KR20160032873A - Apparatus For Shutting Off Cooling Water Of Welding Gun - Google Patents

Apparatus For Shutting Off Cooling Water Of Welding Gun Download PDF

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Publication number
KR20160032873A
KR20160032873A KR1020140123534A KR20140123534A KR20160032873A KR 20160032873 A KR20160032873 A KR 20160032873A KR 1020140123534 A KR1020140123534 A KR 1020140123534A KR 20140123534 A KR20140123534 A KR 20140123534A KR 20160032873 A KR20160032873 A KR 20160032873A
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KR
South Korea
Prior art keywords
cooling water
welding gun
water inlet
cylinder
valve
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Application number
KR1020140123534A
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Korean (ko)
Inventor
임종찬
Original Assignee
(주) 에이트론
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Application filed by (주) 에이트론 filed Critical (주) 에이트론
Priority to KR1020140123534A priority Critical patent/KR20160032873A/en
Publication of KR20160032873A publication Critical patent/KR20160032873A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/36—Auxiliary equipment

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Resistance Welding (AREA)

Abstract

The present invention relates to an apparatus to shut off a cooling water of a welding gun in order to prevent leakage by blocking the cooling water leaking from the welding gun on replacing a tip of the welding gun. The apparatus comprises: a casing having an inlet to introduce the cooling water and an outlet to discharge the cooling water; an injection hole of the cooling water provided on a flow channel between the inlet and the outlet, and connected with the inlet of the welding gun to supply the introduced cooling water towards the welding gun; a receiving hole of the cooling water provided on the flow channel between the inlet and the outlet, and connected with the outlet of the welding gun to connect the cooling water discharged from circulation of the welding gun within the flow channel; a cylinder installed between the inlet and the injection hole of the cooling water, providing a space to store the cooling water; and a piston apparatus coupled to the cylinder to generate a negative pressure inside the cylinder by a piston movement.

Description

[0001] Apparatus For Shutting Off Cooling Water Of Welding Gun [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding gun cooling water shielding apparatus, and more particularly, to a welding gun cooling water shielding apparatus for preventing water leakage by blocking cooling water leaking from a welding gun when a tip installed on a welding gun is replaced.

Robot welders are widely used for spot welding between steel plates or steel plates and structural members in automobile body welding lines and the like. Robot welder is an essential equipment in automobile assembly line because it can perform various motions according to program and work quickly. The tip of the welding gun of the robot welder is fitted with a tip. The tip is a consumable product that needs to be replaced periodically because it is worn according to usage because it is a discharge area.

The inside of the welding gun is supplied with cooling water for cooling the heated tip.

The fingers of the tip and weld gun are press-fit to allow easy replacement. That is, in the conventional welding gun, tapers are formed on the outer peripheral surface of the finger of the welding gun and the inner peripheral surface of the tip hole. Therefore, when the tips of the welding gun are inserted into the fingers, they are tightly coupled, and when the tip is rotated a little, they are easily separated.

Since the replacement work of the tip is not so difficult, conventionally, it has been dependent on the manual operation of the operator. In some cases, the tip is exchanged by a mechanical method as proposed by the present inventor.

On the other hand, when changing the tip, the cooling water supplied to the welding gun must be shut off by a valve such as a water valve. Otherwise, coolant will continue to flow through the open end of the weld gun during tip exchange. Consequently, even when the welding gun tip is exchanged by a mechanical means, the operator must perform a preceding work to cut off the cooling water supplied to the welding apparatus. And the cooling water that remained in the welding gun was inevitably poured into the workplace. The amount of cooling water that can be discharged each time you change the tip is negligible (for example, to 1 liter), so that near the workplace is always flooded with water. This phenomenon not only inconveniences the operation but also risks the risk of safety accidents.

Korean Patent Application No. 10-2012-0073461 Korean Patent Application No. 10-2012-0083701

It is an object of the present invention to solve the above problem and to provide a welding gun cooling water shutoff device for preventing cooling water supplied to a welding gun tip from flowing away from a welding gun during replacement of a welding gun tip.

