JPH0722629Y2 - Boiler tube cleaning tool - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a boiler tube cleaning tool for removing adhered ash and oxide scale for measuring the outer diameter and wall thickness of a superheater tube and a reheater tube of a boiler. .

[Conventional technology]

The boiler tube has a panel shape. Since the gap between panels is around 100 mm, when cleaning and inspecting places where humans cannot reach, widen the panel gap to a size that the operator's body can put in, and use a one-handed hammer or jet chisel to clean the outer surface of the tube. After cleaning, the outside diameter and wall thickness are measured with a caliper and ultrasonic wall thickness gauge.

[Problems to be solved by the device]

 The above conventional method has the following problems.

(B) In order to clean the outer surface of the boiler tube, it is necessary to widen the gap between adjacent panels to a size that allows a person to enter.
To widen it, many panels are wrapped with a chain to narrow the gap between panels other than the target panel.

(B) In the case of a boiler tube of a hanging type superheater tube or reheater tube, if the cleaning position is close to the fixed part of the ceiling tube, the above-mentioned work of expanding becomes impossible and the outer diameter and wall thickness are measured. Can not.

[Means for Solving the Problems]

 The present invention takes the following measures to solve the above problems.

That is, as a boiler tube cleaning tool, a curved plate that forms a part of a cylindrical surface having a radius larger than the radius of the boiler tube, and a tip part that can be rotated around an axis along a generatrix of the end of the curved plate. A support guide which is connected and formed in a chain shape by a plurality of connecting plates, a cylindrical arm for housing the support guide, a means for inserting and removing the support guide from the arm, the curved plate and the support guide for the boiler. A means of wrapping or unwinding the tube,
Means for moving the curved plate in and out of the support guide,
A boiler tube cleaning tool comprising: a plurality of jet hammers attached to the inner surface of the curved plate.

[Action]

By the above means, the support guide is removed from the arm excluding its tip, and the curved plate is housed between the pair of connecting plates at the tip of the support guide, and inserted from between the panels to the target boiler tube. Move the front of the tip of the support guide closer. Next, the curved plate is pulled out by a means for inserting and removing the curved plate from the support guide, and the jet hammer is operated to apply it to the lower portion of the boiler tube for cleaning. Next, while accommodating the curved plate by the means for taking in and out, and by means for winding the support guide in and out of the arm and means for winding or unwinding the curved plate and the support guide around the boiler tube, while applying the jet hammer to the boiler tube, Take out the support guide from the arm and wind it around the boiler tube. In this way, if the jet hammer is moved over the entire circumference along the circumferential direction of the boiler tube, the entire circumference can be cleaned by this series of operations. The curved guide plate and the support guide are wound around or unwound from the boiler tube, and the support guide is unwound from the boiler tube to move to the next step.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 is a side view of the tip, FIG. 2 is a detailed side view of the tip,
3 is a detailed side view of the whole, FIG. 4 is a detailed rear view of the base,
FIG. 5 is a detailed front view of the tip portion.

In FIG. 1, the curved plate 2 has a curved surface forming a part of a cylindrical surface having a predetermined radius, which is slightly larger than the radius of the boiler tube 37, and the length thereof is about a quarter of the circumference of the tube 37. It is a face plate. The support guide 1a is, as shown in FIGS. 2 and 3,
The connecting plates 1, 9 to 15 are sequentially connected in a chain shape. Further, when the connecting plates 1, 9 to 13 from the tip to the center are arranged with the tube 37 being wound therein as shown in FIG. 3,
The surface facing the surface of the tube 37 (front side) and the surface opposite the facing surface (back side) are curved surfaces along the surface of the tube 37, and the length of the connecting plate 1 is that of the curved plate 2. A little longer than the length, the connecting plates 9 to 13 each have a length divided into about 7 along the circumferential direction of the tube 37. The connecting plate 1 has a shaft 4 parallel to the generatrix of the inner surface of the curved plate 2 when the tube 37 is wound with the curved plate 2 housed inside (FIG. 3).
Then, both ends are connected to both sides of the end of the curved plate 2 (5th
A gear 5 is attached to the left outer surface of the connecting plate 1 at the left end of the shaft 4. Further, the shaft 4 is fixed to the curved plate 2. The connecting plates 1 and 9 to 13 are connected to each other by a shaft 16 parallel to the shaft 4 to form a chain. Connecting plate
14 and 15 have a predetermined length longer than the connecting plates 9 to 13 and have a side surface width substantially equal to the width of the connecting plates 9 to 13. The connecting plates 9 to 15 are axially housed in a square or cylindrical arm 19. The base end of the connecting plate 15 is connected by a plate having a surface perpendicular to the axis of the arm 19 (FIG. 4), and a female screw 32 having an axis parallel to the axis is attached to the plate. Further, a motor 34 having a male screw for fitting a female screw is attached to a fixing plate 35 at the base of the arm 19.

On the other hand, a B wire 17 is provided along the front side of the support guide 1a (Fig. 3). The tip of the B wire 17 is fixed to the base of the connecting plate 1 and to the central portion (FIG. 5) on the front side, and the guide 50 is provided on the front side and the front and end of the connecting plates 9 to 13. And it is guided in the proximal direction through the guide roller 20 provided at the tip of the connecting plate 15. Further, its base end is connected to a B wire winding tool 21 attached to the inside of the connecting plate 15. Further, the B wire take-up tool 21 is a motor mounted inside the connecting plate 15 via a worm / worm gear 22.
It is connected to 23.

