Sampled adaptive circuit and method for wire-cut wire erosion machining using the same

Abstract

The application provides a sampling adaptive circuit, comprising a collection circuit, which is electrically connected with a selection circuit and an adjusting circuit; the collection circuit comprises a first single-chip microcomputer, a fifth pin of the first single-chip microcomputer is electrically connected with a first resistor, the other end of the first resistor is electrically connected with the anode of a second diode, the cathode of the second diode is connected with a second resistor, a third resistor and a first rheostat in sequence, and the adjusting end of the first rheostat is electrically connected with the positive phase input end of an amplifier; the fourth pin of the first single-chip microcomputer is electrically connected with a first diode, a first capacitor and a third diode in parallel, the cathode of the first diode is electrically connected to the circuit between the first resistor and the second diode, the other end of the first capacitor is electrically connected to the circuit between the second diode and the second resistor, and the cathode of the third diode is electrically connected to the circuit between the second resistor and the third resistor.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wire cutting machine tools, and particularly relates to a self-adaptive circuit and a wire cutting and wire feeding processing method using the same. BACKGROUND

[0002] The wire cutting machine tool belongs to the category of electric processing, and its basic physical principle is that free positive ions and electrons accumulate in a field, and soon form an ionized conductive channel.

[0003] During the wire cutting process, an electric current is formed between the two plates, resulting in countless collisions between particles, forming a plasma zone and quickly rising to a high temperature of 8000 to 12000 degrees, instantaneously melting some materials on the surface of the two conductors; at the same time, due to the vaporization of the electrode and the dielectric liquid, a bubble is formed, and its pressure rises regularly until it is very high, and then the current is interrupted, the temperature suddenly drops, causing an explosion inside the bubble, generating power to throw the melted material out of the crater, and then the corroded material is re-condensed into small spheres in the dielectric liquid and is discharged by the dielectric liquid. Then through the monitoring and control of NC control and the execution of the servo mechanism, the discharge phenomenon is uniform and consistent, so that the workpiece is processed to become a product with required size accuracy and shape accuracy.

[0004] During the processing of the wire cutting machine tool, due to the difference of the processed materials, the difference of the workpiece height, the difference of the processing power voltage, and the difference of the processing state, different processing speeds are required; at present, the processing speed of the existing wire cutting machine tool driver is mostly artificially controlled, and the self-adaptive degree is not high. SUMMARY

[0005] The purpose of the present application is to provide a self-adaptive circuit and a wire cutting and wire feeding processing method using the same

[0006] A sampling self-adaptive circuit, comprising: a collection circuit, the collection circuit being electrically connected with a selection circuit and an adjustment circuit;

[0007] The collection circuit comprises a first single-chip microcomputer,

[0008] The fifth pin of the first single-chip microcomputer is electrically connected with a first resistor, the other end of the first resistor is electrically connected with the anode of a second diode, the cathode of the second diode is connected with a second resistor, a third resistor and a first variable resistor in sequence, and the adjustment end of the first variable resistor is electrically connected with the positive input end of an amplifier;

[0009] The fourth pin of the first single-chip microcomputer is electrically connected with a first diode, a first capacitor and a third diode in parallel, the cathode of the first diode is electrically connected to a circuit between a first resistor and a second diode, the other end of the first capacitor is electrically connected to a circuit between the second diode and a second resistor, and the cathode of the third diode is electrically connected to a circuit between a second resistor and a third resistor;

[0010] The non-inverting input end of the amplifier is electrically connected with a second capacitor and a fourth resistor in parallel, the other end of the second capacitor is electrically connected to the output end of the amplifier, the other end of the fourth resistor is electrically connected to the negative electrode of an external power supply of the amplifier, and the negative electrode of the external power supply of the amplifier is also electrically connected to the anode of the third diode;

