CN114406424B - Cutting torch protection method and device - Google Patents
Cutting torch protection method and device Download PDFInfo
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- CN114406424B CN114406424B CN202210087002.3A CN202210087002A CN114406424B CN 114406424 B CN114406424 B CN 114406424B CN 202210087002 A CN202210087002 A CN 202210087002A CN 114406424 B CN114406424 B CN 114406424B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K10/00—Welding or cutting by means of a plasma
- B23K10/006—Control circuits therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/006—Safety devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/22—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-emitting devices, e.g. LED, optocouplers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
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Abstract
The invention belongs to the technical field of plasma cutting, and particularly relates to a cutting torch protection method and a cutting torch protection device, which comprise a first voltage signal between an electrode and a nozzle, a second voltage signal between the electrode and a workpiece, and a third current signal between the electrode and the workpiece, wherein the first voltage signal is acquired; preprocessing the collected first voltage signal, the collected second voltage signal and the collected third current signal; performing strong electromagnetic isolation on the preprocessed first voltage signal, the preprocessed second voltage signal and the preprocessed third current signal; separating the strong electromagnetic isolated first voltage signal into a first alternating current and a first direct current; judging the working state of the cutting torch according to the third current signal; according to the change of the first alternating current and the first direct current of the first voltage signal, the alarm operation is carried out in combination with the second voltage signal; the alarm operation comprises controlling the LED to flash and turning off the plasma power supply. The invention can be suitable for cutting torches of different models, and has strong anti-interference capability and convenient use.
Description
Technical Field
The invention belongs to the technical field of plasma cutting, and particularly relates to a cutting torch protection method and device.
Background
The plasma cutting machine is a machine for cutting and processing metal by adopting plasma arcs, the plasma cutting torch is an important component on the plasma cutting machine, when the machine works, the high-temperature and high-pressure plasma arcs are sprayed out from the cutting torch, and an electrode and a nozzle in the cutting torch are easy to damage, thereby belonging to a consumable part. When the electrode and the nozzle are about to be exhausted, the electrode and the nozzle need to be shut down and replaced in time, otherwise the cutter and the main machine are damaged, and the workpiece is possibly scrapped.
In this regard, plasma cutting machine manufacturers have designed cutter detection circuits within the machines, but such methods are effective only for certain types of machines and have poor interference rejection. Some existing external cutting torch protectors need to be set according to different types and cutting tool models by a user before use, and are complex and tedious in use.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the cutting torch protector aims at solving the problems that the existing cutting torch protector is weak in anti-interference capability and needs to set parameters.
The technical scheme adopted by the invention for solving the technical problems is as follows: the invention discloses a cutting torch protection method, which comprises the following steps:
s1, collecting a first voltage signal between an electrode and a nozzle, a second voltage signal between the electrode and a workpiece, and a third current signal between the electrode and the workpiece;
s2, preprocessing the collected first voltage signal, the collected second voltage signal and the collected third current signal;
s3, performing strong electromagnetic isolation on the preprocessed first voltage signal, the preprocessed second voltage signal and the preprocessed third current signal;
s4, separating the first voltage signal subjected to strong electromagnetic isolation into a first alternating current and a first direct current; the first alternating current is an alternating current part for processing a first voltage signal between the electrode and the nozzle by adopting a frequency selection circuit, and the first direct current is a direct current part for processing the voltage signal between the electrode and the nozzle by adopting an amplifying circuit;
s5, judging the working state of the cutting torch according to the third current signal, if the working state is normal, executing S6, and if the working state is abnormal, executing S1;
s6, obtaining whether the electrode or the nozzle is about to be exhausted or not by combining a second voltage signal according to the change of the first alternating current and the first direct current of the first voltage signal; if the electrode or nozzle is about to be exhausted, executing step S7; if the electrode and the nozzle are normal, executing the step S8;
s7, performing alarm operation; the alarm operation comprises controlling the LED to flash and turning off the plasma power supply;
and S8, carrying out normal operation and outputting a working signal.
Further, in S2, a debounce algorithm is adopted for the preprocessing; the de-jitter algorithm collects the first voltage signal value, the second voltage signal value and the third current signal value 10 times every millisecond, and the average calculation is carried out respectively to obtain 1 effective value.
