Wire filling device and TIG automatic welding system

Abstract

The utility model discloses a wire filling device and a TIG (Tungsten Inert Gas) automatic welding system in the technical field of inert gas welding, and aims to solve the problems of arc breaking, upward combustion, splashing and the like in an arc striking stage in the prior art. The method comprises the steps that the rotating speed of a motor is monitored through a velometer, after the rotating speed of the motor reaches a set threshold value, a motor control unit conducts negative feedback adjustment on the rotating speed of the motor, the rotating speed control unit controls current supply of a power panel to the motor, then the rotating speed of the motor is reduced, and the influence of too high wire filling speed caused by inertia of a wire feeding wheel is counteracted; the wire filling speed at the beginning of the main welding stage is approximately consistent with the set wire filling speed, so that the wire filling speed of a wire feeding wheel is quickly reduced to the set wire filling speed at the main welding stage, namely when the wire filling speed is not in an overshoot state in the arc striking stage, the welding arc striking success rate is high at the moment, and the phenomena of arc striking breaking and arc striking splashing are greatly reduced.

Description

Technical Field

[0001] The utility model relates to a wire filling device and a TIG automatic welding system, belonging to the technical field of inert gas welding. Background Art

[0002] For TIG (tungsten inert gas) automatic welding, the wire filling speed directly affects the state of the welding arc, the shape and quality of the weld. The wire filling speed can be set according to the welding method, welding process specifications, welding materials and other contents based on welding experience, which should ensure the stability of the welding process and the weld without defects. The welding process can be divided into three fixed time stages, the arc initiation stage, the main welding stage and the burn-back stage, such as Figure 1 As shown in the figure, usually within a period of time at the beginning of welding (t0~t1), due to the influence of the rotation inertia of the wire feeding wheel, the wire filling speed gradually increases to V1, at which time the wire filling speed is greater than the set wire filling speed V0, and then the wire filling speed will slowly drop to the set wire filling speed V0. During the time from t0 to t1, due to the high wire filling speed, that is, the wire filling speed is in an overshoot state at the initial stage of the main welding stage, it is easy to cause arc breaking, arc ignition and arc splashing in the arc starting stage. Utility Model Content

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a wire filling device and a TIG automatic welding system that can accurately control the wire filling speed during an arc striking period, thereby achieving the purpose of improving the arc striking state.

[0004] To achieve the above objectives, the present disclosure is implemented by adopting the following technical solutions:

[0005] In a first aspect, the present disclosure provides a wire filling device, comprising a motor, a wire feeding wheel transmission-connected to the motor, and a motor speed regulator, wherein the motor speed regulator comprises a speed meter, a motor control unit and a speed control unit, wherein the speed meter is electrically connected to the speed control unit by signals, the speed control unit is electrically connected to the speed control unit by signals, and the speed control unit is electrically connected to the motor and the power board, respectively;

[0006] The tachometer is used to measure the rotation speed of the motor, and the motor control unit is used to send a deceleration signal to the rotation speed control unit in response to the rotation speed of the motor reaching a threshold.

[0007] In some embodiments of the first aspect, the motor speed regulator is a PWM motor speed regulator.

[0008] In some embodiments of the first aspect, the model of the tachometer is Panasonic LAAD00279000, the model of the motor control unit is Panasonic LAAD00285000, and the model of the speed control unit is Panasonic WTDWV00579AA.

[0009] In the second aspect, the present disclosure also provides a TIG automatic welding system, comprising the wire filling device described in any embodiment of the first aspect, and also comprising a welding gun, a wire reel and a power supply, the welding gun is electrically connected to the wire filling device through a welding gun cable, the power supply is electrically connected to the power board, and the wire reel is connected to the wire feeding wheel through a wire feeding tube.

[0010] In some embodiments of the second aspect, a liquid cooling device is further included, wherein the liquid cooling device is electrically connected to the power supply, and the liquid cooling device is connected to the wire filling device through at least two water pipes.

[0011] In some embodiments of the second aspect, a gas cylinder is further included, and the gas cylinder is connected to the wire filling device through an air pipe.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The wire filling device provided by the present disclosure monitors the motor speed through a tachometer. After the motor speed reaches a set threshold, the motor control unit negatively feedback-adjusts the motor speed. The speed control unit controls the current supply of the motor by the power supply board, thereby reducing the motor speed, offsetting the influence of the excessive wire filling speed caused by the inertia of the wire feeding wheel. The wire filling speed at the beginning of the main welding stage is close to the set wire filling speed, so that the wire filling speed of the wire feeding wheel is reduced to the set wire filling speed more quickly in the main welding stage, that is, when the wire filling speed is not in an overshoot state in the arc starting stage, the welding arc starting success rate is high, and the arc starting and arc breaking and arc starting splashing phenomena are greatly reduced;

[0014] The TIG automatic welding system provided by the present disclosure has the same beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present disclosure or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 is a schematic diagram of a wire filling speed broken line of a wire filling device in the prior art;

[0017] Figure 2 is a schematic diagram of a wire filling speed broken line of the wire filling device provided in this embodiment;

