A control method for preventing strip steel from colliding with the electrode wheel of a narrow lap welder

Abstract

The present invention relates to the technical field of narrow lap welding machine equipment in the entrance area of a cold rolling processing line, and specifically discloses a control method for preventing strip steel from colliding with an electrode wheel of a narrow lap welding machine. A DP / DPCOUBLE coupler is used to receive and send data between a PLC control system of the narrow lap welding machine and a PLC control system at the entrance of a production line. When the narrow lap welding machine at the entrance executes a welding sequence, the PLC control system at the entrance of the production line receives a "welding completed" instruction, and then starts a tensioning function. After tensioning is completed, the PLC control system is associated with a sequential controller of the narrow lap welding machine. After receiving the "welding completed" instruction, the PLC control system at the entrance of the production line starts a common channel positioning function, and accurately stops at the center of the crescent shear of the narrow lap welding machine. The present invention avoids the collision between the electrode wheel on the C-frame trolley of the narrow lap welding machine and the strip steel, thereby effectively ensuring the continuous and reliable operation of the narrow lap welding machine.

Description

Technical Field

[0001] The invention relates to the technical field of narrow lap welder equipment in an entrance area of a cold rolling processing line, and in particular to a control method for preventing a steel strip from colliding with an electrode wheel of a narrow lap welder. Background Art

[0002] Cold-rolled processing lines use narrow lap welding technology to join strips end to end, a critical piece of equipment necessary for continuous production. If a weld fails (the front and rear strips are not welded), the automatic sequencer opens the clamps after welding. Due to the presence of overlapping strips at the welder's inlet and outlet, the strip ends are automatically removed and inserted into the welder's operating channel. The welder's C-frame carriage automatically retracts from the drive side to the operating side (WS), causing it to collide with the strips on either side. This collision can cause the electrode head assembly to deform and shift, resulting in a serious weld failure. The machine must be shut down to replace the electrode head assembly and fine-tune the mechanical accuracy, requiring downtime of over 10 hours. Current narrow lap control technology does not account for the technical flaw in the welder's automatic sequence control, which can cause the strip to collide with the electrode wheel after a weld fails. This makes it difficult for operators to control this issue alone. Therefore, it is necessary to design a control method to prevent the strip from colliding with the electrode wheel of the narrow lap welder, specifically a control method to prevent the electrode wheel on the C-frame trolley of the narrow lap welder in the cold rolling processing line from colliding with the strip. This has solved the problem of strip collision after welding failure of the narrow lap welder at the existing entrance. Summary of the Invention

[0003] In view of the problems existing in the prior art, the object of the present invention is to provide a control method for preventing strip steel from colliding with the electrode wheel of a narrow lap welder.

[0004] The technical solution adopted by the present invention to solve the technical problem is: a control method for preventing strip steel from colliding with the electrode wheel of a narrow lap welder, comprising the following steps:

[0005] 1) The narrow lap welder PLC control system is used as the substation control system, and the narrow lap welder is equipped with a sequence controller; the production line entrance PLC control system is used as the main station control system, and is equipped with positioning control function and tension control function;

[0006] 2) Data is received and sent between the narrow lap welding machine PLC control system and the production line entrance PLC control system through the DP / DP COUBLE coupler;

[0007] 3) When the narrow lap welder at the entrance executes the welding sequence, after the PLC control system at the production line entrance receives the "welding completed" instruction from the narrow lap welder PLC control system, the PLC control system at the production line entrance starts the sheet building function. After the sheet building is completed, the PLC control system at the production line entrance sends the "sheet building completed" signal to the narrow lap welder PLC control system and associates it with the sequence controller of the narrow lap welder;

[0008] 4) When the narrow lap welder at the entrance executes the welding sequence, after the PLC control system at the entrance of the production line receives the "welding completed" instruction from the PLC control system of the narrow lap welder, the PLC control system at the entrance of the production line controls the weld to run from the narrow lap welder to the shearing position of the crescent shear of the narrow lap welder in front, and starts the public channel positioning function, accurately stopping at the center of the crescent shear of the narrow lap welder. At this time, the "positioning completed" signal is sent to the PLC control system of the narrow lap welder and associated with the sequential controller of the narrow lap welder.

[0009] Specifically, the "positioning completed" signal and the channel "establishment completed" signal in the PLC control system at the entrance of the production line are associated with the sequential control step of the sequential controller of the narrow lap welding machine. Only when the "positioning completed" and channel "establishment completed" signals of the PLC control system at the entrance of the production line are satisfied at the same time, the narrow lap welding machine PLC control system is allowed to control the C-frame trolley of the narrow lap welding machine, and the sequential control step in the driving side DS automatically returns to the operating side WS for activation.

