CN2276391Y

CN2276391Y - High-frequency arc striking apparatus used with contravariant welder

Info

Publication number: CN2276391Y
Application number: CN 96247049
Authority: CN
Inventors: 王志强
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 1996-11-19
Filing date: 1996-11-19
Publication date: 1998-03-18
Anticipated expiration: 2006-11-19

Abstract

The utility model relates to a high frequency arc striking device matched with a contravariant welder, which is formed by mainly connecting a step-up transformer and a high frequency oscillating circuit which have the connection relationship that an intermediate frequency transformer T 1 in a contravariant welder adds a secondary winding S 2 connected with a circuit of the high frequency arc striking device, and the output of the secondary winding is used as a fundamental wave voltage and a power supply of the high frequency arc striking device, the secondary winding S 2 is connected with a primary pole of a step-up transformer T 2 through a relay and a fuse, and the secondary pole of the step-up transformer T 2 is connected in parallel with oscillating capacitors C 1 and C 2. After connected with a spark discharger, the secondary pole of the step-up transformer T 2 is connected with a primary pole of a coupling transformer T 3, and the secondary of the coupling transformer T 3 is connected between a welding gun and work pieces through a capacitor C 3. The high-frequency arc striking device has the advantages of simple structure, small volume and high reliability, can implement cutting off in a high frequency non-contact mode and has good compatibility with the contravariant welder.

Description

A kind of hf arc starter of and inverter type welder adapted

The utility model is a kind of and the hf arc starter inverter type welder adapted, belongs to welding equipment.

Inverter type welder is the emerging Arc Welding Power of the eighties, and is efficient, energy-conservation with it, realize automation easily and be widely used.When inverter type welder was applied to argon tungsten-arc welding, because the air gap that needs high-frequency and high-voltage to puncture between tungsten electrode and the welded piece ignites electric arc, hf arc starter became requisite auxiliary equipment.During beginning, people are with the high-frequency arc strike device and the inverter type welder adapted of traditional direct booster type of power frequency electricity, because traditional hf arc starter uses power-frequency voltage as the vibration first-harmonic, the oscillator per second just produces 100 groups of high-frequency impulses, because of high-frequency impulse group number few, higher oscillating voltage amplitude must be used, the electric arc reliable ignition could be guaranteed.But too high oscillating voltage damages the power switch pipe and the quick rectifying tube of inverter type welder easily, and the interference of inverter type welder circuit is increased, and influences functional reliability.Therefore, the application of the direct step-up high frequency striking device of power frequency electricity is restricted.After this, people have studied inversion boosting type high-frequency arc strike device, it is that dc output end at inverter type welder connects a high power valve and step-up transformer constitutes inverter circuit, the intermediate frequency fundamental voltage of the 10～25KHz that uses for high-frequency oscillating circuits in the secondary output of step-up transformer, the high-frequency generator per second of Gou Chenging can produce 20000～50000 groups of high-frequency impulses like this, because of high-frequency impulse group number is many, can use lower oscillating voltage amplitude also can guarantee the reliable ignition of electric arc.Such hf arc starter is to the power switch of inverter type welder and rectifying tube harm is little fast, has compatible preferably with inverter type welder.Therefore yet inversion boosting type high-frequency arc strike device needs high power valve and attached radiator and drive circuit, has still that complex structure, fault are more, the shortcoming of poor reliability.

The purpose of this utility model is more with regard to the complex structure, the fault that are to overcome and solve above-mentioned inversion boosting type high-frequency arc strike device and exist, the shortcoming and the problem of poor reliability, a kind of circuit reduction of research and design, simple in structure, fault rate is low, reliability is high, and with inverter type welder can be good compatible, the hf arc starter of adapted.

The utility model is realized by following organization plan: the inverter circuit schematic diagram of inverter type welder as shown in Figure 1, with the hf arc starter circuit theory diagrams of inverter type welder adapted as shown in Figure 2, it is characterized in that it is is main connecting and composing by step-up transformer and high-frequency oscillating circuits, its interconnected relationship is: increase by one group of secondary coil S of coiling on the framework of inverter type welder intermediate-frequency transformer ₂, and it is connected with the hf arc starter circuit, with fundamental voltage and the power supply of its output as hf arc starter, S ₂Through relay J ₄Contact J _4-1, fuse FS and hf arc starter step-up transformer T ₂Elementary being connected, step-up transformer T ₂Secondary and oscillating capacitance C ₁And C ₂Be connected in parallel T ₂Secondary and be connected in series with SD FD after, be connected to high-frequency coupling transformer T ₃Elementary, high frequency transformer T ₃Secondary through welding machine protection capacitor C ₃Be connected between welding gun G and the workpiece WP inverter type welder IWM and welding machine protection capacitor C ₃Be connected in parallel.Its action principle is: utilize the secondary S of inverter type welder intermediate-frequency transformer ₂Output as the fundamental voltage and the power supply of striking device, relay J ₄Effect be the connection and the cut-out of control striking device circuit, S ₂The fundamental voltage of output is after step-up transformer coupling and increasing degree, and SD FD produces spark discharge, makes oscillating capacitance C ₁And C ₂With high-frequency coupling transformer T ₃The lc circuit of elementary formation produce vibration, oscillating voltage is through T ₃Coupling is added between welding gun G and the workpiece WP, and electric arc is ignited.

