JP3160682U - Water stop device for spot welder - Google Patents

Abstract

A water stop device for a spot welder capable of preventing cooling water from flowing out of an electrode holder when an electrode is removed. An apparatus powder includes a water absorption valve member, a drain valve member, and an actuator. In the apparatus main body 1, a water-absorbing valve member insertion portion 1c and a drain valve member insertion portion 1d, which are cylindrical spaces and open to the outer surface, are formed in parallel. A cooling water flow passage that communicates with the inner peripheral surface and the bottom of the drainage valve and a drainage flow passage that communicates with the inner peripheral surface and the bottom of the drain valve insertion hole 1d from the outer surface at different positions, respectively. The water absorption valve member 3 is slidably disposed in the water absorption valve member insertion portion 1c, and the drainage valve member 4 is slidably disposed in the drainage valve insertion hole 1d. The actuator 2 slides the water absorption valve member 3 and the drain valve member 4 simultaneously. [Selection] Figure 1

Description

  The present invention relates to a water stop device for a spot welder that stops the flow of cooling water for cooling the electrode when the electrode of the spot welder is replaced.

  Conventionally, an electric resistance spot welder is one that pressurizes and energizes a work between an upper electrode and a lower electrode, melts and welds the work with electric resistance heat flowing through the work, and welds the body of an automobile. Widely used when you want.

  In this electric resistance spot welding, since the workpiece is welded by electric resistance heat caused by a current flowing between the electrodes, the electrodes are always exposed to heat. In order to prevent welding of the electrode to the workpiece due to this heat, as shown in FIG. 5, an inner tube 51 facing the inside of the electrode 52 is provided in the electrode holder 50, and cooling supplied from the inner tube 51 is performed. The cap chip type electrode 52 is cooled with water. The drainage that has cooled the electrode 52 is drained through the inside of the electrode holder 50 and outside of the inner tube 51, that is, through the flow path 55 between the electrode holder 50 and the inner tube 51. .

  On the other hand, the shape of the tip of an electrode used in an electric resistance spot welder is deformed due to applied pressure or wear. If the electrode 52 is deformed, it may cause damage to the workpiece, poor welding, or spattering. For this reason, it is necessary to cut the electrode 52 with a tip dresser or the like to make the surface shape smooth every predetermined number of times of welding (for example, 1500 to 5000 times). However, since the electrode 52 decreases each time cutting is performed, the number of times of cutting is limited, and the electrode 52 needs to be replaced when it is cut a predetermined number of times.

  When the electrode 52 is removed from the electrode holder 50, water pressure is applied to the inner tube 51, and thus cooling water is ejected from the tip of the inner tube 51. For this reason, when exchanging the electrode 52, conventionally, an operator closed the water stop valve as shown in Patent Document 1 to stop the supply of cooling water. In general, such a water stop valve is often installed at a location away from the electrode 52 to be replaced, and there is a problem that workability is poor. Even if the supply of cooling water is stopped, a large amount of cooling water remains in the cooling water and drainage flow paths to the electrode holder 50, the inner pipe 51, and the position where the water stop valve is installed. Therefore, when the electrode 52 is removed, a large amount of cooling water flows out from the electrode holder 50, and the outflowing cooling water spills on the floor of the factory. For this reason, when replacing the electrode 52, it is necessary for an operator to place a bucket or the like under the electrode holder 50 in advance to receive the cooling water, which is troublesome.

  Therefore, a spot welding electrode as shown in Patent Document 2 is shown. The spot welding electrode is composed of an electrode, an electrode holder that attaches an electrode to the tip, and supplies cooling water to the electrode, and a rotating ring that is rotatably disposed on the outer periphery of the electrode holder. On the outer peripheral surface of the electrode holder, there are formed a supply port for supplying cooling water and a discharge port for discharging waste water after cooling the electrode. When the rotating ring is rotated by a predetermined angle, the supply port and the discharge port are opened and closed. As described above, in the spot welding electrode shown in Patent Document 2, since the rotating ring for opening and closing the supply port and the discharge port is rotatably disposed in the electrode holder, the circulation of the cooling water is blocked in the vicinity of the electrode. Thus, not only the workability becomes very good, but also the amount of cooling water and drainage discharged when the electrodes are removed can be reduced.

