Control circuit of numerical control machine tool for curved surface grinding of carbon brush

Abstract

The invention belongs to the technical field of control of numerical control machine tools and discloses a control circuit of a numerical control machine tool for curved surface grinding of a carbon brush. The control circuit comprises sensors, a PLC, a spindle motor frequency converter, a stepping motor driver and an auxiliary power source. The sensors are arranged on a grinding spindle and usedfor detecting the position of the grinding spindle; the PLC is used for generating a driving control pulse according to signals of the sensors and a received control signal; the stepping motor driveris used for controlling a stepping motor to operate so as to drive a grinding cutter to move transversely according to the driving control pulse; the spindle motor frequency converter is used for controlling a spindle motor to operate so as to drive the grinding cutter to rotate according to a received start-stop signal; and the auxiliary power source is used for being connected with an external alternate current power source for supplying power to the spindle motor frequency converter and the PLC and used for converting the alternate current power source which is connected externally into a 24V direct current power source for supplying power to the stepping motor driver. Under control of the control circuit, automatic positioning of the carbon brush and control over a grinding path are achieved, the machining precision is improved significantly, and the controllability aspect is optimized significantly.

Description

technical field [0001] The invention belongs to the technical field of carbon brush numerical control grinding processing control, and more specifically relates to a control circuit of a carbon brush curved surface grinding numerical control machine tool. Background technique [0002] As the hub of electric energy transmission in the main converter unit, the carbon brush’s status directly affects whether the main converter unit works normally, and then determines the reliability level of the entire ship’s power system. Once the carbon brush is excessively worn or broken, The corresponding carbon brushes need to be replaced immediately, and the new carbon brushes must be ground before replacement so that the contact surface between the carbon brushes and the commutator of the unit reaches the fullest arc. A uniform oxide film is formed on the surface of the commutator to reduce abnormal wear on the surface of the commutator; the second is to prolong the service life of a sing...

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Problems solved by technology

[0003] At present, the commonly used method is to use a grinder and manual grinding, but there are some shortcomings and deficiencies in the manual grinding method, such as (1) The grinding tool is the core component of the whole device, which directly affects the grinding accuracy and grinding effect of the carbon brush. The radian of the brush working surface depends entirely on the radius of the grinding wheel, and the grinding accuracy and smoothness of the grinding surface cannot be guaranteed; (2) The number of carbon brushes for a single grinding is small, which takes a long time and the grinding efficiency is low; (3) The surface of the grinding wheel is very easy to adhere to carbon powder , and it is not easy to clean, which will cause the failure of the grinding wheel; (4) The contact surface between the carbon brush and the commutator of the unit is not well matched, and the carbon powder is dusty, which greatly affects the maintenance efficiency of the main transformer

[0004] In the prior art, there are also methods of using CNC engraving machines and computer operations. The disadvantages of this method are (1) it needs to be connected to a computer and programmed for control, and the operation is complicated; (2) it needs to be equipped with peripheral equipment such as waterways and pneumatics, which is inconvenient to use; Long processing cycle and low efficiency

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