[0011] The output end of the amplifier is electrically connected to a fifth resistor, the other end of the fifth resistor is electrically connected to the second pin of a linear optical coupler, the non-inverting input end of the amplifier is also electrically connected to the fourth pin of the linear optical coupler, the sixth pin of the linear optical coupler is electrically connected to the positive electrode of an external power supply, the fifth pin of the linear optical coupler is electrically connected with a sixth resistor, the other end of the sixth resistor is connected to the negative electrode of the external power supply, the fifth pin of the linear optical coupler is also electrically connected with a seventh resistor, a second variable resistor, an eighth resistor and a fifth diode in series, the cathode of the fifth diode is electrically connected to the negative electrode of the external power supply, the adjusting end of the second variable resistor is electrically connected with a ninth resistor, the other end of the ninth resistor is electrically connected to the base of a first triode, the collector of the first triode is electrically connected with a tenth resistor, the other end of the tenth resistor is electrically connected to the positive electrode of the external power supply, the emitter of the first triode is electrically connected with a twelfth resistor and a fourth diode in parallel, the other end of the twelfth resistor is electrically connected to a circuit between the eighth resistor and the fifth diode, the cathode of the fourth diode is electrically connected to the negative electrode of the external power supply, the circuit between the ninth resistor and the base of the first triode is electrically connected with an eleventh resistor, the other end of the eleventh resistor is electrically connected to a circuit between the eighth resistor and the fifth diode.

[0012] Preferably, the selection circuit comprises a first relay,

[0013] The fifth pin of the first single-chip microcomputer is electrically connected to a selection switch, the selection switch is also electrically connected to the coil terminal of the first relay, the first relay is electrically connected with a light-emitting diode and a twenty-fourth resistor in series, and the first relay is coupled with the high-low voltage sampling signal.

[0014] The selection circuit is provided with at least two circuits, the first circuit is a seventh diode and a twenty-third resistor in series, and the other end of the twenty-third resistor is electrically connected to a circuit between the second resistor and the third resistor; and the second circuit is a sixth diode and a twenty-second resistor in series, and the other end of the twenty-second resistor is electrically connected to a circuit between the second diode and the second resistor.

[0015] Preferably, the adjusting circuit comprises a second single-chip microcomputer, the second single-chip microcomputer is electrically connected with a second relay, the second relay is coupled with a slow sampling selection signal;

[0016] The seventh pin of the second single-chip microcomputer is electrically connected with a thirteenth resistor and a third capacitor in parallel, the other end of the third capacitor is electrically connected with the negative electrode of an external power supply, and the other end of the thirteenth resistor is electrically connected with the emitter of a first triode;

[0017] The first pin and the sixth pin of the second single-chip microcomputer are electrically connected, the sixth pin is provided with a fourth capacitor and a seventeenth resistor in parallel, the seventeenth resistor is connected with an eighteenth resistor in series, the other end of the eighteenth resistor is electrically connected with the negative electrode of an external power supply, and the other end of the fourth capacitor is electrically connected to the circuit between the seventeenth resistor and the eighteenth resistor;

[0018] The third pin of the second single-chip microcomputer is electrically connected with a nineteenth resistor, the other end of the nineteenth resistor is electrically connected with the base of a second triode, the emitter of the second triode is electrically connected with the negative electrode of an external power supply, the collector of the second triode is electrically connected with a twenty-first resistor, the other end of the twenty-first resistor is electrically connected with the positive electrode of an external power supply, the circuit between the nineteenth resistor and the second triode is electrically connected with a twentieth resistor, and the other end of the twentieth resistor is electrically connected with the positive electrode of an external power supply;

[0019] The fourth pin of the second single-chip microcomputer is electrically connected with the negative electrode of an external power supply;

[0020] The eighth pin of the second single-chip microcomputer is electrically connected with the positive electrode of an external power supply;

[0021] The fifth pin of the second single-chip microcomputer is electrically connected with a fourteenth resistor, the other end of the fourteenth resistor is electrically connected with the positive electrode of an external power supply, the fifth pin of the second single-chip microcomputer is electrically connected with the G port of a second relay, and the G port of the second relay is electrically connected with a selection switch;

[0022] The second pin of the second single-chip microcomputer is electrically connected with a fifteenth resistor, the other end of the fifteenth resistor is electrically connected with the F port of the second relay, and the F port of the second relay is electrically connected with a selection switch.

