CN102926118A - Automatic bottom starting control system for flat knitting machine - Google Patents

Abstract

The invention relates to an automatic bottom-starting control system for a flat knitting machine, which is characterized in that it includes a core control circuit module, a scissors clip control circuit module and a bottom-starting control circuit module both communicated with the core control circuit module. The present invention has outstanding substantive features and significant progress: the automatic bottoming control system realizes the automatic knitting function of the flat knitting machine, which can not only reduce the waste of yarn during the knitting process of the computerized flat knitting machine at the beginning of the fabric, but also make the fabric target tight. The degree of weaving can be precisely controlled throughout the weaving process, thereby reducing waste yarn at the beginning, improving the degree of production automation and fabric quality, and can increase the speed of starting the empty machine and reduce the labor intensity of workers. In order to be suitable for large-scale flat knitting machines, the automatic bottom-starting control system can also form a communication connection with the main control board on the flat knitting machine through the CAN bus.

Description

Automatic Bottom Control System of Flat Knitting Machine

technical field

The invention relates to an automatic bottoming control system for a flat knitting machine.

Background technique

The starting control system of the flat knitting machine is an important part of the control system of the flat knitting machine, and its main function is to complete the fabric starting weaving process. The control method of the existing flat knitting machine control system is simple mechanical control rather than automatic control. Therefore, there are shortcomings that the speed of the stepping motor and the AC motor cannot be adjusted or can not be accurately controlled according to the position signal, and it is caused by inertia. The time difference of at least 20 microseconds leads to the waste of yarn in the initial weaving stage, the inconsistent tightness of the fabric during the weaving process, and ultimately affects the quality of the fabric.

Contents of the invention

The purpose of the present invention is to provide an automatic bottom-starting control system for flat knitting machines, which precisely controls the scissors clip control circuit module and the bottom-starting control circuit module through the core control circuit module, so as to meet the requirements of yarn clamping and cutting when knitting, and knitting at the beginning. Accurate positioning of the bottom plate, automatic control requirements such as compound needle holding yarn pulling, etc., realize the automatic knitting function of the flat knitting machine, and then accurately control the target fabric tightness during the whole knitting process, thereby reducing yarn waste at the beginning, improving the degree of production automation and Fabric quality.

The technical solution adopted by the present invention to solve the problems of the prior art is: the automatic bottom-starting control system of the flat knitting machine, which is characterized in that it includes a core control circuit module, a scissors clip control circuit module and a bottom-starting control circuit module. The core control circuit module controls the scissor clip control circuit module and the bottom control circuit module, so that the scissor clip control circuit module and the bottom control circuit module can accurately and efficiently control each actuator on the flat knitting machine, and timely feedback the information of each actuator to the core The control circuit module performs processing. Compared with ordinary flat knitting machines, the computerized flat knitting machine with automatic bottom control system can not only reduce the waste of yarn when the computerized flat knitting machine starts weaving the fabric, but also improve the consistency of fabric tightness during the weaving process. It can increase the starting speed of the empty machine, reduce the labor intensity of workers, achieve the purpose of economical operation and meet the market demand. Therefore, as the starting control system becomes more and more mature, the proportion of flat knitting machines equipped with automatic starting control system will increase in the knitting industry and make greater contributions to society.

As a further improvement and supplement to the above technical solution, the present invention adopts the following technical measures: the core control circuit module includes a CPU circuit, a bus interface circuit connected to the CPU circuit, a JTAG debugging interface circuit, a loading mode selection circuit, and a status indicator circuit. The bus interface circuit is used to form a network connection with CAN. Through the CAN bus, it can form a communication connection with the main control board on the flat knitting machine. It is suitable for large flat knitting machines. After forming a communication connection with the main control board, the flat knitting machine has a larger overall control system.

The scissors clip control circuit module includes a stepper motor drive circuit controlled by the core control circuit module, and a motor zero position signal detection circuit that sends position signals to the core control circuit module;

The bottom control circuit module includes an AC torque motor drive circuit controlled by the core control circuit module, which sends the AC voltage cycle to the AC voltage signal detection circuit of the core control circuit module, and sends the zero position information of the bottom plate to the core control circuit module. The bottom plate position detection circuit, and the limit signal detection circuit on the core control circuit module that sends the signal of detecting the limit position.

The stepper motor drive circuit, the motor zero position signal detection circuit, the AC torque motor drive circuit, the AC voltage signal detection circuit, the bottom plate position detection circuit and the limit signal detection circuit respectively communicate with the core control circuit through an optocoupler module connection.

Further, the stepping motor drive circuit, the motor zero position signal detection circuit, the AC torque motor drive circuit, the AC voltage signal detection circuit, the bottom plate position detection circuit and the limit signal detection circuit are respectively connected to the The CPU circuit is connected.

