Intelligent control protection device for electric welding machine

Abstract

The utility model provides an intelligent control protection device for an electric welding machine. The intelligent control protection device comprises a 24V direct-current power supply, a leakage protector, a control power supply circuit breaker, an intermediate relay, an alternating-current contactor, a current transformer, a PLC, an intelligent controller and the like. According to the current error when the electric welding machine stops using and the current error when the electric welding machine is used normally. A PLC is adopted to read current in an electric welding machine line, when the current value is smaller than a set value after the electric welding machine stops using, a timer in the PLC is started for timing, and after the timer reaches set time, a power failure signal is output to cut off a welding machine power supply. If the welding machine is reused within a set time, the welding machine can be directly used. According to the utility model, intelligent control protection of the electric welding machine is facilitated, and the function of automatic power off when the electric welding machine is not used by people is realized.

Description

Technical Field

[0001] This utility model relates to the field of electrical intelligent control, and more specifically, to an intelligent control and protection device for an electric welding machine. Background Technology

[0002] Traditional methods, including resistance regulation, semiconductor control, transformer control, and power supply control, all suffer from limitations in accuracy and stability, intelligence, adaptability, and scalability. Welding machines often operate under no-load conditions for extended periods after use, which can lead to problems such as machine burnout, cable leakage causing injury, and wasted energy. Therefore, we propose an intelligent control and protection device for welding machines. Utility Model Content

[0003] The purpose of this utility model is to address the problems raised in the existing background technology. To achieve the above-mentioned utility model objective, this utility model provides the following technical solution: an intelligent control and protection device for an electric welding machine, comprising a 24V DC power supply, a leakage current protector, a control power circuit breaker, an intermediate relay, an AC contactor, a current transformer, a PLC, and an intelligent controller. The leakage current protector is located on the side of the 24V DC power supply, the control power circuit breaker is located on the side of the leakage current protector, the intermediate relay is located on the side of the control power circuit breaker, the AC contactor is located below the leakage current protector, the current transformer is located below the AC contactor, the PLC is located on the side of the AC contactor, and the intelligent controller is located on the side of the intermediate relay.

[0004] As a preferred embodiment of this utility model, the 24V DC power supply, the leakage current protector, the control power circuit breaker, the intermediate relay, the AC contactor, the current transformer, the PLC, and the intelligent controller are disposed inside the housing.

[0005] As a preferred technical solution of this utility model, a door is provided on the outer side of the outer shell.

[0006] As a preferred embodiment of this utility model, the leakage current of the leakage current protection device is 30mA; the leakage current protection device has a leakage action time of 0.1s.

[0007] As a preferred embodiment of this utility model, the rated current of the control power circuit breaker is 10A; the short-circuit breaking capacity of the control power circuit breaker is 6kA.

[0008] As a preferred embodiment of this invention, the intermediate relay coil voltage is 24V; the intermediate relay coil contact capacity is 5A / 250VAC.

[0009] As a preferred embodiment of this utility model, the AC contactor has a rated voltage of 380V and a rated current of 20A.

[0010] As a preferred technical solution of this utility model, the current transformer has a transformation ratio of 100 / 5 and an accuracy class of 0.5.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: The solution of this utility model is equipped with an intelligent controller, which can use a program in a PLC to determine the current magnitude of the welding machine and control it accordingly. Finally, a circuit breaker cuts off the power supply, allowing the welding machine to automatically disconnect the power supply when it stops or when workers are performing auxiliary work during the welding process, thereby saving electricity, protecting the environment, and reducing energy consumption. Attached Figure Description

[0012] Figure 1 This is a structural schematic diagram of the present invention;

[0013] Figure 2 A top view of the structure provided for this utility model;

[0014] Figure 3 A schematic diagram of the left-side structure provided by this utility model.

[0015] The diagram shows

[0016] 1. 24V DC power supply; 2. Residual current device (RCD); 3. Control power circuit breaker; 4. Intermediate relay; 5. AC contactor; 6. Current transformer; 7. PLC; 8. Intelligent controller; 9. Housing; 10. Door. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.