JP 2002-349748 A Japanese Utility Model Publication No. 1-135181

However, since the cooling water and waste water remaining in the electrode holder still flow out, it is necessary to wipe off the cooling water that the operator has flowed out.
An object of the present invention is to solve the above-mentioned problems and to provide a water stop device for a spot welder capable of preventing the cooling water from flowing out of the electrode holder when the electrode is removed.

The device according to claim 1, which has been made to solve the above problems,
It is a cylindrical space, and the water absorption valve member insertion part and the drainage valve member insertion part that open to the outer surface are formed in parallel, and communicate with the inner peripheral surface and the bottom of the water absorption valve member insertion part from the outer surface at different positions, respectively. A cooling water flow passage, and an apparatus main body formed with a drain flow passage communicating with the inner peripheral surface and the bottom of the drain valve insertion hole from the outer surface at different positions, respectively.
A water absorption valve member slidably inserted into the water absorption valve member insertion portion;
A drain valve member slidably inserted into the drain valve member insertion portion;
An actuator for simultaneously sliding the water absorption valve member and the drain valve member;
It is characterized by having.

The device according to claim 2 is the device according to claim 1,
O-ring grooves are formed in the outer peripheral surfaces of the water absorption valve member and the drain valve member over the entire circumference.
An O-ring is attached to the O-ring groove.
This makes it possible to prevent leakage of cooling water from the boundary between the water absorption valve member, the drain valve member, the water absorption valve member insertion portion, and the drain valve insertion hole.

The device according to claim 3 is the device according to claim 1 or 2,
A water stop surface that is a conical space is formed in communication with the bottom of the water absorption valve member insertion portion and the drain valve insertion hole,
A water stop portion having a shape corresponding to the water stop surface is formed at the tips of the water absorption valve member and the drain valve member.
Thereby, when a water stop part corresponds to a water stop surface, a cooling water flow path and a drainage flow path are completely obstruct | occluded, and it becomes possible to interrupt | block the distribution | circulation of a cooling water and waste water reliably.

The device according to claim 4 is the device according to claim 3,
An O-ring groove is formed in the water stop portion of the water absorption valve member and the drain valve member over the entire circumference.
An O-ring is attached to the O-ring groove.
Thereby, the airtightness of the boundary between the water stop portion and the water stop surface is maintained, the action of atmospheric pressure on the boundary is prevented, and the atmospheric pressure is applied only from the tip of the electrode holder. Thus, it is possible to reliably prevent the cooling water remaining in the tank from flowing out.

  According to the present invention, a water-absorbing valve member insertion portion and a drainage valve member insertion portion, which are cylindrical spaces and open to the outer surface, are formed in parallel, and each of the water-absorbing valve member insertion portions from the outer surface at different positions, respectively. A cooling water flow passage communicating with the peripheral surface and the bottom portion, an apparatus main body in which a drain flow passage communicating with the inner peripheral surface and the bottom portion of the drain valve insertion hole from the outer surface at different positions, respectively, and the water absorption valve member insertion portion are formed. A water-absorbing valve member inserted slidably, a drain valve member slidably inserted into the drain valve member insertion portion, and an actuator for simultaneously sliding the water-absorbing valve member and the drain valve member. As a result, when the actuator is operated in the closing direction, not only the cooling water flow passage but also the drainage flow passage is closed at the same time, so the supply of cooling water to the electrode holder is shut off and the water flow is stopped. It is possible to prevent leakage of the cooling water and drainage remaining in the electrode, and to prevent the cooling water from flowing out from the electrode holder when the electrode is removed.

It is a front view of the water stop apparatus of a spot welder. It is AA sectional drawing of FIG. It is a front view of the water stop apparatus of a spot welder. It is a conceptual diagram at the time of using the water stop apparatus of a spot welder for C gun. It is explanatory drawing of an electrode and an electrode holder.

