A manufacturing system for quick online adjustment of cold-formed steel

Abstract

The application provides a kind of cold bending type steel quick online adjustment manufacturing system, including square rectangular tube production line;Steel coil unwinding unit, shearing butt welding unit, loop storage unit, fixed-length sawing unit, automatic collection unit and automatic packing unit are integrated with corresponding control system;It also includes host computer and PLC, the PLC includes multiple, with rough forming unit, high-frequency welding unit, sizing and finishing unit and square rectangular tube production line host one-to-one corresponding setting;The host computer is used to receive external instructions and send it to the corresponding PLC, the PLC is used to control rough forming unit, high-frequency welding unit, sizing and finishing unit and square rectangular tube production line host drive rotating speed according to external instructions respectively;The host computer is also used to control the corresponding control system of steel coil unwinding unit, shearing butt welding unit, loop storage unit, fixed-length sawing unit, automatic collection unit and automatic packing unit.The application can realize the full-line linkage control of square rectangular tube production line.

Description

Technical Field

[0001] This invention belongs to the field of cold-formed steel pipe manufacturing technology, specifically relating to a manufacturing system for rapid online adjustment of cold-formed steel sections. Background Technology

[0002] Cold-formed steel has been used worldwide for over a century. By the 1980s, the number of manufacturers had increased, product specifications and models had become more numerous, equipment and processes had become increasingly complex, and material properties had become increasingly demanding. The requirements for production operators in product manufacturing, adjustment, debugging, and process control had become increasingly stringent.

[0003] After nearly 20 years of development, although the number of manufacturing enterprises has increased and the level of equipment automation has improved, product manufacturing adjustments still mainly rely on human experience. Adjustments for each batch of products take a long time, resulting in a relatively high scrap rate. Currently, the widely used square and rectangular tube production lines typically require 18 runs for forming, with strip steel rolled through rollers. Each run requires adjusting data from over 100 parts, including the relative positions of the upper, side, and lower rollers, gaps, feed rate, rolling speed, welding voltage, welding current, and sizing amount. During normal production, if product quality changes or becomes substandard, rapid online adjustments are needed to reduce the scrap rate. Although some PLC functions are now used in equipment manufacturing, the large number of parameters and the lack of true matching between equipment linkage and operation mean that the application of parameterized adjustment systems for cold-formed steel manufacturing remains limited and immature. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the aforementioned background technology and provide a manufacturing system for rapid online adjustment of cold-formed steel, which can realize full-line linkage control of square and rectangular tube production lines and improve production efficiency.

[0005] The technical solution adopted in this invention is: a manufacturing system for rapid online adjustment of cold-formed steel, including a rectangular tube production line; the rectangular tube production line sequentially includes a steel coil uncoiling unit, a shearing and welding unit, a looper storage unit, a rough forming unit, a high-frequency welding unit, a sizing and precision forming unit, a length sawing unit, an automatic collection unit, and an automatic packaging unit; wherein, the steel coil uncoiling unit, shearing and welding unit, looper storage unit, length sawing unit, automatic collection unit, and automatic packaging unit are all integrated with corresponding control systems; it also includes a host computer and a PLC; the PLC includes multiple PLCs, each corresponding to one of the host units of the rough forming unit, high-frequency welding unit, sizing and precision forming unit, and rectangular tube production line; the host computer is used to receive external instructions and send them to the corresponding PLCs, and the PLCs are used to control the transmission speed of the host units of the rough forming unit, high-frequency welding unit, sizing and precision forming unit, and rectangular tube production line according to the external instructions; the host computer is also used to control the corresponding control systems of the steel coil uncoiling unit, shearing and welding unit, looper storage unit, length sawing unit, automatic collection unit, and automatic packaging unit.

[0006] The above technical solution also includes a frequency converter. The signal output terminal of the PLC is electrically connected to the signal input terminal of the frequency converter, and the output terminal of the frequency converter is electrically connected to the motor and gearbox of the main unit of the square and rectangular tube production line. The PLC controls the motor and gearbox of the main unit of the square and rectangular tube production line through the frequency converter, thereby controlling the transmission speed of the main unit of the square and rectangular tube production line.

[0007] The above technical solution also includes a servo driver and a servo motor; the signal output terminal of the PLC is electrically connected to the signal input terminal of the servo driver, the signal output terminal of the servo driver is electrically connected to the signal input terminal of the servo motor, and the output terminal of the servo motor controls the position of the rolls in the rough forming unit and the sizing and finishing forming unit.