[0023] Preferably, the second relay is provided with at least four circuits, and the other ends of the four circuits are electrically connected with the negative electrode of an external power supply;

[0024] A fifth capacitor is electrically connected to the third circuit, a sixth capacitor is electrically connected to the fourth circuit, a third variable resistor is electrically connected to the fifth circuit, a fourth variable resistor is electrically connected to the sixth circuit, and the fifth capacitor, the sixth capacitor, the third variable resistor and the fourth variable resistor are connected in parallel.

[0025] Preferably, a method for wire cutting machining using a sampling adaptive circuit comprises the following processes:

[0026] S1, the fifth pin of the first single-chip microcomputer is point A, the fourth pin is point B, and point A and point B are the collection ends of the machining state of the machine tool;

[0027] S2, according to different machining power supply voltages, different circuits are selected through the switching of the selection switch of the first relay, different voltage division ratios are achieved, and thus the voltage of point C is changed;

[0028] S3, the voltage of point C is isolated and amplified by the amplifier to obtain the voltage of point D;

[0029] S4, the voltage of point D is signal-amplified by the first triode, and thus the voltage of point E is obtained;

[0030] S5, after the voltage of point E enters the second single-chip microcomputer, according to different machining materials, different circuits are selected through the switching of the selection switch of the second relay, and thus the resistance value and the capacitance input value of points G and F are changed, and then the RC input value of the second single-chip microcomputer is changed, and thus the proportional relationship between the output frequency of point H and the input voltage of point E is changed;

[0031] S6, the output frequency of point H is amplified by the second triode to obtain the output frequency of point I, and point I is electrically connected with the driver, and thus the walking speed of the corresponding motor can be controlled.

[0032] The sampling adaptive circuit can collect the voltage of the working state of the wire cutting machine tool, select different circuits through the first relay according to different voltage values, generate different voltage division ratios, adjust the voltage of point C, obtain the voltage of point E after the voltage of point C is isolated and amplified, select different circuits through the second relay according to different machining materials, change the RC input value of the second single-chip microcomputer, adjust the proportional relationship between the input frequency of point H and the input voltage of point E to adjust the walking frequency of the driver, and thus the walking speed of the motor can be controlled, which is beneficial to improving the adaptive ability of the wire cutting machine tool, and the machining speed can be adjusted according to different machining materials, machining states and power supply voltages. The sampling adaptive circuit has the advantages of reasonable structure, simple operation, strong use flexibility and the like, and is beneficial to popularization and use. BRIEF DESCRIPTION OF DRAWINGS

[0033] The accompanying drawings are used to provide further understanding of the present application, and constitute a part of the specification, and are used to explain the present application together with embodiments of the present application, and do not constitute a limitation to the present application. In the drawings:

[0034] Fig. 1 is a circuit diagram of the present application.

[0035] Fig. 2 is a circuit diagram of a sampling circuit of the present application;

[0036] Fig. 3 is a circuit diagram of a selection circuit of the present application;

[0037] Fig. 4 is a circuit diagram of an adjustment circuit of the present application. DETAILED DESCRIPTION

[0038] As Figs. 1 to 4 shown, a sampling adaptive circuit comprises a collection circuit, which is electrically connected with a selection circuit and an adjustment circuit, the collection circuit is used to collect the voltage of a processing power supply and process the collected voltage, the selection circuit is used to select different voltage division ratios according to the voltage value collected by the collection circuit, and the adjustment circuit is used to adjust the ratio of input voltage to output frequency according to different processing materials, so as to adjust the walking speed of the motor.

[0039] The collection circuit comprises a first single-chip microcomputer P2, and a 12V external power supply is electrically connected to the first single-chip microcomputer P2.