Furthermore, the strong electromagnetic isolation adopts an optical coupling isolation pressure-separating plate or a Hall element to isolate strong electromagnetic signals generated when the cutting torch works.
Further, in S5, determining the operating state of the torch according to the third current signal includes:
when the current signal between the electrode and the workpiece is more than 35A, the working state is normal;
when the current signal between the electrode and the workpiece is less than 35A, the working state is abnormal.
Further, in S6, the determining, by the single chip microcomputer, whether the electrode or the nozzle is about to be exhausted includes:
when the first alternating current, the first direct current and the electric second voltage signals of the first voltage signals are unstable, the electrode or the nozzle is exhausted;
when the first alternating current, the first direct current and the electric second voltage signals of the first voltage signal are stable, the electrode or the nozzle works normally.
Further, in S4, the frequency selecting circuit includes a band-pass filter circuit, a monostable circuit, and a phase-locked circuit.
A torch protection device, comprising:
the acquisition module is used for acquiring a first alternating current and a first direct current in voltage signals between the electrode and the nozzle, a second voltage signal between the electrode and the workpiece and a third current signal between the electrode and the workpiece;
the isolation module is used for isolating strong electromagnetic signals generated by the cutting torch during arc striking;
the processing module is used for respectively processing an alternating current part and a direct current part of the voltage signal between the collecting electrode and the nozzle;
the single chip microcomputer is used for judging the working state of the cutting torch or judging whether the electrode or the nozzle is about to be exhausted or not according to the received corresponding signal and sending a corresponding instruction;
the control module is used for controlling the plasma power supply to close the PWM signal according to the instruction sent by the singlechip;
the alarm module is used for controlling the LED to flash and giving an alarm according to the instruction sent by the singlechip;
the signal receiving module is used for receiving the instruction sent by the upper computer and sending the instruction to the single chip microcomputer;
and the signal sending module is used for receiving the signal processed by the single chip microcomputer and sending the signal to the cloud.
Further, the signal sending module is a 4G module, and the 4G module sends the data processed by the single chip microcomputer to a cloud end.
Furthermore, the signal receiving module is provided with an RS485 interface reserved on the single chip microcomputer and used for communicating with an upper computer, and when receiving an inquiry code of the upper computer, the single chip microcomputer sends out a corresponding response code.
The invention has the beneficial effects that: the cutting torch protecting method and device provided by the invention have the advantages that the voltage signal between the electrode and the nozzle and the voltage signal between the electrode and the workpiece are transmitted in a single direction through the optical coupling isolation pressing plate, the optical coupling isolation pressing plate plays a role in isolating a strong electromagnetic signal generated during the operation of the cutting torch, so that the electrical isolation between an input voltage signal and an output end is completely realized, the input signal is not influenced by an output signal, the anti-interference capability is strong, and the operation is stable. The Hall element is connected behind the current signal between the electrode and the workpiece, and can also play a role in isolating other electromagnetic signals.
The singlechip receives the electrode or the nozzle that processing module output is about to exhaust the signal, LED scintillation in the singlechip control warning module, the simultaneous control plasma power supply closes the PWM signal, the cutting torch is with regard to the stop work, play the guard action, it is equipped with the 4G module to have increased on the singlechip additional, data transmission to the high in the clouds through the 4G module, reserve the RS485 interface on the singlechip, communicate with the host computer, be convenient for realize at the threading, application scope is wider, it is more convenient during the use, has stronger practicality.
Drawings
The invention is further illustrated by the following examples in conjunction with the drawings.
FIG. 1 is a flow diagram of a method for torch protection according to a first embodiment of the invention;
FIG. 2 is a schematic diagram of a torch protection arrangement according to a second embodiment of the invention;
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The first embodiment of the invention relates to a cutting torch protection method, in the embodiment, firstly, collecting a voltage signal between an electrode and a nozzle, a voltage signal between the electrode and a workpiece, and a current signal between the electrode and the workpiece, isolating a strong electromagnetic signal by an optical coupler isolation pressure-dividing plate or a Hall element, inputting the strong electromagnetic signal into a singlechip and controlling the cutting torch to enter a working state or a standby state according to the magnitude of the current signal between the electrode and the workpiece; according to voltage signals between the collecting electrode and the nozzle and voltage signals between the electrode and the workpiece, whether the electrode or the nozzle is about to be exhausted is judged, when the electrode or the nozzle is about to be exhausted, the LED is controlled to flicker, a protection signal is output, the application range is wide, the anti-interference capability is strong, the use is more convenient, and the practicability is high.
