CN208276335U - A kind of transferred arc inversion plasma cutting machine of non-high frequency control - Google Patents
A kind of transferred arc inversion plasma cutting machine of non-high frequency control Download PDFInfo
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- CN208276335U CN208276335U CN201820897336.6U CN201820897336U CN208276335U CN 208276335 U CN208276335 U CN 208276335U CN 201820897336 U CN201820897336 U CN 201820897336U CN 208276335 U CN208276335 U CN 208276335U
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Abstract
The utility model provides a kind of transferred arc inversion plasma cutting machine of non-high frequency control, belongs to welding technology field.It solves the problems, such as that the use of existing plasma cutting machine is easy to be restricted.The transferred arc inversion plasma cutting machine of this non-high frequency control, including by power input, current rectifying and wave filtering circuit, inverter circuit, the major loop of main transformer decompression isolation and secondary current rectifying and wave filtering circuit composition, electric current is after main transformer decompression isolation and secondary current rectifying and wave filtering circuit respectively by current feedback to control system, PWM control is transmitted a signal to by control system, PWM control adjusts the inverter circuit in major loop according to the signal that control system is transmitted with driving circuit, the cutting machine further includes the nozzle and cutting gun connecting with major loop, the connection of the negative electrode of nozzle and major loop, the electrode that cutting gun draws an arc maintenance end on the basis of positive electrode is connect with cutting gun, it is connected with minor arc arc maintenance identification circuit between arc maintenance end and major loop and is controlled by control system.
Description
Technical field
The utility model belongs to welding technology field, is related to a kind of cutting machine, in particular to a kind of turn of non-high frequency control
Move arc inversion plasma cutting machine.
Background technique
Plasma cut is ionized as medium by DC high-voltage power supply using compressed air either compressed nitrogen etc.
Flame passes are formed, for cutting metal from cutting gun mouth high speed ejection at plasma.Current contravariant plasma is cut
Cutting mill generallys use contacting ignition arc and non-contact striking two ways establishes electric arc: nozzle is necessary when contacting ignition arc mode striking
With workpiece short circuit, the striking on the workpiece for having spot and rusty stain of this mode is difficult, is covered with the metal of insulating protective film on surface
Plate can hardly be cut, and nozzle is easy to damage.
Existing general plasma cutting machine must cut plasma arc by high-frequency and high-voltage to ignite.Since main transformer is deposited
There is high frequency in leakage inductance and striking, so the electromagnetic radiation of cutting machine is very serious, seriously affects the quality and related work of power grid
The physical and mental health of personnel.In addition, it is dry also to generate serious electromagnetism to other electronic components of periphery using high-frequency and high-voltage striking
It disturbs.Therefore, it is very restricted the use of the plasma cutting machine using high-frequency and high-voltage striking, is not useable for dry to electromagnetism
Disturb sensitive environment and automation cutting field.And ignited using non-high frequency and cut plasma arc control method, it can effectively solve
Certainly above-mentioned technical problem.
Summary of the invention
The purpose of this utility model is provided a kind of using non-high frequency for the above-mentioned problems in the prior art
The inversion plasma cutting machine that the moment arc transfer that front guide arc control technology is separated using electrode with nozzle to workpiece is realized.
The purpose of this utility model can be realized by the following technical scheme: a kind of transferred arc inversion etc. of non-high frequency control
Ion cutting machine, including by power input, a current rectifying and wave filtering circuit, inverter circuit, main transformer decompression isolation and it is secondary whole
The major loop of filter circuit composition is flowed, electric current is after main transformer decompression isolation and secondary current rectifying and wave filtering circuit respectively by electric current
Control system is fed back to, PWM control is transmitted a signal to by control system, the PWM control is transmitted according to control system
Signal the inverter circuit in major loop is adjusted with driving circuit, which further includes the nozzle connecting with the major loop
And cutting gun, which is characterized in that the negative electrode of the nozzle and major loop connects, and the cutting gun is on the basis of positive electrode
The upper electrode for drawing an arc maintenance end is connect with cutting gun, and the identification of minor arc arc maintenance is connected between the arc maintenance end and major loop
Circuit is simultaneously controlled by control system.
The principle of the transferred arc inversion plasma cutting machine of this non-high frequency control are as follows: air-flow and electricity are controlled by control system
Positive electrode and nozzle are converted to non-shorting state by short-circuit condition by stream, and small arc i.e. front guide arc is formed between arc maintenance end and nozzle,
Cutting minor arc is re-formed when nozzle is close to workpiece.Non-contact striking mode is contacted without nozzle and workpiece, and the electrode of nozzle connects
The negative electrode of major loop, workpiece connect positive electrode, then draw one on the basis of positive electrode and the electrode at arc maintenance end is made to be connected to cutting
On rifle.Such electrical connection can pass through gas flow optimized in the case where cutting gun not contact workpiece between electrode and nozzle
First establish a stable electric arc, at this time cutting machine export smaller current, guarantee will not scaling loss nozzle and electrode, wait until cutting gun
With workpiece apart from it is close when, electric arc is transferred between electrode and workpiece between electrode and cutting gun, and at this moment cutting machine just exports setting
Cutting high current, complete the striking stabilising arc of electric arc and the mesh of arc transfer.
