Anti-interference measures for power supply cabinet of CNC EDM machine Liu Xuhong Dong Liang Pan Xianfeng Chen Zhiliang. College of Engineering and Technology, Hunan Agricultural University. Changsha 41282 Beijing Hao Industrial Electronics Co., Ltd., the preface of the EDM machine processing, the pulse frequency is very high, due to the instantaneous discharge between the electrode and the workpiece, the pulse peak current is up to 100 people and 200 people, therefore, the processing process is very sensitive to external interference, If the computer in the power cabinet crashes due to interference or transmits incorrect information, it will cause all the system to temporarily smash or scrap the parts, causing accidents. Therefore, whether the interference can be completely eliminated on the machine tool will be directly related to the machine tool. 1 often make and the processing quality of the product.
1 Interference into the system path analysis This grounding method requires that the signal ground power in the power cabinet is connected to the public ground point. and. In the process of numerically controlled board EDM machine, the way of interference into the system has a space induction, the power system, the connection process of the computer and the controlled equipment, the skin, the test, the channel. Ton Cambodia, through the actual study of various interferences on the machine power supply cabinet components 1 reasonable department of the strong electric board should have a thick enough protective grounding cable. If the cross section is 5.
51412 grounding cable, and the total common grounding point must be in good contact with the earth, the general required resistance is less than 47. The power supply cabinet is designed and manufactured, and also pay attention to various internal interference random noise. Take the corresponding measures. 3 is the AC in the power cabinet, using the noise of the electrical appliance to touch the road. 10 AC contactors. When the AC machine starts and stops frequently, a magnetic induction phenomenon will cause waves in the control circuit of the machine tool. Noise such as spikes, interference with the computer or servo system after the design of the product sweat system. With the least and shortest connection. At least cross-link. Strong and weak electricity separation. The functional components are relatively concentrated, the power circuit is arranged separately and the maintenance is convenient, and the functional components are divided. The power board and the current limiting resistor of the pulse power supply are placed as close as possible to the edge of the cabinet and the heat dissipation and ventilation are considered. The shield is isolated.
2 shame and grounding 1 shielding principle. The electrostatic shield must be connected to the zero signal reference potential of the shielded circuit, and the junction of the zero signal reference potential must ensure that the interference current does not flow through the signal line. For example, the connection between the power cabinet and the machine host is most likely to bring interference into the computer. Therefore, these cables must be shielded cables, and the cables connected to the phase power motors should also be shielded and grounded. In the real-time control system, proper grounding is the main measure to suppress interference. The correct grounding and shielding combined can overcome most of the interference. Therefore, the grounding method in the line and system is very sophisticated, and the grounding wire should be grounded. Radiant grounding method.
The normal work. Adding a deduction network to these appliances changes the line impedance of the inductive component. The voltage of the two ends of the AC contactor line and the AC motor phase is stable at the start and stop, and the noise generated by the electric appliance is suppressed. The circuit of the DC relay DC solenoid valve in the electric cabinet is reduced, and the DC inductance component is broken. In the electric coil, a large induced electromotive force will be generated, and a freewheeling diode is connected in parallel at both ends of the inductor element to release the induced electromotive force generated when the coil is de-energized, thereby reducing the interference of the coil induced electromotive force to the control circuit. The phase filter is added, and then the isolation power transformer is used to input the power board. The computer power supply is powered by a power supply with excellent performance or by a switching power supply. The isolation transformer and the computer power supply line are added with a single-phase stranded wire. The pitch of the twisted wire should be as small as possible. The wiring length is as short as possible.
To enhance its ability to suppress inductive interference.
Principle 5, when the input signal is 0, the photodiode element light-emitting diode is not bright. The photodiode is turned off and the output is 0; when the input ei number is 1. The phototransistor element illuminates the illuminating pole tube, and the photodiode tube is turned on after being illuminated, and the output is not common to the input and output. In this way, the design of the printed circuit board 0 with a multi-layer printed circuit board can be suppressed. High-frequency circuits are highly integrated. The wiring density is large, and the use of a multi-layer printed circuit board is not only necessary for wiring, but also a multi-pane board for reducing interference. Not only can you make full use of the middle layer setting. It can also be best implemented to reduce the parasitic capacitance, effectively shorten the signal transmission length, and greatly reduce the signal cross-interference to rationally route the double-layer printed circuit board. Place the power device close to the power supply, and connect the connected power line as short as possible, and avoid crossing with the signal line. Apply copper as the ground wire as much as possible on the surface of the circuit board, which can not only reduce high-frequency interference. It also enhances the strength and heat dissipation of the printed board. For the busbar board, the tinned grid strip is added to the entire fixed surface of the metal chassis, which not only improves the printing plate squealing degree to ensure good contact, but also forms a suitable common grounding wire with a metal casing. Improve the shielding effect and enhance the anti-interference ability =, the less the lead between the high-frequency circuit devices is bent, the better the high-frequency wiring is to take the full line. Need to turn to pray for a 45 degree prayer line or 05 arc turn, to meet this requirement, can reduce the external emission and coupling of the Gaopan signal.
A high frequency decoupling capacitor is placed near each integrated circuit block, away from the power incoming line area. Setting the filter capacitor 3 conclusions proved practical. After the above-mentioned anti-interference measures are adopted in the power supply cabinet of the numerical control EDM machine, the stability of the machining process of the machine tool and the machining accuracy of the workpiece are greatly improved.
1 Guan Shichang. Interference with CNC machine tools. machine tool. 199152 Wang Shiming anti-jamming machine tool and hydraulic system of microcomputer control system, 199843 Bi Chengen. Modern CNC Machine Tool Machinery Industry Press. In 1991, the 12th page of Wuxi Vocational School was attached. In, from the instance, discover the field debugging and control system during the logging process. We can get the following results for object-oriented functional real-time programming with heterogeneity. The developed control system software function code has a high reusability. The deaf-based software structure provides a multi-level openness for the software development of the control system. The control software developed in the component mode has the characteristics of reusability, maintainability and reliability. The local autonomy of the functional entity components of the real-time distributed control makes the control system more robust. Even if the control system adopts the control module into a component failure. Also + will cause the system to crash.
The control system of the hierarchical distributed control architecture can trust the control of the componentized flexible manufacturing system. It can not only control the Gang 3, such as CNC machine transport systems and robots.
2342424 Zhou Binghai, Tong Jinsong, Cai Jianguo is based on the 00 immortal object-oriented Qing 8 control system model. Combined machine tools and automated machining technology, 199993944
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