CN108372349A - Shock preventing protector of electric and method for plasma cutting machine - Google Patents
Shock preventing protector of electric and method for plasma cutting machine Download PDFInfo
- Publication number
- CN108372349A CN108372349A CN201810186900.8A CN201810186900A CN108372349A CN 108372349 A CN108372349 A CN 108372349A CN 201810186900 A CN201810186900 A CN 201810186900A CN 108372349 A CN108372349 A CN 108372349A
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- Prior art keywords
- cutting machine
- electric
- nozzle
- shock preventing
- electrode
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Classifications
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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
-
- 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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Arc Welding In General (AREA)
Abstract
The present invention discloses a kind of shock preventing protector of electric for plasma cutting machine, including：Whether detection circuit is formed into a loop between the detection circuit detecting electrode and nozzle and exports detection signal；Control unit, which receives the detection signal, and according to the detection signal enabling cutting machine or sends out alarm signal, which is used to cut off the operating current of the plasma cutting machine.Present invention simultaneously discloses a kind of electrocution-proof protection methods.
Description
Technical field
The present invention relates to plasma cutting machine technical field more particularly to a kind of protection against electric shock guarantors for plasma cutting machine
Protection unit.
Background technology
Plasma arc cutting is so that the metal local melting of workpiece incision (is steamed using the heat of high-temperature plasma electric arc
Hair), and molten metal is excluded to form a kind of processing method of notch by means of the momentum of high speed plasma.
Plasma is heated to excessive temperature and the gas by highly ionized, and arc power is transferred on workpiece by it, high
Heat makes workpiece melt and is blown off, forms the working condition of plasma arc cutting.Compressed air enters after cutting torch by gas chamber point
With two-way, that is, form plasma gas and auxiliary gas.Plasma gas arc plays fusing metal function, and gas is assisted then to cool down
The all parts of cutting torch simultaneously blow molten metal off.Plasma cut coordinates different working gas that can cut various oxygen
Cutting is difficult to the metal cut, and especially for non-ferrous metal (stainless steel, aluminium, copper, titanium, nickel), cutting effect is more preferably；It is main
When advantage is cutting thickness little metal, plasma cutting speeds are fast, especially when cutting common carbon steel sheet,
Speed up to 5~6 times of oxygen cutting method, cut surface is bright and clean, thermal deformation is small, heat affected area is few.
From the point of view of traditional cutting mode, plasma cut has many advantages, such as high efficiency, high-precision and high stability, especially
It is suitable for producing processing and hi-precision cutting requirement in enormous quantities.In addition from a cost perspective, due to eliminating cutting combustion gas
Expense, plasma cut relative cost is more economical, when being especially applied in high volume process, processing cost control
System will become apparent from.Plasma cutting machine is widely used in automobile, locomotive, pressure vessel, chemical machinery, nuclear industry, universal machine
The all trades and professions such as tool, engineering machinery, steel construction, ship.
The advantage of ion cutting machine is that plasma arc energy is more concentrated, temperature higher, cutting speed are very fast, deformation is small,
The materials such as also cleavable stainless steel, aluminium.
Cutting machine uses plasma arc, the generation of plasma arc be voltage, air pressure, magnetic field collective effect, so,
In order to arbitrarily striking and plasma arc be made not extinguish, the output requirement of cutting machine to have higher voltage (be generally 100~
600V).Compared with traditional cutting method, output voltage has reached 2~5 times of conventional method, so that the danger of output end
It is dangerous to be significantly improved.Especially in terms of personal safety, since the danger of output end improves, cutting machine operating personnel's meeting
There is larger Danger Electric shock risk, to propose a kind of method of plasma cutting machine electrocution-proof protection.
The prior art needs a kind of for plasma cutting machine shock preventing protector of electric, the life of protection cutting machine operating personnel
Life with it is healthy and safe.
