JPH0327273B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a small diameter pipe inner surface coating apparatus.

Plumbing work for laying water pipes, sewage pipes, sea water pipes, etc. was done by welding together single pipes whose insides had been painted in advance at the factory. After welding, when applying anti-corrosion coating to the inner surface of the joint of welded pipes and the surrounding area, residual welding slag, rust, etc. must be cleaned and removed. However, in the case of small-diameter pipes with a diameter of 600 mm or less, especially 125 mm or less, a person must enter the pipe to clean it.
The aforementioned anti-corrosion coating was not possible due to the difficulty of removal.

Therefore, in order to apply anti-corrosion coating to the inner surface of small diameter pipes,
As a conventional coating device, a coating device disclosed in Utility Model Application No. 166863/1983 (see Japanese Utility Model Application No. 93066/1983) has come to be provided. This coating apparatus is shown in FIGS. 1 and 2. FIG. 1 shows the case where this coating apparatus is used for polishing and dust collection work, and FIG. 2 shows the case where this coating apparatus is used for painting work.

In FIG. 1, 101 is the main body. Main body 1
An air motor 102 is housed inside the air motor 101, and a wire brush 103 is detachably attached to the tip of the air motor 102. Six support arms 104 are detachably attached around the main body 101, and rollers 105 are provided at the tips of the support arms 104. A dust collector 1 is installed at the rear end of the main body 101.
06 is connected. An introduction pipe 107 can be connected to the rear end of the dust collector 106. Note that in order to introduce the main body 101 into the pipe, the introduction pipe 107 can be added.

2 shows a coating pulley 108 attached to the tip of the main body 101 instead of the wire brush 103 shown in FIG. 1, and a main body 10 instead of the dust collector 106.
A coating machine 109 is connected to the rear end of 1.
In FIG. 2, the same reference numerals as in FIG. 1 indicate the same components as in FIG.

The conventional coating apparatus described above performs operations in the following order.

First, perform polishing and dust collection work.

The polishing work is performed by inserting the conventional coating device shown in FIG.
This is done by activating 6. When performing polishing and dust collection work, if the pipe into which the conventional coating device is inserted is long, an introduction pipe 107 is added.

Next, do the painting work.

Painting work is done after polishing and dust collection work. The painting operation is carried out by inserting a conventional painting device shown in FIG.
Note that when performing painting work, if the pipe into which the conventional painting device is inserted is long, an introduction pipe 107 is added as in the case of the polishing and dust collection work described above.

However, when detecting the coating position inside the pipe, conventional coating apparatuses have the disadvantage that the detection accuracy of the coating position is poor because the determination is made based on the distance that the introduction pipe is inserted into the pipe. In addition, conventional coating equipment requires adding an inlet pipe when the tube is long, so the longer the inlet pipe becomes, the more it bends, and the distance that the inlet pipe can be inserted into the pipe is severely restricted, resulting in disadvantages such as the inability to paint long tubes. had.

The present invention eliminates the above-mentioned drawbacks of the conventional methods, allows accurate detection of the coating position on the inner surface of a small-diameter pipe, enables painting of the inside of a long pipe, and quickly and remotely controls the coating from outside the pipe. The object of the present invention is to provide a small-diameter pipe inner surface coating device that can coat the inner surface of a small diameter pipe.

That is, the present invention provides a painting apparatus in which a traveling carriage, a position oscillation carriage, an intra-pipe moving device, a cleaning device, and an introduction pipe are connected in a line in this order, and the traveling carriage has a rotatable wire brush or a polishing wire brush or the like at its tip. A driving machine equipped with an impeller for painting is mounted, and the pipe moving device is equipped with a screw shaft rotated by the driving machine, and a slide shaft screwed into the screw shaft and capable of moving forward and backward. The cleaning device is a small-diameter pipe inner surface coating device characterized by having an air inlet into which compressed air flows, and an air blow port through which the compressed air flowing in from the air inlet flows out backward.

Embodiments of the present invention will be described below based on the drawings.

FIG. 3 and FIG. 4 show a first embodiment of the schematic structure of a small diameter pipe inner surface coating apparatus according to the present invention. The coating device includes a traveling truck 1, a position oscillating truck 11, an intra-tube moving device 18, a cleaning device 29, and an introduction pipe 31, which are connected in a line in this order.

