An electrical protection circuit for cutting off servo power

Abstract

The invention discloses an electrical protection circuit for cutting off servo power, comprising a power-on button SB1, a power-off button SB2, an AC contactor KM1, a DC switching power supply GS1, an emergency stop button SB3, a safety switch reset button SB4, an AC contactor KM2, a left window switch SQ1, a front door switch SQ2, a right window switch SQ3, a numerical control system A1, an I / O unit A2, a servo amplifier A3, a safety relay A4, a brake relay KA1, an X-axis servo motor M1, a Y-axis servo motor M2, a Z-axis servo motor M3, and a spindle servo motor M4; one end of the power-on button SB1 is connected to one end of the power-off button SB2. The invention adopts a dual-loop control of a machining center control circuit, and realizes this function through a safety relay A4, a numerical control system A1, and a servo amplifier A3, thereby improving the safety of a numerical control machine tool.

Description

Technical Field

[0001] The invention relates to the technical field of electrical protection circuits, and in particular to an electrical protection circuit for cutting off servo power. Background Art

[0002] At present, during the actual processing and operation of the machine tool, the operator may need to come into close contact with the workbench and the workpiece. At this time, the servo motor is in an excited state, which may pose a threat to the safety of the operator, and the safety of the equipment is not high. Summary of the invention

[0003] In order to overcome the above-mentioned technical problems, the purpose of the present invention is to provide an electrical protection circuit for cutting off the servo power, which adopts the dual-loop control of the machining center control circuit, and realizes this function through the safety relay A4, the numerical control system A1 and the servo amplifier A3, thereby improving the safety of the numerical control machine tool. Its purpose is to cut off the driving power between the servo amplifier A3 and the servo motor when the operator is in close contact with the workbench and the workpiece during the actual processing and operation of the machine tool, thereby providing good protection measures for the operator when he is in close contact with the workbench and the workpiece, thereby improving the safety protection of the machine tool and the safety of personnel operation.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] An electrical protection circuit for cutting off servo power, comprising a power-on button SB1, a power-off button SB2, an AC contactor KM1, a DC switching power supply GS1, an emergency stop button SB3, a safety switch reset button SB4, an AC contactor KM2, a left window switch SQ1, a front door switch SQ2, a right window switch SQ3, a numerical control system A1, an I / O unit A2, a servo amplifier A3, a safety relay A4, a brake relay KA1, an X-axis servo motor M1, a Y-axis servo motor M2, a Z-axis servo motor M3, and a spindle servo motor M4;

[0006] One end of the power-on button SB1 is connected to one end of the power-off button SB2, the other end of the power-off button SB2 is connected to the coil of the AC contactor KM1, and another group of normally open contacts of the AC contactor KM1 is connected to the DC switching power supply GS1;

[0007] The output end of the DC switching power supply GS1 is respectively connected to the safety relay A4, the I / O unit A2, the numerical control system A1, and the servo amplifier A3, and the output end of the DC switching power supply GS1 is connected to one end of the coil of the brake relay KA1, and the DC switching power supply GS1 is connected to the brake plug of the Z-axis servo motor M3 through one end of the normally open contact of the brake relay KA1;

[0008] One end of the left window switch SQ1 is connected to the safety relay A4, the other end of the left window switch SQ1 is connected in series with one end of the front door switch SQ2, the other end of the front door switch SQ2 is connected in series with one end of the right window switch SQ3, the other end of the right window switch SQ3 is connected to the safety relay A4, and the safety switch reset button SB4 is connected to the safety relay A4;

[0009] The servo amplifier A3 is connected to the AC contactor KM2, and one end of the servo amplifier A3 is connected to the numerical control system A1 and the I / O unit A2 respectively.

[0010] Furthermore, a group of normally open contacts of the AC contactor KM1 is connected in parallel to two ends of the power-on button SB1.

[0011] Furthermore, a group of normally closed contacts of the emergency stop button SB3 is connected to the I / O unit A2.

[0012] Furthermore, another group of normally closed contacts of the emergency stop button SB3 is connected to the servo amplifier A3.

[0013] Furthermore, the two groups of delayed disconnection normally open contacts of the safety relay A4 are respectively connected to the servo amplifier A3.

[0014] Furthermore, another group of normally open contacts of the safety relay A4 is connected to the I / O unit A2.

[0015] Furthermore, the other end of the servo amplifier A3 is connected to the X-axis servo motor M1, the Y-axis servo motor M2, the Z-axis servo motor M3, and the spindle servo motor M4 respectively.

