Control circuit and control device for preventing adhesion of welding rods of welding machine

Abstract

The utility model discloses a control circuit and a control device for preventing adhesion of welding rods of a welding machine, particularly relates to the technical field of welding machine control, and has the technical key points that the circuit comprises a voltage feedback unit connected with the output end of the welding machine and used for collecting the voltage of the output end of the welding machine; the anti-adhesion control unit is connected with the given input end of the welding machine PI circuit and is used for outputting an anti-adhesion voltage signal to control the current of the welding machine PI circuit; and the anti-sticking signal output unit is connected between the voltage feedback unit and the anti-sticking control unit and is used for outputting an anti-sticking voltage signal based on the voltage signal input by the voltage feedback unit. The voltage feedback unit collects the voltage of the output end of the welding machine, the working state of the welding machine is judged according to the voltage of the output end of the welding machine, the anti-adhesion signal output unit outputs an anti-adhesion voltage signal based on the collected voltage of the output end of the welding machine, and finally the anti-adhesion control unit controls the current of a PI circuit of the welding machine based on the anti-adhesion voltage signal. Therefore, the purpose of preventing welding rod adhesion is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to welding machine control technical field, concretely relates to a control circuit and control device that prevent welding machine electrode from sticking. BACKGROUND

[0002] When welding manual welding, the electrode often sticks to the workpiece and is not easy to pull out, and most welding machines on the market do not have an anti-sticking circuit, so the welding quality of the workpiece is affected and the production efficiency is reduced. At the same time, after the electrode sticks, the output positive and negative terminals of the electric welding machine are short-circuited, the output current of the welding machine is very large, and the welding machine is prone to failure, thereby causing great trouble to the users.

[0003] Therefore, the utility model aims at providing a control circuit and control device that prevent welding machine electrode from sticking to solve the above-mentioned related problems. SUMMARY

[0004] The utility model solves the technical problem that the electrode is prone to stick to the workpiece during welding, thereby affecting the production efficiency, and aims to provide a control circuit and control device that prevent welding machine electrode from sticking. The voltage feedback unit collects the voltage at the output end of the welding machine, and judges the working state of the welding machine according to the voltage at the output end of the welding machine to control the conduction state of the optocoupler. The positive input end voltage of the operational amplifier is controlled by the conduction state of the optocoupler, and the output end voltage of the operational amplifier is controlled by judging the size of the positive input end voltage and the negative input end voltage. Then, the anti-sticking signal output unit outputs the anti-sticking voltage signal according to the output end voltage of the operational amplifier. Finally, the anti-sticking voltage signal is input to the triode to make the triode conductive, and the collector voltage of the triode is clamped to 0V. At this time, the given input end of the welding machine PI circuit is also clamped to 0V, the welding machine has no current voltage output, and the electrode has no current flowing through, so that the electrode can be removed from the workpiece and the sticking is prevented.

[0005] The utility model realizes the following technical scheme:

[0006] A control circuit that prevents welding machine electrode from sticking, the circuit comprises:

[0007] A voltage feedback unit connected to the output end of the welding machine, used for collecting the voltage at the output end of the welding machine;

[0008] An anti-sticking control unit connected to the given input end of the welding machine PI circuit, used for outputting the anti-sticking voltage signal to control the current of the welding machine PI circuit;

[0009] And an anti-sticking signal output unit connected between the voltage feedback unit and the anti-sticking control unit, used for outputting the anti-sticking voltage signal based on the voltage signal input by the voltage feedback unit.

[0010] Further, the welding machine output end comprises a welding machine positive output end and a welding machine negative output end, the voltage feedback unit comprises a first resistor, a second resistor, a third resistor, a first voltage stabilizing diode, a first capacitor, a fourth resistor and an optical coupler; one end of the first resistor and the third resistor connected in series is connected with the welding machine positive output end, the other end of the first resistor and the third resistor connected in series is connected with the cathode of the first voltage stabilizing diode, the anode of the first voltage stabilizing diode is connected with the LED anode of the optical coupler; the LED cathode of the optical coupler is connected with the welding machine negative output end; one end of the second resistor and the first capacitor connected in parallel is connected between the first resistor and the third resistor, the other end of the second resistor and the first capacitor connected in parallel is connected between the LED cathode of the optical coupler and the welding machine negative output end; one end of the fourth resistor is connected between the anode of the first voltage stabilizing diode and the LED anode of the optical coupler, the other end of the fourth resistor is connected between the LED cathode of the optical coupler and the welding machine negative output end; the collector of the photodetector of the optical coupler is connected with the anti-sticking signal output unit, the emitter of the photodetector of the optical coupler is grounded.

