JP2526333Y2 - Working station - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working station which can be moved up and down in a furnace of a boiler of a thermal power plant or the like and which is used for maintenance and inspection work in the boiler furnace while the tank is stopped.

[0002]

2. Description of the Related Art In a particularly large boiler such as a thermal power plant, it is necessary to perform regular inspection and maintenance of the inside of the boiler furnace every year. In particular, these operations are performed on evaporating tubes, burners, heater tubes, etc. in the furnace. To do this, it is necessary to assemble a total scaffold using pipes and scaffold plates.

[0003] In addition, when inspecting each part, ash on the inner wall of the furnace, inspection and inspection such as polishing work, visual inspection, flaw detection and wall thickness measurement.
At present, almost all skilled workers manually carry out recording work by bringing ash removing tools and inspection tools into the furnace.

Therefore, a conventional in-furnace work scaffold constructed as described above will be described with reference to FIG. 9. 1 is a furnace, 2 is a furnace bottom, and 3 is a vertical single pipe such as a pipe forming a pillar. Or log), 4 is a horizontal single pipe such as a pipe, and 5 is a scaffold plate.

[0005] Usually, in order to assemble the in-furnace working scaffold in the furnace 1, first, a plurality of vertical single tubes 3 are arranged on the furnace bottom 2 at appropriate intervals along the inner periphery of the side wall. Then, the horizontal single pipe 4 is attached to these at the lower stage side. Then, the scaffold plate 5 is placed on the horizontal single pipe 4 and secured with a connecting tool to form a scaffold.

[0006] In this manner, the in-furnace working scaffold on the upper stage is sequentially erected toward the upper part of the boiler furnace.

Accordingly, as shown in the figure, the in-furnace working scaffold is assembled in a substantially rectangular shape so as to cover the entire inner walls of the four surfaces constituting the furnace.

In the figure, reference numeral 6 denotes a plurality of stairs for raising and lowering, which are provided for each step of the scaffold plate 5, and which are inspected by an operator who moves up and down the stairs 6. Necessary parts on the inner wall are maintained and inspected.

[0009]

However, the above-mentioned conventional scaffold for working in a furnace has the following problems. (1) Problems related to the total scaffold erection a) When performing the upper work in the furnace 1, the scaffold must be constructed almost sequentially from the furnace bottom 2 and assembled on the entire inner wall. Yes, and because all the series of operations such as carrying in and out, assembling, dismantling, etc. are performed manually,
It requires a large number of man-hours and a period of work, leading to an increase in construction costs and a decrease in work efficiency. b) Assembling and dismantling of the scaffold is a work at a high place, and it is difficult to ensure safety. c) In many cases, skilled workers required for assembling the scaffold cannot be satisfied, which hinders construction. (2) Problems related to inspections, etc. a) Manual work requires many inspectors, man-hours, and construction periods. b) There are individual differences in the operation and judgment. c) It takes a lot of time to organize inspection records. d) Work inside the furnace involves dirt and danger.

The present invention has been made in view of the above circumstances, and has as its object to provide a working station which has solved the above-mentioned problems.

[0011]

According to the present invention, a first scaffold / outer frame that rises and falls over the entire height of the front wall of the boiler furnace and a middle stage on the rear wall of the furnace are provided. A second scaffolding / outer frame that moves up and down below the formed arch portion, wherein each scaffolding / outer frame includes a boiler steel frame above a boiler ceiling wall and a plurality of pulleys mounted inside the arch portion. One end of the hanging wire hung on the scaffolding / outer frame and the beam passed inside is fixed via a load meter, and the other end is received by a plurality of elevators fixed to the scaffolding / outer frame and the beam, Based on the values of the load cell and the height sensor attached to the beam, it is controlled and raised in a horizontal position, and equipped with a ash removal device and an inspection device on the inner wall of the furnace along horizontal rails installed on each scaffolding / outer frame. Traveling the truck, and the first The place / outer frame is characterized in that a part of the outer frame on the rear wall side in the furnace is a movable scaffold / outer frame, and this movable scaffold / outer frame enters and exits along the inclined surface of the arch part. A working station is provided.

