JPH0325246B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is applicable to, for example, melting of steel ingots, opening of tapholes in blast furnaces, buildings and other structures such as reinforced concrete, rocks, Oxygen lance lance pipes for interconnecting lance pipes used for oxygen lance cutting to perform drilling, cutting, and demolition while melting objects to be melted such as steel frames, underwater structures, and rock reefs. Regarding connection method.

(Prior art) Oxygen lance cutting involves flowing high-pressure oxygen into the pipe from the proximal end of the lance pipe, exposing the tip of the lance pipe to the oxygen that blows out, and igniting and burning the tip of the lance pipe. The workpiece is perforated and cut using high heat caused by oxidation reaction, flame, and mechanical pressure.

Conventionally, lance pipes (combustion steel pipes) used as oxygen lances are subject to rapid wear, and therefore considerably long ones (several meters) are often used.
Moreover, during work, lance pipes of appropriate length are often connected and used (for example, lance pipes used for opening tapholes in blast furnaces are subject to rapid wear, so lance pipes of a suitable length are often used). (approximately 3m to 5m) are often used by connecting multiple (about 3 to 5) wires).

Then, as a specific means for this connection, for example, cut a thread on the inner circumferential surface or outer circumferential surface of each end of the lance pipe (combustion steel pipe) to be connected, and then attach a threaded part to the inner or outer wall surface. The lance pipes are connected to each other by screwing the lance pipes from both ends into pipe fittings such as nipples and sockets.

In addition, the lance pipe is inserted from both sides into a short pipe with a larger diameter than the lance pipe (combustion steel pipe), and the circumferential wall of the short pipe is crimped with an appropriate caulking machine so that the outside is visible and protrudes toward the cylinder core, and at the same time it is plastically deformed. Similarly, lance pipes are also connected by plastic deformation. Or,
As in the method of connecting an oxygen lance described in Japanese Patent Publication No. 57-5994, a short tube having a tightening part whose end diameter is larger than the lance pipe outer diameter and gradually becomes smaller than the lance pipe outer diameter toward the center. Another method is to connect the lance pipe by force-fitting it into the pipe by strongly tapping or driving the end of the pipe.

Furthermore, as in the pipe joint and its forming method and forming apparatus described in Japanese Patent Application Laid-Open No. 57-11735,
The end of the first tube is inserted into the end of the second tube, and the end of the second tube (the part surrounding the end of the first tube)
Means for connecting the first tube and the second tube by deforming the first tube to form a depression on the outer surface of the first tube has also been adopted.

(Problem to be Solved by the Invention) However, it is difficult to connect pipe fittings such as nipples and sockets by cutting threads on the inner circumferential surface or outer circumferential surface of each end of the lance pipe to be connected, and having a threaded portion on the inner or outer wall surface. The method of connecting the lance pipes by screwing the lance pipes in from both ends prevents damage to the threads, breakage of the threaded part due to thinning of the threaded part, and the possibility of matching the cylindrical centers of the lance pipes. If the screws are not supported in the correct position, the screws will not screw together, and the connection work takes too much time and effort.Moreover, the thread cutting work is very troublesome, and the work efficiency is extremely low.

Also, insert the lance pipe into both ends of the short pipe,
The method of connecting by plastically deforming the circumferential wall of the short pipe with an appropriate caulking machine and also plastically deforming the lance pipe at the same time requires quite strong tightening pressure to plastically deform the lance pipe together with the short pipe. Moreover, the tightening condition tends to be insufficient, making it difficult to obtain a strong connection, requiring a powerful caulking machine that can exert sufficient tightening pressure, and a jig to fix lance pipes, etc., making the work difficult. There were drawbacks such as it was not easy to perform and was inconvenient to handle.

Furthermore, the method of press-fitting a lance pipe into a short pipe that has a tightening part by strongly tapping or driving the end thereof is very effective when connecting a relatively short lance pipe with a small diameter. However, when connecting a lance pipe with a relatively large diameter (for example, 40 mm or more), or when connecting a long lance pipe with a small diameter, a strong force may be required to press fit the lance pipe, or the lance pipe may be It has the disadvantage that it is easily bent and cannot be connected straight, making it difficult to obtain a strong and reliable connection.