Invention content
In view of this, the present invention provides a kind of shock preventing protector of electric and method for plasma cutting machine, Neng Gouyou
Whether effect detection nozzle and electrode are effectively installed to achieve the purpose that protection against electric shock.
To realize that foregoing invention target, the present invention disclose a kind of shock preventing protector of electric for plasma cutting machine, wrap
It includes：Whether detection circuit is formed into a loop between the detection circuit detecting electrode and nozzle and exports detection signal；Control unit,
The control unit receives the detection signal, and according to the detection signal enabling cutting machine or sends out alarm signal, the alarm signal
Number for cutting off the operating current of the plasma cutting machine.
Further, the first test side of the detection circuit is connect with the electrode, and the second test side is connect with the nozzle.
Further, first test side is for detecting Vout-, and second test side is for detecting Vout+1, when this
When Vout-=Vout+1, it is formed into a loop between electrode and nozzle.
Further, which includes power supply and detection signal output unit, which is should
Detection circuit power, the detection signal output unit be used for according to whether be formed into a loop between electrode and nozzle export the detection letter
Number.
Further, which is isolated power supply, which is optocoupler.
Further, which further includes resistance R31, R34, capacitance C51, C52, and diode D19, D999 should
The one end resistance R31 connection electrode, the other end connect isolated power supply, and the one end resistance R31 connects the anode of diode D19, separately
One end connects the inputing diode cathode of the optocoupler；The one end capacitance C51 connects the isolated power supply and resistance R34, and the other end connects
Connect the inputing diode anode of isolated power supply, diode D999 cathodes and optocoupler；The outlet side of capacitance C52 and optocoupler connects,
Diode D19 cathodes are connect with nozzle lead-out wire, and anode is connect with resistance R31.
Further, the voltage of the isolated power supply is 12V.
Further, which is that voltage signal starts the cutting machine, the voltage when voltage signal is 5V
When signal is 0V, the alarm signal is sent out.
Further, the detection circuit also with turn arc circuit and connect.
Present invention simultaneously discloses a kind of electrocution-proof protection methods for plasma cutting machine, including：Step 1：Detection electricity
Whether it is formed into a loop between pole and nozzle and exports detection signal；Step 2：According to the detection signal enabling cutting machine or cut-out
The operating current of the cutting machine.
Compared with prior art, the shock preventing protector of electric and method of plasma cutting machine provided by the present invention, energy
It enough detects nozzle and whether electrode is effectively installed to achieve the purpose that protection against electric shock.Detection circuit it is simple for structure, save at
This, and the occupied real space of the circuit is small, increases operating procedure, stabilization easy to use without additional.
On the other hand, whether shock preventing protector of electric provided by the present invention and method can simultaneously have nozzle and electrode
Effect installation is detected, and required time is short, reaction is fast.
Description of the drawings
Attached drawing does not constitute inappropriate limitation of the present invention for more fully understanding the present invention.Wherein：
Fig. 1 is the hardware block diagram of the shock preventing protector of electric for plasma cutting machine shown by the present invention；
Fig. 2 is the shock preventing protector of electric circuit diagram for plasma cutting machine shown by the present invention；
Fig. 3 is the schematic diagram of electric shock prevention method of the present invention.
Specific implementation mode
In the plasma cutting machine course of work, workpiece is connected with the output positive and negative anodes of cutting machine respectively with electrode, to
Electric arc is formed between workpiece and electrode.Electric arc is compressed by nozzle, to launch a big electricity of temperature height, energy density
Arc.Wherein, electrode primarily serves the effect of conduction electric current and the electric arc that ignites；Nozzle plays the role of compression arc, launches temperature
The electric arc that degree is high, energy density is big.Workpiece is connected with the output cathode of cutting machine, and electrode is connected with the output negative pole of cutting machine,
Therefore an electric arc is formed between electrode and workpiece, to achieve the purpose that cut workpiece.And it works in plasma cutting machine
When, if there is a situation where to be fitted without or be fitted without in nozzle and electrode, open circuit is equivalent to for external circuit.By
Very high (300V or more) in open-circuit voltage, there is the danger got an electric shock in cutting machine operating personnel, it is therefore desirable to carry out protection against electric shock to it
Protection.Core of the invention thought is to provide a kind of shock preventing protector of electric and method for plasma cutting machine, can
Whether detection nozzle and electrode are effectively installed, and increase power supply between nozzle and electrode, and detect nozzle and electrode
The whether equal mode of voltage judges whether be formed into a loop between nozzle and electrode, starts cutting machine further according to testing result or cuts
Deenergizing is given, to achieve the purpose that protection against electric shock.
