阅读说明：本技术 自动检测金属件搭接缝焊焊接起点和终点的装置 (Device for automatically detecting welding start point and end point of metal piece lap seam welding ) 是由 庄海峰 李明杰 黄放 刘凯 于 2019-12-30 设计创作，主要内容包括：本发明提供一种自动检测金属件搭接缝焊焊接起点和终点的装置,包括：辅助电源、继电器、PLC控制器,其中辅助电源、继电器、焊接部件、工件形成一个小回路,当焊接部件和工件接触时,小回路闭合,PLC控制器检测到起点,控制焊机主体进行施焊,当焊接部件和工件分离时,小回路断开,PLC控制器检测到终点,控制焊机主体停止施焊。本发明解决了传统焊接过程时间长、效率低、不能保证满焊的问题。(The invention provides a device for automatically detecting a welding starting point and an end point of a lap seam welding of a metal piece, which comprises: the auxiliary power supply, the relay and the PLC are used for controlling the welding machine main body to weld, when the welding component is in contact with the workpiece, the small loop is closed, the PLC detects a starting point and controls the welding machine main body to weld, and when the welding component is separated from the workpiece, the small loop is disconnected, the PLC detects a terminal point and controls the welding machine main body to stop welding. The invention solves the problems of long time, low efficiency and incapability of ensuring full welding in the traditional welding process.)

1. An automatic detect metalwork overlap joint seam welding start point and terminal device, its characterized in that includes:

the device comprises an auxiliary power supply (1), a relay (2) and a PLC (programmable logic controller) (3); the auxiliary power supply (1), the relay (2), the welding part (4) and a workpiece (9) to be detected form a small loop, the relay (2), the PLC (3) and the welding machine main body (5) form a large loop, and the PLC (3) controls the welding machine main body (5) to move.

2. The apparatus for automatically detecting the start and end points of a lap seam weld of metal pieces as recited in claim 1,

the PLC controller (3) controls the welding machine main body (5) to walk and weld.

3. The apparatus for automatically detecting the start and end points of a lap seam weld of metal pieces as recited in claim 1,

and the PLC (3) acquires a signal for switching on or off the relay (2).

4. The apparatus for automatically detecting the start and end points of a lap seam weld of metal pieces as recited in claim 1,

the auxiliary power supply (1) is a 12V, 24V or 36V regulated DC power supply.

5. The apparatus for automatically detecting the start and end points of a lap seam weld of metal pieces as recited in claim 1,

the welding part (4) comprises a welding wheel and a clamp (6).

6. The apparatus for automatically detecting the start and end points of a lap seam weld of metal pieces as recited in claim 5,

the welding wheel comprises an upper welding wheel (7) and a lower welding wheel (8).

7. The apparatus for automatically detecting the start and end points of a lap seam weld of metal pieces as recited in claim 1,

the relay (2) is an electromagnetic relay (2).

8. The apparatus for automatically detecting the start and end points of a lap seam weld of metal pieces as recited in claim 1,

the large loop is powered by mains supply.

9. The apparatus for automatically detecting the start and end points of a lap seam weld of metal pieces as recited in claim 6,

and the auxiliary power supply (1) is connected with one end of 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 with the electrode of the lower welding wheel (8).

Technical Field

The invention relates to the technical field of welding detection, in particular to a device for automatically detecting a welding starting point and a welding finishing point of a lap seam of a metal piece.

Background

Seam welding is a resistance welding method in which a weldment is assembled into a lap joint or an oblique butt joint and is placed between two roller electrodes, rollers pressurize the weldment and rotate, and power is continuously or intermittently supplied to form a continuous weld. In the traditional resistance welding equipment, the welding process is often stopped for detection, the welding quality is checked, whether full welding exists or not is checked, the welding time is long, the efficiency is low, the full welding cannot be guaranteed, and finally, a workpiece such as a steel strip material storage area is overlarge.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a device for automatically detecting the welding starting point and the welding end point of metal piece lap seam welding, which solves the problems of long welding process time, low efficiency and incapability of ensuring full welding. The technical scheme adopted by the invention is as follows:

an apparatus for automatically detecting a start point and an end point of a lap seam weld of a metal member, comprising:

an auxiliary power supply, a relay and a PLC controller; the auxiliary power supply, the relay, the welding part and the workpiece to be detected form a small loop, the relay, the PLC and the welding machine main body form a large loop, and the PLC can control the welding machine main body to act.

