A control system and method for a wet strip apparatus on a hot dip galvanizing line

Abstract

The application discloses a control system of a wetting strip steel equipment on a hot galvanizing unit, which comprises a control cabinet for installing various components, a cleaning liquid system cabinet for connecting a cleaning liquid and simultaneously detecting the pressure and flow of the cleaning liquid so as to control the flow rate of spraying, and a robot control cabinet for installing control components of the wetting strip steel equipment. The application further discloses a control method of the wetting strip steel equipment on the hot galvanizing unit. The application realizes cleaning of the whole roll system after plating, reduces the accumulation of zinc powder particles on the roll surface, avoids foreign matter pressing defects on the surface of the strip steel, matches the cleaning speed with the data of the unit, makes the cleaning liquid more uniform, and makes the surface quality of the hot galvanizing steel coil meet the user demand.

Description

Technical Field

[0001] This invention relates to control technology for hot-dip galvanizing units, and more specifically, to a control system and method for a strip steel wetting device on a hot-dip galvanizing unit. Background Technology

[0002] Galvanized coils are thin steel sheets immersed in a molten zinc bath, causing a layer of zinc to adhere to their surface. They are primarily produced using a continuous galvanizing process, where coiled steel sheets are continuously immersed in a zinc bath to produce galvanized steel sheets. Alloyed galvanized steel sheets are also manufactured using a hot-dip method, but after exiting the bath, they are immediately heated to approximately 500°C to form an alloy coating of zinc and iron. These galvanized coils exhibit good paint adhesion and weldability.

[0003] However, during the production of hot-dip galvanized steel coils, zinc powder can be shed due to friction between the strip and the roll surface. Improper alloying control can also exacerbate this problem. Long-term accumulation can lead to the formation of larger zinc powder particles (generally around 0.5–1 mm). These particles can then adhere to the strip surface, creating foreign object indentation defects. Therefore, a strip wetting device is installed on the hot-dip galvanizing unit to wet and remove zinc powder particles from the strip surface. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a control system and method for wetting strip equipment on a hot-dip galvanizing unit, thereby achieving cleaning of the entire roller system after galvanizing, reducing the accumulation of zinc powder particles on the roller surface, avoiding defects caused by foreign matter pressing into the strip surface, and matching the cleaning speed with the unit data to ensure more uniform cleaning liquid, so that the surface quality of the hot-dip galvanized steel coil meets user requirements.

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

[0006] The first aspect of this invention provides a control system for a strip steel wetting device on a hot-dip galvanizing unit, comprising:

[0007] Control cabinet, used to install various components;

[0008] The cleaning liquid system cabinet is used to connect the cleaning liquid and simultaneously detect the pressure and flow rate of the cleaning liquid to control the spray velocity.

[0009] Robot control cabinet, used to install control components for equipment used for wetting strip steel.

[0010] Preferably, the robot control cabinet is equipped with a main body drive box and a remote controller;

[0011] A servo motor drive module is installed inside the main drive box.

[0012] The remote control is used to send control command signals to the strip wetting equipment.

[0013] Preferably, the control cabinet is equipped with a safety module, a power module, a controller, a remote control receiver, and a wireless communication module.

[0014] The remote control receiver receives the command signal from the remote control, runs the algorithm within the controller, and outputs the drive signal of the servo motor drive module through the wireless communication module;

[0015] The power module provides power to the control cabinet;

[0016] The safety module provides overload protection for the control cabinet.

[0017] Preferably, the wireless communication module, the controller, the servo motor drive module, and the HMI display screen are all connected via a fieldbus.

[0018] Preferably, the control system is connected to the strip wetting equipment via a cable;

[0019] The cables include power cables and / or communication cables.

[0020] Preferably, the outer surface of the cleaning liquid system cabinet is equipped with an HMI display screen to display the status information and fault alarm information of the strip steel wetting equipment.

[0021] A second aspect of the present invention provides a control method for a control system of a strip steel wetting device on a hot-dip galvanizing unit as described in the first aspect of the present invention, comprising the following steps:

[0022] S1, the upper surface walking device and the lower surface walking device in the strip wetting equipment are in place, and the control cabinet controls the upper surface walking device and the lower surface walking device to automatically inspect the strip and measure its width according to the weld signal issued by the production line system.

[0023] S2, the upper surface walking device and the lower surface walking device reach the designated position according to the patrol position;

[0024] S3, the upper surface walking device and the lower surface walking device drive the corresponding upper surface robot and lower surface robot in the strip wetting equipment to the cleaning liquid spraying position, and automatically open the solenoid valves on the upper surface robot and the lower surface robot to automatically spray cleaning liquid on the surface of the strip.