[0011] Further, when the welding machine output end voltage signal of the welding machine positive output end is collected, the welding machine output end voltage signal is input to the LED anode of the optical coupler after passing through the first resistor, the third resistor and the first voltage stabilizing diode in turn, and then is input to the welding machine negative output end through the LED cathode of the optical coupler, at this time the optical coupler is turned on.

[0012] When there is no voltage signal input to the welding machine positive input end, the optical coupler is not turned on.

[0013] Further, the anti-sticking signal output unit comprises a fifth resistor, a sixth resistor, an operational amplifier, a seventh resistor, an eighth resistor, a first diode and a second capacitor; the positive input end of the operational amplifier is connected with the voltage feedback unit, one end of the fifth resistor is connected with the first working voltage input end, the other end of the fifth resistor is connected between the collector of the photodetector of the optical coupler and the positive input end of the operational amplifier; the negative input end of the operational amplifier is connected with one end of the sixth resistor, the other end of the sixth resistor is connected with the second working voltage input end; the output end of the operational amplifier is connected with one end of the eighth resistor, the other end of the eighth resistor is connected with the cathode of the first diode, the anode of the first diode is connected with the anti-sticking control unit; one end of the seventh resistor is connected with the output end of the operational amplifier, the other end of the seventh resistor is connected with the anode of the first diode, one end of the second capacitor is connected with the anode of the first diode, the other end of the second capacitor is grounded.

[0014] Further, the anti-sticking signal output unit comprises a fifth resistor, a sixth resistor, an operational amplifier, a seventh resistor, an eighth resistor, a first diode and a second capacitor; the positive input end of the operational amplifier is connected with the photoelectric detector collector of the photo-coupler; one end of the fifth resistor is connected with the first working voltage input end; the other end of the fifth resistor is connected between the photoelectric detector collector of the photo-coupler and the positive input end of the operational amplifier; the negative input end of the operational amplifier is connected with one end of the sixth resistor; the other end of the sixth resistor is connected with the second working voltage input end; the output end of the operational amplifier is connected with one end of the eighth resistor; the other end of the eighth resistor is connected with the cathode of the first diode; the anode of the first diode is connected with the anti-sticking control unit; one end of the seventh resistor is connected with the output end of the operational amplifier; the other end of the seventh resistor is connected with the anode of the first diode; one end of the second capacitor is connected with the anode of the first diode; the other end of the second capacitor is grounded, wherein the first working voltage is greater than the second working voltage.

[0015] Further, when the photo-coupler is turned on, the positive input end voltage of the operational amplifier is clamped to 0V, the second working voltage is input to the negative input end voltage of the operational amplifier through the sixth resistor, at this time, the negative input end voltage of the operational amplifier is greater than the positive input end voltage, so that the output end voltage of the operational amplifier is 0V, and the anti-sticking signal output unit has no anti-sticking voltage signal output;

[0016] When the photo-coupler is not turned on, the positive input end voltage of the operational amplifier returns to the first working voltage, the positive input end voltage of the operational amplifier is greater than the negative input end voltage, so that the output end voltage of the operational amplifier is 13V, and the anti-sticking signal output unit has anti-sticking voltage signal output.

[0017] Further, the anti-sticking control unit comprises a second voltage stabilizing diode, a ninth resistor, a tenth resistor and a triode; the cathode of the second voltage stabilizing diode is connected with the anti-sticking signal output unit; the anode of the second voltage stabilizing diode is connected with one end of the ninth resistor; the other end of the ninth resistor is connected with one end of the tenth resistor; the other end of the tenth resistor is connected with the base of the triode; the collector of the triode is connected with the given input end of the welding machine PI circuit; and the emitter of the triode is grounded.

