KR100279655B1 - Welding Torch Collision Prevention and Leak Recognition Device for Automatic Transfer - Google Patents

Abstract

The present invention relates to a collision avoidance and leak recognition device of a welding torch for automatic transfer, when the operator welds the inside of a small pipe or nozzle that can not be observed, conventionally because the transfer of the welding torch proceeds as input only Problems such as welding torch collision and equipment damage caused by inability to recognize the environment, and cooling water must be circulated in order to prevent overcooling of the welding torch. Reasons for storage container damage, circulation line breakage and relaxation When the coolant is leaked has a problem such as fatal welding failure.

In order to solve this problem, the present invention comprises a proximity switch (1) for detecting the deformation of the welding object by the welding and the presence or absence of protrusions in the interior of the welding torch unit (1 to 7) to receive a detection signal and abnormal noise and Generates a display function on the screen and receives the detection signal by the water level detection device 9 which detects the operation of the welding torch and the return to the origin and the presence of the coolant leakage due to an abnormal occurrence. The problem is solved by generating a function and controlling the associated welding power supply 12 with the above functions with the remote control panel 13 to operate this function.

Description

Welding torch collision prevention and leakage recognition device for automatic transfer

The present invention relates to a welding torch used as part of a gas tungsten arc welding (GAS SHIELED TUNGSTEN ARC WELDING) device, which is a type of special welding. The present invention relates to a welding torch capable of controlling a function of preventing a welding torch from colliding with a welding object and a function recognized for leakage of a coolant that cools the welding torch to prevent the cooling of the welding torch.

Gas tungsten arc welding is mainly used for special purpose welding because of its excellent weldability. It is a welding method that is widely used for extruding welding of pipes, tubes, nozzles, etc. which require corrosion resistance and corrosion resistance during the production of power generation equipment or chemical vessels. .

However, according to the automation trend of welding, the welding equipment is switched from the manual operation to the automatic operation, and the welding work such as the inside of the pipe that the welding worker is difficult to observe, that is, the working condition is poor and the worker's access is reduced. Manual welding is difficult due to the difficult work and the size of the conventional torch, and the work has been focused on automation. It is becoming.

However, even if the conventional automatic transfer method of the welding torch is adopted as described above, the deformation of the welding object due to the heat input of the welding and the prediction of the welding failure are unsatisfactory, the coolant leakage area is increased due to the miniaturization of the welding torch, the welding operation input or the welding torch transfer instruction only. Due to such limitations, it was impossible to cope with various environments.

As a result, when welding torch collides or leaks coolant in the state of inadequate coping ability due to the occurrence of projecting environment, incorrect operation of the equipment and the influence of input power fluctuation, and the lack of precognition, it is a continuous welding operation in the unrecognized state. Breakage of the welding device or welding failure of the workpiece can not be avoided, causing a lot of damage to the work.

The present invention has been made in order to improve the above problems, generally automatic welding requiring long-distance control due to poor working environment, such as high temperature and internal welding that can not be observed by the operator, in particular, small internal pipes or nozzles The present invention provides a device configuration capable of preventing the collision of the welding torch and leaking of the coolant, which is required when transferring the welding torch in welding, and a device having a welding torch control function based thereon.

In other words, when the welding torch is automatically transported by avoiding the disadvantages of the conventional automatic torch welding torsion, it prevents the collision that may occur due to not being aware of the working environment, and also provides an automated program for cooling water leakage during operation. In connection with the cycle, an abnormal noise is generated and at the same time, the welding torch continues to be stopped.

In addition, by displaying the recognition mark on the monitor to enable prior recognition of the operator, it is possible not only to secure the ability to cope with the changed working environment, but also to connect the automatic rapid return function of the welding torch to the conventional torch driving unit to minimize the work defect By fabricating the torch, it is also applicable to automatic or semi-automatic welding torches of other welds, including gas tungsten arc welding.

1 is an overall schematic view of a welding torch for automatic transfer with an anti-collision and leakage recognition device according to the present invention,

(Description of Drawing Major Symbols)

1 ... proximity switch, 2 ... gas cup,

3 ... weld guide, 4 ... torch body,

5 ... cooling water inlet tube, 6 ... gas inlet tube,

7 coolant return tube, 8 torch drive,

9 ... level sensor, 10 ... coolant pump,

11 ... cooling water reservoir, 12 ... welding power supply,

13 ... remote control panel, 14 ... electrode,

15 ... welding rod, 16 ... contact.