The implementation details of the torch protection method of the present embodiment are specifically described below, the following are provided only for facilitating understanding of the implementation details, and are not necessary for implementing the present embodiment, and a specific flow of the present embodiment is shown in fig. 1:
s1, collecting a first voltage signal between an electrode and a nozzle, a second voltage signal between the electrode and a workpiece, and a third current signal between the electrode and the workpiece;
specifically, a voltage signal between the electrode and the nozzle is measured as a first voltage signal, a voltage signal between the electrode and the workpiece is measured as a second voltage signal, and a current signal between the electrode and the workpiece is measured as a third current signal.
S2, preprocessing the acquired first voltage signal, the acquired second voltage signal and the acquired third current signal;
specifically, the preprocessing mode adopts a debouncing algorithm; in the debouncing algorithm, a first voltage signal value, a second voltage signal value and a third current signal value are respectively acquired for 10 times every millisecond, and averaging calculation is respectively carried out to obtain 1 effective value.
S3, performing strong electromagnetic isolation on the preprocessed first voltage signal, the preprocessed second voltage signal and the preprocessed third current signal;
specifically, the strong electromagnetic isolation adopts an optical coupling isolation pressure-splitting plate or a Hall element to isolate a strong electromagnetic signal generated when the cutting torch works. Insert the isolated pressure divider of opto-coupler after the second voltage signal between first voltage signal between electrode and the nozzle and electrode and work piece respectively, the isolated pressure divider of opto-coupler has adopted traditional HCNR200 type linear opto-coupler circuit, presses 100 with first voltage signal and second voltage signal respectively: the proportion of 1 steps down, because the opto-coupler is unidirectional transmission, the signal also is unidirectional transmission, and the opto-coupler plays the strong electromagnetic signal's that keeps apart the cutting torch during operation production effect, consequently makes input voltage signal and output realized electrical isolation completely, and output signal does not cause the influence to input signal, and the interference killing feature is strong, job stabilization, and the optically coupled isolation bleeder plate also can play the conversion of level. The Hall element is connected after a third current signal between the electrode and the workpiece, the Hall element can also play a role in isolating other electromagnetic signals, and signals output by the Hall element can be directly output to the singlechip.
S4, separating the first voltage signal subjected to strong electromagnetic isolation into a first alternating current and a first direct current; the first alternating current is an alternating current part for processing a first voltage signal between the electrode and the nozzle by adopting a frequency selection circuit, and the first direct current is a direct current part for processing the voltage signal between the electrode and the nozzle by adopting an amplifying circuit;
specifically, a first voltage signal between an electrode and a nozzle is accessed into a frequency selection circuit, the frequency selection circuit comprises a band-pass filter circuit, a monostable circuit and a phase-locked circuit, an alternating current signal in the first voltage signal between the electrode and the nozzle is processed through the frequency selection circuit, an alternating current small signal between the electrode and the nozzle is selected, and the frequency is between 10 Hz and 2000 Hz and is a first alternating current. The first voltage signal between the electrode and the nozzle is connected into an amplifying circuit, the amplifying circuit processes the direct current signal of the first voltage signal between the electrode and the nozzle, the direct current signal between the electrode and the nozzle is amplified in proportion to be a first direct current, and a signal which can be read by a single chip microcomputer is output.
Step S5, judging the working state of the cutting torch according to the third current signal, if the working state is normal, executing step S6, and if the working state is abnormal, executing step S1;
specifically, the method for judging the working state of the cutting torch according to the value of the third current signal comprises the following steps:
when the current signal between the electrode and the workpiece is more than 35A, the working state is normal;
when the current signal between the electrode and the workpiece is less than 35A, the working state is abnormal.