[0018] Further, the anti-sticking control unit comprises a second voltage stabilizing diode, a ninth resistor, a tenth resistor and a triode; the cathode of the second voltage stabilizing diode is connected with the anode of the first diode; the anode of the second voltage stabilizing diode is connected with one end of the ninth resistor; the other end of the ninth resistor is connected with one end of the tenth resistor; the other end of the tenth resistor is connected with the base of the triode; the collector of the triode is connected with the given input end of the welding machine PI circuit; and the emitter of the triode is grounded.

[0019] Further, when the anti-sticking signal output unit has no anti-sticking voltage signal output, the triode is cut off;

[0020] When the anti-sticking signal output unit has anti-sticking voltage signal output, the anti-sticking voltage signal sequentially passes through the second stabilizing diode, the ninth resistor and the tenth resistor, and is input to the base of the triode, the triode is turned on, and the collector voltage of the triode is clamped to 0V.

[0021] The utility model discloses still provide a kind of control device for preventing welding machine electrode sticking, and control device includes pcd circuit board, and the control circuit for preventing welding machine electrode sticking as described in any of the above is printed on the pcd circuit board.

[0022] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0023] In the embodiment, the voltage of the welding machine output end is collected by the voltage feedback unit, and the welding machine working state is judged according to the welding machine output end voltage to control the conduction state of the optocoupler; the positive input end voltage of the operational amplifier is controlled by the conduction state of the optocoupler, and the size of the positive input end voltage and the negative input end voltage is judged to control the output end voltage of the operational amplifier, then the anti-sticking signal output unit outputs the anti-sticking voltage signal according to the output end voltage of the operational amplifier, finally the anti-sticking voltage signal is input to the triode, the triode is turned on, and the collector voltage of the triode is clamped to 0V; at this time, the welding machine PI circuit given input end is also clamped to 0V, the welding machine has no current voltage output, and the electrode has no current flowing through, so that the electrode can be taken off from the workpiece, and sticking is prevented. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme of the exemplary embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the utility model, and therefore should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor according to these drawings. In the drawings:

[0025] Figure 1 It is a circuit schematic diagram of the control circuit for preventing welding machine electrode sticking in the embodiment. DETAILED DESCRIPTION

[0026] Exemplary embodiments of the present disclosure are described herein below with reference to the accompanying drawings, in which various details are set forth to provide an understanding of embodiments of the present disclosure. However, it will be apparent to one of ordinary skill in the art that various changes in the details described herein can be made without departing from the scope of the present disclosure. Also, the description set forth herein with reference to the accompanying drawings is merely exemplary. Accordingly, a person of ordinary skill in the art should recognize that various changes in the described embodiments can be made without departing from the scope of the present disclosure. Also, descriptions of known functions and constructions are omitted in the following description for clarity and conciseness.

[0027] In the present disclosure, the terms "first", "second", and the like are used to describe various elements only and do not intend to limit the positional relationship, the time relationship, or the importance of the elements, and such terms are used only to distinguish one element from another element. In some examples, the first element and the second element can refer to the same instance of the element, and in some cases, based on the context of the description, they can also refer to different instances.

[0028] The terms used in the description of various examples in the present disclosure are only for the purpose of describing the specific examples and are not intended to be limiting. Unless the number of elements is specifically limited, the element can be one or more than one, if not specifically limited by the context. In addition, the term "and / or" used in the present disclosure encompasses any one of the listed items and all possible combinations thereof.

[0029] Embodiment 1

[0030] Referring to Figure 1 As shown, the embodiment provides a control circuit for preventing electrode sticking of a welding machine, the circuit comprising:

[0031] a voltage feedback unit connected with the welding machine output terminal X1, for collecting the welding machine output terminal voltage; a sticking prevention control unit connected with the given input terminal of the welding machine PI circuit, for outputting a sticking prevention voltage signal to control the welding machine PI circuit current; and a sticking prevention signal output unit connected between the voltage feedback unit and the sticking prevention control unit, for outputting the sticking prevention voltage signal based on the voltage signal input by the voltage feedback unit.

