TWM526452U - Handheld active control type stud welding machine - Google Patents

Description

Hand-held active control type nail spot welding machine

The present invention relates to a nail welding machine and a spot welding machine, and particularly relates to a hand-held active control type nail spot welding machine.

In today's automotive technology, in order to pursue fuel-saving, energy-saving, carbon reduction, lightweight development is the trend of the times, all car manufacturers are all in the new car models, using aluminum alloy or ultra-high tensile steel to reduce the weight of the car, and the above two new materials The use of this also brings new challenges to automotive repair equipment. The advancement of ultra-high tensile steel can obtain the same or higher body strength than the traditional iron body in thinner and lighter sheet metal. This material must reduce the heat input during welding due to the reduction of the thickness of the sheet to avoid the sheet. Because it is deformed by overheating, once the heat is too high, the sheet is easily oxidized, which is prone to rust after welding. At present, the thickness of the sheet metal of the traditional iron body is about 0.7~0.8mm, and Nissan Motor Co., Ltd. announced in 2013 that it will increase the application ratio of ultra-high tension steel of the new car to 25% by 2017, which will reduce the weight of the car. 15%, and at the 2014 Frankfurt Motor Show in Germany, the rumors about the new generation of ultra-high-tensile steel from Volkswagen in Germany are also very rampant, saying that the thickness of the future sheet metal will be 0.3mm thick. For thinner body panels, the traditional welding method will face great challenges. When dealing with such a new generation of materials, the welding time must be as short as possible to reduce the heat input and output current, otherwise it will easily make the plate heat affected zone Overheating, deterioration, rust, damage to plate rigidity and body safety.

Currently, commonly used welding equipment includes resistive spot welders (for iron body repair) and capacitive nail welders (for aluminum body repair).

Referring to the first figure, the resistance spot welding machine comprises a power input terminal, a power module, a control module and a main transformer 11. The two output ends of the main transformer 11 respectively serve as a welding torch 12 and a ground wire 13, wherein the power module can be The primary transformer 11 is turned on and off using an AC contactor or a bidirectional controllable switching device. If an AC contactor is used, the main transformer 11 can use a tapped transformer with a band switch to adjust the output current; In the group part, after the user sets the welding current and the welding time parameter, the power output triggering command is given, and the control module drives the power module to drive the signal. The shortcomings of the current resistance spot welder on the market are as follows: 1. Large volume, heavy weight, low integration, unable to be hand-held, and poor portability; 2. In addition to the main machine, the welding torch 12 and the ground wire 13, the welding torch 12 and the ground wire 13 are required. The cable is thick and heavy, not only high cost, but also the operating range of the operation is limited by the length of the cable; 3. The instantaneous input current is large, and the requirements for the power grid are high, so it can not be basically used for 110V single-phase use; 4. Output per unit time The energy is low, so the welding time is long, the heat input to the base metal is large, and the heat affected zone after welding is large, which is easy to make the heat affected zone of the plate large, overheated, deteriorated, rusted, and damage the rigidity of the plate and the safety of the vehicle body. Thin plate welding is more prominent, it is difficult to apply on the body made of ultra-high tension steel plate; 5. AC output, AC impedance loss is large; 6. Limited by the instantaneous output power, it is difficult to carry out aluminum nail welding, so it is impossible Repair the aluminum body.

