A control system for a single-sided open continuous bag making machine

Abstract

The present invention relates to a control system for a single-sided open continuous bag making machine, which includes a servo motor unit and an asynchronous motor unit. The servo motor unit and the asynchronous motor unit respectively perform a series of actions such as feeding, fixed-length control, material feeding, bag rubbing, and winding. The servo motor unit is driven by a number of corresponding servo drivers, and the asynchronous motor unit is driven by a number of frequency converters. It also includes a PLC controller, an AD / DA module, and a signal acquisition module that are interconnected. The PLC controller respectively sends pulse signals to the servo drivers to achieve precise fixed-length control of the servo motor unit. The PLC controller respectively receives the data signals collected by the signal acquisition module through the AD / DA module, performs signal processing operations in the PLC controller, and then outputs them to the corresponding frequency converters. After being amplified by the frequency converters, the corresponding asynchronous motors are driven to achieve precise closed-loop signal control. The PLC controller controls the host frequency converter at a set speed through a communication protocol to achieve automatic acceleration and deceleration actions of the host motor.

Description

Technical Field

[0001] The present invention relates to the field of packaging bags, and particularly to a control system for a single-sided opening continuous roll bag making machine. Background Art

[0002] Packaging products are involved in all aspects of daily life. Most of the products such as melon seeds, peanuts eaten usually, clothes bought, and items mailed at the post office are independently packaged in packaging bags. For example, in the currently popular online shopping, most clothes are packaged in plastic bags and then delivered by express for transportation. Some existing enterprises still use methods such as manual bag taking, filling, and sealing for the bagging operation of products. Such operation has low efficiency and high labor cost. Of course, some enterprises also use a conveying mechanism for packaging bags to convey the packaging bags, and then perform manual bagging and sealing operations. In the existing technology, it is often difficult to master the conveying speed of the packaging bags and the filling speed of the products, making it difficult to carry out the packaging work quickly. Moreover, the manual participation in each link wastes human resources and cannot achieve automatic operation. Therefore, a new type of continuous roll bag making machine is needed.

[0003] A continuous roll bag making machine is a machine for making various plastic packaging bags or packaging bags of other materials. Specifically, the production process of general continuous roll bags generally includes unwinding, bag making, bag rubbing, and winding. Among them, bag making is to use bag making equipment to seal the four sides of the bag by heat sealing the folded material. A continuous roll bag refers to a bag that is wound together after bag making. The continuous roll bag is small in volume, convenient for storage and use. When using bag making equipment to produce continuous roll bags, it is also necessary to cut off the positions where the packaging bags need to be opened to facilitate the separation of individual packaging bags in the future.

[0004] In the actual use process of the existing continuous roll bag making machine, when performing a series of actions such as unwinding, bag making, bag rubbing, and winding for continuous roll bags of different specifications, workers need to adjust the motors on each component of the single-sided opening continuous roll bag making machine according to the bag length or width of the continuous roll bag to adapt to the continuous roll bag of this specification. However, this method is too cumbersome to operate. There are many manual adjustment steps and it requires precise cooperation among various components and multiple debugging before it can be put into production. If one component is debugged incorrectly, it will lead to a decrease in the operating speed of the whole machine and an increase in the failure rate. Summary of the Invention

[0005] As a further improvement to the prior art, the present invention provides a control system for a single-sided open continuous bag making machine. The entire system adopts multi-axis synchronous control technology to achieve precise and automatic control of the continuous bag and various moving components. Four servo motors perform precise length feeding and bag mouth separation according to the set length, and two three-phase AC asynchronous motors achieve full closed-loop control according to the main machine speed and displacement signal position, realizing the fully automatic linkage operation of seven motors. It has the characteristics of stable operation, low failure rate, and adjustable linkage operation speed. Moreover, by outputting the specifications of the continuous bag to be processed through the PLC controller, the system can automatically modify the corresponding parameters for the seven motors, improving work efficiency and reducing manual debugging costs.