[0032] Specifically, in the embodiment, the welding machine output terminal voltage is collected by the voltage feedback unit, the welding machine working state is determined according to the welding machine output terminal voltage, the sticking prevention voltage signal is output based on the collected welding machine output terminal voltage by the sticking prevention signal output unit, and finally the welding machine PI circuit current is controlled based on the sticking prevention voltage signal by the sticking prevention control unit, so as to achieve the purpose of preventing electrode sticking.

[0033] As a possible implementation, the welding machine output end comprises a welding machine positive output end and a welding machine negative output end, and the voltage feedback unit comprises a first resistor R1, a second resistor R2, a third resistor R3, a first voltage stabilizing diode Z1, a first capacitor C1, a fourth resistor R4, and an optical coupler U1; one end of the series connection of the first resistor R1 and the third resistor R3 is connected to the welding machine positive output end, the other end of the series connection of the first resistor R1 and the third resistor R3 is connected to the cathode of the first voltage stabilizing diode Z1, and the anode of the first voltage stabilizing diode Z1 is connected to the anode of the LED of the optical coupler U1; the cathode of the LED of the optical coupler U1 is connected to the welding machine negative output end; one end of the parallel connection of the second resistor R2 and the first capacitor C1 is connected between the first resistor R1 and the third resistor R3, and the other end of the parallel connection of the second resistor R2 and the first capacitor C1 is connected between the cathode of the LED of the optical coupler U1 and the welding machine negative output end; one end of the fourth resistor R4 is connected between the anode of the first voltage stabilizing diode Z1 and the anode of the LED of the optical coupler U1, and the other end of the fourth resistor R4 is connected between the cathode of the LED of the optical coupler U1 and the welding machine negative output end; the collector of the photodetector of the optical coupler U1 is connected to the anti-sticking signal output unit, and the emitter of the photodetector of the optical coupler U1 is grounded.

[0034] It should be noted that, in the present embodiment, the collected welding machine input end voltage is divided by the first resistor R1 and the second resistor R2, and the voltage is filtered by the first capacitor C1.

[0035] Specifically, in the present embodiment, when the welding machine output end voltage signal of the welding machine positive output end is collected (at this time, the welding machine is in an idle state or in a normal welding state, and the welding machine positive output end outputs a high direct current voltage of 60 VDC or above), the welding machine output end voltage signal sequentially passes through the first resistor R1, the third resistor R3, and the first voltage stabilizing diode Z1, and is subjected to voltage division by the second resistor R2 and filtering by the first capacitor C1, and then is input to the anode of the LED of the optical coupler U1, and then is input to the welding machine negative output end through the cathode of the LED of the optical coupler U1 to form a loop, at this time, the optical coupler U1 is turned on, the collector and the emitter of the photodetector of the optical coupler U1 are connected, and the collector of the photodetector of the optical coupler U1 is clamped to 0 V;

[0036] When there is no voltage signal input to the welding machine positive input end (at this time, the welding machine is in a welding electrode sticking state), the welding machine positive output end and the welding machine negative output end are short-circuited, and the positive output end voltage and the negative output end voltage are 0 V, at this time, the optical coupler U1 is not turned on, the collector and the emitter of the photodetector of the optical coupler U1 are disconnected, and the collector of the photodetector of the optical coupler U1 returns to 15 V.

[0037] As a possible implementation, the anti-sticking signal output unit comprises a fifth resistor R5, a sixth resistor R6, an operational amplifier U2, a seventh resistor R7, an eighth resistor R8, a first diode D1 and a second capacitor C2; the positive input terminal of the operational amplifier U2 is connected with the photodetector collector of the optocoupler U1, one end of the fifth resistor R5 is connected with the first working voltage input terminal, and the other end of the fifth resistor R5 is connected between the photodetector collector of the optocoupler U1 and the positive input terminal of the operational amplifier U2; the negative input terminal of the operational amplifier U2 is connected with one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected with the second working voltage input terminal; one end of the eighth resistor R8 is connected with the output terminal of the operational amplifier U2, and the other end of the eighth resistor R8 is connected with the cathode of the first diode D1, the anode of the first diode D1 is connected with the anti-sticking control unit; one end of the seventh resistor R7 is connected with the output terminal of the operational amplifier U2, the other end of the seventh resistor R7 is connected with the anode of the first diode D1, one end of the second capacitor C2 is connected with the anode of the first diode D1, and the other end of the second capacitor C2 is grounded, wherein the first working voltage is greater than the second working voltage.