[0018] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely illustrates some embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model. It should be noted that, in the absence of conflict, the embodiments of this utility model and the features and technical solutions within them can be combined with each other. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0019] Example 1: Please refer to Figures 1-3 An intelligent control and protection device for a welding machine includes a 24V DC power supply 1, a leakage current protector 2, a control power circuit breaker 3, an intermediate relay 4, an AC contactor 5, a current transformer 6, a PLC 7, and an intelligent controller 8. The intelligent control of the welding machine is divided into three parts: a direct start part, a remote control start part, and an automatic power-off part. The first part involves closing the control power supply and pressing the SB start button to control the circuit, energizing the coil of intermediate relay 4KA2, causing the KA2 open contact to close. The PLC 7 is programmed to control and energize the coil of intermediate relay 4KA1, thus enabling the welding machine to operate. The second part involves remotely controlling the circuit by closing button S2, energizing intermediate relay 4KA3, causing the KA3 open contact to close, and then the PLC 7 enables the welding machine to operate. The third part uses the PLC 7's internal program to check if the welding machine's current value falls below a specified range within ten minutes. If it does, the power is automatically cut off, stopping the welding machine; otherwise, it continues to operate.

[0020] The power module used adopts a 380V three-phase AC power supply, which can provide a stable and reliable power supply for the welding machine.

[0021] The remote controller allows for remote operation of the welding machine's switch.

[0022] During use, the program in PLC7 is used to judge the usage time of the welding machine, then the intelligent controller 8 controls the power supply, and finally the circuit breaker performs the power-off operation.

[0023] It is equipped with an intelligent controller 8, which uses a program in the PLC7 to determine the current of the welding machine and controls it accordingly. Finally, a circuit breaker cuts off the power, automatically disconnecting the power when the welding machine stops or when workers are performing auxiliary tasks during welding, thus saving electricity, protecting the environment, and reducing energy consumption.

[0024] In the intelligent control power supply box for welding machines, the intelligent control system is divided into three parts: direct start-up, remote start-up, and automatic power-off. The first part involves turning on the power supply and pressing the SB start button to energize the coil of intermediate relay 4KA2, causing the KA2 open contact to close. This, through PLC7 programming, energizes the coil of intermediate relay 4KA1, enabling the welding machine to operate. The second part involves remote control, closing button S2 to energize intermediate relay 4KA3, causing the KA3 open contact to close, again enabling the welding machine to operate via PLC7. The third part uses the PLC7's internal program to check if the welding machine's current value falls below a specified range within ten minutes. If it does, automatic power-off occurs, stopping the welding machine; otherwise, it continues operating. This system achieves automatic power-off if the welding machine is not used for 10 minutes, and allows remote start-up via the wireless remote control, achieving safety and energy saving.

[0025] Example 2: An intelligent control and protection device for an electric welding machine includes a 24V DC power supply 1, a leakage current protector 2, a control power circuit breaker 3, an intermediate relay 4, an AC contactor 5, a current transformer 6, a PLC 7, and an intelligent controller 8. The leakage current protector 2 is located on the side of the 24V DC power supply 1, the control power circuit breaker 3 is located on the side of the leakage current protector 2, the intermediate relay 4 is located on the side of the control power circuit breaker 3, the AC contactor 5 is located below the leakage current protector 2, the current transformer 6 is located below the AC contactor 5, the PLC 7 is located on the side of the AC contactor 5, and the intelligent controller 8 is located on the side of the intermediate relay 4.

[0026] The 24V DC power supply 1, the leakage current protector 2, the control power circuit breaker 3, the intermediate relay 4, the AC contactor 5, the current transformer 6, the PLC 7, and the intelligent controller 8 are disposed inside the housing 9.

[0027] The outer casing 9 is provided with a door 10. The leakage current of the residual current device 2 is 30mA; the leakage operating time of the residual current device 2 is 0.1s. The rated current of the control power circuit breaker 3 is 10A; the short-circuit breaking capacity of the control power circuit breaker 3 is 6kA. The coil voltage of the intermediate relay 4 is 24V; the coil contact capacity of the intermediate relay 4 is 5A / 250VAC. The rated voltage of the AC contactor 5 is 380V; the rated current of the AC contactor 5 is 20A. The transformation ratio of the current transformer 6 is 100 / 5; the accuracy class of the current transformer 6 is 0.5.

