JPH01239393A - Cleaning device for horizontal type tube - Google Patents

Abstract

PURPOSE:To permit the cleaning of the outer surface of a tube, by a method wherein a cleaning device, equipped with cleaning jigs, such as air chisel, shot blast nozzle and the like capable of moving along the axial direction of the tube, is positioned and fixed at a place corresponding to the tube to be cleaned. CONSTITUTION:Running rollers 5 and guide rollers 7 for an upper traversing unit 3 are mounted on the heat transfer tubes 1 of the uppermost stage while inserting a cleaning device 4 into a gap between a cleaning main body unit 4 and a heat transfer tube 1, then, the running rollers 5 are rotated to move the cleaning device 2 to a predetermined position above the heat transfer tubes 1 and descend the cleaning main body unit 4, hanged by a wire 9, thereafter, the heat transfer tube 1 is detected by a tube detecting sensor 25 and a proximate sensor 26. An air cylinder 27 is operated to fix the cleaning main body unit 4 between pannels by a push plate 24. Compressed air is supplied and a plurality of air chisels 17 of a cleaning jig starts high vibration. The air chisels 17 are arranged in a form to surround the half-round outer periphery of the heat transfer tube 1 whereby the outer periphery of the heat transfer tube 1 may be cleaned.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applied to the pretreatment of non-destructive inspections for measuring the thickness of horizontal tubes such as boiler heat exchanger tubes and investigating metallographic structures. The present invention relates to a surface cleaning device.

[Conventional technology]

In the aging investigation of various plant piping such as boiler tubes, the preparation stage includes measuring the outer diameter and wall thickness, which are indicators of the degree of wear, and detecting flaws such as micro-cracks, including the removal of fixed ash, etc. The surface of the boiler tube is cleaned, and then a non-destructive test such as liquid penetrant testing is performed at the inspection stage.

As shown in FIG. 4, for example, when carrying out dimensional inspections such as the diameter and wall thickness of the outer surface of the boiler heat exchanger tubes 1 made into panels, and structure inspections, the intervals between each panel are narrow.
It is often used to widen the panel spacing using jacks, chain blocks, etc. (not shown) to the extent that workers can perform cleaning, dimensional inspection, etc. between the panels. After that, the worker uses, for example, commercially available Jesoto chisel (trade name),
Generally, a grinder or a hammer is used to remove ash stuck to the outer surface of the boiler tube.

However, at present, almost all of these operations are performed manually, and various inspections using labor-saving automation (remote automation), which have been particularly requested in recent years, have traditionally been carried out manually. Since polishing and inspection were carried out, when inspecting a narrow space where workers cannot access, it is necessary to widen the gap between panels by mechanical means as mentioned above, or cut the panels outside the boiler for inspection. or left unexamined.

However, in the case of the first two, it takes a lot of man-hours and costs,
In the latter case, problems such as reduced lifespan and reliability of various plants such as boilers remained.

At the same time, in recent years, there has been a particular demand for a system that can enter into narrow spaces without scaffolding, that can also remove fixed ash and oxidized scale that adheres to heat transfer tubes, and automate and systemize the cleaning process up to inspection. was developed to solve these conventional problems. That is, the present invention provides a cleaning device for cleaning the outer surface of a horizontally installed pipe, which is disposed in a gap between tubes such as a heat exchanger tube of a horizontally installed boiler and is movable along the tube axis direction and the vertical direction. A cleaning main body that includes a cleaning jig such as a shot blast nozzle, a ball screw and motor for moving the cleaning jig from side to side, a motor for changing the direction of the cleaning jig, and a support plate for supporting these; comprising a winding drum, a winding wire, and a winding motor for raising and lowering the cleaning main body to a desired height; and an upper transverse part having a running roller and a running roller drive motor for moving the cleaning body along the tube axis direction; The cleaning main body is equipped with a sensor that detects the pipe when it is raised and lowered, and a pressing plate that is attached to the cleaning main body via an extendable cylinder.

[Effect]

The present invention is configured as described above, and the main body of the cleaning device can be moved along the tube axis direction to a cleaning location of a horizontal type tube by driving the traveling rollers. Further, the cleaning main body is moved up and down in the vertical direction of the pipe by an elevating drum and an elevating wire provided on the upper transverse part of the cleaning device, and the cleaning main body is positioned at a position corresponding to the pipe to be cleaned.

Then, the extensible cylinder is operated to move the pressing plate, and the pressing plate is brought into pressure contact with another pipe, thereby fixing the cleaning main body.

Once the cleaning main body is fixed in place in this way, the cleaning jig is moved to the position where the cleaning jig is to be cleaned by changing the direction using the motor for changing the direction, and then the ball screw is moved by the motor for moving left and right. By rotating the cleaning jig, the outer surface of the tube is cleaned while moving the cleaning jig along the axial direction of the tube.

When the cleaning main body is fixed in the above manner and cleaning of a predetermined range of pipes is completed, the cylinder is retracted to release the fixation of the cleaning main body by the pressing plate, and the cleaning main body is moved up and down to another pipe. Alternatively, the entire cleaning device is sent in the axial direction of the tube to clean other tubes or other parts of the tube.