[0010] Specifically, the automatic control system of the narrow lap welder in step 1) mainly includes a narrow lap welder PLC control system, an HMI human-machine interface, a communication module DP / DP COUBLE coupler, and a C-frame trolley driven by a servo motor.

[0011] Specifically, the C-frame trolley driven by the servo motor receives instructions from the positioning module QD77MS2, the motor encoder of the servo motor is connected to the servo controller to receive and send data, and the positioning module controls the operation of the servo controller.

[0012] Specifically, the positioning module completes the positioning function of the C-frame trolley of the narrow lap welder, and the positioning module exchanges data with the PLC control system of the narrow lap welder and sends a "positioning completed" signal.

[0013] Specifically, the tensioning function in step 3) is to perform tensioning at the head and tail of the strip weld. When the tension value set in the production line inlet channel is equal to the actual feedback tension value, the tensioning is completed and the weld quality is intact.

[0014] The present invention has the following beneficial effects:

[0015] The control method for preventing the steel strip from colliding with the electrode wheel of the narrow lap welder designed by the present invention is based on the sequential controller of the original narrow lap welder control system. The narrow lap welder C-frame trolley in the sequential control step automatically returns from the driving side (DS) to the operating side (WS), thereby adding a safety protection function for the electrode wheel; in the automatic mode, when the welding of the front and rear strip steels fails, the electrode wheel on the narrow lap welder C-frame trolley is prevented from colliding with the steel strip, effectively protecting the electrode head assembly of the narrow lap welder, and effectively ensuring the continuous and reliable operation of the narrow lap welder. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the structural diagram of the C-frame trolley body of the narrow lap welding machine.

[0017] Figure 2 It is a schematic diagram of the control composition for preventing the strip from colliding with the electrode wheel of the narrow lap welding machine.

[0018] Figure 3 It is the process of collecting servo motor operation request and position control data of narrow lap welding machine PLC control system.

[0019] Figure 4 This is the principle of the electrode wheel safety protection function in the sequence controller of the narrow lap welding machine.

[0020] In the figure: 1-electrode wheel; 2-forging roller. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely further describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] like Figure 1-4 As shown, a control method for preventing the steel strip from colliding with the electrode wheel of the narrow lap welder is aimed at an equipment accident in which the steel strip collides with the electrode wheel of the narrow lap welder when the welding of the front and rear strips of the narrow lap welder fails (weld cracks) and the C-frame trolley of the narrow lap welder automatically returns from the driving side to the operating side.

[0023] The primary automatic control system of the narrow lap welding machine mainly includes the Mitsubishi GX series narrow lap welding machine PLC control system, the C-frame trolley driven by the servo motor, the HMI human-machine interface (host computer), and the communication module DP / DP COUBLE coupler.

[0024] The motor encoder attached to the servo motor is connected to the servo controller via a dedicated cable to receive and send data.

[0025] The C-frame trolley driven by the servo motor receives instructions from the positioning module QD77MS2, which controls the operation of the servo controller.

[0026] The positioning module QD77MS2 exchanges data with the Mitsubishi narrow lap welder PLC control system through the Mitsubishi dedicated substrate. The narrow lap welder PLC control system reads the relevant parameters of the servo controller and sends relevant instructions. At the same time, the servo controller obtains the status of the positioning module of the narrow lap welder PLC control system and feeds back the C-frame trolley position data to the PLC.

[0027] The PLC control system at the entrance of the production line and the PLC control system of the narrow lap welding machine receive and send data through the DP / DP COUBLE coupler.

[0028] Embodiments of the present invention: Specific implementation method:

[0030] Combine Figure 2 System control diagram, the control system mainly consists of narrow lap welding machine PLC control system ①, master station communication module (QJ71PB92V) ②, Siemens communication module DP / DP COUBLE coupler ③, production line entrance PLC control system (Siemens STEP7400)) ④.

[0031] Combine Figure 3 The servo drive motor ⑤ and the servo motor encoder ⑥ are connected to the servo controller ④ through a dedicated cable. The servo controller ④ receives the data and transmits it to the positioning module QD77MS2 ③.

[0032] The positioning module QD77MS2③ requests and sends the request to the sequence controller② of the narrow lap welding machine to realize the operation control of the servo motor⑤.