A grinder 39 is mounted on the traveling truck 1.
The cleaning machine 39 has a retaining disc 9 of piano wire 10, which serves as a wire brush, firmly attached to the tip of the motor shaft 7 of the air motor 4 with a nut 8. When the air motor 4 rotates at high speed, the holding disk 9 also rotates at high speed at the same time. The cleaning machine 39 is mounted on the traveling carriage 1 by fixing the air motor 4 to the screw 5 of the fixing band 6. The traveling vehicle 1 is supported by conductive front wheel traveling rollers 3 and non-conductive rear wheel traveling rollers 2 made of synthetic resin, which determine the height and traveling method of the traveling vehicle 1.

The position oscillation truck 11 is connected to the rear of the traveling truck 1 using a connecting screw 23. Radioisotope 12 is mounted using mounting screws 13. The position oscillation truck 11 is supported by a non-conductive front wheel running roller 14 and a similarly non-conductive rear wheel running roller 15.

The intra-tube moving device 18 is supported by a non-conductive front wheel running roller 26 and a similarly non-conductive rear wheel running roller 27, and is connected to the rear part of the position oscillation truck 11. The connection is made at the tip of the slide shaft 19 via a connecting nut 17 and a fixing screw 16.
The intra-tube moving device 18 has a slide shaft 19 that moves back and forth, and this movement causes the position oscillation cart 11 and the traveling cart 1 to move back and forth. This forward and backward movement distance is only the length of the forward and backward movement of the slide shaft 19. The structure for moving the slide shaft 19 back and forth is shown in FIG. In FIG. 5, a screw shaft 22 is directly connected to the motor shaft of a built-in motor 21, and a slide shaft 19 is screwed to the screw shaft 22 that is directly connected. Therefore, the rotation of the screw shaft 22 causes the slide shaft 19 to move back and forth. In addition, in FIG. 5, 24 is a casing. Further, in FIGS. 3 and 4, 20 is a motor cover that covers the built-in motor 21, and 33 is a control cable.

The cleaning device 29 is connected to the rear of the intraductal moving device 18 using a joining screw 28. 34 is a cleaning air hose. Details of the main parts of the cleaning device 29 can be found in Part 6.
As shown in the figure. In FIG. 6, the cleaning device 29
has an air socket 38 for connecting the cleaning air hose 34 and an air blow port 56 for blowing compressed air entering from the air socket 38.
The installation direction of the air blow port 56 is toward the rear of the cleaning device;
That is, the direction is opposite to the direction of the intraductal moving device 18.

The introduction pipe 31 is connected to the rear part of the cleaning device 29 via a one-touch joint 30.

FIGS. 7 and 8 show a traveling cart 1 equipped with a coating machine 40 instead of the cleaning machine 39 shown in FIGS. 3 and 4. FIG. The paint sprayer 40 has an impeller 37 attached to the tip of the motor shaft of the air motor 4. When the air motor 4 rotates at high speed with compressed air supplied from the air hose 32, the impeller 3
7 also rotates at high speed at the same time. While the impeller 37 is rotating at high speed, when the paint that is force-fed from the paint hose 35 is dripped into the inside of the impeller 37, the rotational movement of the impeller 37 knocks down the paint and atomizes it so that it can be painted. become. In addition, the seventh
Among the reference numerals shown in FIGS. 3 and 8, the reference numerals shown in FIGS. 3 and 4 refer to the same reference numerals as those shown in FIGS.

Next, the cleaning work and painting work will be explained.
When performing sanding work and painting work, it is necessary to detect the position where these works will be performed in advance. Detection of this position will be explained with reference to FIG. 9. First, if B ₁ is the welded part of the pipe where the cleaning or painting work is to be performed, the detector 58 is placed directly above the pipe body B ₂ a certain distance L away from B ₁ , and the detector 58 and the display 59 are connected by a joint cable 47.

