JPH03502074A - plasma generator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] plasma generator Technical field TECHNICAL FIELD The present invention relates generally to metal processing using plasma arcs, and in particular to metal cutting, melting, etc. Concerning plasma generators used for bonding, spraying, and surface hardening treatments. do.

Background technology Integral with housing, cathode, and nozzle configuration with elements for acceleration Equipped with a head bead in the form of a molded unit to heat and cut metal. , plasma generators for welding are known (see PL, B, 105.285). (see). This plasma generator has a housing and a chamber to circulate the coolant. a passageway extending through the headpiece. Plasma generator housing Multiple connecting lines are used to supply refrigerant to the housing and to discharge refrigerant from the housing. provided and these contact lines substantially connect these communication lines to the housing. It has a mechanical valve at the point. These valves can be used for repair e.g. When the plasma generator is removed from the contact line, it is closed. Ru.

When some kind of failure occurs in this conventional plasma generator, this The Zuma generator must be removed from the contact line. After that, the defective part is replaced and the plasma generator is reassembled and connected to the contact line. It will be done. This known plasma generator is complex and inconvenient to maintain; Repairs take a long time, and slow-response mechanical valves can disrupt contact lines. This makes it easy for refrigerant to leak.

Additionally, it supplies refrigerant to the housing and releases refrigerant from the housing. a removable and separable headpiece having a passageway for A passageway connects around the separation line and provides cooling when the headpiece is removed. A plasma generator is known that also includes a means for cutting off the supply of the medium (S (See U, A, 105.285). The means to cut off the supply of this refrigerant is The shape of the valve located at the end of the connection line that is connected to the plasma generator and carries the refrigerant to the plasma generator. have.

This valve is used, for example, when the plasma generator is removed for repair. Acts to close the line of communication.

Although the above device is somewhat convenient (replaceable headpiece), it The refrigerant remaining in the headpiece may leak onto the surface of the workpiece to be processed, or the headpiece may Operator's hands get wet when removed during work.

This causes defects on the surface of the workpiece being machined, and also causes The use of antifreeze as a medium is not sufficiently safe.

Summary of the invention The purpose of the invention is to prevent refrigerant from flowing out when the headpiece is removed. a plug having means for shutting off the supply of refrigerant to the passageway, configured to An object of the present invention is to provide a Zuma generator.

The above object of the invention is to provide a plurality of passages for supplying and discharging refrigerant - these passages. comprises separable headpieces having - connected to each other along a separation line. When separating the housing and headpiece, cut off the supply of refrigerant to the passage. In the plasma generating apparatus, the supply of the refrigerant to the passage is interrupted. used as a cutting means equal to the number of passages in said housing. Solenoid-driven valve with a movable element in the form of a rod with a number of through holes , these holes have a cross-sectional area corresponding to the cross-sectional area of the passage, and the above rod is , in one of its extreme positions, the coil supply circuit of the solenoid-driven valve is When the rod is closed, the hole in the rod is coaxial with the passage, and the other end of the rod is in the same position as the passage. In this case, the coil supply circuit of the solenoid-driven valve is open and the rod hole is locked. the housing so that it is offset from the passageway in the housing and closes the passageway hole. It is possible to move inside the housing, and the housing has multiple contact plates, each at one end of the coil supply circuit of the solenoid-driven valve. connected to a closed current transmission element mounted on a separable headpiece. They are characterized by being attached so that they interlock.

The main advantage of the plasma generator proposed here is the possibility of replacing faulty elements. This prevents refrigerant leaks when replacing or removing the head bead. This thing is , the quality of the workpiece being machined by automated plasma arc machining. Even in cases where Another advantage is the high level of safety in the manufacturing process. integrity and refrigerant savings. This is especially important when using expensive substances as refrigerants. This is particularly important.

Brief description of the drawing The invention will be described in more detail with respect to specific embodiments and with the help of the associated drawings.

among them, FIG. 1 is a longitudinal partial cross-sectional view of a plasma generation device according to the present invention, and FIG. 2 is a cross section taken along line -H at the first leap.