[0006] To achieve the above object, the present invention provides the following technical solution: A control system for a single-sided open continuous bag making machine, characterized in that: it includes a servo motor unit composed of multiple servo motors and an asynchronous motor unit composed of multiple asynchronous motors and a main machine motor. The servo motor unit and the asynchronous motor unit respectively perform a series of actions of feeding, length fixing, material feeding, bag rubbing, and winding; the servo motors in the servo motor unit are respectively driven by several corresponding servo drivers, and the asynchronous motor unit is respectively driven by several corresponding frequency converters and a main machine frequency converter corresponding to the main machine motor; it also includes a PLC controller, an AD / DA module, and a signal acquisition module connected to each other. The PLC controller respectively sends pulse signals to the servo drivers to achieve precise length control of the servo motor unit; the PLC controller receives the data signals collected by the signal acquisition module through the AD / DA module, performs signal processing operations in the PLC controller, and then outputs them to the corresponding frequency converters. After being amplified by the frequency converters, the corresponding asynchronous motors are driven to achieve precise closed-loop signal control; the PLC controller controls the main machine frequency converter at a set speed through a communication protocol to achieve automatic acceleration and deceleration actions of the main machine motor.

[0007] Further, the servo motor unit includes a front length fixing servo motor driven by a front length fixing servo driver, a rear length fixing servo motor driven by a rear length fixing servo driver, a bag rubbing lifting servo motor driven by a bag rubbing lifting servo driver, and a bag rubbing rubber roller servo motor driven by a bag rubbing rubber roller servo driver. The asynchronous motor unit includes a driving motor driven by a main machine frequency converter, a feeding motor driven by a feeding frequency converter, and a winding motor driven by a winding frequency converter. The signal acquisition module includes a feeding displacement sensor for detecting the position signal of the feeding rubber roller and a winding displacement sensor for detecting the position signal of the winding roller.

[0008] Further, the front fixed-length servo motor drives the front rubber roller to send the prefabricated bag film to the bag rubbing position; the rear fixed-length servo motor drives the rear rubber roller to send the prefabricated bag film to the heat sealing and tearing knife position; the bag rubbing lifting servo motor drives the lifting rubber roller to the bag rubbing rubber roller position; the bag rubbing servo motor drives the bag rubbing rubber roller; the feeding displacement sensor collects the feeding position signal and sends it to the AD / DA module; the winding displacement sensor collects the winding position signal and sends it to the AD / DA module; the feeding motor drives the feeding rubber roller to send the prefabricated bag film to the rear rubber roller position; the winding motor drives the winding roller to wind the prefabricated bag film to the winding roller position.

[0009] Further, the servo driver, the PLC controller and the AD / DA module are centrally arranged in an electric control cabinet to prevent the packaging machine from being accidentally touched during operation.

[0010] Further, it also includes a human-machine interface for displaying various set parameters and functions.

[0011] Further, the communication protocol is 485 communication.

[0012] Further, the PLC controller is a dedicated programmable controller of Zhongxin Electronics.

[0013] Further, the servo motors are all dedicated servo motors of Zhongxin Electronics.

[0014] Further, the servo drivers are all dedicated drivers of Zhongxin Electronics.

[0015] The beneficial effects of the present invention are as follows: The entire system adopts multi-axis synchronous control technology to achieve precise automatic control of the continuous roll bag and various moving components. Four servo motors perform precise fixed-length feeding and bag mouth separation according to the set length. Two three-phase AC asynchronous motors achieve full closed-loop control according to the host speed and displacement signal position, realizing the fully automatic linkage operation of seven motors. It has the characteristics of stable operation, low failure rate, and adjustable linkage of the operating speed. Moreover, by outputting the specifications of the continuous roll bag to be processed in the PLC controller, the system can automatically modify the corresponding parameters for the seven motors, improving work efficiency and reducing the manual debugging cost.

[0016] The present invention will be further described below with reference to the accompanying drawings. Description of the Drawings

[0017] Figure 1 It is a module schematic diagram of the control system according to an embodiment of the present invention.

[0018] Figure 2 It is a front view of the single-sided opening continuous roll bag making machine according to an embodiment of the present invention.

[0019] Figure 3It is the top view of the single-sided opening continuous roll bag making machine in the embodiment of the present invention. Detailed implementation manners

[0020] As Figures 1-3 shown, the entire system adopts multi-axis synchronous control technology to achieve precise automatic control of the continuous roll bag and each moving part. Four servo motors perform precise length feeding and bag mouth peeling according to the set length, and two three-phase AC asynchronous motors achieve full closed-loop control according to the main machine speed and displacement signal position, realizing the fully automatic linkage operation of seven motors. It has the characteristics of stable operation, low failure rate, and adjustable linkage operation speed. Moreover, by outputting the specifications of the continuous roll bag to be processed in the PLC controller, the system can automatically modify the corresponding parameters of the seven motors, improving work efficiency and reducing the manual debugging cost.