Next, when the coating device is inserted into the pipe through the introduction pipe 31, the radioisotope 12 mounted on the position oscillation cart 11 is also inserted into the pipe. As the radioisotope 12 approaches the detector 58, the detector single lamp 48 begins blinking. When the radioisotope 12 reaches the bottom of the detector 58, the detector 58 reaches its highest sensitivity and the detector signal lamp 48 lights up continuously. However, when the radioisotope 12 moves away from the detector 58, the detector signal lamp 12 blinks.
Eventually it disappears. The above method of detecting the position can be used when the detector 58 can be placed stationary on the outer surface of the exposed pipe, but it cannot be used in the case of non-exposed pipes such as buried pipes that have already been buried. It disappears.

Therefore, a method for detecting the position of non-exposed pipes such as buried pipes will be described next.

This detection method is based on the fact that the coating film of the single tube, which has been painted inside in advance at the factory, is non-conductive, and that only the front wheel traveling roller 3 of the traveling bogie 1 is conductive, while the rear wheels of the other traveling bogie 1 are conductive. Roller 2, position oscillation trolley 11
This utilizes the fact that the front wheel running roller 14 of the oscillator truck 11, the rear wheel running roller 15 of the position oscillation cart 11, the front wheel running roller 26 of the intra-tube moving device 18, and the rear wheel running roller 27 of the intra-tube moving device 18 are non-conductive. be.

In order to detect the position, a conductor is inserted into the outer sheath of the air hose 32 that extends from the air hose reel 60 to the air motor 4 of the traveling truck 1, and a conductor is connected between the coating device and the air hose reel 60, and the end of the pipe is connected to the air hose reel 60. A circuit is formed by connecting the DC or low frequency AC power supply device 53 with a pilot lamp and the DC or low frequency AC power supply device 53 with a pilot lamp and the air hose reel 60, respectively.

When the front wheel running rollers 3 of the traveling trolley 1 are running on the painted film of the piping, since the painted film of the piping is non-conductive, the circuit created by the above-mentioned wiring does not become a closed circuit. , the pilot lamp 50 does not light up. However, the front wheel traveling roller 3 of the traveling trolley 1
When the weld reaches the welded part of the pipe where the coating has been removed by welding, the circuit created by the above-mentioned connection becomes a closed circuit, and the pilot lamp 50 lights up. By lighting the pilot lamp 50, it becomes possible to detect the welded portion of the pipe.

Next, the cleaning operation will be explained with reference to FIG. 9.

After detecting the position where the cleaning work is to be performed, the cleaning work is started. Compressed air is supplied from an air hose 32 to an air motor 4 of a grinding machine 39 mounted on a traveling truck 1, and the air motor 4 is rotated at high speed. The twisted piano wire 10 attached to the holding disc 9 is rotated at high speed by the high speed rotation of the air motor 4, and the welded portion of the pipe is polished. Welding slag, rust, etc. are removed by this polishing. Thereafter, the removed welding slag, welding slag, etc. are blown away toward the tube end by air discharged from the air blow port 54 of the cleaning device 29, and are discharged outside the tube. Note that 62 is Kopretusa, and 63 is 1
Next is an air hose, 64 is an air control box, and 65 is a lever.

Next, the painting operation will be explained with reference to FIG. 9.

After the cleaning work, in preparation for the painting work, the holding disc 9 attached to the tip of the motor shaft 7 of the air motor 4 is removed, and the impeller 37 is attached to the tip of the motor shaft 7 of the air motor 4. The paint hose 35 is fixed to the air motor 4 so that the tip of the paint hose 35 is located inside the impeller 37. The other end of the paint hose 35 is connected to a paint pressure pump 61 via a paint hose reel 54. Intraduct moving device 18
A control cable 33 is connected to the generator 66 via a control drum 68 and a control box 67. Press the forward button on control box 67,
The slide shaft 19 of the intra-tube moving device 18 is pushed forward as much as possible, that is, in the direction of the impeller 37.

After completion of such preparation, the position where the painting work is to be performed is detected. After the position is detected, compressed air is supplied from the air hose 32 to the air motor 4, and by rotating the air motor at high speed, the impeller 37 is also rotated at high speed. Paint lever 69 of paint pressure pump 61
is opened, and the paint pressurized by the paint pressure pump 61 is dripped into the interior of the impeller 37 which is rotating at high speed. The paint is beaten by the blades of the impeller 37, becomes fine, and is coated all around the inner wall of the pipe. In this case, when the backward button of the control box 67 is pressed, the slide shaft 19 of the intra-tube moving device 18 moves backward, that is, when the impeller 37
Since the impeller 37 moves at a constant speed in a direction opposite to a certain direction, the impeller 37 also moves backward at the same speed. Therefore, the welded part and its vicinity are uniformly coated. The painting work is completed by performing such painting work on all the welded parts of the piping.

