JPH0615460A - Automatic water stop device for welding machine - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide an automatic water shut-off device for a welding machine, which is capable of accurate operation and highly sensitive detection. [Configuration] In the automatic water shutoff device for the welding machine according to the present invention,
A welding machine 1 having a welding unit 3 having a plurality of welding guns 4 is provided with a water supply pipe line 10 and a drainage pipe line 11, one end of which is connected to the welding gun 4, and the water supply pipe line 10 is provided. Also, detection means 20 and 23 for detecting the flow rate of the cooling water are provided in the drainage pipe 11, respectively, and these detection means 20 and 23 are connected to the control device 2 of the welding machine 1. At the two detection means 2
The detection signals sent from 0 and 23 are compared and detected, and the water is automatically stopped by the difference between the detection signals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic water shut-off device attached to a welding machine for simultaneously welding a large number of points, such as a multi-welding machine.

[0002]

2. Description of the Related Art As a conventional welding gun device, for example, FIG.
There is one shown in. That is, the welding gun 53 is attached to the tip of the arm 52 of the welding robot 51.
A drain hose 54, a water supply hose 55, an air supply hose 56, and one end of a welding cable 57 are connected to the welding gun 53. A flow switch 58 for detecting the flow rate of the cooling water is provided in the middle of the drain hose 54.
And a check valve 59 for preventing backflow, and the flow switch 58 is connected to the welding robot 5 via a signal cable 60.
1 is connected to the control panel 61.

[0003]

However, in the above-described conventional welding gun device, the welding gun 5 is used for sheet metal welding.
When the chip 3 or the like comes off, the flow rate of the cooling water is reduced, so the flow switch 58 detects the pressure drop due to this, and the control panel 61 stops the operation of the welding robot 51 based on this detection signal. Since the water supply hose 55 is in the water supply state and cannot stop the outflow of the cooling water, the work to be welded, the equipment and the like may be wet, and the work to be welded may be rusted or the device may be broken. Further, when there are many cooling water paths, a pressure difference does not occur much when the cooling water flows out, so that the flow switch 58 cannot detect a pressure drop, and the flow switch 58 and the like often operate erroneously.

Therefore, an automatic water stop device 6 as shown in FIG.
No. 2 is attached to the arm 52 of the welding robot 51 via the manifold 63 to maximize the pressure difference caused by chip removal or the like. That is, the automatic water shutoff device 62 includes a flow switch 64 that constantly detects the flow rate of cooling water, an air-driven cylinder valve 65, and the like. The flow switch 64 is located on the main body side of the welding robot 51 with respect to the manifold 63. A check valve 66 is provided between the drain hose 54 and the drain hose 54. The cylinder valve 65 is provided on the water supply hose 55 located on the welding gun 53 side with respect to the manifold 63, and the pipe 6
It is connected to the air supply hose 56 via 7 or the like. The cylinder valve 65 is configured to be opened and closed by the air in the air supply hose 56. In the figure, reference numerals 68 and 69 are signal cables whose one ends are connected to the flow switch 64 and the cylinder valve 65, respectively, and reference numeral 70 is a signal cable whose one end is connected to a robot control panel (not shown). , 6
The relay boxes 71 and 9 and 70 are grouped together and connected to each other. Reference numeral 72 is a welding cable.

In such an automatic water shutoff device 62,
When the tip of the welding gun 53 comes off, the flow switch 64 detects the pressure drop caused by the reduction of the flow rate of the cooling water. This detection signal is sent to the cylinder valve 65 and a robot control panel (not shown) to operate the cylinder valve 65 and simultaneously stop the operation of the welding robot 51.
When the cylinder valve 65 operates, the water supply hose 55 is closed, and accordingly, the cooling water does not flow toward the welding gun 53, and the outflow from the water supply hose 55 is automatically stopped.

However, in the above automatic water shutoff device 62, since only one flow switch 64 detects whether the set flow rate is normal or abnormal, the cooling tower installed in the factory ( When the flow rate was unstable, such as immediately after the start of a large pump that served as the water supply source for the entire factory, there was a risk that an abnormality would be detected even though the chip was not missing.

On the other hand, even in the case of a multi-welding machine, it is possible to provide the automatic water shut-off device 62 having the above-mentioned configuration on the water supply / drainage pipe on the primary side or on the branched water supply / drainage pipe. Not embodied due to its drawbacks.

