Voltage-stabilizing resistance welding machine

Abstract

The utility model discloses a voltage-stabilizing resistance welding machine, which belongs to the technical field of resistance welding machines and comprises a transformer, a controller connected with a primary side of the transformer, a feedback shaping module connected with the controller and a welding clamp connected with the feedback shaping module. And the welding clamp is respectively connected with the feedback shaping module and the secondary side of the transformer. Linear stepless adjustable feedback control is achieved through four-wire system feedback of the feedback shaping module, slow starting of the resistance welding machine is achieved through the controller, interference caused by a transformer is avoided, and it is guaranteed that the resistance welding machine works in a stable voltage state. The electric resistance welding machine solves the problems that the voltage of the electric resistance welding machine is unstable and interference is easy to generate.

Description

Technical Field

[0001] The utility model belongs to the technical field of resistance welding machines, in particular to a voltage-stabilized resistance welding machine. Background Art

[0002] Resistance welding machines are used for high-power welding. They usually use low-voltage and high-current to pass through the connector to generate heat and melt the tin-lead solder wire. Compared with the heat transfer heating method of the soldering iron, they have the advantages of uniform heating and faster speed. Since high-power resistance welding needs to provide a large current, a large voltage drop will be generated inside the transformer coil and on the lead wire. The large voltage drop can easily cause unstable voltage on the welded parts, unstable power supply, and unstable heat generation, resulting in uneven melting of the solder, resulting in problems with insufficient welding quality. The high-power transformers used in resistance welding have large inductance and large starting current, and are very easy to interfere with electrical appliances in the same circuit, causing computer freezes and black screens on monitors. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the utility model provides a voltage-stabilized resistance welding machine, which realizes linear stepless adjustable feedback control through the four-wire feedback of the feedback shaping module, and realizes the slow start of the resistance welding machine through the controller, thereby avoiding the interference caused by the transformer, ensuring that the resistance welding machine works under a stable voltage state, and solving the problems of unstable voltage and easy interference of the resistance welding machine.

[0004] In order to achieve the above-mentioned purpose of the invention, the technical solution adopted by the utility model is:

[0005] The utility model provides a voltage-stabilized resistance welding machine, comprising a transformer, a controller connected to the primary side of the transformer, a feedback shaping module connected to the controller, and a welding clamp connected to the feedback shaping module; the welding clamp is respectively connected to the feedback shaping module and the secondary side of the transformer.

[0006] The beneficial effects of the utility model are as follows: the utility model provides a voltage-stabilized resistance welding machine, which can obtain a feedback voltage signal when welding a workpiece at the end point of the welding clamp through a feedback shaping module, and compare the feedback voltage signal with a steplessly adjustable preset voltage signal to obtain a deviation from the preset voltage signal value. Based on the deviation, the controller can eliminate the voltage drop caused by the internal resistance of the transformer coil and the lead wire, and realize a slow start working mode, thereby eliminating the interference caused by the direct connection of a high-power transformer to the power grid, and making the resistance welding machine work stably at the voltage value of the preset voltage signal when working.

[0007] Preferably, the controller adopts a bidirectional thyristor; two main electrodes of the bidirectional thyristor are connected to the primary side of the transformer; and the gate of the bidirectional thyristor is connected to the feedback shaping module.

[0008] The beneficial effects of adopting the above-mentioned preferred scheme are as follows: in the utility model, the setting of the bidirectional thyristor ensures the slow start and smooth start of the transformer used for the resistance welding machine, does not cause impact on the power grid, and does not affect the electrical appliances in the same circuit, thereby ensuring the stability and safety of the resistance welding machine.

[0009] Preferably, the feedback shaping module comprises a control signal amplifier, an output voltage regulating submodule and a rectifier submodule;

[0010] The 6th terminal of the control signal amplifier is connected to the gate of the bidirectional thyristor; the 1st terminal and the 7th terminal of the control signal amplifier are both externally connected to the power supply VDD; the 3rd terminal of the control signal amplifier is connected to the output voltage regulation submodule; the 2nd terminal of the control signal amplifier is connected to the rectifier submodule.

[0011] The beneficial effects of adopting the above-mentioned preferred scheme are as follows: the feedback shaping module provided by the utility model provides a preset voltage signal through the output voltage regulating submodule, and converts the AC signal obtained from the welding clamp into a DC voltage signal through the rectifier submodule, and after comparing the DC voltage signal with the preset voltage signal, if there is a deviation, the output signal is output through the control signal amplifier to adjust the gate of the bidirectional thyristor, thereby controlling the triggering angle of the bidirectional thyristor, so that the voltage at both ends of the welding clamp is stable and consistent with the preset voltage signal.