BEST MODE FOR CARRYING OUT THE INVENTION Referring to FIGS. 1 and 2, the plasma generator according to the present invention has a bottom portion A housing 1 assembled from dielectric material and a threaded connection 3 A separable head piece 2 is connected to a housing 1 by means of a separable head piece.

The proposed plasma generator also removes the coolant when removing the head piece 2. means for cutting off the supply, the means comprising an electromagnetic coil whose winding is connected to the direct current source 11; A solenoid with a movable element in the form of a rod 9 serving as the core of the coil 10. It has the shape of a driven valve 8.

The rod 9 extends through the housing 1 through a passage 4'J6 formed within the housing 1. and 5 axes. Connected to the end of rod 9 is a return spring. 12, and the rod is moved to the leftmost position once the headpiece 2 is removed. provided for setting. The rods 9 are equal to the number of closed passages 4.5 (wherein in the described embodiment the rod 9 has a different number of through holes 13). It has two through holes 13 as described above). The cross section of the hole 13 is the cross section of the passages 4 and 5. It corresponds to the surface. Furthermore, the rod 9 is equipped with a stop element that limits its movement. It has biti4 which operates as a host. When rod 9 moves to the rightmost position , the collar 14 bears against the wall 15 of the housing of the valve 8. As a result, hole 13 is aligned with passage 4.5 (this position is shown in FIG. 1).

A contact plate 16,17 made of a conductor is attached to the housing 1 of the plasma generator. It's built in. Plate 16 is electrically connected to one end of coil 10 by a conductor 18. It is continued. Another conductor 19 connects the plate 17 to the terminal "-" of the current source 11. ing. On the other hand, the terminal "+" connects the current source 11 to the valve 8 through the conductor 20. 10 is connected to the second end of the coil 10. Contact plates 16 and 17 have separable heads. The door piece 2 is set in its operating position and is connected to the housing 1 by means of a screw connection 3. when connected to the electromagnetic element 21 fixed to the separable headpiece 2. are positioned within the housing 1 so as to mesh to form a circuit of the coil 10. . In the embodiment described here, the electromagnetic element 21 is It is the ring upper end surface of the metal outer container 22 of the head piece 2. The refrigerant is (Fig. (not shown) along the connecting line through the nipple 24 to the pulp 80 inlet passage 23. is discharged from the outlet passage 25 through the nipple 26. The direction of flow is according to arrow A. is shown.

The plasma generator according to the present invention operates as follows.

After setting the headpiece 2 into the working position through the screw connection 3, the electromagnetic closing element The annular end surface functioning as a contact plate 21 is moved to close the contact plates 16 and 17. make This means that the supply circuit for the coil 10 of the solenoid-driven valve 8 is This is achieved by As a result, the rod 9 is struck by the force of the spring 12. until the collar 14 of the rod 9 presses against the wall of the housing of the valve 8. Move to the edge. In this position, the plurality of holes 13 are connected to the passages 23-4 and 23-4, respectively. and 25-5.

The refrigerant carried along the supply line passes from the passage 23 through the hole 13 into the housing 10. Flows freely to Route 4. Then, the head is passed through the line 6 to the passage 4 of the head piece 2. Flows around Do Piece 2. Then, from the housing 1 to the passage 5 along the line 7 through hole 13, passage 25, and exit through nipple 26 (in the direction of refrigerant flow). direction is indicated by arrows A and B).

After removing the headpiece 2, the plates 16 and 1 are removed together with the closure top 21. The contact between 7 is broken, the coil 10 is no longer energized and the spring 12 is Push rod 9 to the leftmost position. The hole 13 is the passage 4. On 5.23.25 Out of alignment, the rod 9 blocks the passage 23.25. as a result, The refrigerant cannot pass through the passages 4, 5 of the housing 1 and therefore has to be processed. It does not reach the workpiece.

After removing the headpiece 2, connect the rod 9 of the valve 8 in the passage 4.5. Refrigerant remaining between the pipe and the pipe (usually the minimum length) cannot flow out. Residue The weight of the refrigerant in the passage 4.5 is at atmospheric pressure (operating from less than Balanced by the adhesive strength of the liquid.

