Control circuit of automatic feeding magnetic seat drilling machine

Abstract

The utility model discloses a control circuit of an automatic feeding magnetic seat drilling machine. The control circuit comprises a power supply module, a magnetic seat power supply module, a motor switch self-locking module, a main motor overcurrent protection module, a feeding motor control module, a travel switch control module, a feeding motor overcurrent protection module and a main motor drilling back-off module, the power supply module supplies power to the control circuit of the automatic feeding magnetic seat drilling machine and is connected to the magnetic seat power supply module, the motor switch self-locking module, the main motor overcurrent protection module, the feeding motor control module, the travel switch control module, the feeding motor overcurrent protection module and the main motor drilling back-off module; the magnetic seat U24 is connected to the magnetic seat power supply module, the main motor M1 is connected to the main motor overcurrent protection module and the main motor overcurrent protection module, and the feed motor M2 is connected to the feed motor control module. According to the control circuit of the automatic feeding magnetic seat drilling machine, automatic feeding drilling and automatic retreating of the magnetic seat drilling machine can be achieved.

Description

Technical Field

[0001] The utility model relates to a control circuit for an automatic feeding magnetic base drill. Background Art

[0002] When the magnetic base drill is powered on, magnetic force is generated through the electromagnetic effect, enabling it to adsorb on structural components such as steel plates, playing a role in fixing the machine. Therefore, it has high operation convenience and saves the operation intensity of users. With the development of magnetic base drills, the types of drills are also increasing. However, currently, most domestic magnetic base drills need to complete feeding by manually operating the feeding handle during work, which greatly increases the labor intensity of the users. Content of the Utility Model

[0003] The utility model provides a control circuit for an automatic feeding magnetic base drill to solve the above-mentioned technical problems, and specifically adopts the following technical solutions:

[0004] A control circuit for an automatic feeding magnetic base drill is used to control the main motor M1, the feeding motor M2, and the magnetic base U24. The control circuit for the automatic feeding magnetic base drill includes: a power supply module, a magnetic base power supply module, a motor switch self-locking module, an overcurrent protection module for the main motor, a feeding motor control module, a travel switch control module, an overcurrent protection module for the feeding motor, and a main motor drill-through and retraction module;

[0005] The power supply module supplies power to the control circuit for the automatic feeding magnetic base drill, and the power supply module is connected to the magnetic base power supply module, the motor switch self-locking module, the overcurrent protection module for the main motor, the feeding motor control module, the travel switch control module, the overcurrent protection module for the feeding motor, and the main motor drill-through and retraction module;

[0006] The magnetic base U24 is connected to the magnetic base power supply module, the main motor M1 is connected to the overcurrent protection module for the main motor and the overcurrent protection module for the main motor, and the feeding motor M2 is connected to the feeding motor control module.

[0007] The power supply module includes a power supply U2, with an input of 220VAC. The 220V phase line L and the neutral line N are respectively connected to the 1st pin and the 2nd pin of the power supply U2. The 3rd pin and the 4th pin of the power supply U2 output 24V DC voltage, where the 3rd pin is the reference low level.

[0008] Further, the magnetic base power supply module includes: diode D5, diode D8, diode D6, rectifier bridge D9, diode D7, fuse F2;

[0009] The positive pole of the magnetic base U24 is connected to the negative pole of the diode D5. The negative pole of the diode D5 is connected to the negative pole of the diode D8. The positive pole of the diode D5 is connected to the negative pole of the diode D6. The positive pole of the diode D6 is connected to the positive pole of the rectifier bridge D9 and the negative pole of the diode D7. The positive pole of the diode D7 is connected to the power supply phase line L through the fuse F2. The negative pole of the magnetic base U24 is connected to the positive pole of the diode D8 and the negative pole of the rectifier bridge D9.

[0010] Further, the motor switch self-locking module includes: optocoupler U25, resistor R57, motor switch S1, resistor R55, resistor R56, motor switch S2, triode Q7, resistor R54, resistor R45, resistor R46, relay CN3, diode D4, triode Q6, resistor R40, capacitor C4, resistor R23, diode D2, triode Q11, resistor R16, optocoupler U14, diode D3, triode Q5, resistor R23, triode Q5, triode Q2, resistor R24, triode Q1, resistor R13, resistor R24, resistor R12, triode Q13, resistor R17, triode Q12, diode D1, resistor R11, interface U8, momentary switch S3, momentary switch S4, optocoupler U9 and optocoupler U14;