[0028] Example 3: An intelligent control and protection device for a welding machine is used at a construction site. The operator directly closes the control power circuit breaker 3 and presses the SB start button. The coil of intermediate relay 4 KA2 is energized, and its disconnect contact closes. Through PLC7 programming control, the coil of intermediate relay 4 KA1 is energized, the welding machine starts operating, and the worker performs welding operations.

[0029] When a worker needs to operate the welding machine from a remote location, the remote control device closes button S2, energizes intermediate relay 4KA3, closes its disconnect contact, and then controls the welding machine to start working via PLC7.

[0030] The automatic power-off function is used when, during the welding process, the worker pauses welding for other reasons, and the current value of the welding machine falls below the specified range within ten minutes. After judgment by the PLC7 internal program, the power is automatically cut off, causing the welding machine to stop running and saving electricity.

[0031] Example 4: An intelligent control and protection device for an electric welding machine was installed in a factory workshop.

[0032] When the operator directly turns on the control power and presses the SB start button, the coil of intermediate relay 4 KA2 is energized, which causes the KA2 disconnect contact to close. Through PLC7 programming control, the coil of intermediate relay 4 KA1 is energized, the welding machine runs normally, and the welding of the workpiece begins.

[0033] The remote control system allows workshop managers to close button S2 from their office, energizing intermediate relay 4 KA3. This causes KA3 to disconnect and close its contacts, which in turn activates the welding machine via PLC7, facilitating production scheduling.

[0034] During the welding process, if the welding machine is temporarily suspended due to adjustments in the production process, and its current value falls below the specified range within ten minutes, the PLC7 internal program will detect this and automatically perform a power-off operation to stop the welding machine from running, thus achieving the goals of energy saving and safety.

[0035] The above embodiments are only used to illustrate the present utility model and are not intended to limit the technical solutions described in the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, the present utility model is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present utility model, and all technical solutions and improvements that do not depart from the spirit and scope of the utility model, are covered within the scope of the claims of the present utility model.

Claims

1. An intelligent control and protection device for an electric welding machine, characterized in that, The device includes a 24V DC power supply (1), a leakage current protector (2), a control power circuit breaker (3), an intermediate relay (4), an AC contactor (5), a current transformer (6), a PLC (7), and an intelligent controller (8). The leakage current protector (2) is located on the side of the 24V DC power supply (1), the control power circuit breaker (3) is located on the side of the leakage current protector (2), the intermediate relay (4) is located on the side of the control power circuit breaker (3), the AC contactor (5) is located below the leakage current protector (2), the current transformer (6) is located below the AC contactor (5), the PLC (7) is located on the side of the AC contactor (5), and the intelligent controller (8) is located on the side of the intermediate relay (4).

2. The intelligent control and protection device for an electric welding machine according to claim 1, characterized in that, The 24V DC power supply (1), the leakage current protector (2), the control power circuit breaker (3), the intermediate relay (4), the AC contactor (5), the current transformer (6), the PLC (7), and the intelligent controller (8) are disposed inside the housing (9).

3. The intelligent control and protection device for an electric welding machine according to claim 2, characterized in that, The outer side of the outer casing (9) is provided with a door (10).

4. The intelligent control and protection device for an electric welding machine according to claim 3, characterized in that, The leakage current of the leakage current protection device (2) is 30mA; the leakage current action time of the leakage current protection device (2) is 0.1s.

5. The intelligent control and protection device for an electric welding machine according to claim 4, characterized in that, The rated current of the control power circuit breaker (3) is 10A; the short-circuit breaking capacity of the control power circuit breaker (3) is 6kA.

6. The intelligent control and protection device for an electric welding machine according to claim 5, characterized in that, The intermediate relay (4) has a coil voltage of 24V and a coil contact capacity of 5A / 250VAC.

7. The intelligent control and protection device for an electric welding machine according to claim 6, characterized in that, The AC contactor (5) has a rated voltage of 380V and a rated current of 20A.

8. The intelligent control and protection device for an electric welding machine according to claim 7, characterized in that, The current transformer (6) has a transformation ratio of 100 / 5 and an accuracy class of 0.5.

Images