PLC application in the woodworking band saw

PLC application in the woodworking band saw your vibration party Han Yakun Lv Weiyang welcome to e exhibition hall 2 woodworking machinery/furniture exhibition hall woodworking engraving machine, woodworking milling machine, carpenter ornamental engraving and milling machine, rotary cutting machine, woodworking drill/drilling holes,. 。 。 In woodworking machinery, woodworking band saw, for example, often through the PLC and single-chip microcomputer to control the feeding part automatically. Because of the control system of anti-jamming ability is poor, prone to error action and false data, make the operation personnel wrong, and wrong operation. And PLC have good anti-interference and generality, so as to solve the problem. 1, the working principle of the woodworking band saw machine is used to woodworking machine of sawing logs or timber into woodworking band saw machine, woodworking circular saw machine and wood frame sawing machine, etc. The woodworking band saw machine is circular band saw blade tension on two saw wheel, ring band saw blade by the motor through saw wheel drive, as a continuous cutting movement. The feed of wood can use manual, also a sports car or roller can be used to automatically feed. According to use classification, band sawing machine band sawing machine and can be divided into sawing logs sports car subdivision plate or timber cutting band saw again. The band sawing machine for this project use band saw. Sports car, refers to the clamping log to feed movement of the band saw blade to send material. Action of PLC needs to be done is to positioning control sports car. Sports car motor power equipment is assembled on top of the chassis, after gear transmission, drive the sports car reciprocating motion of spindle. Sports car forward for work trip, sports car back for the return trip. Its working process is, first of all sports car bench at a certain speed running a certain distance, when the system is to receive advance directives, and running the same distance, at the same speed and the distance can be modified. When the system received back instruction, carries on the return trip, until the order is cancelled. Forward and inversion of control sports car bench of forward and backward. Through the PLC control system to realize control of the direction of the motor. 2, the selection of the PLC and I/O point distribution in order to ensure the accuracy of the system control, band sawing machine control system adopts the closed loop control. According to the rotary encoder feedback pulse signal calculate the actual distance sports car workbench. After the car bench to set distance, PLC output brake signal, stop the operation of the sports car, sports car positioning. PLC control system need to configure the number 1 high speed pulse signal input. Sports car bench also need more than one designated location for penetration and the calculation of feet, can be installed in cars on proximity switch is used to determine the car after the designated position, so the system also need to configure a proximity switch input point. Finally, the system also need to configure the start, stop, into the car, car, inching button, etc. Therefore, the system of switch quantity input point for eight. System of brake contactor switch output point only 2 points, such as relays and back respectively control the car stop and direction of motion of the car. I/O points of PLC control system for distribution as shown in table 1. Table 1 I/O points of PLC control system of distribution to sum up, according to the requirement of the input and output, we choose HOLLiAS - hollysys company with independent intellectual property rights LEC PLC G3 small integration. Considering the system requires some spare I/O points, CPU module choice LM3107 with 24 point switch, the switch input and 14 points, switch output at 10 O 'clock. CPU module LM3107 bring 3 independent high-speed pulse input, the relay output current capacity of up to 2 a, can directly control the brake contactor, don't need intermediate relay. These configurations can completely meet the requirements of the system. 3, PLC control system software design sports car workbench running start, stop, switch SB1, SB2 IX0 received input from the PLC port % respectively. 1 and % IX0. 2. When the start switch SB1, workbench is up and running. When stop switch closed SB2, sports car stop running workbench. Produced by the rotary encoder pulse signal received internal counter HD_CTUD_T4 % IX0 input port. 4 and % IX0. 5. Counter HD_CTUD_T4 pulse counting function, based on PLC control system can locate roadster workbench current running distance, to set the current distance and distance are compared, to control the feeding position of the workbench. % QX0 PLC output port. 0 to brake contactor, used to control the operation of sports car workbench and stop. When % QX0. Forward, 0 = 0, motor drive the workbench. When % QX0. Inversion of the 0 = 1, motor, drive the workbench. According to the requirements of sports car bench operation process, the flow chart of the control system is shown in figure 1. PLC according to the current pulse HD_CTUD_T4 value and the value comparison of touch screen. If the current value is less than the set value, the workbench to continue running. If the current value is greater than the set value, the system output brake signals immediately, and then wait for the next forward signal input. When the system need to saw compensation, the program will be according to the user to select the amount of compensation for compensation. Figure 1 flow chart of the control system of 4, the conclusion with the PLC controller as the core of the woodworking band saw machine, realizing the closed-loop control position. High-speed count function based on PLC, and realized the positioning control of the car running workbench. PLC control system of strong anti-jamming capability, improve the machining precision of the woodworking band saw. Therefore, PLC control system can be widely used in furniture, doors and Windows and wood pattern and other manufacturing industries.
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