The increasing scarcity of forest resources has made the comprehensive and efficient utilization of wood resources an important issue facing the woodworking equipment manufacturing and wood processing industries. Shenzhen Dongli Kechuang Technology Co., Ltd. has independently developed a touch integrated solution for rotary cutting machines based on the CT210 series rotary cutting machine dedicated frequency converter. This solution has received unanimous praise in the application field of medium-sized wood rotary cutting machines due to its excellent vector frequency conversion control performance, unique rotary cutting machine dedicated control algorithm, precise tail tension control, and excellent emergency start stop control.
Keywords: CT210 touch integrated rotary cutting machine
Introduction
At present, multi-layer board manufacturers mainly adopt a control scheme of text and frequency converter in the single board production process. The control part of this control scheme is in the text, which calculates the frequency of the frequency converter's rotary cutting through the position of the cutting table and then writes the frequency to the frequency converter through communication to achieve the purpose of controlling the rotary cutting. This plan has the following drawbacks:
1) Rough control interface: Compared to touch screen operation, the control text interface has poor human-computer interaction and the screen is not aesthetically pleasing.
2) Separate control and drive: The frequency of the frequency converter is given through text communication, and the communication signal is susceptible to interference. In strong interference environments, the tail tension control is not good or even cannot operate normally.
Using a touch screen integrated control solution, the control interface is beautiful and atmospheric, with good human-computer interaction. The rotary cutting control part is located in the frequency converter, and the touch screen only displays. Even if communication is interfered with, it will not affect normal operation, and the system stability is better.
This article will focus on the application of the rotary cutting touch integrated solution based on "touch screen+CT210 rotary cutting machine dedicated frequency converter+CT110 cutting blade frequency converter" on the cardless rotary cutting machine.
Characteristics of rotary cutting machine
The CT210 rotary cutting machine dedicated frequency converter is a specialized product developed on the CT200 frequency converter product platform. The frequency converter integrates the dedicated control logic of the rotary cutting machine into the frequency converter, and has integrated control of rotary cutting, breaking, and shaft pounding. Used for rotary cutting of wood, it has the advantages of uniform and precise rotary cutting thickness, precise tail tension control, etc., fully meeting customer needs. It can enable customers to switch seamlessly. Compared with similar competing products, it has the following product functional advantages:
Unique thickness compensation for better results;
Scheduled shutdown for more flexible business operations;
Integrated control of rotary cutting, fixed length cutting, and shaft pounding;
□ Integrated touch control solution.
Taking the on-site requirements of the rotary cutting machine produced by a certain manufacturer in Shandong as an example, the specific requirements are as follows:
Excellent human-computer interaction, beautiful and clear human-computer interface, accurate and reliable password protection;
Good speed control accuracy, excellent low-frequency output, and even thickness of super large wood rotary cutting can be ensured;
Good weak magnetic control, perfectly suitable for high-speed rotary cutting;
Excellent braking performance, emergency stop and start in 0.2 seconds, fast and stable switching between forward and reverse rotation;
Good overload capacity and environmental adaptability, high operational reliability;
The thickness error of rotary cutting is ± 0.01mm, and the length error of tail tension rotary cutting is ± 15mm;
Accurate statistics on the number of rotary cutting roots and veneer sheets;
Support switching between joystick and human-machine interface for better reliability;
Press the start switch, the frequency converter starts working, and the roller motor starts first (controlled by the output relay of the frequency converter to control the roller motor contactor)
After the start of the roller motor, the screw motor starts after a delay time. If the fast forward switch is pressed, the feed speed will be increased. Otherwise, the feed speed will be calculated based on the actual diameter of the round wood (the displacement of the cutting table is obtained through the input of the screw motor encoder, the actual diameter of the round wood is calculated, and the feed speed of the screw motor is obtained based on the mathematical model). When the rotary cutting blade touches the front stroke switch (circular reset switch), the roller motor immediately stops, and the screw motor will retreat at the set fast retreat speed to the retreat cut-off position (set the mouth position) or retreat to switch the feed displacement, and then feed again, in a cycle. During the retraction process, when the stop time of the pressure roller motor is greater than the restart time of the pressure roller motor, the pressure roller motor will restart
The series of high-performance vector frequency converters have been successfully applied in medium-sized wood rotary cutting machines, providing a more cost-effective frequency converter. It not only effectively solves the problem of tail tensioning, but also provides a more optimized human-machine interface and more convenient debugging methods. While improving the utilization rate of wood, it greatly facilitates user use.