Then, the end of the first tube is inserted into the end of the second tube, and the end of the second tube (the part surrounding the end of the first tube) is deformed to form the first tube. The means for forming a depression on the outer surface of the tube is formed so that the end of the second tube is widened in advance into a predetermined shape so that the end of the first tube can be inserted into the end of the second tube. It was very troublesome. In particular, these operations are suitable for connecting simple cylindrical pipes to each other, but when trying to connect lance pipes for oxygen lances, the lance pipes are usually exposed to high temperatures that promote oxidation reactions. In order to obtain mechanical strength and improve sustainability,
Many of them are composed of multiple tubes or have multiple metal wires arranged between the multiple tubes, and the ends of these are expanded into a predetermined shape.
It was difficult to insert other lance pipes into this end. That is, it could hardly be used as a means for interconnecting lance pipes as described above.

(Means for Solving the Problems) Therefore, the present invention was created in order to solve the above-mentioned problems and to provide a method that is optimal as a means for connecting lance pipes for oxygen lances. Specifically, one lance pipe P is set in one pipe chuck A, the other lance pipe P is set in the other pipe chuck B, and the lance pipe P is moved from the center to the other end of the other lance pipe P. Accordingly, one end of the joint pipe P1, whose both end portions are formed so as to gradually expand, is set in such a manner that one end of the joint pipe P1 is fitted onto the outside. Then, while operating the hydraulic pump 10, the chuck valve 1
1 is opened, the pipe chucks A and B are actuated by hydraulic pressure from the hydraulic pump 10 via the hydraulic pipe 14, and the vicinity of the end of each lance pipe P is clamped by the pipe chucks A and B, respectively. Next, the sliding valve 12 is opened and the hydraulic pump 1 is connected via the hydraulic pipe 14.
The sliding body 15 is made to slide against the elastic force of the spring 16 using hydraulic pressure from 0, and one pipe chuck A connected to the sliding body 15 is moved to the side of the other pipe chuck B, and one lance is moved. The pipe P is forcibly fitted into the joint pipe P1, the joint pipe P1 is moved to the side of the other lance pipe P, and the other lance pipe P is forcibly fitted into the joint pipe P1. Then, after one lance pipe P and the other lance pipe P are fitted into the joint pipe P1 in a predetermined state, the clamping pressure valve 13 is opened, and one of the lance pipes P is fitted with hydraulic pressure from the hydraulic pump 10 via the hydraulic pipe 14. The clamping pressure chuck C provided between the pipe chuck A and the other pipe chuck B is activated.
The lance pipe P and the joint pipe P1 on one side are clamped, and the lance pipe P and the joint pipe P1 on the other hand are clamped at the connecting portions of the joint pipe P1.
and the joint pipe P1, and a means for connecting the pair of lance pipes P via the joint pipe P1 by providing a recess 1 in each of the other lance pipe P and the joint pipe P1.

(Function) Therefore, one lance pipe P set in one pipe chuck A and the other lance pipe P set in the other pipe chuck B are as follows.
It is held between pipe chucks A and B, which are activated by opening the chuck valve 11. One pipe chuck A is the sliding valve 1.
2, the sliding body 15 that slides against the elastic force of the spring 16 moves to the other side of the pipe chuck B, and is forcibly fitted into the joint pipe P1, and the joint pipe P1 is moved to the other side. lance pipe P so that the other lance pipe P is forcibly fitted into the joint pipe P1. After one lance pipe P and the other lance pipe P are fitted into the joint pipe P1 in a predetermined state, by opening the clamping pressure valve 13, the clamping pressure chuck C is activated by the hydraulic pressure from the hydraulic pump 10. When the lance pipe P and the joint pipe P1 on one side are operated, and the joint pipe P1 and the other lance pipe P and the joint pipe P1 are clamped by the clamping chuck C, a protrusion of the clamping chuck C is attached to the connecting part. A depression 1 formed by C1 is provided.

