Stainless steel plate surface spray printing control method
Through the cooperation of HMI computer and PLC, the precise positioning and control of the printing position of the steel plate surface is achieved by using the servo motor and the cylinder, which solves the problems of inaccurate positioning and high leakage rate in the prior art, and improves the printing quality and efficiency.
Patent Information
- Application Number
- CN202510175059.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-18
- Publication Date
- 2025-06-03
AI Technical Summary
The existing steel plate surface printing technology has problems such as inaccurate positioning of the printing position and high leakage rate, resulting in labeling errors and quality objections.
The HMI computer operation interface is used to confirm the printing information, and is connected to the small character inkjet printer through PLC, so as to achieve accurate printing position positioning and control using the servo motor and cylinder.
It improves the accurate positioning of the printing position, reduces the leakage rate, reduces quality objections caused by marking errors, improves the product quality reputation, and reduces the burden of manual operation.
Smart Images
Figure CN120085692A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of steel plate identification. Background Art
[0002] The identification of the basic information of steel plates can be divided into surface spraying, side spraying, stamping, etc., which are important components of steel production. As an important proof of the identity of steel plates, the identification of basic information of steel plates has various forms. As the production source of steel plates is clearly defined, the length, width, thickness, batch number, etc. of steel plates are clearly marked, facilitating users to quickly connect to the steel plate specifications. The batch number identification on it records the production date, production line number and batch number of the steel plate, providing an important basis for product tracking and quality control. How to efficiently and low-costly perform surface spraying identification of steel plates has gradually become the mainstream of steel production.
[0003] Existing panel printing often has inaccurate positioning of the printing position and a missing spraying rate, resulting in quality objections caused by identification errors.
[0004] The technical problem to be solved by the present invention is: how to provide a control method for surface spraying of stainless steel plates with accurate printing position positioning.
[0005] The technical solution adopted by the present invention is: a control method for surface spraying of stainless steel plates, which is carried out according to the following steps Step 1: Confirm the printing information on the HMI computer operation interface. The HMI computer is installed in the centralized control room. The HMI computer is signal-connected to the PLC and the small character inkjet printer. The PLC sends production information to the HMI computer. The production information includes the width information and thickness information of the steel plate to be processed. The HMI computer calculates the printing position information of the steel plate to be processed according to the width information and printing information of the steel plate to be processed. The printing information includes the graphic and text information to be printed. When the HMI computer receives the information that a certain steel plate on the roller path is about to arrive sent by the PLC, a prompt of whether to print appears on the HMI computer operation interface. If printing is not required, the staff selects "No" and waits for the information that the next steel plate is about to arrive. If printing is required, the staff selects "Yes" and proceeds to the following steps; Step 2: The HMI computer sends the steel plate printing information to the small character inkjet printer; Step 3: The HMI computer sends the steel plate width data to the PLC. The PLC calculates the distance that the servo motor needs to move. The servo motor is connected to the small character inkjet printer. The servo motor drives the small character inkjet printer to move horizontally and vertically within the plane range under manual or PLC control; Step 4: The servo motor drives the small character inkjet printer to move to the predetermined position under manual or PLC control, and feeds back the position signal to the PLC; Step 5: Detection of steel plate in place. A front photoelectric sensor and a rear photoelectric sensor are installed below the entrance of the identification process of the roller table to determine the moving direction of the steel plate. When the front photoelectric sensor and the rear photoelectric sensor detect the arrival of the steel plate, they send a signal that the steel plate is transported to the identification process to the PLC, and at this time, the steel plate is transported to the identification process; Step 6: Transmission of the steel plate in-place signal to the PLC. A position photoelectric sensor is installed at a position corresponding to and parallel to the cylinder above the roller table. When the position photoelectric sensor detects the steel plate, it sends the steel plate in-place signal to the PLC; Step 7: After the PLC receives the steel plate in-place signal, it controls the cylinder to descend. The encoder and the small character inkjet printer connected to the cylinder also descend together. After the encoder touches the steel plate, the encoder starts to work, and the small character inkjet printer reaches the predetermined printing position and starts to work. The predetermined position and the predetermined printing position coincide in the projection on the same horizontal plane; Step 8: After the printing is completed, the cylinder rises Step 9: Wait for the arrival of the next steel plate.
