Device for automatically detecting the starting point and end point of lap seam welding of metal parts

Abstract

The present invention provides a device for automatically detecting the starting point and end point of lap seam welding of metal parts, comprising: an auxiliary power supply, a relay, and a PLC controller, wherein the auxiliary power supply, the relay, the welding component, and the workpiece form a small loop, when the welding component and the workpiece are in contact, the small loop is closed, the PLC controller detects the starting point, and controls the welding machine body to perform welding, when the welding component and the workpiece are separated, the small loop is disconnected, the PLC controller detects the end point, and controls the welding machine body to stop welding. The present invention solves the problems of long time, low efficiency, and failure to ensure full welding in the traditional welding process.

Description

Technical Field

[0001] The invention relates to the technical field of welding detection, in particular to a device for automatically detecting a welding start point and an end point of a lap seam welding of a metal part. Background Art

[0002] Seam welding is a resistance welding method in which the weldment is assembled into overlapping or diagonal joints and placed between two roller electrodes. The rollers pressurize the weldment and rotate, and power is continuously or intermittently supplied to form a continuous weld. Traditional resistance welding equipment often stops during the welding process for inspection to check the welding quality and whether it is fully welded, resulting in a long welding time, low efficiency, and failure to ensure full welding, which ultimately results in the storage area of ​​the workpiece, such as steel strip, being too large. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides a device for automatically detecting the starting point and end point of the lap seam welding of metal parts, which solves the problems of long welding process, low efficiency and failure to ensure full welding. The circuit formed between the auxiliary power supply, relay, workpiece and welding parts is used to detect whether the workpiece is between the welding wheels, and then the PLC controller is used to control the welding machine body to perform welding, thereby shortening the welding time and improving the welding efficiency. The technical solution adopted by the present invention is:

[0004] A device for automatically detecting the starting point and end point of a lap seam weld of a metal part, comprising:

[0005] Auxiliary power supply, relay, PLC controller; the auxiliary power supply, relay, welding parts and the workpiece to be detected form a small loop, the relay, PLC controller and welding machine body form a large loop, and the PLC controller can control the welding machine body to act.

[0006] The PLC controller can control the welding machine body to move and weld.

[0007] The PLC controller can collect the signal of relay closing or opening.

[0008] Furthermore, the auxiliary power supply is a 12V, 24V, or 36V regulated DC power supply.

[0009] Furthermore, the welding component includes a welding wheel and a clamp.

[0010] Furthermore, the welding wheel includes an upper welding wheel and a lower welding wheel.

[0011] More preferably, the relay is an electromagnetic relay.

[0012] The main circuit is powered by the mains.

[0013] The auxiliary power supply is connected to the clamp and one end of the relay coil, and the other end of the relay coil is connected to the lower welding wheel electrode.

[0014] The advantages of the present invention are as follows: the structure is simple; during the welding process, as long as the welding component contacts the workpiece, the small loop formed by the auxiliary power supply, the relay, the welding component and the workpiece is closed, and the welding machine body can be controlled by the PLC controller to power on and perform welding. The starting and ending points of the weld are automatically detected during the welding process, and automatic detection and welding are realized, which shortens the welding process time and ensures that the entire weld is fully welded. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the present invention working when it is combined with a welding machine body from a front view angle.

[0016] Figure 2 It is a schematic diagram of the present invention from a right angle.

[0017] Figure 3 Schematic diagram of the circuit of the present invention. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0019] like Figure 1 , Figure 2 , Figure 3 As shown, an embodiment of the present invention proposes a device for automatically detecting the starting point and end point of lap seam welding of metal parts, comprising: an auxiliary power supply 1, a relay 2, and a PLC controller 3; wherein the auxiliary power supply 1, the relay 2, the welding component 4, and the workpiece 9 form a small loop, and the relay 2, the PLC controller 3, and the welding machine body 5 form a large loop, and the PLC controller 3 can control the welding machine body 5 to act.