The motor zero position signal detection circuit detects the zero position signal through the switch value sensor. The scissors clip control circuit module completes the action control of the scissors mechanism and the action control of the clip mechanism. The scissors mechanism and the clip mechanism are respectively driven by stepping motors to perform actions.

The limit signal detection circuit feeds back a limit position signal through a switch sensor, the AC voltage signal detection circuit feeds back an AC voltage cycle signal through a transformer, and the bottom plate position detection circuit feeds back plate position information through an encoder. The bottom lifting control circuit module completes the compound needle action control and the bottom lifting plate action control. The opening and closing action of the compound needle and the rising and falling action of the bottom lifting plate are respectively driven by the AC torque motor, and the switching sensor feeds back the limit position signal of the bottom plate and the compound needle to the limit The signal detection circuit, the transformer feeds back the AC voltage periodic signal to the AC voltage signal detection circuit, and the encoder feeds back the position information of the lifter base to the position detection circuit of the lifter base.

The AC torque motor driving circuit includes a driving circuit and a braking circuit, the driving circuit adopts a solid state relay, and the braking circuit adopts a magnetic powder brake.

The present invention has outstanding substantive features and significant progress: the automatic bottoming control system realizes the automatic knitting function of the flat knitting machine, which can not only reduce the waste of yarn in the knitting process of the computerized flat knitting machine at the beginning of the fabric, but also make the fabric target tight. The degree of weaving can be precisely controlled throughout the weaving process, thereby reducing waste yarn at the beginning, improving the degree of production automation and fabric quality, and can increase the speed of starting the empty machine and reduce the labor intensity of workers. In order to be suitable for large-scale flat knitting machines, the automatic bottom-starting control system can also form a communication connection with the main control board on the flat knitting machine through the CAN bus.

Description of drawings

Fig. 1 is a system framework diagram of the present invention.

Fig. 2 is a structural diagram of the core control circuit module in the present invention.

Fig. 3 is a structure diagram of the scissors clip control circuit module in the present invention.

Fig. 4 is a structural diagram of the bottom control circuit module in the present invention.

Fig. 5 is a flowchart of the working principle of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Embodiment: The automatic bottom-starting control system of a flat knitting machine, as shown in Figure 1, includes a core control circuit module, a scissors clip control circuit module and a bottom-starting control circuit module that are both communicatively connected to the core control circuit module. When it is suitable for large-scale flat knitting machines, it is enough to form a communication connection with the main control board on the flat knitting machine through the CAN bus.

As shown in FIG. 2 , the core control circuit module includes a CPU circuit, a bus interface circuit for communication connection with the CPU circuit, a JTAG debugging interface circuit, a loading mode selection circuit, and a status indication circuit. The CPU uses ARM (STM32F103) as the core controller. The CPU circuit mainly includes a clock circuit, reset circuit and voltage input circuit to realize the normal operation of the CPU; the bus interface circuit mainly realizes the communication between the bottom control board and the main control board of the flat knitting machine; the JTAG interface circuit is mainly for downloading programs and debugging; the loading mode Select Primary to select the boot mode after reset.

As shown in Figure 3, the scissors clip control circuit module includes a stepper motor drive circuit controlled by the core control circuit module, and a motor zero position signal detection circuit that sends position signals to the core control circuit module. The scissors and clips control circuit module completes the action control of the scissors mechanism and the clips mechanism on the flat knitting machine. The scissors mechanism and the clips mechanism are respectively driven by stepping motors to perform actions. detection circuit. The control signals of the stepper motor are mainly motor enable, direction control, subdivision selection control and speed control.

Specifically, the stepper motor driving circuit and the motor zero position signal detection circuit are respectively connected to the core control circuit module through the optocoupler, so that the above-mentioned control signal communicates with the corresponding pin of the driver chip of the CPU module through the optocoupler.

As shown in Figure 4, the lifting control circuit module includes an AC torque motor drive circuit controlled by the core control circuit module, which sends the AC voltage cycle to the AC voltage signal detection circuit of the core control circuit module, and sends the zero position information of the bottom plate to the core control The position detection circuit of the bottom board of the circuit module, and the limit signal detection circuit on the core control circuit module that sends the signal of the detected limit position. The kick control circuit module completes the action control of the compound needle and the kick plate on the flat knitting machine. The opening and closing action of the compound needle and the rising and falling action of the lifting plate are respectively driven and executed by the AC torque motor, and the limit position signals of the lifting plate, the compound needle and the opening and closing roller are respectively fed back by the switch sensor to the limit signal detection circuit, and the AC voltage cycle signal is fed back by the transformer to the AC voltage signal detection circuit, and the encoder feeds back the bottom plate position information to the bottom plate position detection circuit.