[0011] Pin 1 of optocoupler U25 is connected to the positive pole of rectifier bridge D9 via resistor R57. Pin 2 of optocoupler U25 is connected to the negative pole of diode D5. One end of resistor R56 is connected to 24VDC, and the other end is connected to pin 2 of motor switch S1. Pin 1 of motor switch S1 is connected to pin 4 of optocoupler U25, resistors R55, R56, and pin 2 of motor switch S2. Pin 1 of motor switch S2 is connected to the power ground. The emitter of triode Q7 is connected to 24VDC. The collector of triode Q7 is grounded via resistor R55 and resistor R54. The base of triode Q7 is connected to 24VDC via resistor R45 and to the negative pole of relay CN3 coil via resistor R46. The positive pole of relay CN3 coil is connected to 24VDC. The negative pole of relay CN3 coil is connected to 24VDC via diode D4. The negative pole of relay CN3 coil is connected to the collector of triode Q6. The base of triode Q6 is grounded via resistor R40 and connected to pin 3 of optocoupler U25. Capacitor C4 is in parallel with resistor R40. The emitter of triode Q6 is grounded. The negative pole of relay CN3 coil is connected to the base of triode Q11 via resistor R23 and diode D2. The collector of triode Q11 is connected to 24VDC via resistor R16. The emitter of triode Q11 is connected to pin 1 of optocoupler U14. The negative pole of relay CN3 coil is connected to the base of triode Q5 via resistor R23 and diode D3. The collector of triode Q5 is connected to the emitter of triode Q2. The emitter of triode Q5 is grounded. The negative pole of relay CN3 coil is connected to the base of triode Q1 via resistor R24 and diode D4. The collector of triode Q5 is connected to pin 6 of feed motor M2. The base of triode Q2 is connected to 24VDC via resistor R13. The emitter of triode Q1 is connected to 24VDC via resistor R16. A resistor R24 is in parallel between the base and emitter of triode Q1. The collector of triode Q1 is connected to the base of triode Q13 via resistor R12 and grounded via resistor R17. The collector of triode Q13 is connected to pin 6 of optocoupler U14 and pin 3 of feed motor M2. The emitter of triode Q13 is grounded. The collector and emitter of triode Q12 are respectively connected to the base and ground of triode Q13. The base of triode Q12 is grounded via diode D1 and resistor R11. The positive pole of diode D1 is connected to pin 3 of interface U8. One end of the jog switches S3 and S4 is respectively connected to the base of triode Q2 and pin 3 of optocoupler U9. Pin 1 of optocoupler U9 is connected to pin 3 of optocoupler U14. Pin 4 of optocoupler U9 is grounded. Pin 4 of optocoupler U14 is grounded. Pin 1 of feed motor M2 is connected to 24VDC. Pin 2 is grounded via sampling resistor R23. Pin 4 is connected to pin 4 of interface U8. Pin 5 is floating.

[0012] Further, the feed motor M2 is a brushless DC motor.

[0013] Further, the overcurrent protection module of the main motor includes: current transformer CN2, diode D13, resistor R2, comparator U1, electrolytic capacitor C28, resistor R7, resistor R6, diode D20, resistor R27, capacitor C23, capacitor C24, resistor R28, triode Q3, and optocoupler U4;

[0014] One end of the current transformer CN2 is connected to the power ground, and the other end is connected to the positive electrode of the diode D13. The negative electrode of the diode D13 is connected to the 5th pin of the comparator U1 through the resistor R2. The positive electrode of the electrolytic capacitor C28 is connected to the positive electrode of the diode D13. The resistor R1 is connected in parallel with the electrolytic capacitor C28. The 6th pin of the comparator U1 is connected to 5VDC through the resistor R7 and grounded through the resistor R6 respectively. The 7th pin of the comparator U1 is connected to the resistor R27 through the diode D20. The other end of the resistor R27 is connected to the positive electrode of the capacitor C23 and the capacitor C24. The negative electrode of the capacitor C24 is grounded. The resistor R28 is connected in parallel with the capacitor C24. The negative electrode of the capacitor C23 is connected to the base of the triode Q3. The emitter of the triode Q3 is grounded, and the collector is connected to the 3rd pin of the optocoupler U4.

[0015] Further, the travel switch control module includes: proximity switch U6, resistor R33, triode Q4, resistor R36, proximity switch U7, optocoupler U21, resistor R35, triode U18, diode D23, diode D19, triode U19, resistor R37, resistor R47, diode D22, resistor R38, thyristor Q9, optocoupler U12, resistor R51, diode D27, relay CM3, diode D24, and resistor R42;

[0016] The 1st and 3rd pins of the proximity switch U6 are grounded and connected to 12VDC respectively. The 2nd pin of the proximity switch U6 is connected to 12VDC through the resistor R33. The 2nd pin of the proximity switch U6 is connected to the base of the triode Q4. The collector of the triode Q4 is connected to 12VDC. The emitter of the triode Q4 is connected to the 2nd pin of the proximity switch U7 and the 4th pin of the optocoupler U21 through the resistor R36 respectively. The 2nd pin of the proximity switch U6 is connected to the base of the triode U18 through the resistor R35. The emitter of the triode U18 is connected to 12VDC. The collector of the triode U18 is connected to the negative electrode of the diode D19 through the diode D23. The 1st and 2nd pins of the proximity switch U6 are grounded and connected to 12VDC respectively. The base of the triode U19 is connected to the 2nd pin of the proximity switch U7 and 12VDC through the resistor R37 and the resistor R47 respectively. The collector of the triode U19 is connected to the base of the thyristor Q9 through the diode D22 and the resistor R38. The emitter of the triode U19 is connected to the 4th pin of the optocoupler U21. The 1st and 3rd pins of the optocoupler U12 are connected to 12VDC and the positive electrode of the thyristor Q9 respectively. The 2nd pin of the optocoupler U21 is connected to the negative electrode of the relay CM3 through the resistor R51 and the diode D27. The negative electrode of the thyristor Q9 is connected to the forward and reverse control terminal ZH of the brushless DC motor through the diode D24 and the resistor R42.

[0017] Furthermore, the feed motor overcurrent protection module includes: resistor R8, resistor R9, amplifier U12, resistor R10, diode D18, resistor R20, comparator U13, resistor R26, and resistor R25;

[0018] The feed motor M2 is connected to the 3rd pin of the amplifier U12 via the resistor R8. The 2nd pin of the amplifier U12 is grounded via the resistor R9. The resistor R10 is connected in parallel between the 2nd and 1st pins of the amplifier U12. The 1st pin of the amplifier U12 is connected to the 3rd pin of the comparator U13 via the diode D18 and the resistor R20. The 2nd pin of the U13 is connected to the 5VDC via the resistor R26 and grounded via the resistor R25 respectively. The 1st pin of the comparator U13 is connected to the negative electrode of the diode D20 via the diode D19.

