JP5853279B2 - Water stop device for spot welder - Google Patents

Description

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

  A spot welder is one that pressurizes and energizes the work between the upper electrode and the lower electrode, melts and welds the work with the electric resistance heat flowing through the work, and is widely used when welding the body of an automobile. It is used.

  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 the electrode from welding to the work due to this heat, as shown in FIG. 4, the electrode section 50 of the spot welder has an inner tube 52 facing the inside of the electrode 53, and a cylindrical shank 51. The cap chip type electrode 53 is cooled by the cooling water provided inside and supplied from the inner pipe 52. A water supply / drainage device 54 is attached to the proximal end of the shank 51, and cooling water is supplied from the cooling water inlet 54 a of the water supply / drainage device 54 to the inner pipe 52. It flows through the flow path 55 between the inner pipes 52 and is drained to the outside from the drainage outlet 54 b of the water supply / drainage device 54.

  On the other hand, the shape of the tip of the electrode 53 used in the spot welder is deformed due to the applied pressure or wear. If the electrode 53 is deformed, it may cause damage to the workpiece, poor welding, or spattering. For this reason, it is necessary to cut the electrode 53 with a tip dresser or the like to make the surface shape smooth every predetermined number of times of welding (for example, 1510 to 5100 times). However, since the number of electrodes 53 decreases each time cutting is performed, there is a limit to the number of times of cutting, and when cutting is performed a predetermined number of times, it is necessary to replace the electrode 53.

  When the electrode 53 is removed from the shank 51, water pressure is applied to the inner tube 52, so that cooling water is ejected from the tip of the inner tube 52. For this reason, when replacing the electrode 53, conventionally, the water stop valve as shown in Patent Document 1 is closed to stop the supply of cooling water.

JP 2002-349748 A

However, in the water stop valve as shown in Patent Document 1, even if the supply of the cooling water is stopped, the flow path of the cooling water and drainage to the position where the shank 51, the inner pipe 52, and the water stop valve are installed. Since a large amount of cooling water remains in the interior, when the electrode 53 is removed, a large amount of cooling water flows out of the shank 51 and the discharged cooling water spills on the floor of the factory. was there. For this reason, when replacing the electrode 53, it is necessary for an operator to place a bucket or the like under the shank 51 in advance to receive the cooling water, which is troublesome.
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 shank when the electrode is removed from the shank.

The invention according to claim 1, which has been made to solve the above problems,
An apparatus for stopping cooling water supplied to an electrode part of a spot welder,
A main body in which a rotating member storage portion that is a cylindrical space is formed,
A rotating member having a columnar shape disposed in the rotating member storage portion so as to be rotatable in a range from the first position to the third position;
The outer surface of the main body is formed with a cooling water inlet, a cooling water outlet, a drainage inlet, a drainage outlet, and a compressed air inlet that communicate with the rotating member storage unit.
In the state where the rotating member is in the first position, the rotating member is connected to the cooling water flow path connecting the cooling water inlet and the cooling water outlet, and the first connecting the drain inlet and the drain outlet. 1 drainage channel is formed,
Furthermore, the second drainage flow connecting the drainage inlet and the drainage outlet to the pivoting member in a state where the pivoting member is in a second position located between the first position and the third position. A first compressed air flow path connecting the compressed air inlet and the cooling water outlet is formed,
In the state where the rotating member is in the third position, the cooling water inlet and the compressed air inlet are closed by the rotating member, and on the other hand, a second compressed air flow path connecting the drain inlet and the compressed air outlet It is comprised so that may be formed .

The invention according to claim 2 is the invention according to claim 1 or 2,
The main body is formed with a lever insertion portion communicating with the rotating member storage portion,
A lever that is inserted through the lever insertion portion and protrudes from the main body is attached to the outer peripheral surface of the rotating member.

According to the first aspect of the present invention, when the rotating member is located at the second position, the cooling water inlet is blocked by the rotating member and stopped. The compressed air inlet and the cooling water outlet are connected by the first compressed air flow path, and the cooling water remaining in the electrode portion of the spot welder is discharged from the drain outlet by the compressed air .

When the rotating member is located at the third position, the drainage inlet and the compressed air outlet are connected by the second compressed air flow path, and a small amount of cooling water remaining in the shank is discharged from the compressed air outlet together with the compressed air. For this reason, when the electrode is removed from the shank, it is possible to further prevent the cooling water from flowing out of the shank.