(Structure of water stop device for spot welder)
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, the water stop device 20 of the spot welder of the present invention (hereinafter simply referred to as the water stop device 20) includes a device main body 1, an actuator 2, a water absorption valve member 3, and a drain valve member. 4, an O-ring 5, an O-ring 6, a water absorption side inlet jack 7, a water absorption side outlet jack 8, a drainage side outlet jack 9, and a drainage side inlet jack 10 (shown in FIG. 3). For convenience, FIG. 1 shows a state where the water intake side inlet jack 7 and the drain side inlet jack 10 are removed, and FIG. 3 shows a state where the water side inlet jack 7 and the drain side inlet jack 10 are attached. Yes.

  In FIGS. 1 and 2, the upper side of the paper is the upper side of the water stop device 20. Further, in FIGS. 1 and 3, the horizontal direction of the drawing is the width direction of the water stop device 20. In the embodiment shown in the figure, the apparatus main body 1 is composed of a block-shaped water circulation part 1a and a plate-like attachment part 1b protruding upward from the upper end of the water circulation part 1a. The water circulation portion 1a is formed with a water absorption valve member insertion portion 1c and a drainage valve member insertion portion 1d that open to the upper end surface of the water circulation portion 1a. The water absorption valve member insertion portion 1c and the drainage valve member insertion portion 1d are cylindrical spaces. A water stop surface 1e and a water stop surface 1f, which are conical spaces, are formed in communication with each bottom of the water absorption valve member insertion portion 1c and the drain valve member insertion portion 1d. A water absorption side outlet hole 1g that opens to the lower end surface of the water circulation portion 1a is formed in communication with the bottom of the water stop surface 1e. On the inner peripheral surface of the water absorption side outlet hole 1g, a screw groove is screwed and a water absorption side outlet jack 8 is attached. A drain side outlet hole 1h that opens to the lower end surface of the water circulation portion 1a is formed in communication with the bottom of the water stop surface 1f. On the inner peripheral surface of the drain side outlet hole 1h, a thread groove is threaded and a drain side outlet jack 9 is attached.

  The water circulation portion 1a is formed with a water absorption side inlet hole 1i that communicates with the inner peripheral surface of the water absorption valve member insertion portion 1c and opens to the outer surface of the water circulation portion 1a. A screw groove is screwed into the opening of the water absorption side position hole 1i, and the water absorption side inlet jack 7 is attached. The water circulation portion 1a is formed with a drain side inlet hole 1j that communicates with the inner peripheral surface of the drain valve member insertion portion 1d and opens to the outer surface of the water circulation portion 1a. The drain side inlet hole 1j is screwed with a screw groove, and a drain side inlet jack 10 is attached. With such a structure, a cooling water flow passage is formed between the water absorption side inlet jack 7 and the water absorption side outlet jack 8. Further, a drainage flow passage is formed between the drainage side inlet jack 10 and the drainage side outlet jack 9.

  The water absorption valve member 3 and the drain valve member 4 are substantially cylindrical. Conical water-stopping portions 3a and 4a are formed at the tips of the water-absorbing valve member 3 and the drainage valve member 4 in correspondence with the shapes of the water-stopping surfaces 1e and 1f, respectively. On the outer peripheral surfaces of the water absorption valve member 3 and the drain valve member 4, O-ring grooves 3b and 4b are formed to be recessed over the entire circumference. O-rings 5 are attached to the O-ring grooves 3b and 4b, respectively. In addition, O-ring grooves 3c and 4c are formed on the outer peripheral surfaces of the water stop portions 3a and 4a over the entire circumference. O-rings 6 are attached to the O-ring grooves 3c and 4c, respectively. The water absorption valve member 3 and the drainage valve member 4 are slidably inserted into and attached to the water absorption valve member insertion portion 1c and the drainage valve member insertion portion 1d, respectively.