[0018] Figure 3 is a schematic diagram of the connection structure of the wire filling device provided in this embodiment;

[0019] Figure 4 is a schematic structural diagram of a TIG automatic welding system provided in this embodiment;

[0020] Figure 5 is a schematic structural diagram of a wire filling device provided in this embodiment;

[0021] Figure 6 is with Figure 5 A schematic structural diagram of the wire filling device from an opposite perspective;

[0022] In the figure: 1-wire feeding wheel; 2-wire reel; 3-speed meter; 4-motor control unit; 5-motor; 6-speed control unit; 7-power board; 8-motherboard; 9-power supply; 10-welding gun; 11-control line; 12-wire feeding tube; 13-welding gun cable; 14-wire filling device; 15-liquid cooling device; 16-water pipe; 17-gas cylinder; 18-gas pipe. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present disclosure / the present application to clearly and completely describe the technical solutions in the embodiments of the present disclosure / the present application. Obviously, the described embodiments are only part of the embodiments of the present disclosure / the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present disclosure / the present application and its application or use. Embodiment 1

[0024] This embodiment provides a wire filling device 14 to solve the problem of high wire filling speed in the arc striking stage in the prior art.

[0025] refer to Figures 3 to 6 The wire filling device 14 provided in this embodiment includes a motor 5 and a wire feeding wheel 1 transmission-connected to the motor 5. The wire filling device 14 also includes a motor speed regulator. The motor speed regulator includes a speed meter 3, a motor control unit 4 and a speed control unit 6. The speed meter 3 is electrically connected to the speed control unit 6 by signals, and the speed control unit 6 is electrically connected to the speed control unit 6 by signals. The speed control unit 6 is electrically connected to the motor 5 and the power board 7, respectively.

[0026] The tachometer 3 is used to measure the rotational speed of the motor 5. The tachometer 3 sends the measured real-time rotational speed of the motor 5 to the motor control unit 4. The motor control unit 4 stores a set rotational speed threshold. The motor control unit 4 determines whether the real-time rotational speed of the motor 5 reaches the rotational speed threshold. The motor control unit 4 is used to send a deceleration signal to the rotational speed control unit 6 in response to the rotational speed of the motor 5 reaching the threshold. Since the rotational speed control unit 6 controls the power supply line of the power board 7 to the motor 5, the rotational speed control unit 6 reduces the input power of the motor 5, thereby reducing the rotational speed of the motor 5, and then reducing the wire filling speed of the wire feeding wheel 1.

[0027] refer to Figure 1 A complete welding process includes an arc striking stage, a main welding stage and a burn-back stage. When the wire filling device in the prior art is used for welding, in the arc striking stage, the motor 5 drives the wire feeding wheel 1 to accelerate to the maximum wire filling speed V1 and then the speed begins to decrease until it reaches the set wire filling speed V0. The wire filling speed V0 is the wire filling speed for normal welding in the main welding stage. A part of the decreasing range of the wire filling speed is actually within the main welding stage, that is, the main welding stage overlaps with the t0-t1 time period. The actual speed of this part of the interval is greater than the set wire filling speed V0, resulting in an overshoot state of the wire filling speed.

[0028] refer to Figure 2 When the wire filling device provided in this embodiment is used for welding, the speed threshold of the motor 5 is first set in the motor control unit 4. Figure 2 Corresponding to the middle threshold wire filling speed V2, during the arc initiation stage, the speed of the wire feeding wheel 1 increases, while the speed meter 3 continuously measures the speed of the motor 5 and sends it to the motor control unit 4. The motor control unit 4 compares the actual speed of the motor 5 sent by the motor control unit 4 with the speed threshold. When the wire filling speed of the wire feeding wheel 1 reaches or exceeds the threshold wire filling speed V2, that is, when the speed of the motor 5 reaches or exceeds the speed threshold, the motor control unit 4 sends a deceleration signal to the signal receiving end of the speed control unit 6. Since the speed control unit 6 controls the power supply of the motor 5, the speed control unit 6 reduces the speed of the wire feeding wheel 1 by reducing the output power of the motor 5. Comparison Figure 1 and Figure 2 In this embodiment, the maximum wire filling speed V1 is significantly lower than that of the prior art. Figure 2 The maximum wire filling speed V1 and the set wire filling speed V0 are smaller than the existing technology. Figure 1 , and then the speed when entering the main welding stage is also lower than the existing technology, and it is also faster than the existing technology to reduce to the set wire filling speed V0, alleviating the occurrence of wire filling speed overshoot.

[0029] Optionally, in other non-limiting embodiments of the present application, the threshold speed can be calculated by the threshold wire filling speed V2, V2=K*V0, K is the deceleration coefficient of the wire feeding wheel 1, and K has different values ​​under different set wire filling speeds V0. It is concluded from a large number of experiments that when 0<V0≤8m / min, the rotational inertia of the wire feeding wheel 1 has little effect on welding, and K is a fixed value; when V0>8m / min, the rotational inertia of the wire feeding wheel 1 has a greater effect on welding, and K is obtained by calling the internal database of the wire filling device 14. The larger the set wire filling speed V0, the smaller the deceleration coefficient K.

