JPS62104682A - Cassette type plasma torch - Google Patents

Abstract

PURPOSE:To perform attachment and detachment of a head to the torch body simply and surely by composing the taper sealing part in conical shape and yet in plural pieces by the head having a root end part and by the body part having the tip part in the shape corresponding to the head root end part. CONSTITUTION:The three taper sealing parts 6, 7, 8 of a head 2 and the reverse taper sealing parts 6a, 7a, 8a of the body 1 are made to coincide with each other by fixing the both each other with a screw 3 by fitting the head 2 to the tip of the body 1. The chambers C1, C2 may be composed for feeding a cooling water and gas respectively by forming annular grooves 9a, 10b among the sealing parts. In this way the head of the torch can be attached and detached simply and surely.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a plasma torch used in a device for cutting metal members, and in particular to replacement of a torch head equipped with a plasma arc generating electrode and a plasma arc ejection hole. It relates to a technique that improves the means.

<Conventional technology> Conventional plasma torches have an integrated torch head and torch body, so if the electrodes inside the head become worn out, the entire torch consisting of the head and body must be completely disassembled. However, the disadvantage was that the electrodes had to be replaced, which was very time-consuming.

In order to improve this conventional drawback, for example, a technique as shown in Japanese Utility Model Publication No. EiO-5989 has recently been developed. However, this technology has many parts such as guide bins, electrical connection bins, reaction gas supply holes, cooling water supply holes, cooling completion water discharge holes, and connection bin insertion holes on the circumferential plane of the head and body. Because the head and body were connected through a seal such as an O-ring seal so that these items would match each other, it took time and effort to align and insert the O-ring, and the work efficiency was poor. Even after the torch and the podium were connected, gas and water sometimes leaked from the O-ring etc., which caused damage to the torch.

<Problems to be Solved by the Invention> The present invention fundamentally improves these conventional drawbacks. In particular, the head of the torch can be easily and securely attached to and detached from the body, and the gas of both It is an object of the present invention to provide a completely new cassette-type plasma torch that can automatically align a supply hole, a cooling water supply hole, a cooling water discharge hole, and a power transmission line with each other.

Means for Solving the Problems> The present invention provides a plasma torch with a head having a plasma arc nozzle, a tip, an electrode, a water channel, etc., a cooling water supply channel, a cooling water discharge channel, a reaction gas supply channel, a high frequency table, etc. The body is divided into two parts, and the base end of the head is formed into a conical shape, and three tapered seal parts and a ring groove are respectively formed around the cone. A cassette type characterized in that the tip of the body is formed into an inverted conical shape corresponding to the head, and an inverted tapered seal part and a ring groove corresponding to the head are formed on the inner peripheral surface of the cone, respectively. It's a plasma torch.

As described above, in the plasma torch according to the present invention, a plurality of circumferential annular chambers are formed at the joint between the head and the body of the torch, and these chambers are used as gas and water supply chambers. Since it is configured so that it can be used, there is no need for alignment at all when attaching the head to the torch body, and the seal between the body and head is performed with several wide tapered surfaces, so it is stable and reliable. Furthermore, since the electrical connection between the two is made at the contact surface of the tapered seal, a large contact surface area can be obtained, and the current can be reliably supplied.

<Embodiment> An embodiment of the torch according to the present invention will be specifically explained with reference to the drawings. In FIGS. 1 and 2, 1 is the body of the plasma torch, and 2 is the body 1. The head is removably attached.

The head 2 is attached to the body 1 via a cylindrical cassette screw 3. Reference numeral 4 denotes a set screw bored in the outer periphery of the tip of the body 1, and is configured so that the screw 3 can be hinged thereto. A plasma arc jet nozzle 5 is provided at the tip of the head 2, and its base is formed into a substantially conical shape with three tapered seals 6, 7, 8. There is a ring groove between 8 and 9.10.
is provided. On the other hand, the tip of the pod 1 is hollowed out into an inverted conical shape corresponding to the shape of the base of the head 2, and the inner circumferential wall thereof is provided with seals 6, 7.8 of the head 2. Seal portion 6a with a corresponding reverse taper
, 7a, 8a and ring grooves 9 corresponding to ring grooves 9, 10.
a, 10a are perforated. Therefore, when the head 2 is fitted into the body 1 and fixed with the screws 3, these seal portions 6.6a, 7, 7a, and 8.8a are completely brought into close contact with each other. Ring groove between 9.9
a, 2 independent chang/<-C according to 10.10a
I, C2.

