JPH068101A - Dust collecting duct for cleaning inner surface of steel pipe - Google Patents

Abstract

PURPOSE:To increase the duct collecting capacity of a dust collecting duct and prolong its life by constructing the top end of the dust collecting duct to be connected to a steel pipe with a duplex tube fitted closely to a fixed pipe so that the forward and backward movement of the top of the dust collecting duct can be conducted in the longitudinal direction of the dust collecting duct. CONSTITUTION:A dust collecting duct for steel pipe inner surface cleaning comprises a fixed dust collecting duct 1 and a movable dust collecting duct 2 fitted closely to the top end inner surface of the fixed dust collecting duct 1. Namely, a resin ring guide 3 is positioned at two locations between these ducts 1 and 2 to enable smooth movement of the movable dust collecting duct 2 in longitudinal direction and, outside the guide 3, a seal ring 4 is positioned to prevent collected dust from leaking. Then a rubber end plate 5 with an opening to which the one end of a steel pipe 21 of which inner surface is to be cleaned can be fitted closely is fixed to the top end of the movable duct 2, and the movable dust collecting duct 2 is moved forward and backward along the steel plate 21 in longitudinal direction by a pneumatic or hydraulic cylinder 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust discharged from the inside of a steel pipe, which is connected to the other end of the steel pipe when compressed air is blown from one end of the inner pipe to clean the inner surface of the steel pipe. The present invention relates to a dust collection duct that collects dust and the like.

[0002]

2. Description of the Related Art After polishing or finishing the inner surface of a steel pipe, polishing dust or cutting dust is accumulated on the inner face of the steel pipe. Then, in order to remove these polishing dust and cutting dust, compressed air is blown from one end of the steel pipe after processing, and dust coming out from the other end side of the steel pipe is connected to a dust collecting duct to collect the dust. .

FIG. 2 is an explanatory view showing a method of cleaning the inner surface of the steel pipe described above. One end 2 of the steel pipe 21 whose inner surface is finished is processed.
Compressed air is blown from 1a by the air nozzle 22. Then, at the other end 21b of the steel pipe 21, a movable dust collecting duct 24 that moves forward and backward in the longitudinal direction of the steel pipe 21 by a cylinder 23 is provided.
It is connected so as to wrap with the steel pipe 21 and collects the dust discharged from the inner surface of the steel pipe 21. The collected dust passes from the movable dust collection duct 24 through the rubber hose 25 connected to the movable dust collection duct 24, and is sucked into the fixed dust collection duct 26 connected to the rubber hose 25. In this way, the movable dust collecting duct is used because the length of the steel pipe to be cleaned varies, and the air nozzle 22 is also moved forward and backward to adjust the position. .

[0004]

However, when attempting to collect the dust on the inner surface of the steel pipe using the above-mentioned conventional dust collecting duct, there are the following problems. (1) Due to the bending of the rubber hose, the pressure loss of the collected dust is large and the suction ability is low. (2) Since the metal powder in the collected dust hits the curved portion of the rubber hose, the rubber hose is worn and the life of the rubber hose is short.

The present invention has been made in order to solve the above-mentioned problems of the prior art. For cleaning the inner surface of a steel pipe, which has a large suction capacity because of a small pressure loss and has a long life because a rubber hose is not used. The purpose is to provide a dust collection duct.

[0006]

The dust collecting duct for cleaning the inner surface of a steel pipe according to the present invention is connected to the other end of the steel pipe when the inner surface of the steel pipe is cleaned by blowing compressed air from one end of the inner surface-treated steel pipe. Then, in the dust collecting duct for cleaning the inner surface of the steel pipe for collecting the dust discharged from the steel pipe, the tip of the part of the dust collecting duct connected to the steel pipe shall be a double pipe that fits into the fixed pipe. The tip of the dust collecting duct is configured to be movable forward and backward in the longitudinal direction of the dust collecting duct.

[0007]

The dust collecting duct for cleaning the inner surface of the steel pipe according to the present invention,
Depending on the length of the steel pipe to be cleaned, move the tip of the dust collection duct forward and backward in the longitudinal direction of the steel pipe, wrap the tip of the dust collection duct on the outside of the steel pipe, and collect the dust discharged from the steel pipe. Can be dust. For this reason, the pressure loss of the collected dust is small, and a material that is rapidly worn by metal powder or the like is not used, so that the life of the dust collection duct is extended.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A dust collecting duct for cleaning the inner surface of a steel pipe according to one embodiment of the present invention will be described with reference to the explanatory view of FIG. The dust collecting duct for cleaning the inner surface of the steel pipe according to one embodiment of the present invention is a fixed dust collecting duct 1.
And a movable dust collecting duct 2 fitted on the inner surface of the tip of the fixed dust collecting duct 1. The details of the periphery of the movable dust collection duct 2 are as follows. That is, resin ring-shaped guides 3 are arranged in two places between the movable dust collection duct 2 and the fixed dust collection duct 1 so that the movable dust collection duct 2 can smoothly move forward and backward in the longitudinal direction of the duct. In addition, the seal ring 4 is arranged on the outer side of the guide 3 to prevent the collected dust from leaking. Further, a rubber-made end plate 5 having an opening into which one end of a steel pipe 21 for cleaning the inner surface can be fitted is fixed to the tip portion of the movable dust collecting duct 2. The movable dust collecting duct 2 is a pneumatic or hydraulic cylinder 6 and is adapted to move forward and backward along the longitudinal direction of the steel pipe 21.

When the inner surface of the steel pipe 21 after processing is cleaned by using the dust collecting duct for cleaning the inner surface of the steel pipe according to the one embodiment of the present invention, an air nozzle for cleaning is provided on one end 21a side of the steel pipe 21. Move 22 closer. On the other hand, the other end 2 of the steel pipe 21
On the 1b side, the pneumatic or hydraulic cylinder 6 is operated to move the movable dust collecting duct 2 forward so that the movable dust collecting duct 2 is wrapped around the steel pipe 21. In this state, compressed air is blown into the steel pipe 21 from the air nozzle 22. The machining waste in the steel pipe 21 is blown away by the compressed air, enters the movable dust collecting duct 2 from the other end 21b side of the steel pipe 21, and is further collected to the fixed duct side.

In the dust collecting duct for cleaning the inner surface of the steel pipe of the first embodiment of the present invention, the dust collected on the inner surface of the steel pipe 21 is collected to the fixed duct without receiving any resistance. In addition to being large, the dust collecting duct is not damaged by the collected processing dust, so that the dust collecting duct has a long life.

[0011]

According to the present invention, the dust collecting capability of the dust collecting duct for cleaning the inner surface of the steel pipe is enhanced and the life is extended.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a dust collecting duct for cleaning an inner surface of a steel pipe according to an embodiment of the present invention.

FIG. 2 is an explanatory view of a conventional dust collecting duct for cleaning the inner surface of a steel pipe.

[Explanation of symbols]

 1 Fixed dust collection duct 2 Movable dust collection duct 3 Ring guide 4 Seal ring 5 End plate 6 Pneumatic or hydraulic cylinder

Claims (1)

[Claims] 1. A steel pipe connected to the other end of the steel pipe to collect dust discharged from the steel pipe when compressed air is blown from one end of the inner pipe to clean the inner surface of the steel pipe. In the dust collecting duct for cleaning the inner surface, the tip of the part that connects to the steel pipe of the dust collecting duct is a double pipe that fits into the fixed pipe, and the tip of the dust collecting duct can move forward and backward in the longitudinal direction of the dust collecting duct. A dust collecting duct for cleaning the inner surface of a steel pipe, characterized by being configured as follows.