JP3443625B2 - Water-cooled cable fitting for plasma spray torch - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water cooling cable connector for supplying electric power and cooling water to the plasma spray torch. 2. Description of the Related Art A plasma spraying torch that melts and jets a material such as a metal for surface treatment by high-temperature plasma is basically composed of an anode cooled by water or the like, and an anode. A voltage is applied between the separate cathodes to generate an arc, the working gas supplied by the arc is turned into plasma, and a discharge port for sending a sprayed material is provided near the anode or the cathode. ,
The sprayed material is sprayed while being heated and melted by the plasma gas to perform a surface treatment.
The plasma spray torch must be supplied with electric power for generating an arc and cooling water for cooling between both electrodes, but generally, an electrode lead wire for supplying electric power is required. Is used in the water supply pipe. This water-cooled cable is also connected to the electrode control device, but naturally twists during use of the plasma spray torch. In order to respond to this twist, a conductive wire for an electrode in a water-cooled cable is formed by a knitted composite wire so that even if there is some twist, the knitted composite wire can absorb the twist. However, if the twisting of the braided composite line is repeated many times in the cooling water, the braided composite line changes and may be broken in some cases. Of course, for the water supply pipe outside the water cooling cable, no measures are taken to prevent twisting, so that the water supply pipe may be bent during use and supply of cooling water may not be performed smoothly. SUMMARY OF THE INVENTION [0004] The present invention has been made in view of the above situation, and the problems to be solved are as follows.
The purpose is to prevent twisting of the water-cooled cable for supplying power and cooling water. That is, first, the object of the present invention is to easily connect a water-cooled cable to a plasma spraying torch or a power supply control device, and to twist the water-cooled cable even if the plasma spraying torch is rotated and used. An object of the present invention is to provide a connecting device that does not cause a problem. In view of the above facts, the present inventor has made extensive studies and as a result, has made the water cooling cable 30 connected to both the plasma spray torch 10 and the power supply control device 200 rotatable. Thus, the above problem was solved by making the water-cooled cable connector 20 easy and safe to handle. That is, the feature of the present invention resides in a plasma spray torch 10 for generating a discharge between a water-cooled anode 11 and a cathode 12 to convert a sprayed material supplied from the outside into plasma and spray. A connector 20 for connecting a water-cooling cable 30 coaxially with an electrode conductor 31 connected to a power supply control device 200 and a water supply pipe 32, the conductive pipe 21 having the electrode conductor 31 connected to the outer end.
A metal fitting 22 fixed to an outer peripheral surface of the conductive pipe 21 to fix an end of a water supply pipe 32 in which the electrode conductor 31 is provided; and an inner end of the conductive pipe 21 to the anode 11 Terminal pipes 1 connected to the cathode 12
And a cap nut 23 rotatably abutting and supporting the outer end sides of the caps 3 and 14. The electrode conductor 31 is for conducting electricity from the electrode power supply device 200 to the anode 11 or the cathode 12 of the plasma spraying torch 10, and is composed of a braided composite wire. Connect to the outer end. The conductive pipe 21 has a hole 27 serving as a water channel above the connection part of the electrode lead wire 31, and cooling water supplied from the water supply pipe 32 passes through the conductive pipe 21 from the hole 27 and passes through the electrode terminal. An electrode provided at the tip of the plasma spray torch 10 is cooled through the pipe 13. The receiving metal fitting 22 for fixing the end of the water supply pipe 32 is provided coaxially on the inner end side of the conductive pipe 21.
An X-ring 24 having an X-shaped cross section is attached to at least two places on the contact surface of the receiving fitting 22 for fixing the end of the water supply pipe 32 with the fitting 1 for fixing the end of the water supply pipe 32. 22 is rotatable on the conductive pipe 21. Further, the inner end of the conductive pipe 21 of the receiving fitting 22 for fixing the end of the water supply pipe 32 is rotatably brought into contact with the outer ends of the terminal pipes 13 and 14 connected to the anode 11 and the cathode 12, respectively. And a cap nut 23 for supporting the same. The present invention is a connector 2 for connecting a water-cooled cable.
0, the water-cooled cable 30 is connected to the plasma spray torch 1
0 and a connection tool 2 for connecting a water-cooled cable even when a plasma spraying operation is performed with the power supply control device 200 connected.