[0033] Combine Figure 4 To further illustrate, the production line entrance PLC control system ② and the narrow lap welding machine PLC control system ① send and receive data via the Siemens communication module DP / DP COUBLE coupler ③.

[0034] The narrow lap welder PLC control system ① collects data from the production line entrance PLC control system ② and associates the data with the narrow lap welder's sequence controller ⑥ to control the operation of the servo motor.

[0035] The weld seam moves from the welder to the shearing position of the front crescent shear, stopping precisely at the center of the crescent shear. The positioning completion signal (4) is sent to the sequence controller (6) of the narrow lap welder via the DP communication protocol (3).

[0036] After welding is completed, when the set tension value is equal to the actual tension value, the "tension establishment completed" signal ⑤ of the PLC control system ② channel at the entrance of the production line is sent to the sequence controller ⑥ of the narrow lap welder through the DP communication protocol ③ DP / DP COUBLE coupler.

[0037] Positioning is completed ④ and the entrance channel "establishment is completed" ⑤ is associated with the sequential controller ⑥ of the narrow lap welding machine. Only when both ④ and ⑤ are met at the same time, the narrow lap welding machine PLC control system is allowed to control the C-frame trolley of the narrow lap welding machine, and automatically return from the drive side (DS) to the sequential control step activation in the operating side (WS).

[0038] The present invention is not limited to the above-mentioned embodiments. Anyone should be aware that any structural changes made under the guidance of the present invention, and any technical solutions that are the same or similar to those of the present invention, fall within the scope of protection of the present invention.

[0039] The technology, shape, and structure not described in detail in the present invention are all well-known technologies.

Claims

1. A control method for preventing steel strip from colliding with the electrode wheel of a narrow lap welder, characterized in that: The following steps are involved: 1) The automatic control system of the narrow lap welder includes the narrow lap welder PLC control system, HMI human-machine interface, communication module DP / DPCOUBLE coupler and C-frame trolley driven by servo motor. The narrow lap welder PLC control system serves as the substation control system and is equipped with a sequence controller; the production line entrance PLC control system serves as the main station control system and is equipped with positioning control and tension control functions; 2) Data is received and sent between the narrow lap welding machine PLC control system and the production line entrance PLC control system through the DP / DP COUBLE coupler; 3) When the narrow lap welder at the entrance executes the welding sequence, the PLC control system at the production line entrance receives the "welding completed" command from the narrow lap welder PLC control system, and then starts the setup function. After the setup is completed, the PLC control system at the production line entrance sends the "setup completed" signal to the narrow lap welder PLC control system and associates it with the sequence controller of the narrow lap welder. 4) When the narrow lap welder at the entrance executes the welding sequence, after the PLC control system at the entrance of the production line receives the "welding completed" command from the PLC control system of the narrow lap welder, the PLC control system at the entrance of the production line controls the weld to run from the narrow lap welder to the shearing position of the crescent shear of the narrow lap welder in front, and starts the public channel positioning function, accurately stopping at the center of the crescent shear of the narrow lap welder. At this time, the "positioning completed" signal is sent to the PLC control system of the narrow lap welder and associated with the sequential controller of the narrow lap welder; the "positioning completed" signal and the channel "opening completed" signal in the PLC control system at the entrance of the production line are associated with the sequential control step of the sequential controller of the narrow lap welder. Only when the "positioning completed" and channel "opening completed" signals of the PLC control system at the entrance of the production line are met at the same time, the PLC control system of the narrow lap welder is allowed to control the C-frame trolley of the narrow lap welder, and the drive side DS automatically returns to the sequential control step activation in the operation side WS.

2. The control method for preventing steel strip from colliding with the electrode wheel of a narrow lap welder according to claim 1, characterized in that: The C-frame trolley driven by the servo motor receives instructions from the positioning module QD77MS2. The motor encoder of the servo motor is connected to the servo controller to receive and send data, and the positioning module controls the operation of the servo controller.

3. The control method for preventing the steel strip from colliding with the electrode wheel of the narrow lap welder according to claim 2, characterized in that: The positioning module completes the positioning function of the C-frame trolley of the narrow lap welder. The positioning module exchanges data with the PLC control system of the narrow lap welder and sends a "positioning completed" signal.

4. The control method for preventing steel strip from colliding with the electrode wheel of a narrow lap welder according to claim 1, characterized in that: The tensioning function in step 3) is to perform tensioning at the head and tail of the strip weld. When the tension value set in the production line entrance channel is equal to the actual feedback tension value, the tensioning is completed and the weld quality is intact.

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