The above object is achieved by the present invention, which is provided between a cooling water supply line and a welding gun to prevent the cooling water, which has remained on the welding gun at the time of tip replacement of the welding gun,

A casing having a cooling water inlet through which the cooling water flows and a cooling water outlet through which the cooling water is discharged; A cooling water supply port provided on the flow path between the cooling water inlet port and the cooling water outlet port and communicating with the cooling water inlet port of the welding gun for supplying the incoming cooling water toward the welding gun; A cooling water inlet provided on a flow path between the cooling water inlet and the cooling water outlet, the cooling water outlet communicating with the cooling water outlet of the welding gun so as to connect the cooling water circulating the welding gun to the flow passage;

A cylinder provided between the cooling water inlet and the cooling water supply port to provide a space for storing cooling water; A piston mechanism which is coupled to the cylinder to perform a piston movement to thereby form a negative pressure inside the cylinder;

The welding gun cooling water shielding apparatus according to claim 1,

According to another aspect of the present invention, a cooling water shutoff valve for shutting off the cooling water inlet and / or the cooling water outlet at the same time the piston mechanism is operated to bring the cylinder into a negative pressure state may be included.

According to another aspect of the present invention,

The cylinder, the cooling water inlet, the cooling water inlet, the cooling water inlet, and the cooling water outlet are connected to a joint tunnel provided in the casing in a vertical direction,

And a shut-off valve for shutting down the cooling water inlet and the cooling water outlet at the same time when the piston mechanism is operated to make the cylinder into a negative pressure state;

Wherein the cooling water inlet and the cooling water outlet are opened or closed while being vertically operated by pneumatic pressure in a state of being fitted in the joint tunnel,

A first valve fitted in the joint tunnel and actuated like a piston; And a second valve linearly connected to the first valve by a first connecting rod.

According to the above construction, the cooling water remaining in the welding gun is sucked and stored as a negative pressure when the tip is separated from the welding gun for replacement, and then a new tip is mounted. Then, the negative pressure is released and the cooling water is circulated again, When the tip of the gun is replaced, the water will not fall from the welding gun. Therefore, when the welding gun tip is exchanged by a mechanical method, the operator does not have to approach the welding gun to cut off the cooling water, and the cooling water rarely flows out, so that the workplace can be kept clean and the safety accident can be prevented.

1 is a circuit diagram of a welding gun cooling water shutoff apparatus according to an embodiment of the present invention.
2 is a schematic perspective view of a welding gun cooling water shutoff device according to an embodiment of the present invention.
Figs. 3 to 4 are front-end sectional views of the welding gun cooling water shielding device taken along the line AA in Fig.
Figs. 5 to 6 are schematic side cross-sectional views of the welding gun cooling water shielding device taken along the line BB in Fig. 2, showing operation states.
7 is a perspective view of a shut-off valve of a welding gun cooling water shutoff device according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. First, the basic matters will be described with reference to Figs. 1 to 3 first. In the drawings, the lines to which the cooling water is supplied are denoted by a thick solid line, and the lines to which the air pressure is supplied are denoted by a thick dotted line.

The welding gun cooling water shutoff device 1 of the present invention is provided between the cooling water supply pipe 3 and the welding gun 5 so that the cooling water remaining in the welding gun 5 when the tips 7, So as to prevent it from falling due to its own weight. The cooling water (C) circulates through the welding gun (5) and is discharged or recovered through the cooling water discharge pipe (11).

The welding gun cooling water shielding device 1 has a cylindrical casing 13 as a main body and forms a fluid circuit therein.

On one side of the casing (13), a cooling water inlet (15) through which cooling water flows and a cooling water outlet (17) through which cooling water is discharged are provided. The cooling water inlet 15 is connected to the cooling water supply pipe 3 and the cooling water outlet 17 is connected to the cooling water discharge pipe 11. The cooling water can be supplied from the water supply and the discharged cooling water can be recovered and reused after cooling.

Cooling water supply openings 19 and 19 'and cooling water inlet openings 21 and 21' are provided on the other side of the casing 13, respectively. The cooling water supply openings 19 and 19 'and the cooling water water inlet openings 21 and 21' may be provided in pairs, respectively. The cooling water is supplied to the upper tip 7 and the lower tip 9 of the welding gun 5, And so on.