That is, in the multi-welding machine, 1
Since the secondary side water supply / drainage pipeline is provided with a large number of secondary paths on the welding gun side, which is the secondary side, the pressure difference that occurs even if one of them runs out of the tip is small. ,
Detection by the flow switch is difficult. Even in the water supply / drainage line on the primary side, since the pressure and flow rate fluctuations are small, similar results are obtained. Therefore, in order for the multi-welding machine to perform an accurate operation, a water stop device and a detection device must be provided in each path on the welding gun side, which increases the equipment cost and is economically disadvantageous.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an automatic water shutoff device for a welding machine, which is capable of accurate operation and highly sensitive detection. .

[0010]

In order to solve the above-mentioned problems of the prior art, in the present invention, one end is connected to a welding machine provided with a welding unit having a plurality of welding guns. Water supply pipelines and drainage pipelines are provided, and detection means for detecting the flow rate of cooling water are respectively provided in the water supply pipelines and drainage pipelines, and these detection means are provided in the welding machine control device. The control device is made to compare and detect the detection signals sent from the two detection means, and the water is automatically stopped by the difference between the detection signals.

[0011]

[Operation] In the automatic water stop device of the welding machine according to the present invention,
Since water is automatically shut off by the difference in flow rate between the water supply pipeline side and the drainage pipeline side, accurate and highly sensitive operation can be detected, and it can be used even when the flow rate is unstable immediately after starting the cooling tower in the factory. In addition, even if this apparatus is one, it has a large number of paths, and it is possible to sufficiently cope with a multi-welding machine.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the illustrated embodiments.

1 and 2 show an embodiment of an automatic water shutoff device for a welding machine according to the present invention. In the figure, 1 is a multi-welding machine, and this welding machine 1 comprises three welding units 3 controlled by a control board 2.
Each of these welding units 3 has a plurality of welding guns 4 and is arranged at predetermined intervals. Welding gun 4
Is attached to a support frame 6 and the like installed on the upper part of the columns 5 on both the left and right sides, and a pair of welding electrodes 7 and 8 is provided on the lower part. Then, each welding gun 4 is configured to sandwich the workpiece to be welded between the welding electrodes 7 and 8 by operating the operating cylinder 9 and simultaneously perform predetermined spot welding in this state.

On the other hand, the welding machine 1 has a water supply pipe 1
0, a drainage conduit 11 and an air supply conduit 12 are arranged substantially parallel to each other, and one ends of these conduits 10, 11 and 12 are connected to a compression pump or the like (not shown). Further, at the other ends of the water supply pipeline 10 and the drainage pipeline 11,
Headers 15 and 16 having a large number of branch pipes 13 and 14 are provided at positions corresponding to the welding unit 3, and the branch pipes 13 and 14 of the headers 15 and 16 have a water supply hose 17 and a drain hose 18 respectively. One end of each of the hoses 17 and 18 is connected and the other ends of the hoses 17 and 18 are connected to a predetermined welding gun 4. The welding gun 4 and the water supply / drainage pipes 10, 11 are connected to each other via the water supply / drainage hoses 17, 18 and the headers 15, 16.

The water supply conduit 10 is provided with an air-driven cylinder valve 19 and a first flow sensor 20 for constantly detecting the flow rate of cooling water. Cylinder valve 19
Is configured to be opened and closed by the air in the air supply conduit 12 so as not to cause dust clogging. Therefore, the cylinder valve 19 is connected to the air supply conduit 12 via the pipe 21 and the like. Further, the drainage conduit 11 is provided with a check valve 22 for preventing backflow and a second flow sensor 23 that constantly detects the flow rate of the cooling water. That is, the automatic water shutoff device 24 of the welding machine 1 is composed of the cylinder valve 19, the first and second flow sensors 20, 23 and the like.

First and second flow sensors 20, 23
The internal propeller always rotates depending on the flow rate, and a detection signal (pulse signal) generated at this rotation speed is sent to the control panel 2. Therefore, one ends of the signal cables 25 and 26 are connected to the first and second flow sensors 20 and 23, and the other ends of the signal cables 25 and 26 are connected to the control panel 2. The cylinder valve 19 is also connected to the control panel 2 via a signal cable 27.

In the control panel 2, however, the detection signals sent from the first and second flow sensors 20 and 23 are constantly compared, and chip omission or the like is detected by the difference between the detection signals. . That is, when the control panel 2 detects the difference between the detection signals of the first and second flow sensors 20 and 23 based on the flow rate difference between the water supply conduit 10 and the drainage conduit 11, the control panel 2 causes the cylinder valve to A control signal is sent to 19 so that the cylinder valve 19 is activated.