[0038] It should be noted that in the embodiment, the first working voltage is +15V, the second working voltage is +5.1V, and the model of the operational amplifier U2 is LM324.

[0039] Specifically, in the embodiment, when the optocoupler U1 is turned on, i.e. the photodetector collector of the optocoupler U1 is clamped to 0V, at this time, the positive input terminal voltage of the operational amplifier U2 is also clamped to 0V, the second working voltage is input to the negative input terminal voltage of the operational amplifier U2 through the sixth resistor R6, at this time, the negative input terminal voltage of the operational amplifier U2 is greater than the positive input terminal voltage, so that the output terminal voltage of the operational amplifier U2 is 0V, and the anti-sticking signal output unit has no anti-sticking voltage signal output.

[0040] When the optocoupler U1 is not turned on, i.e. the photodetector collector of the optocoupler U1 returns to 15V, at this time, the positive input terminal voltage of the operational amplifier U2 also returns to the first working voltage, the positive input terminal voltage of the operational amplifier U2 is greater than the negative input terminal voltage, so that the output terminal voltage of the operational amplifier U2 is 13V, and the anti-sticking signal output unit has anti-sticking voltage signal output.

[0041] Meanwhile, in the embodiment, the output terminal voltage of the operational amplifier U2 first charges the second capacitor C2, and the charging time of the second capacitor C2 is the response time of the anti-sticking control unit, which prevents the anti-sticking control unit from being too sensitive and affecting normal welding.

[0042] As a possible implementation, the anti-sticking control unit comprises a second Zener diode Z2, a ninth resistor R9, a tenth resistor R10 and a triode Q1; the cathode of the second Zener diode Z2 is connected with the anode of the first diode D1, the anode of the second Zener diode Z2 is connected with one end of the ninth resistor R9, the other end of the ninth resistor R9 is connected with one end of the tenth resistor R10, the other end of the tenth resistor R10 is connected with the base of the triode Q1, the collector of the triode Q1 is connected with the given input end of the welding machine PI circuit, and the emitter of the triode Q1 is grounded.

[0043] Specifically, in the embodiment, when the anti-sticking signal output unit has no anti-sticking voltage signal output (at this time, the welding machine is in an idle or normal welding state), the triode Q1 is cut off, and normal welding work can be performed.

[0044] When the anti-sticking signal output unit has an anti-sticking voltage signal output (at this time, the welding machine is in a welding electrode sticking state), the anti-sticking voltage signal sequentially passes through the second Zener diode Z2, the ninth resistor R9 and the tenth resistor R10, is input to the base of the triode Q1, the triode Q1 is turned on, and the collector voltage of the triode Q1 is clamped to 0V; at this time, the given input end of the welding machine PI circuit is clamped to 0V, the welding machine has no current voltage output, and the electrode has no current flowing therethrough; at this time, the electrode can be easily taken off from the workpiece, and the electrode will not be red and hot.

[0045] Work flow: when the welding machine is in a welding electrode sticking state, the positive and negative output ends of the welding machine are short-circuited, the voltage feedback unit collects the voltage at the output end of the welding machine as 0V, at this time, the optocoupler U1 is not turned on, the collector and emitter of the photodetector of the optocoupler U1 are disconnected, and the collector of the photodetector of the optocoupler U1 is 15V; at this time, the positive input voltage of the operational amplifier U2 also returns to 15V, the positive input voltage (15V) of the operational amplifier U2 is greater than the negative input voltage (5.1V), so that the output voltage of the operational amplifier U2 is 13V, the anti-sticking signal output unit outputs the anti-sticking voltage signal, the anti-sticking voltage signal sequentially passes through the second Zener diode Z2, the ninth resistor R9 and the tenth resistor R10, is input to the base of the triode Q1, the triode Q1 is turned on, and the collector voltage of the triode Q1 is clamped to 0V; at this time, the given input end of the welding machine PI circuit is clamped to 0V, the welding machine has no current voltage output, and the electrode has no current flowing therethrough, so that the electrode can be taken off from the workpiece and the sticking is prevented.