The cooling water supply openings 19 and 19 'and the cooling water inlet openings 21 and 21' are installed on the flow path between the cooling water inlet 15 and the cooling water outlet 17. The cooling water flowing into the casing 13 circulates the welding gun 5 through the cooling water supply ports 19 and 19 'and the cooling water inlet ports 21 and 21' and is discharged from the casing 13.

That is, the cooling water supply ports 19 and 19 'communicate with the cooling water inlet 15 of the welding gun to supply the incoming cooling water to the welding gun 5. The cooling water inlet ports 21 and 21' So that the cooling water circulating in the cooling water outlet 17 can flow.

Inside the casing 13, a cylinder 23, 23 'for providing a space for storing cooling water is provided between the cooling water inlet 15 and the cooling water supply port 19, 19'. The cylinders 23 and 23 'are also provided in a pair. One for sucking and storing the cooling water filled in the flow path connected to the upper tip 7 and the other for sucking and storing the cooling water filled in the flow path connected to the lower tip 9. [

The welding gun cooling water shutoff device 1 of the present invention is installed in a bilaterally symmetrical shape as shown in FIGS. Therefore, in the following description, the constitution and operation will be described while giving only specific reference numerals to either one of them. And the description thereof will be omitted. Because they have a symmetrical relationship and work together at the same time. This will be described below with reference to Figs. 3 to 7. Fig.

A piston mechanism 25, 25 'for combining the pressure in the space inside the cylinder 23, 23' into the negative pressure (or negative pressure) state is coupled to the cylinder 23, 23 '. The piston mechanism 25 and 25 'includes a piston 27 which is held in a watertight state in the cylinders 23 and 23' to be frictionally moved with respect to the cylinder wall and a piston operating mechanism (29).

The piston 27 is in the form of a disk, and a piston ring 31 capable of simultaneously performing lubrication and watertightness is coupled to the circumferential wall thereof and is in contact with the inner wall 23a of the cylinder.

The piston rod 33 extends through the rear wall 23b of the cylinder to the outside, and a pneumatic action plate 35 is connected to the end of the piston rod 33. [ The pneumatic actuation plate 35 is also installed inside the pneumatic cylinder 37 for the same action as the piston 27. [ A first pneumatic flow path 39 is provided inside the pneumatic cylinder 37 to supply pneumatic pressure toward the front surface 35a (right surface in Fig. 3) of the pneumatic operation plate 35. [ One end of the first pneumatic passage 39 is connected to the pneumatic pressure generating portion 41 provided outside the casing 13 and the other end is opened in the space inside the pneumatic cylinder 37 and in front of the pneumatic action plate 35 .

A second pneumatic flow path (43) is provided in the pneumatic cylinder (37) to allow air to act on the rear surface (35b) of the pneumatic function plate. One end of the second pneumatic passage 43 is connected to the pneumatic pressure generating portion 41 provided outside the casing 13 and the other end of the second pneumatic passage 43 is opened inside the pneumatic cylinder 37 and toward the space behind the pneumatic operation plate 35 . When the pneumatic pressure is supplied through the second pneumatic flow path 43, the piston 27 is pushed to the right side in the figure to be in the state of 1 (a), 3 and 5, and the pneumatic pressure is supplied through the first pneumatic flow path 39 The piston 27 is pushed to the left side in the figure so that it is in a state of 1 (b), 4, or 6. As a result, the piston 27 is driven by air pressure and sucks the cooling water similar to the principle that the syringe sucks liquid. It is the solenoid valve 57 (see FIG. 1) that determines which of the first and second pneumatic flow paths 39 and 43 the air pressure generated by the air pressure generating portion 41 flows into. The solenoid valve 57 switches the supply direction of the air pressure based on an external signal.

1 (a), 3 (5) and 5 (5) in which the piston 27 is at the top dead center corresponds to a state in which cooling water is smoothly supplied to and recovered from the welding gun 5. 1 (b), 4, and 6 at the bottom dead center of the piston 27 indicate that the cooling water is shut off and the cooling water remaining in the welding gun 5 is sucked by the negative pressure, It corresponds to the state filling the space.

