CN2276853Y

CN2276853Y - Capacitive accumulating resistance welder

Info

Publication number: CN2276853Y
Application number: CN 95238352
Authority: CN
Inventors: 邹玉恒; 张炼
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-12-30
Filing date: 1995-12-30
Publication date: 1998-03-25
Anticipated expiration: 2005-12-30

Abstract

The utility model provides a novel capacitance energy storage resistance welder, composed of a power supply circuit, a micro computer control circuit, a relay loop, a triggering loop, a sample circuit, and a main circuit, wherein, the main circuit is composed of a charging loop, a discharge loop, a protection circuit, and an executing electrode. The charging process of the utility model is that an alternating voltage, under the control of a computer program, charges an energy storage capacitor with constant current by a half-control bridge rectifying circuit, with a traditional charging transformer omission. The utility model has the advantages of stable charging speed, low energy consumption, small volume, and low cost.

Description

A kind of novel capacitor accumulation energy type resistance welder

The utility model has related to a kind of electric welding machine, specifically a kind of capacitor energy storage type resistance welder.

In energy storage type resistance welded field, control method adopts charging transformer current-limiting type charge-discharge circuit mostly, control the storage that realizes energy and the release of energy in conjunction with light current, but this traditional method has following shortcoming: 1, the charging starting current is big, charging rate is not steady, and electric current can't keep constant in whole charging process; 2, energy consumption is big, existing no-load transformer, and the leakage field equal loss also has the energy loss that causes because of rush of current; 3, volume is big, the cost height.

The purpose of this utility model just provides a kind of charging transformer that do not have, and novel capacitor accumulation energy type resistance welder that can constant-current charge is to overcome above-mentioned deficiency.

For achieving the above object, the utility model is by power circuit, microcomputer control circuit, relay loop, trigger the loop, sample circuit and main circuit are formed, be characterized in: main circuit is by charge circuit, discharge loop, holding circuit and execution electrode DJ form, wherein charge circuit is by air switch DZ, fuse RZ1-RZ2, contact CJ1-1～CJ1-2 of contactor CJ1, bridge rectifier, energy-storage capacitor CL and current-limiting resistor ZR0 form, power supply is by air switch DZ, fuse RZ1, RZ2, contact CJ1-1, CJ1-2, through rectification circuit and current-limiting resistance ZR0, make DC voltage be added in energy-storage capacitor CL two ends; Discharge loop is made up of energy-storage capacitor CL, discharge transformer T, discharging thyristor SCR4, and the transformer T's that wherein discharges is elementary in parallel with energy-storage capacitor CL by controllable silicon SCR 4; Above-mentioned discharge loop also includes by the contact CJ1-3 of resistor ZR1, contactor CJ1, put the surplus electric loop of putting that surplus electric controllable silicon SCR 3 is composed in series, and wherein resistor ZR1, contact CJ1-3, controllable silicon SCR 3 series connection backs are in parallel with above-mentioned capacitor CL; Be parallel with the contact CJ2-1 that can make the contactor CJ2 that discharging thyristor turn-offs as early as possible on the above-mentioned discharging thyristor SCR4; above-mentioned bridge rectifier is made up of commutation diode ZD1, the ZD2 that can make the charge circuit constant-current charge and rectification thyristor SCR1, SCR2; a commutation diode is replaced with controllable silicon in the every road that is about in the rectification circuit commonly used, and the two ends of above-mentioned controllable silicon SCR 1, SCR2, SCR4 are parallel with rc protection circuit R1C1, R2C2, R4C4 respectively.Elementary rc protection circuit R3C3 and the protection diode ZD3 of being parallel with of above-mentioned discharge transformer T; Its secondary with carry out electrode DJ and connect.

The utility model has been cast out traditional charging transformer, with the very little resistor of power consumption in conjunction with microcomputerized control rectification thyristor phase shifting control.Thereby reach the purpose of constant-current charge, the utility model charging rate steadily, less energy consumption, volume is little, cost is low.

Fig. 1 is a principle schematic of the present utility model.

Further specify the utility model below in conjunction with accompanying drawing.

Charging process is the normally opened contact CJ1-1～CJ1-2 of alternating voltage through air switch DZ, fuse RZ1～RZ2, contactor CJ1, the current signal QY1, the QY2 that detect according to sample circuit in the microcomputerized control loop, through calculation process, by triggering the corresponding phase-shift pulse signal G1 of loop output, the conducting that G2 removes to control rectification thyristor SCR1, SCR2, to energy-storage capacitor CL constant-current charge; Discharge process is under the control of discharge enabling signal, the microcomputerized control loop is by circuits for triggering output discharge signal G4, open discharging thyristor SCR4, the energy of energy-storage capacitor CL is discharged on the workpiece of required welding through discharge transformer T and execution electrode DJ, thus the welding process of finishing.After welding was finished, if the elementary of discharge transformer T also has residual current that discharging thyristor SCR4 can not be turn-offed, but starting contactor CJ2 turn-offed discharging thyristor SCR4; After if discharge process is finished, energy-storage capacitor CL also has complementary energy, can by by the contact CJ1-3 of resistor ZR1, contactor CJ1, put the surplus electric loop of putting that surplus electric controllable silicon SCR 3 is composed in series and bleed off energy remaining, this signal sends signal G3 through triggering the loop.The relevant detection signal inputs to the microcomputerized control loop when occurring short circuit in the main circuit or charge out of control, overvoltage, handles the general supply of can autotomying by software.

Claims

1. novel capacitor accumulation energy type resistance welder; it is made up of power circuit, microcomputerized control loop, relay loop, triggering loop, sampling loop and main circuit; it is characterized in that: main circuit is made up of charge circuit, discharge loop, holding circuit and execution electrode DJ, wherein:

(1) charge circuit is made up of contact CJ1-1～CJ1-2, bridge rectifier, energy-storage capacitor CL and the current-limiting resistor ZRO of air switch DZ, fuse RZ1～RZ2, contactor CJ1, power supply makes DC voltage be added in energy-storage capacitor CL two ends by air switch DZ, fuse RZ1, RZ2, contact CJ1 1, CJ1-2, through rectification circuit and current-limiting resistance ZR0;

(2) discharge loop is made up of energy-storage capacitor CL, discharge transformer T discharging thyristor SCR4, and the transformer T's that wherein discharges is elementary in parallel with energy-storage capacitor CL by controllable silicon SCR 4;

(3) above-mentioned discharge loop also includes by the contact CJ1-3 of resistor ZR1, contactor CJ1, puts the surplus electric loop of putting that surplus electric controllable silicon SCR 3 is composed in series, and wherein resistor ZR1, contact CJ1-3, controllable silicon SCR 3 series connection backs are in parallel with above-mentioned capacitor CL;

(4) be parallel with the contact CJ2-1 that can make the contactor CJ2 that discharging thyristor turn-offs as early as possible on the above-mentioned discharging thyristor SCR4.

2, according to the described capacitor energy storage type resistance welder of claim 1, it is characterized in that: above-mentioned bridge rectifier is made up of commutation diode ZD1, the ZD2 that can make the charge circuit constant-current charge and rectification thyristor SCR1, SCR2, and a commutation diode is replaced with controllable silicon in the every road that is about in the rectification circuit commonly used.