CN212094795U - Plasma cutting machine - Google Patents
Plasma cutting machine Download PDFInfo
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- CN212094795U CN212094795U CN202020203845.1U CN202020203845U CN212094795U CN 212094795 U CN212094795 U CN 212094795U CN 202020203845 U CN202020203845 U CN 202020203845U CN 212094795 U CN212094795 U CN 212094795U
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Abstract
The utility model relates to a plasma cutting machine, which comprises an electrode and a cutting device, wherein the electrode is used for generating a high-voltage electric field to ionize ionic gas; further comprising: the first gas valve is used for outputting gas at a first gas pressure; the second air valve is used for outputting air at a second air pressure, and the first air pressure is smaller than the second air pressure; the driving circuit is used for driving the electrodes to generate a high-voltage electric field; the control circuit is used for outputting a first control signal and a driving signal when receiving the opening signal, wherein the first control signal is used for driving the first air valve to work, and the driving signal is used for controlling the driving circuit to work; and the second control signal is used for driving the second air valve to work. The utility model discloses be equipped with first pneumatic valve and second pneumatic valve, control circuit discerns the operating condition of plasma cutting machine to control first pneumatic valve and second pneumatic valve work, satisfy the needs of plasma cutting machine when different operating condition, promote the striking success rate and cut the quality.
Description
Technical Field
The utility model relates to a plasma cutting technical field especially relates to a plasma cutting machine.
Background
Plasma cutting is a cutting method in which a part of metal on a workpiece is melted and evaporated by a high-temperature and high-speed plasma arc beam and blown off a substrate, and a slit is formed along with the movement of a plasma cutting machine. The requirements of plasma cutting on input air pressure and air flow are strict, when the air pressure is low and the air flow is low, the cutting quality is poor, slag is seriously adhered to the back of a tangent plane, the cutting is difficult to clean, and the manual deslagging cost is increased; when the gas pressure is too high, the arc striking difficulty is caused.
The input air pressure of the conventional plasma cutting is set through a mechanical pressure reducing valve, and the on-off control of the air is realized through a single air valve. When the plasma cutting machine is used, cutting can be performed only after the arc striking is successful, and the control of the gas flow in different cutting processes is difficult to meet through the existing single gas valve control, so that the arc striking success rate and the quality of cutting seams are reduced.
SUMMERY OF THE UTILITY MODEL
Therefore, there is a need for a plasma cutting machine, which can adjust the gas pressure of the output gas according to different cutting processes, and improve the success rate of arc striking and the quality of cutting seams.
A plasma cutting machine comprises an electrode, a cutting head and a cutting head, wherein the electrode is used for generating a high-voltage electric field to ionize ion gas; further comprising:
the first gas valve is used for outputting gas at a first gas pressure;
the second air valve is used for outputting air at a second air pressure, and the first air pressure is smaller than the second air pressure;
the driving circuit is used for driving the electrodes to generate a high-voltage electric field;
the control circuit is used for outputting a first control signal and a driving signal when receiving the opening signal, wherein the first control signal is used for driving the first air valve to work, and the driving signal is used for controlling the driving circuit to work; and the second control signal is used for driving the second air valve to work.
In one embodiment, the control circuit comprises:
the switching circuit is used for outputting a starting signal when receiving a starting signal input by a user;
the current detection circuit is used for outputting a current feedback signal when detecting that the driving circuit outputs current;
the controller is electrically connected with the switch circuit and the current detection circuit and is used for outputting a first control signal when receiving the starting signal; the current feedback circuit is also used for outputting a second control signal when receiving the current feedback signal;
the first air valve driving circuit is electrically connected with the controller and is used for driving the first air valve to open when receiving a first control signal;
and the second air valve driving circuit is electrically connected with the controller and is used for driving the second air valve to open when receiving the second control signal.
In one embodiment, the control circuit further comprises:
and the delay control circuit is used for outputting a delay control signal to the second air valve driving circuit when the controller stops outputting the second control signal, and the delay control signal is used for controlling the second air valve driving circuit to be switched off in a delay way.