With 0, the conductive pipe 21 is fixed to the anode pipe 11 of the plasma spraying torch 10 or the terminal pipes 13 and 14 of the cathode 12 by the cap nut 23, the electrode wire 31 is immobile, and only the water supply pipe 32 is left or right. Can also rotate. For this reason, since the electrode conducting wire 31 and the water supply pipe 32 are not twisted, the durability and the durability of the water-cooled cable 30 made of these can be increased without causing sagging or damage thereto. In addition, there is an advantage that it can be applied to an existing plasma spraying torch as it is. Another feature of the present invention corresponds to the tapered surfaces 13a and 14a formed on the outer end surfaces of the anode pipe 11 and the terminal pipes 13 and 14 of the water cooling cable 20 for the plasma spraying torch 10. That is, the tapered surface 21 a is formed at the inner end of the conductive pipe 21. In addition,
These tapered surfaces 13a, 14a or 21a may be implemented as spherical surfaces. That is, the anode 11 and the cathode 12 of the connector 20 of the water-cooled cable for the plasma spray torch 10
The tapered surface formed on the outer end surfaces of the terminal pipes 13 and 14 means that the anode 11 of the plasma spray torch 10 or the electrode 11 or
Terminal pipes 13 and 14 for connecting to the conductive pipe 21 of the electrode lead wire 31 for leading electricity to the cathode 12 are provided, and the terminal pipes 13 and 1 contacting the conductive pipe 21 are provided.
4, tapered surfaces 13a and 14a are formed on the outer end surface,
A tapered surface 21a is formed at the inner end of the conductive pipe 21 provided in the connector 20 of the water-cooled cable corresponding thereto, and the contact surface between the conductive pipe 21 and the electrode terminal pipes 13a and 14a is expanded to form a conductive pipe. This improves the performance and prevents leakage of cooling water. The tapered surfaces 13a, 13a, 1b are formed on both the outer end surfaces of the terminal pipes 13, 14 of the anode 11 or the cathode 12 of the plasma spraying torch 10 and the inner end surface of the conductive pipe 21 in contact therewith.
4a and 21a, the terminal pipes 13 and 1 are formed.
Since the conductive pipe 4 and the conductive pipe 21 are in surface contact, sufficient conduction can be ensured, and leakage of cooling water can be prevented. As shown in FIG. 1, a plasma spraying torch 10 includes a water supply pipe from a cold water circulation unit 400, a plasma gas hose, an electrode wire from a spraying power supply control device 200, and a powder supply device 300. Many hoses, such as powder feed hoses, are provided. As shown in FIG. 2, the plasma spray torch 10 has an anode 11 on the anode side and an electrode 12 on the cathode, which are covered with an insulator 15. From 17, the powder is melted and discharged.
The water cooling cable connector 20 of the present invention is provided behind the plasma spraying torch 10, a water supply pipe 32 for feeding cooling water from the cold water circulation unit 400, and a spray power supply control device 200.
It is a connecting tool for connecting the electrode lead wire 31 from above, or connecting to the anode 11 side terminal or the cathode 12 side terminal of the plasma spraying torch 10. A water supply pipe 32 and an electrode wire 31 are connected to the plasma spray torch 10 by using a water-cooled cable connector 20.
Is connected, the cooling water passes from the cold water circulation unit 400 to the space between the electrode conducting wire 31 and the water supply pipe 32, enters the terminal pipe 13 from the channel hole 27 provided in the terminal pipe 13 on the anode side, and enters the discharge port 17. And moves to the terminal pipe 14 side on the cathode side through a water channel provided around. Thereafter, from the channel hole 27 provided in the terminal pipe 14 on the cathode side,
After passing between the water supply pipe 32 and the electrode conductor 31, it returns to the cold water circulation unit 400. As shown in FIG. 3, the connector 20 for a water-cooled cable according to the present invention has a conductive pipe 21 to which an electrode conductor 31 is connected at the outer end, and an integral part of an outer peripheral surface of the conductive pipe 21. A metal fitting 22 for fixing an end of a water supply pipe 32 in which the electrode conductor 31 is provided; and terminal pipes 13 and 14 connecting the inner end of the conductive pipe 21 to the anode 11 and the cathode 12, respectively. And a cap nut 23 rotatably contacting and supporting the outer end side of the cap.
