As a typical OEM industry, the textile machinery industry involves many technological processes, including many process sections. On the whole, most of the machinery is controlled by PLC, and a large number of transmission products are involved. From electrical control, it is divided into PLC, touch screen (HMI), low-voltage inverter, servo and low-voltage electrical appliances. In terms of technology, it is divided into different types of machinery such as cotton spinning machinery, weaving preparation machinery, weaving machinery, knitting machinery, dyeing and finishing machinery, chemical fiber machinery, and non-woven machinery. The cotton spinning machinery is divided into the process flow as shown in the figure below, and the roving frame as an important part of the spinning process plays a pivotal role.
Process flow of coarse sand machine:
Composition: feeding, drafting, twisting, winding
Process: The sliver is pulled out from the strip 12 -- guide roller 10 -- output roller 9 -- wing spindle stretching device 4 -- roving package 2 (as shown in the figure below)
Coarse sand machine drive shaft function:
Wing ingot stretching device (referred to as spindle wing): used for twisting
——The spindle wing rotates, and the palm pressing leaf is pressed to the surface of the bobbin under the centrifugal force of the palm rod and the roving tension, so that the roving is wound tightly.
——Change the number of wrapping circles of the roving on the bending arm of the pressure palm, and adjust the roving tension.
Roving package (referred to as copper tube): used for winding
Output roller (referred to as roller): used for cotton yarn drawing and elongation
Rise and fall of the lower dragon tendon (referred to as the dragon tendon): It is used for the upper and lower molding of the spindle.
Transmission control system:
As shown in the figure below, each of the four synchronous drive control systems is driven by its own electric motors. They are: spindle wing (U1), bobbin (U2), roller (U3), and lower dragon tendon lifting (U4).
The spindle wing motor is driven by an 8400 HighLine inverter, the spindle wing motor is installed with a speed encoder to form a closed loop on the speed, and the pulse signal on the encoder is distributed to the bobbin 8400TopLine servo controller as a speed-given instruction. Through the bobbin drive, the Axis bus terminal unique to the 8400TopLine servo controller transmits the speed signal collected by the driver from the encoder to the roller (U3) and dragon rib (U4) lifting servo controllers through the CANopen synchronous communication function, and completes the speed synchronization function of the division.
In the spinning process, the system requires the motors of the four divisions to run synchronously, so that the tension of the yarn remains stable, and according to the change of the winding diameter of the yarn, adjust the speed of each motor and the speed ratio relationship between each other, so that the whole transmission system action is coordinated, which requires that a set of data communication system suitable for data transmission between multiple motors must be established, and the action of each division is detected and controlled in real time, so as to complete the data exchange between the upper host and each motor, and between each motor, and the communication system requires high reliability, adaptability, scalability and simple connection.
System-related Lenze product introduction:
The control system of the four-motor division drive roving frame consists of a touch screen, PLC, 8400 HighLine inverter, 8400 TopLine servo controller and other auxiliary devices.
The 8400 HighLine frequency inverter and the 8400 TopLine servo controller are the drive components for the four-motor segment drive roving frame. Thanks to the high-precision angle transmission resolver installed at the end of the motor, the 8400 HighLine drives and TopLine servo controllers can use the resolver feedback elements to establish speed and position feedback, resulting in an accurate servo system between the 8400 and the motor. The servo controller has a rich library of function modules, which can flexibly configure control functions and input and output signals.
The PLC receives the data information of each 8400 drive on the touch screen and CANopen network, analyzes and processes it, and sends control instructions to each 8400 drive in accordance with the predetermined mathematical model and operation rules, so that the whole system can operate normally and coordinatedly. At the same time, the Axis bus port is used between U2, U3 and U4, and the bus type network topology is adopted, so that the three drivers form a second data communication network to transmit data. The CANopen synchronization method is used to establish a connection between the servo controllers for data transmission, which is a unique feature of Lenze's new servo controller. It converts the speed or phase signal of the higher-level servo controller into a CANopen digital signal, passes it to the Axis bus port of the next-level servo controller through the Axis bus port, and reconverts and normalizes it to a given value of speed or phase, which is processed as the driving and control signal of the servo motor of this stage after certain calculations. The signal transmission of the AXIS bus port is purely digital, with no bias and gain errors, and the transmission is very precise. The anti-interference ability is very strong, the reliability is high, and the transmission speed is fast. This mode is used to transmit data between servo controllers, and the synchronous control between each servo motor can be easily realized.
Key points of the solution technology:
1. Dual-bus structure: Axis bus and CANopen bus coexist, which can reduce the burden of CANopen, make the whole system configuration more flexible and more reliable
2. Power-off synchronous shutdown: that is, in the case of unexpected power-off of the equipment, the external provides a short-term 24-volt power supply, spindle wings, bobbins, rollers, and dragon tendon lifting motors are stopped synchronously, and after power-off and parking, the cotton yarn will not appear broken yarn and fine knots, and the spinning can continue after power-on
3. Electronic gear ratio setting of four motors: free variable parameters are provided inside the drive, which can be freely set by PLC and modified in time
4. The 8400HighLine inverter has comprehensive functions: the 8400HighLine inverter has a servo control mode, so that the speed fluctuation of the motor is small and the control accuracy is high during operation
Development Trends:
A large number of automation products are used in textile machinery, and automation products are divided into touch screens, PLCs, and a large number of transmission products, and transmission products are divided into low-voltage inverters and servos. Low-pressure inverters are used in almost all processes of textile machinery, including open-cleaners, carding machines, strip rolls, combers, drawing frames, roving frames, spinning frames and winders. For weaving machinery, there are sizing machines, warping machines, etc. In addition, low-voltage inverters are also widely used in knitting machines, non-woven fabrics, chemical fiber machinery, and printing and dyeing machinery. Servo products are mainly used for tension control in the textile industry, and are most widely used in combing machines, roving frames, spinning frames, drawing frames, twisting machines, shuttleless looms in looms and printing and dyeing equipment in textile machines. Combers, roving frames, draw frames, and twisting machines in textile machines have all begun to use servo products to control tension. In this case, not only did the new 8400 TopLine servo controller from Lenze be used, which took its place in the high-end models of textile machinery, but also the 8400 HighLine inverter, which laid a solid foundation for its wide range of applications in low-end equipment in the textile industry.
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