[0019] Furthermore, the main motor drilling-through and retracting module includes: mutual inductor CN2, diode D13, resistor R2, amplifier U1, resistor R4, resistor R3, resistor R14, comparator U3, resistor R15, electrolytic capacitor C21, potentiometer R50, diode D25, diode D24, diode D26, resistor R43, triode U22, electronic switch U11, resistor R53, resistor R52, diode D28, resistor R44, resistor R41, signal converter U17, resistor R48, DC brushless motor M4, comparator U12, diode D17, resistor R19, resistor R22, potentiometer R49, resistor R30, diode D21, and thyristor Q10;

[0020] Pin 2 of the mutual inductor CN2 is connected to pin 3 of the amplifier U1 via the diode D13 and the resistor R2. Pin 2 of the amplifier U1 is grounded via the resistor R4. A resistor R3 is connected in series between pin 1 and pin 2 of the amplifier U1. Pin 1 of the amplifier U1 is connected to pin 2 of the comparator U3 via the resistor R14. Pin 3 of the comparator U3 is grounded via the resistor R15, and the resistor R15 is in parallel with the electrolytic capacitor C21. Pin 3 of the comparator U3 is connected to the sliding end of the potentiometer R50. One end of the potentiometer R50 is connected to 5VDC, and the other end is grounded. Pin 1 of the comparator U3 is connected to the negative electrode of the diode D24 via the diode D25 and to one end of the resistor R43 via the diode D26. The other end of the resistor R43 is connected to the base of the triode U22. The emitter of the triode U22 is connected to 5VDC, the collector of the triode U22 is connected to pin 1 of the electronic switch U11, a resistor R53 is connected in parallel between the base and the emitter of the triode U22, and the base of the triode U22 is connected to the negative electrode of the relay CN3 via the resistor R52 and the diode D28. Pin 1 of the electronic switch U11 is grounded via the resistor R44. Pins 2, 3, 4, and 6 of the electronic switch U11 are connected to 5VDC, ground, 5VDC, and 1.2VDC respectively. Pin 5 of the electronic switch U11 is connected to pin 3 of the signal converter U17 via the resistor R41. Pins 8 and 5 of the signal converter U17 are connected to 5VDC and ground respectively. Pin 6 of the signal converter U17 is connected to the speed control interface M4 of the feed motor M2 via the resistor R48. Pin 1 of the comparator U12 is connected to pin 5 of the comparator U12 via the diode D17 and the resistor R19. Pin 5 of the comparator U12 is grounded via the resistor R22. Pin 6 of the comparator U12 is connected to the sliding end of the potentiometer R49. One end of the potentiometer R49 is connected to 5VDC, and the other end is grounded. Pin 7 of the comparator U12 is connected to the base of the thyristor Q10 via the resistor R30 and the diode D21. The negative electrode of the thyristor Q10 is connected to pin 8 of the comparator U3.

[0021] The beneficial effect of the present utility model lies in that the provided automatic feed magnetic base drill control circuit can realize the automatic feed drilling and automatic retraction of the magnetic base drill. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a schematic diagram of a part of the automatic feed magnetic base drill control circuit of the present utility model;

[0024] Figure 2 It is a schematic diagram of another part of the automatic feed magnetic base drill control circuit of the present utility model. Detailed implementation manners

[0025] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application and should not be construed as a limitation to the present application.

[0026] The present application discloses a control circuit for an automatic feed magnetic base drill, which is used to control a main motor M1, a feed motor M2, and a magnetic base U24. The control circuit for the automatic feed magnetic base drill includes: a power supply module, a magnetic base power supply module, a motor switch self-locking module, an overcurrent protection module for the main motor, a feed motor control module, a travel switch control module, an overcurrent protection module for the feed motor, and a main motor drill-through and retraction module. The power supply module supplies power to the control circuit for the automatic feed magnetic base drill, and the power supply module is connected to the magnetic base power supply module, the motor switch self-locking module, the overcurrent protection module for the main motor, the feed motor control module, the travel switch control module, the overcurrent protection module for the feed motor, and the main motor drill-through and retraction module. The magnetic base U24 is connected to the magnetic base power supply module, the main motor M1 is connected to the overcurrent protection module for the main motor and the overcurrent protection module for the main motor, and the feed motor M2 is connected to the feed motor control module.

[0027] Specifically, as Figure 1 and 2 shown, the power supply module includes a power supply U2. In the implementation manner of the present application, the input is 220VAC, and the 220V phase line L and the neutral line N are respectively connected to the 1st pin and the 2nd pin of the power supply U2. The 3rd pin and the 4th pin of the power supply U2 output a 24V DC voltage. And, the 3rd pin is the reference low level.

[0028] In the implementation manner of the present application, the magnetic base power supply module includes: a diode D5, a diode D8, a diode D6, a rectifier bridge D9, a diode D7, and a fuse F2.

[0029] Specifically, the positive pole of the magnetic base U24 is connected to the negative pole of the diode D5, the negative pole of the diode D5 is connected to the negative pole of the diode D8, the positive pole of the diode D5 is connected to the negative pole of the diode D6, the positive pole of the diode D6 is connected to the positive pole of the rectifier bridge D9 and the negative pole of the diode D7, the positive pole of the diode D7 is connected to the power supply phase line L through the fuse F2, and the negative pole of the magnetic base U24 is connected to the positive pole of the diode D8 and the negative pole of the rectifier bridge D9.