An X-ring 24 having an X-shaped cross section is attached to at least two places on the inner surfaces of the conductive pipe 21 and the receiving pipe 22, and the outer side of the receiving pipe 22 and above the conductive pipe 21. A fixing ring 26 for fixing the metal fitting 22 of the water supply pipe is fitted. Therefore, the water supply pipe 32 is fixed to the metal fitting 22 of the water supply pipe by the hose band 25, and inside the metal fitting 22 of the water supply pipe, the terminal pipe 13 of the anode of the plasma spray torch 10 at the tip of the conductor pipe 21, or There is a cap nut 23 which meshes with the pipe screw of the terminal pipe 14 of the cathode. The conductive pipe 21 is fixed to the respective terminal pipes of the anode 11 and the cathode 12 with the cap nut 23. 32 is rotatable by an X-ring 24 provided on the contact surface between the conductive pipe 21 of the electrode conductor and the receiving fitting 22 of the water supply pipe. Of course, the X-ring 24 may be a commonly used O-ring. The fixing ring 26 for fixing the fitting 22 of the water supply pipe to the upper part of the conductive pipe 21 may be any as long as it can fix the fitting of the water supply pipe rotatably. It may be something like
It is not limited to a fixing ring. Further, the X-ring 24 attached to the inner surface of the conductive pipe 21 for the electrode wire and the metal fitting 22 of the water supply pipe is such that the conductive pipe 21 for the electrode wire is fixed to the anode terminal pipe 13 or the cathode terminal pipe 14. If the water supply pipe 23 is rotatable at this time, it is not particularly limited to the X-ring, and for example, a spherical one such as an O-ring or a bearing may be used. Further, each of the connection sides of the anode terminal pipe 13 and the cathode terminal pipe 14 has a tapered surface 13.
The terminal pipes 13 and 14 are in surface contact with the conductive pipe 21 by providing the tapered surface 21a also at the inner end of the conductive pipe 21 in contact with the conductive pipe 21.
The tightening connection by the cap nut 23 is further strengthened, and sufficient conduction can be ensured, and also has an action of preventing water leakage. FIG. 4 shows a state in which the connector 20 of the water-cooled cable of the present invention is connected to both ends of the water-cooled cable 30. That is, a braided composite wire is used as the electrode conductor 31 for the connector 20 of the water-cooled cable, and this is connected to the electrode conductive pipe 21.
, And the water supply pipe 32 is connected to the fixing fitting 22 of the water supply pipe and is fixed by the hose band 25. As described above, by using the water-cooled cable connector for the plasma spraying torch of the present invention, the handling is easy, the braided composite wire of the electrode wire is less likely to be twisted, In addition, the twist resistance applied during hand-held spraying and robot-mounted spraying was significantly reduced. That is, the effect of the present invention is that a water-cooled cable can be easily connected to a plasma spray torch or a power supply control device, and a connection that does not cause twisting of the water-cooled cable even when the plasma spray torch is rotated and used. Can be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram of a plasma spraying apparatus. FIG. 2 is a cross-sectional view of a plasma spraying torch. FIG. 3 is a cross-sectional view of a water-cooled cable connector. 200: Thermal spray power supply controller 300: Powder supply device 400: Cold water circulation unit 10: Plasma spraying torch 11: Anode 12: Cathode 13: Anode terminal pipe 13a: Tapered surface 14 of anode terminal pipe: Cathode terminal pipe 14a: Cathode terminal pipe taper surface 15: Insulator 16: Handle 17: Discharge port 20: Water cooling cable connector 21 for plasma spray torch: Conductive pipe 21a: Conductive pipe taper surface 22: Water supply pipe Receiving fitting 23: cap nut 24: X-ring 25: hose band 26: water supply pipe receiving fitting fixing ring 27: water passage hole 30: Cold cable 31: electrode lead 32: Water pipe

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-36890 (JP, A) JP-A-4-356725 (JP, A) JP-A 1-138067 (JP, A) JP-A-57- 9218 (JP, A) JP-A-63-99715 (JP, A) JP-A-10-216950 (JP, A) JP-A 8-1-118029 (JP, A) JP-A-5-237665 (JP, A) 7-26067 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) C23C 4/00 B05B 7/22 H05H 1/34 H05H 1/42

Claims (1)

(57) [Claims 1] A plasma spraying torch for generating a discharge between a water-cooled anode and a cathode to convert a sprayed material supplied from the outside into plasma and spray. A connector for connecting a water-cooling cable having a coaxial electrode lead wire and a water supply pipe connected to a control device, a conductive pipe having the electrode lead wire connected to an outer end, and an outer peripheral surface of the conductive pipe. And a metal fitting for fixing the end of the water supply pipe in which the electrode conductor is provided, and turning the inner end of the conductive pipe toward the outer end of a terminal pipe connected to the anode and the cathode, respectively. A water cooling cable connector for a plasma spraying torch, comprising a cap nut movably abutting and supporting.