[0008] In the above technical solution, the frequency converter integrates an encoder, which is used to record the rotational speed of the motor of the main machine of the square and rectangular tube production line and feed it back to the PLC.

[0009] In the above technical solution, the servo motor integrates an absolute encoder, which is used to record the actual position of the corresponding roller of the servo motor and feed it back to the PLC.

[0010] The above technical solution also includes: a computer touch screen that communicates with the host computer; the computer touch screen is used to receive external control commands and send them to the host computer; each PLC is equipped with a tablet computer and a remote control, which communicate with the corresponding PLC and the host computer respectively; both the tablet computer and the remote control are used to receive external control commands and send them to the PLC.

[0011] In the above technical solution, the host computer controls the corresponding control systems of the steel coil uncoiling unit, shearing and welding unit, loop storage unit, fixed-length sawing unit, automatic collection unit and automatic packaging unit through distributed I / O.

[0012] In the above technical solution, the host computer stores the roll parameters for each stand required for different types and specifications of products; the host computer determines the specifications of the product to be produced based on externally input instructions and sends corresponding parameter control instructions to the PLC; the PLC controls the servo drive to operate according to the parameter control instructions, the servo drive controls the servo motor to run, and the absolute encoder of the servo motor records the number of revolutions. After reaching the specified number of revolutions for the corresponding roll parameters, it feeds back to the servo drive, and the servo drive controls the servo motor to stop; the operator measures and confirms the roll spacing of each stand and inputs fine-tuning instructions using a tablet computer; the host computer controls the corresponding servo motor to perform fine-tuning based on the fine-tuning instructions.

[0013] In the above technical solution, the roll structure of the rough forming unit and the sizing and finishing forming unit includes a gate, an upper roll, a lower roll and two side rolls; one side roll is connected to the upper roll and the other side roll is connected to the lower roll; the upper roll and its connected side roll are controlled by a servo motor to move up and down as a whole and move laterally individually; the lower roll and its connected side roll have a constant height and move laterally individually by a servo motor to drive the worm gear screw.

[0014] In the above technical solution, after the square and rectangular tube production line is started, when the appearance size or radius of the product to be produced changes, the operator can input a fine-tuning command using a remote control based on the appearance size of the product without stopping the machine; the PLC controls the corresponding servo motor to adjust the spacing of the corresponding stand of rollers based on the fine-tuning command.

[0015] The beneficial effects of this invention are as follows: This invention connects the control units of each process according to the cold-formed steel profile forming process, and achieves automated control of each link in the production line by adding an automatic roll adjustment and changing control system, a main drive control system, and a high-frequency welding machine control system. The rough forming section and the finishing forming section of this invention each use an independent PLC, but they can also be linked for convenient operation and monitoring. Each set is equipped with a touch screen and a wireless operating controller. During the inspection process, if the operator finds that the product is unqualified, they can use the mobile touch screen to adjust the rough forming and finishing forming at any time, reacting quickly. The forming roll pressing method can realize electric and manual fine-tuning functions; the vertical roll adjustment can realize electric simultaneous opening and closing, vertical lifting, and horizontal synchronous linkage adjustment. The movement of all rolls and the vertical adjustment of the upper horizontal roll are automatically controlled by PLC and servo motors, and the adjustment position is displayed on the touch screen or tablet computer of the main computer. A handheld industrial wireless remote control or a mobile iPad is used to replace the buttons on the original button station, allowing for more intuitive online real-time parameter adjustment and making operation more convenient. By storing, statistically analyzing, and processing multiple batches of production data, a large dataset of adjustment parameters can be generated. This allows for further optimization of parameters, thereby improving production stability and enabling rapid switching between product specifications and standardized production. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the system of the present invention;

[0017] Figure 2 This is a schematic diagram of the square and rectangular tube production line in this specific embodiment;

[0018] Figure 3 This is a schematic diagram of the first bend roll structure in this specific embodiment;

[0019] Figure 4 This is a schematic diagram of the second bend roll structure in this specific embodiment;

[0020] Figure 5 This is a schematic diagram of the closed-hole roll structure in this specific embodiment;

[0021] Figure 6 This is a schematic diagram of the sizing roll structure in this specific embodiment;

[0022] Figure 7 This is a schematic diagram of the operation flow of this specific embodiment.