In one embodiment, the first valve drive circuit comprises: the circuit comprises a first optocoupler, a first silicon controlled rectifier, a first resistor and a second resistor;
the anode of the transmitting end of the first optocoupler is used for being electrically connected with a working power supply, the cathode of the transmitting end is electrically connected with the first control signal output end of the controller, the first end of the receiving end of the first optocoupler is electrically connected with the first end of the first resistor, and the second end of the receiving end of the first optocoupler is electrically connected with the first end of the second resistor;
a gate of the first controllable silicon is electrically connected with a first end of a receiving end of the first optocoupler, a first terminal is electrically connected with a second end of the first resistor, and a second terminal is electrically connected with a second end of the second resistor;
the second end of the first resistor is electrically connected with the first end of the coil of the first air valve, and the second end of the coil of the first air valve is electrically connected with one pole of the power supply;
and the second end of the second resistor is used for being electrically connected with the other pole of the power supply.
In one embodiment, the first valve drive circuit further comprises: a first capacitor;
the first end of the first capacitor is electrically connected with the first terminal of the first controllable silicon, and the second end of the first capacitor is electrically connected with the second terminal of the first controllable silicon.
In one embodiment, the second valve driver circuit comprises: the second optical coupler, the second silicon controlled rectifier, the third resistor and the fourth resistor;
the anode of the transmitting end of the second optocoupler is used for being electrically connected with a working power supply, the cathode of the transmitting end is electrically connected with the first control signal output end of the controller, the first end of the receiving end of the second optocoupler is electrically connected with the first end of the third resistor, and the second end of the receiving end of the second optocoupler is electrically connected with the first end of the fourth resistor;
a gate of the second controllable silicon is electrically connected with a first end of a receiving end of the second optocoupler, a first terminal is electrically connected with a second end of the third resistor, and a second terminal is electrically connected with a second end of the fourth resistor;
the second end of the third resistor is electrically connected with the first end of the coil of the second air valve, and the second end of the coil of the second air valve is used for being electrically connected with one pole of the power supply;
and the second end of the fourth resistor is used for being electrically connected with the other pole of the power supply.
In one embodiment, the first valve drive circuit further comprises: a second capacitor;
the first end of the second capacitor is electrically connected with the first terminal of the second controllable silicon, and the second end of the second capacitor is electrically connected with the second terminal of the second controllable silicon.
In one embodiment, the switching circuit includes: the switch, a fifth resistor, a third optocoupler, a sixth resistor and a third capacitor;
the first end of the switch is electrically connected with the cathode of the emitting end of the third optocoupler, and the second end of the switch is grounded;
an anode of an emitting end of the third optocoupler is electrically connected with a first end of the fifth resistor, a collector of a receiving end of the third optocoupler is electrically connected with a starting signal input end of the controller, and an emitter is grounded;
a first end of the sixth resistor is electrically connected with an emitter of a receiving end of the third optocoupler, and a second end of the sixth resistor is electrically connected with a working power supply;
the first end of the third capacitor is electrically connected with the first end of the switch, and the second end of the third capacitor is grounded.
In one embodiment, a current sensing circuit includes: the current sensor, the seventh resistor, the amplifier, the fourth capacitor and the eighth resistor;
the output end of the current sensor is electrically connected with the first end of the seventh resistor, and the input end of the current sensor is used for detecting the output current of the driving circuit;
the second end of the seventh resistor is electrically connected with the positive input end of the amplifier;
the negative input end of the amplifier is electrically connected with the output end of the amplifier, and the output end of the amplifier is electrically connected with the current feedback signal input end of the controller;
the first end of the fourth capacitor is electrically connected with the second end of the seventh resistor, and the second end of the fourth capacitor is grounded;
the first end of the eighth resistor is electrically connected with the second end of the seventh resistor, and the second end of the eighth resistor is grounded.
In one embodiment, the current detection circuit further includes: an adjustable resistor;
the first end of the adjustable resistor is electrically connected with the output end of the current sensor, and the second end of the adjustable resistor is electrically connected with the first end of the seventh resistor.
