JPS6126470B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an internal surface cleaning device for cleaning the internal surface of a hole in a steel pipe or the like.

The present applicant previously installed a rotating nozzle 20 in a traveling vehicle 7 self-propelled in a pipe shown in FIG.
proposed a cleaning device that would clean the inner surface of a tube while injecting sand air (Utility Model Publication No. 56-36616).

The above-mentioned cleaning device has the advantage of improved cleaning efficiency and uniform cleaning compared to a device that removes rust and other deposits from the inner surface of the tube by rotating a wire brush inside the tube.

However, since it takes time and effort to recover the abrasive sand sprayed from the nozzle, and it is difficult to completely recover the abrasive sand, there are problems in that it cannot be used for cleaning transport pipes, especially in the drinking water and food industries. .

In view of the above-mentioned circumstances, the present invention surrounds the injection nozzle 23 with a suction nozzle 5 with sufficient margin, and the suction nozzle 5 immediately collects the abrasive sand that is injected from the injection nozzle 23 onto the inner surface of the pipe and rebounds. An object of the present invention is to provide a device for polishing the inner surface of a tube, which collects the sand and leaves no abrasive sand in the tube. The present invention further provides a method for sanding by directing the injection nozzle 23 in a direction perpendicular to the axis of the pipe to be cleaned and by forming an annular suction passage 8 between the outer periphery of the injection nozzle 23 and the suction nozzle 5. Air is injected from a direction perpendicular to the surface to be polished, and the reflected sand air is drawn into the annular suction passage 8.
The present invention discloses a pipe inner surface polishing device that effectively sucks the abrasive material from the surface of the pipe and prevents the abrasive material from escaping from the seal member 51 provided at the tip of the suction nozzle 5.

The present invention will be specifically described below based on embodiments shown in the drawings.

The frame 1 of the grinding device has a gear box 14 protruding from the tip of a base tube 11, and a support leg 13 having a wheel 12 at its tip protrudes from the base tube 11 at right angles to the tube. . A sand air supply hose 6 is connected to the base end of the base pipe 11, and an injection pipe 2 is provided at the tip of the base pipe 11 via a swivel (not shown) so as to freely rotate against each other.

The injection tube 2 connects the base end of the injection tube main body 22 whose tip is closed to the drive tube 21 which is connected to the substrate 11 so as to rotate freely butt, and injects the injection tube perpendicularly to the tube axis on the distal end side of the main body 22. It is formed with a nozzle 23 protruding from it.

The injection nozzle 23 has a nozzle main body 24 screwed onto the injection pipe main body 22, and a cylindrical nozzle auxiliary body 25 made of an elastic material protrudingly provided thereon.

The nozzle auxiliary body 25 is made of resin with excellent wear resistance, and is gradually enlarged at the tip side.

Inside the gear box 14, two large and small gears 31 and 32 that mesh with each other are provided.
1 is fitted and fixed on the outer periphery of the drive tube 21, and the small gear 32 is linked to a rotary drive device such as an air motor 3 disposed on the gear box 14.

A short pipe 18 with a flange that freely supports the drive pipe 21 is protruded from the front surface of the gear box 14, and the proximal end of the injection pipe main body 22 is connected to the flange 19 of the short pipe 18 with a sufficient clearance. A suction housing 4 with a surrounding front opening is fixed.

A connection port 41 is formed on the circumferential surface of the suction casing 4, and a suction hose 61 is connected to the connection port 41.

A suction nozzle 5 that surrounds the tip of the injection pipe 2 including the injection nozzle 23 with a sufficient margin is provided on the opening surface of the suction housing 4.

The suction nozzle 5 includes a cylindrical body 52 whose surface facing the suction casing 4 is open and whose distal end surface is closed and surrounds the injection tube body 22. The cylindrical body 52 is provided protruding from the circumferential surface of the cylindrical body 52 and surrounds the injection nozzle 23. A gland packing 5 is provided between the cylindrical body 52 and the suction housing 4.
4 etc. to create airtightness or to leave a small gap.

A sealing member 51 is provided at the tip of the nozzle tube 53, protruding outward from the tip of the injection nozzle 23 and slidingly contacting the inner surface of the tube to be cleaned.

The sealing member 51 of the embodiment is formed by densely planting brush bristles 55 over the entire circumference of the tip of the nozzle pipe 53.

By surrounding the injection nozzle 23 with the suction nozzle 5 with sufficient margin as described above, both nozzles 2
A suction passage 8 communicating with the suction hose 61 is formed on the outside of the injection pipe 2 by an annular structure between the suction pipes 3 and 5 .

