JPH0723685Y2 - Furnace wall tube thickness measuring device - Google Patents

Description

[Detailed Description of the Invention] Industrial field of application The present invention is applied to an evaporator pipe, a superheater pipe, a economizer pipe, a steam cooling pipe, a reheat pipe, etc. which constitute a furnace wall surface of a boiler, a heat exchanger, an incinerator, etc. The present invention relates to an applied furnace wall tube thickness measuring device.

2. Description of the Related Art Conventionally, the soundness of furnace wall pipes has been confirmed by measuring the outer diameter and wall thickness of various furnace wall pipes as described above in regular and aged inspections of industrial boilers and the like. In other words, since the wall thickness of the furnace wall tube is reduced due to oxidative corrosion, etc., the tube will blow up and the boiler etc. will stop, so in order to prevent this, the thickness of each tube is detected in advance, and replacement etc. To judge. In this case, as shown in FIG. 7 and FIG.
To measure the outer diameter and wall thickness of the
First, in the preparatory stage, for example, a grinder (not shown) and an ash removal tool 2 (see FIG. 7) are used to remove adhered ash and the like, and the surface of the furnace wall tube 1 to be observed is cleaned. The non-destructive inspection is performed by the inspection tool 3.

The former ash removal tool 2 is mainly a shot blast nozzle.
Shot blasting work is carried out by manually using 2a to remove ash and scale s and clean the surface of the furnace wall tube 1.

Also, the latter inspection tool 3 advances the inspection work by manually using the probe (sensor) 3a of the ultrasonic thickness gauge, and transmits / receives the signal of the ultrasonic sensor 3a to the cleaning portion of the furnace wall tube 1. By doing so, the thickness of the tube 1 is inspected.

By the way, these cleaning / inspection operations are currently almost manually performed as described above, and various inspections by remote automation, which have been particularly demanded in recent years, have not been performed so far.

Problems to be Solved by the Invention However, the tubular object inspection device described above has the following problems.

Up until now, the outer surface of the furnace wall tube 1 has been polished and inspected manually, so that a scaffold (not shown) is assembled along the furnace wall so that workers can approach the inspection position.
After that, the operator manually ashed with the ashing tool 2 and then had to manually operate the inspection tool 3 for measurement.

For this reason, a lot of man-hours and construction period are required, including the construction of scaffolds, and the height of medium and large-sized boilers exceeds 10 m. There is also a problem.

Means for Solving the Problems The present invention, in order to solve such conventional problems, is a furnace wall tube thickness measuring device for remotely and automatically measuring the tube thickness of a furnace wall tube such as a boiler. The ash removal tool and the inspection tool are attached to a winch on a beam capable of supporting a load, a cable wire wound around the winch is extended from near the top to near the bottom of the boiler, and the wire is attached to a furnace wall tube. It is tilted in a substantially V shape and stretched so as to be tense in both the top and bottom directions.

By such means, the beam supports the ashing tool or the inspection tool, and the cable wire is stretched near the top and bottom of the boiler via the winch attached to the beam, and Since the wire is inclined in a substantially V shape, the wire is tensioned under a moderate tension, and a tension component force can be generated through the wire in a direction of pressing the beam against the wall surface of the furnace.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. In these figures, the same parts as those shown in FIGS. 7 and 8 are designated by the same reference numerals, and detailed description thereof will be omitted.

Therefore, according to the present invention, as shown in FIGS.
An almost rectangular beam (supporting beam) 4 is provided which can detachably attach the ash removal tool 2 and the inspection tool 3 and can support their loads. A pair of winches 5 are attached near both ends of the beam 4. Has been.

A plurality of arms 4'having appropriate length and strength so as to sandwich each winch 5 and abutting orthogonally to the furnace wall tube 1 are fixed to the beam 4. A furnace wall tube adsorbing device 4a including an electromagnet (magnet) that can be turned on and off by remote control or a suction cup that can hold and release a vacuum state is provided at a tip end portion of the arm 4'that abuts on the furnace wall tube 1. Is provided.