[0025] S4, the upper surface traveling device and the lower surface traveling device reciprocate until the set number of times the liquid is sprayed is reached;

[0026] S5, the solenoid valve is closed by the robot control cabinet, the upper surface robot and the lower surface robot return to their initial positions, the upper surface walking device and the lower surface walking device return to their initial positions, and the entire automatic cleaning strip steel process ends.

[0027] The present invention provides a control system and method for wetting strip steel on a hot-dip galvanizing unit. By controlling the spraying of cleaning liquid onto the strip steel by the hot-dip galvanizing unit, the entire roller system can be cleaned after galvanizing, reducing the accumulation of zinc powder particles on the roller surface and avoiding defects caused by foreign matter pressing into the strip steel surface. By matching the cleaning speed with the unit data, the cleaning liquid is more uniform, so that the surface quality of the hot-dip galvanized steel coil meets the user's requirements. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structural framework of the control system of the present invention;

[0029] Figure 2 This is a flowchart illustrating an embodiment of the control method of the present invention;

[0030] Figure 3 This is a flowchart illustrating the automatic edge-tracking and width measurement process of the upper surface walking device / lower surface walking device in an embodiment of the control method of the present invention.

[0031] Figure 4 This is a flowchart illustrating the process of the upper surface walking device / lower surface walking device specifying a position based on the patrol position in the embodiment of the control method of the present invention;

[0032] Figure 5 This is a schematic diagram of the process by which the upper surface robot / lower surface robot reaches the area where the cleaning liquid is sprayed, as described in the embodiment of the control method of the present invention.

[0033] Figure 6 This is a schematic diagram of the process of the upper surface robot / lower surface robot opening the solenoid valve in an embodiment of the control method of the present invention;

[0034] Figure 7 This is a schematic diagram of the reciprocating motion of the upper surface walking device / lower surface walking device in an embodiment of the control method of the present invention;

[0035] Figure 8 This is a schematic diagram of the process of the upper surface walking device / lower surface walking device moving laterally from the first edge-tracing position to the second edge-tracing position in the embodiment of the control method of the present invention.

[0036] Figure 9 This is a schematic diagram of the process of closing the solenoid valve by the upper surface robot / lower surface robot in an embodiment of the control method of the present invention;

[0037] Figure 10This is a schematic diagram of the process of the upper surface robot / lower surface robot returning to its original position in an embodiment of the control method of the present invention;

[0038] Figure 11 This is a schematic diagram of the process of the upper surface walking device / lower surface walking device returning to the original position in an embodiment of the control method of the present invention. Detailed Implementation

[0039] 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.

[0040] Combination Figure 1 As shown, the present invention provides a control system for a strip steel wetting device on a hot-dip galvanizing unit, comprising:

[0041] Control cabinet 1 is used to install various components.

[0042] Cleaning liquid system cabinet 2 is used to connect the cleaning liquid, and at the same time, it can detect the pressure and flow rate of the cleaning liquid, and can also control the spray flow rate.

[0043] Robot control cabinet 3 is used to install various control components for the strip wetting equipment.

[0044] The robot control cabinet 3 contains the main body drive box and remote control.

[0045] The main body driver box is used to install the servo motor driver module;

[0046] The remote control is used to send control command signals to the strip wetting equipment.

[0047] The control cabinet 1 contains various components such as a safety module, power module, controller, remote control receiver, and wireless communication module.

[0048] The servo motor drive module inside the main drive box establishes a communication connection with the controller via a fieldbus.

[0049] The servo motor drive module also provides power to the drive motor of the wet strip steel equipment and receives the encoder feedback signal from the drive motor, forming a closed-loop feedback system.

[0050] The outer side of the cleaning liquid system cabinet 2 is equipped with an HMI display screen with built-in interactive software to display the status information and fault alarm information of the strip steel wetting equipment.

[0051] The remote control, as a transmitter, is used to send control command signals to the strip steel wetting equipment.

[0052] Inside the aforementioned control cabinet, the remote control receiver receives the command signals from the remote control, which are then processed by the algorithm within the controller. Finally, the controller outputs the drive signals for the servo motor drive module via the wireless communication module.

[0053] The power module provides power to the control cabinet.

[0054] The safety module provides overload protection for the control cabinet.

[0055] To reduce wiring between the control cabinet and the robot body and prevent potential interference problems caused by wiring, while enhancing the reliability and scalability of the control system, communication connections are established between the wireless communication module, controller, servo motor drive module, and HMI display via fieldbus.

