CN201161330Y - Energy storage spot welding machine - Google Patents

Abstract

An energy storage spot welding machine comprises a power supply connector, an energy storage device and a welding contact, wherein the energy storage device comprises a voltage-stabilizing and current-stabilizing switching power supply charger, a super capacitor bank, a welding control part and a welding on-off switch part; the input end of the voltage-stabilizing and current-stabilizing switching power supply charger is the power supply connector end, and the output end of the voltage-stabilizing and current-stabilizing switching power supply charger is connected with the super capacitor bank in parallel to charge the super capacitor bank; the welding on-off switch part is connected with the supercapacitor bank and the welding contact in series, and the welding control part is connected with the welding on-off switch part to control the connection or disconnection between the energy storage device and the welding contact. The utility model discloses an energy storage spot welder is small, light in weight, with low costs, and has improved efficiency, has energy-conserving effect, compares electromagnetic radiation little, life obviously longer with the traditional spot welder that adopts mechanical contact again.

Description

Energy storage spot welder

technical field

The utility model relates to a spot welding machine, in particular to a miniaturized energy storage spot welding machine.

Background technique

Spot welding machine is a commonly used welding equipment in industry. It is widely used in the welding of various metal plates, sheets, foils and wires. It is an indispensable welding equipment for many metal processing enterprises, electronic components and complete machine enterprises.

At present, the more commonly used spot welding machine is a kind of energy storage spot welding machine that adopts the principle of capacitor energy storage and uses the principle of instantaneous release of large current to weld the workpiece. And ferrous metals are welded well, and the workpiece is not easy to oxidize. The energy storage device used in the traditional energy storage spot welding machine is an aluminum electrolytic capacitor. Since the capacity of the electrolytic capacitor is only a few hundred to several thousand microfarads, the electric energy it can store is very low. In order to improve its energy storage capacity, in order to achieve To meet the energy storage requirements during welding, many electrolytic capacitors (tens to hundreds) must be connected in series and parallel to increase its overall capacity. However, the series-parallel connection of many electrolytic capacitors will inevitably bring high voltage at the output end. If the high-voltage output is directly used for spot welding operations, it is easy to generate high-voltage arcs, which will affect the welding quality and is not safe for operators. Therefore, it must be equipped with The output transformer converts the electric energy stored in the capacitor into low-voltage and high-current to act on the workpiece to be welded through the output transformer to realize welding. Its circuit schematic diagram can be seen in Figure 1. Due to the use of a larger output transformer in the circuit, the traditional capacitor energy storage spot welding machine has large volume, heavy weight and high cost.

Contents of the invention

The main purpose of the utility model is to provide an energy storage spot welding machine with small volume, light weight, low cost and high welding efficiency.

In order to achieve the above-mentioned purpose, the utility model provides an energy storage spot welding machine, including a power connector, an energy storage device and a welding contact, and the energy storage device includes a voltage-stabilizing and current-stabilizing switching power supply charger, a supercapacitor bank, a welding The control part and the welding on-off switch part, the input terminal of the voltage-stabilizing switching power supply charger is the power connector end, and the output terminal of the voltage-stabilizing switching power supply charger is connected in parallel with the supercapacitor bank , charge the supercapacitor bank with the set current, the welding on-off switch part is connected in series with the supercapacitor bank and the welding contact, and the welding control part is connected with the welding The on-off switch part is connected to control the conduction or shut-off between the energy storage device and the welding contact.

The welding on-off switch part includes a power switching device and a drive unit; the welding control part includes an operation instruction input and processing module and a welding output control module; the operation instruction input and processing module outputs The control module generates a driving command to make the driving unit generate a bias voltage to control the power switching device to be turned on and off.

The energy storage device also includes a leakage unit connected in parallel with the supercapacitor bank; the welding control part also includes a leakage control module, and the leakage control module is connected with the leakage unit and the leakage control module respectively. The operation instruction input is connected with the processing module, so as to drive the leakage unit to release electric energy according to the instruction of the operation instruction input and the processing module after welding.

