JPH0638039B2 - Cleaning device for outer surface of heat transfer tube - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cleaning of the outer surface of a heat transfer tube such as a boiler, which is applied to a pretreatment of a non-destructive inspection performed on a size and a structure of a horizontal heat transfer tube. Regarding the device.

Conventional technology For aged inspection of various blunt pipes such as boiler tubes, in order to measure the outer diameter and wall thickness that are indicators of wear and to find scratches such as microcracks, in the preparation stage, for example, removal of adhered ash, etc. The boiler tube surface is cleaned and nondestructive inspection such as liquid penetrant inspection is performed at the inspection stage.

Then, as shown in FIG. 8, for example, when carrying out a dimensional inspection such as the diameter and wall thickness of the outer surface of a panelized boiler heat transfer tube, a structure inspection, etc., each panel interval is narrow, so It is often the case that a worker uses a jack, a chain block or the like (not shown) to widen the panel interval to a range where a worker can perform work such as cleaning and dimension inspection between the panels. After that, the worker generally uses a commercially available jet chisel (trade name), a grinder, or a one-handed hammer to remove the ash adhered to the outer surface of the boiler tube.

However, under the present circumstances, almost all of these operations are performed manually, and various inspections by labor-saving automation (remote), which have been particularly demanded in recent years, have hardly been performed in the past.

Problems to be Solved by the Invention Since the outer surface of the heat transfer tube has been manually polished and inspected by hand until now, when inspecting a narrow place where workers cannot approach, the interval between the panels is set to the mechanical level as described above. It was either expanded by means, the panel was cut out of the boiler furnace and inspected, or left uninspected.

However, in the former two cases, a lot of man-hours and costs are required, and in the latter case, there remains a problem that the life and reliability of various plants such as a boiler are reduced.

At the same time, in recent years, especially in the narrow space without scaffolding,
In addition, it has been required to remove the adhered ash and oxide scale adhering to the heat transfer tube and automate the cleaning process up to the inspection to make it a device.

Means for Solving Problems In order to solve such conventional problems, the present invention provides
A cleaning device for an outer surface of a heat transfer tube, which is arranged in a gap between heat transfer tubes of a horizontal boiler or the like and is movable along the axial direction and the vertical direction of the heat transfer tube. A main body part which is provided with a jig ball screw for raising and lowering to a height and a jig motor, and which has upper and lower support plates for supporting the jig ball screw and pillars arranged at four corners of these support plates. And a traveling roller and a traveling roller motor for moving the main body along the axial direction of the heat transfer tube, and a plurality of guide rollers and a guide roller cylinder that guide the upper surface of the heat transfer tube and can be opened and closed. It is composed of a pair of arms and two drive parts having a support frame for supporting these arms, and one end of the support frame of these drive parts is slidable in the front and rear of the body part through the pillar. Installation, In addition, a pair of lifting ball screws and lifting motors are provided in front and rear of the main body part so that the main body part and the driving part move up and down relatively. While being connected, a plurality of claws for holding the main body part and the drive part that are hooked on the adjacent left and right heat transfer tubes and integrated therewith and a claw cylinder for changing the direction of these claws are provided while being connected, On the side of the drive unit, an arm cylinder for connecting the arms so as to be opened and closed in the horizontal direction via a link is attached to each of the support frames.

By such means, the main body of the cleaning device can be moved to the cleaning position of the horizontal heat transfer tube along the tube axis direction by driving the traveling rollers, and the lifting ball screw provided in the main body can be used. The heat transfer tube can be moved up and down in the vertical direction, and the device can also be moved up and down in the vertical direction of the tube by the combination of holding the device to the heat transfer tube by the claws provided on the main body part and the relative elevation of the main body part and the drive part. be able to.

Embodiment An embodiment according to the present invention will be described in detail below with reference to FIGS.