[0056] Fieldbus technology not only has the advantages of strong real-time performance, long transmission distance, strong anti-electromagnetic interference capability, and low cost, but also enables the configuration of multiple control nodes on a single bus, facilitating the connection of multiple drivers and CAN communication devices such as sensors.

[0057] The control system is connected to the strip wetting equipment via a cable.

[0058] Cables include power cables and / or communication cables.

[0059] Combined Figure 1 and Figure 2 As shown, the present invention also provides a control method for the control system of the strip steel wetting equipment on the hot-dip galvanizing unit, comprising the following steps:

[0060] S1. Determine if the upper surface traveling device 4 in the strip wetting equipment is at the origin limit position. If yes, proceed to step S2.

[0061] S2, the control system of this invention selects the fully automatic mode and sets the number of times the cleaning liquid is sprayed;

[0062] S3 allows users to set cleaning plans for spraying cleaning liquid via the HMI display;

[0063] S4, the upper surface traveling device 4 and the lower surface traveling device 5 in the strip wetting equipment are both selected to automatic mode;

[0064] S5, Control cabinet 1 receives welding signals from the production line system;

[0065] S6, the robot control cabinet 3 controls the upper surface walking device 4 to automatically patrol the edge and measure the width of the strip steel;

[0066] S7, the upper surface walking device 4 reaches the first patrol position and drives the upper surface robot 6 to move laterally to the point where the cleaning liquid is to be sprayed.

[0067] S8, the upper surface traveling device 4 reaches the second patrol position;

[0068] S9, the upper surface walking device 4 drives the upper surface robot 6 to move laterally to the position of spraying cleaning liquid;

[0069] S10, open the solenoid valve 8 for spraying cleaning liquid on the upper surface robot 6, and start spraying cleaning liquid onto the upper surface of the strip steel.

[0070] S11, the upper surface traveling device 4 reaches the first patrol position;

[0071] S12, the upper surface walking device 4 then reaches the second patrol position and performs a second cycle, spraying cleaning liquid back and forth.

[0072] S13, after the number of times the cleaning liquid is sprayed reaches the set value, the cleaning liquid spraying solenoid valve 8 is closed, and the spraying stops;

[0073] S14, Robot 6 on the upper surface returns to its original position;

[0074] S15, the upper surface traveling device 4 arrives at the waiting position;

[0075] S16, the robot control cabinet 3 controls the lower surface walking device 5 to automatically patrol the edge and measure the width of the strip steel;

[0076] S17, the lower surface walking device 5 reaches the first patrol position and drives the lower surface robot 7 to move laterally to the point where the cleaning liquid is to be sprayed.

[0077] S18, the lower surface traveling device 5 reaches the second patrol position;

[0078] S19, the lower surface walking device 5 drives the lower surface robot 7 to move laterally to the position of spraying cleaning liquid;

[0079] S20, open the solenoid valve 9 for spraying cleaning liquid on the lower surface robot 7, and start spraying cleaning liquid onto the lower surface of the strip steel;

[0080] S21, the lower surface traveling device 5 reaches the first patrol position;

[0081] S22, the lower surface walking device 5 then reaches the second patrol position and performs a second cycle, spraying cleaning liquid back and forth;

[0082] S23, after the number of times the cleaning liquid is sprayed reaches the set value, the cleaning liquid spraying solenoid valve 9 is closed, and the spraying stops;

[0083] S24, Robot 7 on the lower surface returns to its original position;

[0084] S25, the lower surface walking device 5 reaches the waiting position, and the entire automatic cleaning strip steel process ends.

[0085] Combination Figure 3 As shown, when the control system of the present invention is in automatic mode, it has a ready signal, the access control switch is detected to be normal, the upper surface walking device 4 / lower surface walking device 5 is in the original position and the brake control has been opened, waiting for the production line weld signal, and then automatically patrolling the edge and measuring the width.

[0086] Combination Figure 4 As shown, after the width measurement process of the upper surface walking device 4 / lower surface walking device 5 is completed, the fixed-point water spray mode is not selected and the edge patrol position is equal to the null value. The walking device reaches the designated position according to the edge patrol position.

[0087] Combination Figure 5 As shown, when the upper surface walking device 4 / lower surface walking device 5 reaches the second patrol position and ends, the fixed-point water spraying mode is not activated and the upper surface walking device 4 / lower surface walking device 5 is in a stopped state, the corresponding upper surface robot 6 / lower surface robot 7 automatically enters the area to spray cleaning liquid.