The utility model is compared with existing hf arc starter with the inverter type welder adapted following advantage and beneficial effect: (1) circuit reduction, and simple in structure.Because the fundamental voltage of the oscillating circuit of the present utility model directly intermediate-frequency transformer from inverter type welder obtains, and makes hf arc starter need not any external power supply, is directly powered by inverter type welder; Can save in addition in order to produce the inverter circuit that constitutes by high-power switch tube and attached radiator thereof and drive circuit of vibration fundamental voltage, circuit of the present utility model and structure are simplified greatly, not only reduced volume, saved material, also reduced rate of breakdown, functional reliability improves greatly; (2) use the utility model can realize the contactless automatic cut-out of high frequency.After the utility model electric arc ignited, the work pulsewidth of inverter type welder reduced, and promptly the fundamental voltage width of high-frequency oscillating circuits reduces, the oscillating capacitance undercharge, SD does not discharge, and has realized the instant automatically cut-out of high-frequency energy after electric arc ignites, and has reduced the interference to inverter type welder; (3) the utility model and inverter type welder have favorable compatibility.Owing to produce about 50000 groups of high-frequency impulses (relevant) in this hf arc starter per second with the welding machine reverse frequency, thereby can use lower high-frequency oscillation voltage amplitude just can guarantee the reliable ignition of electric arc, therefore can effectively reduce harm to inverter type welder high-speed switch device.

Below Figure of description is further specified as follows: Fig. 1 is the schematic diagram of inverter type welder inverter circuit, and Fig. 2 be the utility model---a kind of circuit theory diagrams of hf arc starter of and inverter type welder adapted.Among each figure: BG ₁～BG ₄Be the high-power switch tube of inverter type welder, T ₁Be the intermediate-frequency transformer of inverter type welder, P ₁Be transformer T ₁Elementary winding, S ₁Be the desired T of inverter type welder circuit for power conversion ₁Secondary winding of transformer, S ₂Be that this hf arc starter requires the T that increases ₁Secondary winding of transformer, J _4-1It is relay J ₄A contact, FS is a fuse, T ₂Be high-frequency step-up transformer, FD is a SD, C ₁, C ₂Be oscillating capacitance, T ₃Be the high-frequency coupling transformer, IWM is an inverter type welder, C ₃Be the protection electric capacity of inverter type welder, G is a welding gun, and WP is a workpiece.

Embodiment of the present utility model is as follows: (1) increases a winding S by shown in Figure 1 on the intermediate-frequency transformer framework of conventional inversion welding machine ₂(2) then by protracting circuit plate shown in Figure 2, purchase and screen components and parts, carry out Installation and Debugging by the interconnected relationship of described each parts of top specification again, just can make the utility model---with the hf arc starter of inverter type welder adapted.(name calls " IGBT Welding Inverter " to the inventor, and the patent No. is: 91219954.7 utility model patent) match and carry out the argon tungsten-arc welding test with existing inverter type welder this hf arc starter.Result of the test shows that the striking of this hf arc starter is rapid, control is easy, and the butt welding machine circuit disturbs little, can realize the contactless cut-out of high frequency, with inverter type welder favorable compatibility is arranged.

Claims

1, a kind of hf arc starter of and inverter type welder adapted is characterized in that it is is main connecting and composing by step-up transformer and high-frequency oscillating circuits, and its interconnected relationship is: increase by one group of secondary coil S of coiling on the framework of inverter type welder intermediate-frequency transformer ₂, and it is connected with the hf arc starter circuit, with fundamental voltage and the power supply of its output as hf arc starter, S ₂Through relay J ₄Contact J _4-1, fuse FS and hf arc starter step-up transformer T ₂Elementary being connected, step-up transformer T ₂Secondary and oscillating capacitance C ₁And C ₂Be connected in parallel T ₂Secondary and be connected in series with SD FD after, be connected to high-frequency coupling transformer T ₃Elementary, T ₃Secondary through welding machine protection capacitor C ₃Be connected between welding gun G and the workpiece WP inverter type welder IWM and welding machine protection capacitor C ₃Be connected in parallel.