Thus, FIG. 1 is a perspective view showing a cleaning device 2 for the outer surface of the heat transfer tube 1 that moves along the axial direction and the vertical direction of the horizontal heat transfer tube 1 arranged at regular intervals, and FIG. 2 is a front view thereof. 3 and 4 are side views thereof and FIG. 5 is a plan view thereof. In these drawings, 3 is a main body part and 4 is two drive parts of the same type. Is the main part of.

First, for the former main body 3, for example, a jig ball screw 6 for elevating and lowering at least one cleaning jig such as at least one blast shot nozzle 5 and a jig for rotating (driving) the ball screw. Motors 7 are provided near the center and the bottom of the main body 3, respectively, and support plates 8 for supporting the jig ball screw and pillars 9 arranged at the four corners of these support plates, respectively. The outline is made in.

In this case, the cleaning jig 5 is not necessarily limited to the shot blast (nozzle) 5, but other than this, for example, the jet chisel, grinder, wire brush or the like as described above may be mounted on the main body 3. .

Then, as shown in FIGS. 6 and 7, when the shot blast nozzle 5 is used as the cleaning jig, the pair of shot blast nozzles 5 facing in opposite directions sandwich the jig ball screw 6. Mounted in the main body 3.

This shot blast nozzle is provided with a guide wheel 10, and this guide wheel 10 moves along a groove 12 that has been machined in the side plate 11 in advance.

Next, with respect to the two drive parts 4, the traveling roller 13 (see FIGS. 1 to 5) in the central portion, which moves the main body 3 along the axial direction (the gap portion) of the heat transfer tube 1, and this traveling A roller motor 14 that drives the rollers, a plurality of guide rollers 15 that guide the heat transfer tube 1 and that can be opened and closed, and a set of arms 17 that integrates the roller cylinders 16 and these arms are supported. A support frame 18 is provided.

In this plurality of guide rollers, it is preferable to provide a pair of heat transfer tubes so as to sandwich the heat transfer tubes vertically, and further provide these to each of the left and right arms 17. The guide roller cylinder 16 changes the direction of these guide rollers from the storage position in the drive unit 4 to the left and right arms 17 to the vertical position on the heat transfer tube 1 side.

Under the respective configurations of the main body portion 3 and the drive portion 4, one end portion of the support frame 18 of the drive portion 4 is slidably attached to the front and rear of the main body portion 3 side via the pillar 9. In addition, a set of lifting ball screws 19 and respective lifting motors 20 for driving the ball screws are installed on the outside of the side plate 11 so that the main body part 3 and the driving part 4 move up and down relatively. It is provided on the bottom.

Each drive unit 4 is connected to each of these lifting ball screws via a slider 21.

At the same time, the main body part 3 is hooked onto the adjacent heat transfer tubes 1 on the left and right during the ascending / descending operation to hold the cleaning device 2 as a whole, that is, a plurality of integrated main body parts 3 and drive parts 4 (preferably two sets). A substantially L-shaped claw 22 and a claw cylinder 23 for diverting the claws 22 in opposite directions from the storage position in the main body 1 to above the heat transfer tube 1 by about 90 °. , Provided on the top and top of the main body 3.

On the other hand, on the side of the drive unit 4, an arm cylinder 25 is attached to the end of the support frame 18, which is connected to the arms 17 and horizontally connects the arms via a link 24 so that the arms can be opened and closed. Each cylinder 16, 23 and 25 is connected to a working fluid supply means such as air or oil which is not shown in the drawing, while each motor 7, 14, 20 is also shown in the drawing. Not connected to the controller.

Next, the operation will be described.

(1) At the stage of arranging the cleaning device 2 on the heat transfer tube 1 as described above, the claw 22 on the main body 3 side stops the rotation of the claw motor 23 by the control device.
It remains stored inside.

Similarly, the guide roller 15 and the arm on the drive unit 4 side
Each of the 17 rollers is kept housed in the drive section 4 by adjusting the working fluid of the guide roller cylinder 16 and the arm cylinder 25.