[0012] Preferably, the output voltage regulation submodule adopts a variable resistor;

[0013] The first end of the variable resistor is externally connected to a power source VCC; the second end of the variable resistor is grounded; and the adjustment end of the variable resistor is connected to the third end of the control signal amplifier.

[0014] The beneficial effects of adopting the above-mentioned preferred scheme are as follows: the utility model adopts a variable resistor as an output voltage adjustment submodule. After the variable resistor is connected to the external power supply VCC, by adjusting its third terminal, i.e., the resistance adjustment terminal, it can realize four-wire feedback control of the output voltage, and can realize linear stepless adjustment, thereby providing a simple and adjustable basis for setting the corresponding stable welding voltage according to actual conditions.

[0015] Preferably, the rectifier module includes a capacitor and a rectifier bridge;

[0016] One end of the capacitor is respectively connected to the first end of the rectifier bridge and the second end of the control signal amplifier; the other end of the capacitor is connected to the fourth end of the rectifier bridge and grounded; the second end of the rectifier bridge is connected to the first end of the welding clamp and one end of the secondary side of the transformer; the third end of the rectifier bridge is connected to the second end of the welding clamp and the other end of the secondary side of the transformer.

[0017] The beneficial effects of adopting the above-mentioned preferred scheme are as follows: the utility model adopts a rectifier bridge to rectify the AC signal when the welding pliers weld the workpiece to obtain a DC voltage signal, and filters the rectified signal through a capacitor. After the DC voltage signal is compared with the preset voltage signal, the bidirectional thyristor can be adjusted through the control signal amplifier according to the deviation, so that the resistance welding machine can work in a stable voltage state. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a structural schematic diagram of a voltage-stabilized resistance welding machine in an embodiment of the utility model.

[0020] Figure 2 The present invention is a circuit diagram of a voltage-stabilized resistance welding machine in an embodiment of the present invention.

[0021] Among them: T1, transformer; U1, bidirectional thyristor; AR1, control signal amplifier; R1, variable resistor; D1, rectifier bridge; C1, capacitor; P1, welding clamp. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0023] like Figure 1 As shown, in one embodiment of the utility model, the utility model provides a voltage-stabilized resistance welding machine, including a transformer T1, a controller connected to the primary side of the transformer T1, a feedback shaping module connected to the controller, and a welding clamp P1 connected to the feedback shaping module; the welding clamp P1 is respectively connected to the feedback shaping module and the secondary side of the transformer T1.

[0024] One end of the primary side of the transformer T1 is connected to the first end of the controller; the second end of the controller and the other end of the primary side of the transformer T1 are externally connected to the mains; the third end of the controller is connected to the third end of the feedback shaping module; the first end of the feedback shaping module is connected to the first end of the welding clamp P1, and is connected to one end of the secondary side of the transformer T1 through the terminal corresponding to the first end of the welding clamp P1; the second end of the feedback shaping module is connected to the second end of the welding clamp P1, and is connected to the other end of the secondary side of the transformer T1 through the terminal corresponding to the second end of the welding clamp P1;

[0025] like Figure 2 As shown, the controller uses a bidirectional thyristor U1; the two main electrodes of the bidirectional thyristor U1 are connected to the primary side of the transformer T1; the gate of the bidirectional thyristor U1 is connected to the feedback shaping module. One main electrode of the bidirectional thyristor U1 serves as the first end of the controller and is connected to one end of the primary side of the transformer T1; the other main electrode of the bidirectional thyristor U1 serves as the second end of the controller and is connected to the mains with the other end of the primary side of the transformer T1; the gate of the bidirectional thyristor U1 serves as the third end of the controller and is connected to the third end of the feedback shaping module.

[0026] The feedback shaping module includes a control signal amplifier AR1, an output voltage regulating submodule and a rectifier submodule;

[0027] The 6th terminal of the control signal amplifier AR1 serves as the 3rd terminal of the feedback shaping module and is connected to the gate of the bidirectional thyristor U1; the 1st terminal and the 7th terminal of the control signal amplifier AR1 are both externally connected to the power supply VDD; the 3rd terminal of the control signal amplifier AR1 is connected to the output voltage regulating submodule; the 2nd terminal of the control signal amplifier AR1 is connected to the rectifier module.