[0023] Among them, 1-coil uncoiling unit, 2-shearing and welding unit, 3-loop storage unit, 4-rough forming unit, 5-high frequency welding unit, 6-sizing and precision forming unit, 7-sizing and sawing unit, 8-automatic collection unit, 9-automatic packaging unit, 10-first bend angle roll structure, 11-second bend angle roll structure, 12-closed hole roll structure, 13-sizing roll structure, 14-servo motor. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but these descriptions do not constitute a limitation on the present invention.

[0025] like Figure 1 As shown, this invention provides a manufacturing system for rapid online adjustment of cold-formed steel, including a rectangular tube production line. The rectangular tube production line sequentially includes a steel coil uncoiling unit, a shearing and welding unit, a looper storage unit, a rough forming unit, a high-frequency welding unit, a sizing and finishing unit, a length-cutting unit, an automatic collection unit, and an automatic packaging unit. Each of these units integrates a corresponding control system. The system also includes a host computer and multiple PLCs, each corresponding to one of the main units in the rough forming unit, high-frequency welding unit, sizing and finishing unit, and the rectangular tube production line. The host computer receives external commands and sends them to the corresponding PLCs. The PLCs control the transmission speeds of the main units in the rough forming unit, high-frequency welding unit, sizing and finishing unit, and the rectangular tube production line according to the external commands. The host computer also controls the corresponding control systems of the steel coil uncoiling unit, shearing and welding unit, looper storage unit, length-cutting unit, automatic collection unit, and automatic packaging unit. The PLC controls the timing of the high-frequency welding unit's actions.

[0026] As shown in Figure 2, in this specific embodiment, the square and rectangular tube production line sequentially includes a steel coil uncoiling unit, a shearing and welding unit, a loop storage unit, a rough forming unit, a high-frequency welding unit, a sizing and precision forming unit, a length sawing unit, an automatic collection unit, and an automatic packaging unit. The rough forming unit and the sizing and precision forming unit integrate servo drives and servo motors.

[0027] The rough forming unit and the sizing and finishing unit each use an independent PLC, but they can also be linked for convenient operation and monitoring. Each unit is equipped with a touch screen and a wireless operating controller. If operators find any defects in the product during the inspection process, they can use the mobile touch screen to adjust the rough forming and finishing units at any time and react quickly.

[0028] The signal output terminals of the PLCs for the rough forming unit and the sizing and finishing forming unit are electrically connected to the signal input terminals of the corresponding servo drivers. The signal output terminals of the servo drivers are electrically connected to the signal input terminals of the servo motors. The output terminals of the servo motors control the position of the rolls in the rough forming unit and the sizing and finishing forming unit.

[0029] For the rough forming unit, when changing product specifications during production, the rolls only need to move within the frame without needing to be replaced. The movement is controlled by a servo motor, automatically adjusting the position. The flat roll pressing method allows for electric and manual fine-tuning (AC servo, with electric strip pressing function); the vertical roll adjustment allows for simultaneous electric opening and closing, vertical lifting, and synchronous left and right linkage adjustment (with adjustment function during strip production). All roll movement and the vertical adjustment of the upper horizontal roll are automatically controlled by PLC and servo motors, with the adjustment position displayed on a digital screen.

[0030] Both the first and second bend forming rollers adopt equal rigidity frames. This closed plate structure design ensures that the forming force in the horizontal direction is absorbed by the inside of the frame. The archway frame does not bear the horizontal load-bearing force, but only the vertical positive pressure and the thrust along the direction of the steel pipe's movement.

[0031] The front and top views of the first curved roll structure are as follows: Figure 3 As shown, the first bend is formed using 5 horizontal frames; the fourth frame of the first bend is a four-roll type, with two different R-value rolls designed for the upper rolls according to the wall thickness, and two sets of upper roll shaft assembly systems are provided for quick hoisting and replacement. There is a forming vertical roll after the first frame of the first bend.

[0032] The front and top views of the second curved roll structure are as follows: Figure 4 As shown, the second bend is formed using six horizontal frames: the fourth frame of the second bend is a four-roll type, with two different R-value rolls designed for the upper rolls according to the wall thickness, and two sets of upper roll shaft assembly systems are provided for quick hoisting and replacement. The fifth and sixth frames of the second bend adopt an inclined roll structure, longitudinally arranged, with alternating left and right forming. The upper rolls are designed with two different R-value rolls according to the wall thickness, and two sets of upper roll shaft assembly systems are provided for quick hoisting and replacement. The first frame of the second bend has forming vertical rolls at the front and rear, and the remaining adjacent two horizontal roll frames are all supported by lower support rolls, for a total of five support rolls.