Referring to the second figure, the current capacitive implant welding machine includes a power input terminal, a charging transformer 21, a rectifier 22, a charging controllable cymbal 23 and a charging resistor 24, an electrolytic capacitor 25, a discharge controllable cymbal 26, and a control module. The two output ends of the electrolytic capacitor 25 are respectively connected to the welding torch 27 and the grounding wire 28, and the discharge controllable cymbal 26 is disposed between the electrolytic capacitor 25 and the welding torch 27. The control module is set by the user to charge the voltage, and the control module drives the charging. Charging the electrolytic capacitor 25 with the controllable 矽23 The control module is provided with a voltage detecting circuit. If the electrolytic capacitor 25 does not reach the set voltage, it is charged. If the set value is exceeded, the discharge resistor is used for discharging. If the power output trigger command is received, the charging is stopped, and the charging is stopped. The discharge is discharged by the controllable crucible 26. At present, the shortcomings of the capacitive implant welding machine on the market are: 1. Large volume, heavy weight, low integration, unable to be hand-held, and poor portability; 2. In addition to the main machine, the welding torch 27 and the ground wire 28, the welding torch 27 and the ground wire are required. The cable of 28 is thick and heavy, not only high in cost, but also the range of operation is limited by the length of the cable; 3. The instantaneous output current is large and the output time is extremely short, but the use of a semi-control element such as a controllable 作为 is used as a discharge switching device. The output time is uncontrollable. When welding thin plates, such as ultra-high tension steel plate welding, if the output power is too high, it will cause blackening and penetrating. If the output power is too low, the welding will be weak and the success rate is low. 4. To offset the welding torch 27, The output of the ground cable 28 and other output cables must be connected in parallel with a large number of large electrolytic capacitors. The capacitance is large. Since the input and output currents are large during charging and discharging, the charging and discharging resistors are bulky and have high heat generation and high energy consumption. Since the output time is not controllable, it is difficult to perform the iron meson spot welding function, so the iron body cannot be repaired.

Since the output current of the capacitive implant welding machine can reach several thousand amperes, which is much larger than the maximum current of the field-effect transistor (MOSFET) of the commonly used full-control components, if the field effect transistor is used for control, multiple fields must be used. The effect transistor is shunted in parallel, but the existing welder structure and process can not achieve the balanced split of the field effect transistor, and the field effect transistor is easily burned. Therefore, the existing capacitive type nail welding machine only uses the controllable 矽 control electrolytic capacitor. Discharge.

At present, the resistance spot welding machine and the capacitive type nail welding machine respectively have their own shortcomings, and it is difficult to be compatible with materials such as iron, aluminum, ultra-high tensile steel plates, etc., that is, it is difficult to meet the future requirements of the automobile repair industry, therefore, development of a kind of energy The new welding machine suitable for welding iron, aluminum and ultra-high tension steel plates is an urgent problem to be solved in the field of auto repair.

In order to solve the above problems, the purpose of the present invention is to provide a hand-held active control type nail spot welding machine, which can realize high current welding, actively control the welding current output time, and effectively improve the welding effect.

The technical solution adopted by the present invention to solve the technical problem is: a hand-held active control type nailing spot welding machine, comprising a power module and an operating handle, wherein the operating handle is fixedly provided with a main control board, a charging and discharging circuit, and a power An output board and a soldering head; the power module is configured to convert a commercial power into a voltage required for charging the main control board and the charging and discharging circuit; the main control board receives an externally given output time setting, a charging voltage setting, and a gun switch The signal and the internal electrolytic capacitor voltage are compared, the charging and discharging circuit is charged, and the power output board is controlled; the charging and discharging circuit includes a charging switch and a plurality of charging and discharging units arranged in parallel, the charging and discharging unit including an electrolysis The capacitor and a discharge switch, the charge switch and the discharge switch are field effect transistor (MOSFET) controllable switches, and the charge switch and the discharge switch respectively control the electrolytic capacitor for charging and discharging; the power output board is according to the signal given by the main control board. The electrolytic capacitor is discharged by controlling the discharge switch, and the welding current is output to the welding head.

Further, the power module is a transformer power source or an inverter switch power source.

Further, the charge and discharge unit further includes a diode.

Further, the welding head is provided with an elastic gun head having a damping effect and a grounding bracket. When the welder utilizes a flexible gun head with a damping effect and a grounding bracket, it ensures the weld pressure protection. The certificate is good in electrical conduction, and the grounding bracket can help the welding piece to be fixed perpendicularly to the base metal, and has the grounding conductive function, which greatly shortens the distance between the welding point and the grounding wire.