The capacity of the cylinder 23, that is, the size of the space for charging the cooling water, may be slightly different between right and left. The amount of cooling water contained up to the upper tip 7 of the welding gun 5 and the amount of cooling water contained up to the lower tip 9 of the welding gun 5 may be different.

According to the feature of the present invention, the shutoff valve 45, 45 'for operating the piston mechanism 25 to bring the cylinder 23 into a negative pressure state and at the same time shut off the cooling water inlet 15 is connected to the casing 13 Are provided on the joint tunnels 47 and 47 '. The joint tunnels 47 and 47 'are provided in the casing 13 in the vertical direction. The shutoff valves 45 and 45 'may be operated by the air pressure generated in the air pressure generating portion 41 (see FIG. 7). The solenoid valve actuates the shutoff valves 45 and 45 'in the vertical direction on the drawing (see FIGS. 2, 4, 5 and 6) by switching the supply direction of the air pressure.

The shut-off valves 45 and 45 'are also configured as a pair and installed symmetrically and simultaneously operate at the same time. Only one side will be described below.

The cooling water inlet 15, the cooling water inlet 19, the cooling water inlet 21 and the cooling water outlet 17 are connected to the joint tunnel 47. The cylinder 23 is also connected to the joint tunnel 47 by a cylinder connecting path 50. The shutoff valves 45 and 45 'are vertically operated while being fitted in the joint tunnel 47, and selectively open or close the respective passages.

The shut-off valve 45, 45 'includes a first valve 49, which is fitted into the joint tunnel 47 and starts like a piston; A second valve (53) linearly connected to the first valve (49) by a first connecting rod (51); And a guide 56 connected in a straight line to the first valve 49 by a second connecting rod 55 in the other direction of the first valve 49. As described above, the shutoff valves 45 and 45 'are operated by the air pressure generated in the air pressure generating portion 41. The signal applied to the solenoid valve 57 switches the supply direction of the air pressure. That is, the solenoid valve 57 simultaneously switches the operating direction of the air pressure supplied to the cylinders 23, 23 'and the air pressure supplied to the shut-off valves 45, 45'.

1 (a), 3 (5) and 5 (5) show the cooling water inlet 15, the cooling water inlet 19, the cooling water inlet 21 and the cooling water outlet 17 It is in an open state.

The cooling water inlet 15 communicates with the cooling water supply port 19 by the joint tunnel 47 and the cooling water inlet 21 communicates with the cooling water outlet 17. As a result, the cooling water flowing through the cooling water inlet 15 is supplied to the welding gun 5 through the cooling water supply port 19, and the cooling water flowing out of the welding gun 5 through the cooling water inlet 21 flows into the cooling water outlet Is discharged to the outside of the casing (13) through the opening (17).

When the welding gun tip replacement signal is applied, the solenoid valve 57 applies a pneumatic pressure to the first pneumatic flow passage 39 to cause the piston 27 to start to the left as shown in Fig. 4, (23) to suck the cooling water. At the same time, the shut-off valve 45 is operated so as to be in a lowered state as shown in FIG. 4 and FIG. In this state, the first valve 53 closes the cooling water inlet 15, and the second valve 53 closes the cooling water outlet 17. Accordingly, the cooling water is confined in the cylinder 23 by the negative pressure, and the cooling water is prevented from entering and exiting the casing 13. In Fig. 1 (b), the line in which the cooling water is blocked and sucked and becomes empty is indicated by a chain double-dashed line.

When the tips of the welding guns 7 and 9 have been exchanged, the pneumatic pressure is supplied to the second pneumatic passage 43 to move the piston 27 in the right direction as shown in FIG. 3 to cool the cooling water trapped in the cylinder 23 To be supplied to the welding gun (5). Therefore, the cooling water is supplied to the tips 7 and 9 immediately.

At the same time, the shutoff valves 45 and 45 'are operated by the air pressure so as to be in the states shown in FIGS. 3 and 5 and are supplied to the cooling water inlet 15, the cooling water inlet 19, the cooling water inlet 21, ) Are all opened.