[0033] There are three forming vertical rollers, which play a role in centering and guiding during the forming process and preventing rebound after forming. The three vertical rollers are located behind the first flat roller at the first bend and in front of and behind the first flat roller at the second bend. The vertical rollers can be adjusted electrically to open and close simultaneously, lift up and down, and adjust left and right synchronously (with adjustment function in strip steel production).

[0034] The front and side views of the closed-hole roll structure are as follows: Figure 5As shown, the closed-hole forming flat roller is processed in 3 passes. The structure adopts a flat-vertical cross-roller structure. There are six sets of side vertical rollers, two sets per pass, arranged laterally on both sides; six sets of upper horizontal pressure rollers are arranged longitudinally on both sides above the side vertical rollers, and there are passive flat support rollers below the upper horizontal pressure rollers; three sets of lower horizontal rollers are arranged in the same cross section as the side vertical rollers, and the lower horizontal rollers are driven by power.

[0035] For the sizing and finishing unit, the five sizing flat rolls are divided into two types. The 1st, 2nd, 3rd, and 5th shaping flat rolls employ a non-changing roll process. Their structure consists of one side roll connected to the upper roll seat and another side roll connected to the lower roll seat. The upper roll and its connected side roll can be raised and lowered as a whole under the action of a worm gear screw, and the upper and side rolls can also move laterally independently. The lower roll and its connected side roll maintain a constant height, but the lower and side rolls can move laterally independently. The upper roll's height adjustment, the side rolls' left and right adjustment, and the lateral adjustment of both the upper and lower rolls are all electrically adjustable (AC servo, with strip electric pressing function). During production of all specifications, only the relative positions of the individual rolls need to be adjusted; the rolls are interchangeable. The upper and lower shafts are driven by AC variable frequency motors.

[0036] The fourth sizing roller adopts a traditional form, and its top and side views are as follows: Figure 6 As shown, the side rollers are of a "suspended" type. When the product angle cannot meet the specified requirements, the lead screws at both ends of the side roller shaft can be manually adjusted to change the angle between the side roller shaft and the horizontal direction, thereby adjusting the product angle and flatness. The upper roller is electrically adjustable. The upper and lower rollers are interchangeable for all specifications. The upper roller is adjusted according to the product height, while the side rollers must be replaced when the product height changes. The upper and lower shafts are driven by an AC variable frequency motor.

[0037] The roll structures for both the rough forming unit and the sizing and finishing forming are existing technologies. This invention redesigns the original manually adjustable part to be driven by a servo motor.

[0038] Specifically, it also includes a frequency converter. The signal output terminal of the PLC is electrically connected to the signal input terminal of the frequency converter, and the output terminal of the frequency converter is electrically connected to the motor and gearbox of the main unit of the rectangular tube production line. The PLC controls the motor and gearbox of the main unit of the rectangular tube production line through the frequency converter, thereby controlling the transmission speed of the main unit of the rectangular tube production line. The frequency converter integrates an encoder, which is used to record the speed of the motor of the main unit of the rectangular tube production line and feed it back to the PLC.

[0039] The main drive adopts a separate drive mode. Since the bottom diameter of each rolled tube may differ and the number of motors is relatively large, the requirement for synchronization of linear speed between the rolls is high. Therefore, an AC drive mode is selected, using a Siemens frequency converter with encoder feedback as the drive unit. Speed ​​setting and start / stop control are achieved through bus control, ensuring accuracy in the speed setting stage. Simultaneously, the electronic speed ratio of each motor can be easily adjusted via a tablet computer. The encoder speed feedback closed-loop control method ensures the speed regulation accuracy of each motor, with a debugging accuracy of less than 1%, and improves the accuracy of motor speed regulation. It also ensures the torque characteristics of the motors under low-speed operation.

[0040] Specifically, the servo motor integrates an absolute encoder, which is used to record the actual position of the corresponding roller of the servo motor and feed it back to the PLC.

[0041] Specifically, it also includes a computer touch screen that communicates with the host computer; the computer touch screen is used to receive external control commands and send them to the host computer; each PLC is equipped with a tablet computer and a remote control, which communicate with the corresponding PLC and the host computer respectively; both the tablet computer and the remote control are used to receive external control commands and send them to the PLC.