[0030] After the mains voltage of 220V is rectified by the rectifier bridge D9 after power-on, a pulsed voltage is output to supply power to the magnetic base coil, enabling the magnetic base U24 to adsorb on magnetic metals such as iron plates. Optionally, when the control circuit of the automatic-feed magnetic base drill is powered on, the magnetic base U24 can be controlled to work in a 50% magnetic state, and the electric drill can be held on the iron block. When the drill is working officially, the magnetic base U24 can be controlled to be in a 100% magnetic state, making the stability during the working process stronger. It can also be the default 100% magnetic state.

[0031] In the implementation manner of the present application, the motor switch self-locking module includes: optocoupler U25, resistor R57, motor switch S1, resistor R55, resistor R56, motor switch S2, triode Q7, resistor R54, resistor R45, resistor R46, relay CN3, diode D4, triode Q6, resistor R40, capacitor C4, resistor R23, diode D2, triode Q11, resistor R16, optocoupler U14, diode D3, triode Q5, resistor R23, triode Q5, triode Q2, resistor R24, triode Q1, resistor R13, resistor R24, resistor R12, triode Q13, resistor R17, triode Q12, diode D1, resistor R11, interface U8, momentary switch S3, momentary switch S4, optocoupler U9, and optocoupler U14.

[0032] Specifically, pin 1 of optocoupler U25 is connected to the positive pole of rectifier bridge D9 via resistor R57. Pin 2 of optocoupler U25 is connected to the negative pole of diode D5. Optocoupler U25 operates with the conduction of magnetic base U24, associating magnetic base U24 with the motor switch self-locking module. One end of resistor R56 is connected to 24VDC, and the other end is connected to pin 2 of motor switch S1. Pin 1 of motor switch S1 is connected to pin 4 of optocoupler U25, resistors R55, R56, and pin 2 of motor switch S2. Pin 1 of motor switch S2 is connected to the power ground. The emitter of triode Q7 is connected to 24VDC. The collector of triode Q7 is grounded via resistor R55 and resistor R54. The base of triode Q7 is connected to 24VDC via resistor R45 and the negative pole of relay CN3 coil via resistor R46. The positive pole of relay CN3 coil is connected to 24VDC. The negative pole of relay CN3 coil is connected to 24VDC via diode D4. The negative pole of relay CN3 coil is connected to the collector of triode Q6. The base of triode Q6 is grounded via resistor R40 and pin 3 of optocoupler U25. Capacitor C4 is in parallel with resistor R40. The emitter of triode Q6 is grounded. The negative pole of relay CN3 coil is connected to the base of triode Q11 via resistor R23 and diode D2. The collector of triode Q11 is connected to 24VDC via resistor R16. The emitter of triode Q11 is connected to pin 1 of optocoupler U14. The negative pole of relay CN3 coil is connected to the base of triode Q5 via resistor R23 and diode D3. The collector of triode Q5 is connected to the emitter of triode Q2. The emitter of triode Q5 is grounded. The negative pole of relay CN3 coil is connected to the base of triode Q1 via resistor R24 and diode D4. The collector of triode Q5 is connected to pin 6 of feed motor M2. The base of triode Q2 is connected to 24VDC via resistor R13. The emitter of triode Q1 is connected to 24VDC via resistor R16. A resistor R24 is in parallel between the base and emitter of triode Q1. The collector of triode Q1 is connected to the base of triode Q13 via resistor R12 and grounded via resistor R17. The collector of triode Q13 is connected to pin 6 of optocoupler U14 and pin 3 of feed motor M2. The emitter of triode Q13 is grounded. The collector and emitter of triode Q12 are respectively connected to the base and ground of triode Q13. The base of triode Q12 is grounded via diode D1 and resistor R11. The positive pole of diode D1 is connected to pin 3 of interface U8. One end of momentary switches S3 and S4 is respectively connected to the base of triode Q2 and pin 3 of optocoupler U9. Pin 1 of optocoupler U9 is connected to pin 3 of optocoupler U14. Pin 4 of optocoupler U9 is grounded. Pin 4 of optocoupler U14 is grounded. Pin 1 of feed motor M2 is connected to 24VDC. Pin 2 is grounded via sampling resistor R23. Pin 4 is connected to pin 4 of interface U8. Pin 5 is left floating. In the embodiment of the present application, feed motor M2 is a brushless DC motor.

[0033] When the motor switch S1 is closed, the pin 1 of S1 is at high voltage. At this time, the optocoupler U25 conducts, so the base of the triode Q6 is at high voltage, the triode Q6 conducts, the relay CN3 closes, the base of Q7 is at low voltage, the triode Q7 conducts, 24VDC is divided by the resistor R55 and the motor R54, and the pin 1 of S1 has high voltage to maintain, ensuring that the relay is always triggered and conducts after the motor switch S1 is disconnected.

[0034] In an embodiment of the present application, the main motor overcurrent protection module includes: the current transformer CN2, the diode D13, the resistor R2, the comparator U1, the electrolytic capacitor C28, the resistor R7, the resistor R6, the diode D20, the resistor R27, the capacitor C23, the capacitor C24, the resistor R28, the triode Q3 and the optocoupler U4.

[0035] Specifically, one end of the current transformer CN2 is connected to the power ground, and the other end is connected to the positive pole of the diode D13. The negative pole of the diode D13 is connected to the 5th pin of the comparator U1 through the resistor R2. The positive pole of the electrolytic capacitor C28 is connected to the positive pole of the diode D13. The resistor R1 is connected in parallel with the electrolytic capacitor C28. The 6th pin of the comparator U1 is connected to 5VDC through the resistor R7 and grounded through the resistor R6 respectively. The 7th pin of the comparator U1 is connected to the resistor R27 through the diode D20. The other end of the resistor R27 is connected to the positive pole of the capacitor C23 and the capacitor C24. The negative pole of the capacitor C24 is grounded. The resistor R28 is connected in parallel with the capacitor C24. The negative pole of the capacitor C23 is connected to the base of the triode Q3. The emitter of the triode Q3 is grounded, and the collector is connected to the 3rd pin of the optocoupler U4.