[0040] A fifth pin of the first single-chip microcomputer P2 is electrically connected with a first resistor R1, another end of the first resistor R1 is electrically connected with an anode of a second diode D2, and a cathode of the second diode D2 is connected with a second resistor R2, a third resistor R3 and a first rheostat RP1 in sequence, and an adjusting end of the first rheostat RP1 is electrically connected with a positive-phase input end of an amplifier.

[0041] A fourth pin of the first single-chip microcomputer P2 is electrically connected with a first diode D1, a first capacitor C1 and a third diode D3 in parallel, a cathode of the first diode D1 is electrically connected to a circuit between the first resistor R1 and the second diode D2, another end of the first capacitor C1 is electrically connected to a circuit between the second diode D2 and the second resistor R2, and a cathode of the third diode D3 is electrically connected to a circuit between the second resistor R2 and the third resistor R3.

[0042] The amplifier is electrically connected with a second capacitor C2 and a fourth resistor R4 in parallel at an inverting input end, another end of the second capacitor C2 is electrically connected with an output end of the amplifier, another end of the fourth resistor R4 is electrically connected with a negative pole of an external power supply of the amplifier, and the negative pole of the external power supply of the amplifier is also electrically connected with an anode of the third diode D3.

[0043] The output end of the amplifier is electrically connected with the fifth resistor R5, the other end of the fifth resistor R5 is electrically connected with the second pin of the linear photoelectric coupler, the inverting input end of the amplifier is also electrically connected with the fourth pin of the linear photoelectric coupler, the sixth pin of the linear photoelectric coupler is electrically connected with the positive pole of the external power supply, the fifth pin of the linear photoelectric coupler is electrically connected with the sixth resistor R6, the other end of the sixth resistor R6 is connected with the negative pole of the external power supply, the fifth pin of the linear photoelectric coupler is also electrically connected with the seventh resistor R7, the second rheostat RP2, the eighth resistor R8 and the fifth diode D5 in series, the cathode of the fifth diode D5 is electrically connected with the negative pole of the external power supply, the adjusting end of the second rheostat RP2 is electrically connected with the ninth resistor R9, the other end of the ninth resistor R9 is electrically connected with the base of the first triode Q1, the collector of the first triode Q1 is electrically connected with the tenth resistor R10, the other end of the tenth resistor R10 is electrically connected with the positive pole of the external power supply, the emitter of the first triode Q1 is electrically connected with the twelfth resistor R12 and the fourth diode D4 in parallel, the other end of the twelfth resistor R12 is electrically connected to the circuit between the eighth resistor R8 and the fifth diode D5, the cathode of the fourth diode D4 is electrically connected with the negative pole of the external power supply, the circuit between the ninth resistor R9 and the base of the first triode Q1 is electrically connected with the eleventh resistor R11, the other end of the eleventh resistor R11 is electrically connected to the circuit between the eighth resistor R8 and the fifth diode D5.

[0044] Further, the selection circuit comprises a first relay K1,

[0045] The fifth pin of the first single-chip microcomputer P1 is electrically connected with a selection switch, the selection switch is also electrically connected with the coil terminal of the first relay K1, the first relay K1 is electrically connected with a light-emitting diode and a twenty-fourth resistor R24 in series, the first relay K1 is coupled with the high-low voltage sampling signal GDCY, the first relay K1 is also electrically connected with the positive pole of the external power supply, the first relay K1, the light-emitting diode and the twenty-fourth resistor R24 form a closed loop, the light-emitting diode plays an indicating role, and the lighting of the light-emitting diode indicates that the high-low voltage sampling signal GDCY passes through the closed loop;

[0046] The selection circuit is provided with at least two circuits, the first circuit is a series connection of a seventh diode D7 and a twenty-third resistor R23, the other end of the twenty-third resistor R23 is electrically connected to the circuit between the second resistor R2 and the third resistor R3; the second circuit is a series connection of a sixth diode D6 and a twenty-second resistor R22, the other end of the twenty-second resistor R22 is electrically connected to the circuit between the second diode D2 and the second resistor R2.