(Example) Hereinafter, the present invention will be explained with reference to illustrated examples.

First, one lance pipe P is set (placed) on one pipe chuck A, and the other lance pipe P is set (placed) on the other pipe chuck B.
do. In addition, at this time, the other end of the other lance pipe P has both end portions formed so as to gradually expand from the center to the end, so that one end of the joint pipe P1 does not fall off. It is set so that it fits snugly. In addition, the joint pipe P1 is
It may be set at one end of one lance pipe P, or it may be set so as to straddle one end of one lance pipe P and the other end of the other lance pipe P.

Then, while operating the hydraulic pump 10, the chuck valve 11 is opened, and the pipe chucks A and B are operated by the hydraulic pressure from the hydraulic pump 10. to hold. At this time, the hydraulic pressure from the hydraulic pump 10 acts on each pipe chuck A, B through the hydraulic pipe 14, and in each pipe chuck A, B, a moving piece and a fixed piece that move back and forth by the hydraulic pressure are used as lances. It is formed to be able to securely clamp the pipe P. In addition, pipe chuck A,
Appropriate small protrusions are provided in advance on the pipe clamping surface of the movable piece (or the fixed piece, or the moving piece and the fixed piece) of B, and when the pipe chucks A and B are activated,
When the lance pipe P is clamped between the movable piece and the fixed piece, the small protrusion bites into the lance pipe P, preventing slippage between the pipe clamping surface and the lance pipe P, and ensuring the clamped state. You may also set it so that

Next, the sliding valve 12 is opened, and the sliding body 15 is slid in a predetermined direction against the elastic force of the spring 16 using hydraulic pressure from the hydraulic pump 10.
One pipe chuck A linked (connected) to this sliding body 15 is moved toward the other pipe chuck B, one lance pipe P is forcibly fitted into the joint pipe P1, and the joint pipe P1 is forced into the joint pipe P1. Move the lance pipe P together with the other lance pipe P, and connect the joint pipe P1.
Forcibly insert the other lance pipe P into the
The pair of lance pipes P are connected via the joint pipe P1 with one lance pipe P and the other lance pipe P being forcibly fitted into the joint pipe P1 in a predetermined state.

That is, one end of one of the lance pipes P is fitted into the other end of the joint pipe P1, which is formed so as to gradually expand from the center in the longitudinal direction to the end, and the other end of the joint pipe P1 is inserted into the other end of the joint pipe P1. As the lance pipe P expands, one end of the lance pipe P becomes narrowed by the joint pipe P1, and the connection between the lance pipe P and the joint pipe P1 becomes strong. The other end of the other lance pipe P, which is fixed to the other pipe chuck B, is fitted into one end of the joint pipe P1, which is formed to gradually expand from the center in the longitudinal direction to the end. Then, one end of the joint pipe P1 is expanded, and the other end of the other lance pipe P is narrowed by the joint pipe P1, thereby changing the connection state between the other lance pipe P and the joint pipe P1. becomes strong.

Furthermore, after one lance pipe P and the other lance pipe P are fitted into the joint pipe P1 in a predetermined state, the pressure of the hydraulic pump 10 is increased, the clamping pressure valve 13 is opened, and the clamping pressure valve 13 is opened. The hydraulic pressure from the hydraulic pump 10 is transmitted to a clamping pressure chuck C provided between one pipe chuck A and the other pipe chuck B, and this clamping pressure chuck C is operated. Then, the clamping chuck C clamps the connecting portions of one lance pipe P and the joint pipe P1, and the other lance pipe P and joint pipe P1, thereby increasing the adhesion of the respective connecting portions, and
A protrusion C1 protruding from the clamping pressure surface of the clamping pressure chuck C
The lance pipe P and the joint pipe P1 on one side, and the lance pipe P and the joint pipe P1 on the other side are each provided with a depression 1 formed by plastically deforming them, and the pair of lance pipes P are connected through the joint pipe P1. Connect permanently.

By the way, the sliding body 15 (one pipe chuck A) is pushed back to a predetermined position by the elastic force of the spring 16 when the hydraulic pressure from the hydraulic pump 10 is weakened.