Hereinafter, the configuration and operation of the present invention in detail based on the drawings.

As shown in Fig. 1, the welding torch device for automatic transfer is largely divided into welding torch parts 1 to 2, torch driving part 8, cooling device parts 9 to 11, welding power supply device 12, remote control panel ( 13).

Among them, the part corresponding to the present invention is mounted inside the welding torch parts 1 to 7 to perform the welding operation with the proximity switch 1 for recognizing the proximal distance of the protruding portion of the welding progression part, or to recognize the proximate distance. It consists of a function of controlling the torch drive unit 8 to be driven by the remote control panel (13).

Then, the water level detecting device (9) mounted inside the cooling water storage container (11) as the cooling device parts (9 to 11) for detecting the level of the cooling water, which is constantly defined by the closed circulation circuit, and the cooling water pump for circulating the cooling water ( 10) and a function of controlling the welding power supply device 12 for operating them with the remote control panel 13.

In order to prevent the welding torch collision, the proximity switch 1 is fixed to the torch body 4 by using a fixing plate, and installed toward the grooved position of the torch cover. Is embedded in a plate for noise isolation and protected with insulation in a way that prevents electrical shorts.

The connecting cable uses a separate wire to prevent an error caused by the influence of the input cable, and connects directly to the emergency return circuit in the electric circuit that transfers the torch drive unit 8 among the PLC circuits of the remote control panel 13, in which case the remote A dimming lamp and a small speaker are installed in parallel with the extra operation switch in the control panel 13.

For the leak recognition device of the welding torch, since a simple coolant circulation system is generally operated by the coolant pump 10 at the same time as the start of the welding arc, a separate circulation system is not required, but the coolant reservoir 11 detects a change in flow rate. In order to facilitate the manufacture of a larger shape than the width (can be connected to a separate small storage container).

The water level detecting contact 16 is attached to be adjusted up and down in preparation for the need for vertical movement, and the wiring of the water level sensing device 9 is a torch driving unit among the starting circuit of the coolant pump driving motor and the PLC circuit of the remote control panel 13. (8) Directly connect to the emergency return circuit in the electric circuit for conveying, and install the dimming lamp and the small speaker in parallel at the extra operation switch in the remote control panel (13).

When the operation of the present invention having such a configuration is described by way of example, the remote control panel 13 adjusts the distance required for proper recognition of the proximity switch 1, adjusts other welding parameters, and then introduces a welding start switch. The gas is supplied to the electrode 14 portion in the gas cup 2 through the gas inlet tube 6 on the lower surface to generate a welding arc, and the torch driving portion 8 starts to move forward while the electrode guide tube 3 starts to move forward. Welding of the object to be welded is carried out with the electrode 15 inside.

After adjusting the distance required for proper recognition of the proximity switch 1 in the remote control panel 13 and adjusting other welding parameters, the welding start switch is inserted into the gas cup 2 through the gas inlet tube 6 from the gas supply source. Gas is supplied to the electrode 14, which is formed between the welding torch and the base material to be welded to generate a welding arc, and at the same time, an electrode is formed between the welding torch and the base material to be welded to generate a welding arc. At the same time, the torch driving unit 8 performs welding of the object to be welded with the welding rod 15 in the welding guide tube 3 while starting the advancement.

In this way, the electrode is formed by applying a welding rod or a welding base material due to the high temperature generated by the generation of the welding arc. In order to perform automatic welding or heat input welding, a high power source is supplied from the welding power supply device 12 to the welding torch. Since high heat is normally generated in the welding torch when welding, this heat is cooled with cooling water for continuous welding.

That is, in order to start welding, the welding start switch is pressed in the welding power supply device 12. At this time, a welding current and a welding voltage are induced through the welding power supply device 12 formed of the welding operation device and the welding power conversion device to the welding torch. At the same time, the cooling water pump 10 associated with the cooling water motor and the water level sensing device 9 also starts to operate to forcibly flow the cooling water to the torch body 4 to cool the welding torch. After passing through the electric solenoid valve port for opening and closing the coolant flow in the lower end of the welding power supply unit 12 through a tube or a hose in the storage container 11, the torch body 4 is circulated through the coolant inlet tube 5 to store the coolant again. The vessel 11 is recovered again through the cooling water recovery tube 7, and the tubes 5, 6, 7 are made of small diameter copper metal tubes or hoses.