[0042] The host computer controls the corresponding control systems of the steel coil uncoiling unit, shearing and welding unit, loop storage unit, fixed-length sawing unit, automatic collection unit and automatic packaging unit through distributed I / O.

[0043] The usage process of this specific embodiment is as follows: Figure 7 As shown, the host computer stores the roll parameters for each stand required for different types and specifications of products. Based on externally input instructions, the host computer determines the specifications of the product to be produced. The operator retrieves the roll parameters for each stand for that specification stored in the host computer and initiates one-button roll adjustment on the host computer's touchscreen. The host computer connects to the PLC via a communication system and sends corresponding parameter control commands to the PLC. The PLC controls the servo drive according to the parameter control commands, and the servo drive controls the servo motor. The absolute encoder of the servo motor records the number of revolutions; once the specified number of revolutions for the corresponding roll parameters is reached, it feeds back to the servo drive, which then stops the servo motor. The operator measures and confirms the roll spacing for each stand and inputs fine-tuning commands using a tablet computer. The host computer controls the corresponding servo motor to perform fine-tuning based on the fine-tuning commands until the standard parameters are achieved. Compared to the traditional offline method of opening each stand, changing rolls, and adjusting the spacing offline, this method reduces the number of roll loading personnel by 3 and saves more than 8 hours of roll changing time.

[0044] This specific embodiment uses a PLC as the control core, various touch screens as the human-machine interface, and servo motors and controllers as the execution components. The encoder of the servo motor is an absolute encoder. The PLC exchanges data and controls the servo controller through Profinet. This ensures speed and accuracy in the roll adjustment process and has an absolute position memory function.

[0045] Each PLC's tablet computer touchscreen, as well as the touchscreen integrated into the host computer, can display the absolute position of each roll in real time. It can also display, record, modify, and save the position and die data of each roll in each frame during the production of each product specification. The position data of the rolls corresponding to each tube type can be exported as a table to a USB flash drive via the USB port on the touchscreen. Automatic / manual adjustment of the roll die can also be performed via the touchscreen. When producing a specific product model, simply input the parameters for that product on the touchscreen to retrieve the corresponding roll die data. Then, with a single button press, the PLC will control the servo motors to automatically adjust the position of each roll in a closed loop, adjusting each roll to the position required for the current tube type production. This achieves the goal of automatic and rapid roll adjustment according to different tube types.

[0046] To ensure the accuracy of the mechanical reduction gear for the roll adjustment torque, a high-speed ratio reducer is used. Combined with servo motors for speed regulation and positioning, this achieves a roll position detection accuracy of 0.001mm and guarantees accurate positioning at high speeds during adjustment. Furthermore, the use of absolute encoders with position memory function ensures that the control system can accurately detect the actual position of each roll as long as the electrical control system is powered on.

[0047] Previously, manual adjustment of rolls in the industry was achieved by operating buttons installed next to the gate. When adjusting rolls manually, it was inconvenient for operators to observe the effect of the adjustment. However, by using a handheld industrial wireless remote control or a mobile tablet to replace the buttons on the original button station, the parameters can be adjusted quickly and intuitively in real time online, making the operation more convenient.

[0048] Specifically, the roll structure of the roughing and finishing units includes a gate, an upper roll, a lower roll, and two side rolls. One side roll is connected to the upper roll, and the other side roll is connected to the lower roll. The upper roll and its connected side roll are raised and lowered as a whole, and moved laterally individually, controlled by a servo motor and a worm gear screw. The lower roll and its connected side roll maintain a constant height and are moved laterally individually, driven by a worm gear screw controlled by a servo motor. The upper roll is adjusted for height, the side rolls for left and right adjustment, and the lateral adjustment of both the upper and lower rolls is electrically operated (AC servo, with strip electric pressing function). During production of all specifications, only the relative positions of the individual rolls are adjusted; the rolls are universal. The upper and lower shafts are driven by AC variable frequency motors.

[0049] Specifically, after the square and rectangular tube production line is started, if the appearance dimensions or radius of the product to be produced change and exceed the product standard, affecting product quality, unlike the traditional method of stopping the machine to adjust the roller spacing, this specific embodiment allows the operator to input fine-tuning instructions and PLC based on the product appearance dimensions using a remote control without stopping the machine. The PLC adjusts the roller spacing of the corresponding stand, allowing for observation and adjustment simultaneously. This method has the advantages of being effective, saving adjustment time, and reducing product waste caused by multiple machine stops. On average, it can save 2 hours of adjustment time in daily production.