In the automatic water shutoff device 24 of this embodiment,
If the tip of the welding gun 4 falls off during welding of the work, the cooling water leaks out of the pipeline and the flow rate on the side of the water supply pipeline 10 and the flow rate on the side of the drainage pipeline 11 do not match. A difference occurs in the detection signals sent from the two flow sensors 20 and 23 to the control panel 2. Along with this, the control panel 2 determines the abnormality of the welding gun 4 and the like, operates the cylinder valve 19, and at the same time stops the equipment such as the welding machine 1.

When the cylinder valve 19 is actuated, the water supply conduit 10 is closed, and accordingly, the cooling water does not flow toward the welding unit 3 side, and the outflow from the water supply conduit 10 is automatic. To be stopped. Further, when the welding machine 1 or the like is restored and used again, the chip missing or the like is repaired to eliminate the cause of the flow rate inconsistency, and then the reset button of the control panel 2 is pressed to move the cylinder valve 19 to the original position. Then, the operation state can be released by returning to the.

In the automatic water shutoff device 24 of the present embodiment, the water supply pipe line 10 is provided with the first flow switch 20 and the drainage pipe line 11 is provided with the second flow sensor 23.
Since the flow rate difference between the two pipelines 10 and 11 is detected by comparison, it can be used even when the flow rate is unstable immediately after starting the cooling tower installed in the factory, and the operating rate of the welding machine 1 can be increased. It will be possible. In addition, the automatic water stop device 2
If one welding machine 4 is provided, the welding machine 1 having a large number of water supply / drainage hoses 17 and 18 can be used, and is suitable for a device that simultaneously operates a plurality of welding guns 4 like a multi-welding machine.

The embodiment of the present invention has been described above.
The present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention.

For example, in the above-described embodiment, three welding units 3 having a plurality of welding guns 4 are arranged, and these three welding units 3 are controlled by one automatic water stop device 1. , Welding unit 3 by unit
Each of the above may be provided with the automatic water shutoff device 1. According to this, since the maintenance of the automatic water shutoff device 1 becomes easy, it is convenient to use a multi-welding machine having a large number of welding guns 4.

[0023]

As described above, the automatic water shutoff device for a welding machine according to the present invention is provided with detection means for detecting the flow rate of the cooling water in the water supply pipeline and the drainage pipeline, respectively. Is connected to the control device of the welding machine, the control device compares and detects the detection signals sent from the two detection means, and the water is automatically stopped by the difference between the detection signals. It is possible to minimize the outflow of cooling water when the tip of the welding gun comes off, etc.
It is possible to prevent rust and failure of the work to be welded and the facility device which are caused by getting wet with water. Also,
Since the automatic water shutoff device of the present invention shuts off water by the flow rate difference between the water supply pipe side and the drainage pipe side, it has excellent performance such as accurate operation and highly sensitive detection. And can be reliably controlled even with a multi-welding machine. Moreover, even in the case of a multi-welding machine having a large number of cooling water paths, it is possible to detect chip omission etc. of each path by the above-mentioned one automatic water stoppage device, so that it is possible to reduce the number of installations of water stoppage devices. The cost can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a front view showing an entire multi-welding machine according to an embodiment of the present invention.

FIG. 2 is an enlarged front view showing an automatic water shutoff device provided in the multi-welding machine.

FIG. 3 is an overall perspective view showing a conventional welding gun device.

FIG. 4 is an overall perspective view showing an automatic water shut-off device attached to a welding robot.

[Explanation of symbols]

 1 Multi Welding Machine 2 Control Panel 3 Welding Unit 4 Welding Gun 10 Water Supply Pipeline 11 Drainage Pipeline 12 Air Supply Pipeline 17 Water Supply Hose 18 Drainage Hose 19 Cylinder Valve 20 First Flow Sensor 21 Pipe 22 Non-return Valve 23 Second flow sensor 24 Automatic water stop device 25, 26, 27 Signal cable

Claims (1)

[Claims] 1. A welding machine provided with a welding unit having a plurality of welding guns is provided with a water supply pipe and a drainage pipe whose one end is connected to the welding gun, and the water supply pipe and the drainage pipe. Detection means for detecting the flow rate of the cooling water are respectively provided in the pipe lines, these detection means are connected to the control device of the welding machine, and the control device compares the detection signals sent from the two detection means. An automatic water shut-off device for a welding machine, which is configured to detect and automatically stop water based on a difference between the detection signals.