According to the second aspect of the present invention, the main body is formed with a lever insertion portion communicating with the rotation member housing portion, and the outer peripheral surface of the rotation member is inserted into the lever insertion portion and protrudes from the main body. A lever is installed. Thereby, the operator can discharge the cooling water and waste water remaining in the shank and the pipe by a simple operation of rotating the lever. In addition, it is possible to provide a structure for rotating the rotating member with respect to the main body with a simple structure.

It is a figure showing the water stop apparatus of the spot welder which shows embodiment of this invention, (A) is a top view, (B) is a side view, (C) is a front view. It is AA sectional drawing of (A) of FIG. It is sectional drawing and the side view of the water stop apparatus of a spot welder. It is sectional drawing of the electrode part of a spot welding apparatus.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the present specification, water before cooling the electrode 53 of the spot welder is referred to as cooling water, and water after cooling the electrode 53 of the spot welder is referred to as drainage. As shown in FIGS. 1 and 2, the water stop device 10 of the spot welder of the present invention mainly includes a main body 1, a rotating member 2, a lever 3, a stopper member 4, four water pipe connecting members 5, It is comprised from the two air piping connection members 6. FIG.

  The main body 1 has a block shape. In the present embodiment, the main body 1 has a flat cylindrical shape. In the present embodiment, the main body 1 is mounted on a plate-like base 7. Inside the main body 1, there is formed a rotating member storage portion 1a which is a flat cylindrical cavity. The main body 1 has a two-part structure in the thickness direction. Two packing fitting grooves 1b are formed in parallel in the inner peripheral edge of the rotating member storage portion 1a of the main body 1 in parallel. A ring-shaped packing 8 is fitted and attached to the packing fitting groove 1b.

  As shown in FIGS. 1A and 1C, one side surface of the main body 1 is a water supply / drainage side surface 1c, and the other side surface of the main body 1 is an electrode portion side surface 1d. A cooling water inlet 1e and a drain outlet 1f communicating with the rotating member storage portion 1a are formed on the water supply / drainage side surface 1c. A cooling water outlet 1g and a drainage inlet 1h communicating with the rotating member storage portion 1a are formed on the electrode portion side surface 1d. As shown in FIGS. 1A and 1C, in the present embodiment, the cooling water inlet 1e and the drainage outlet 1g are opposed to each other with the rotating member storage portion 1a interposed therebetween. Further, the drain outlet 1f and the drain inlet 1h face each other with the rotating member storage portion 1a interposed therebetween. A water pipe connecting member 5 is connected to each of the cooling water inlet 1e, the drain outlet 1f, the drain outlet 1f, and the drain inlet 1h.

  A cooling water supply pipe (not shown) to which cooling water is supplied is connected to the cooling water inlet 1 e through a water pipe connecting member 5. A cooling water pipe (not shown) connected to the cooling water inlet 54a shown in FIG. 4 is connected to the cooling water outlet 1g via the water pipe connecting member 5. A drainage pipe (not shown) connected to the drainage outlet 54b shown in FIG. 4 is connected to the drainage inlet 1h. A drain pipe (not shown) is connected to the drain outlet 1 f via a water pipe connecting member 5.

  As shown in FIGS. 1A and 1C, a compressed air inlet 1i communicating with the rotating member storage portion 1a is formed on the water supply / drainage side surface 1c. In addition, a compressed air outlet 1j communicating with the rotating member storage portion 1a is formed on the electrode portion side surface 1d. An air pipe connecting member 6 is connected to each of the compressed air inlet 1i and the compressed air outlet 1j.

  A compressed air supply pipe (not shown) to which compressed air is supplied is connected to the compressed air inlet 1 i via an air pipe connecting member 6. An exhaust pipe (not shown) is connected to the compressed air outlet 1j through an air pipe connecting member 6.

  A packing fitting recess 1k is formed at the opening of the cooling water inlet 1e, the drainage inlet 1f, the cooling water outlet 1g, the drainage inlet 1h, the compressed air inlet 1i, and the compressed air outlet 1j to the rotating member storage 1a. Has been. A cylindrical packing 9 is fitted and attached to each packing fitting recess 1k.