It is proposed by the present invention anti-below in conjunction with 1~3 pair of attached drawing to keep the purpose of the present invention, advantages and features clearer
Electrocution devices and method are described in further detail.It should be noted that attached drawing is all made of very simplified form and uses non-
Accurately ratio, only for the purpose of facilitating and clarifying the purpose of the embodiments of the invention.
As used in this specification, singulative "a", "an" and "the" includes plural reference, unless interior
In addition appearance explicitly points out outer.It is as used in this specification, term "or" be typically with the meaning including "and/or" and into
Enforcement, in addition in addition non-content explicitly points out.
Fig. 1 is the hardware block diagram of the shock preventing protector of electric for plasma cutting machine shown by the present invention.Such as
Shown in Fig. 1, which includes electrode 1, nozzle 2, cutter circuit (not shown), detection circuit 10, control unit 20
And alarm signal 30.The workpiece 3 is connected with the positive and negative anodes of cutter circuit respectively with electrode 1, in workpiece and electrode
Between form electric arc.Electrode 1 is connected with the negative outside wire of detection circuit 10, the positive outside wire of nozzle 2 and detection circuit 10
Connection.Cutting machine work when, if nozzle in electrode exist do not install, open circuit is equivalent to for external circuit, due to open a way
Voltage is very high (300V or more), and cutting machine operating personnel have the danger got an electric shock, and need to carry out electrocution-proof protection to it.In striking
Before, whether the electrode and nozzle for needing to detect cutting machine are respectively mounted, to the lead-out wire OUT- from electrode, lead-out wire at nozzle
OUT+1.At this point, if nozzle and electrode are respectively mounted, be equivalent to VOUT-=VOUT+1, the positive outside wire of detection circuit 10 and
It is formed into a loop between negative outside wire, detection circuit 10 sends out detection signal to control unit 20, and control unit 20 receives detection
Signal, and according to the detection signal enabling cutting machine or send out alarm signal 30；Alarm signal is for cutting off the plasma
The operating current of cutting machine.
Fig. 2 is the shock preventing protector of electric circuit diagram for plasma cutting machine shown by the present invention.Such as Fig. 2 institutes
Show, detection circuit includes resistance R31, R34, capacitance C51, C52, photo-coupler U8, isolated power supply 1515, diode D19, D999
And CPU.Wherein resistance R34 one end connection electrode lead-out wire, the pin5 of 1515 isolated power supplies of another termination；The one end resistance R31 connects
D19 anodes are connect, the other end connects the inputing diode cathode of optocoupler；The one end capacitance C51 connect isolated power supply 1515 pin5 and
R34, the other end connect the inputing diode anode of pin7, D999 cathode and optocoupler of isolated power supply 1515；Capacitance C52 and optocoupler
Outlet side be connected with CPU；Diode D19 cathodes are connected with nozzle lead-out wire, and anode is connected with resistance R31；Diode D999
With optocoupler input side light emitting diode reversal connection.Wherein isolated power supply 1515 is used to power to electrode and nozzle mounting testing circuit.