The welding control part also includes a supercapacitor bank working state monitoring module connected with the supercapacitor bank; so that the operation command input and processing module monitors the working voltage of the supercapacitor bank, and when overvoltage output control signal.

The welding control part also includes a charging power control module connected with the voltage-stabilizing switching power supply charger, so that the operation instruction input and processing module drives the voltage-stabilizing switching power supply charger to output stable Voltage and current.

The power switching device is an IGBT power device; the gate of the IGBT power device is connected to the drive unit, the drain is connected to one end of the supercapacitor bank, and the source is connected to the welding contact.

The power switching device is a high-power MOSFET tube; the gate of the MOSFET tube is connected to the drive unit, the drain is connected to one end of the supercapacitor bank, and the source is connected to the welding contact.

The supercapacitor bank is composed of 10 supercapacitor monomers with a capacity of 500F connected in series.

The supercapacitor bank is composed of 20 supercapacitor monomers with a capacity of 2000F connected in series.

The supercapacitor monomer is an electric double layer supercapacitor, an electrochemical supercapacitor or a hybrid supercapacitor.

The utility model has the following beneficial effects. The energy storage spot welding machine of the utility model adopts a supercapacitor group as an energy storage device, and can meet the requirements of low voltage and high current during spot welding without setting an output transformer in the circuit, so that the energy storage The energy spot welding machine has the advantages of small size, light weight, and low cost; and because the low-voltage and high-current electric energy on the energy storage device is directly used for spot welding, it improves efficiency and has energy-saving effects; and because the use of IGBT or large The power MOSFET tube is used as a welding on-off switch, so compared with traditional spot welding machines that use mechanical contacts, the electromagnetic radiation is small and the service life is significantly longer.

Description of drawings

Fig. 1 is the circuit principle diagram of existing traditional energy storage spot welding machine;

Fig. 2 is the circuit schematic diagram of the energy storage spot welding machine of the present utility model;

Fig. 3 is a functional block diagram of the welding control part of the energy storage spot welding machine of the present invention.

Detailed ways

In order to further illustrate the principle and structure of the present invention, preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

Please refer to shown in Fig. 2, the energy storage spot welding machine of the present utility model comprises the power connector 300, energy storage device 100 and welding contact 200 that are connected in sequence, and wherein this energy storage device 100 comprises steady voltage steady current switching power supply charger 1 , supercapacitor bank 2, leakage unit 3, welding on-off switch part 4 and welding control part 5.

The input terminal of the constant voltage and constant current switching power supply charger 1 is the power connector 300 , through which the constant voltage and constant current switching power supply charger can be connected with an external power source, so as to output stable current and voltage.

The supercapacitor bank 2 can be formed by connecting 1 to 200 supercapacitors in series and parallel. The supercapacitor is a new type of energy storage device between rechargeable batteries and traditional capacitors. It has a good low-voltage and high-current capability. It has the advantages of high power density of conventional capacitors and high power density of rechargeable batteries, fast charge and discharge, long life, wide working temperature limit, good voltage memory, and maintenance-free. A single supercapacitor in the supercapacitor bank 1 can be any one of an electric double layer supercapacitor, an electrochemical supercapacitor and a hybrid supercapacitor. The supercapacitor bank 2 is connected in parallel with the output terminal of the voltage-stabilizing and current-stabilizing switching power supply charger 1 .

The leakage unit 3 is connected to both ends of the supercapacitor bank 2 . When each welding work ends or when the energy storage electric welding machine is not used for a long time and needs to be overhauled, the power switch is turned off, and the leakage unit 3 can slowly release the electric energy in the supercapacitor bank 2 to ensure safety.

The welding on-off switch part 4 includes a power switching device 41 and a drive unit 42. The power switching device 41 can be an IGBT power device or a high-power MOSFET tube. between the heads 200 , and the drain and source of the power switching device 41 are respectively connected to one end of the supercapacitor bank 2 and the welding contact 200 . The power switching device 41 can control the discharge time and welding waveform of each welding. The drive unit 42 is connected to the gate of the IGBT power device or the gate of the high-power MOSFET to drive the power switching device 41 to turn on or off, and can control the turn-on and turn-off time.