[0016] Beneficial effects of the present invention:

[0017] The present invention adopts dual-loop control of the control circuit of the machining center, and realizes this function through the safety relay A4, the numerical control system A1 and the servo amplifier A3. When any one of the left window, the right window and the front door is opened, the safety relay A4 first disconnects the X4.3 signal. If the machine tool stops the feed shaft operation and the spindle rotation when the machine tool is automatically running, the brake power is disconnected after a delay of 0.5S to lock the Z-axis servo motor M3, and the dual-loop signals of the servo shaft and the spindle of the servo amplifier A3 are disconnected after a delay of 2S. X5.5 and X5.6 are fed back to the numerical control system A1, thereby cutting off the power supply of the feed servo motor and the spindle servo motor M4, ensuring the work safety of the workpiece disassembly and assembly in the preparation operation of the machine tool when the protective door is opened in the machining area, thereby improving the equipment safety and personal safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] Figure 1 is an electrical schematic diagram of the present invention;

[0020] Figure 2 It is a PMC control diagram for releasing the emergency stop in the present invention;

[0021] Figure 3 It is a PMC control diagram for releasing the brake in the present invention;

[0022] Figure 4 It is a PMC control diagram of the three-axis servo shutdown in the present invention;

[0023] Figure 5 It is a PMC control diagram for restoring the brake in the present invention;

[0024] Figure 6 It is the PMC control diagram of the spindle forward rotation shutoff in the present invention;

[0025] Figure 7 It is a PMC control diagram of the spindle reverse shutdown in the present invention;

[0026] Figure 8 It is a PMC control diagram for stopping the feed axis in the present invention. DETAILED DESCRIPTION

[0027] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-8 As shown, an electrical protection circuit for cutting off servo power includes a power-on button SB1, a power-off button SB2, an AC contactor KM1, a DC switching power supply GS1, an emergency stop button SB3, a safety switch reset button SB4, an AC contactor KM2, a left window switch SQ1, a front door switch SQ2, a right window switch SQ3, a numerical control system A1, an I / O unit A2, a servo amplifier A3, a safety relay A4, a brake relay KA1, an X-axis servo motor M1, a Y-axis servo motor M2, a Z-axis servo motor M3, and a spindle servo motor M4;

[0029] One end of the power-on button SB1 is connected to one end of the power-off button SB2, the other end of the power-off button SB2 is connected to the coil of the AC contactor KM1, a group of normally open contacts of the AC contactor KM1 is connected in parallel to the two ends of the power-on button SB1, and another group of normally open contacts of the AC contactor KM1 is connected to the DC switching power supply GS1;

[0030] The output end of the DC switching power supply GS1 is respectively connected to the safety relay A4, the I / O unit A2, the numerical control system A1, and the servo amplifier A3, and the output end of the DC switching power supply GS1 is connected to one end of the coil of the brake relay KA1, and the DC switching power supply GS1 is connected to the brake plug of the Z-axis servo motor M3 through one end of the normally open contact of the brake relay KA1, a group of normally closed contacts of the emergency stop button SB3 is connected to the I / O unit A2, and another group of normally closed contacts of the emergency stop button SB3 is connected to the servo amplifier A3;

[0031] One end of the left window switch SQ1 is connected to the safety relay A4, the other end of the left window switch SQ1 is connected in series with one end of the front door switch SQ2, the other end of the front door switch SQ2 is connected in series with one end of the right window switch SQ3, the other end of the right window switch SQ3 is connected to the safety relay A4, the safety switch reset button SB4 is connected to the safety relay A4, two groups of delayed disconnection normally open contacts of the safety relay A4 are respectively connected to the servo amplifier A3, and another group of normally open contacts of the safety relay A4 is connected to the I / O unit A2;

[0032] The servo amplifier A3 is connected to the AC contactor KM2, one end of the servo amplifier A3 is respectively connected to the numerical control system A1 and the I / O unit A2, and the other end of the servo amplifier A3 is respectively connected to the X-axis servo motor M1, the Y-axis servo motor M2, the Z-axis servo motor M3, and the spindle servo motor M4.

[0033] Working principle: First, press the power-on button SB1, and the normally open contact of AC contactor KM1 is self-locked to make AC contactor KM1 close and DC switch power supply GS1 powered, and CNC system A1, I / O unit A2, servo amplifier A3 and safety relay A4 are powered at the same time, and CNC system A1 starts and displays after self-check; then close the left window, front door and right window, and press the safety switch reset button SB4, and safety relay A4 works normally and outputs, CNC system A1 receives X4.3 as high level, and turns on 57 and 58, 67 and 68 feet to give the servo amplifier's A1-B1, A2-B2 servo axes and A4-B4, A5-B5 spindles dual-circuit signals; unscrew the emergency stop button SB3, and CNC system A1 detects that X8.4 changes from low level 0 to high level 1 through I / O unit A2;