[0012]

According to the above means, the scaffold / outer frame is suspended in the furnace via the pulley provided on the boiler steel frame and the pulley provided inside the arch portion, and a plurality of elevators mounted on the beam of the outer frame are suspended. Of the four corners, the height sensor is controlled, and the other intermediate ones are controlled by a load cell to unwind and rewind the suspension wire. , And ascends and descends while equally sharing the load. Since each ash removing device and the inspection device are mounted on the horizontal rail of the outer frame via a bogie, the maintenance and inspection work of the furnace inner wall surface can be automatically performed by running these devices on the horizontal rail. In the vicinity of the arch, the movable scaffold / outer frame is moved in and out by the drive motor to perform maintenance and inspection work on the arch.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS.

FIG. 1 shows a mounting position of a pulley for suspending and supporting a working station, FIG. 2 shows a structural composition of the working station, and FIG. 3 shows a structural composition of a scaffold / outer frame on a front wall side. ing.

A boiler steel frame 8 for supporting the entire furnace is provided above the ceiling wall 7 in the furnace 1. The interior 1 of the furnace is surrounded by a ceiling wall 7, a front wall 9 composed of a panel of evaporating tubes (not shown), left and right side walls 10, a rear wall 11, and a furnace bottom 2, of which a middle part of the rear wall 11 is not shown. An arch portion 12 having a substantially U-shaped cross section for reducing the flow of combustion gas by the burner is formed, and a plate-type superheater 13 is suspended above the arch portion 12.

At an appropriate position near the front wall 9 of the boiler steel frame 8, an erecting suspender 14 is provided, and a plurality of pulleys 15, preferably at least four or more, are attached to this. On the other hand, the suspended suspension base 1 is also provided inside the rear wall 11 side arch portion 12 below the ceiling wall 7.
6 to which at least four or more pulleys 17 are attached.

Hanging wires 18 and 19 are hung on the pulleys 15 and 17 of both the boiler steel frame 8 and the arch portion 12, respectively, and through the through holes 20 and 21 opened in the ceiling wall 7 and the arch portion 12, respectively. So that the respective suspending wires 18 and 19 are engaged with the scaffolding outer frames 22 and 23 and stretched.

That is, as shown in FIG. 2, the working station has a front wall 9 and left and right side walls 10 due to the structure of the boiler.
The scaffold / outer frame 22, which is put in the area between the front and the plate-type superheater 13 near the rear wall 11 above the inside of the furnace 1, and the area where the left and right side walls 10 are behind and the area in the rear wall 11 are put. Another scaffold / outer frame 23 is required.

The scaffold / outer frames 22, 23 are assembled in a square shape whose outer shape is substantially equal to the cross-sectional shape of the inside of the furnace, and a plurality of reinforcing / shared beams 24, 25 are passed inside thereof.
A plurality of pillars 26 and 27 are suspended, and the pillars 26 and 2
7, horizontal rails 28 and 29 are mounted horizontally. As shown in FIG. 3, the scaffold / outer frame 22 on the front wall side is also provided.
, A movable scaffold / outer frame 30 extending toward the rear wall 11 is attached.
2, the guide shafts 35, 36 enter and exit through the spur gear 33 and the guide shaft 34 with a rack, and all of these members can be disassembled and assembled in the furnace 1.

The scaffold / outer frames 22, 23
And suspending pieces 37,
38, one ends of the suspension wires 18 and 19 are fixed to the suspension pieces 37 and 38 via load cells 39 and 40.

As an example, the scaffold / outer frame 22 shown in the drawing is provided with three beams 24 and the suspension wires 18.
Are set at six points with reference to the hanging piece 37, two beams 25 are passed to the other scaffolding / outer frame 23 having an area smaller than that of the scaffolding / outer frame 22, and the hanging point of the hanging wire 19 is provided. There are four points based on the hanging piece 38.

Also, near the ends of the beams 24 and 25,
A plurality of electric lifts 43 having height sensors 41 and 42;
For example, six lifts 43 and four lifts 44 are attached to the lifts 43, and these lifts 43, 44 are wound around the other ends of the suspension wires 18, 19.

In FIG. 2, reference numerals 45 and 46 are attached to the outer periphery of the scaffold / outer frames 22 and 23 at appropriate intervals, and guide rollers 47 and 48 for reducing sway.
Is an outer handrail, 49 and 50 are inner handrails, 51 is an arm portion provided for the arch portion 12, and 52, 53 and 54 are carts running on the horizontal rails 28 and 29, respectively.

FIG. 4 shows the structural composition of the elevators 43 and 44.
A sheave 56 for winding the windings 8 and 19 is directly connected.