As shown in FIG. 3, the winch 5 has a motor 6 fixed to its main body 5 ', and a sheave 8 is directly connected to the motor 6 for winding a cable wire 7.

Further, as shown in the drawing, the cable wire 7 is wound one or more times around the sheave 8, and one end thereof is supported by a fixing pin 9 so as to press the wound portion of the wire 7,
Further, an arc-shaped lever 11 in which a plurality of pressure rollers 10 are arranged is arranged around the sheave 8. In this case, a pressing screw 12 screwed to the main body 5'is attached to the other end of the pressure roller 10 with a spring 13 interposed.

On the other hand, the wire 7 extends from the vicinity of the top 1a of the boiler 1 '(see FIG. 1) to the vicinity of the bottom 1b thereof to the other winding winches 5a, 5b arranged at their respective predetermined positions. .

Then, the wire 7 is inclined with respect to the furnace wall tube 1 in a substantially V shape, and is stretched so as to be tensioned in both directions of the top 1a and the bottom 1b of the boiler 1'through the winches 5a, 5b.

That is, through the wire 7, the winch 5 and other winches
In the positional relationship with 5a and 5b, when the wire 7 is stretched by the winches 5a and 5b on the top 1a and bottom 1b sides of the boiler 1'as described above, the middle portion of the wire 7 as shown in FIG. The winch 5 on the beam 4 side, strictly speaking, the sheave 8 relays the wire 7 due to the length (height) of the arm 4'part of the beam 4 that abuts on the furnace wall tube 1 which normally stands vertically. Is located inside the furnace wall tube 1 and the end of the wire 7 wound around the other winches 5a, 5b is on the vertical extension of the furnace wall tube 1 or near the outside of the furnace. Located in. As a result, when the wire 7 is stretched between the winches 5, 5a and 5b, the connected shape becomes a dogleg, and therefore the wire 7 is inclined while being kept at an appropriate angle. .

The other winches 5a and 5b are respectively provided on the top 1 of the boiler 1 '.
In the vicinity of a and the bottom portion 1b, the wire 7 can be moved forward, backward, leftward and rightward so that it can be used at any inspection location and the inclination angle of the wire 7 can be changed appropriately.

Further, since the number of wires is required to support both ends of the beam 4, the number of wires is one at each of the top and the bottom, that is, about four in total. However,
The present embodiment is not limited to this, but if the beam 4 is kept horizontal and the wire 7 is stretched in a dogleg shape, for example, a relay for the wire instead of a part of the winches 5a, 5b. Of course, the wire connection method and the operation method may be changed by interposing a device (not shown).

As shown in FIG. 4, the ash removal tool 2 as described above is roughly attached to the beam 4 and a shot blast nozzle is attached to a slider mechanism 2b which can be moved up and down by remote automatic.
2a is installed. In the figure, reference numeral 2c is a shot grain nozzle
2a shows a supply hose for supplying to 2a. On the other hand, as shown in FIG. 5, the inspection tool 3 is roughly equipped with the beam 4, and the ultrasonic thickness gauge sensor 3a is attached to the slider mechanism 3b which can be rotated by remote automatically drawing an arc in the left-right direction. It is installed.

With the above configuration, when the inspection position of the furnace wall tube 1 is determined at the time of inspection as shown in FIG. 1, the beam 4 equipped with the ash removal tool 2 is moved up and down in parallel with the furnace wall surface for the time being. First, other winding winches 5a and 5b at the top 1a and bottom 1b of the boiler 1'are provided with a certain amount of allowance in the upward and downward directions of the wire 7 so as to provide appropriate tension so as to move in the direction.

Next, in the winch 5 of the beam 4, since there is one set, both drives the motor 6 fixed to the winch main body 5'at the same rotation speed, so that the sheave 8 having one or more windings of the cable wire 7 is wound. Since it rotates, this allows the beam 4 to be raised or lowered in the upward or downward direction.

However, in this case, the captive screw 12 provided on the winch 5 (see FIG. 3) is loosened in advance, and the lever 11 with the fixing pin 9 as a fulcrum is freed, so that the rotation of the wire 7 is prevented. Keep it out.