[0036] When the current transformer CN2 senses the current of the main motor M1, the induced current at its output end changes linearly with the change of the main motor current. The resistor R1 converts the induced current into an induced voltage and compares it through the comparator U1. When this voltage exceeds the set value, the 7th pin of the output end of the comparator U1 outputs a high voltage to trigger the triode Q3 to generate a pulse, so that the motor self-locking module is disconnected and the motor M1 stops running. The main motor overcurrent protection module of the present application accurately detects the motor current through the current transformer and has the advantage of high protection accuracy compared with the temperature control type overload protector.

[0037] In an embodiment of the present application, the travel switch control module includes: the proximity switch U6, the resistor R33, the triode Q4, the resistor R36, the proximity switch U7, the optocoupler U21, the resistor R35, the triode U18, the diode D23, the diode D19, the triode U19, the resistor R37, the resistor R47, the diode D22, the resistor R38, the thyristor Q9, the optocoupler U12, the resistor R51, the diode D27, the relay CM3, the diode D24 and the resistor R42.

[0038] Pin 1 and pin 3 of proximity switch U6 are grounded and connected to 12VDC respectively. Pin 2 of proximity switch U6 is connected to 12VDC via resistor R33. Pin 2 of proximity switch U6 is connected to the base of triode Q4. The collector of triode Q4 is connected to 12VDC. The emitter of triode Q4 is connected to pin 2 of proximity switch U7 and pin 4 of optocoupler U21 via resistor R36 respectively. Pin 2 of proximity switch U6 is connected to the base of triode U18 via resistor R35. The emitter of triode U18 is connected to 12VDC. The collector of triode U18 is connected to the negative pole of diode D19 through diode D23. Pin 1 and pin 2 of proximity switch U6 are grounded and connected to 12VDC respectively. The base of triode U19 is connected to pin 2 of proximity switch U7 and 12VDC via resistor R37 and resistor R47 respectively. The collector of triode U19 is connected to the base of thyristor Q9 through diode D22 and resistor R38. The emitter of triode U19 is connected to pin 4 of optocoupler U21. Pin 1 and pin 3 of optocoupler U12 are connected to 12VDC and the positive pole of thyristor Q9 respectively. Pin 2 of optocoupler U21 is connected to the negative pole of relay CM3 through resistor R51 and diode D27. The negative pole of thyristor Q9 is connected to the forward and reverse control terminal ZH of the brushless DC motor through diode D24 and resistor R42.

[0039] When proximity switch U7 is triggered, pin 2 of proximity switch U7 outputs a low voltage, turning on triode U19, thus turning on thyristor Q9. At this time, ZH changes from low level to high level, and the brushless DC motor starts to reverse and retreat. When it returns to the initial position, proximity switch U6 is triggered, and its pin 2 outputs a low level, causing triode Q4 to turn off and thyristor Q9 to turn off. The reverse signal of the feed motor is reset. At the same time, pin 2 of proximity switch U6 outputs a low level, turning on triode U18, thus triggering the shutdown of main motor M1.

[0040] In the embodiment of the present application, the feed motor overcurrent protection module includes: resistor R8, resistor R9, amplifier U12, resistor R10, diode D18, resistor R20, comparator U13, resistor R26 and resistor R25.

[0041] Feed motor M2 is connected to pin 3 of amplifier U12 via resistor R8. Pin 2 of amplifier U12 is grounded via resistor R9. Resistor R10 is connected in parallel between pin 2 and pin 1 of amplifier U12. Pin 1 of amplifier U12 is connected to pin 3 of comparator U13 through diode D18 and resistor R20. Pin 2 of U13 is connected to 5VDC and resistor R25 is grounded via resistor R26 respectively. Pin 1 of comparator U13 is connected to the negative pole of diode D20 through diode D19.

[0042] Specifically, the induced current value of the feed motor M2 is amplified by the amplifier U12. When the induced current increases to the set value, the comparator U13 outputs a high voltage to the capacitor C23 at pin 1, forming a pulse, briefly turning on the triode Q3, and disconnecting the motors M1 and M2. The overcurrent protection module of the feed motor in this application generates a pulse signal model through the characteristics of triodes and capacitor components, and has the advantages of simple control and low interference level.

[0043] In an embodiment of this application, the main motor drilling and retracting module includes: the mutual inductor CN2, the diode D13, the resistor R2, the amplifier U1, the resistor R4, the resistor R3, the resistor R14, the comparator U3, the resistor R15, the electrolytic capacitor C21, the potentiometer R50, the diode D25, the diode D24, the diode D26, the resistor R43, the triode U22, the electronic switch U11, the resistor R53, the resistor R52, the diode D28, the resistor R44, the resistor R41, the signal converter U17, the resistor R48, the DC brushless motor M4, the comparator U12, the diode D17, the resistor R19, the resistor R22, the potentiometer R49, the resistor R30, the diode D21, and the thyristor Q10.