The plasma cutting machine is provided with the first air valve and the second air valve with different pressures, the working state of the plasma cutting machine is identified by using the control circuit, when the opening signal is received, the first air valve is driven to work, and arc striking is performed by using the gas output by the first air valve because the air pressure of the first air valve is smaller; and meanwhile, a driving signal is sent to control the driving circuit to work, whether the driving circuit outputs current is detected, if so, the second air valve is driven to cut by other second output gas, the air pressure requirement of the plasma cutting machine in different working states is met, and the arc striking success rate and the cutting quality are improved.
Drawings
FIG. 1 is a block diagram of a plasma cutter in one embodiment;
FIG. 2 is a block diagram of a control circuit in one embodiment;
FIG. 3 is a block diagram of a control circuit with a delay control circuit according to one embodiment;
FIG. 4 is a schematic circuit diagram of a first air valve driving circuit according to an embodiment;
FIG. 5 is a schematic circuit diagram of a first air valve driving circuit according to another embodiment;
FIG. 6 is a schematic diagram of a second valve driver circuit according to an embodiment;
FIG. 7 is a schematic diagram of a second exemplary embodiment of a second valve driver circuit;
FIG. 8 is a schematic diagram of a circuit configuration of a switch circuit according to an embodiment;
FIG. 9 is a schematic diagram of a circuit configuration of a current detection circuit according to an embodiment;
fig. 10 is a schematic circuit diagram of a current detection circuit according to another embodiment.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully below. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In one embodiment, as shown in fig. 1, there is provided a plasma cutting machine including an electrode 500 for generating a high voltage electric field to ionize an ion gas; further comprising:
a first gas valve 100 for outputting gas at a first gas pressure;
the second gas valve 200 is used for outputting gas at a second gas pressure, and the first gas pressure is smaller than the second gas pressure;
a driving circuit 400 for driving the electrode 500 to generate a high voltage electric field;
the control circuit 300 is configured to output a first control signal and a driving signal when receiving the start signal, where the first control signal is used to drive the first air valve 100 to operate, and the driving signal is used to control the driving circuit 400 to operate; and is further configured to output a second control signal when detecting that the driving circuit 400 outputs current, where the second control signal is used to drive the second gas valve 200 to operate.
The first air valve 100 and the second air valve 200 are both electric control air valves, and the on-off of the air path is switched by using an electromagnetic valve. The first air pressure and the second air pressure can be set by a person skilled in the art according to requirements, so that the first air pressure can meet the air pressure requirement of arc striking, and the second air pressure can meet the air pressure requirement of cutting.
The gas is subjected to an electric field or thermal energy which causes electrons in neutral gas atoms to gain sufficient energy to overcome the atomic nuclei' attraction to become free electrons, while neutral atoms or molecules become positively charged positive ions by losing negatively charged electrons. This process of causing neutral gas molecules or atoms to release electrons to form positive ions is called gas ionization. The ionization process occurs and a plasma is formed. After the power is switched on, the gas output by the gas valve is ionized by using a high-voltage electric field generated between the electrode 500 and the workpiece, high-temperature ion gas flow is generated and is sprayed out of a nozzle pore of the plasma cutting machine, and a slender arc column is formed by compression and can be used for cutting. When the cutting machine is used for arc striking, high voltage of more than 3kV and high-frequency oscillation of more than 150-200 kHz are required to be generated between a workpiece and an electrode 500, and a neutral gas medium is punctured to form an electric arc. After the arc striking is successful, the current flows between the electrode 500 and the workpiece, when the current output by the driving circuit 400 is detected, the arc striking can be judged to be successful, at the moment, the cutting state can be entered,
the plasma cutting machine is provided with the first air valve 100 and the second air valve 200 with different pressures, the working state of the plasma cutting machine is identified by using the control circuit 300, when an opening signal is received, the first air valve 100 is driven to work, and arc striking is performed by using the gas output by the first air valve 100 because the air pressure of the first air valve 100 is smaller; and meanwhile, a driving signal is sent to control the driving circuit 400 to work, whether the driving circuit 400 outputs current is detected, if so, the second gas valve 200 is driven to cut by other second output gas, the requirement of the plasma cutting machine on gas pressure in different working states is met, and the arc striking success rate and the cutting quality are improved.