[0034] Figure 2The G8.4 emergency stop signal and the G71.1 spindle emergency stop signal are turned on, and the servo amplifier A3 detects that the 2nd and 3rd pins of CX4 are turned from disconnected to connected. After the CNC system A1 and the servo amplifier A3 self-check and there is no alarm, the internal contacts of the servo amplifier A3 are closed and the AC contactor KM2 coil is energized through the CX3 output. The normally open contacts of the AC contactor KM2 are closed, and the servo amplifier A3 is energized;

[0035] Figure 3 Y3.3 in the circuit is energized, causing the brake relay KA1 to energize. The normally open contact of the brake relay KA1 is closed, releasing the brake of the Z-axis servo motor M3, thus preparing for the normal operation of the machine tool. In the normal operation of the machine tool, when disassembling and assembling workpieces in the preparation of the machine tool, it is possible to work in the processing area with the protective door open. Or when the protective door is opened unintentionally, any switch or circuit of the left window switch SQ1, the front door switch SQ2 and the right window switch SQ3 connected in series by the double circuit is disconnected, causing the safety relay A4 to stop working. The safety relay A4 first disconnects the X4.3 signal pins 13 and 14. After the CNC system A1 receives that X4.3 is at a low level, if the machine tool is running automatically, the feed axis is stopped and the spindle forward and reverse signals of G70.4 and G70.5 are cut off. After a delay of 0.5S, the output of Y3.3 is disconnected, and the brake relay KA The coil of 1 loses power, and the normally open contact of the brake relay KA1 is disconnected to lock the Z-axis servo motor M3 to prevent the vertical axis from falling after the servo power supply is cut off. After a delay of 2S, the dual-loop signals of pins 57 and 58, pins 67 and 68, the A1-B1, A2-B2 servo axes of the servo amplifier and the A4-B4, A5-B5 spindles are disconnected, and X5.5 and X5.6 are fed back to the CNC system A1 through A3-B3 and A4-B4 via the I / O unit A2, and the three-axis servo shutdown signals G126.0, G126.1, and G126.2 are turned on through the PMC, thereby cutting off the power supply of the X-axis servo motor M1, the Y-axis servo motor M2, the Z-axis servo motor M3 and the spindle servo motor M, ensuring the work safety of the workpiece in the processing area with the protective door open when performing operations such as disassembly and assembly of the workpiece during the preparation of the machine tool, thereby improving equipment safety and personal safety.

[0036] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0037] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. An electrical protection circuit for cutting off servo power, characterized in that: Including power-on button SB1, power-off button SB2, AC contactor KM1, DC switching power supply GS1, emergency stop button SB3, safety switch reset button SB4, AC contactor KM2, left window switch SQ1, front door switch SQ2, right window switch SQ3, CNC system A1, I / O unit A2, servo amplifier A3, safety relay A4, brake relay KA1, X-axis servo motor M1, Y-axis servo motor M2, Z-axis servo motor M3, spindle servo motor M4; One end of the power-on button SB1 is connected to one end of the power-off button SB2, the other end of the power-off button SB2 is connected to the coil of the AC contactor KM1, and another group of normally open contacts of the AC contactor KM1 is connected to the DC switching power supply GS1; The output end of the DC switching power supply GS1 is respectively connected to the safety relay A4, the I / O unit A2, the numerical control system A1, and the servo amplifier A3, and the output end of the DC switching power supply GS1 is connected to one end of the coil of the brake relay KA1, and the DC switching power supply GS1 is connected to the brake plug of the Z-axis servo motor M3 through one end of the normally open contact of the brake relay KA1; One end of the left window switch SQ1 is connected to the safety relay A4, the other end of the left window switch SQ1 is connected in series with one end of the front door switch SQ2, the other end of the front door switch SQ2 is connected in series with one end of the right window switch SQ3, the other end of the right window switch SQ3 is connected to the safety relay A4, and the safety switch reset button SB4 is connected to the safety relay A4; The servo amplifier A3 is connected to the AC contactor KM2, and one end of the servo amplifier A3 is connected to the numerical control system A1 and the I / O unit A2 respectively; A group of normally open contacts of the AC contactor KM1 are connected in parallel to the two ends of the power-on button SB1; A set of normally closed contacts of the emergency stop button SB3 is connected to the I / O unit A2; Another group of normally closed contacts of the emergency stop button SB3 is connected to the servo amplifier A3; The two groups of delayed disconnection normally open contacts of the safety relay A4 are respectively connected to the servo amplifier A3; Another group of normally open contacts of the safety relay A4 is connected to the I / O unit A2; The other end of the servo amplifier A3 is connected to the X-axis servo motor M1 , the Y-axis servo motor M2 , the Z-axis servo motor M3 , and the spindle servo motor M4 , respectively.

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