Nozzle lead-out wire OUT+1 is connect simultaneously with electrode outlet line OUT- turns arc circuit, this turns arc circuit user realization and cuts
Cut the conversion between arc transferred arc.When being formed into a loop conducting between electrode and nozzle, this turns arc circuit work.As shown in Fig. 2, spray
Mouth lead-out wire OUT+1 also with the anode of zener diode ZD4, one end of resistance R125, C126, IGBT T10-1 emitter phase
Even；Electrode outlet line OUT- is also connected with one end of R35.This turn arc circuit predominantly detect that electrode is connected with nozzle after,
Triggering above turn arc circuit, machine Output transfer arc；And when electric current is big to after exceeding small arc current, turn-on transistor is electric
Road switchs to cutting arc output.Turn arc circuit to be mainly used for realizing the conversion between cutting arc transferred arc.ZYOUT is the output of arc voltage.
When being formed into a loop between the positive outside wire of detection circuit 10 and negative outside wire, in the input side of optocoupler U8
There is electric current to flow through above light emitting diode, the voltage signal that a 5V is spread out of by optocoupler U8 is sent at CPU, and CPU is detected
5V voltage signals can work normally, and welding gun can normal striking.If there are uninstalled situation, phases in nozzle and electrode at this time
When being open-circuit condition between VOUT- ≠ VOUT+1, OUT+1 and OUT-, there is no electric current on the input side diode of optocoupler
It flows through, the voltage signal to spread out of a 0V by optocoupler is sent at CPU.When CPU detects the voltage signal of 0V, can send out
Go out alarm signal, given value of current is cut off, to realize electrocution-proof protection.
Fig. 3 is the schematic diagram of electric shock prevention method of the present invention.As shown in figure 3, the electrocution-proof protection method includes：S101
Plasma cut prepares striking；Detection signal whether is formed into a loop and exported between S102 detecting electrodes and nozzle, judges to detect
Whether signal is equal to 5V, if entering the normal strikings of S103 equal to 5V, if entering S104 not equal to 5V sends out alarm signal, cut-out electricity
Stream is given.
Compared with prior art, the shock preventing protector of electric and method of plasma cutting machine provided by the present invention, energy
It enough detects nozzle and whether electrode is effectively installed to achieve the purpose that protection against electric shock.Detection circuit it is simple for structure, save at
This, and the occupied real space of the circuit is small, increases operating procedure, stabilization easy to use without additional.
On the other hand, whether shock preventing protector of electric provided by the present invention and method can simultaneously have nozzle and electrode
Effect installation is detected, and required time is short, reaction is fast.
Foregoing description is only the description to present pre-ferred embodiments, not to any restriction of the scope of the invention, this hair
Any change, the modification that the those of ordinary skill in bright field does according to the disclosure above content, belong to the protection of claims
Range.
Claims (10)
1. a kind of shock preventing protector of electric for plasma cutting machine, which is characterized in that including：
Whether detection circuit is formed into a loop between the detection circuit detecting electrode and nozzle and exports detection signal；
Control unit, described control unit receive the detection signal, and according to cutting machine described in the detection signal enabling or
Alarm signal is sent out, the alarm signal is used to cut off the operating current of the plasma cutting machine.
2. shock preventing protector of electric as described in claim 1, which is characterized in that the first test side of the detection circuit and institute
Electrode connection is stated, the second test side is connect with the nozzle.
3. shock preventing protector of electric as claimed in claim 2, which is characterized in that first test side is used to detect Vout-,
Second test side, as the Vout-=Vout+1, is formed into a loop for detecting Vout+1 between electrode and nozzle.
4. shock preventing protector of electric as described in claim 1, which is characterized in that the detection circuit include power supply and
Signal output unit is detected, said supply unit is powered for the detection circuit, and the detection signal output unit is used for basis
Whether the output detection signal is formed into a loop between electrode and nozzle.
5. shock preventing protector of electric as claimed in claim 4, which is characterized in that said supply unit is isolated power supply, described
Signal output unit is optocoupler.