In one embodiment, as shown in fig. 2, the control circuit 300 includes:
the switch circuit 320 is used for outputting a starting signal when receiving a starting signal input by a user;
a current detection circuit 330 for outputting a current feedback signal when detecting that the driving circuit 400 outputs a current;
the controller 310 is electrically connected to the switch circuit 320 and the current detection circuit 330, and is configured to output a first control signal when receiving the start signal; the current feedback circuit is also used for outputting a second control signal when receiving the current feedback signal;
the first air valve driving circuit 340 is electrically connected with the controller 310 and is used for driving the first air valve 100 to open when receiving a first control signal;
the second air valve driving circuit 350, electrically connected to the controller 310, is used for driving the second air valve 200 to open when receiving the second control signal.
The switch circuit 320 may receive an opening signal input by a user through the switch K, the user may input the opening signal by closing the switch K, a closed loop may be formed after the switch K in the switch circuit 320 is closed, the start signal may be output to the controller 310, and the controller 310 may input a high level signal or a low level signal as the start signal according to a characteristic option of the controller 310.
When detecting the output current of the driving circuit 400, the current detecting circuit 330 outputs a high level or a low level as a current feedback signal to the controller 310, and triggers the controller 310 to switch from the arc striking stage to the cutting state.
The controller 310 is a microprocessor, and in one embodiment, may be an AMR chip, and performs corresponding control according to level signals received by different pins, when the pin of the start signal input terminal 314 receives a start signal, the first control signal output terminal 311 outputs a first control signal, and the first control signal is also a level signal and is used for driving the first valve driving circuit 340 to be powered on; when the current feedback signal is received at the pin 315, the second control signal output end 312 outputs a second control signal, which is also a level signal for driving the second valve driving circuit 350 to power up. The control logic of the controller 310 is a common control method, and a person skilled in the art can select a corresponding chip to control according to the need, which is not the point of the invention.
In one embodiment, as shown in fig. 3, the control circuit 300 further includes:
and the delay control circuit 360 is configured to output a delay control signal to the second air valve driving circuit 350 when the controller 310 stops outputting the second control signal, where the delay control signal is used to control the second air valve driving circuit 350 to be switched off in a delay manner.
The delay control circuit 360 is used for keeping the solenoid valve of the second gas valve 200 powered on after the second control signal is stopped, so that the second gas valve 200 can continue to work for a period of time, and continue to output gas to cool the plasma cutting machine.
In one embodiment, the delay control circuit 360 may employ a precise long delay circuit, an RC delay circuit, a monostable delay circuit formed by a single operational amplifier, a transistor delay circuit, or other common delay circuits.
In one embodiment, as shown in fig. 4, the first valve driving circuit 340 includes: the first optical coupler OC1, the first silicon controlled rectifier SCR1, the first resistor R1 and the second resistor R2;
an anode of a transmitting end of the first optical coupler OC1 is used for being electrically connected with a working power supply, a cathode of the transmitting end is electrically connected with a first control signal output end 311 of the controller 310, a first end of a receiving end of the first optical coupler OC1 is electrically connected with a first end of a first resistor R1, and a second end of a receiving end of the first optical coupler OC1 is electrically connected with a first end of a second resistor R2;
the gate of the first silicon controlled SCR1 is electrically connected with the first end of the receiving end of the first optical coupler OC1, the first terminal is electrically connected with the second end of the first resistor R1, and the second terminal is electrically connected with the second end of the second resistor R2;
the second end of the first resistor R1 is electrically connected with the first end of the coil of the first air valve 100, and the second end of the coil of the first air valve 100 is used for being electrically connected with one pole of the power supply;
the second end of the second resistor R2 is used for electrically connecting to the other pole of the power supply.
