To modify the radial drilling machine control system based on PLC

Modification xiu-min sun of radial drilling machine based on PLC control system, welcome to visit e hall hall 6 boring/drilling radial drilling machine, drilling and milling machine, boring machine, boring and milling machine, drilling and tapping center,. 。 。 Radial drilling machine is suitable for single piece or mass production with large porous parts machining, is the general common machine tool machining workshop. Due to its original control system USES the relay - — Contactor control mode, complex circuit connection, contact more. After long-term use of connection in every region of the aging, cause high failure rate, troubleshooting is difficult, often affect the normal production of the enterprise. Because the PLC has high reliability, strong adaptability to environment, easy to use, simple maintenance, etc. Therefore, the use of PLC controller relay control circuit of radial drilling machine, to improve equipment reliability and utilization. 1 Z3040X16 model of radial drilling machine electric control ( 1) Using 3 motor to drag, main motor M1 ( 4. 0KW) , radial clamp motor ( 2. 2KW) , up and down rocker motor ( 2. 2KW) , 3 motors are small power motor, adopt direct start control. （ 2) Is equipped with the main motor start/stop control circuit, the control did not enter the PLC, directly used to control the start and stop button, because this circuit no chain control, don't need into the PLC to control, saves the I/O points, and reduced the troubleshooting. （ 3) Rocker arm up/down action in accordance with the 'rocker arm loose - Up/down - Radial clamping 'order by radial loosen travel switch for SQ2 and SQ3 clamping travel switch to control. In front of the radial clamping, by the time relay KT1 delay again after 1 ~ 3 s clamping. （ 4) Pillar and the relaxation of the spindle box, clamping can separate operation, also can undertake, at the same time by switch SA, loosen the button SB5 SB6 and clamping button control. Use of time relay KT2 power delay disconnect contact, KT3 electricity delay make contact, realize the electromagnet YA1, YA2 relative to the hydraulic pump motor contactor in advance, delay disconnect control. （ 5) Main motor M1 and M3 hydraulic pump motor is equipped with thermal relay FR1, FR2 long-term overload protection. PLC controller selection 2. 1 determine the I/O points in transforming the reserve system, the control function of the original as possible in order to achieve the best job in the radial drill effect, exert its maximum working efficiency, based on the original control circuit to calculate the I/O points. Among them: 6 (button Consider to save points, there are two not into the PLC controller) Four, travel switch, namely the actual input points for 8; Contactor (5 Consider saving points, there is a not into the PLC) 1, intermediate relay, the actual output points to 5. 2. 2 choose PLC models according to determine the I/O points, choose German Siemens company's S7 - 200 series of products. The PLC model for CPU222 - — 6ES7 212- 1 bb23 - Points for 8 0 xb0, input, output points for six, relay output, using the power of 85 to 264 vac ( 47-63 hz) 。 3 I/O address allocation and the wiring diagram of I/O allocation table shown in table a. Watch an I/O allocation according to the table a design I/O wiring diagram, as shown in figure 1. The contactor and intermediate relay voltage grade are adjusted, have replaced the new electrical components, voltage grade are AC220V, voltage grade and unified, easy to maintenance. Figure 1 I/O wiring diagram 4 PLC program design based on the original relay control circuit, analyzes the improvement, but still keep the original control function, ladder diagram, as shown in figure 2. Figure 2 ladder diagram 5 reform must pay attention to several problems ( 1) To consider when choosing a PLC type low price, high performance. （ 2) The original relay control circuit is more complex, such as the line after aging, fault point is too much, inconvenience query, and the use of PLC control, not only greatly improve the radial drilling machine electric control system reliability and anti-interference ability, but also greatly simplified and reduces the maintenance workload, use effect is good. 6 the conclusion for the radial drilling machine based on PLC control system after modification, greatly simplifies the control circuit, maintenance is very convenient, and reduces the failure rate of the equipment operation, greatly improve the stability of equipment operation and usage. Our electrical maintenance personnel tasted the sweets, don't mention before repair radial drilling machine, is a head of water, do not know how to start, since the transformation completed, have never encountered such a problem, radial drilling machine hasn't been affected production, stagnant. Suggest radial drilling machine manufacturers, also should change the usual design train of thought, to avoid similar problems in the process of production in the future.
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