If the coolant flows or is maintained when the welding operation is not performed, there is a possibility of generating an error and leaking of the coolant when detecting the water level, and also the cooling line is corroded, and the possibility of freezing of the cooling line due to the remaining coolant in winter. Due to this, there is no reason to flow the coolant to the torch body 4, so that the coolant line is installed in the electric solenoid valve of the welding operation device among the welding power supply devices 12, thereby keeping the level of the coolant storage container 11 constant. While the electric solenoid valve port does not flow in the closed state, the operating current is applied to the electric solenoid valve at the same time as the operation of the coolant pump 10, the valve port is opened to cool the water to the torch body (11) 4) to flow into.

Since the connection between the electric solenoid valve and the coolant transfer line should be freely bent due to the distance between the welding torch unit and the welding power supply 12, the coolant transfer line may be made of a small diameter copper metal tube or hose of flexible material. The nipple is attached to the end of the connector and fastened to the inlet and outlet ports of the valve. At this time, the small diameter tube or hose is not directly connected to the power supply of the welding power supply 12, but is fastened to the cooling water inlet / outlet port screw portion with a nipple port, and transfer of the coolant flow when the port is opened and closed by an electric solenoid operation. And low pass.

As such, in the welding operation by the welding torch according to the present invention, at the same time as the cooling water level is maintained and the start of welding, the cooling water transfer must be controlled to maintain the cooling period of the welding torch, and such control is performed by the electric power of the lower end of the welding power supply 12. Since solenoid valve opening and closing operation is used, a small diameter copper metal tube or hose, which is a passage of the coolant flow, is connected to the electric solenoid valve inlet / outlet port of the lower end of the welding power supply 12 to control the flow of the coolant.

When the recirculated coolant is circulated, it forms a closed circuit so that the water level displacement before and after the circulation of the torch body 4 is kept constant, so that the contact point 16 of the water level detection device 9 is connected to the cooling water pump continuously. (10), but if the cooling water line breaks, leaks in the joint, etc. occurs, the cooling water level is reduced to open the contact of the water level detection device (9), thereby stopping the operation of the pump driving motor to cool the water pump ( 10) to stop operation.

In this way, while the coolant pump 10 is stopped, an electrical signal is input to the remote control panel 13 to generate an abnormal sound, and a warning indication is displayed on the screen, and at the same time, the torch driver 8 is returned to the origin to be reoperated.

In addition, when the welding torch progresses to a control abnormal state or deviates from the welding trajectory due to a misunderstanding of the welding deformation or protrusion, the wrong input of the torch driving, or the abnormality caused by the change of the input power during the welding process, Generates an abnormal sound on the remote control panel, displays a warning indication on the screen to inform the operator of the abnormality of the device, and automatically returns the torch drive unit 8 to the origin to resume operation.

Therefore, the control of the remote control panel 13 of the conventional welding torch is interconnected to the welding function, and the electrical configuration is achieved by generating an abnormal sound, displaying on the screen, and returning to the origin of the welding torch. Have it.

The present invention made up of the above objects and configurations, in the construction of the welding automation equipment, it is possible to prevent accidental collisions or leakage of the coolant caused by the unknown of the changing welding environment when automatically transferring the conventional welding torch, Welding defects can be prevented in advance to improve the reliability of welding equipment, and it is possible to remotely control manual equipment, which is difficult for the welding worker to access or work by visual measurement. The difficulty part can be easily welded.

Claims (3)

In the welding torch for automatic transfer of the gas tungsten arc welding device, A torch drive unit 8 driven by recognizing the proximity distance by the proximity switch 1 mounted inside the welding torch units 1 to 7; A water level sensor 9 mounted inside the coolant storage container 11 as the cooler units 9 to 11, a coolant pump 10 for circulating the coolant, and a welding power supply 12 for operating them; Welding torch collision prevention and leak recognition device for automatic transfer, characterized in that composed of a remote control panel 13 for controlling all of them. The method of claim 1, When an electric signal is generated when the proximity switch 1 recognizes the proximity distance, an abnormal sound is generated and displayed on the screen, so that the welding torch stops the conveyance and returns to the origin. And leak recognition devices. The method of claim 1, When the water level sensing device 9 of the coolant storage container 11 detects the level of water level displacement and generates an electric signal by detecting the coolant leak, an abnormal sound is generated and displayed on the screen, and the welding torch stops the feeding and returns to the origin. Welding torch collision prevention and leakage recognition device for automatic transfer characterized in that the return.