The power supply is ac power, and if the power supply is directly connected to the circuit of the controller 310, the controller 310 may be damaged, and a first optical coupler OC1 is provided for isolating the controller 310 from the power supply. The operating power supply is a low voltage dc power supply that powers the controller 310 circuitry. When the first control signal output end 311 of the controller 310 outputs a low level, the first optical coupler OC1 is turned on, at this time, the first thyristor SCR1 is turned on, and the coil of the first air valve 100 is connected to the power supply circuit to be powered on, so that the first air valve 100 works. The first resistor R1 and the second resistor R2 are voltage dividing resistors, and after voltage outputted by the power supply is divided, the first optical coupler OC1 controls the conduction of the first silicon controlled rectifier SCR 1. Because the power supply is alternating current, the first SCR1 is a triac.
In one embodiment, as shown in fig. 5, the first valve driving circuit 340 further includes: a first capacitance C1;
the first capacitor C1 has a first end electrically connected to the first terminal of the first SCR1 and a second end electrically connected to the second terminal of the first SCR 1.
The first capacitor C1 is connected in parallel with the first SCR1 for filtering the high frequency signal generated during the switching process K.
In one embodiment, as shown in fig. 6, the second valve driving circuit 350 includes: a second optical coupler OC2, a second silicon controlled rectifier SCR2, a third resistor R3 and a fourth resistor R4;
an anode of a transmitting end of the second optical coupler OC2 is used for being electrically connected with a working power supply, a cathode of the transmitting end is electrically connected with a first control signal output end 311 of the controller 310, a first end of a receiving end of the second optical coupler OC2 is electrically connected with a first end of a third resistor R3, and a second end of a receiving end of the second optical coupler OC2 is electrically connected with a first end of a fourth resistor R4;
a gate of the second silicon controlled SCR2 is electrically connected with a first end of a receiving end of a second optocoupler OC2, a first terminal is electrically connected with a second end of a third resistor R3, and a second terminal is electrically connected with a second end of a fourth resistor R4;
the second end of the third resistor R3 is electrically connected with the first end of the coil of the second air valve 200, and the second end of the coil of the second air valve 200 is used for being electrically connected with one pole of the power supply;
the second end of the fourth resistor R4 is used to electrically connect to the other pole of the power supply.
The power supply is ac power, and if the power supply is directly connected to the circuit of the controller 310, the controller 310 may be damaged, and a second optical coupler OC2 is provided for isolating the controller 310 from the power supply. The operating power supply is a low voltage dc power supply that powers the controller 310 circuitry. When the second control signal output end 312 of the controller 310 outputs a low level, the second optical coupler OC2 is turned on, the second silicon controlled rectifier SCR2 is turned on, and the coil of the second air valve 200 is connected to the power supply circuit to be powered on, so that the second air valve 200 works. The third resistor R3 and the fourth resistor R4 are voltage dividing resistors, and after voltage outputted by the power supply is divided, the second optical coupler OC2 controls the conduction of the second silicon controlled rectifier SCR 2. Because the power supply is alternating current, the second SCR2 is a triac.
In one embodiment, as shown in fig. 7, the first valve driving circuit 340 further includes: a second capacitance C2;
the first end of the second capacitor C2 is electrically connected to the first terminal of the second SCR2, and the second end is electrically connected to the second terminal of the second SCR 2.
The second capacitor C2 is connected in parallel with the second SCR2 for filtering the high frequency signal generated during the switching process K.
In one embodiment, as shown in fig. 8, the switch circuit 320 includes: the switch K, a fifth resistor R5, a third optocoupler OC3, a sixth resistor R6 and a third capacitor C3;
the first end of the switch K is electrically connected with the cathode of the emission end of the third optical coupler OC3, and the second end of the switch K is grounded;
an anode of an emitting end of the third optical coupler OC3 is electrically connected with a first end of the fifth resistor R5, a collector 500 of a receiving end of the third optical coupler OC3 is electrically connected with a starting signal input end 314 of the controller 310, and an emitter is grounded;
a first end of the sixth resistor R6 is electrically connected with an emitter of a receiving end of the third optical coupler OC3, and a second end of the sixth resistor R6 is electrically connected with a working power supply;
the first end of the third capacitor C3 is electrically connected to the first end of the switch K, and the second end is grounded.