Headpiece 2 can be replaced either by an operator or a robot . Headpiece replacement does not involve refrigerant leakage. And the work to be processed It will not cause any damage to the piece.

The refrigerant used (when used at low temperatures) is an antifreeze agent. Like that In such cases, it is essential to conserve refrigerant.

The magnetic plasma generator described above was tested in the laboratory and in the field. water for cooling The consumption rate was 81 per minute. 50 ~ during one replacement of headpiece 2 70 grams of water was saved. This plasma generator has a cutting current of 60mm thickness. Tested for cutting 300A.

Possibility of application in industry Plasma generators are used by machinists for metal cutting, welding, jetting, and surface hardening processes. It can be used in mechanical engineering and all industrial fields.

Submission of translation of written amendment (Article 184-7, Paragraph 1 of the Patent Act) June 27, 1990 Yoshi, Commissioner of the Patent Office 1) Takeshi Moon 1 Display of patent application pcT/SU8810021B 2 Name of the invention plasma generator 3 Patent applicant Address Sohi: Eto Federation, 252650. Kyiv, Uritsabosenko, Day, 11 Address: Shizuko Toranomon Building, No. 8-1o, Toranomon-chome, Minato-ku, Tokyo 105'r! Story L (504) 07215 Date of submission of written amendment +December 989, 2J B (acceptance mill) International application PCT/S08g1002 Claim 1 amended for 18, connected to each other along the separation line (6, 7) separable with multiple passages (4, 5) for supplying and discharging refrigerant. Separate the housing (1) with the headpiece (2) and the headpiece (2). means for cutting off the supply of refrigerant to the passages (4, 5) when the plasma In a generator, it is used as a means to cut off the supply of the refrigerant to the passage. a number of through holes equal to the number of passages (4, 5) in said housing (1); Solenoid drive bar with a movable element in the form of a rod (9) with (13) tube (8), said hole having a cross-sectional area corresponding to the cross-sectional area of the passageway (, 4, 5). However, the rod (9) is connected to the solenoid drive at one of its two end positions. The supply circuit of the coil (10) of the moving valve (8) is closed and the hole (1) of the rod (9) is closed. 3) is at a position coaxial with the passage, and at the other of the two end positions, the solenoid The supply circuit of the coil (10) of the id-driven valve (8) is opened, and the rod (9) ) hole (13) is at an offset position with respect to the passage (4°5) for the rod (9). moving inside the housing (1) so as to block the passage hole in position; The housing (1) has a plurality of contact plates ( 16, 17>, each of which has a coil (10) of said solenoid-driven valve (9). is connected to one of both ends of the supply circuit of the The closed current transmission element (21) is mounted so as to mesh with the attached closing current transmission element (21). international search report

Claims (1)

[Claims] 1. for supplying and discharging refrigerant, connected to each other along the separation line (6, 7). a headpiece (2) having a plurality of valves (4, 5) for When separating the housing (1) and the headpiece (2), the refrigerant passages (4, 5) In the plasma generation device, the plasma generator is equipped with a means for cutting off the supply of the refrigerant to the refrigerant. The housing (1) mentioned above is used as a means to cut off the supply to the passage. of a rod (9) having a number of through holes (13) equal to the number of passages (4, 5) at a solenoid-operated valve (8) with a movable element shaped like a said rod (9) has a cross-sectional area corresponding to that of the channels (4, 5); In one of the end positions, the coil (10) of said solenoid-driven valve (8) The supply circuit is closed and the hole (13) of the rod (9) is coaxial with the passage, and the front At the other end position, the coil (1) of the solenoid-driven valve (8) The supply circuit of 0) is opened, and the hole (13) of the rod (9) is connected to the rod (9). Offset position to the second passageway (4,5) to block the passageway hole. is movable inside the housing (1) such that said housing (1) ) has a plurality of contact plates (16, 17) built into it, each of which Connected to one of both ends of the supply circuit of the coil (10) of the lenoid drive valve (9). , a closed current transmission element attached to said separable headpiece (2); (21) A plasma generation device characterized by being attached so as to mesh with the Place.