[0021] In this embodiment, the PLC controller is a dedicated programmable controller of Zhongxin Electronics. The IO ports of this PLC generally use 24V voltage, can work stably in the relatively complex electromagnetic environment of the industrial site, have strong anti-interference ability, and are highly integrated and standardized. The PLC has many functions built-in and supports mainstream communication protocols, enabling designers to spend more time on the realization of equipment functions. It has strong scalability. In addition to the CPU module, the PLC provides many types of expansion modules, and expansion can be completed simply by direct connection. It is convenient to assemble. The PLC is generally modular and installed on a standard guide rail. The wiring is through terminal blocks and does not require welding, fully meeting the programming requirements of the control system of the single-sided opening continuous roll bag making machine of the present invention.

[0022] In this embodiment, the servo motors are all dedicated servo motors of Zhongxin Electronics. This servo motor has achieved closed-loop control of position, speed, and torque; overcome the problem of step motor loss of step; has strong overload resistance and can withstand a load three times the rated torque, being very suitable for the winding motor and unwinding motor that need to be opened and closed frequently. The dynamic response time of the motor during acceleration and deceleration is short, generally within dozens of milliseconds, and the heat generation and noise are significantly reduced, very meeting the control requirements of this single-sided opening continuous roll bag making machine.

[0023] In this embodiment, the servo drivers are all dedicated drivers of Zhongxin Electronics. This driver is a combination of a servo motor and a driver, and both use a digital signal processor (DSP) as the control core, which can implement relatively complex control algorithms and achieve digitalization, networking, and intelligence.

[0024] A control system for a single-sided open continuous bag making machine, including a servo motor unit 1 composed of multiple servo motors and an asynchronous motor unit 2 composed of multiple asynchronous motors and a main motor 23. The servo motor unit 1 and the asynchronous motor unit 2 respectively perform a series of actions of feeding, fixed-length, feeding, bag rubbing, and winding; the servo motors in the servo motor unit 1 are respectively driven by a number of corresponding servo drivers, and the asynchronous motor unit 2 is respectively driven by a number of corresponding frequency converters and a main frequency converter 73 corresponding to the main motor 23; it also includes a PLC controller 3, an AD / DA module 4, and a signal acquisition module 5 that are interconnected. The PLC controller 3 respectively sends pulse signals to the servo drivers to achieve precise fixed-length control of the servo motor unit 1; the PLC controller 3 respectively receives the data signals collected by the signal acquisition module 5 through the AD / DA module 4 to the PLC controller 3 for signal processing and calculation, and then outputs them to the corresponding frequency converters. After being amplified by the frequency converters, the corresponding asynchronous motors are driven to achieve precise closed-loop signal control; the PLC controller 3 controls the main frequency converter 73 at a set speed through a communication protocol to achieve automatic acceleration and deceleration actions of the main motor 23. The servo motor unit 1 includes a front fixed-length servo motor 11 driven by a front fixed-length servo driver 61, a rear fixed-length servo motor 12 driven by a rear fixed-length servo driver 62, a bag rubbing lifting servo motor 13 driven by a bag rubbing lifting servo driver 63, and a bag rubbing rubber roller servo motor 14 driven by a bag rubbing rubber roller servo driver 64. The asynchronous motor unit 2 includes a main motor 23 driven by the main frequency converter 73, a feeding motor 21 driven by a feeding frequency converter 71, and a winding motor 22 driven by a winding frequency converter 72. The signal acquisition module 5 includes a feeding displacement sensor 51 for detecting the position signal of the feeding rubber roller 211 and a winding displacement sensor 52 for detecting the position signal of the winding roller 221. The front fixed-length servo motor 11 drives the front rubber roller 111 to send the prefabricated bag film to the bag rubbing place; the rear fixed-length servo motor 12 drives the rear rubber roller 121 to send the prefabricated bag film to the heat-sealing and tearing knife; the bag rubbing lifting servo motor 13 drives the lifting rubber roller (not shown in the figure) to the bag rubbing rubber roller (not shown in the figure); the bag rubbing servo motor 14 drives the bag rubbing rubber roller; the feeding displacement sensor 51 collects the feeding position signal and sends it to the AD / DA module 4; the winding displacement sensor 51 collects the winding position signal and sends it to the AD / DA module 4; the feeding motor 21 drives the feeding rubber roller 211 to send the prefabricated bag film to the rear rubber roller;The winding motor 22 drives the winding rod 221 to wind the prefabricated bag film to the winding rod. Since the working environment of the single-sided open continuous bag making machine is relatively complex and there is a certain risk of electric leakage, an effective improvement of the present invention is to centrally arrange the above servo driver, PLC controller 3 and AD / DA module 4 in an electric control cabinet for centralized management and control, which greatly avoids the electric leakage risk caused by the accidental touch of the electrical structure by the staff during production operations. In addition, a human-machine interface 8 (touch screen) is provided, which can display the motion states and motion curves of each servo motor and can be manually controlled to adjust the running speed or running accuracy in real time according to the production volume requirements.