[0047] Further, the adjusting circuit comprises a second single-chip microcomputer U1, the second single-chip microcomputer U1 is electrically connected with a second relay K2, the second relay K2 is coupled with a slow sampling selection signal MSCY;

[0048] The seventh pin of the second single-chip microcomputer U1 is electrically connected with a thirteenth resistor R13 and a third capacitor C3 in parallel, the other end of the third capacitor C3 is electrically connected with the negative electrode of the external power supply, and the other end of the thirteenth resistor R13 is electrically connected with the emitter of a first triode Q1;

[0049] The first pin and the sixth pin of the second single-chip microcomputer U1 are electrically connected, the sixth pin is connected with a fourth capacitor C4 and a seventeenth resistor R17 in parallel, the seventeenth resistor R17 is connected with an eighteenth resistor R18 in series, the other end of the eighteenth resistor R18 is electrically connected with the negative electrode of the external power supply, and the other end of the fourth capacitor C4 is electrically connected to the circuit between the seventeenth resistor R17 and the eighteenth resistor R18;

[0050] The third pin of the second single-chip microcomputer U1 is electrically connected with a nineteenth resistor R19, the other end of the nineteenth resistor R19 is electrically connected with the base of a second triode Q2, the emitter of the second triode Q2 is electrically connected with the negative electrode of the external power supply, the collector of the second triode Q2 is electrically connected with a twenty-first resistor R21, the other end of the twenty-first resistor R21 is electrically connected with the positive electrode of the external power supply, the circuit between the nineteenth resistor R19 and the second triode Q2 is electrically connected with a twentieth resistor R20, and the other end of the twentieth resistor R20 is electrically connected with the positive electrode of the external power supply;

[0051] The fourth pin of the second single-chip microcomputer U1 is electrically connected with the negative electrode of the external power supply;

[0052] The eighth pin of the second single-chip microcomputer U1 is electrically connected with the positive electrode of the external power supply;

[0053] The fifth pin of the second single-chip microcomputer U1 is electrically connected with a fourteenth resistor R14, the other end of the fourteenth resistor R14 is electrically connected with the positive electrode of the external power supply, the fifth pin of the second single-chip microcomputer U1 is electrically connected with the G port of the second relay K2, and the G port of the second relay K2 is electrically connected with a selection switch;

[0054] The second pin of the second single-chip microcomputer U1 is electrically connected with a fifteenth resistor R15, the other end of the fifteenth resistor R15 is electrically connected with the F port of the second relay K2, and the F port of the second relay K2 is electrically connected with a selection switch.

[0055] Further, the second relay K2 is provided with at least four circuits, and the other ends of the four circuits are all electrically connected with the negative electrode of the external power supply;

[0056] The third circuit is electrically connected with a fifth capacitor C5, the fourth circuit is electrically connected with a sixth capacitor C6, the fifth circuit is electrically connected with a third rheostat RP3, the sixth circuit is electrically connected with a fourth rheostat RP4, and the fifth capacitor C5, the sixth capacitor C6, the third rheostat RP3 and the fourth rheostat RP4 are connected in parallel.

[0057] Further, a method for wire cutting and wire EDM using a sampling adaptive circuit comprises the following processes:

[0058] S1, the fifth pin of the first single-chip microcomputer P2 is point A, the fourth pin is point B, and points A and B are the collection ends of the machine tool measurement processing state;

[0059] S2, according to different processing power supply voltages, the selection switch on the first relay K1 is switched to select different circuits to achieve different voltage division ratios, thereby changing the voltage of point C;

[0060] S3, the voltage of point C is input into the linear optocoupler through the amplifier for isolation to obtain the voltage of point D;

[0061] S4, the voltage of point D is input into the first triode Q1 for signal amplification to obtain the voltage of point E;

[0062] S5, after the voltage of point E is input into the second single-chip microcomputer U1, according to different processing materials, the selection switch of the second relay K2 is switched to select different circuits, thereby changing the resistance value of point G and point F, the capacitance input value, further changing the RC input value of the second single-chip microcomputer, and changing the proportional relationship between the output frequency of point H and the input voltage of point E;

[0063] S6, the output frequency of point H is amplified by the second triode Q2 to obtain the output frequency of point I, and point I is electrically connected with the driver, so as to control the walking speed of the corresponding motor.

