CN202106124U - Protective device for air plasma cutting machine - Google Patents
Protective device for air plasma cutting machine Download PDFInfo
- Publication number
- CN202106124U CN202106124U CN2011201210456U CN201120121045U CN202106124U CN 202106124 U CN202106124 U CN 202106124U CN 2011201210456 U CN2011201210456 U CN 2011201210456U CN 201120121045 U CN201120121045 U CN 201120121045U CN 202106124 U CN202106124 U CN 202106124U
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- CN
- China
- Prior art keywords
- phase
- mutually
- transformer
- loop
- main
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Arc Welding In General (AREA)
- Arc Welding Control (AREA)
Abstract
A protective device for an air plasma cutting machine comprises a three-phase power supply, namely phase A, phase B and phase C, a control circuit, a main contact, a shift conversion circuit, a control transformer, a draught fan circuit and a main transformer, wherein the control circuit is connected with the main contact which is connected with the main transformer, the shift conversion circuit is connected with the phase B and the phase C, and connected with the draught fan circuit and the control circuit through connecting the control transformer, and the phase A, the phase B and the phase C are connected with the main transformer by the main contact. The protective device is characterized in that the phase A and the phase C are connected with a contactor coil in series, and the normally closed contact of the contactor coil is connected with the input end of the shift conversion circuit in series. Once the phase A does not exist, the power of the control circuit can be switched off instantly, and the default-phase power is prevented from being connected in the main transformer, so that the purpose of protecting the main transformer is achieved, and the service life of the air plasma cutting machine is prolonged.
Description
Technical field
The utility model relates to a kind of air plasma cutter protective device.
Background technology
The air plasma cutter technology is quite rapid in China's development in recent years, and its good cutting performance makes it become indispensable important process in the Metal Cutting, has obtained application more and more widely at industrial departments such as oil, chemical industry, automobiles.Air plasma cutter is in use because control loop is only got two phase 380V power supplys at present; When scarce B phase or C phase time, can't reach the control loop required voltage, control loop can't be connected major loop; Main transformer can't be connected work, also just can not cause damage.But when A phase phase shortage, because B is mutually normal with C mutually, control loop triggers major loop connection work, and it is two electric mutually that main transformer just can insert, and easily main transformer burnt.
The utility model content
According to above deficiency of the prior art, the technical problem that the utility model will solve is: provide a kind of and can overcome above-mentioned defective, when A phase phase shortage, can in time stop control loop to connect major loop, prevent that the phase shortage electricity from causing damage to main transformer.
The utility model solves the technical scheme that its technical problem adopted: a kind of air plasma cutter protective device; Comprise three phase mains A phase, B phase and C mutually; Control loop, main contacts, gear conversion loop, control transformer, blower fan loop and main transformer; Control loop connects main contacts, and main contacts is connected with main transformer, and the gear change-over circuit inserts B phase and C mutually; The gear change-over circuit connects blower fan loop and control loop through connecting control transformer; A phase, B insert main transformer through main contacts with C mutually mutually, it is characterized in that: A is connected in series contactor coil with C mutually mutually, and the normally-closed contact of contactor coil is serially connected in the input in gear conversion loop.
When the short of electricity of A phase, be serially connected in A and move with the interior mutually contactor coil of C mutually, drive its normally-closed contact action, normally-closed contact breaks off.Because of its normally-closed contact is serially connected in getting in the electric line of control loop, normally-closed contact breaks off the power supply that has just cut off control loop, prevents that control loop connection main contacts from inserting main transformer with the phase shortage electricity.
The beneficial effect that the utility model had is: in case when A phase phase shortage takes place, can cut off the power supply of control loop in the very first time, prevent that the phase shortage electricity from inserting main transformer, reaches the purpose of protection main transformer, the service life of having improved air plasma cutter.
Description of drawings
Fig. 1 is the utility model electrical schematic diagram;
Among the figure: 1, control loop; 2, main contacts; 3, main transformer; 4, gear conversion loop; 5, control transformer; 6, blower fan loop.
The specific embodiment
Below in conjunction with accompanying drawing the embodiment of the utility model is done and to further describe:
As shown in Figure 1, a kind of air plasma cutter protective device comprises three phase mains A phase, B phase and C mutually; Control loop 1, main contacts 2, gear conversion loop 4, control transformer 5, blower fan loop 6 and main transformer 3; Control loop 1 connects main contacts 2, and main contacts 2 is connected with main transformer 3, and B phases and C are inserted mutually in gear conversion loop 4; Gear change-over circuit 4 connects blower fan loop 6 and control loop 1 through connecting control transformer 5; A phase, B insert main transformer 3 through main contacts 2 with C mutually mutually, and A is connected in series contactor coil KM with C mutually mutually, and the normally-closed contact KM1 of contactor coil KM is serially connected in the input in gear conversion loop 4.
When the short of electricity of A phase, be serially connected in the interior mutually contactor coil KM action of A, drive its normally-closed contact KM1 action, normally-closed contact KM1 breaks off.Be serially connected in the input in gear conversion loop because of its normally-closed contact KM1; Normally-closed contact KM1 breaks off the power supply that has just cut off gear conversion loop 4; And then cut off the power supply in control loop 1 and blower fan loop 6, prevent that control loop 1 from connecting main contacts 2 the phase shortage electricity is inserted main transformer 3, and cut off fan power; Through the blower fan stall, let people find the phase shortage problem more intuitively.
Claims (1)
1. air plasma cutter protective device; Comprise three phase mains A phase, B phase and C mutually, control loop, main contacts, gear conversion loop, control transformer, blower fan loop and main transformer, control loop connects main contacts; Main contacts is connected with main transformer; The gear change-over circuit insert B mutually with C mutually, the gear change-over circuit connects blower fan loop and control loop through connecting control transformer, A phase, B mutually and C mutually through main contacts access main transformer; It is characterized in that: A is connected in series contactor coil with C mutually mutually, and the normally-closed contact of contactor coil is serially connected in the input in gear conversion loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201210456U CN202106124U (en) | 2011-04-22 | 2011-04-22 | Protective device for air plasma cutting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201210456U CN202106124U (en) | 2011-04-22 | 2011-04-22 | Protective device for air plasma cutting machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202106124U true CN202106124U (en) | 2012-01-11 |
Family
ID=45431573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201210456U Expired - Fee Related CN202106124U (en) | 2011-04-22 | 2011-04-22 | Protective device for air plasma cutting machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202106124U (en) |
-
2011
- 2011-04-22 CN CN2011201210456U patent/CN202106124U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120111 Termination date: 20150422 |
|
| EXPY | Termination of patent right or utility model |