JPH0681684U - Cleaning pipe for pressure pipe - Google Patents

Abstract

(57) [Summary] [Purpose] Efficiently clean the inside of the pressure feed pipe. [Structure] A waterproof film 2 is formed on the front end surface of a cylindrical plug body 1 formed of a porous elastic body, and an elastic cup 3 is formed at the rear end portion of the plug body 1 so as to expand radially by water pressure. Since the elastic cup 3 blocks the high-pressure water from flowing out to the front of the plug body 1, the inside of the pressure feed pipe 4 can be efficiently cleaned.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cleaning plug for a pressure-feeding pipe, which pressure-feeds a substance such as earth and sand.

[0002]

[Prior art]

 Conventionally, there is a shield machine in which the earth and sand excavated by the cutter head and taken into the bulkhead are conveyed backward using a pressure-feeding pipe. In the shield machine as described above, the soil and sand adhere to and accumulate in the pumping pipe during long-term use, which lowers the transportation efficiency. Therefore, the inside of the pumping pipe is regularly cleaned.

As a method for cleaning the pressure-feeding pipe, a plug c having a rubber film b on the front and rear surfaces of a cylindrical sponge a as shown in FIG. 1 is inserted into the pressure-feeding pipe d as shown in FIG. By applying water pressure from the rear, the pressure-fed object e attached to the inner surface of the pressure-feed pipe d is pushed out to clean the inside of the pressure-feed pipe d. On the other hand, as a plug for cleaning the inside of the transportation pipe, for example, one described in Japanese Patent Publication No. 52-6548 is known.

[0004]

[Problems to be solved by the device]

 However, in the former plug c in which the rubber film b is provided before and after the sponge a, when the plug c is press-fitted into the pressure-feeding pipe d, the water pressure escapes to the pressure-feeding object e side due to the wrinkles generated in the rubber film b. Since the fine particles of No. 1 are washed away, the pressure-feed material e becomes only coarse particles and blocks the inside of the pressure-feeding pipe d, which causes a problem that efficient cleaning cannot be performed.

Further, since the plug described in the latter publication has a large frictional resistance with the pressure-feeding pipe, when cleaning the inside of the pressure-feeding pipe having a long distance, the plug is clogged in the pressure-feeding pipe, which results in efficient cleaning. There was a problem such as not being able to do it. The present invention has been made to solve such a problem, and an object thereof is to provide a cleaning plug for a pressure-feeding pipe capable of efficiently cleaning the inside of the pressure-feeding pipe.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention forms a waterproof film on the front end surface of a cylindrical plug body formed of a porous elastic body, and at the rear end portion of the plug body, expands radially by water pressure. An elastic cup that opens is provided.

[0007]

[Action]

 With the above configuration, the plug body is press-fitted into the pressure-feeding pipe to be washed and the high-pressure water is pressure-fed from the rear, so that the high-pressure water does not flow out to the front of the plug body due to the elastic cup, so the inside of the pressure-feeding pipe is efficiently washed. can do.

[0008]

【Example】

 An 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 into a cylindrical shape by a porous elastic body such as sponge, and a waterproof film 2 such as a rubber film is provided on an end face on one end side.

A taper portion 1a is formed on the other end side of the plug body 1 so as to have a diameter that gradually decreases toward the end portion. An elastic cup 3 is adhered to the end surface of the taper portion 1a on the small diameter side. It is stuck in. The elastic cup 3 is formed into a frustoconical shape by an elastic body such as rubber. The end surface on the small diameter side is fixed to the plug body 1, and the outer diameter of the end portion on the large diameter side is pumped to be washed. It is formed to have a diameter slightly larger than the inner diameter of the tube 4. A tapered recess 3a is formed in two steps on the end surface on the large diameter side, so that the elastic cup 3 can be easily expanded and contracted in the radial direction.

Next, the operation will be described. When cleaning the inside of the pressure-feeding pipe 4, the plug body 1 is pressed into the pressure-feeding pipe 4 from the waterproof membrane 2 side as shown in FIG. 4, and is not shown in this state. High-pressure water is injected from behind the plug body 1 by a pump. As a result, the water pressure reaching the recessed portion 3a of the elastic cup 3 pushes the elastic cup 3 in the radial direction and presses the outer peripheral surface on the large diameter side against the inner peripheral surface of the pumping pipe 4, so that high-pressure water is plugged. The plug body 1 which does not flow out to the front of the main body 1 and is moved in the pressure feed tube 4 by the high pressure water can clean the pressure-fed object 5 attached to the inner surface of the pressure feed tube 4.

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

[0012]

[Effect of device]

 As described in detail above, the present invention provides an elastic cup at the rear of the plug body that expands in the radial direction by water pressure, and prevents the water pressure from flowing out to the front of the plug body by this elastic cup. Therefore, it is possible to prevent the fine particles of the pumped product from being washed away by the outflowing water. As a result, the product to be pumped is not blocked in the pumping pipe, so that the inside of the pumping pipe can be efficiently cleaned, and more high-pressure water can be pumped into the pumping pipe. Can be washed without.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram showing a usage 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 usage 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 usage state of a cleaning plug according to another embodiment of the present invention.

[Explanation of symbols]

 1 Plug body 2 Waterproof film 3 Elastic cup 4 Pressure feed pipe 5 Pressure feed

Claims (1)

[Scope of utility model registration request] 1. A waterproof film 2 is formed on a front end surface of a cylindrical plug body 1 formed of a porous elastic body, and at the rear end portion of the plug body 1, elasticity that expands radially by water pressure. Cleaning plug for pressure-feeding pipe provided with cup 3.