[0020] The PLC controller 3 can collect the signal of the relay 2 being closed or opened, so as to control the welding machine body 5 to move and weld.

[0021] The auxiliary power supply 1 can be a 12V, 24V, or 36V regulated DC power supply with low power consumption and high stability.

[0022] The welding component 4 includes welding wheels and clamps 6, wherein the welding wheels include an upper welding wheel 7 and a lower welding wheel 8. During operation, the workpiece is located between the upper and lower welding wheels, and the upper and lower welding wheels are combined with the workpiece to form a part of a small loop.

[0023] Relay 2 is an electromagnetic relay 2, which can transmit the signal of the small circuit to the large circuit in an electromagnetic form. The large circuit is powered by the mains.

[0024] The auxiliary power supply 1 is connected to the clamp 6 and one end of the coil of the relay 2, and the other end of the coil of the relay 2 is connected to the electrode of the lower welding wheel 8.

[0025] During operation, the PLC controller 3 controls the welding wheel of the welding machine body 5 to press down, rotate and move, and receives the signal of the relay 2 at the same time. When the welding wheel contacts the workpiece 9, the relay 2 is closed; when the welding wheel leaves the workpiece 9, the relay 2 is disconnected. The PLC collects the closing signal of the relay 2 to control the welding machine body 5 to weld the workpiece 9. When the relay 2 is closed, the PLC controller 3 detects the starting point and controls the welding machine body 5 to weld the workpiece 9; when the relay 2 is disconnected, the PLC controller 3 detects the end point and controls the welding machine body 5 to stop welding the workpiece 9, and controls the welding wheel to rise and the welding machine body 5 to return.

[0026] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. The core of the present invention is to use the loop formed between the auxiliary power supply 1, the relay 2, the workpiece 9, and the welding component 4 to detect whether the workpiece 9 is between the welding wheels. Therefore, all detection devices using this method belong to the protection scope of the present invention. Although the present invention is described in detail with reference to examples, ordinary technicians in this field should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A device for automatically detecting the starting point and end point of lap welding of metal parts, characterized in that: include: An auxiliary power supply (1), a relay (2), and a PLC controller (3); wherein the auxiliary power supply (1), the relay (2), the welding component (4), and the workpiece to be detected (9) form a small loop, and the relay (2), the PLC controller (3), and the welding machine body (5) form a large loop, and the PLC controller (3) controls the welding machine body (5) to perform an action.

2. The device for automatically detecting the starting point and end point of lap seam welding of metal parts according to claim 1, characterized in that: The PLC controller (3) controls the welding machine body (5) to move and weld.

3. The device for automatically detecting the starting point and end point of lap seam welding of metal parts according to claim 1, characterized in that: The PLC controller (3) collects signals indicating whether the relay (2) is closed or opened.

4. The device for automatically detecting the starting point and end point of lap seam welding of metal parts according to claim 1, characterized in that: The auxiliary power supply (1) is a 12V, 24V, or 36V regulated DC power supply.

5. The device for automatically detecting the starting point and end point of lap seam welding of metal parts according to claim 1, characterized in that: The welding component (4) comprises a welding wheel and a clamp (6).

6. The device for automatically detecting the starting point and end point of lap seam welding of metal parts as claimed in claim 5, characterized in that: The welding wheel comprises an upper welding wheel (7) and a lower welding wheel (8).

7. The device for automatically detecting the starting point and end point of lap seam welding of metal parts as claimed in claim 1, characterized in that: The relay (2) is an electromagnetic relay (2).

8. The device for automatically detecting the starting point and end point of lap seam welding of metal parts as claimed in claim 1, characterized in that: The large loop is powered by the mains.

9. The device for automatically detecting the starting point and end point of lap seam welding of metal parts as claimed in claim 6, characterized in that: The auxiliary power supply (1) is connected to the clamp (6) and one end of the relay (2) coil, and the other end of the relay (2) coil is connected to the electrode of the lower welding wheel (8).

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