Claims

1. A control system for a single-sided open continuous bag making machine, characterized in that: It includes a servo motor unit composed of multiple servo motors and an asynchronous motor unit composed of multiple asynchronous motors and a main motor. The servo motor unit and the asynchronous motor unit respectively perform a series of actions such as feeding, fixed-length control, material feeding, bag rubbing, and winding; the servo motors in the servo motor unit are respectively driven by several corresponding servo drivers, and the asynchronous motor unit is respectively driven by several corresponding frequency converters and a main frequency converter corresponding to the main motor; It also includes a PLC controller, an AD / DA module, and a signal acquisition module that are connected to each other. The PLC controller respectively sends pulse signals to the servo drivers to achieve precise fixed-length control of the servo motor unit; the PLC controller respectively receives the data signals collected by the signal acquisition module through the AD / DA module, performs signal processing operations in the PLC controller, and then outputs them to the corresponding frequency converters. After being amplified by the frequency converters, they drive the corresponding asynchronous motors to achieve precise closed-loop signal control; The PLC controller controls the main frequency converter at a set speed through a communication protocol to achieve automatic acceleration and deceleration actions of the main motor; Among them, the servo motor unit includes a front fixed-length servo motor driven by a front fixed-length servo driver, a rear fixed-length servo motor driven by a rear fixed-length servo driver, a bag-rubbing lifting servo motor driven by a bag-rubbing lifting servo driver, and a bag-rubbing rubber roller servo motor driven by a bag-rubbing rubber roller servo driver. The asynchronous motor unit includes a main motor driven by a main frequency converter, a feeding motor driven by a feeding frequency converter, and a winding motor driven by a winding frequency converter. The signal acquisition module includes a feeding displacement sensor for detecting the position signal of the feeding rubber roller and a winding displacement sensor for detecting the position signal of the winding roller; The front fixed-length servo motor drives the front rubber roller to send the prefabricated bag film to the bag-rubbing position; The rear fixed-length servo motor drives the rear rubber roller to send the prefabricated bag film to the heat-sealing and tear-opening knife; The bag-rubbing lifting servo motor drives the lifting rubber roller to the bag-rubbing rubber roller; The bag-rubbing rubber roller servo motor drives the bag-rubbing rubber roller; The feeding displacement sensor collects the feeding position signal and sends it to the AD / DA module; The winding displacement sensor collects the winding position signal and sends it to the AD / DA module; The feeding motor drives the feeding rubber roller to send the prefabricated bag film to the rear rubber roller; The winding motor drives the winding roller to wind the prefabricated bag film to the winding roller; The servo drivers, PLC controller, and AD / DA module are centrally arranged in an electric control cabinet to prevent the packaging machine from being accidentally touched during operation; The communication protocol is 485 communication.

2. The control system for a single-sided open continuous bag making machine according to claim 1, characterized in that: The PLC controller is a dedicated programmable controller of Zhongxin Electronics.

3. The control system for a single-sided open continuous bag making machine according to claim 1, characterized in that: The servo motors are all dedicated servo motors of Zhongxin Electronics.

4. The control system for a single-sided open continuous bag making machine according to claim 1, characterized in that: The servo drivers are all dedicated drivers of Zhongxin Electronics.

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