[0088] Combination Figure 6 As shown, the upper surface robot 6 and the lower surface robot 7 enter the area where the cleaning liquid is sprayed. The upper surface robot 6 and the lower surface robot 7 are in a stopped state, and the upper surface walking device 4 and the lower surface walking device 5 are stopped. The corresponding cleaning liquid spraying solenoid valve 8 and the cleaning liquid spraying solenoid valve 9 are opened.

[0089] Combination Figure 7 As shown, the upper surface walking device 4 and the lower surface walking device 5 reach the second patrol position and end, the fixed-point water spray mode is not activated and they are in a stopped state, and the upper surface walking device 4 and the lower surface walking device 5 reciprocate.

[0090] Combination Figure 8 As shown, the upper surface walking device 4 / lower surface walking device 5 moves to the first patrol position. The fixed-point water spraying mode is not activated, the lateral movement is stopped, the lateral movement position is empty, the cleaning liquid spraying solenoid valve 8 / cleaning liquid spraying solenoid valve 9 is opened and the upper surface robot 6 / lower surface robot 7 enters the water spraying area. The upper surface walking device 4 / lower surface walking device 5 moves laterally to the second patrol position.

[0091] Combination Figure 9 As shown, the upper surface walking device 4 / lower surface walking device 5 reaches the first edge patrol position and completes the automatic mode is not activated. The upper surface walking device 4 / lower surface walking device 5 reciprocates until the set number of sprays is reached, and the cleaning liquid solenoid valve 8 / cleaning liquid solenoid valve 9 closes.

[0092] Combination Figure 10 and Figure 11As shown, once the cleaning liquid solenoid valve 8 / 9 is closed, the upper surface walking device 4 / lower surface walking device 5 is in a stopped state, the upper surface robot 6 / lower surface robot 7 returns to their original positions, and the upper surface walking device 4 / lower surface walking device 5 also return to their original positions, thus ending the entire automatic cleaning strip process.

[0093] 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 control system for a strip steel wetting device on a hot-dip galvanizing unit, characterized in that, include: Control cabinet, used to install various components; The cleaning liquid system cabinet is used to connect the cleaning liquid and simultaneously detect the pressure and flow rate of the cleaning liquid to control the spray velocity. Robot control cabinet, used to install control components for equipment used for wetting strip steel.

2. The control system for the strip wetting equipment on the hot-dip galvanizing unit according to claim 1, characterized in that: The robot control cabinet contains a main body drive box and a remote control. A servo motor drive module is installed inside the main drive box. The remote control is used to send control command signals to the strip wetting equipment.

3. The control system for the strip wetting equipment on the hot-dip galvanizing unit according to claim 2, characterized in that: The control cabinet is equipped with a safety module, a power module, a controller, a remote control receiver, and a wireless communication module. The remote control receiver receives the command signal from the remote control, runs the algorithm within the controller, and outputs the drive signal of the servo motor drive module through the wireless communication module; The power module provides power to the control cabinet; The safety module provides overload protection for the control cabinet.

4. The control system for the strip wetting equipment on the hot-dip galvanizing unit according to claim 3, characterized in that: The wireless communication module, the controller, the servo motor drive module, and the HMI display screen are all connected via a fieldbus.

5. The control system for the strip wetting equipment on the hot-dip galvanizing unit according to claim 1, characterized in that: The control system is connected to the strip wetting equipment via a cable; The cables include power cables and / or communication cables.

6. The control system for the strip wetting equipment on the hot-dip galvanizing unit according to claim 1, characterized in that: The outer side of the cleaning liquid system cabinet is equipped with an HMI display screen to display the status information and fault alarm information of the strip steel wetting equipment.

7. A control method for a control system of a strip steel wetting device on a hot-dip galvanizing unit as described in any one of claims 1-6, characterized in that, Includes the following steps: S1, the upper surface walking device and the lower surface walking device in the strip wetting equipment are in place, and the control cabinet controls the upper surface walking device and the lower surface walking device to automatically inspect the strip and measure its width according to the weld signal issued by the production line system. S2, the upper surface walking device and the lower surface walking device reach the designated position according to the patrol position; S3, the upper surface walking device and the lower surface walking device drive the corresponding upper surface robot and lower surface robot in the strip wetting equipment to the cleaning liquid spraying position, and automatically open the solenoid valves on the upper surface robot and the lower surface robot to automatically spray cleaning liquid on the surface of the strip. S4, the upper surface traveling device and the lower surface traveling device reciprocate until the set number of times the liquid is sprayed is reached; S5, the solenoid valve is closed by the robot control cabinet, the upper surface robot and the lower surface robot return to their initial positions, the upper surface walking device and the lower surface walking device return to their initial positions, and the entire automatic cleaning strip steel process ends.

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