In a kind of transferred arc inversion plasma cutting machine of above-mentioned non-high frequency control, pass through gas on the cutting gun
Body pressure reducing valve is provided with one big solenoid valve and a small solenoid valve, and is controlled by control system.
Using the conducting of one small solenoid valve control air-flow, pass through the stream of Electromagnetic Control gas using another big solenoid valve
Amount and pressure realize the switching of minor arc and front guide arc state with electronic switch.When front guide arc state, small electromagnetic valve work, electromagnetism
Valve releases a certain amount of gas, and input cutting gun is little airflow；When minor arc state, small solenoid valve is closed, big solenoid valve work
Make, input cutting gun is big air-flow.At the end of cutting, electrode and nozzle are still in the condition of high temperature, small electromagnetic valve work, fastly
Fast cooling nozzles extend the service life of electrode and nozzle.
In a kind of transferred arc inversion plasma cutting machine of above-mentioned non-high frequency control, the control system passes through control
Panel processed is controlled to constant current and back ground current.
Compared with prior art, this transferred arc inversion plasma cutting machine has the electromagnetic interference generated and radiation smaller,
And nozzle the advantages of the service life is longer.
Detailed description of the invention
Fig. 1 is the schematic block circuit diagram of this cutting machine.
Specific embodiment
It is specific embodiment of the utility model and in conjunction with attached drawing below, the technical solution of the utility model is made further
Description, but the utility model is not limited to these examples.
As shown in Figure 1, the transferred arc inversion plasma cutting machine of this non-high frequency control includes by power input, primary rectification
The major loop that filter circuit, inverter circuit, main transformer decompression isolation and secondary current rectifying and wave filtering circuit form, electric current pass through main transformer
Respectively by current feedback to control system after depressor decompression isolation and secondary current rectifying and wave filtering circuit, signal is passed by control system
It is defeated by PWM control, PWM control adjusts the inverter circuit in major loop according to the signal that control system is transmitted with driving circuit,
The cutting machine further includes the nozzle and cutting gun connecting with major loop, and the negative electrode connection of nozzle and major loop, cutting gun is just
The electrode that an arc maintenance end is drawn on the basis of electrode is connect with cutting gun, and minor arc arc maintenance is connected between arc maintenance end and major loop
Identification circuit is simultaneously controlled by control system, and gas pressure reducer is provided with one big solenoid valve and a small electricity on cutting gun
Magnet valve, and controlled by control system, control system is controlled by control panel to constant current and back ground current.
The course of work of this non-high frequency keep-alive circuit is as follows: inverter type plasma cutting machine front guide arc control technology mainly by
Pressure control, current detecting and PWM control composition.Pressure control passes through the conducting of solenoid valve control air-flow, will by current detecting
Required current signal feedback is controlled to PWM, and PWM control is realized by adjusting duty ratio adjusts output size of current.Striking institute
The low current needed is one wire resistor of series connection between nozzle and the positive electrode of major loop, when energized, due to non-height
Short-circuit condition is between the positive electrode and nozzle of frequency cutting gun, nozzle is made up of back wire resistor and current detection means
Road.Press plasma cutting machine switch after, major loop work, while small solenoid valve close immediately 1 second or so then it is open-minded, until
Trip switch simultaneously completes the after-blow time.When small solenoid valve is closed, positive electrode contacts with nozzle and has 12A or so electric current
Pass through, since the effect of air pressure separates positive electrode with nozzle after small solenoid valve is opened, because having between positive electrode and nozzle
The electric current of 12A is so meeting arcing when separating, high pressure gas blows out electric arc from the aperture of nozzle just forms arc maintenance, and higher
The constant-current characteristics of voltage and circuit can guarantee the stabilization of arc maintenance, and electric current is divided into two circuits, the first via after cutting gun is close to workpiece
Negative electrode, nozzle, arc maintenance end, secondary route negative electrode, workpiece to positive electrode.As long as electric current occurs in second servo loop, immediately by
Primary Ioops shutdown, and given value of current is switched to the given potentiometer of panel currents by fixing 12A, to complete striking.
Using the plasma cutting machine of this striking mode, arc process be by air-flow by between electrode and nozzle by short
Line state pushes non-shorting state open, and forms electric arc by guidance circuital current between them, to form front guide arc；Work as spray
When mouth is close to workpiece, the cutting minor arc between workpiece is formed, arc process is accurately controlled air-flow and striking electric current,
When cutting terminates, cutting gun leaves workpiece, it can be realized and be reduced rapidly output electric current and air-flow, and guarantee that front guide arc is not put out
Go out (next time cutting can smooth the starting the arc), so that principal current be avoided to be formed into a loop by nozzle and current-limiting resistance, and scaling loss nozzle and
Current-limiting resistance.