  As shown in FIGS. 1A and 1B and FIG. 2, a lever insertion portion 1 m that communicates with the rotating member storage portion 1 a along the peripheral surface of the main body 1 is provided at the upper portion of the peripheral surface of the main body 1. Is formed. As shown in FIG. 2, the cross section of the lever insertion portion 1 m has a sector shape with a predetermined central angle. As shown in FIGS. 1 and 2, a stopper recess 1 n is formed in the upper end of the peripheral surface of the main body 1.

  As shown in FIG. 1 and FIG. 2, in the rotating member storage portion 1 a of the main body 1, a flat columnar rotating member 2 is rotatably accommodated and disposed. A lever 3 is attached to the outer peripheral surface of the rotating member 2. The lever 3 is inserted through the lever insertion portion 1m and protrudes outside the main body 1. A cylindrical stopper member 4 is slidably attached to the lever 3. The packings 8 and 9 attached to the main body 1 are in close contact with the rotating member 2.

  As shown in FIG. 3B, in a state where the lever 3 is in contact with one end surface of the lever insertion portion 1m, the lever 3 and the rotating member 2 are located at the first position. As shown in FIG. 3 (F), when the lever 3 is in contact with the other end surface of the lever insertion portion 1m, the lever 3 and the rotating member 2 are rotated by a predetermined angle from the first position. In the third position. Thus, the 1st position and 3rd position of the lever 3 and the rotation member 2 are positioned by the both end surfaces of the lever insertion part 1m. The lever 3 can be rotated within a range of a predetermined angle from the first position to the third position, thereby rotating the movable member 2 within a range of the predetermined angle from the first position to the third position. be able to. The intermediate position between the first position and the third position is the second position.

  As shown in FIG. 2, the end on the first position side of the stopper recess 1 n is smoothly connected to the outer peripheral surface of the main body 1. On the other hand, a locking wall 1p orthogonal to the bottom surface of the stopper recess 1n is formed at the end of the stopper recess 1n on the second position side. Therefore, when the lever 3 is rotated from the first position to the third position, the lower end of the stopper member 4 comes into contact with the locking wall 1p of the stopper recess 1n, and the lever 3 is positioned at the second position (FIG. 3 (D) state). To rotate the lever 3 to the third position in this state, the stopper member 4 is pulled upward, and the engagement between the stopper member 4 and the stopper recess 1n is released. The lever 3 in the third position can be rotated to the first position without being locked by the stopper recess 1n. In this embodiment, the stopper member 4 is moved to the stopper recess 1n side by its own weight, but the stopper member 4 is moved to the stopper recess 1n side by an urging member such as a spring. Even if it is a structure, it does not interfere.

  Next, the flow path formed in the rotating member 2 will be described with reference to FIG. 3, (A) and (B) show a state where the lever 3 and the rotating member 2 are in the first position, and (C) and (D) show that the lever 3 and the rotating member 2 are in the second position. (E) and (F) show a state in which the lever 3 and the rotating member 2 are in the third position. Further, the cross-sectional view shown in FIG. 3 is a view schematically showing a cross section of the water stop device 10 of the spot welder, and is different from a view showing an actual cross section.

As shown in FIG. 3A, the rotating member 2 includes a cooling water passage 2a that connects the cooling water inlet 1e and the cooling water outlet 1g in a state where the rotating member 2 is in the first position, and The 1st drainage flow path 2b which connects the drainage inlet 1h and the drainage outlet 1f is formed.
As shown in FIG. 3C, the rotating member 2 includes a second drainage channel 2c that connects the drainage inlet 1h and the drainage outlet 1f when the pivoting member 2 is in the second position, and A first compressed air flow path 2d that connects the compressed air inlet 1i and the cooling water outlet 1g is formed.
As shown in FIG. 3E, the rotating member 2 includes a second compressed air flow path 2e that connects the drainage inlet 1h and the compressed air outlet 1j when the rotating member 2 is in the third position. Is formed.

  When performing spot welding, the operator positions the lever 3 in the first position and positions the rotating member 2 in the first position. Then, as shown in FIG. 3A, the cooling water inlet 1e and the cooling water outlet 1g are connected by the cooling water channel 2a, and the drainage inlet 1h and the drainage outlet 1f are connected by the first drainage channel 2b. Is done. Thereby, cooling water is continuously supplied to the electrode part 50 of a spot welder.