By the way, FIG. 10 shows a second embodiment of the present invention. In the figure, the traveling trolley 1 has a supporting metal fitting 4 that slides while closely contacting the outer surface of the air motor 4.
4 is attached with an adjustable diameter roller 3a using a link mechanism, and the adjustment coupling 45 screwed onto the end of a support fitting 44 is used to enlarge or reduce the diameter adjustable roller 3a.
Adjust by turning the lock nut 4 after adjustment.
Fix it at 6. Further, the front wheel running roller 14a, the rear wheel running roller 15a of the position oscillation trolley 11, the front wheel running roller 26a, and the rear wheel running roller 27a of the intra-tube moving device 18 are of a diameter-adjustable type using a link mechanism,
The diameter can be adjusted freely. Note that the second embodiment of the present invention shown in No. 10 is applied to a pipe having a diameter of 80 mm or more. Further, among the symbols shown in FIG. 10, the same ones as those in FIGS. 3 and 4 are the same as those in FIGS. 3 and 4, and a description thereof will be omitted.

The present invention has the following effects.

In the present invention, since the traveling carriage is equipped with a drive machine equipped with a rotatable wire brush for polishing or an impeller for painting at the tip, polishing and painting operations can be performed.

In the present invention, since the position oscillation cart is equipped with a radio isotope, it is possible to detect the position of polishing and painting operations even on small diameter pipes such as 50 mm, and the aforementioned polishing and painting operations can be performed even on small diameter pipes. become.

In the present invention, since the intra-tube moving device includes a screw shaft rotated by a drive machine and a slide shaft that is screwed into the screw shaft and can move forward and backward, the slide shaft is moved by the rotation of the screw shaft. When moving back and forth, the impeller for painting also moves back and forth accordingly, so the welded portion of the pipe and its vicinity can be uniformly coated.

In the present invention, since the cleaning device is equipped with an air inlet through which compressed air flows in and an air blow port through which the compressed air flowing in from the air inlet flows out backward, the cleaning device can be cleaned by polishing the welded portion of the piping. The removed welding slag, rust, etc. are blown away toward the end of the tube by the compressed air discharged from the air blow port, and are discharged outside the tube, making cleaning work possible.

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory diagrams showing the configuration of a conventional coating device. Figures 3 to 8 are the first diagrams of the present invention.
3 is a plan view when performing cleaning work, FIG. 4 is a front view when performing cleaning work, FIG. 5 is a detailed view of the main parts of the pipe moving device, and FIG. The figure is a detailed view of the main parts of the cleaning device, FIG. 7 is a plan view when performing painting work, and FIG. 8 is a front view when performing painting work. FIG. 9 is an explanatory diagram showing the case where the first embodiment of the present invention is used. FIG. 10 is an explanatory diagram showing a second embodiment of the present invention. 1... Traveling trolley, 4... Air motor, 10...
Piano wire, 11...Position oscillation trolley, 12...
Radioisotope, 18...Intraduct transfer device, 1
9...Slide axis, 21...Built-in motor, 22...
...Screw shaft, 29...Cleaning device, 31...Introduction pipe, 38...Air socket, 56...Air blow port.

Claims (1)

[Scope of Claims] 1. A painting device in which a traveling truck, a position oscillation truck, an intra-pipe moving device, a cleaning device, and an introduction pipe are connected in a line in this order, wherein the traveling truck has a rotatable wire brush for polishing at its tip. or a drive machine equipped with an impeller for painting, the position oscillation cart is equipped with a radio isotope, and the intra-pipe moving device has a screw shaft rotated by the drive machine, and the screw shaft is screwed to the screw shaft. The cleaning device has a slide shaft that can freely move forward and backward, and the cleaning device includes an air socket into which compressed air flows, and an air blow port through which the compressed air flowing from the air socket flows out rearward. Equipment for painting the inside of small diameter pipes.