[0064] The above only describes the preferred embodiments of the present application and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement for some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A sampling adaptive circuit, comprising an acquisition circuit, characterized in that: The acquisition circuit is electrically connected to the selection circuit and the adjustment circuit; The acquisition circuit includes a first single chip microcomputer, The fifth pin of the first single-chip microcomputer is electrically connected to the first resistor, the other end of the first resistor is electrically connected to the anode of the second diode, the cathode of the second diode is connected in series with the second resistor, the third resistor and the first variable resistor, and the adjustment end of the first variable resistor is electrically connected to the non-inverting input end of the amplifier; The fourth pin of the first single-chip microcomputer is electrically connected to a first diode, a first capacitor, and a third diode connected in parallel, the cathode of the first diode is electrically connected to the circuit between the first resistor and the second diode, the other end of the first capacitor is electrically connected to the circuit between the second diode and the second resistor, and the cathode of the third diode is electrically connected to the circuit between the second resistor and the third resistor; The inverting input terminal of the amplifier is electrically connected to a second capacitor and a fourth resistor in parallel, the other end of the second capacitor is electrically connected to the output terminal of the amplifier, the other end of the fourth resistor is electrically connected to the negative electrode of the external power supply of the amplifier, and the negative electrode of the external power supply of the amplifier is also electrically connected to the anode of the third diode; The output end of the amplifier is electrically connected to the fifth resistor, the other end of the fifth resistor is electrically connected to the second pin of the linear optocoupler, the inverting input end of the amplifier is also electrically connected to the fourth pin of the linear optocoupler, the sixth pin of the linear optocoupler is electrically connected to the positive pole of the external power supply, the fifth pin of the linear optocoupler is electrically connected to the sixth resistor, the other end of the sixth resistor is connected to the negative pole of the external power supply, the fifth pin of the linear optocoupler is also electrically connected to the seventh resistor, the second variable resistor, the eighth resistor, and the fifth diode in series, the cathode of the fifth diode is electrically connected to the negative pole of the external power supply, and the adjustment end of the second variable resistor is electrically connected to the Nine resistors, the other end of the ninth resistor is electrically connected to the base of the first transistor, the collector of the first transistor is electrically connected to the tenth resistor, the other end of the tenth resistor is electrically connected to the positive electrode of the external power supply, the emitter of the first transistor is electrically connected to the twelfth resistor and the fourth diode in parallel, the other end of the twelfth resistor is electrically connected to the circuit between the eighth resistor and the fifth diode, the cathode of the fourth diode is electrically connected to the negative electrode of the external power supply, the circuit between the ninth resistor and the base of the first transistor is electrically connected to the eleventh resistor, and the other end of the eleventh resistor is electrically connected to the circuit between the eighth resistor and the fifth diode.

2. The sampling adaptive circuit according to claim 1, characterized in that The selection circuit includes a first relay, The fifth pin of the first single-chip microcomputer is electrically connected to the selection switch, and the selection switch is also electrically connected to the coil terminal of the first relay. The first relay is electrically connected to a light-emitting diode and a twenty-fourth resistor connected in series in sequence. The first relay is coupled to the high and low voltage sampling signals; The selection circuit has at least two circuits, the first circuit is a seventh diode and a twenty-third resistor connected in series, and the other end of the twenty-third resistor is electrically connected to the circuit between the second resistor and the third resistor; the second circuit is a sixth diode and a twenty-second resistor connected in series, and the other end of the twenty-second resistor is electrically connected to the circuit between the second diode and the second resistor.