[0030] Optionally, in other non-limiting embodiments of the present application, the control scheme of the speed control unit 6 may be voltage regulation of the motor 5 or power frequency regulation of the motor 5 . Embodiment 2

[0031] This embodiment provides a wire filling device 14, which is improved on the wire filling device 14 provided in the first embodiment to enhance the technical effect. For details not provided, please refer to the first embodiment.

[0032] Embodiment 1 mentions the control scheme of the speed control unit 6. Optionally, in a further preferred but non-restrictive embodiment of the present application, the motor speed regulator is a PWM (Pulse Width Modulation) motor speed regulator, and the speed control unit 6 serves as an intermediary component between the power board 7 and the motor 5. After receiving the deceleration signal, the speed control unit 6 reduces the duty cycle of the input current pulse of the motor 5, and the average voltage obtained by the motor 5 is lower, thereby achieving deceleration of the motor 5.

[0033] Optionally, in a further preferred but non-limiting embodiment of the present application, the model of the tachometer 3 is Panasonic LAAD00279000, the model of the motor control unit 4 is Panasonic LAAD00285000, and the model of the speed control unit 6 is Panasonic WTDWV00579AA.

[0034] The wire filling device 14 provided in this embodiment can significantly reduce the overshoot state of the wire filling speed of the wire filling device 14 in the arc starting stage, thereby improving the success rate of the arc starting stage of welding and improving the phenomena of arc breaking and arc splashing. Embodiment 3

[0035] This embodiment provides a TIG automatic welding system, including the wire filling device 14 provided in the first or second embodiment, referring to Figure 3 , Figure 4 and Figure 5The TIG automatic welding system also includes a welding gun 10, a welding wire reel 2 and a power supply 9. The welding gun 10 is electrically connected to a wire filling device 14 through a welding gun cable 13. The welding gun 10 obtains welding energy through the wire filling device 14. The power supply 9 is electrically connected to a power board 7. The power supply 9 is a power board 7. At the same time, the power supply 9 is used to control the start and stop of the motor 5 of the wire filling device 14. The welding wire reel 2 is connected to the wire feeding wheel 1 through a wire feeding tube 12. Figure 5 The welding wire reel 2 can be directly and detachably mounted on the wire filling device 14, and the wire feeding wheel 1 extracts the welding wire from the welding wire reel 2 and delivers it to the welding gun 10. Figure 4 As shown, the motherboard 8 is also powered by a power supply 9 .

[0036] Optionally, in a further preferred but non-limiting embodiment of the present application, the TIG automatic welding system includes a liquid cooling device 15, the liquid cooling device 15 is electrically connected to the power supply 9, and the liquid cooling device 15 is connected to the wire filling device 14 through at least two water pipes 16, one of which is a water inlet pipe and the other is a water return pipe, and the efficiency of liquid cooling is relatively high. It also includes a gas cylinder 17, which is connected to the wire filling device 14 through a gas pipe 18, and the gas cylinder 17 stores the inert gas required for welding.

[0037] The TIG automatic welding system provided in this embodiment also has the same technical effects as those of Embodiment 1 or 2, which will not be described in detail here.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "provided at", "provided with", "located", "installed", "set", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. "Hinged" includes "rotational connection".

[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A wire filling device, comprising a motor (5) and a wire feeding wheel (1) drivingly connected to the motor (5), characterized in that: It also includes a motor speed regulator, the motor speed regulator including a speed meter (3), a motor control unit (4) and a speed control unit (6), the speed meter (3) being electrically connected to the speed control unit (6), the speed control unit (6) being electrically connected to the speed control unit (6), and the speed control unit (6) being electrically connected to the motor (5) and the power supply board (7) respectively; The speed meter (3) is used to measure the rotation speed of the motor (5), and the motor control unit (4) is used to send a deceleration signal to the rotation speed control unit (6) in response to the rotation speed of the motor (5) reaching a threshold value.

2. The wire filling device according to claim 1, characterized in that: The motor speed regulator is a PWM motor speed regulator.

3. The wire filling device according to claim 2, characterized in that: The model of the speed meter (3) is Panasonic LAAD00279000, the model of the motor control unit (4) is Panasonic LAAD00285000, and the model of the speed control unit (6) is Panasonic WTDWV00579AA.

4. A TIG automatic welding system, characterized in that: The invention comprises the wire filling device (14) as claimed in any one of claims 1 to 3, and further comprises a welding gun (10), a welding wire reel (2) and a power source (9), wherein the welding gun (10) is electrically connected to the wire filling device (14) via a welding gun cable (13), the power source (9) is electrically connected to the power board (7), and the welding wire reel (2) is connected to the wire feeding wheel (1) via a wire feeding tube (12).

5. The TIG automatic welding system according to claim 4, characterized in that: It also includes a liquid cooling device (15), wherein the liquid cooling device (15) is electrically connected to the power source (9), and the liquid cooling device (15) is connected to the wire filling device (14) via at least two water pipes (16).

6. The TIG automatic welding system according to claim 4, characterized in that: It also includes a gas cylinder (17), wherein the gas cylinder (17) is connected to the wire filling device (14) via an air pipe (18).

Images