Please refer to FIG. 3 , the welding control part 5 includes an operation instruction input and processing module 51 , a charging power supply control module 52 , a leakage control module 53 , a supercapacitor bank working state monitoring module 54 and a welding output control module 55 . The operation instruction input and processing module 51 is connected with the other four modules to receive and process the feedback information and manual operation instructions from the other four modules. The output end of the charging power supply control module 52 is connected to the regulated voltage and current switching power supply charger 1, and the operation instruction input and processing module 51 controls the charging power supply control module 52 to output a charging voltage regulation signal and a charging current regulation signal, thereby The output end of the charger 1 is driven to output a certain value of stable current, and the voltage is limited within a certain range. The output terminal of the leakage control module 53 is connected with the leakage unit 3, so that when the welding work of the energy storage electric welding machine is finished or needs to be overhauled, the operation instruction input and processing module 51 controls the leakage control module 53 to output a The leakage control signal turns on the leakage unit 3 to slowly release the electric energy stored in the supercapacitor bank 2 . The supercapacitor bank working state monitoring module 54 is connected with the supercapacitor bank 2 to monitor the working voltage of the supercapacitor bank 2 and feed back to the operation command input and processing module 51 to output a control signal when overvoltage . The output end of the welding output control module 55 is connected with the drive unit 42, the operation command input and processing module 51 generates a drive command through the welding output control module 55 according to the operation command, and the drive unit 42 generates a bias after receiving the drive command. To control the on-off of the power switching device 41, and then control the start and stop of welding action and the time of welding.

Embodiment one:

In this embodiment, the supercapacitor bank 2 is composed of 10 supercapacitor cells with a capacity of 500F connected in series. For the structure and connection relationship of other parts, please refer to FIG. 2 to FIG. 3 . When in use, first adjust the welding control part 5 to adjust the voltage and current switching power supply charger 1 to an appropriate output voltage according to the material and thickness of the welded workpiece, so that the power switching device 41 can be properly turned on and off. Then turn on the external power supply and start charging the supercapacitor bank 2. After the voltage of the supercapacitor bank 2 is charged to the required voltage, the welding work can be carried out. After each welding, the voltage of the supercapacitor bank 2 will decrease to a certain extent, and the welding contact 200 will lift up, and at this time, the voltage-stabilizing switching power supply charger 1 will continue to charge the supercapacitor bank 2 . During the welding process, the charging voltage of the voltage-stabilizing switching power supply charger 1 and the conduction time of the power switching device 41 can be adjusted appropriately according to the quality of the solder joints, so as to achieve better welding quality. After the welding work is finished, turn off the power switch, and the leakage unit 3 automatically discharges the supercapacitor bank 2 to ensure safety.

Experiments show that the energy storage spot welding machine of this embodiment can weld metals such as copper, nickel, iron, and stainless steel with a thickness of about 0.4 mm.

Embodiment two:

The supercapacitor bank 2 in this embodiment is composed of 20 supercapacitor monomers with a capacity of 2000F connected in series, and the structure, connection relationship and working principle of the remaining parts are the same as those in Embodiment 1, and will not be repeated here. After experiments , The energy storage spot welding machine of the present embodiment can weld metals such as copper, nickel, iron, and stainless steel with a thickness of about 1.2 mm.

It can be seen from the above two embodiments that the number of supercapacitor cells inside the supercapacitor bank 2 and the series-parallel structure can be adjusted according to actual welding requirements, and will not be listed here.

After comparison, the spot welding machine with supercapacitor as the energy storage device proposed by the utility model has better welding effect than the traditional spot welding machine, and the volume is reduced by more than 10%, the weight is reduced by more than 20%, and the energy saving is 5-10%.