[0044] Pin 2 of the mutual inductor CN2 is connected to pin 3 of the amplifier U1 via the diode D13 and the resistor R2. Pin 2 of the amplifier U1 is grounded via the resistor R4. A resistor R3 is connected in series between pins 1 and 2 of the amplifier U1. Pin 1 of the amplifier U1 is connected to pin 2 of the comparator U3 via the resistor R14. Pin 3 of the comparator U3 is grounded via the resistor R15. The resistor R15 is in parallel with the electrolytic capacitor C21. Pin 3 of the comparator U3 is connected to the sliding end of the potentiometer R50. One end of the potentiometer R50 is connected to 5VDC, and the other end is grounded. Pin 1 of the comparator U3 is connected to the negative electrode of the diode D24 via the diode D25 and to one end of the resistor R43 via the diode D26. The other end of the resistor R43 is connected to the base of the triode U22. The emitter of the triode U22 is connected to 5VDC. The collector of the triode U22 is connected to pin 1 of the electronic switch U11. A resistor R53 is connected in parallel between the base and the emitter of the triode U22. The base of the triode U22 is connected to the negative electrode of the relay CN3 via the resistor R52 and the diode D28. Pin 1 of the electronic switch U11 is grounded via the resistor R44. Pins 2, 3, 4, and 6 of the electronic switch U11 are connected to 5VDC, ground, 5VDC, and 1.2VDC respectively. Pin 5 of U11 is connected to pin 3 of the signal converter U17 via the resistor R41. Pins 8 and 5 of the signal converter U17 are connected to 5VDC and ground respectively. Pin 6 of the signal converter U17 is connected to the speed control interface M4 of the DC brushless motor M2 (feed motor M2) via the resistor R48. Pin 1 of the comparator U12 is connected to pin 5 of the comparator U12 via the diode D17 and the resistor R19. Pin 5 of the comparator U12 is grounded via the resistor R22. Pin 6 of the comparator U12 is connected to the sliding end of the potentiometer R49. One end of the potentiometer R49 is connected to 5VDC, and the other end is grounded. Pin 7 of the comparator U12 is connected to the base of the thyristor Q10 via the resistor R30 and the diode D21. The negative electrode of the thyristor Q10 is connected to pin 8 of the comparator U3.

[0045] When the main shaft of the drill touches the metal to be cut, the resistance of the feed motor M2 increases, causing the current of the feed motor M2 to increase. Therefore, when the sampled and amplified induced voltage increases to the set value, the output terminal 7 of the comparator U12 outputs a high voltage, triggering the thyristor Q10 and enabling the comparator U3 to operate. At this time, the 2nd pin of the comparator U3 is connected to the induced and amplified voltage of the main motor M1, and the 3rd pin is connected to the set voltage. When the main motor M1 is drilling metal, the induced voltage of the main motor M1 is relatively large, so the voltage at the 2nd pin is greater than the voltage at the 3rd pin, and thus the output terminal 1 pin outputs a low voltage. When the main motor M1 drills through the metal plate, the induced voltage of the main motor M1 decreases. When it drops below the set value, the 1st pin of the comparator U3 outputs a high voltage, triggering the triode U22, causing the feed motor M2 to reverse and drive the main shaft of the drill to retract upward. At the same time, the high voltage output from the 1st pin of U3 conducts the 4th and 5th pins of the electronic switch U11, enabling the signal converter U17 to output a high pulse width modulation pulse, increasing the rotational speed of the feed motor M2. When the main shaft retracts to the topmost position, the proximity switch U6 is triggered, and the motors M1 and M2 stop running. The main motor drilling-through and retracting module of this application switches the feed speed through an electronic switch, with the advantages of small volume, simple and stable control.

[0046] The above shows and describes the basic principles, main features, and advantages of the present utility model. Those skilled in the art should understand that the above embodiments do not limit the present utility model in any form. Any technical solutions obtained by using equivalent replacements or equivalent transformations fall within the protection scope of the present utility model.

Claims

1. An automatic feeding magnetic base drilling rig control circuit, used to control the main motor M1, feed motor M2 and magnetic base U24, characterized in that: The automatic feeding magnetic base drilling rig control circuit includes: power supply module, magnetic base power supply module, motor switch self-locking module, main motor overcurrent protection module, feeding motor control module, travel switch control module, feeding motor overcurrent protection module and main motor drilling and retraction module; The power module supplies power to the automatic feeding magnetic base drilling rig control circuit, and the power module is connected to the magnetic base power supply module, the motor switch self-locking module, the main motor overcurrent protection module, the feed motor control module, the travel switch control module, the feed motor overcurrent protection module and the main motor drilling and retraction module; The magnetic base U24 is connected to the magnetic base power supply module, the main motor M1 is connected to the main motor overcurrent protection module and the main motor overcurrent protection module, and the feed motor M2 is connected to the feed motor control module; The power module includes a power supply U2, the input is 220VAC, the 220V phase line L and the neutral line N are connected to pin 1 and pin 2 of the power supply U2 respectively, and pins 3 and 4 of the power supply U2 output 24V DC voltage, where pin 3 is a reference low level.

2. The automatic feeding magnetic drilling rig control circuit according to claim 1 is characterized in that: The magnetic base power supply module includes: diode D5, diode D8, diode D6, rectifier bridge D9, diode D7, fuse F2; The positive pole of the magnetic base U24 is connected to the negative pole of the diode D5, the negative pole of the diode D5 is connected to the negative pole of the diode D8, the positive pole of the diode D5 is connected to the negative pole of the diode D6, the positive pole of the diode D6 is connected to the positive pole of the rectifier bridge D9 and the negative pole of the diode D7, the positive pole of the diode D7 is connected to the power phase line L through the fuse F2, and the negative pole of the magnetic base U24 is connected to the positive pole of the diode D8 and the negative pole of the rectifier bridge D9.