S6, according to the change of the first alternating current and the first direct current of the first voltage signal, combining with a second voltage signal, obtaining whether the electrode or the nozzle is about to be exhausted; if the electrode or nozzle is about to be exhausted, executing step S7; if the electrode and the nozzle are normal, executing the step S8;
specifically, whether the electrode or the nozzle is about to be exhausted refers to the degree of wear of the electrode or the nozzle, and when the degree of wear reaches a preset value, it is determined that the electrode or the nozzle is about to be exhausted, and at this time, the single chip microcomputer determines whether the electrode or the nozzle is about to be exhausted, including:
when the first alternating current, the first direct current and the electric second voltage signals of the first voltage signals are unstable, the electrode or the nozzle is exhausted;
when the first alternating current, the first direct current and the electrical second voltage signal of the first voltage signal are stable, the electrode or the nozzle works normally.
S7, performing alarm operation; the alarm operation comprises controlling the LED to flicker and turning off the plasma power supply;
specifically, the singlechip receives an imminent exhaustion signal of an output electrode or a nozzle; the LED of the single chip microcomputer controller flickers, and simultaneously controls the plasma power supply to close the PWM signal, namely the plasma power supply output is closed, and the cutting torch stops working.
And S8, performing normal operation and outputting a working signal.
The voltage signal between the electrode and the nozzle and the voltage signal between the electrode and the workpiece are transmitted in a single direction by the optical coupler isolation pressing plate, and the optical coupler plays a role in isolating a strong electromagnetic signal generated when the cutting torch works, so that the input voltage signal is completely electrically isolated from the output end, the output signal does not influence the input signal, the anti-interference capability is strong, and the operation is stable. The Hall element is connected after the current signal between the electrode and the workpiece, and the Hall element can also play a role in isolating other electromagnetic signals. The singlechip receives the signal that the output electrode or the nozzle is about to exhaust, and singlechip controller LED flicker controls plasma power supply to close the PWM signal simultaneously, and the cutting torch just stops working, plays the guard action, and is more convenient during the use, has stronger practicality.
The steps of the above methods are divided for clarity, and the implementation may be combined into one step or split some steps, and the steps are divided into multiple steps, so long as the same logical relationship is included, which are within the scope of the present patent; it is within the scope of this patent to add minor modifications to the process or to introduce minor design changes, but not to change the core design of the algorithm and process.
As shown in fig. 2, a second embodiment of the present invention relates to a torch protection apparatus, including: the system comprises an acquisition module 201, an isolation module 202, a processing module 203, a singlechip 204, a control module 205, an alarm module 206, a signal receiving module 207 and a signal sending module 208.
Specifically, the acquisition module 201 is configured to acquire a first alternating current and a first direct current in voltage signals between the electrode and the nozzle, a second voltage signal between the electrode and the workpiece, and a third current signal between the electrode and the workpiece; the isolation module 202 is used for isolating strong electromagnetic signals generated by the cutting torch during arc starting; the processing module 203 is used for respectively processing an alternating current part and a direct current part of the voltage signal between the collecting electrode and the nozzle; the single chip microcomputer 204 is characterized in that a chip of the single chip microcomputer adopts an STC89C52RC single chip microcomputer, a first voltage signal between an electrode and a nozzle is divided into a first direct current and a first alternating current, a second voltage signal between the electrode and a workpiece and a third current signal between the electrode and the workpiece are respectively stored in a register of the single chip microcomputer 204 to serve as a reference so as to prevent data loss, data in the register are refreshed once every 10 seconds, an average value of 8 times of the data is obtained, and the single chip microcomputer 204 is used for judging the working state of the cutting torch or judging whether the electrode or the nozzle is about to be exhausted according to the received corresponding signals and sending corresponding instructions; the control module 205 is used for controlling the plasma power supply to close the PWM signal according to the instruction sent by the singlechip 204; the alarm module 206 is used for controlling the LED to flash and giving an alarm according to the instruction sent by the singlechip 204; the signal receiving module 207 reserves an RS485 interface for the singlechip 204, the baud rate is 19200, the communication protocol is ModeBus-RTU, the signal receiving module is communicated with the upper computer and used for receiving an inquiry code of the upper computer and sending a corresponding response code through the singlechip 204; the signal sending module 208 is a 4G module, and is configured to send the data processed by the single chip microcomputer 204 to a cloud.