A C wire 18 is provided along the back side of the connecting plates 1 and 9 to 15. The tip of the C wire 18 is fixed to the central portion on the back side of the connecting plate 1, and a guide 51 provided on the back side of the connecting portion of the connecting plates 1 to 13 and a guide roller provided on the leading end of the connecting plate 15. Guided in the proximal direction via 20. Further, its base end is connected to a C wire take-up tool 24 attached to the inner central portion of the connecting plate 15. 25 is a worm / worm gear,
26 indicates a motor.

A chain 6 is provided on the gear 5. Furthermore, the A wire 7 is connected to both ends of the chain 6. Also A wire 7
Is guided in the proximal direction through a wire guide 8 provided at the center of the left side surface of the connecting plates 1 and 9 to 14 and is connected to both ends of the chain 6a. The chain 6a is hooked on a gear 29 provided at the base of the connecting plate 15. In FIG. 4, 29 is a worm / worm gear, 30 is a motor, and 31 is a motor support.

Further, on the inner surface of the curved plate 2, microscopic air type jet hammers 3 are provided in 3 rows and 3 columns with the axes parallel to the normal direction and being shifted by half pitch between rows. In the above configuration, the curved plate 2 is housed in the connecting plate 1, and the connecting plates 9 to 15
When the arm 19 is inserted between the panels with the arm 19 stored in the arm 19, the front surface of the tip of the support guide 1a is moved closer to the target tube 37, and the motor 30 is rotated, the chain is connected via the A wire 7 6. The gear 5 rotates, the curved plate 2 is pulled out from the connecting plate 1, and the jet hammer 3 hits the lower part of the tube 37 (a gap is provided in FIG. 1 and the drawing for easy viewing). The jet hammer 3 is operated to perform cleaning. Further, when the motor 34 is rotated while rotating the motor 30 in the reverse direction, the connecting plates 1, 9 to 15 are pushed toward the tip of the arm 19 via the male screw 33 (FIG. 2). Further, while rotating the motor 34, the motors 23 and 26 are rotated so that the B wire 17 is wound and the C wire 18 is unwound, and the connecting plate 1 and 9 to 13 are connected to the tube 37.
Is involved (Fig. 3). Tube in this way
If you move the jet hammer 3 along the circumferential direction of 37,
Can be cleaned all around.

As described above, the entire circumference of the tube 37 can be cleaned almost over the range hit by the jet hammer 3 by a series of operations.

[Effect of device]

 As described above, the present invention has the following effects.

(1) It can be easily inserted between panels, and the entire circumference of the target tube can be cleaned by a series of operations.

(2) Since the jet hammer moves from the direction orthogonal to the axis of the target tube and moves along the circumferential direction of the tube, it can be applied to the bent portion of the tube.

[Brief description of drawings]

FIG. 1 is a side view of the tip of one embodiment of the invention, FIG. 2 is a detailed side view of the tip of the same, and FIG. 3 is an overall side view (partial sectional view) of the same. 4 is a detailed rear view of the base portion of the same embodiment, and FIG. 5 is a front detailed view of the tip portion of the same embodiment. 1a …… Supporting guide, 2 …… Curved plate, 3 …… Jet hammer, 4
…… Axis, 5 …… Gear, 6,6a …… Chain, 7 …… A wire, 1,
9 to 15 …… Connecting plate, 16 …… Axis, 17 …… B wire, 18 …… C wire, 19 …… Arm, 20 …… Guide roller, 21 …… B wire winding tool, 22 …… Warm ・Worm gear, 23 …… motor, 24 …… C wire winder, 25 …… worm / worm gear, 26 …… motor, 27 …… motor support, 28 …… A wire winder, 29 …… worm・ Worm gear, 30 ... motor, 3
1 …… Motor support, 32 …… Female thread, 33 …… Male thread, 34 ……
Motor, 35 ... Fixing plate, 36 ... Arm connection part, 37 ... Tube, 50,51 ... Guide

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hiroshi Shimoyama, 1-1, Niihama, Arai-cho, Takasago-shi, Hyogo Prefecture, Takasago Research Center, Mitsubishi Heavy Industries, Ltd. (72) Tsutomu Masaki 2-1-1, Niihama, Arai-cho, Takasago, Hyogo Prefecture No. 1 Mitsubishi Heavy Industries, Ltd. Takasago Research Institute (72) Creator Katsuhiro Koga 1-1-1, Wadasakicho, Hyogo-ku, Kobe, Hyogo Prefecture Mitsubishi Heavy Industries Ltd., Kobe Shipyard

Claims (1)

[Scope of utility model registration request] 1. A curved plate which forms a part of a cylindrical surface having a radius larger than that of a boiler tube, and a plurality of distal ends which are joined so as to be rotatable about an axis along a generatrix of an end of the curved plate. A support guide formed in a chain shape by a connecting plate, a cylindrical arm for housing the support guide, a means for taking the support guide in and out of the arm, and winding the curved plate and the support guide around the boiler tube. A boiler tube cleaning tool comprising: a means for attaching or detaching, a means for taking in and out the curved plate from the support guide, and a plurality of jet hammers attached to the inner surface of the curved plate.