JPS6234630Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a centrifugal projection lining device for spraying a lining material onto the inner periphery of a formed tube.

As such a centrifugal projection lining device,
For example, there is a method in which the lining material from a plurality of blow-off holes drilled in the wall of the inner tube is projected onto the inner circumference of the forming tube using centrifugal rotary blades disposed around the outer circumference of the inner tube.

By the way, in cast iron pipes formed by, for example, centrifugal casting, the lining layer needs to be considerably thick in order to improve its anticorrosion performance. However, if a large amount of lining material is projected at once using the centrifugal projection lining device as described above, there is a risk that the lining material may sag.

Therefore, an object of the present invention is to prevent the lining material from sagging by projecting the lining material in small amounts several times.

For this reason, the present invention has a first group of blow-off holes on the proximal end side of the inner tube, which is movable in the axial direction within the formed tube, and into which a lining material is injected, and a second group on the distal end side of the inner tube. Groups of blow-off holes are arranged at appropriate intervals in the axial direction of the inner tube, and the lining material from the blow-off hole groups is applied to the inner circumference of the formed tube in the inner tube portion where each blow-off hole group is arranged. centrifugal rotary blades are fitted onto the outer surfaces of the centrifugal rotary blades, and the first blow-off holes constituting the first blow-off hole group are formed to have a large diameter;
The second blow-off holes constituting the second blow-off hole group,
It is formed to have a smaller diameter than the first blowout hole.

Therefore, after the lining material projected from the first group of blow holes has stably adhered, the next lining material projected from the second group of blow holes can be projected and coated again. Not only can it prevent the lining material from sagging and can form a lining layer with a predetermined thickness, but also a large amount of lining material can be projected because the first blowout hole has a large diameter. In particular, good adhesion to the inner surface of the molded tube can be achieved, and since the second blowout hole has a small diameter, a small amount of lining material is projected, resulting in good shaping of the inner surface. It is something that can be made into something.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 shows its schematic configuration. That is, 1 is a formed tube arranged in the horizontal direction, and is a straight tube formed by centrifugal casting or the like. Reference numeral 2 denotes a centrifugal projection type lining device according to the present invention, in which a cart 4 that can run on a floor 3 in the direction of the arrow A is provided with a rod 5 that can be inserted into the forming pipe 1 and protrudes laterally. . A rotary spatula device 6 and centrifugal rotary blades 7A and 7B are disposed at the tip of the rod portion 5.

FIG. 2 is a longitudinal sectional view showing the details. Here, 8 is an inner tube constituting the rod portion 5, and its base end portion 9 is fixed to the truck 4. 10 is an injection port for mortar material 11 as a lining material. A blowout hole group 13A is provided at the distal end of the inner tube 8, in which a plurality of blowout holes 12A are arranged in double rows in the circumferential direction. At the tip of this blow-off hole group 13A, blow-off holes 12B having a smaller diameter than the blow-off holes 12A are arranged in the same manner as above.
3B is provided. Further, the outer diameter of the inner tube 8 of the outlet hole group 13B portion is formed to be the same as that of the outlet hole group 13A portion, and the inner diameter of the inner tube 8 of the outlet hole group 13B portion is smaller than that of the outlet hole group 13A portion. There is. As a result, the outlet group 1 of the mortar material 11
The amount of air blown from the air outlet 3A is approximately equal to the amount of air blown from the air outlet group 13B. The outlet hole group 13A portion and the outlet hole group 13B portion of the inner tube 8 are connected by a thin tube 14 having an inner diameter equal to the inner diameter of the outlet hole group 13B portion.