A suction nozzle 5 is provided at the center of the tip of the injection tube main body 22.
A support shaft 26 protrudes through the cylindrical body 52, and the shaft 26 and the cylindrical body 52 are fixed with a key 56.
The injection pipe 2 and the suction nozzle 5 rotate together.

A support plate 27 is attached to the support shaft 26 via bearing blocks 17, 17 so as to be freely rotatable regardless of the rotation of the shaft 26, and the support plate 27 has legs 16 with wheels 15 at their tips arranged at equal intervals. The pipe protrudes in the radial direction and is supported by the inner wall of the pipe.

A self-propelled vehicle 7 is connected to the above-mentioned cleaning machine to move it forward or backward.

The self-propelled vehicle 7 includes wheels 72 that rotate forward or backward by an air motor 73, and is connected to the frame 1 of the cleaning machine by a connecting rod 75.

An exhaust port (not shown) of the air motor 73 of the self-propelled vehicle 7 is connected to the air motor 3 for rotating the nozzle through a hose 33, and the nozzle is rotationally driven by the exhaust pressure of the air motor 73 of the self-propelled vehicle 7. be done.

However, the cleaning device is put into the pipe 9 to be polished,
First, a suction force is applied to the suction hose 61 by rotating the nozzle while traveling at a low speed. Next, while driving the traveling air motor 73 and the nozzle rotation air motor 3, sand air containing a mixture of sand and compressed air is supplied from the sand air supply hose 6 and is injected from the injection nozzle 23 onto the inner surface of the pipe 9.

The suction pressure acting on the suction hose 61 is about two to three times greater than the injection pressure from the injection nozzle 23.

The jetted abrasive sand immediately passes through the suction passage 8 between the jet nozzle 23 and the suction nozzle 5 and is collected by the suction hose 61 into an external collection tank (not shown).

The suction pressure of the suction nozzle 5 is greater than the injection pressure of the injection nozzle 23, and since the sand air is injected from a direction perpendicular to the surface to be polished, the sand air spreads in a conical shape and hits the surface to be polished and is reflected. However, since the reflection angle is deep (nearly perpendicular to the surface to be polished), the abrasive material does not directly hit the seal member 51 and its vicinity, and the abrasive material scatters to the outside from the gap in the seal member 51. Also, no sand is left in the pipe.

Even if there is a small gap 42 between the suction housing 4 and the suction nozzle 5, the suction pressure of the suction hose 61 causes the outside air to be sucked into the suction hose 61 from the gap, so the gap gets clogged with abrasive sand and rotates. It will not be a hindrance.

By running the cleaning device to the end of the tube, the inner surface of the tube can be cleaned uniformly and efficiently.

In the present invention, as described above, the injection nozzle 23 is surrounded by the suction nozzle 5, and the suction passage 8 is formed between both nozzles 23 and 5, so that the abrasive particles that are injected from the injection nozzle 23, collide with the inner surface of the tube, and bounce back. The sand is immediately sucked and collected through the suction passage 8, so that no sand is left behind in the tube. Therefore, it has many excellent effects, such as being able to be used for cleaning the inner surfaces of pipes such as food transfer pipes and water pipes.

[Brief explanation of the drawing]

Figure 1 is a front view of the cleaning device, Figure 2 is a sectional view of the main parts of the cleaning device, Figure 3 is a side view of the cleaning device, and Figure 4 is a side view of the cleaning device.
The figure is a front view of a conventional example. 1... Frame, 2... Injection pipe, 23... Injection nozzle, 5... Suction nozzle.

Claims (1)

[Claims] 1 Base pipe 1 to which the sand air supply hose 6 is connected
1 and wheels 12, and a base pipe 11.
a rotary injection tube 2 which is rotatably attached to the tip thereof and has an injection nozzle 23 protruding in the radial direction; a rotary drive device which is disposed on the frame 1 and drives the injection tube 2;
a suction housing 4 that surrounds the injection pipe 2 with a space between it and the injection pipe 2 and is provided with a connection port 41 for connecting the suction hose; and an injection nozzle that protrudes from the suction housing 4 to surround the injection nozzle 23. An annular suction passage 8 communicating with the suction casing 4 is formed between the suction nozzle 5 and the suction nozzle 5, which has a sealing member 51 in contact with the inner surface of the tube to be polished. Sweeping device. 2. The pipe inner surface cleaning device according to claim 1, wherein the sealing member 51 is formed by densely planting brush bristles 55.