[0046] Embodiment 2

[0047] The utility model discloses still provide a kind of control device for preventing welding machine electrode sticking, and control device includes pcd circuit board, and pcd circuit board is printed with the control circuit for preventing welding machine electrode sticking as any of the above.

[0048] The above specific embodiments explain the purpose, technical scheme and beneficial effects of the present application in further detail, and it should be understood that the above description is only a specific embodiment of the present application and is not used to limit the protection scope of the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A control circuit for preventing welding rods from sticking together in a welding machine, characterized in that, The circuit includes: A voltage feedback unit connected to the output terminal of the welding machine is used to collect the voltage at the output terminal of the welding machine; An anti-sticking control unit connected to the input terminal of the welding machine's PI circuit is used to output an anti-sticking voltage signal to control the current of the welding machine's PI circuit. And an anti-sticking signal output unit connected between the voltage feedback unit and the anti-sticking control unit, for outputting an anti-sticking voltage signal based on the voltage signal input from the voltage feedback unit.

2. The control circuit for preventing welding rods from sticking together in a welding machine according to claim 1, characterized in that, The welding machine output terminal includes a positive output terminal and a negative output terminal. The voltage feedback unit includes a first resistor, a second resistor, a third resistor, a first Zener diode, a first capacitor, a fourth resistor, and an optocoupler. One end of the first and third resistors connected in series is connected to the positive output terminal of the welding machine, and the other end of the first and third resistors connected in series is connected to the cathode of the first Zener diode. The anode of the first Zener diode is connected to the anode of the LED in the optocoupler. The cathode of the LED in the optocoupler is connected to the negative output terminal of the welding machine. One end of the second resistor and the first capacitor connected in parallel is connected between the first and third resistors, and the other end of the second resistor and the first capacitor connected in parallel is connected between the cathode of the LED in the optocoupler and the negative output terminal of the welding machine. One end of the fourth resistor is connected between the anode of the first Zener diode and the anode of the LED in the optocoupler, and the other end of the fourth resistor is connected between the cathode of the LED in the optocoupler and the negative output terminal of the welding machine. The collector of the photodetector of the optocoupler is connected to the anti-sticking signal output unit, and the emitter of the photodetector of the optocoupler is grounded.

3. The control circuit for preventing welding rods from sticking together in a welding machine according to claim 1, characterized in that, When the voltage signal of the welding machine output terminal is acquired at the positive output terminal of the welding machine, the voltage signal of the welding machine output terminal passes through the first resistor, the third resistor and the first Zener diode in sequence and is then input to the LED anode of the optocoupler, and then through the LED cathode of the optocoupler to the negative output terminal of the welding machine. At this time, the optocoupler is turned on. When there is no voltage signal input at the positive input terminal of the welding machine, the optocoupler does not conduct.

4. The control circuit for preventing welding rods from sticking together in a welding machine according to claim 1, characterized in that, The anti-sticking signal output unit includes a fifth resistor, a sixth resistor, an operational amplifier, a seventh resistor, an eighth resistor, a first diode, and a second capacitor. The positive input terminal of the operational amplifier is connected to the voltage feedback unit. One end of the fifth resistor is connected to the first operating voltage input terminal, and the other end of the fifth resistor is connected between the collector of the photodetector of the optocoupler and the positive input terminal of the operational amplifier. The negative input terminal of the operational amplifier is connected to one end of the sixth resistor, and the other end of the sixth resistor is connected to the second operating voltage input terminal. The output terminal of the operational amplifier is connected to one end of the eighth resistor, and the other end of the eighth resistor is connected to the cathode of the first diode. The anode of the first diode is connected to the anti-sticking control unit. One end of the seventh resistor is connected to the output terminal of the operational amplifier, and the other end of the seventh resistor is connected to the anode of the first diode. One end of the second capacitor is connected to the anode of the first diode, and the other end of the second capacitor is grounded.