Therefore, the cleaning device 2 can be inserted into the gap of the heat transfer tube 1 at an arbitrary position (of course, as close to the cleaning position as possible).

(2) As shown in FIGS. 3 to 5, the arm 17 housed in the drive unit 4 after being inserted into the gap is actuated by the arm cylinder 25 so as to be adjacent to each other via the link 24. To the heat transfer tubes 1, and when the traveling rollers 13 are pressure-bonded to the side surfaces of these heat transfer tubes, their legs are stopped. At the same time, in particular, when the arms 17 are opened, the guide rollers 15 are actuated by the guide roller cylinders 16 to change their directions from the drive section 4 toward the heat transfer tube 1 and contact the upper and lower surfaces of the heat transfer tube 1. The rotation will be stopped when it is placed at.

By such an operation, the cleaning device 2 can be attached to the heat transfer tube 1 so that it can be moved in the axial direction (horizontal direction) of the heat transfer tube 1 for the time being.

(3) The movement of the cleaning device in the tube axis direction is performed by the rotation of the traveling roller 13 driven by the traveling roller motor 14. In this case, the traveling roller 13 that is pressure-bonded to the heat transfer tube 1 supports the self-weight of the cleaning device 2, and the guide roller 15 not only guides the cleaning device 2 in the tube axis direction, but also this cleaning device. Will support.

(4) Then, when the cleaning device horizontally moves to and reaches the vicinity of the cleaning location, first, the rotation of the traveling roller 13 is stopped. Next, in this state, the jig ball screw 6 connected to the shot blast nozzle 5 shown in FIGS. 6 to 7 is rotated (driven) by the jig motor 7. By this rotation, the shot blast nozzle 5 moves up and down along the groove 12 of the side plate 11 and is positioned at the cleaning location.

After that, shot grains and high-pressure air are supplied from a shot blaster device (not shown) arranged outside the heat transfer tube 1 to surely polish the outer surface of the heat transfer tube 1.

Therefore, if the outer surface of the heat transfer tube 1 is cleaned by this work, the heat transfer tubes in the vertical direction of the tube are sequentially
Cleaning will be performed within a constant interval of the groove 12.

In particular, in the case of cleaning by shot blasting as described above, in order to prevent the ball screws 6, 19 and each device from being affected by the scattering of shot particles, it is preferable to expand and contract a protective cover around them ( (Not shown) may be attached.

(5) Then, after the cleaning work, the vertical movement of the cleaning device 2 in the vertical direction of the pipe 1 will be described. The following description will be made by taking as an example the case where the entire apparatus 2 is lowered in the lower direction of the heat transfer tube 1.

Then, as shown in FIGS. 3 to 5, first, when the nail cylinder 23 is activated, the two pairs of nails housed in the main body 3 are
22 The direction of each of them is changed to the position of about 90 ° toward the left and right adjacent heat transfer tubes 1, and the conversion is stopped when hooked (abutted) on the upper surface of the heat transfer tube 1.

Subsequently, the arm 17 is connected to the arm cylinder via the link 24.
As it is housed in the drive unit 4 by adjusting 25, the pressure of the traveling roller 13 that is pressed against the side surface of the heat transfer tube 1 is gradually released. And the guide roller
15 is also closed by the guide roller cylinder 16 and is stored again in the drive unit 4.

Therefore, the weight of the cleaning device 2 is the weight of the claw that is brought into contact with the heat transfer tube 1.
Only 22 will be supported.

(6) Next, each lifting motor 20 is driven from this state to rotate the lifting ball screw 19. At this time, the rotation speeds of the lifting motors 20 are controlled to be the same. As a result of this rotation, the drive unit 4 (support frame 18) which is connected to the front and rear of the main body unit 3 and is integrated is guided along the ball screws 19 for raising and lowering the slider 21, and each pillar 9
While sliding along, it descends relative to the main body 3.