When the switch K is pressed, the third optical coupler OC3 is turned on, the level of the start signal input end 314 of the controller 310 is pulled low, and the controller 310 receives the start signal. The fifth resistor R5 is a current-limiting resistor, the sixth resistor R6 is a pull-up resistor, and when the third optocoupler OC3 is not turned on, the level of the start signal input end 314 of the controller 310 is pulled up.
In one embodiment, as shown in fig. 9, the current detection circuit 330 includes: the current sensor U1, a seventh resistor R7, an amplifier U2, a fourth capacitor C4 and an eighth resistor R8;
the output end of the current sensor U1 is electrically connected to the first end of the seventh resistor R7, and the input end is used for detecting the output current of the driving circuit 400;
a second end of the seventh resistor R7 is electrically connected to the positive input end of the amplifier U2;
the negative input end of the amplifier U2 is electrically connected with the output end of the amplifier U2, and the output end of the amplifier U2 is electrically connected with the current feedback signal input end 315 of the controller 310;
a first end of the fourth capacitor C4 is electrically connected to a second end of the seventh resistor R7, and a second end is grounded;
the first end of the eighth resistor R8 is electrically connected to the second end of the seventh resistor R7, and the second end is grounded.
The current sensor U1 can sense the information of the current to be measured, and can convert the detected information into an electric signal meeting certain standard requirements or information in other required forms to be output according to certain rules, so as to meet the requirements of information transmission, processing, storage, display, recording, control and the like. The current sensor U1 is based on different measurement principles, and can be mainly divided into: shunts, electromagnetic current transformers, electronic current transformers, and the like. When the arc striking is successful, the electrode 500 and the workpiece are conducted through the arc, the driving circuit 400 outputs current, the current sensor U1 inputs a sampling signal into the positive input end of the amplifier U2 through the seventh resistor R7, the sampling signal is amplified and then input to the controller 310, and the controller 310 can control the second air valve 200 to work. The fourth capacitor C4 and the eighth resistor R8 form a filter loop.
In one embodiment, as shown in fig. 10, the current detection circuit 330 further includes: an adjustable resistor R9;
the first end of the adjustable resistor R9 is electrically connected with the output end of the current sensor U1, and the second end is electrically connected with the first end of the seventh resistor R7.
Adjusting the adjustable resistor R9 can change the detection accuracy of the current detection circuit 330.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A plasma cutting machine comprises an electrode, a cutting head and a cutting head, wherein the electrode is used for generating a high-voltage electric field to ionize ion gas; it is characterized by also comprising:
the first gas valve is used for outputting gas at a first gas pressure;
the second air valve is used for outputting air at a second air pressure, and the first air pressure is smaller than the second air pressure;
the driving circuit is used for driving the electrodes to generate a high-voltage electric field;
the control circuit is used for outputting a first control signal and a driving signal when receiving a starting signal, wherein the first control signal is used for driving the first air valve to work, and the driving signal is used for controlling the driving circuit to work; and the second control signal is used for driving the second air valve to work when the output current of the driving circuit is detected.
2. The plasma cutter of claim 1, wherein the control circuit comprises:
the switch circuit is used for outputting a starting signal when receiving the starting signal input by a user;
the current detection circuit is used for outputting a current feedback signal when detecting that the driving circuit outputs current;
the controller is electrically connected with the switch circuit and the current detection circuit and is used for outputting a first control signal when receiving the starting signal; the current feedback circuit is also used for outputting a second control signal when receiving the current feedback signal;
the first air valve driving circuit is electrically connected with the controller and is used for driving the first air valve to be opened when the first control signal is received;
and the second air valve driving circuit is electrically connected with the controller and is used for driving the second air valve to be opened when receiving the second control signal.
3. The plasma cutter of claim 2, wherein the control circuit further comprises:
and the delay control circuit is used for outputting a delay control signal to the second air valve driving circuit when the controller stops outputting the second control signal, and the delay control signal is used for controlling the second air valve driving circuit to be switched off in a delay way.