3. The automatic feeding magnetic drilling rig control circuit according to claim 2 is characterized in that: The motor switch self-locking module includes: optocoupler U25, resistor R57, motor switch S1, resistor R55, resistor R56, motor switch S2, transistor Q7, resistor R54, resistor R45, resistor R46, relay CN3, diode D4, transistor Q6, resistor R40, capacitor C4, resistor R23, diode D2, transistor Q11, resistor R16, optocoupler U14, diode D3, transistor Q5, resistor R23, transistor Q5, transistor Q2, resistor R24, transistor Q1, resistor R13, resistor R24, resistor R12, transistor Q13, resistor R17, transistor Q12, diode D1, resistor R11, interface U8, inching switch S3, inching switch S4, optocoupler U9 and optocoupler U14; Pin 1 of optocoupler U25 is connected to the positive electrode of rectifier bridge D9 via resistor R57, pin 2 of optocoupler U25 is connected to the negative electrode of diode D5, one end of resistor R56 is connected to 24VDC, and the other end is connected to pin 2 of motor switch S1, pin 1 of motor switch S1 is connected to pin 4 of optocoupler U25 and resistors R55, R56, and pin 2 of motor switch S2, pin 1 of motor switch S2 is connected to power ground, the emitter of transistor Q7 is connected to 24VDC, the collector of transistor Q7 is grounded via resistor R55 and resistor R54, the base of transistor Q7 is connected to 24VDC via resistor R45 and to the negative electrode of relay CN3 coil via resistor R46, relay CN The positive pole of coil 3 is connected to 24VDC, the negative pole of relay CN3 coil is connected to 24VDC via diode D4, the negative pole of relay CN3 coil is connected to the collector of transistor Q6, the base of transistor Q6 is connected to ground and pin 3 of optocoupler U25 via resistor R40, capacitor C4 is connected in parallel with resistor R40, the emitter of transistor Q6 is grounded, the negative pole of relay CN3 coil is connected to the base of transistor Q11 via resistor R23 and diode D2, the collector of transistor Q11 is connected to 24VDC via resistor R16, the emitter of transistor Q11 is connected to pin 1 of optocoupler U14, the negative pole of relay CN3 coil is connected to transistor Q via resistor R23 and diode D3 5, the collector of transistor Q5 is connected to the emitter of transistor Q2, the emitter of transistor Q5 is grounded, the negative pole of relay CN3 coil is connected to the base of transistor Q1 via resistor R24 ​​and diode D4, the collector of transistor Q5 is connected to pin 6 of feed motor M2, the base of transistor Q2 is connected to 24VDC via resistor R13, the emitter of transistor Q1 is connected to 24VDC via resistor R16, resistor R24 ​​is connected in parallel between the base and emitter of transistor Q1, the collector of transistor Q1 is connected to the base of transistor Q13 via resistor R12 and grounded via resistor R17, the collector of transistor Q13 is connected to pin 6 of optocoupler U14 And pin 3 of the feed motor M2, the emitter of the transistor Q13 is grounded, the collector and emitter of the transistor Q12 are connected to the base of the transistor Q13 and the ground respectively, the base of the transistor Q12 is grounded via the diode D1 and the resistor R11, the positive pole of the diode D1 is connected to pin 3 of the interface U8, one end of the momentary switches S3 and S4 are connected to the base of the transistor Q2 and the pin 3 of the optocoupler U9 respectively, the pin 1 of the optocoupler U9 is connected to the pin 3 of the optocoupler U14, the pin 4 of the optocoupler U9 is grounded, the pin 4 of the optocoupler U14 is grounded, the pin 1 of the feed motor M2 is connected to 24VDC, the pin 2 is grounded via the sampling resistor R23, the pin 4 is connected to the pin 4 of the interface U8, and the pin 5 is left floating.

4. The automatic feeding magnetic drilling rig control circuit according to claim 3 is characterized in that: The feed motor M2 is a brushless DC motor.

5. The automatic feeding magnetic drilling rig control circuit according to claim 3 is characterized in that: The main motor overcurrent protection module includes: mutual inductor CN2, diode D13, resistor R2, comparator U1, electrolytic capacitor C28, resistor R7, resistor R6, diode D20, resistor R27, capacitor C23, capacitor C24, resistor R28, transistor Q3 and optocoupler U4; One end of the mutual inductor CN2 is connected to the power ground, and the other end is connected to the positive electrode of the diode D13. The negative electrode of the diode D13 is connected to the 5th pin of the comparator U1 through the resistor R2. The positive electrode of the electrolytic capacitor C28 is connected to the positive electrode of the diode D13. The resistor R1 is connected in parallel with the electrolytic capacitor C28. The 6th pin of the comparator U1 is connected to 5VDC and grounded through the resistor R7 and the resistor R6 respectively. The 7th pin of the comparator U1 is connected to the resistor R27 through the diode D20. The other end of the resistor R27 is connected to the positive electrode of the capacitor C23 and the capacitor C24. The negative electrode of the capacitor C24 is grounded. The resistor R28 is connected in parallel with the capacitor C24. The negative electrode of the capacitor C23 is connected to the base of the transistor Q3. The emitter of the transistor Q3 is grounded, and the collector is connected to the 3rd pin of the optocoupler U4.