[0006] An upper magnetic switch is installed at the upper limit position of the cylinder's movement, and a lower magnetic switch is installed at the lower limit position of the cylinder's movement. The horizontal movement of the servo motor is carried out on the horizontal track, and the vertical movement of the servo motor is carried out on the vertical track. A horizontal head proximity switch and a horizontal tail proximity switch are installed at both ends of the horizontal track, and a vertical head proximity switch and a vertical tail proximity switch are installed at both ends of the vertical track. A horizontal travel switch and a vertical travel switch are installed on the servo motor.
[0007] The beneficial effects of the present invention are as follows: The present invention improves the accurate positioning of the printing position, reduces the surface spraying and leakage spraying rate, reduces the quality objections caused by identification errors, and improves the quality reputation of the company's products. It reduces manual operation, lightens the work burden, and improves work efficiency. The device involved in the present invention has a simple structure, can be directly purchased in the market, has a low maintenance cost, strong practicability, and has strong promotion value, and can also be applied to other production fields. Description of the Drawings
[0008] Figure 1 is the process schematic diagram of the present invention; Figure 2 is the device and connection schematic diagram involved in the present invention; Figure 3 is the front view schematic diagram of the device involved in the present invention; Figure 4 is the side view schematic diagram of the device involved in the present invention.
[0009] Among them, 1. First travel switch, 2. Second travel switch, 3. First proximity switch, 4. Second proximity switch, 5. Servo motor, 6. First baffle, 7. Second baffle, 6. Cylinder, 9. Roller. Specific implementation mode
[0010] As Figures 1-4 As shown, the present invention provides an automatic spray printing control method for the steel plate surface. The hardware components include: PLC, servo mechanism (servo motor 5, speed reducer, servo driver, etc.), cylinder 6, roller assembly (including roller 9), HMI computer, small character inkjet printer, photoelectric sensor, encoder, proximity switches (the first proximity switch 3 and the second proximity switch 4 on both sides), travel switches (the first travel switch 1 and the second travel switch 2 on both sides), magnetic switches, etc. The PLC, servo driver, switch power supply, buttons, etc. are installed in the electrical cabinet outside the roller path of the marking process. The servo motor, roller assembly, inkjet printer cabinet, and inkjet printer are installed on the crossbeam above the roller path. The PLC is used to collect signals such as photoelectric sensors, proximity switches, encoders, and servo motor step sizes, and at the same time analyze and judge these signals. The HMI computer is installed in the centralized control room and is responsible for collecting the basic data of the steel plate (steel type, specification, production standard, production batch number, etc.) in the information system. The HMI computer and the PLC perform information interaction: the HMI computer sends production information to the PLC through optical fiber and at the same time receives the basic working status of the "servo mechanism centering information" feedback by the PLC. The present invention solves many problems caused by the large changes in the width and thickness range of the steel plate and ensures the normal operation of the marking process.
[0011] The first baffle 6 and the second baffle 7 are for corresponding to the proximity switches and travel switches on both sides to achieve measurement.
[0012] 1) The HMI computer is installed in the centralized control room, mainly used to receive the production data issued by the information system, and transmit the production data to the small character inkjet printer (both ends of the communication line are connected through an RS422 serial converter); the HMI computer calculates the printing position of the basic information of the steel plate according to the width of the steel plate, and then sends the "printing position" information to the PLC. The PLC drives the motor to work accordingly. After the motor arrives, the PLC sends the arrival signal to the HMI computer.
[0013] 2) The PLC, servo driver, buttons, and DIP switches are installed in the electrical cabinet on one side of the roller path. The on-site operator can perform fine-tuning of the "printing position" and emergency handling through the "buttons, DIP switches".
[0014] 3) The photoelectric sensors (front) and photoelectric sensors (rear) are installed under the roller table and are used to judge the moving direction of the steel plate; the photoelectric sensor (steel plate in place) is installed above the roller table crossbeam and is parallel to the cylinder. When it detects that the steel plate is transported under the inkjet printer nozzle, the PLC controls the cylinder to start descending. After the roller contacts the steel plate, it drives the encoder to start working. After reaching the predetermined position, the PLC outputs a start printing signal to the inkjet printer, and the inkjet printer starts working. After the printing is completed, the cylinder rises and waits for the arrival of the next steel plate.