The hand-held active control type nail spot welding machine of the present invention has the following advantages: 1. The whole welding machine is integrated on the operating handle, the integration degree is high, the volume is small, and the hand-held operation is convenient; 2. The unnecessary output cable and the ground wire are removed. , reduce the cost, and reduce the capacitance of the electrolytic capacitor; 3, using capacitive charging, low input current, low requirements on the grid; 4, using capacitive discharge, instantaneous output current is large, the welding point is very small when performing iron meson spot welding The back is not hot, black or rusty. When the aluminum nails are nailed, the sufficient output power makes the welding firm. The success rate is extremely high, and the iron-aluminum car is repaired. 5. The charging switch and the discharge switch are controlled by the main control. The component field effect transistor further reduces the volume, and realizes the active control of the charging time and the welding current output time, saves energy, and effectively improves the welding success rate; 6. The capacitor and the field effect transistor constitute a charging and discharging unit, and the plurality of charging and discharging units The shunt is shunted in parallel, and the field effect transistor and the electrolytic capacitor are controlled one-to-one to avoid burning the field effect transistor due to the current sharing problem, and can be used for large current control.

31‧‧‧Power Module

32‧‧‧Main control board

33‧‧‧Charge and discharge unit

331‧‧‧ electrolytic capacitor

332‧‧‧Discharge switch

333‧‧‧ diode

334‧‧‧Charge switch

34‧‧‧Power output board

41‧‧‧Operation handle

42‧‧‧welding head

421‧‧‧Flexible gun head

422‧‧‧ Grounding bracket

The first picture is a block diagram of the structure of the existing resistance spot welding machine; the second picture is a block diagram of the structure of the existing capacitive type nail welding machine; the third picture is the hand-held active control type nail of the present creation The block diagram of the structure of the spot welder; the fourth figure is the circuit diagram of the charge and discharge circuit of the present invention; the fifth figure is the perspective view of the hand-held active control type nail spot welding machine of the present invention.

Please refer to the third to fifth figures. The hand-held active control type nail spot welding machine provided by the present invention comprises a power module 31 and an operating handle 41. The main control board 32 is fixedly disposed on the operating handle 41, and is charged and discharged. Circuit, power output board 34 and soldering head 42.

The charging and discharging circuit includes a charging switch 334 and a plurality of charging and discharging units 33 arranged in parallel. The charging and discharging unit 33 includes an electrolytic capacitor 331 and a discharging switch 332. Each of the electrolytic capacitors 331 is correspondingly provided with a discharging switch 332, a charging switch 334 and The discharge switches 332 are all field effect transistor (MOSFET) controllable switches.

The power module 31 is configured to convert the commercial power into a voltage required for charging the main control board 32 and the charging and discharging circuit. The power module 31 can be a conventional transformer power source or an inverter switching power source.

The main control board 32 is connected to the charging switch 334 in the charging and discharging circuit, and is connected to the power output board 34. The main control board 32 operates the charging switch 334 to perform charging control on the electrolytic capacitor 331: the main control board 32 receives an externally given output time setting, charging voltage setting, gun switching signal, and receives the voltage of the internal electrolytic capacitor 331 to internally electrolyze. After the voltage of the capacitor 331 is compared with the set value of the charging voltage, if the voltage of the electrolytic capacitor 331 is lower than the charging voltage setting value, the main control board 32 controls the charging switch 334 to open to charge the electrolytic capacitor 331. Since the current and voltage for charging by the electrolytic capacitor 331 can be set to a lower value by the main control board 32, a field effect transistor (MOSFET) charging switch 334 can satisfy the charging current of the plurality of electrolytic capacitors 331, and the charging process can be performed. Take control.

The power output board 34 is connected to the main control board 32 and the discharge switch 332 in the charge and discharge circuit, respectively. The power output board 34 mainly performs discharge control on the electrolytic capacitor 331: the main control board 32 receives the signal that the gun switch is turned on, and feeds the signal back to the power output board 34, and the power output board 34 controls The discharge switch 332 is opened, and the amount of electricity stored in the electrolytic capacitor 331 is output to form a welding current, and the output time of the welding current is determined by an externally set output time setting value. When the electrolytic capacitor 331 is discharged, all the electric energy stored in the output capacitor in a short time, the current is large, and the output current merges to form a larger welding current, and flows to the welding head 42 for welding.