This design can reduce the noise of the system, improve the reliability of the system, and make the system have the characteristics of high precision and high response speed. The sensor signal mainly includes the position signal of the lifting plate and the compound needle, the opening and closing state of the roller and other signals. Various control signals and sensor detection signals are designed with optocoupler isolation to improve the anti-interference ability of the system.

Specifically, the AC torque motor drive circuit, the AC voltage signal detection circuit, the bottom plate position detection circuit and the limit signal detection circuit are respectively connected to the core control circuit module through the optocoupler, so that the above-mentioned control signal is connected to the CPU module through the optocoupler. The corresponding pins of the driver chip communicate.

In practical application, the driving circuit module of the AC torque motor is mainly a driving circuit and a braking circuit, the driving circuit adopts a solid state relay, and the braking circuit adopts a magnetic powder brake.

The main program design of the automatic lifting control system of the flat knitting machine includes: the design of the control driver of the lifting plate and the compound needle; the design of the control driving program of the scissors mechanism and the clip mechanism; Signal detection program design.

As shown in Figure 5, the working principle and process of the automatic bottom-starting control system of the flat knitting machine: at the beginning, the main control board first sends CAN commands to the bottom-starting control board, and the CPU in the bottom-starting control board parses the CAN commands. The CAN command mainly includes preparation for bottom knitting, bottom knitting, action of scissor mechanism and clip mechanism and signal feedback. Then execute corresponding actions according to each action command of CAN. When the CAN command prepares for bottom knitting, it mainly detects whether the roller is open first, and then executes the actions of the bottom plate and compound needle. When the CAN command is bottom knitting, it is mainly the pulling control of the bottom board, including the control of the AC torque motor and the signal feedback of the encoder detection module. Among them, the control of the AC torque motor and the signal detection of the switch sensor are completed by the CPU. When the CAN command is the action of the clip mechanism of the scissors mechanism, it mainly controls the yarn clamping of the clip mechanism and the yarn breaking of the scissors mechanism. It is controlled and executed by the CPU and driven by a stepping motor. When the CAN command is signal feedback, it mainly communicates through the CAN bus, and feeds back the opening and closing state of the roller, the position information state of the composite needle and the position signal of the scissors clip to the main control board through the switch sensor, and the position signal of the lifting plate through the encoder. The position signal is fed back to the main control board.

Claims (8)

1. The automatic bottoming control system of the flat knitting machine is characterized in that it includes a core control circuit module, a scissors clip control circuit module and a bottoming control circuit module that are both communicatively connected to the core control circuit module. 2. The automatic bottoming control system of a flat knitting machine according to claim 1, wherein said core control circuit module comprises a CPU circuit, a bus interface circuit connected to the CPU circuit, a JTAG debugging interface circuit, and a loading mode selection circuit , Status indication circuit. 3. The automatic bottoming control system of flat knitting machine according to claim 2, characterized in that the scissors clip control circuit module includes a stepper motor drive circuit controlled by the core control circuit module, and sends position signals to the core control circuit The motor zero position signal detection circuit of the module; The bottom control circuit module includes an AC torque motor drive circuit controlled by the core control circuit module, which sends the AC voltage cycle to the AC voltage signal detection circuit of the core control circuit module, and sends the zero position information of the bottom plate to the core control circuit module. The bottom plate position detection circuit, and the limit signal detection circuit on the core control circuit module that sends the signal of detecting the limit position. 4. The automatic bottoming control system of flat knitting machine according to claim 3, characterized in that said stepping motor drive circuit, motor zero position signal detection circuit, AC torque motor drive circuit, AC voltage signal detection circuit, starting The bottom plate position detection circuit and the limit signal detection circuit are respectively connected to the core control circuit module through an optocoupler. 5. The automatic bottoming control system of flat knitting machine according to claim 4, characterized in that said stepping motor drive circuit, motor zero position signal detection circuit, AC torque motor drive circuit, AC voltage signal detection circuit, starting The bottom plate position detection circuit and the limit signal detection circuit are respectively connected to the CPU circuit through an optocoupler. 6. The automatic bottoming control system of flat knitting machine according to claim 3, characterized in that said motor zero position signal detection circuit and limit signal detection circuit respectively detect and feedback zero position signal and limit position signal through switching sensor . 7. The automatic bottom lifting control system of the flat knitting machine according to claim 3, characterized in that the AC voltage signal detection circuit feeds back the alternating voltage periodic signal through the transformer, and the bottom lifting plate position detection circuit feeds back the bottom lifting plate through the encoder location information. 8. The automatic bottoming control system of flat knitting machine according to claim 3, characterized in that said AC torque motor driving circuit comprises a driving circuit and a braking circuit, said driving circuit adopts a solid state relay, and said system The moving circuit adopts magnetic powder brake.

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