5. The control circuit for preventing welding rods from sticking together in a welding machine according to claim 3, characterized in that, The anti-sticking signal output unit includes a fifth resistor, a sixth resistor, an operational amplifier, a seventh resistor, an eighth resistor, a first diode, and a second capacitor. The positive input terminal of the operational amplifier is connected to the collector of the photodetector of the optocoupler. One end of the fifth resistor is connected to the first operating voltage input terminal, and the other end of the fifth resistor is connected between the collector of the photodetector of the optocoupler and the positive input terminal of the operational amplifier. The negative input terminal of the operational amplifier is connected to one end of the sixth resistor, and the other end of the sixth resistor is connected to the second operating voltage input terminal. The output terminal of the operational amplifier is connected to one end of the eighth resistor, and the other end of the eighth resistor is connected to the cathode of the first diode. The anode of the first diode is connected to the anti-sticking control unit. One end of the seventh resistor is connected to the output terminal of the operational amplifier, and the other end of the seventh resistor is connected to the anode of the first diode. One end of the second capacitor is connected to the anode of the first diode, and the other end of the second capacitor is grounded. The first operating voltage is greater than the second operating voltage.

6. The control circuit for preventing welding rod adhesion in a welding machine according to claim 5, characterized in that, When the optocoupler is on, the voltage at the positive input terminal of the operational amplifier is clamped to 0V. The second operating voltage is input to the negative input terminal of the operational amplifier through the sixth resistor. At this time, the voltage at the negative input terminal of the operational amplifier is greater than the voltage at the positive input terminal, so that the voltage at the output terminal of the operational amplifier is 0V, and the anti-sticking signal output unit has no anti-sticking voltage signal output. When the optocoupler is not conducting, the voltage at the positive input terminal of the operational amplifier returns to the first operating voltage. The voltage at the positive input terminal of the operational amplifier is greater than the voltage at the negative input terminal, making the output voltage of the operational amplifier 13V. The anti-sticking signal output unit outputs an anti-sticking voltage signal.

7. The control circuit for preventing welding rods from sticking together in a welding machine according to claim 1, characterized in that, The anti-stick control unit includes a second Zener diode, a ninth resistor, a tenth resistor, and a transistor; the cathode of the second Zener diode is connected to the anti-stick signal output unit, the anode of the second Zener diode is connected to one end of the ninth resistor, the other end of the ninth resistor is connected to one end of the tenth resistor, the other end of the tenth resistor is connected to the base of the transistor, the collector of the transistor is connected to the input terminal of the welding machine PI circuit, and the emitter of the transistor is grounded.

8. A control circuit for preventing welding rod adhesion according to claim 4 or 5, characterized in that, The anti-stick control unit includes a second Zener diode, a ninth resistor, a tenth resistor, and a transistor; the cathode of the second Zener diode is connected to the anode of the first diode, the anode of the second Zener diode is connected to one end of the ninth resistor, the other end of the ninth resistor is connected to one end of the tenth resistor, the other end of the tenth resistor is connected to the base of the transistor, the collector of the transistor is connected to the input terminal of the welding machine's PI circuit, and the emitter of the transistor is grounded.

9. A control circuit for preventing welding rods from sticking together in a welding machine according to claim 8, characterized in that, When there is no anti-sticking voltage signal output from the anti-sticking signal output unit, the transistor is cut off; When the anti-adhesion signal output unit outputs an anti-adhesion voltage signal, the anti-adhesion voltage signal passes through the second Zener diode, the ninth resistor, and the tenth resistor in sequence and is input to the base of the transistor. The transistor is turned on, clamping the collector voltage of the transistor to 0V.

10. A control device for preventing welding rods from sticking together in a welding machine, characterized in that, The control device includes a PCD circuit board, on which a control circuit for preventing welding electrode adhesion as described in any one of claims 1-9 is printed.

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