  An actuator 2 is attached to the attachment portion 1 b of the apparatus main body 1. The actuator 2 includes an air cylinder that operates with compressed air, a hydraulic cylinder that operates with hydraulic pressure, and an electric actuator that operates with electricity. The actuator 2 has a sliding shaft 2a that slides in the direction of the opening of the water absorption valve member insertion portion 1c and the drain valve member insertion portion 1d. The sliding shaft 2a is arranged in parallel. When the actuator 2 operates, the two sliding shafts 2a slide at the same time. The actuator 2 is provided with a position sensor 2c that detects the position of the sliding shaft 2a. The connecting member 2b is attached to the tip of the two sliding shafts 2a, and the two sliding members 2a are connected by the connecting member 2b. A water absorption valve member 3 and a drain valve member 4 are attached to the connecting member 2b. For this reason, when the actuator 2 is slid, the water absorption valve member 3 and the drain valve member 4 are simultaneously slid in the water absorption valve member insertion portion 1c and the drain valve member insertion portion 1d. As shown in FIG. 2, an O-ring 5 is attached to the water absorption valve member 3 and the drainage valve member 4, and the O-ring 5 is connected to the inner peripheral surfaces of the water absorption valve member insertion portion 1c and the drainage valve member insertion portion 1d. Even if water pressure acts on the water absorption valve member insertion portion 1c and the drainage valve member insertion portion 1d, the water may leak from the openings of the water absorption valve member insertion portion 1c and the drainage valve member insertion portion 1d. No.

  As shown in FIG. 2A, in a state where the sliding shaft 2a slides in a direction (closed position direction) close to the opening side of the water absorption valve member insertion portion 1c and the drainage valve member insertion portion 1d, Water stop portions 3a and 4a formed at the tips of the water absorption valve member 3 and the drain valve member 4 are pressed against the water stop surfaces 1e and 1f. In this state, the cooling water flow passage formed between the water absorption side inlet jack 7 and the water absorption side outlet jack 8 is closed by the water absorption valve member 3. Since the O-ring 6 is attached to the water-stop portion 3a of the water-absorbing valve member 3, and the O-ring 6 is pressed against the water-stop surface 1e, even if water pressure acts on the water-stop surface 1e, the water-absorption-side outlet jack 8 side There is no leakage of water. Further, in the state shown in FIG. 2A, the drainage valve member 4 blocks the drainage flow passage formed between the drainage side inlet jack 10 and the drainage side outlet jack 9. Since the O-ring 6 is attached to the water stop portion 4a of the drain valve member 4 and the O-ring 6 is pressed against the water stop surface 1f, even if water pressure acts on the water stop surface 1f, the drain side outlet jack 9 side There is no leakage of water.

  As shown in FIG. 2B, when the sliding shaft 2a slides in the direction away from the openings of the water absorption valve member insertion portion 1c and the drainage valve member insertion portion 1d (open position direction), the water absorption valve The water stop portions 3a and 4a formed at the tips of the member 3 and the drain valve member 4 are separated from the water stop surfaces 1e and 1f. In this state, the cooling water flow passage formed between the water absorption side inlet jack 7 and the water absorption side outlet jack 8 is opened. In this state, the cooling water flows from the water absorption side inlet jack 7 to the water absorption side outlet jack 8, and the cooling water is supplied to the electrodes of the spot welder. Further, in the state shown in FIG. 2B, the drainage flow passage formed between the drainage side inlet jack 10 and the drainage side outlet jack 9 is opened and drained from the drainage side inlet jack 10 to the drainage side outlet jack 9. Circulates and drains water after cooling the electrodes of the spot welder.

(Explanatory drawing of the installation state of the water stop device of the spot welder)
Below, the use condition of the water stop apparatus 20 of this invention is demonstrated using FIG. FIG. 4 shows a state in which the water intake side inlet jack 7 and the drain side inlet jack 10 are removed for convenience. The C gun 30 as shown in FIG. 4 is a spot welder used by being attached to an industrial robot. The C gun 30 mainly includes a substantially C-shaped yoke 30a, a gun arm 30b disposed at the base end of the yoke 30a, and a gun transformer 30f disposed at the base end side of the yoke 30a. ing. A shank 30c is attached to the tip of the yoke 30a. An electrode 51 is attached to the tip of the shank 30c. A shank 30d is attached to the tip of the gun arm 30b. An electrode 51 is attached to the tip of the shank 30d. The electrode 51 attached to the tip of the shank 30c is opposed to the electrode 51 attached to the tip of the shank 30d. The gun arm 30b is moved in the axial direction by the servo 30e, and the electrode 51 attached to the tip of the shank 30c and the electrode 51 attached to the tip of the shank 30d are in contact with each other.