It should be understood that this embodiment is a system example corresponding to the first embodiment, and may be implemented in cooperation with the first embodiment. The related technical details mentioned in the first embodiment are still valid in this embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the first embodiment.
Compared with the prior art, the cutting torch protection device provided by the embodiment firstly collects a first alternating current and a first direct current in a first voltage signal between an electrode and a nozzle, a second voltage signal between the electrode and a workpiece and a third current signal between the electrode and the workpiece through the collection module 201, transmits the first alternating current and the first direct current to the isolation module 202, isolates an interference signal, outputs the interference signal to the processing module 203, processes an alternating current part and a direct current part in the first voltage signal between the electrode and the nozzle, outputs the alternating current part and the direct current part to the single chip microcomputer 204, carries out judgment processing through the single chip microcomputer 204, receives and sends a corresponding instruction, and the single chip microcomputer 204 sends a corresponding instruction to the control module 205 to control the plasma power supply to close a PWM signal. The single chip microcomputer 204 sends a corresponding instruction to the alarm module 206, controls the LED to flicker and gives an alarm, the upper computer sends the instruction to the single chip microcomputer 204 to the signal receiving module 207, and the single chip microcomputer 204 outputs the instruction to the cloud end through the signal sending module 208.
It should be noted that each module referred to in this embodiment is a logical module, and in practical applications, one logical unit may be one physical unit, may be a part of one physical unit, and may be implemented by a combination of multiple physical units. In addition, in order to highlight the innovative part of the present invention, elements that are not so closely related to solving the technical problems proposed by the present invention are not introduced in the present embodiment, but this does not indicate that other elements are not present in the present embodiment.
In light of the foregoing description of preferred embodiments in accordance with the invention, it is to be understood that numerous changes and modifications may be made by those skilled in the art without departing from the scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (8)
1. A method for torch protection, comprising:
s1, collecting a first voltage signal between an electrode and a nozzle, a second voltage signal between the electrode and a workpiece, and a third current signal between the electrode and the workpiece;
s2, preprocessing the collected first voltage signal, the collected second voltage signal and the collected third current signal;
s3, performing strong electromagnetic isolation on the preprocessed first voltage signal, the preprocessed second voltage signal and the preprocessed third current signal;
s4, separating the first voltage signal subjected to strong electromagnetic isolation into a first alternating current and a first direct current; the first alternating current is an alternating current part for processing a first voltage signal between the electrode and the nozzle by adopting a frequency selection circuit, and the first direct current is a direct current part for processing the voltage signal between the electrode and the nozzle by adopting an amplifying circuit;
s5, judging the working state of the cutting torch according to the third current signal, if the working state is normal, executing S6, and if the working state is abnormal, executing the step S1;
s6, according to the change of the first alternating current and the first direct current of the first voltage signal, combining a second voltage signal, and obtaining whether the electrode or the nozzle is about to be exhausted; if the electrode or nozzle is about to be exhausted, executing step S7; if the electrode and the nozzle are normal, executing the step S8;
s7, performing alarm operation; the alarm operation comprises controlling the LED to flash and turning off the plasma power supply;
s8, performing normal operation and outputting a working signal;
in S4, a first voltage signal between the electrode and the nozzle is accessed to a frequency selection circuit, the frequency selection circuit comprises a band-pass filter circuit, a monostable circuit and a phase-locked circuit, the frequency selection circuit processes an alternating current signal in the first voltage signal between the electrode and the nozzle, and selects an alternating current small signal between the electrode and the nozzle, wherein the frequency is between 10 Hz and 2000 Hz and is a first alternating current; the first voltage signal between the electrode and the nozzle is connected into the amplifying circuit, the amplifying circuit processes the direct current signal of the first voltage signal between the electrode and the nozzle, the direct current signal between the electrode and the nozzle is amplified in proportion to be a first direct current, and a signal which can be read by the single chip microcomputer is output.