In this way, the present invention can automatically clean the outer surface of a horizontal tube.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 is a perspective view showing the entire cleaning device 2 for cleaning the outer surface of the heat exchanger tubes 1 by moving along the axial and vertical directions of horizontal heat exchanger tubes 1 arranged at regular intervals, and FIG. 2 is a front view thereof. , FIG. 3 is a side view thereof. In these drawings, 3 is an upper transverse portion, and 4 is a cleaning main body, which are the main parts of the cleaning device 2 according to this embodiment.

First, the upper transverse portion 3 will be explained. A constricted running roller 5 at the center that moves the cleaning main body 4 (to be described later) along the axial direction of the heat transfer tube 1 and a driving motor 6 for the running roller that drives this running roller 5 enable stable movement in the tube axial direction. A guide roller 7 that moves over the other heat exchanger tube 1 in the tank, and a winding drum 8 for raising and lowering the cleaning main body 4 A winding wire wound around this and one end of which is attached to the cleaning main body 4 9. Arranged so that the winding drum 8 itself moves axially along the slide shaft 10 as it rotates so that the winding wire 9 is always suspended vertically and engages with a gear groove 11 machined in the winding drum 8 in advance. The upper transverse portion 3 is provided with a sliding jig 12 and a winding motor 13 for rotating the winding drum 8.

Since the gap between the heat transfer tubes 1 differs from boiler to boiler, the guide roller 7 has a panel gap adjustment handle 13 and a ball name screw 15 connected thereto so that the gap between the heat transfer tubes 1 and the traveling roller 5 can be adjusted according to the gap. A pawl adjustment mechanism is provided, and by turning the panel spacing adjustment handle 14, the guide roller 7 can be moved onto the adjacent heat exchanger tube 1 along the pawl screw 15 connected to the handle 14. It has become.

In addition, a slide wheel 16 is attached to the upper transverse portion 2 to slide and adjust the hanging fulcrum of the winding wire 9 so that the cleaning main body portion 4 can always be raised and lowered vertically at an optimal position even if the outer diameter of the heat transfer tube 1 is different. The winding wire 9 extends downward through the sliding wheel 16 and is attached to the cleaning main body 4. Next, the cleaning main body part 4 will be explained. The cleaning main body part 4 is equipped with the following items. That is, the cleaning jig support part 3 for moving the cleaning jig 17, such as at least one air chisel, to a predetermined axial range of the heat exchanger tube 1, for example.
The ball screw 18 screwed into the screw hole 0 and the support part 30
A slide shaft 19 that passes through the hole so that it can slide, a moving motor 20 that drives the pole screw 18, and a turning gear 21 that turns the cleaning jig 17 by 90 degrees to the optimal position for cleaning the outer surface of the heat transfer tube 1. A swing motor 22 is provided, and there is a support plate 23 that supports the ball screw 18, slide shaft 19, etc. On both sides of the support plate 23,
A pressing plate 24 for fixing the cleaning main body 4 at the position of the heat exchanger tube 1 to be cleaned, a tube detection sensor 25 for detecting the heat exchanger tube 1, and a proximity sensor 26 for detecting the crown portion of the heat exchanger tube 1 are provided. There is. The illustrated air chisel has a shape that can clean half the circumference of the heat transfer tube, and two cleaning jigs 17 and 17 equipped with such air chisels are provided on both sides of the swing motor 22. ing.

The pressing plate 24 is a panel portion 2 that is identified by the support plate 23 and has a tube detection sensor 25 and a proximity sensor 26 attached thereto.
It is attached to 3゛ via an air cylinder 27,
It can be moved by expanding and contracting the air cylinder 27. For example, when the panel spacing is wide as shown in FIG. The cleaning main body part 4 is fixed in such a way that it is stretched between the two parts.

Note that the cleaning jig 7 is not necessarily limited to the air gun 17, and other tools such as a shot blast (nozzle), a dust brush, a wire brush, etc. may be mounted on the cleaning main body 4. .

As shown in the drawing, when air chisels 17 are used as cleaning jigs, a plurality of air chisels 17 are provided on the two left and right cleaning jigs and arranged half way around the heat exchanger tube 1. The air chisel 17 is vibrated at high speed to clean half of the outer surface of the heat transfer tube 1.

The compressed air to the air cylinder 27 and the air chisel 17 is supplied from a working fluid supply source (not shown). The upper transverse section 3 is also equipped with an encoder 28, which is connected to a controller (not shown). Also 2
Reference numeral 9 denotes a hook that connects the tip of the winding wire 9 and the upper part of the support plate 23 of the cleaning main body 4.

Next, the operation of this embodiment will be explained.