The specific embodiments described herein are merely examples of the spirit of the present invention.The utility model institute
Belonging to those skilled in the art can make various modifications or additions to the described embodiments or using similar
Mode substitute, but without departing from the spirit of the present application or beyond the scope of the appended claims.
Claims (3)
1. a kind of transferred arc inversion plasma cutting machine of non-high frequency control, including by power input, a current rectifying and wave filtering circuit,
The major loop that inverter circuit, main transformer decompression isolation and secondary current rectifying and wave filtering circuit form, electric current are depressured by main transformer
Respectively by current feedback to control system after isolation and secondary current rectifying and wave filtering circuit, PWM is transmitted a signal to by control system
Control, described PWM control adjust the inverter circuit in major loop according to the signal that control system transmit with driving circuit, this
Cutting machine further includes the nozzle and cutting gun connecting with the major loop, which is characterized in that the nozzle and major loop is born
Electrode connection, the electrode that the cutting gun draws an arc maintenance end on the basis of positive electrode is connect with cutting gun, described
It is connected with minor arc arc maintenance identification circuit between arc maintenance end and major loop and is controlled by control system.
2. a kind of transferred arc inversion plasma cutting machine of non-high frequency control according to claim 1, which is characterized in that institute
One big solenoid valve and a small solenoid valve are provided with by gas pressure reducer on the cutting gun stated, and pass through control system control
System.
3. a kind of transferred arc inversion plasma cutting machine of non-high frequency control according to claim 1, which is characterized in that institute
The control system stated is controlled by control panel to constant current and back ground current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820897336.6U CN208276335U (en) | 2018-06-11 | 2018-06-11 | A kind of transferred arc inversion plasma cutting machine of non-high frequency control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820897336.6U CN208276335U (en) | 2018-06-11 | 2018-06-11 | A kind of transferred arc inversion plasma cutting machine of non-high frequency control |
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| CN208276335U true CN208276335U (en) | 2018-12-25 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109807442A (en) * | 2018-12-28 | 2019-05-28 | 上海沪工焊接集团股份有限公司 | A kind of control method of non-high frequency plasma cutting machine |
| CN110434440A (en) * | 2019-08-29 | 2019-11-12 | 深圳市海宝等离子设备有限公司 | A kind of plasma cutting machine control circuit of built-in air compressor machine |
| CN110744174A (en) * | 2019-09-24 | 2020-02-04 | 深圳市佳士科技股份有限公司 | Arc striking identification circuit and arc striking identification method applied to cutting machine |
| CN111872532A (en) * | 2020-08-20 | 2020-11-03 | 深圳市佳士科技股份有限公司 | Cutting machine control device and low-frequency arc striking plasma cutting machine |
| CN114147320A (en) * | 2021-12-30 | 2022-03-08 | 浙江业世焊接科技有限公司 | Welding machine circuit with plasma cutting function |
| CN110744174B (en) * | 2019-09-24 | 2024-06-04 | 深圳市佳士科技股份有限公司 | Arc striking identification circuit and arc striking identification method applied to cutting machine |
-
2018
- 2018-06-11 CN CN201820897336.6U patent/CN208276335U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109807442A (en) * | 2018-12-28 | 2019-05-28 | 上海沪工焊接集团股份有限公司 | A kind of control method of non-high frequency plasma cutting machine |
| CN109807442B (en) * | 2018-12-28 | 2021-04-20 | 上海沪工焊接集团股份有限公司 | Control method of non-high-frequency plasma cutting machine |
| CN110434440A (en) * | 2019-08-29 | 2019-11-12 | 深圳市海宝等离子设备有限公司 | A kind of plasma cutting machine control circuit of built-in air compressor machine |
| CN110434440B (en) * | 2019-08-29 | 2024-06-07 | 深圳市景布科技发展有限公司 | Control circuit of plasma cutting machine with built-in air compressor |
| CN110744174A (en) * | 2019-09-24 | 2020-02-04 | 深圳市佳士科技股份有限公司 | Arc striking identification circuit and arc striking identification method applied to cutting machine |
| CN110744174B (en) * | 2019-09-24 | 2024-06-04 | 深圳市佳士科技股份有限公司 | Arc striking identification circuit and arc striking identification method applied to cutting machine |
| CN111872532A (en) * | 2020-08-20 | 2020-11-03 | 深圳市佳士科技股份有限公司 | Cutting machine control device and low-frequency arc striking plasma cutting machine |
| CN111872532B (en) * | 2020-08-20 | 2022-03-11 | 深圳市佳士科技股份有限公司 | Cutting machine control device and low-frequency arc striking plasma cutting machine |
| CN114147320A (en) * | 2021-12-30 | 2022-03-08 | 浙江业世焊接科技有限公司 | Welding machine circuit with plasma cutting function |
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