By the rotation of the winch 5 as described above, the beam 4 can be suspended through the hoisting winch 5a of the top 1a of the boiler 1'and reliably moved to a predetermined inspection position.

The wire 7 itself uses the winch 5 on the beam 4 side as a relay point, and tension is applied to both the top 1a and bottom 1b of the boiler 1'by the other winches 5a and 5b, respectively.
Is inclined in a dogleg shape by the height of the arm 4 '.

Subsequently, the beam 4 is stabilized by adsorbing it onto the furnace wall tube 1 or the fixed ash s by the furnace wall tube adsorbing device 4a provided at the tip of each arm 4'of the beam 4.

Together with a cap screw that is screwed into the body 5'of the winch 5
When the screw 12 is tightened, the lever 11 is pressed against the outer periphery of the sheave 8 with the fixing pin 9 as a fulcrum by the urging of the spring 13 of the screw 12.

Therefore, a plurality of pressure rollers 10 attached to the lever 11
As a result, a part of the wire 7 wound around the sheave 8 is pressed in with a uniform pressure.

Therefore, the frictional force generated between the wire 7 and the sheave 8 due to the pressing of the roller 10 is larger with respect to the load W (see FIG. 3) of the beam 4 including the weights of the tool 2 and the winch 5, Moreover, since this state is maintained, the beam 4 can be kept stationary.

After that, the ash that sticks around the inspection position as shown in Fig. 4
By performing the shot blasting work while automatically moving the shot blast nozzle 2a up and down by the slider mechanism 2b, it is possible to reliably clean the above.

After completion of this work, the lever 11 of the winch 5 is loosened again, and at the same time, the suction of the suction device 4a is cut off so that the beam 4 is freed, and the winch 5 (sheave 8) is driven by the reverse drive of the motor 6. Rotate in the reverse direction to move up and down in the opposite direction.

Then, by replacing the ashing tool 2 with the inspection tool 3 and mounting it on the beam 4, and repeating the above operations, the inspection tool 3 can be moved to a predetermined inspection position as shown in FIG.

Then, the beam thickness can be measured by transmitting and receiving ultrasonic waves by fixing the beam 4 and bringing the ultrasonic thickness gauge sensor 3a into close contact with the furnace wall tube 1 by the slider mechanism 3b. When it is desired to change the close position of the sensor 3a, the inspection can be performed from another angle by automatically rotating the sensor 3a slightly by the slider mechanism 3b.

Here, the main reasons for simultaneously stretching the wire 7 from both directions of the top 1a and the bottom 1b of the boiler 1'will be described.

If only the load W of the beam 4 is to be supported, the cable wire 7 to which the beam 4 is attached may simply be suspended along the furnace wall surface from the vicinity of the top 1a of the boiler 1 '.

However, since the shot particles are sprayed onto the beam 4 almost at right angles to the furnace wall surface in accordance with this work, a horizontal reaction force acting to separate the beam 4 from the furnace wall tube 1 via the shot blast nozzle 2a is exerted. Similarly for the sonic thickness gauge sensor 3a,
Since the sensor 3a is closely inspected on the cleaned surface of the furnace wall tube 1, the horizontal reaction force for separating the beam 4 from the furnace wall tube 1 through the sensor 3a is more than that in the case of the ash dropping tool 2. Is small but works.

This phenomenon can similarly occur in other tools and other operations.

As a preventive measure, a method of adhering the beam 4 with a furnace wall tube adsorbing device 4a such as a magnet or a suction cup can be considered. However, since a large amount of combustion ash and scale s are adhered and deposited on the furnace wall surface, Beam 4 only with suction device 4a
The force for supporting the tool on the furnace wall surface is insufficient, and the tools 2 and 3 may be separated from the furnace wall surface during each work.

Therefore, as a remedy for this, as in the present embodiment, the boiler 1 '
By using the method in which the wire 7 is appropriately pulled by the other winches 5a and 5b arranged respectively from the bottom portion 1a together with the top portion 1a and is stretched in a substantially dogleg shape, 4. Strictly speaking, it is possible to keep the arm 4'always in contact.

