JPS6114784Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a telescopic bending pipe.

Conventionally, in an extensible curved tube in which an inner tube made of a curved tube is slidably inserted into an outer tube made of a curved tube along the axis, the insertion end of the inner tube into the outer tube is perpendicular to the axis. Therefore, the limit to which the inner tube can be compressed by inserting the inner tube into the outer tube is the point where the insertion end of the inner tube is located near the boundary between the outer tube, the curved tube section, and the straight tube section. Ta. That is, if the inner tube is inserted any further, the inner side in the radial direction of curvature of the outer tube insertion end of the inner tube will interfere with the inner surface of the outer tube. Therefore, when the inner tube is pulled out from the outer tube and stretched out, the inner surface of the curved section of the outer tube is always exposed to the inner tube passage, and the material passing through the tube collides violently with the outer side of the inner surface of the outer tube in the radial direction of curvature. The problem was that it wore out and had a short lifespan. In order to deal with wear on the inner surface of the outer tube, it is possible to increase the wall thickness of the outer tube, but in the case of an outer tube, it is not possible to increase the wall thickness by making only the outer part of the inner surface in the radial direction of curvature protrude inward. However, since the entire tube wall must be made thick, it is expensive, and concave portions are formed on the inner surface due to wear, which is undesirable. In this regard, in the case of an inner tube, there is no problem even if only the outer portion of the inner surface in the radial direction of curvature is made to protrude inward to make the wall thicker.

From the above points of view, the present invention provides that even when the inner tube is pulled out from the outer tube and stretched, the outer side in the radial direction of curvature of the inner tube covers part or all of the inner surface of the outer side of the outer tube in the radial direction of curvature. The purpose of the present invention is to provide a telescopic bending pipe that can prevent wear.

In the telescopic bendable tube of the present invention, the inner tube in the radial direction of curvature at the insertion end of the inner tube into the outer tube is cut out, so that the inner tube can be pulled out from the outer tube and the inner tube and the inner tube Even if the outer pipe in the radial direction of curvature covers the inner surface of the outer pipe, the inner part in the radial direction of curvature of the inner pipe is located away from the boundary between the curved pipe part and the straight pipe part of the outer pipe due to the notch. Therefore, even when the inner tube is inserted into the outer tube and contracted, the inner side of the inner tube in the radial direction of curvature does not interfere with the inner surface of the outer tube. In addition, in this contracted state, the outer part of the inner pipe in the radial direction of curvature crosses the boundary between the curved pipe part and the straight pipe part of the outer pipe, penetrates into the straight pipe part side, and protrudes somewhat inward, but the inner pipe There will be no major negative impact on the function of the road. Furthermore, the inner surface of the outer portion in the radial direction of curvature of the inner tube is made to protrude inward to provide a thick wall portion, thereby extending the life of the entire telescopic tube.

Hereinafter, one embodiment of the present invention will be described based on the drawings. Figure 1 shows a device for suctioning scum (slag) on the surface of molten metal, 1 is a suction tube, one end 1a of which has a suction head 2 attached, and the other end 1b a scum separation device (not shown). It is connected to a suction device (not shown) such as a vacuum pump via a vacuum pump or the like. The suction head 2 has a cooling water injection port for solidifying the suctioned scum, and is supported by a support device 3 so as to be movable in three dimensions. The suction tube 1 includes a first telescopically curved pipe 4, a telescoping straight pipe 5, a second telescopically curved pipe 6, and a turning pipe 7 from the one end 1a side. Next, the structure of the second telescoping tube 6 will be explained in detail with reference to FIG. 2. The main parts of the first telescopic pipe 4 are substantially the same as the second telescopic pipe 6, so the explanation will be omitted, and the second telescopic pipe 6 is an embodiment of the telescopic pipe. It will be explained as follows. Telescopic bending pipe 6
is composed of an outer tube 8 made of a curved tube, and an inner tube 9 made of an inner tube slidably inserted into the outer tube 8 along its axis. One end 8a of the outer tube 8 is provided with a sealing device 10 that is fitted to the outer surface of the inner tube 9 in a sealed manner, and the other end 8b is connected to the swirl tube 7 by a connecting flange 11. This turning tube 7 is connected to an annular frame 13 installed on a support frame 12.
It is fixedly supported by a rotating wheel body 16 which is rotatably supported via a thrust bearing 14 and a bearing metal 15. One end 9a side of the inner tube 9 is an outer tube 8.
The other end 9b is inserted concentrically into the inner tube and forms an insertion end into the outer tube, and the other end 9b is connected to a straight tube 18 communicating with the reduced straight tube 5 via a connecting flange 17.
A free end of an arm 20 that is rotatable around the center of curvature 0 of the outer tube 8 and the inner tube 9 is fixed to a support frame 19 fixed to the outer periphery of the straight tube 18 near the connecting end with the inner tube 9. When the straight tube 18 moves up and down around the center of curvature 0, the inner tube 9 slides along the axis relative to the outer tube 8, and the expandable and retractable tube 6 is configured to expand and contract. The arm 20 has a bearing 22 mounted on a rotating table 21 that is rotatable around the axis of the rotating tube 7.
It is rotatably supported by. Said inner tube 9
As shown in Fig. 4, on the outside in the radial direction of curvature,
A thick wall portion 23 having a peak portion 23a and a flat portion 23b that protrudes inside the tube is formed over almost the entire length,
A notch 24 is formed in the one end 9a by obliquely cutting out the inner side in the radial direction of curvature. and,
As shown in FIG. 2, when the inner tube 9 is pulled out from the outer tube 8 and the telescopic tube 6 is extended, one end 9a of the inner tube
The inner edge 25 in the radial direction of curvature is located away from the other end 8b of the outer tube 8 toward the one end 8a side by the notch 24, and the outer edge 25 in the radial direction of curvature of the one end 9a of the inner tube
6 extends beyond one end 8b of the outer tube 8, and the inner surface of the outer side in the radial direction of curvature of the outer tube 8 is entirely covered by the inner tube 8. As shown in FIG. 3, the sealing device 10 for one end 8a of the outer tube 8 includes an asbestos packing 28 held between a pair of annular holding plates 27a and 27b and fitted to the outer surface of the inner tube, and the asbestos packing 28. an annular coil spring 29 that is fitted around the outer periphery of the outer tube and presses it radially inward; and a press ring that holds the pair of annular holding plates 27a and 27b, which are holding the asbestos packing 28, between one end surface 30 of the outer tube. 31, and a bolt 33 for fastening the push ring 31 to an annular protrusion 32 protruding from the outer periphery of the outer tube end portion 8a.