While inserting the cleaning main body part 4 suspended from the tip of the winding wire 9 into the gap of the heat exchanger tube 1, the running roller 5 and guide roller 7 of the upper transverse part 3 are placed on the uppermost heat exchanger tube l. Then, connect the upper horizontal part 3 to the uppermost heat exchanger tube 1 of the horizontal panel.
The cleaning device 2 is moved to a predetermined position on the heat transfer tube 1 by rotating the traveling roller 5 by the traveling motor 6, and then stopped. Next, the winding drum 8 starts rotating, and the cleaning main body 4 suspended from the wire 9 descends. When the heat exchanger tube 1 is detected by the tube detection sensor 25, the descending speed of the cleaning body 4 is decelerated, and then the crown portion of the heat exchanger tube 1 is detected by the proximity sensor 26, and the cleaning body 4 is stopped. At this point, the main body pressing air cylinder 27 is activated.
A pressing plate 24 securely fixes the cleaning main body 4 between the panels. Next, compressed air is supplied from a supply source (not shown),
The plurality of air chisels 17 of the cleaning jig begin to vibrate at high speed. In this state, the two left and right cleaning jigs 17 are rotated by the rotation motor 22.
The heat exchanger tube 1 is rotated by 90 degrees, and the plurality of air chisels 17 respectively surround half the outer periphery of the heat exchanger tube 1, thereby cleaning the outer periphery of the heat exchanger tube 1. In this state, by starting the moving motor 20 and rotating the ball screw 18, the cleaning jig 1
7 reciprocates left and right in the tube axis direction within a predetermined range along the slide shaft 19 to continue cleaning. When this is completed, the cleaning jig 17 turns 90 degrees, returns to its original state and leaves the heat exchanger tube 1, and the supply of compressed air is also stopped. Thereafter, the air cylinder 27 for pressing the main body is also released, the pressing plate 24 is also released from the tensioned state, and the cleaning main body 4 becomes free. In this state, the winding drum 8 is rotated to move the cleaning main body 4 downward toward all other cleaning heat transfer tubes.

By automatically repeating the above series of movements, each heat transfer tube 1 is cleaned one after another from the upper stage to the lower stage of the panel. When the panel reaches the lowest level, the tube detection sensor 25 confirms that there is no heat exchanger tube 1 under it, and the cleaning main body 4 returns to the highest level. Next, after being automatically moved along the heat exchanger tube 1 by a preset moving distance by the running rollers 5, it starts descending for cleaning.

Cleaning is completed by automatically repeating the above movements.

Note that the above cleaning was performed only around half the circumference of the pipe.

After this, the cleaning main body section 4 is attached to the hook 29 from the upper transverse section 3.
After removing it from the tube and reversing its hanging position, attach it to the upper transverse part 3 again, and perform the same operation as above while returning to the opposite direction of the tube axis. Finally, the entire heat exchanger tube 1 is It is possible to clean the surrounding area.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to move the cleaning device in the axial direction of tubes such as horizontal boiler heat exchanger tubes, and to move the cleaning main body up and down in the tube vertical direction. The outer surface of the heat transfer tube can be cleaned automatically and remotely. Further, when the cleaning jig is cleaning, the cleaning main body is securely fixed by the pressing plate, making it possible to perform the cleaning operation reliably.

As described above, according to the present invention, it is not necessary to mechanically open a narrow panel, have a worker enter the inside, and manually polish the panel using a jet chisel or a grinder. can be done automatically and efficiently. Furthermore, it is possible to thoroughly and accurately clean the outer surface of the pipe in areas that were previously impossible to clean. Therefore, it is possible to reliably greatly save labor and reduce the number of man-hours required for cleaning the outer surface of the pipe.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the entire embodiment of the present invention, Fig. 2 is a front view thereof, Fig. 3 is a side view thereof, and Fig. 4 is a conventional manual cleaning or inspection of a horizontal heat exchanger tube. FIG. DESCRIPTION OF SYMBOLS 1... Heat exchanger tube, 2... Cleaning device, 3... Upper transverse part, 4... Cleaning main body part, 5... Running roller, 6... Running roller drive motor, 7... Guide roller, 8... Winding drum, 9
... Winding wire, 13... Winding motor, 1
7...Air chisel, 18...Ball screw, 19
...Slide axis, 20...Movement motor, 21.
...Swivel tooth top, 22...Swivel motor, 23...Support plate, 24...Press plate of cleaning main body, 25...Pipe detection sensor, 26...Proximity sensor, 27... air cylinder. Agent: Patent attorney Akira Sakama and 2 others A9K-F13Oka

Claims (1)

[Claims] A cleaning main body having a cleaning jig for the outer surface of the tube, a ball screw and a motor that moves the cleaning jig from side to side, a motor that changes the direction of the cleaning jig, and a support plate that supports these; and the cleaning main body. A winding drum, a winding wire, a winding motor, and an upper transverse part each having a winding drum for raising and lowering the winding section to a desired height, a running roller that moves along the tube axis direction, and a driving motor for the running roller, and the above-mentioned cleaning A horizontal type pipe cleaning device characterized in that the main body is equipped with a sensor that detects the pipe when the main body moves up and down, and a pressing plate attached to the cleaning main body via an extendable cylinder.