Full-power grid voltage inverter welding machine

Abstract

The invention relates to a full-power grid voltage inverter welding machine. The full-power grid voltage inverter welding machine comprises a structure of the welding machine and multiple control circuits in the machine; the control circuits consist of multiple circuit boards; the composed circuit boards relate to capacitance boards, IGBT inversion boards, IGBT drive boards, switch power supply boards, control boards, voltage conversion or switching boards and output rectifying boards; a novel cooling air channel is adopted and capable of effectively achieving the effects of preventing the dust, improving the cooling effect and improving the work reliability of the welding machine; meanwhile, both maintenance and assembly are convenient; the welding machine can adopt full-power grid voltage, that is, single-phase 220 V and 380 V and three-phase 380 V power supply voltage is used for supplying electricity; and meanwhile, through arrangement of several control circuits, the work reliability of the welding machine is improved, the digital adjustment and display of welding parameters are realized, and the work reliability and performance are greatly improved compared with several welding machines with the same type.

Description

technical field [0001] The invention relates to the field of electric welding machines, in particular to a full grid voltage inverter welding machine. [0002] technical background [0003] At present, the market competition for inverter welding machine products with single-phase 220V, 380V and three-phase 380V power supply voltages in the whole grid is very fierce, which is not only reflected in the advancement and advantages of control technology, but also largely depends on In terms of the structure, circuit, protection and convenience of later maintenance of the welding machine, the structural design is not good. , output reactor, radiator, etc.), which will seriously affect the performance of the welding machine (such as load duration, temperature rise index, reliability, etc.); the unreasonable design of the control circuit of the welding machine will also lead to its reliable operation The performance is reduced and the failure rate is high. For example, the unreliab...

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Problems solved by technology

The cold air enters from the bottom of the welding machine and is heated by the heating components inside the welding machine, and the hot air is discharged from the top of the welding machine to make the air circulate naturally to achieve the purpose of cooling. This method of cooling efficiency is very low and the effect is not good. Machine weight is heavy, production cost is high, service life is short

2) Vertical forced air cooling: Use the inside of the vertical casing to directly make the air duct, and the cooling fan is mostly fixed on the top of the welding machine (blowing or drawing), and the air flows in the vertical direction in the air duct, taking away the internal parts of the welding machine The heat generated; the disadvantage of this method is: the cross-sectional area of ​​the air duct is too large, the wind is not concentrated, and the heat dissipation effect is poor; the control circuit and the main circuit are in the same air duct, and when the control circuit is not protected, the dust and dust brought in by the cooling air Metal dust will affect the long-term reliability and service life of the welding machine. It is not suitable for welding in dusty environments, especially in environments with conductive dust; the weight of the welding machine is heavy and the production cost is high.

3) Horizontal forced air cooling; use the inside of the horizontal casing to directly make the air duct, and the cooling fan is fixed at the front or rear of the welding machine (blowing or exhausting), and the air flows in the air duct along the horizontal direction, taking away the internal zero The heat generated by the components; the disadvantage of this method is: the cross-sectional area of ​​the air duct is large, and there is a large gap between the transformer, radiator and other components and the side plate of the box cover, which will make the cooling air blown in relatively scattered and the wind force is not strong. Centralized, the cooling effect of the welding machine is poor; the control circuit and the main circuit are in the same air duct, and when the control circuit is not protected, the dust and metal dust brought in by the cooling air will affect the reliability of the long-term work of the welding machine and the life of the welding machine. Suitable for welding construction in dusty, especially conductive dusty environments; the weight of the welding machine is heavy, and the production cost is high

Different circuit designs have different working reliability. If the circuit design is not good, it will directly lead to a high failure rate of the welding machine, and a large number of complaints and returns from users will seriously affect the sales of products and the economic benefits of enterprises.

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