Next, the head 2 includes a cap 11, a chip 12, and an electrode 13.
, a cassette insulator 14, a cassette metal 15, etc. are provided, and various water channels and gas channels including a central water channel 16 are bored between these.

Furthermore, inside the body l, a cooling water supply channel tea, a cooling water discharge channel 17, a reaction gas supply channel 18, a high frequency table 19, and an insulator 20 are arranged beautifully, and cooling water is supplied to the chamber C1. 02 are configured so that reaction gases can be supplied to each of them.

In addition, the plasma current, which is the main current, is conducted from the main body metal of the body l to the electrode 13 through the seal parts 6.6a, 7.7a, 8°8a and the cassette metal 15 of the head 2, while being insulated by the insulator 20.14. be done. On the other hand, the high frequency wave at the time of arc start is conducted from the high wave table 19 to the cap 11 and the chip 12 via the cassette screw 3 while being insulated by the insulator 20.14.

To explain the operation of the torch according to the present invention, as mentioned above, the plasma current is
a, 7.7a, 8.8a, electrode 1 from cassette metal 15
3, the high frequency is conducted from the high frequency table 19 to the chip 12 via the screw 3 and the cap 11, and the cooling water is conducted to the supply water channel 16. The central waterway 16 of the head 2 communicated with this
Exhaust channel 17 via various water channels and chamber C1 such as
The gas flows through the chip 12 through the reaction gas supply path 18, the chamber C2, and the passage 18a in the head 2.
It is configured so that it is released into the atmosphere from the tip.

Therefore, in the device according to the present invention, if the head 2 is fitted to the tip of the body l and both are fixed to each other with the screws 3, the sealing portion 6. 6a, 7.7a, 8°8a, and ring groove 9.9a
, 10.10a can be mutually matched, respectively,
As a result, the two chambers C1 and C2 to which cooling water and gas can be supplied, respectively, can be automatically configured in an airtight state, and the electrical connection between the body 1 and the head 2 can also be made with a tapered seal. Section 6.6a.

Stable current can be passed through the contact surfaces of 7.7a, 8, and 8a.

In the above embodiment, ring grooves 9.9a, 10, 10a were provided on both sides of the head and body 1, but one of these ring grooves 9.9a, 10.10a may be omitted and only one may be provided. It is also a round trip.

<Effects of the Invention> Since the device according to the present invention has the structure and operation described above, the head of the torch can be easily and reliably attached to and detached from the body with a single touch, and furthermore, the attachment and detachment requires special positioning. It has features such as being able to automatically match the relationships between cooling water, gas, and power transmission without having to do so.

[Brief explanation of drawings]

FIG. 1 is an explanatory cross-sectional view of a torch according to the present invention, and FIG. 2 is a side view of the body and head. 1 is the body, 2 is the head, 3 is the screw, 5 is the spout, 6,
6a, 7, 7a, 8, 8a are seal parts, 9.9a, +0
, 10a is a ring groove, 11 is a cap, 12 is a tip, 13 is an electrode, 18. lea is a waterway, 18 is a gas supply path, and CI and C2 are chambers. Patent applicant Koike Oxygen Industry Co., Ltd. Agent
Patent Attorney Medium Okayyoshi Figure 1 Figure 2

Claims (1)

[Claims] The plasma torch is divided into two parts: a head having a plasma arc outlet, a tip, an electrode, a water channel, etc., and a body having a cooling water supply channel, a cooling water discharge channel, a reaction gas supply channel, a high frequency table, etc.; The base end is formed into a conical shape, and a ring groove is formed as necessary between three tapered seals on the circumferential surface of the cone. A cassette type plasma torch characterized in that it is formed in a conical shape, and has an inverted tapered seal portion corresponding to the head on the inner circumferential surface of the cone, and a ring groove formed between the seal portions as necessary.