In this way, when the drive unit 4 descends and reaches a predetermined position, this time, similarly to the above item (2), the traveling roller 13 is again pressed against the side surface of the heat transfer tube 1 and the guide roller 15 is pressed.
Each is brought into contact with the upper and lower surfaces of the tube 1.

(7) On the other hand, in the main body 3 remaining in the upper position,
The claw cylinder 23 is rotated to house each claw 22 in the main body, and then the lifting ball screw 19 is rotated in the opposite direction to the item (6). It will descend to a predetermined position and stop.

(8) By repeating the above-described operation, the cleaning device can be freely and accurately lowered below the heat transfer tube 1, and can also be raised upward by performing the operation opposite to these. it can.

Effects of the Invention As described in detail above, according to the present invention, it is possible to both move the tube heat transfer tube in the tube axis direction and move it up and down in the tube up-down direction, and to reduce the outer surface of the boiler heat transfer tube. Cleaning can be done automatically and remotely. Due to this, a narrow panel was opened mechanically until now, a worker entered inside, and what was manually polished with a jet chisel or grinder was automatically attached to this cleaning device. With a cleaning tool such as a blast nozzle, the outer surface of the heat transfer tube, which was impossible to clean, can be cleaned sufficiently and accurately.

Therefore, the labor of cleaning the outer surface of the heat transfer tube can be greatly saved and the number of steps can be surely reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part showing an example of a cleaning device for the outer surface of a heat transfer tube according to the present invention, FIG. 2 is a front view thereof, FIG. 3 is a side view showing its running state, and FIG. 4 is its transfer state. FIG. 5 is a side view showing the state of FIG.
The figure shows a partial front view showing the attachment of a cleaning jig (shot blast nozzle) to the main body, FIG. 7 shows a partial side view of the same, and FIG. 8 shows a conventional manual cleaning or inspection of a horizontal heat transfer tube. It is a figure which shows the situation of. 1 ... Heat transfer tube, 2 ... Cleaning device, 3 ... Main body, 4 ...
Drive part, 5 ... Shot blast nozzle, 6 ... Jig ball screw, 7 ... Jig motor, 8 ... Upper and lower support plates, 9 ... Pillar, 13 ... Travel roller, 14 ... Travel roller Motor, 15 …… guide roller, 16 …… guide roller cylinder, 17 …… arm, 18 …… support frame, 19 …… lifting ball screw, 20 …… lifting motor, 21 …… slider,
22 …… claw, 23 …… claw cylinder, 24 …… link, 25 ……
Cylinder for arm.

Claims (1)

[Claims] 1. A cleaning device for an outer surface of a heat transfer tube, which is arranged in a gap between heat transfer tubes of a horizontal type boiler or the like and is movable along an axial direction and a vertical direction of the heat transfer tube, which cleans a blast shot nozzle or the like. A jig ball screw that raises and lowers the jig to a desired height and a jig motor are provided, and upper and lower support plates that support the jig ball screw and pillars arranged at the four corners of these support plates. A main body forming an outer shell, a running roller for moving the main body along the axial direction of the heat transfer tube and a motor for the running roller, and a plurality of guide rollers for guiding and opening / closing the heat transfer tube and for the guide roller It is composed of a set of arms that integrates cylinders and two drive parts having a support frame that supports these arms, and one end of the support frame of these drive parts is connected to the front and rear of the main body part through the pillar. Can slide on And a pair of lifting ball screws and lifting motors are provided in front and rear of the main body so that the main body and the driving section move up and down relative to each other. A plurality of claws that are connected to each other and that hold the main body part and the drive part that are hooked and integrated on the adjacent left and right heat transfer tubes, and a claw cylinder that changes the direction of these claws are provided. On the other hand, a cleaning device for an outer surface of a heat transfer tube, in which an arm cylinder that connects the arms to the drive unit side so as to be horizontally opened and closed via a link is attached to the support frames.