3. The sampling adaptive circuit according to any one of claims 1 to 2, characterized in that: The regulating circuit includes a second single-chip microcomputer, the second single-chip microcomputer is electrically connected to a second relay, and the second relay is coupled to the slow sampling selection signal; The seventh pin of the second single-chip microcomputer is electrically connected to a thirteenth resistor and a third capacitor connected in parallel, the other end of the third capacitor is electrically connected to the negative electrode of the external power supply, and the other end of the thirteenth resistor is electrically connected to the emitter of the first transistor; The first pin and the sixth pin of the second single-chip microcomputer are electrically connected, the sixth pin is connected in parallel with a fourth capacitor and a seventeenth resistor, the seventeenth resistor and the eighteenth resistor are connected in series, the other end of the eighteenth resistor is electrically connected to the negative electrode of the external power supply, and the other end of the fourth capacitor is electrically connected to the circuit between the seventeenth resistor and the eighteenth resistor; The third pin of the second single-chip microcomputer is electrically connected to a nineteenth resistor, the other end of the nineteenth resistor is electrically connected to the base of the second transistor, the emitter of the second transistor is electrically connected to the negative electrode of the external power supply, the collector of the second transistor is electrically connected to a twenty-first resistor, the other end of the twenty-first resistor is electrically connected to the positive electrode of the external power supply, and a twentieth resistor is electrically connected to the circuit between the nineteenth resistor and the second transistor, the other end of the twentieth resistor is electrically connected to the positive electrode of the external power supply; The fourth pin of the second single-chip microcomputer is electrically connected to the negative pole of the external power supply; The eighth pin of the second single-chip microcomputer is electrically connected to the positive pole of the external power supply; The fifth pin of the second single-chip microcomputer is electrically connected to a fourteenth resistor, and the other end of the fourteenth resistor is electrically connected to the positive electrode of the external power supply; the fifth pin of the second single-chip microcomputer is electrically connected to the G port of the second relay, and the G port of the second relay is electrically connected to a selection switch; The second pin of the second single chip microcomputer is electrically connected to a fifteenth resistor, the other end of the fifteenth resistor is electrically connected to the F port of the second relay, and the F port of the second relay is electrically connected to a selection switch.

4. The sampling adaptive circuit according to claim 3, characterized in that: The second relay is provided with at least four circuits, and the other ends of the four circuits are electrically connected to the negative pole of the external power supply; The third circuit is electrically connected to a fifth capacitor, the fourth circuit is electrically connected to a sixth capacitor, the fifth circuit is electrically connected to a third variable resistor, the sixth circuit is electrically connected to a fourth variable resistor, and the fifth capacitor, the sixth capacitor, the third variable resistor, and the fourth variable resistor are connected in parallel.

5. A method for performing wire cutting machining using the sampling adaptive circuit according to claim 3, characterized in that: The process includes the following: S1, the fifth pin of the first single-chip computer is point A, and the fourth pin is point B. Points A and B are the acquisition terminals for measuring the machining status of the machine tool; S2. According to different processing power supply voltages, different circuits are selected by switching the selection switch on the first relay to achieve different voltage division ratios, thereby changing the voltage at point C; The voltage at point S3 and point C is isolated through the amplifier into a linear optocoupler to obtain the voltage at point D. The voltage at point S4 and point D is amplified by the first transistor to obtain the voltage at point E. After the voltage at point S5 and point E enters the second single-chip microcomputer, different circuits are selected by switching the second relay selection switch according to different processing materials, thereby changing the resistance value and capacitance input value of points G and F, and then changing the RC input value of the second single-chip microcomputer, thereby changing the proportional relationship between the output frequency at point H and the input voltage at point E; The output frequencies of points S6 and H are amplified by the second transistor to obtain the output frequency of point I. Point I is electrically connected to the driver to control the walking speed of the corresponding motor.

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