In addition, the specific configuration and shape of one lance pipe P, the other lance pipe P, and the joint pipe P1,
The materials, dimensions, etc. are not limited to those shown in the illustrated examples. For example, the end shape, dimensions, etc. of the joint pipe P1 are set according to the end shape, dimensions, etc. of one lance pipe P and the other lance pipe P. By the way, the joint pipe P1 has a suitable protrusion that projects inwardly provided in advance approximately at the center in the direction of the cylindrical core, and one lance pipe P and the joint pipe P1, and the other lance pipe P and the joint pipe P.
1, the connection state (length of the inserted portion, etc.) may be the same to maintain balance in terms of strength. That is, one lance pipe P and joint pipe P1, the other lance pipe P
If the resistances at the time of fitting and the joint pipe P1 are significantly different, it is possible to prevent the fitting state of the one with less resistance from progressing and the connection state becoming incomplete. The protrusion may be one or more protruding in the circumferential direction of the joint pipe P1,
It may be provided entirely along the circumference.

Further, the specific structure, shape, etc. of one pipe chuck A, the other pipe chuck B, the clamping pressure chuck C, and the protrusion C1 are not limited to the illustrated example, and can be freely set as appropriate.
The chuck valve 11, the sliding valve 12, and the clamping pressure valve 13 may be either automatically or manually controlled. , hydraulic pipe 1
4. Specific configuration of the sliding body 15 and spring 16,
The shape, material, etc. can also be freely set as appropriate without being limited to the illustrated examples.

(Effect of the invention) Therefore, the present invention sets one lance pipe P in one pipe chuck A, sets the other lance pipe P in the other pipe chuck B, and
The other end of the other lance pipe P is set in such a manner that one end of the joint pipe P1, whose both end portions are formed so as to gradually expand from the center to the end, is fitted onto the other end of the other lance pipe P, and hydraulic pump 10
At the same time, the chuck valve 11 is opened, and the pipe chucks A and B are operated by hydraulic pressure from the hydraulic pump 10 via the hydraulic pipe 14.
The vicinity of the end of each lance pipe P is held between pipe chucks A and B, and then the sliding valve 12 is opened, and the sliding body 15 is moved by the force of the hydraulic pressure from the hydraulic pump 10 via the hydraulic pipe 14. One pipe chuck A connected to the sliding body 15 is slid against the force, and the other pipe chuck B is connected to the sliding body 15.
The lance pipe P is forced to fit into the joint pipe P1, and the joint pipe P1 is moved to the side of the other lance pipe P, and the other lance pipe P is inserted into the joint pipe P1.
After one lance pipe P and the other lance pipe P are fitted into the joint pipe P1 in a predetermined state, the clamping pressure valve 13 is opened, and the pressure is supplied from the hydraulic pump 10 via the hydraulic pipe 14. The clamping pressure chuck C provided between one pipe chuck A and the other pipe chuck B is operated with the hydraulic pressure of While clamping the connecting portions of each of the joint pipes P1, a protrusion C1 protruding from the clamping pressure surface of the clamping chuck C connects one of the lance pipes P and the joint pipe P1,
Since a recess 1 is provided in each of the other lance pipe P and the joint pipe P1, and the pair of lance pipes P are connected via the joint pipe P1, one lance pipe P and the other lance pipe P are connected to each other as a joint pipe. A strong and accurate connection can be made via P1, and the connection work can be easily performed by one person, and the work efficiency of the connection work of the pair of lance pipes P can be greatly improved. Furthermore, a strong connection between the pair of lance pipes P can be obtained, and breakage at the connection portion can be reliably prevented. Moreover, the speed and ease of the connection work of the lance pipe P is reliably improved.

In particular, since we used a joint pipe P1 that gradually expands from the center to the end in the longitudinal direction,
One lance pipe P and the other lance pipe P
The forced fitting operation into each joint pipe P1 can be carried out smoothly, and the tightness at the connecting portions is also extremely good. Moreover, usually
The lance pipe P for oxygen lance, which is composed of multiple tubes or multiple metal wires arranged between multiple tubes, can be made into a specified shape without having to undergo special processing in advance. By simply preparing P1, these can be easily connected, and this is the best method for connecting lance pipes P for oxygen lances.