2. The torch protection method of claim 1, wherein in S2, the preprocessing employs a debounce algorithm; the de-jitter algorithm collects the first voltage signal value, the second voltage signal value and the third current signal value 10 times every millisecond, and the average calculation is carried out respectively to obtain 1 effective value.
3. The cutting torch protection method according to claim 1, wherein in S3, the strong electromagnetic isolation adopts an optical coupling isolation pressure-separating plate or a Hall element to isolate a strong electromagnetic signal generated when the cutting torch works.
4. The torch protection method of claim 1, wherein the determining the operating state of the torch according to the third current signal in S5 comprises:
when the current signal between the electrode and the workpiece is more than 35A, the working state is normal;
when the current signal between the electrode and the workpiece is less than 35A, the working state is abnormal.
5. The cutting torch protection method according to claim 1, wherein in S6, the single chip microcomputer determining whether an electrode or a nozzle is about to be exhausted comprises:
when the first alternating current, the first direct current and the electric second voltage signals of the first voltage signals are unstable, the electrode or the nozzle is exhausted;
when the first alternating current, the first direct current and the electric second voltage signals of the first voltage signal are stable, the electrode or the nozzle works normally.
6. A torch protection apparatus, wherein the torch protection apparatus, when executed, performs the torch protection method of claim 1, the torch protection apparatus comprising:
the acquisition module is used for acquiring a first alternating current and a first direct current in voltage signals between the electrode and the nozzle, a second voltage signal between the electrode and the workpiece and a third current signal between the electrode and the workpiece;
the isolation module is used for isolating strong electromagnetic signals generated by the cutting torch during arcing;
the processing module is used for respectively processing an alternating current part and a direct current part of a voltage signal between the collecting electrode and the nozzle;
the single chip microcomputer is used for judging the working state of the cutting torch or judging whether the electrode or the nozzle is about to be exhausted according to the received corresponding signal and sending a corresponding instruction;
the control module is used for controlling the plasma power supply to close the PWM signal according to the instruction sent by the singlechip;
the alarm module is used for controlling the LED to flash and giving an alarm according to the instruction sent by the singlechip;
the signal receiving module is used for receiving the instruction sent by the upper computer and sending the instruction to the single chip microcomputer;
the signal sending module is used for receiving the signal processed by the single chip microcomputer and sending the signal to the cloud end;
the frequency selection circuit is used for processing an alternating current signal in the first voltage signal between the electrode and the nozzle, selecting an alternating current small signal between the electrode and the nozzle, and setting the frequency between 10 Hz and 2000 Hz as a first alternating current; the first voltage signal between the electrode and the nozzle is connected into the amplifying circuit, the amplifying circuit processes the direct current signal of the first voltage signal between the electrode and the nozzle, the direct current signal between the electrode and the nozzle is amplified in proportion to be a first direct current, and a signal which can be read by the single chip microcomputer is output.
7. The cutting torch protection device according to claim 6, wherein the signal sending module is a 4G module, and the 4G module sends data processed by the single chip microcomputer to a cloud.
8. The cutting torch protecting device as set forth in claim 6, characterized in that the signal receiving module reserves an RS485 interface for the single chip microcomputer for communicating with the upper computer, and the single chip microcomputer sends out a corresponding response code when receiving an inquiry code from the upper computer.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5844196A (en) * | 1997-09-15 | 1998-12-01 | The Esab Group, Inc. | System and method for detecting nozzle and electrode wear |
| CN206598001U (en) * | 2017-02-21 | 2017-10-31 | 上海通用重工集团有限公司 | Transfevent plasma arc generating means |
| GB2565083A (en) * | 2017-07-31 | 2019-02-06 | Linde Ag | Device and method for plasma cutting of work pieces |
| CN108372349B (en) * | 2018-03-07 | 2023-06-30 | 上海威特力焊接设备制造股份有限公司 | Electric shock protection device and method for plasma cutting machine |
| CN111822831B (en) * | 2020-07-21 | 2022-10-04 | 常州九圣焊割设备股份有限公司 | Real-time detection method for consumable part of plasma cutting machine |
| CN112453665A (en) * | 2020-12-22 | 2021-03-09 | 无锡马斯克焊割设备有限公司 | Plasma arc detection method applied to plasma cutting machine |
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