That is, as shown in FIG. 6, the horizontal reaction force for separating the beam 4 from the furnace wall tube 1 is R, and for simplification, the tension T of the wire 7 by each hoisting winch 5a, 5b has the same magnitude. Assuming that the opening angle of the slanted wire 7 at the winch 5 is θ, the horizontal component force P ′ generated under each tension T is assumed.
Respectively, P ′ = T cos θ / 2.

Therefore, the resultant force P = 2P ′ = 2T cos θ / 2 becomes the total force to bring the beam 4 into contact with the furnace wall tube 1, and the resultant force P is the magnitude of each tension Y due to the winding of the wire 7 of the winches 5a and 5b, Also, the force against the horizontal reaction force R, in other words, the beam 4 in the furnace, is adjusted by appropriately taking the opening angle θ of the wire 7 determined by the positional relationship between the winches 5a and 5b and the winch 5 on the beam 4 side. It can be seen that the force is applied to the wall tube 1.

Effect of the Invention As described in detail above, according to the present invention, not only the beam is suspended by simultaneously pulling the wire in both the top and bottom directions of the boiler, but also the rotation of the winch attached to the beam causes the furnace wall tube to move. It can also be moved freely to the vertical inspection position.

Therefore, cleaning and inspection work at a predetermined inspection position can be performed easily and easily by remote and automatic operation.

Moreover, by manipulating such a beam, the man-hours, construction period, and construction cost required for the conventional scaffolding and dismantling work can be significantly reduced, and the safety of work at high places can be ensured.

Regarding the beam, let alone the tube thickness gauge,
It is also possible to mount another automatic inspection device, a repair robot, or the like to perform each predetermined inspection / work, and therefore, it is possible to promote labor saving and omission.

[Brief description of drawings]

FIG. 1 is a schematic structural sectional view showing an example of the furnace wall tube thickness measuring device according to the present invention, FIG. 2 is a view taken along the line II-II of FIG. 1, and FIG. 3 is a winch attached to the beam. Fig. 4 is a schematic structural cross-sectional view, Fig. 4 is a diagram showing the structure and use condition of an ash removal tool attached to the beam, Fig. 5 is a diagram showing the structure and use condition of an inspection tool attached to the beam, and Fig. 6 is FIG. 7 is a schematic diagram showing a component of tension generated when the wire is stretched in a substantially V shape, FIG. 7 is a diagram showing a conventional manual ash removal tool in use, and FIG. 8 is a conventional manual ash removal tool. It is a figure which shows the use condition of an inspection tool. 1 ... furnace wall tube, 1 '... boiler, 1a ... (boiler) top, 1b ... (boiler) bottom, 2 ... ash removal tool, 3 ...
… Inspection tools, 4 …… Beams, 5 …… Winches, 5a, 5b…
… Winding winches, 7 …… Cable wire, s ……
Ash.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Ken Ken Fujita, 2-1-1, Niihama, Arai-cho, Takasago-shi, Hyogo Prefecture Takasago Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Yoshihisa Nishikawa 2-1-1, Niihama, Arai-cho, Takasago, Hyogo Prefecture No. 1 Mitsubishi Heavy Industries, Ltd. Takasago Laboratory (72) Inventor Tsutomu Masaki 2-1-1, Niihama, Arai-cho, Takasago, Hyogo Prefecture Mitsubishi Heavy Industries Ltd., Takasago Laboratory (56) References: 61-181313 (JP, U) )

Claims (1)

[Scope of utility model registration request] 1. A furnace wall tube thickness measuring device for remotely and automatically measuring a furnace wall tube thickness of a boiler or the like, wherein a winch is attached to a beam capable of supporting load of an ash removal tool and an inspection tool, The cable wire wound around the winch extends from the vicinity of the top of the boiler to the vicinity of the bottom of the boiler, and the wire is inclined in a substantially V shape with respect to the furnace wall tube so as to be tensioned in both the top and bottom directions. A furnace wall tube thickness measuring device characterized by being stretched over.