In addition, the sliding valve 12 is opened, and the sliding body 15 is caused to slide against the elastic force of the spring 16 with the hydraulic pressure from the hydraulic pump 10 via the hydraulic pipe 14.
Since one pipe chuck A connected to the sliding body 15 is moved sideways to the other pipe chuck B, when the hydraulic pressure from the hydraulic pump 10 is weakened, the sliding body 15 is moved by the elastic force of the spring 16.
(One pipe chuck A) can be automatically pushed back to a predetermined position.

Furthermore, after one lance pipe P and the other lance pipe P are fitted into the joint pipe P1 in a predetermined state, the clamping pressure valve 13 is opened, and one of the lance pipes is Activate the clamping pressure chuck C provided between the pipe chuck A and the other pipe chuck B, and the clamping pressure chuck C connects one lance pipe P and the joint pipe P1, and the other lance pipe P and the joint pipe P.
Since each connection part of 1 is clamped, the clamping work of the connection part between one lance pipe P and the other lance pipe P can be performed easily and quickly, and the adhesion at the mutual connection part of the lance pipes P is improved. It becomes extremely good.

Then, the protrusion C1 protruding from the clamping pressure surface of the clamping chuck C connects one lance pipe P with the joint pipe P.
1, and the other lance pipe P and joint pipe P1
Since the recesses 1 are provided in each of the lance pipes, the mutual connection between the lance pipes P becomes reliable and strong, and the lance pipes P can be reliably prevented from coming off.

[Brief explanation of the drawing]

The drawings illustrate the present invention; FIG. 1 is a schematic diagram, FIGS. 2 and 3 are cross-sectional views showing how pipes are connected, and FIG. 4 is a diagram showing how pipes are connected in another embodiment. FIG. A... Pipe chuck, B... Pipe chuck, C... Clamping chuck, C1... Protrusion, 1...
... depression, 10 ... hydraulic pump, 11 ... chuck valve, 12 ... sliding valve, 13 ... clamping pressure valve, 14 ... hydraulic pipe, 15 ... sliding body, 1
6...Spring, P...Lance pipe, P1...
...Fitting pipe.

Claims (1)

[Claims] 1 Set one lance pipe in one pipe chuck, set the other lance pipe in the other pipe chuck, and set the lance pipe at the other end of the other lance pipe so that it gradually expands from the center to the end. One end of the joint pipe with both end portions formed is set in such a manner that it is fitted externally, and
At the same time as operating the hydraulic pump, open the chuck valves, operate each pipe chuck with hydraulic pressure from the hydraulic pump via the hydraulic pipe, clamp the vicinity of the end of each lance pipe with each pipe chuck, and then Open the valve, use hydraulic pressure from the hydraulic pump via the hydraulic pipe to slide the sliding body against the spring force, and move one pipe chuck connected to the sliding body to the side of the other pipe chuck. At the same time, one of the lance pipes is forced to fit into the joint pipe, and the joint pipe is moved to the side of the other lance pipe, and the other lance pipe is forcibly fitted into the joint pipe. After the other lance pipe and the other lance pipe are inserted into the joint pipe in a predetermined state, the clamping pressure valve is opened, and the clamping pressure valve is applied to the clamping pressure provided between one pipe chuck and the other pipe chuck using hydraulic pressure from the hydraulic pump via the hydraulic pipe. When the pressure chuck is activated, the clamping chuck clamps the connecting portions between one lance pipe and the joint pipe, and the other lance pipe and the joint pipe, and the protrusion protruding from the clamping surface of the clamping chuck clamps the connecting portion between the lance pipe and the joint pipe on the other side. A method for connecting a lance pipe for an oxygen lance, characterized in that a lance pipe and a joint pipe, and a recessed portion are provided in each of the other lance pipe and the joint pipe, and a pair of lance pipes are connected via the joint pipe.