Application of the hottest electric control in the

  • Detail

Application of electrical control in the production line of electric tools

programmable controller (PLC) is a general industrial automation device with computer technology as the core. It combines the traditional relay control system with computer technology, and has the characteristics of high reliability, versatility, easy programming, convenient use, etc. therefore, in recent years, it has been widely used in industrial automatic control, electromechanical integration Transformation of traditional industries has been widely used. It is known as one of the three pillars of modern industrial production automation

in modern industrial production, especially in the process of automatic production, we need to use various sensors to! Monitor and control various parameters in the production process to make the equipment work in a normal or optimal state and make the products reach the best quality. Therefore, it can be said that without many excellent sensors, modern production will lose its foundation

if the programmable controller is the heart of automatic production and the sensor is the nerve, I. common fault status: if there is abnormal sound and vibration in the oil delivery pump, then pneumatic control is the right arm of automatic control. With the combination of electronic technology, the application of pneumatic technology has developed rapidly, especially in various automatic production lines. With the development of electrical programmable control system, the automation of the whole system is higher, the control mode is more flexible, and the performance is more reliable. Pneumatic technology has become one of the key technologies to realize modern transmission and control

the production line of electric tools is to make full use of PLC control technology, sensor control technology and electrical control technology to achieve the purpose of automatic production

1. Composition and working process of the wire body

the wire body is a part of the assembly line in the power tool industry and the carrier of the power tool production and assembly line. The assembly of the product is completed on the body. Pneumatic technology, sensor technology, PLC programmable control and other electrical automation control technologies are widely used in the line body, which makes its operation very humanized and automatic, thus ensuring the production efficiency of the food industry. It is mainly composed of the following parts:

(1) tooling tray: the carrier of semi-finished products. It is used for tooling fixtures to stabilize products and facilitate employees to carry out corresponding operations

(2) track: up and down channels of products. For ascending, horizontal track is adopted and pulley is equipped to facilitate the flow of tray between stations; Downward, adopt slope track equipped with pulley, and the tray can slide to the initial end by itself after the product is assembled

(3) box: built-in motor, relay, sensor, cylinder, PLC and other components. Its function is to turn the tray sharply between up and down. At the initial end, the downward pallet is transferred to the upward pallet to carry new products for assembly and processing; At the end, transfer the pallet of the products that have been assembled up to the down, and slide to the initial end through the slope track

the specific operation process and composition are shown in Figure 1

2. System electrical control design

(1) system description

(1.) Press x0 to complete the power on operation, and X20 turns off the power

(2.) Provide tray: when the tray is running on the downward track, after the detection of sensor I (x1), if there is no tray at sensor II (x2) and sensor III (x3) or the tray has been put into the elevator, that is, the wear products of sensor VI are taken away by lubricating oil (x6) is powered on, then the isolation cylinder 1 retracts (Y1 is powered on, t0 is reset after 1 second counting to isolate the second tray). Release the pallet to the next section

(3.) Overnight tray transportation: when the sensor II (x2) senses the tray and the lifting cylinder is at the lower limit, the isolation cylinder 2 shrinks (Y2 is powered on, T1 is reset after 1 second), the conveyor belt 1 rotates (Y13), and the tray is transported to the lifting platform. Otherwise, the isolation cylinder will prevent the tray from sliding further to avoid rushing out of the track

(4.) Tray in place: when sensor III (x3) detects the tray, conveyor 2 rotates forward (Y1 4) until sensor IV (x6) detects that the tray is completely in place

(5.) Pallet Rising: after sensor Ⅳ (x6) detects that the pallet is in place, the lifting cylinder rises (Y3) and sends the pallet up

(6.) Tray up and out: after the cylinder rises to the upper limit (x5), the conveyor belt 2 reverses (Y15) to send the tray up

(7.) Reset of the lifting cylinder: when the tray that sends the mountain touches the travel switch (X7), that is, the tray has left the lifting platform, the conveyor belt 2 stops, and the lifting cylinder drops (Y4)

(8.) Pallet line feed: when the pallet moves to the B end in the upward track, the sensor V (X12) detects that it is in place, and the line feed cylinder shrinks (Y5), the movable guide rail section can be docked with the downward track, and the pallet slides out automatically; At this time, T2 will automatically reset the movable guide rail after 3 seconds of timing; When the tray slides over sensor VI (x1 3), the line feed cylinder extends (y6) and connects with the uplink track

the electrical control diagram of the system is shown in Figure 2

(2) I/O address allocation

see Table 1 and table 2 for the specific input and output address comparison

(3) control process program design

based on the comparison between the above control requirements and the I/O address, the production line adopts Mitsubishi plc-fxln-20mr, and the state transition diagram of its control

is shown in Figure 3

before on-site commissioning, first carefully check the external wiring of PLC, which is a very important link. The external wiring must be accurate. You can use the test program written in advance to trace and power on the external wiring to find the wiring fault. For safety reasons, it is best to disconnect the main circuit. After confirming that the wiring is correct, connect the main circuit, and send the simulated debugging program to the user memory for debugging until the functions of each part are normal and the overall control function can be completed in a coordinated manner. After on-site debugging and operation, all sensors, pneumatic components and PLC can operate normally, and the purpose of automatic control can be achieved in the production line

3. Conclusion

this paper introduces the electrical control process of electric tool line production. This control process makes full use of PLC control technology, sensor control technology and electrical control technology, and uses FXlN series PLC to compile and debug the program. The debugging results show that the line production line can complete the operation of the workpiece according to the predetermined requirements, and transmit it to different positions according to the settings. The realization and application of this control system, It fully reflects the application of electrical control technology in industrial field. Changing data and conditions according to design requirements and different needs can also make its application more extensive

Copyright © 2011 JIN SHI