[0028] The output voltage regulation submodule adopts a variable resistor R1;

[0029] The first end of the variable resistor R1 is externally connected to a power source VCC; the second end of the variable resistor R1 is grounded; and the adjustment end of the variable resistor R1 is connected to the third end of the control signal amplifier AR1.

[0030] The rectifier module includes a capacitor C1 and a rectifier bridge D1;

[0031] One end of the capacitor C1 is respectively connected to the first end of the rectifier bridge D1 and the second end of the control signal amplifier AR1; the other end of the capacitor C1 is connected to the fourth end of the rectifier bridge D1 and grounded; the second end of the rectifier bridge D1, as the first end of the rectifier feedback module, is respectively connected to the first end of the welding clamp P1 and one end of the secondary side of the transformer T1; the third end of the rectifier bridge D1, as the second end of the rectifier feedback module, is respectively connected to the second end of the welding clamp P1 and the other end of the secondary side of the transformer T1.

[0032] The working principle of the utility model is as follows: a voltage-stabilized resistance welding machine provided by the utility model can be widely used in the welding of radio frequency cables and situations requiring high-power heating welding. The voltage-stabilized resistance welding machine obtains an AC voltage signal at the position where the welding clamp P1 welds the welding workpiece as a feedback voltage signal, rectifies the feedback voltage signal through a rectifier bridge D1, and obtains a DC voltage signal after filtering through a capacitor C1; after the DC voltage signal is output from the rectifier bridge D1 to the control signal amplifier AR1, it is compared with a preset voltage signal adjusted at the variable resistor R1. If the comparison result shows that there is a deviation, after the control signal amplifier AR1 operates, a control signal for the gate of the bidirectional thyristor U1 is output to control the trigger angle of the bidirectional thyristor U1, so that the voltage at both ends of the welding clamp P1 is consistent with the voltage value of the preset voltage signal set at the variable resistor R1, so that the resistance welding machine provided by the utility model always works under voltage stabilization. The utility model ensures the power stability of the resistance welding machine during operation by providing a controller and a feedback shaping module, and is not affected by voltage fluctuations or line voltage drops; the voltage-stabilized resistance welding machine provided by the utility model starts smoothly, does not impact the power grid, and does not affect electrical appliances in the same circuit; the voltage-stabilized resistance welding machine provided by the utility model has stable welding quality, and the welding quality is significantly improved compared with conventional resistance welding machines.

[0033] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A voltage-stabilized resistance welding machine, characterized in that: The invention comprises a transformer, a controller connected to the primary side of the transformer, a feedback shaping module connected to the controller, and a welding clamp connected to the feedback shaping module; the welding clamp is respectively connected to the feedback shaping module and the secondary side of the transformer.

2. The voltage-stabilized resistance welding machine according to claim 1, characterized in that: The controller adopts a bidirectional thyristor; the two main electrodes of the bidirectional thyristor are connected to the primary side of the transformer; the gate of the bidirectional thyristor is connected to the feedback shaping module.

3. The voltage-stabilized resistance welding machine according to claim 2, characterized in that: The feedback shaping module includes a control signal amplifier, an output voltage regulating submodule and a rectifier submodule; The 6th terminal of the control signal amplifier is connected to the gate of the bidirectional thyristor; the 1st terminal and the 7th terminal of the control signal amplifier are both externally connected to the power supply VDD; the 3rd terminal of the control signal amplifier is connected to the output voltage regulation submodule; the 2nd terminal of the control signal amplifier is connected to the rectifier submodule.

4. The voltage-stabilized resistance welding machine according to claim 3, characterized in that: The output voltage regulation submodule adopts a variable resistor; The first end of the variable resistor is externally connected to a power source VCC; the second end of the variable resistor is grounded; and the adjustment end of the variable resistor is connected to the third end of the control signal amplifier.

5. The voltage-stabilized resistance welding machine according to claim 3, characterized in that: The rectifier module includes a capacitor and a rectifier bridge; One end of the capacitor is respectively connected to the first end of the rectifier bridge and the second end of the control signal amplifier; the other end of the capacitor is connected to the fourth end of the rectifier bridge and grounded; the second end of the rectifier bridge is connected to the first end of the welding clamp and one end of the secondary side of the transformer; the third end of the rectifier bridge is connected to the second end of the welding clamp and the other end of the secondary side of the transformer.

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