[0050] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A manufacturing system for rapid online adjustment of cold-formed steel, comprising a square and rectangular tube production line; the square and rectangular tube production line sequentially includes a steel coil uncoiling unit, a shearing and welding unit, a looper storage unit, a rough forming unit, a high-frequency welding unit, a sizing and precision forming unit, a length sawing unit, an automatic collection unit, and an automatic packaging unit; wherein, The steel coil uncoiling unit, shearing and welding unit, looper storage unit, fixed-length sawing unit, automatic collection unit, and automatic packaging unit are all integrated with corresponding control systems, characterized in that: It also includes a host computer and PLCs; multiple PLCs are configured to correspond one-to-one with the host computers of the rough forming unit, high-frequency welding unit, sizing and finishing unit, and square and rectangular tube production line; the host computer is used to receive external instructions and send them to the corresponding PLCs, and the PLCs are used to control the drive speed of the host computers of the rough forming unit, high-frequency welding unit, sizing and finishing unit, and square and rectangular tube production line according to the external instructions; the host computer is also used to control the corresponding control systems of the steel coil uncoiling unit, shearing and welding unit, loop storage unit, fixed-length sawing unit, automatic collection unit, and automatic packaging unit; It also includes a servo driver and a servo motor; the signal output terminal of the PLC is electrically connected to the signal input terminal of the servo driver, the signal output terminal of the servo driver is electrically connected to the signal input terminal of the servo motor, and the output terminal of the servo motor controls the position of the rolls in the rough forming unit and the sizing and finishing forming unit; the servo motor integrates an absolute encoder, which is used to record the actual position of the corresponding roll of the servo motor and feed it back to the PLC; The roll structure of the rough forming unit and the sizing and finishing unit includes a gate, an upper roll, a lower roll, and two side rolls; one side roll is connected to the upper roll, and the other side roll is connected to the lower roll; the upper roll and its connected side roll are controlled by a servo motor to move up and down as a whole and move laterally individually; the lower roll and its connected side roll have a constant height and are moved laterally individually by a servo motor to drive the worm gear screw. The host computer stores the roll parameters for each stand required for different types and specifications of products. Based on externally input instructions, the host computer determines the specifications of the product to be produced and sends corresponding parameter control instructions to the PLC. The PLC controls the servo drive according to the parameter control instructions, and the servo drive controls the servo motor. The absolute encoder of the servo motor records the number of revolutions; once the specified number of revolutions for the corresponding roll parameters is reached, it feeds back to the servo drive, which then stops the servo motor. The operator measures and confirms the roll spacing of each stand and inputs fine-tuning instructions using a tablet computer. The PLC controls the corresponding servo motor to perform fine-tuning based on these instructions. After the square and rectangular tube production line is started, when the appearance dimensions or radius of the product to be produced change, the operator can input fine-tuning instructions using a remote control based on the product appearance dimensions without stopping the machine; the PLC controls the corresponding servo motor to adjust the spacing of the rollers in the corresponding frame based on the fine-tuning instructions.

2. The manufacturing system for rapid online adjustment of cold-formed steel according to claim 1, characterized in that: It also includes a frequency converter. The signal output terminal of the PLC is electrically connected to the signal input terminal of the frequency converter, and the output terminal of the frequency converter is electrically connected to the motor and gearbox of the main unit of the square and rectangular tube production line. The PLC controls the motor and gearbox of the main unit of the square and rectangular tube production line through the frequency converter, thereby controlling the transmission speed of the main unit of the square and rectangular tube production line.

3. The manufacturing system for rapid online adjustment of cold-formed steel according to claim 2, characterized in that: The frequency converter integrates an encoder, which is used to record the rotational speed of the motor of the main machine of the square and rectangular tube production line and feed it back to the PLC.

4. The manufacturing system for rapid online adjustment of cold-formed steel according to claim 1, characterized in that: It also includes a computer touch screen, which communicates with the host computer; the computer touch screen is used to receive external control commands and send them to the host computer; each PLC is equipped with a tablet computer and a remote control, which communicate with the corresponding PLC and the host computer respectively; both the tablet computer and the remote control are used to receive external control commands and send them to the PLC.

5. The manufacturing system for rapid online adjustment of cold-formed steel according to claim 1, characterized in that: The host computer controls the corresponding control systems of the steel coil uncoiling unit, shearing and welding unit, loop storage unit, fixed-length sawing unit, automatic collection unit and automatic packaging unit through distributed I / O.

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