In the above configuration, when the suction head 2 is raised from the state shown in FIGS. 1 and 2 where the suction head 2 is located near the lowering limit, the straight pipe 18 rotates upward at the telescopic bent pipe 6 section. , the inner tube 9 is inserted into the outer tube 8 while sliding relative to the outer tube 8 along its axis. When the suction head 2 reaches its upper limit, as shown by the imaginary line in Fig. 2,
The inner edge 25 in the radial direction of curvature of the one end portion 9a of the inner tube is located beyond and in the vicinity of the other end portion 8b of the outer tube 8, and the outer edge 26 in the radial direction of curvature of the one end portion 9a of the inner tube is located near the other end portion 8b of the outer tube 8.
The scum penetrates deeply into the swirl pipe 7 and protrudes inside the swirl pipe 7, but it does not pose a particularly large obstacle to the function of the pipe, and is particularly useful in scum suction devices. There is no problem at all since it will not be possible. On the other hand, suction head 2
When the scum is suctioned while moving the scum and the scum is transferred along with the suction airflow through the suction pipe 1, the scum is transferred to the outside in the radial direction of curvature of the inner surface of the tube at the telescopic bent tubes 4 and 6 due to the large specific gravity of the scum. The collision causes wear on the inner surface of the tube, but since the thick wall portion 23 of the inner tube 9 is located in this area, the inner surface of the outer tube 8 does not wear out, and the life of the inner tube 9 against wear is also long. It can be made longer by the flesh part 23.

According to the telescopic curved tube of the present invention, as is clear from the above description, the inner tube in the radial direction of curvature at the insertion end of the inner tube into the outer tube is notched, and the outer tube in the radial direction of curvature extends over almost the entire length of the inner tube. By configuring the inner surface of the part to be a thick part that protrudes inward, a part or all of the outer part in the radial direction of the curvature of the inner surface of the outer pipe can be expanded and contracted by relative sliding of the inner pipe with respect to the outer pipe. It is possible to prevent abrasion of the inner tube by covering it with a thick wall part, and also to prevent abrasion of the inner tube by covering it with a thick wall, thereby extending the life of the entire telescopic tube.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of a scum removal device using a telescoping pipe according to the invention, Fig. 2 is a longitudinal cross-sectional view of the telescoping pipe, and Fig. 3 is a sealing device. FIG. 4 is a cross-sectional view of the inner tube. 1...Suction tube, 2...Suction head, 4,
6... Telescopic bending tube, 8... Outer tube, 8a... One end of outer tube, 9... Inner tube, 9a... One end of inner tube (insertion end of inner tube into outer tube), 10... sealing device, 11,
17... Connection flange, 23... Thick wall part, 24...
...notch portion, 25...inner side in the radial direction of curvature of one end 9a of the inner tube, 26... outer side in the radial direction of curvature of one end 9a of the inner tube.

Claims (1)

[Scope of utility model registration request] The inner tube is slidably inserted into the outer tube made of a curved tube along its axis, and the inner tube in the radial direction of curvature of the insertion end of the inner tube into the outer tube is notched,
A telescopic curved pipe characterized in that the inner surface of the outer part in the radial direction of curvature extending over almost the entire length of the inner pipe is formed into a thick walled part that protrudes inward.