Reference numeral 59 in Figs. 1 (a) and 1 (b) denotes a transformer for supplying a current to the welding gun 5, which is an electrical component in which high temperature is generated during operation. Cooling water must also be supplied to the transformer (59). It is not necessary to cut off the cooling water supplied to the transformer 59 so that the cooling water is always supplied even when the tip of the welding gun is exchanged.

The configuration shown and described above is merely a preferred embodiment based on the technical idea of the present invention. It will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention.

1: weld gun cooling water shutoff device 3: cooling water supply pipe
5: welding gun 7: upper tip
9: Lower tip 11: Cooling water discharge pipe
13: casing 15: cooling water inlet
17: Cooling water outlet 19, 19 ': Cooling water supply port
21, 21 ': inlet of cooling water inlet 23, 23': cylinder
25, 25 ': piston mechanism 27: piston
29: piston operating mechanism 31: piston ring
33: Piston rod 35: Pneumatic acting plate
37: pneumatic cylinders 39, 43: first and second pneumatic flow paths
41: Pneumatic pressure generating part 45, 45 ': Isolation valve
47, 47 ': Joint tunnel 49, 53: 1st and 2nd valves
50: Cylinder connection 51, 55: 1st and 2nd connecting rods
57: solenoid valve 59: transformer
C: Cooling water

Claims (4)

And is installed between the cooling water supply line and the welding gun to prevent the cooling water remaining on the welding gun from flowing due to its own weight when the tip of the welding gun is exchanged;
A casing having a cooling water inlet through which the cooling water flows and a cooling water outlet through which the cooling water is discharged;
A cooling water supply port provided on the flow path between the cooling water inlet port and the cooling water outlet port and communicating with the cooling water inlet port of the welding gun for supplying the incoming cooling water toward the welding gun;
A cooling water inlet provided on a flow path between the cooling water inlet and the cooling water outlet, the cooling water outlet communicating with the cooling water outlet of the welding gun so as to connect the cooling water circulating the welding gun to the flow passage;
A cylinder provided between the cooling water inlet and the cooling water supply port to provide a space for storing cooling water;
A piston mechanism which is coupled to the cylinder to perform a piston movement to thereby form a negative pressure inside the cylinder;
Wherein the welding gun cooling water shutoff device comprises:
The method according to claim 1,
And a shut-off valve for shutting off the cooling water inlet while the piston mechanism is operated to bring the cylinder into a negative pressure state.
The method according to claim 1,
And a shutoff valve for shutting off the cooling water inlet and the cooling water outlet at the same time when the piston mechanism is operated to make the cylinder into a negative pressure state.
The method of claim 1, wherein
The cylinder, the cooling water inlet, the cooling water inlet, the cooling water inlet, and the cooling water outlet are connected to a joint tunnel provided in the casing in a vertical direction,
And a shut-off valve for shutting down the cooling water inlet and the cooling water outlet at the same time when the piston mechanism is operated to make the cylinder into a negative pressure state;
Wherein the cooling water inlet and the cooling water outlet are opened or closed while being vertically operated by pneumatic pressure in a state of being fitted in the joint tunnel,
A first valve fitted in the joint tunnel and actuated like a piston; And a second valve linearly connected to the first valve by a first connecting rod.
KR1020140123534A 2014-09-17 2014-09-17 Apparatus For Shutting Off Cooling Water Of Welding Gun KR20160032873A (en)

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KR1020140123534A KR20160032873A (en) 2014-09-17 2014-09-17 Apparatus For Shutting Off Cooling Water Of Welding Gun

Applications Claiming Priority (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018124647A1 (en) * 2016-12-26 2018-07-05 (주)에이트론 Device for blocking cooling water of weld gun
CN111037081A (en) * 2020-01-13 2020-04-21 重庆特博液压机电有限公司 Welding gun cooling water treatment device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018124647A1 (en) * 2016-12-26 2018-07-05 (주)에이트론 Device for blocking cooling water of weld gun
CN110114183A (en) * 2016-12-26 2019-08-09 艾特伦有限公司 Welding gun cooling water baffling device
CN111037081A (en) * 2020-01-13 2020-04-21 重庆特博液压机电有限公司 Welding gun cooling water treatment device
CN111037081B (en) * 2020-01-13 2023-08-15 重庆特博智能装备有限公司 Welder cooling water processing apparatus

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