JP2586044Y2 - Cleaning plug for pumping pipe - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning plug for a pumping tube for pumping a conveyed material such as earth and sand.

[0002]

2. Description of the Related Art Conventionally, there is a shield machine in which earth and sand excavated by a cutter head and taken into a bulkhead are conveyed rearward by using a pressure pipe.
In the shield machine described above, since the earth and sand adhere and accumulate in the pumping pipe during a long period of use and the transport efficiency is reduced, the inside of the pumping pipe is periodically cleaned.

[0003] As a method for cleaning the pressure feed pipe, a plug c having a rubber film b provided on the front and rear surfaces of a cylindrical sponge a as shown in FIG. 1 is inserted into the pressure feed pipe d as shown in FIG. By applying water pressure from the rear, the pumped material e attached to the inner surface of the pumping tube d is pushed out, and the inside of the pumping tube d is washed. On the other hand, as a plug for cleaning the inside of a transport pipe, for example, a plug described in Japanese Patent Publication No. 52-6548 is known.

[0004]

However, in the case of the former plug c in which the rubber film b is provided before and after the sponge a, when the plug c is pressed into the pressure feed pipe d, the water pressure is increased due to wrinkles generated in the rubber film b. Since the fine particles in the pumped material e are washed away by passing to the e side, the pumped material e has only coarse particles and blocks the inside of the pumping pipe d, so that there is a problem that efficient cleaning cannot be performed.

In the plug described in the latter publication,
When cleaning the inside of a long-distance pumping tube due to a large frictional resistance with the pumping tube, there is a problem that the plug is blocked in the pumping tube and efficient cleaning cannot be performed. The present invention has been made in order to solve such a problem, and an object of the invention is to provide a cleaning plug for a pressure feeding tube which can efficiently clean the inside of the pressure feeding tube.

[0006]

In order to achieve the above object, the present invention provides a waterproof plug formed on a front end surface of a cylindrical plug body formed of a porous elastic body and a rear end of the plug body. The part is provided with an elastic cup that expands in the radial direction by water pressure.

[0007]

With the above structure, the plug body is press-fitted into the pressure-feeding pipe to be cleaned and high-pressure water is pressure-fed from the rear, so that the high-pressure water does not flow to the front of the plug body by the elastic cup. Can be washed well.

[0008]

One embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS. In FIG. 3, reference numeral 1 denotes a plug body, which is formed in a cylindrical shape by a porous elastic body such as a sponge, and provided with a waterproof film 2 such as a rubber film on one end surface.

On the other end of the plug body 1, there is formed a tapered portion 1a having a diameter gradually decreasing toward the end, and an elastic cup 3 is attached to an end surface of the tapered portion 1a on the small diameter side by bonding or the like. It is fixed. The elastic cup 3 is formed in a frustoconical shape by an elastic body such as rubber, and has a small-diameter end face fixed to the plug body 1 and a large-diameter end whose outer diameter is a pressure-feeding pipe to be cleaned. 4 is formed to have a slightly larger diameter than the inner diameter. The tapered recess 3a is formed in two stages on the large-diameter side end surface, so that the elastic cup 3 can be easily expanded and contracted in the radial direction.

Next, the operation will be described. In cleaning the inside of the pressure feed pipe 4, as shown in FIG.
Then, high-pressure water is injected from the rear of the plug body 1 by a pump (not shown) in this state. As a result, the water pressure that has reached the recess 3a of the elastic cup 3 pushes and expands the elastic cup 3 in the radial direction and presses the large-diameter-side outer peripheral surface against the inner peripheral surface of the pressure-feeding pipe 4.
And the plug body 1 moved in the pressure feed pipe 4 by the high-pressure water can wash the pressure-feed material 5 attached to the inner surface of the pressure feed pipe 4.

In the above embodiment, one plug main body 1 is press-fitted into the pressure feed pipe 4. However, if a plurality of plug main bodies 1 are continuously press-fitted, the water stopping effect is further improved, and efficient cleaning can be performed. Also, as shown in FIG. 5, if the cord body 6 such as a wire is attached to the plug body 1 in advance, even if the plug body 1 It can be easily taken out by pulling the object 6.

[0012]

As described in detail above, the present invention provides an elastic cup which expands in the radial direction by water pressure at the rear part of the plug body to prevent the water pressure from flowing forward of the plug body by the elastic cup. Because of the prevention, it is possible to prevent the fine particles of the conveyed material from being washed away by the water that has flowed out. As a result, the pumped material does not block in the pumping tube, so that the inside of the pumping tube can be efficiently washed, and the high-pressure water can be pumped into the pumping tube. Can be washed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a conventional cleaning plug.

FIG. 2 is an explanatory view showing a use state of a conventional cleaning plug.

FIG. 3 is a sectional view of a cleaning plug according to an embodiment of the present invention.

FIG. 4 is an explanatory view showing a use state of a cleaning plug according to an embodiment of the present invention.

FIG. 5 is a sectional view of a cleaning plug according to another embodiment of the present invention.

FIG. 6 is an explanatory view showing a use state of a cleaning plug according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plug body 2 Waterproof membrane 3 Elastic cup 4 Pumping tube 5 Pumping object

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-48-23259 (JP, A) JP-A-57-51689 (JP, U) JP-A-56-141793 (JP, U) JP-A-54- 77479 (JP, U) Actual opening 48-98062 (JP, U) Actual opening 50-36359 (JP, U) Actual opening 51-125765 (JP, U) Actual opening 54-77479 (JP, U) JP-B-52-6548 (JP, B2) JP-B-58-9316 (JP, B2) JP-B-63-1113 (JP, B2) JP-B-56-4467 (JP, Y2) JP-B-58-45832 (JP, Y2) 7-78065 (JP, Y2) (58) Field surveyed (Int. Cl. ⁶ , DB name) B08B 9/04

Claims (1)

(57) [Scope of request for utility model registration] 1. At the rear end of a cylindrical plug body (1) ,
A cleaning plug for a pressure feed pipe provided with an elastic cup (3) that expands radially by water pressure.