Weft knitting piezoelectric needle selector drive circuit board

Abstract

The invention relates to the technical field of textile technologies and discloses a driving circuit board of a weft-knitting piezoelectric needle selector. The driving circuit board comprises a horn-shaped patch plug, a power supply management module, a CAN bus communication module, an embedded type MCU, a hard addressing module, a photoelectric isolation module, a serial-in parallel-out module and a piezoelectric selection piece drive output interface which are arranged on a circuit board, wherein the embedded type MCU is separately connected with the CAN bus communication module, the hard addressing module, the power supply management module and the photoelectric isolation module, the photoelectric isolation module is connected with the serial-in parallel-out module, the serial-in parallel-out module is connected with the power supply management module and the piezoelectric selection piece drive output interface, the horn-shaped patch plug is arranged at one end of the circuit board and is connected with the CAN bus communication module, and the piezoelectric selection piece drive output interface is located at the other end of the circuit board. The circuit board disclosed by the invention is high in integration level and simple in structure.

Description

technical field [0001] The invention relates to the technical field of textiles, in particular to a driving circuit board of a piezoelectric needle selector for weft knitting. Background technique [0002] In recent years, due to the rapid development of the weft knitting industry, it is urgent to use advanced automatic circular weft knitting equipment to improve the production efficiency of the industry. At present, the circular weft knitting machine with piezoelectric needle selector is an important automatic circular weft knitting machine. equipment. [0003] The piezoelectric needle selector for weft knitting is one of the core actuators in the control system of circular knitting machines. It uses the inverse piezoelectric effect of piezoelectric ceramics to convert electrical energy into mechanical energy. The driving circuit board of the weft knitting piezoelectric needle selector can provide a series input and output DC high-voltage signal to drive and control the le...

AI Technical Summary

Problems solved by technology

[0004] At present, a mainstream large-scale circular weft machine needs 144 pieces of piezoelectric needle selectors, that is, it is necessary to control the offset movement of the needle selection head driven by 2304 piezoelectric needle selectors at the same time, and control the circuit of the piezoelectric needle selector There are also up to 144 boards, and the system is often complex and huge, and it is not possible to output control signals in parallel

[0005] The traditional piezoelectric needle selector for weft knitting is an electromagnetic needle selector. Most of the drive circuit boards use high-voltage optocouplers to form a piezoelectric needle selector with a push-pull output circuit. Electromagnetic needle selectors are affected by low output frequency and electromagnetic coils. Restricted by factors such as high heat generation, it can only be used for circular knitting machines with low machine speed, and the limitations become more and more obvious as the machine speed increases.

When the drive board using high-voltage optocoupler to form a push-pull output circuit drives the piezoelectric needle selector, due to the volume of the high-voltage optocoupler and the increase of the output frequency of the system, the current becomes larger, causing a large heat generation, and the drive circuit board It is usually made into an oversized size for heat dissipation. The disadvantages are: 1. It takes up a lot of space in the weft knitting piezoelectric needle selector.

2. The overall power consumption is very large

3. The service life is short. Due to the high heat generation, the maximum temperature of the piezoelectric needle selector can reach about 70°C. The components are easy to be damaged when working in a high temperature environment, which affects the reliability of the whole machine.

4. The swing frequency of the piezoelectric needle selector driven by this kind of drive board can only reach 100HZ at most, which cannot meet the speed requirements of high-speed seamless circular weft machines.

5. It is difficult to guarantee the consistency and reliability of the high-voltage drive output circuit built by a large number of discrete optocoupler components, and the price is high

6. The output interface of the drive circuit generally adopts the direct connection method of three wires per piezoelectric needle selector. The production and assembly process is complicated, and the wiring inside the housing is messy and messy, which is not convenient for installation and later maintenance.

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