6. shock preventing protector of electric as claimed in claim 5, which is characterized in that the detection circuit further include resistance R31,
R34, capacitance C51, C52, diode D19, D999, the one end resistance R31 connection electrode, the other end connect isolated power supply, institute
The anode that the one end resistance R31 connects the diode D19 is stated, the other end connects the inputing diode cathode of the optocoupler；It is described
The one end capacitance C51 connects the isolated power supply and resistance R34, and the other end connects isolated power supply, diode D999 cathodes and optocoupler
Inputing diode anode；The outlet side of the capacitance C52 and optocoupler connects, the diode D19 cathodes and nozzle lead-out wire
Connection, anode are connect with the resistance R31.
7. shock preventing protector of electric as claimed in claim 5, which is characterized in that the voltage of the isolated power supply is 12V.
8. shock preventing protector of electric as described in claim 1, which is characterized in that the detection signal is voltage signal, described
When voltage signal is 5V, starts the cutting machine and send out the alarm signal when voltage signal is 0V.
9. shock preventing protector of electric as described in claim 1, which is characterized in that the detection circuit is connect with arc circuit is turned.
10. a kind of electrocution-proof protection method for plasma cutting machine, which is characterized in that including：
Step 1：Whether it is formed into a loop between detecting electrode and nozzle and exports detection signal；
Step 2：According to the detection signal enabling cutting machine or the operating current of the cut-out cutting machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810186900.8A CN108372349B (en) | 2018-03-07 | 2018-03-07 | Electric shock protection device and method for plasma cutting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810186900.8A CN108372349B (en) | 2018-03-07 | 2018-03-07 | Electric shock protection device and method for plasma cutting machine |
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| CN108372349A true CN108372349A (en) | 2018-08-07 |
| CN108372349B CN108372349B (en) | 2023-06-30 |
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| CN201810186900.8A Active CN108372349B (en) | 2018-03-07 | 2018-03-07 | Electric shock protection device and method for plasma cutting machine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109709427A (en) * | 2018-12-30 | 2019-05-03 | 常州九圣焊割设备有限公司 | Attrition component fault detection method in plasma arc torch |
| CN109927187A (en) * | 2019-03-04 | 2019-06-25 | 山西中电科新能源技术有限公司 | Detect the method and silicon chip slicer sticky stick tooling of silicon rod slicing in place |
| CN114406424A (en) * | 2022-01-25 | 2022-04-29 | 常州九圣焊割设备股份有限公司 | Cutting torch protection method and device |
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| CN104959721A (en) * | 2015-07-24 | 2015-10-07 | 上海沪工焊接集团股份有限公司 | Circuit and method for controlling guiding arc of plasma cutting machine |
| CN211305168U (en) * | 2018-03-07 | 2020-08-21 | 上海威特力焊接设备制造股份有限公司 | Electric shock protection device for plasma cutting machine |
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| JPS6320173A (en) * | 1986-07-14 | 1988-01-27 | Hitachi Seiko Ltd | Plasma cutting equipment |
| FI895806A0 (en) * | 1988-12-05 | 1989-12-04 | Lincoln Electric Co | PLASMABAOGSTRAOLSYSTEMS FOERREGLING. |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109709427A (en) * | 2018-12-30 | 2019-05-03 | 常州九圣焊割设备有限公司 | Attrition component fault detection method in plasma arc torch |
| CN109709427B (en) * | 2018-12-30 | 2021-09-03 | 常州九圣焊割设备股份有限公司 | Method for detecting faults of consumable parts in plasma arc spray gun |
| CN109927187A (en) * | 2019-03-04 | 2019-06-25 | 山西中电科新能源技术有限公司 | Detect the method and silicon chip slicer sticky stick tooling of silicon rod slicing in place |
| CN114406424A (en) * | 2022-01-25 | 2022-04-29 | 常州九圣焊割设备股份有限公司 | Cutting torch protection method and device |
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|---|---|
| CN108372349B (en) | 2023-06-30 |
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