The energy storage spot welding machine of the utility model adopts the supercapacitor group 2 as an energy storage device, and can meet the requirements of low voltage and high current during spot welding without setting an output transformer in the circuit, so that the energy storage spot welding machine has a small size , light weight and low cost; and because the low-voltage and high-current electric energy on the energy storage device is directly used for spot welding, the efficiency is improved and energy-saving effect is achieved; and because the IGBT or high-power MOSFET tube is used as the welding on-off switch, so compared with traditional spot welding machines that use mechanical contacts, the electromagnetic radiation is small and the service life is significantly longer.

However, the above descriptions are only preferred feasible embodiments of the present utility model, and do not limit the scope of protection of the present utility model. Therefore, all equivalent structural changes made by using the utility model specification and accompanying drawings are included in this utility model. within the scope of protection of utility models.

Claims (10)

1. reserve energy spot welding machine, comprise power connection, energy storage device and welding contact, it is characterized in that: described energy storage device comprises voltage stabilization and current stabilization Switching Power Supply charger, bank of super capacitors, welding control section and welding on-off switch part, the input of described voltage stabilization and current stabilization Switching Power Supply charger is described power connection end, the output and the described bank of super capacitors of described voltage stabilization and current stabilization Switching Power Supply charger are in parallel, with the electric current that sets described bank of super capacitors is charged, described welding on-off switch part is connected in series with described bank of super capacitors and described welding contact, and, described welding control section partly links to each other with described welding on-off switch, to control conducting or the shutoff between described energy storage device and the described welding contact.

2. reserve energy spot welding machine according to claim 1 is characterized in that, described welding on-off switch partly comprises device for power switching and driver element; Described welding control section comprises operational order input and processing module and welding output control module; Described operational order input produces by described welding output control module according to operational order with processing module and drives instruction, makes described driver element produce bias voltage, to control the break-make of described device for power switching.

3. reserve energy spot welding machine according to claim 2 is characterized in that, described energy storage device also comprises with described bank of super capacitors is in parallel lets out electric unit; Described welding control section also comprises lets out electric control module, the described electric control module of letting out is let out the input of electric unit and described operational order and is linked to each other with processing module with described respectively, drives the described electric unit release electric energy of letting out to finish the back in welding according to the instruction of described operational order input and processing module.

4. according to claim 2 or 3 arbitrary described reserve energy spot welding machines, it is characterized in that described welding control section also comprises the bank of super capacitors Working Status Monitoring module that links to each other with described bank of super capacitors; So that described operational order is imported with processing module the operating voltage of this bank of super capacitors is monitored, and when overvoltage, exported control signal.

5. according to claim 2 or 3 arbitrary described reserve energy spot welding machines, it is characterized in that, described welding control section also comprises the charge power supply control module that links to each other with described voltage stabilization and current stabilization Switching Power Supply charger, so that the input of described operational order drives the stable electric current and voltage of described voltage stabilization and current stabilization Switching Power Supply charger output with processing module.

6. reserve energy spot welding machine according to claim 2 is characterized in that, described device for power switching is the IGBT power device; The gate pole of described IGBT power device links to each other with described driver element, and drain electrode links to each other with an end of described bank of super capacitors, and source electrode links to each other with described welding contact.

7. reserve energy spot welding machine according to claim 2 is characterized in that, described device for power switching is a high-power MOSFET tube; The grid of described MOSFET pipe links to each other with described driver element, and drain electrode links to each other with an end of described bank of super capacitors, and source electrode links to each other with described welding contact.

8. reserve energy spot welding machine according to claim 1 is characterized in that, described bank of super capacitors is the monomer series-connected composition of ultracapacitor that 10 capacity are 500F.

9. reserve energy spot welding machine according to claim 1 is characterized in that, described bank of super capacitors is the monomer series-connected composition of ultracapacitor that 20 capacity are 2000F.

10. according to Claim 8 or 9 arbitrary described reserve energy spot welding machines, it is characterized in that described ultracapacitor monomer is double electric layers supercapacitor, electric chemical super capacitor or hybrid super capacitor.

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