6. The automatic feeding magnetic drilling rig control circuit according to claim 5 is characterized in that: The travel switch control module includes: proximity switch U6, resistor R33, transistor Q4, resistor R36, proximity switch U7, optocoupler U21, resistor R35, transistor U18, diode D23, diode D19, transistor U19, resistor R37, resistor R47, diode D22, resistor R38, thyristor Q9, optocoupler U12, resistor R51, diode D27, relay CM3, diode D24 and resistor R42; Pin 1 and pin 3 of proximity switch U6 are connected to ground and 12VDC respectively, pin 2 of proximity switch U6 is connected to 12VDC via resistor R33, pin 2 of proximity switch U6 is connected to the base of transistor Q4, the collector of transistor Q4 is connected to 12VDC, the emitter of transistor Q4 is connected to pin 2 of proximity switch U7 and pin 4 of optocoupler U21 via resistor R36 respectively, pin 2 of proximity switch U6 is connected to the base of transistor U18 via resistor R35, the emitter of transistor U18 is connected to 12VDC, the collector of transistor U18 is connected to the cathode of diode D19 via diode D23, and pin 1 and pin 2 of proximity switch U6 are connected to the base of transistor U18 via resistor R35, the emitter of transistor U18 is connected to 12VDC, the collector of transistor U18 is connected to the cathode of diode D19 via diode D23, and pin 1 and pin 2 of proximity switch U6 are connected to the base of transistor Q4 via resistor R36. They are connected to ground and 12VDC respectively, the base of the transistor U19 is connected to pin 2 of the proximity switch U7 and 12VDC via resistors R37 and R47 respectively, the collector of the transistor U19 is connected to the base of the thyristor Q9 via diode D22 and resistor R38, the emitter of the transistor U19 is connected to pin 4 of the optocoupler U21, pins 1 and 3 of the optocoupler U12 are connected to 12VDC and the positive electrode of the thyristor Q9 respectively, pin 2 of the optocoupler U21 is connected to the negative electrode of the relay CM3 via resistor R51 and diode D27, and the negative electrode of the thyristor Q9 is connected to the forward and reverse control terminal ZH of the brushless DC motor via diode D24 and resistor R42.

7. The automatic feeding magnetic drilling rig control circuit according to claim 6 is characterized in that: The feed motor overcurrent protection module includes: resistor R8, resistor R9, amplifier U12, resistor R10, diode D18, resistor R20, comparator U13, resistor R26 and resistor R25; The feed motor M2 is connected to the pin 3 of the amplifier U12 via the resistor R8, the pin 2 of the amplifier U12 is grounded via the resistor R9, the pin 2 and pin 1 of the amplifier U12 are connected in parallel with the resistor R10, the pin 1 of the amplifier U12 is connected to the pin 3 of the comparator U13 via the diode D18 and the resistor R20, the pin 2 of U13 is connected to 5VDC and the ground via the resistor R25 respectively, and the pin 1 of the comparator U13 is connected to the cathode of the diode D20 via the diode D19.

8. The automatic feeding magnetic drilling rig control circuit according to claim 7 is characterized in that: The main motor drilling and retraction module includes: mutual inductor CN2, diode D13, resistor R2, amplifier U1, resistor R4, resistor R3, resistor R14, comparator U3, resistor R15, electrolytic capacitor C21, potentiometer R50, diode D25, diode D24, diode D26, resistor R43, transistor U22, electronic switch U11, resistor R53, resistor R52, diode D28, resistor R44, resistor R41, signal converter U17, resistor R48, brushless DC motor M4, comparator U12, diode D17, resistor R19, resistor R22, potentiometer R49, resistor R30, diode D21 and thyristor Q10; The 2nd foot of the mutual inductor CN2 is connected to the 3rd foot of the amplifier U1 through the diode D13 and the resistor R2, the 2nd foot of the amplifier U1 is grounded through the resistor R4, the resistor R3 is connected in series between the 1st foot and the 2nd foot of the amplifier U1, the 1st foot of the amplifier U1 is connected to the 2nd foot of the comparator U3 through the resistor R14; the 3rd foot of the comparator U3 is grounded through the resistor R15, the resistor R15 is connected in parallel with the electrolytic capacitor C21, the 3rd foot of the comparator U3 is connected to the sliding end of the potentiometer R50, the potentiometer R50 is connected in parallel with the electrolytic capacitor C21, the 3rd foot of the comparator U3 is connected to the sliding end of the potentiometer R50, the potentiometer R50 is connected in parallel with the electrolytic capacitor C21, the comparator U3 is connected to the sliding end of the comparator U3 ... The first terminal is connected to 5VDC, and the other terminal is grounded; the 1st pin of the comparator U3 is connected to the cathode of the diode D24 through the diode D25 and to one end of the resistor R43 through the diode D26, the other end of the resistor R43 is connected to the base of the transistor U22, the emitter of the transistor U22 is connected to 5VDC, the collector of the transistor U22 is connected to the 1st pin of the electronic switch U11, the base and emitter of the transistor U22 are connected in parallel with the resistor R53, the base of the transistor U22 is connected via the resistor R52 The diode D28 is connected to the cathode of the relay CN3, the pin 1 of the electronic switch U11 is grounded via the resistor R44, the pins 2, 3, 4, and 6 of the electronic switch U11 are connected to 5VDC, ground, 5VDC, and 1.2VDC respectively, the pin 5 of the electronic switch U11 is connected to the pin 3 of the signal converter U17 via the resistor R41, the pins 8 and 5 of the signal converter U17 are connected to 5VDC and ground respectively, the pin 6 of the signal converter U17 is connected to the feed motor M2 via the resistor R48 Speed ​​control interface M4; Pin 1 of comparator U12 is connected to Pin 5 of comparator U12 via diode D17 and resistor R19, Pin 5 of comparator U12 is grounded via resistor R22, Pin 6 of comparator U12 is connected to the sliding end of potentiometer R49, one end of potentiometer R49 is connected to 5VDC, and the other end is grounded; Pin 7 of comparator U12 is connected to the base of thyristor Q10 via resistor R30 and diode D21, and the negative pole of thyristor Q10 is connected to Pin 8 of comparator U3.

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