[0015] 4) In order to limit the up and down movement distance of the cylinder, magnetic switches are installed on the upper and lower sides of the cylinder respectively; in addition, in order to prevent accidents when the servo motor moves left and right, proximity switches and travel switches are installed at the ends of the crossbeam above the roller table respectively.
[0016] Specific operation process description: Confirm the printing information on the HMI computer operation interface.
[0017] The basic information of the steel plate is sent to the inkjet printer.
[0018] The steel plate width data is sent to the PLC, and the PLC calculates the moving distance of the servo motor.
[0019] The servo motor starts working and feeds back the position signal to the PLC after reaching the predetermined position.
[0020] 5) Steel plate in-place detection: The steel plate is transported to the marking process.
[0021] 6) The steel plate in-place signal is input into the PLC.
[0022] 7) The cylinder descends, the encoder starts working, and when it reaches the predetermined printing position, the PLC triggers the inkjet printer to start working.
[0023] 8) After the printing is completed, the cylinder rises.
[0024] 9) Wait for the arrival of the next steel plate.
[0025] The present invention has been stably operating on the Taigang Hot Rolling 2300 production line for more than 3 years and has currently been installed on the new Hot Rolling 4300 line.
Claims
1. A method for controlling inkjet printing on a stainless steel plate, characterized in that: Follow the steps below Step 1: Confirm the printing information on the HMI computer operation interface. The HMI computer is installed in the centralized control room. The HMI computer signal is connected to the PLC and the small character inkjet printer. The PLC sends the production information to the HMI computer. The production information includes the width information and thickness information of the steel plate to be processed. The HMI computer calculates the printing position information of the steel plate to be processed according to the width information and the printing information of the steel plate to be processed. The printing information includes the printed graphic information. When the HMI computer receives the information that a certain steel plate on the roller is about to arrive from the PLC, the HMI computer operation interface pops up whether printing is required. If printing is not required, the staff selects no and waits for the next steel plate to arrive. If printing is required, the staff selects yes and proceeds to the following steps; Step 2: The HMI computer sends the steel plate printing information to the small character inkjet printer; Step 3: The HMI computer sends the steel plate width data to the PLC. The PLC calculates the distance the servo motor needs to move. The servo motor is connected to the small character inkjet printer. The servo motor drives the small character inkjet printer to move horizontally and vertically within the plane range under manual or PLC control. Step 4: The servo motor drives the small character inkjet printer to move to the predetermined position under manual or PLC control, and feeds back the position signal to the PLC; Step 5: Detection of steel plate arrival. A front photoelectric sensor and a rear photoelectric sensor are installed below the entrance of the marking process of the roller to determine the direction of movement of the steel plate. When the front photoelectric sensor and the rear photoelectric sensor detect that the steel plate has arrived, the front photoelectric sensor and the rear photoelectric sensor send a signal to the PLC that the steel plate is being transported to the marking process. At this time, the steel plate is being transported to the marking process. Step 6: The steel plate arrival signal is transmitted to the PLC. A position photoelectric sensor is installed above the roller table at a position corresponding to and parallel to the cylinder. When the position photoelectric sensor detects the steel plate, the position photoelectric sensor sends a steel plate arrival signal to the PLC. Step 7. After receiving the signal that the steel plate is in place, the PLC controls the cylinder to descend, and the encoder and the small character inkjet printer connected to the cylinder descend together. After the encoder contacts the steel plate, the encoder starts to work, and the small character inkjet printer reaches the predetermined printing position. The small character inkjet printer starts to work, and the predetermined position and the predetermined printing position overlap in projection on the same horizontal plane; Step 8: After printing is completed, the cylinder rises Step 9: Wait for the next steel plate to arrive.
2. A method for controlling the inkjet printing of a stainless steel plate according to claim 1, characterized in that: The upper limit of the cylinder movement is installed with an upper magnetic switch, and the lower limit of the cylinder movement is installed with a lower magnetic switch. The lateral movement of the servo motor is carried out on the lateral track, and the longitudinal movement of the servo motor is carried out on the longitudinal track. The two ends of the lateral track are installed with lateral head proximity switches and lateral tail proximity switches, and the two ends of the longitudinal track are installed with longitudinal head proximity switches and longitudinal tail proximity switches. The servo motor is installed with lateral travel switches and longitudinal travel switches.