The PLC controller can control the welding machine main body to walk and weld.

The PLC controller can acquire signals of closing or opening the relay.

Further, the auxiliary power supply is a regulated dc power supply of 12V, 24V, 36V.

Still further, the welding components include a welding wheel and a clamp.

Further, the weld wheel includes an upper weld wheel and a lower weld wheel.

More preferably, the relay is an electromagnetic relay.

The large loop is supplied with power by mains supply.

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

The invention has the advantages that: the structure is simple; in the welding process, as long as the welding part is in contact with the workpiece, the small loop formed by the auxiliary power supply, the relay, the welding part and the workpiece is closed, the PLC controller can control the welding machine main body to be electrified and welded, the start point and the end point of the welding line are automatically detected in the welding process, the welding is carried out while the automatic detection is carried out, the welding process time is shortened, and the full welding of the whole welding line is ensured.

Drawings

FIG. 1 is a schematic view of the front view of the present invention in operation with a welder body.

FIG. 2 is a right angle view of the present invention.

FIG. 3 is a circuit diagram of the present invention.

Detailed Description

The invention is further illustrated by the following specific figures and examples.

As shown in fig. 1, 2 and 3, an embodiment of the present invention provides an apparatus for automatically detecting a start point and an end point of lap seam welding of a metal member, including: the system comprises an auxiliary power supply 1, a relay 2 and a PLC 3; the auxiliary power supply 1, the relay 2, the welding part 4 and the workpiece 9 form a small loop, the relay 2, the PLC 3 and the welding machine main body 5 form a large loop, and the PLC 3 can control the welding machine main body 5 to act.

The PLC controller 3 can collect the signals of the on or off of the relay 2, thereby controlling the welding machine main body 5 to walk and weld.

The auxiliary power supply 1 is a voltage-stabilized direct-current power supply which can be 12V, 24V or 36V, and has small power consumption and strong stability.

The welding unit 4 comprises a welding wheel comprising an upper welding wheel 7 and a lower welding wheel 8, and a clamp 6, wherein the workpiece is located between the upper and lower welding wheels, and the upper and lower welding wheels and the workpiece are combined to form a part of a small loop during operation.

The relay 2 is an electromagnetic relay 2, and can transmit the signal of the small loop to the large loop in an electromagnetic mode, and the large loop is supplied with power by mains supply.

The auxiliary power supply 1 is connected with 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 with the electrode of the lower welding wheel 8.

During operation, PLC controller 3 control welding machine main part 5 welds the wheel and pushes down rotatory and walking, receives the signal of relay 2 simultaneously. When the welding wheel contacts the workpiece 9, the relay 2 is closed; when the wheel leaves the workpiece 9, the relay 2 is opened. The PLC acquires a closing signal of the relay 2 to control the welding machine main body 5 to weld the workpiece 9. When the relay 2 is closed, the PLC 3 detects a starting point and controls the welding machine main body 5 to weld the workpiece 9; when the relay 2 is disconnected, the PLC 3 detects a terminal point, controls the welding machine main body 5 to stop welding the workpiece 9, and controls the welding wheel to ascend and the welding machine main body 5 to return.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solution of the present invention and are not limited, and the core of the present invention is to detect whether the workpiece 9 is between the welding wheels by using the loop formed between the auxiliary power supply 1, the relay 2, the workpiece 9 and the welding component 4, so that all the detection devices adopting this way belong to the protection scope of the present invention. Although the present invention has been described in detail with reference to examples, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.