, characterized in that, The selected brake pressure switch and clutch pressure switch are specifically designed with the following specifications: power supply voltage: DC 20-32V; range: 16, 40, 100, 250, 400, 600 bar; switch output: PNP transistor output; analog output: 4-20mA; ohmic resistance: <400 ohms; housing material: stainless steel, meeting the on-site requirements.

3. The flywheel-type cold shear clutch braking interlock protection control method according to claim 1, characterized in that, Install the brake pressure switch and clutch pressure switch at 0.5m from the valve seat outlet, respectively.

4. The flywheel-type cold shear clutch braking interlock protection control method according to claim 1, characterized in that, High-speed data acquisition software collects changes in variables within the PLC, with a minimum scan cycle of 10ms, facilitating the analysis of historical data.

5. The flywheel-type cold shear clutch braking interlock protection control method according to claim 1, characterized in that, All output points are intermediate points and do not participate in program control, which facilitates simulation. Simulation mimics actual actions on-site and does not trigger actual actions of on-site equipment.

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