In order to achieve active controllable charging time and welding current output time, both the charging switch 334 and the discharging switch 332 adopt an actively controllable field effect transistor (MOSFET), and in order to solve the existing field effect transistor (MOSFET), the welding cannot be performed. For the problem of using a large current, the present invention proposes a scheme in which one diode 333, one discharge switch 332 and one electrolytic capacitor 331 constitute one charge and discharge unit 33, and then a plurality of charge and discharge units 33 are connected in parallel. Since each of the charging and discharging units 33 is provided with an electrolytic capacitor 331 and a field effect transistor (MOSFET) discharge switch 332, the capacity of the electrolytic capacitor 331 can be controlled so that the discharge current flowing through each of the discharge switches 332 does not exceed the field effect. The upper limit of the transistor, and the plurality of charge and discharge cells 33 are connected in parallel to obtain a large current for soldering. The charging time and the welding current output time can be controlled by the field effect transistor (MOSFET) of the full control component, and the plurality of discharge switches 332 and the electrolytic capacitor 331 are in one-to-one correspondence, thereby ensuring equalization of the split voltage of each field effect transistor, even if The destruction of any of the discharge switches 332 does not affect the output of the other sets of capacitors, making the discharge switch 332 suitable for high current control.

Further, the welding head 42 may be provided with an elastic tip 421 having a damping effect and a grounding bracket 422. When using the elastic gun head 421 with damping effect, the elasticity can be adjusted to ensure the welding point pressure to ensure good electrical conductivity, and the grounding bracket 422 can be fixed or inelastic or elastic to help the welding piece and the base material are vertically fixed, and has the ground wire. The conductive function greatly shortens the distance between the solder joint and the ground.

The hand-held active control type nail spot welding machine of the present invention has the following advantages: 1. The whole welding machine is integrated on the operating handle, with high integration, small size and convenient for hand-held operation; 2. Elimination of unnecessary output cables and ground wires, reducing cost and reducing the capacitance of electrolytic capacitors; Capacitive charging, low input current, low requirements on the power grid; 4, using capacitive discharge, instantaneous output current is large, the welding point is very small when performing iron meson spot welding, the back is not hot, black, rusty, and the aluminum nail is nailed. Sufficient output power during welding makes the welding success rate extremely high, and realizes the repair of the iron-aluminum car; 5. The charging switch and the discharge switch all adopt the main control component field effect transistor to further reduce the volume, and realize the charging time and welding. Active control of current output time, saving energy and effectively improving welding success rate; 6. Capacitor and field effect transistor form charge and discharge unit, multiple charge and discharge units are shunted in parallel, and field effect transistor and electrolytic capacitor are one-to-one control To avoid burning the field effect transistor due to the current sharing problem, it can be used for large current control.

The above description is only a preferred implementation manner of the present creation, and any technical solution that achieves the purpose of the present creation by substantially the same means is within the protection scope of the present creation.

31‧‧‧Power Module

32‧‧‧Main control board

331‧‧‧ electrolytic capacitor

332‧‧‧Discharge switch

34‧‧‧Power output board

41‧‧‧Operation handle

42‧‧‧welding head

421‧‧‧Flexible gun head

422‧‧‧ Grounding bracket

Claims (4)

A hand-held active control type nail spot welding machine comprises a power module and an operating handle, wherein the operating handle is fixedly provided with a main control board, a charging and discharging circuit, a power output board and a welding head; the power module is used for The utility power is converted into a voltage required for charging the main control board and the charging and discharging circuit; the main control board receives an externally given output time setting, a charging voltage setting, a gun switching signal and an internal electrolytic capacitor voltage, and the opposite charging The discharging circuit is charged, and the power output board is controlled; the charging and discharging circuit comprises a charging switch and a plurality of charging and discharging units arranged in parallel, the charging and discharging unit comprises an electrolytic capacitor and a discharging switch, and the charging switch and the discharging switch are field The utility model (MOSFET) controllable switch, the charging switch and the discharging switch respectively control the electrolytic capacitor for charging and discharging; the power output board controls the discharge switch to discharge the electrolytic capacitor according to the signal given by the main control board, and the output welding Current to the soldering tip. The handheld active control type nail spot welding machine according to claim 1, wherein the power module is a transformer power source or an inverter switch power source. The hand-held active control type nail spot welding machine according to claim 1, wherein the charge and discharge unit further comprises a diode. The hand-held active control type nail spot welding machine according to claim 1, wherein the welding head is provided with an elastic gun head having a damping effect and a grounding bracket.