  When replacing the electrode 53 (shown in FIG. 4), the operator first positions the lever 3 in the second position and positions the rotating member 2 in the second position. Then, as shown in FIG. 3C, the cooling water inlet 1e is closed by the rotating member 2, and the supply of cooling water to the electrode part 50 of the spot welder is shut off. The compressed air inlet 1i and the cooling water outlet 1g are connected by the first compressed air channel 2d, and the drainage inlet 1h and the drainage outlet 1f are connected by the second drainage channel 2c. Thereby, the cooling water remaining in the cooling water pipe and the electrode part 50 of the spot welder, and the waste water remaining in the electrode part 50 and the drain pipe of the spot welder are discharged from the drain outlet 1f by the compressed air. .

  Next, the operator places the lever 3 in the third position and places the rotating member 2 in the third position. Then, the compressed air inlet 1i is closed by the rotating member 2, and the supply of compressed air to the electrode unit 50 of the spot welder is shut off. Of course, the cooling water inlet 1 e is closed by the rotating member 2. Then, the drainage inlet 1h and the compressed air outlet 1j are connected by the second compressed air channel 2e, and a small amount of cooling water and wastewater remaining in the electrode part 50 of the spot welder are discharged from the compressed air outlet 1j together with the compressed air. . In this state, since the cooling water and drainage remaining in the electrode part 50, the cooling water pipe and the drain pipe of the spot welder are discharged, even if the electrode 53 is removed from the shank 51 (shown in FIG. 4). No cooling water or drainage flows out of the shank 51.

  Since the packings 8 and 9 that are in close contact with the surface of the rotating member 2 are attached to the main body 1, cooling water and compressed air do not leak from the water stop device 10 of the spot welder.

  Thus, in the present invention, the electrode of the spot welder can be obtained by a simple operation in which the operator rotates the lever 3 to the third position after rotating the lever 3 from the first position to the second position. It becomes possible to discharge the cooling water and waste water remaining in the section 50, the cooling water pipe, and the drain pipe.

  In addition, about the manual-type embodiment which rotates the rotation member 2 with a lever, although the water stop apparatus 10 of the spot welder of this invention was demonstrated, it is embodiment which rotates the rotation member 2 with an actuator. There is no problem.

DESCRIPTION OF SYMBOLS 1 Main body 1a Rotating member accommodating part 1b Packing fitting groove 1c Water supply / drainage side 1d Electrode side side 1e Cooling water inlet 1f Drainage outlet 1g Cooling water outlet 1h Drainage inlet 1i Compressed air inlet 1j Compressed air outlet 1k Packing fitting recess 1m Lever Insertion portion 1n Stopper recess 1p Locking wall 2 Rotating member 2a Cooling water flow path 2b First drainage flow path 2c Second drainage flow path 2d First compressed air flow path 2e Second compressed air flow path 3 Lever 4 Stopper member 5 Water Piping connecting member 6 Air piping connecting member 7 Base 8 Packing 9 Packing 10 Spot welder water stop device 50 Spot welder electrode 51 Shank 52 Inner pipe 53 Electrode 54 Water supply / drainage device 54a Cooling water inlet 54b Drainage outlet 55 Channel

Claims (2)

An apparatus for stopping cooling water supplied to an electrode part of a spot welder,
A main body in which a rotating member storage portion that is a cylindrical space is formed,
A rotating member having a columnar shape disposed in the rotating member storage portion so as to be rotatable in a range from the first position to the third position;
The outer surface of the main body is formed with a cooling water inlet, a cooling water outlet, a drainage inlet, a drainage outlet, and a compressed air inlet that communicate with the rotating member storage unit.
In the state where the rotating member is in the first position, the rotating member is connected to the cooling water flow path connecting the cooling water inlet and the cooling water outlet, and the first connecting the drain inlet and the drain outlet. 1 drainage channel is formed,
Furthermore, the second drainage flow connecting the drainage inlet and the drainage outlet to the pivoting member in a state where the pivoting member is in a second position located between the first position and the third position. A first compressed air flow path connecting the compressed air inlet and the cooling water outlet is formed,
In the state where the rotating member is in the third position, the cooling water inlet and the compressed air inlet are closed by the rotating member, and on the other hand, a second compressed air flow path connecting the drain inlet and the compressed air outlet A water stop device for a spot welder, wherein the water stop device is formed. The main body is formed with a lever insertion portion communicating with the rotating member storage portion,
2. The water stop device for a spot welder according to claim 1, wherein a lever that passes through the lever insertion portion and protrudes from the main body is attached to an outer peripheral surface of the rotating member.

Images