The centrifugal rotary blades 7A, 7B are arranged on the outer periphery of the inner tube 8 portion corresponding to the blow-off hole groups 13A and 13B, respectively, and both have a pair of opposing disks 15A, 15B, both disks 15A, It is composed of a plurality of blade plates 16 (see FIG. 3) arranged radially between the blades 15B. Rotating blade 7
A and the rotary vane 7B are connected to each other by a cylindrical body 18 that is fitted onto the thin tube 14 and has an inspection window 17, and the rotary vane 7A is fitted onto the inner tube 8 of the rod portion 5. A cylindrical body 19 is connected.
A pulley 2 is fitted onto the cylindrical body 19 near the proximal end 9 of the inner tube 8 and driven by a belt by a motor disposed within the truck 4.
0 is connected. The cylindrical bodies 18, 19 and the pulley 20 are each supported by the inner tube 8 through bearings 21, so that the rotating blades 7A, 7B can rotate together at high speed. 22 is a sealing material;
23 is a retaining ring.

The rotating spatula device 6 is disposed at the tip of the inner tube 8. That is, 24 is a lid part connected to the tip of the inner tube 8 to close the inner tube 8, and a drain hole 25 of the inner tube 8 is formed. 26 is a plug. A motor 28 is installed on a bracket 27 attached to the tip of the lid 24, and drives a rotary plate 29 fitted onto the lid 24 via a gear 30. 31 is a power supply pipe arranged along the axis of the inner tube 8, through which an electric wire to the motor 28 or air for driving the motor 28 is passed. A spatula support rod 32 extending in the radial direction of the forming tube 1 is erected on the rotating plate 29, and a spatula plate 33 is attached to the tip thereof.

Explain the lining construction method. First, as shown in FIG. 1, the cart 4 is moved and the rod portion 5 is inserted into the forming tube 1. Next, as shown in FIG. 2, if the mortar material 11 is pressurized and injected into the inner tube 8 and the rotating blades 7A and 7B are rotated at high speed, the mortar material is sent out from the blow-off hole groups 13A and 13B. 11 are projected onto the inner periphery of the forming tube 1 by centrifugal force by the rotating blades 7A and 7B, respectively.

When the lining device 2 is moved in the axial direction B of the forming tube 1, the mortar material 11 from the rotary blade 7A is first projected onto the inner circumference of the forming tube 1 to form a stably adhered lining layer 34. Thereafter, the mortar material 11 from the rotary blade 7B is projected onto the inner periphery of this lining layer 34 and coated over again, thereby forming the lining layer 34 to a predetermined thickness. Finally, due to the action of the rotary spatula device 6, the mortar lining layer 34 is given a smooth inner surface finish.

As described above, according to the present invention, after the lining material projected from the first group of blowholes has stably adhered, the next lining material projected from the second group of blowholes is projected and coated again. This not only makes it possible to prevent the lining material from sagging and form a lining layer with a predetermined thickness, but also allows for the formation of a lining layer with a predetermined thickness. Since the lining material is projected, good adhesion to the inner surface of the molded tube can be achieved, and since the second blowing hole has a small diameter, a small amount of the lining material is projected. The inner surface shaping property can be improved.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a diagram showing its schematic configuration, FIG. 2 is a vertical cross-sectional view showing its details, and FIG. 3 is a schematic cross-sectional view of a rotating blade portion. 1... Molding tube, 6... Rotating spatula device, 7A, 7
B...Centrifugal rotating blade, 8...Inner pipe, 11...Mortar material (lining material), 12A, 12B...
Blowout holes, 13A, 13B... Blowout hole group, B... Axial direction.

Claims (1)

[Scope of utility model registration request] a first group of blow-off holes on the proximal end side of the inner tube, each of which has a plurality of blow-off holes in the inner tube which is movable in the axial direction within the molded tube and into which a lining material is injected; A second group of blow-off holes on the tip side of the inner tube are arranged at appropriate intervals in the axial direction of the inner tube, and air from this blow-off hole group is placed in the inner tube portion where each blow-off hole group is arranged. Centrifugal rotary blades for projecting the lining material onto the inner periphery of the forming tube are fitted onto the outside of each of the molded pipes, and the first blow-off holes constituting the first blow-off hole group are formed to have a large diameter. A centrifugal projection type lining device characterized in that the second blow-off hole constituting the blow-off hole group is formed to have a smaller diameter than the first blow-off hole.