  Below, the distribution route of the cooling water and drainage of C gun 30 is explained. As shown in FIG. 4, an inlet 30j is formed at the base end of the yoke 30a. A flow path 30k is formed from the inflow port 30j to the electrode 51 attached to the tip of the shank 30c. An outlet 30m is formed at the base end of the yoke 30a. A flow path 30n is formed from the outlet 30m to the electrode 51 attached to the tip of the shank 30c. An inflow port 30s is formed at the base end of the gun arm 30b. A flow path 30t is formed from the inflow port 30s to the electrode 51 attached to the tip of the shank 30d. An outlet 30p is formed at the base end of the gun arm 30b. A flow path 30q is formed from the outlet 30p to the electrode 51 attached to the tip of the shank 30d.

  As shown in FIG. 4, two water stop devices 20 are used for the C gun 30. The water absorption side outlet jack 8 of one water stop device 20 is connected to the inflow port 30s. The drain side inlet jack 10 of one water stop device 20 is connected to the outlet 30p. The water absorption side outlet jack 8 of the other water stop device 20 is connected to the inflow port 30j. The drain side inlet jack 10 of the other water stop device 20 is connected to the outlet 30m. The water intake side inlet jack 7 of each water stop device 20 is connected to the cooling water supply pipe 91. Further, the drain side outlet jack 9 of each water stop device 20 is connected to the drain pipe 92.

  In the case of welding with the C gun 30, the actuator 2 is operated to slide the sliding shaft 2a in the open position direction as shown in FIG. The cooling water flow path formed between the outlet jacks 8 and the drainage flow path formed between the drain side inlet jack 10 and the drain side outlet jack 9 are opened. Then, the cooling water supplied from the cooling water supply pipe 91 to the water inlet side inlet jack 7 flows into the inlets 30 s and 30 j from the water inlet side outlet jack 8, and the cooling water is supplied to the electrode 51. Cooled continuously. Then, the waste water after cooling the electrode 51 flows into the drain side inlet jack 10 from the outlets 30p and 30m, and is continuously discharged from the drain side outlet jack 9 to the drain pipe 92. In this embodiment, the welding current is supplied to the shanks 30c and 30d only when the position sensor 2c detects that the sliding shaft 2a is in the open position direction. On the other hand, when the position sensor 2c does not detect that the sliding shaft 2a is in the open position direction, the welding current is not supplied to the shanks 30c and 30d. Thereby, welding of the electrode 51 is prevented.

  On the other hand, when replacing the electrode 51 attached to the C gun 30, the actuator 2 is operated to slide the sliding shaft 2a in the closed position direction as shown in FIG. Thus, the flow path formed between the water intake side inlet jack 7 and the water intake side outlet jack 8 and the cooling water flow passage formed between the drain side inlet jack 10 and the drain side outlet jack 9 are closed. Then, the cooling water supplied from the cooling water supply pipe 91 to the water absorption side inlet jack 7 is blocked by the water absorption valve member 3, and the cooling water is not supplied to the electrode 51. For this reason, even if the electrode 51 is removed, the cooling water is not ejected. In the present invention, when the actuator 2 is operated to slide the sliding shaft 2a in the closed position direction, the drainage flow passage formed between the drainage side inlet jack 10 and the drainage side outlet jack 9 is also closed. Therefore, the waste water remaining in the flow paths 30t and 30n and the drain pipe 92 is not leaked. In this embodiment, since the O-ring 6 is attached to the water absorption valve member 3 and the drainage valve member 4, the flow path formed between the water absorption side inlet jack 7 and the water absorption side outlet jack 8 is closed. Then, since the O-ring 6 is pressed against the water stop surfaces 1g and 1f, the airtightness between the water stop portions 3a and 4a and the water stop surfaces 1g and 1f is maintained, and the flow paths 30k, 30n, 30q, 30t, The cooling water remaining in the cooling water supply pipe 91 and the drain pipe 91 does not leak out. This is because the atmospheric pressure acts only from the tips of the shanks 30c, 30d, and the atmospheric pressure does not act on the boundary between the water stop portions 3a, 4a and the water stop surfaces 1g, 1f. In addition, interfacial tension due to the intermolecular force of the cooling water is generated at the boundary surface between the cooling water and the atmosphere in the shanks 30c and 30db, and the passage of air from the boundary surface is prevented. It is considered that the leakage of the cooling water remaining in 30k, 30n, 30q, 30t, the cooling water supply pipe 91, and the drain pipe 91 is prevented.