4. The plasma cutter of claim 3, wherein the first air valve drive circuit comprises: the circuit comprises a first optocoupler, a first silicon controlled rectifier, a first resistor and a second resistor;
the anode of the transmitting end of the first optical coupler is used for being electrically connected with a working power supply, the cathode of the transmitting end is electrically connected with the first control signal output end of the controller, the first end of the receiving end of the first optical coupler is electrically connected with the first end of the first resistor, and the second end of the receiving end of the first optical coupler is electrically connected with the first end of the second resistor;
the gate of the first controllable silicon is electrically connected with the first end of the first optocoupler receiving end, the first terminal is electrically connected with the second end of the first resistor, and the second terminal is electrically connected with the second end of the second resistor;
the second end of the first resistor is electrically connected with the first end of the coil of the first air valve, and the second end of the coil of the first air valve is used for being electrically connected with one pole of a power supply;
and the second end of the second resistor is used for being electrically connected with the other pole of the power supply.
5. The plasma cutter of claim 4, wherein the first air valve drive circuit further comprises: a first capacitor;
the first end of the first capacitor is electrically connected with the first terminal of the first controllable silicon, and the second end of the first capacitor is electrically connected with the second terminal of the first controllable silicon.
6. The plasma cutter of claim 3, wherein the second gas valve drive circuit comprises: the second optical coupler, the second silicon controlled rectifier, the third resistor and the fourth resistor;
the anode of the transmitting end of the second optical coupler is used for being electrically connected with a working power supply, the cathode of the transmitting end is electrically connected with the first control signal output end of the controller, the first end of the receiving end of the second optical coupler is electrically connected with the first end of the third resistor, and the second end of the receiving end of the second optical coupler is electrically connected with the first end of the fourth resistor;
a gate of the second controllable silicon is electrically connected with a first end of the second optocoupler receiving end, a first terminal is electrically connected with a second end of the third resistor, and a second terminal is electrically connected with a second end of the fourth resistor;
the second end of the third resistor is electrically connected with the first end of the coil of the second air valve, and the second end of the coil of the second air valve is used for being electrically connected with one pole of a power supply;
and the second end of the fourth resistor is used for being electrically connected with the other pole of the power supply.
7. The plasma cutter of claim 6, wherein the first air valve drive circuit further comprises: a second capacitor;
and the first end of the second capacitor is electrically connected with the first terminal of the second controllable silicon, and the second end of the second capacitor is electrically connected with the second terminal of the second controllable silicon.
8. The plasma cutter of claim 3, wherein the switching circuit comprises: the switch, a fifth resistor, a third optocoupler, a sixth resistor and a third capacitor;
the first end of the switch is electrically connected with the cathode of the emitting end of the third optocoupler, and the second end of the switch is grounded;
an anode of the transmitting end of the third optocoupler is electrically connected with a first end of the fifth resistor, a collector of the receiving end of the third optocoupler is electrically connected with a starting signal input end of the controller, and an emitter is grounded;
a first end of the sixth resistor is electrically connected with an emitter of the receiving end of the third optocoupler, and a second end of the sixth resistor is electrically connected with a working power supply;
the first end of the third capacitor is electrically connected with the first end of the switch, and the second end of the third capacitor is grounded.
9. The plasma cutter according to claim 3, wherein the current detection circuit comprises: the current sensor, the seventh resistor, the amplifier, the fourth capacitor and the eighth resistor;
the output end of the current sensor is electrically connected with the first end of the seventh resistor, and the input end of the current sensor is used for detecting the output current of the driving circuit;
a second end of the seventh resistor is electrically connected to the positive input end of the amplifier;
the negative input end of the amplifier is electrically connected with the output end of the amplifier, and the output end of the amplifier is electrically connected with the current feedback signal input end of the controller;
the first end of the fourth capacitor is electrically connected with the second end of the seventh resistor, and the second end of the fourth capacitor is grounded;
and the first end of the eighth resistor is electrically connected with the second end of the seventh resistor, and the second end of the eighth resistor is grounded.
10. The plasma cutter of claim 9, wherein the current detection circuit further comprises: an adjustable resistor;
the first end of the adjustable resistor is electrically connected with the output end of the current sensor, and the second end of the adjustable resistor is electrically connected with the first end of the seventh resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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