  As shown in FIG. 4, the embodiment in which the water stop device for the spot welder of the present invention is attached to the C gun 30 has been described. However, the water stop device for the spot welder of the present invention is not limited to this. Needless to say, it can also be used for a so-called X gun or a spot welder having an electrode attached to the tip and a shank opposed to be separable.

  Although the present invention has been described above in relation to the most practical and preferred embodiments at the present time, the present invention is not limited to the embodiments disclosed herein. However, the invention can be changed as appropriate without departing from the scope or spirit of the invention that can be read from the claims of the utility model registration and the entire specification, and such a change also includes a water stop device for a spot welder in the technical scope. Must be understood as being.

DESCRIPTION OF SYMBOLS 1 Apparatus main body 1a Water distribution part 1b Mounting part 1c Water absorption valve member insertion part 1d Drainage valve member insertion part 1e Water stop surface 1f Water stop surface 1g Water absorption side outlet hole 1h Drain side outlet hole 1i Water absorption side inlet hole 1j Drain side inlet hole 2 Actuator 2a Slide shaft 2b Connecting member 2c Position sensor 3 Water absorption valve member 3a Water stop part 3b O ring groove 3c O ring groove 4 Drain valve member 4a Water stop part 4b O ring groove 4c O ring groove 5 O ring 6 O ring 7 Water absorption Side inlet jack 8 Water intake side outlet jack 9 Drain side outlet jack 10 Drain side inlet jack 10 Water stop device for spot welder 30 C Gun 30a Yoke 30b Gun arm 30c Shank 30d Shank 30e Servo 30f Gun transformer 30g Supply pipe 30h Drain pipe 30j Flow Inlet 30k Flow path 30m Outlet 3 0p Outlet 30q Channel 30s Inlet 30t Channel 50 Electrode holder 51 Inner tube 52 Electrode 53 Water supply / drainage device 53a Water supply port 53b Drainage port 55 Channel 91 Cooling water supply tube 92 Drainage tube

Claims (4)

It is a cylindrical space, and the water absorption valve member insertion part and the drainage valve member insertion part that open to the outer surface are formed in parallel, and communicate with the inner peripheral surface and the bottom of the water absorption valve member insertion part from the outer surface at different positions, respectively. A cooling water flow passage, and an apparatus main body formed with a drain flow passage communicating with the inner peripheral surface and the bottom of the drain valve insertion hole from the outer surface at different positions, respectively.
A water absorption valve member slidably inserted into the water absorption valve member insertion portion;
A drain valve member slidably inserted into the drain valve member insertion portion;
An actuator for simultaneously sliding the water absorption valve member and the drain valve member;
A water stop device for a spot welder, characterized by comprising: O-ring grooves are formed in the outer peripheral surfaces of the water absorption valve member and the drain valve member over the entire circumference.
The water stop device for a spot welder according to claim 1, wherein an O-ring is attached to the O-ring groove. A water stop surface that is a conical space is formed in communication with the bottom of the water absorption valve member insertion portion and the drain valve insertion hole,
The water stop device for a spot welder according to claim 1 or 2, wherein a water stop portion having a shape corresponding to the water stop surface is formed at the tips of the water absorption valve member and the drain valve member. . An O-ring groove is formed in the water stop portion of the water absorption valve member and the drain valve member over the entire circumference.
The water stop device for a spot welder according to claim 3, wherein an O-ring is attached to the O-ring groove.