The sheave 56 has hanging wires 18, 19.
Is wound one or more turns, and one end of the fixing pin 57 is pressed so as to press the wound portions of the wires 18 and 19.
, And an arc-shaped lever 59 in which a plurality of pressure rollers 58 are arranged is disposed around the sheave 56.
In this case, a pressing screw 60 is attached to the other end of the pressing roller 58 via a spring 61 to urge the lever 59.

FIG. 5 shows the structural composition of the height sensors 41 and 42. The height sensors 41 and 42 can be constituted by, for example, pulse encoders, and are fixed to the upper portions of the elevators 43 and 44 by mounting jigs. A sheave is provided on the sensor input shaft, and the sheave is pressed against the suspension wires 18 and 19, and the height is detected by counting rotation pulses in the winding margin.

FIG. 6 shows load cells 39 and 40, that is, load cells.
7 and 38 and the suspension wires 18 and 19 are attached. As a result, the suspension wires 18,
19 to each of the pulleys 15 and 17 via scaffolding / outer frames 22 and 2
3 is to be borne and suspended.

Then, horizontal rails 28 and 29 are attached to the pillars 26 and 27 which stand up from the scaffolding outer frames 22 and 23. In this case, the shapes of the horizontal rails 28 and 29 are determined according to the working range of the scaffold / outer frames 22 and 23 in the furnace 1. Regarding the scaffold / outer frame 22 suspended from the boiler steel frame 8, the horizontal rail 28 is required because of the necessity of working in the gap between the front wall 9 above the furnace 1 and the plate-type superheater 13 near the rear wall 11. It is formed in a substantially rectangular shape. In addition, as for the scaffolding / outer frame 23 suspended from the arch portion 12, the horizontal rail 29 has a substantially U-shape due to the necessity of working below the left and right side walls 10 and the rear wall 11 up to the arch portion 12. Is formed.

The horizontal rails 28 and 29 have the structure shown in FIG.
As shown in the figure, the ash removal device 62 and the inspection device 63 for maintenance and inspection of the front wall 9, the left and right side walls 10, the rear wall 11, the plate-type superheater 13 and the like in the furnace 1 can be run. Mounted carts 52, 53 and 54 are provided.

The ash removing device 62 and the inspection device 63
Are supported by carts 52, 53, 54 which move horizontally along the horizontal rails 28, 29, and extend to the front wall 9, the left and right side walls 10, the rear wall 11, and the plate-type superheater 13 to be inspected. An extended, rotatable and linearly movable arm 64 is attached to the distal end of the arm 64 together with an ITV camera 65 for remote viewing. In particular, the ash removing device 62 is provided with an ash removing polishing tool such as a shot blast or a jet flap. The inspection device 63 includes an inspection head for magnetic flaw detection, ultrasonic flaw detection, or the like.

Next, the operation will be described.

At the time of maintenance and inspection of the front wall 9, the right and left side walls 10, and the rear wall 11, two scaffolding outer frames 22 and 23 pre-assembled at the hearth 2 and a pulley 15 provided on the boiler steel frame 8 to a ceiling wall 7. The suspension wire 18 hanging down into the furnace 1 through the through hole 20 and the pulling wire 17 also hanging from the pulley 17 provided inside the arch portion 12 through the through hole 21 into the furnace 1.
And are fixed respectively.

That is, one ends of the suspension wires 18 and 19 are fixed to a plurality of suspension pieces 37 and 38 attached to the beams 24 and 25 of the scaffold / outer frames 22 and 23 via the load meters 39 and 40, respectively. The other ends of the suspension wires 18 and 19 are rotatably wound around the sheave 56 of each of the electric lifts 43 and 44 to which the height sensors 41 and 42 are attached, so that the pulleys 15 and 17 can be used as scaffolding outer frames. The entire 22, 23 is suspended, thereby forming an integrated working station.

Here, the suspension wires 18 and 19 are tensioned by winding the suspension wires 18 and 19 once by fine rotation of the elevators 42 and 44, respectively.
The weight W of the scaffold / outer frames 22, 23 is gradually applied to 8, 19.

By this operation, a frictional force is generated between the suspension wires 18 and 19 and the sheave 56 by the pressing of the plurality of pressure rollers 58 provided on the lever 59 of the elevators 43 and 44, and the sheave by the electric motor 55 is generated. With the rotation of 56, the inside of the furnace 1 can be automatically raised upward while holding the scaffolding outer frames 22, 23 in a horizontal posture.

At this time, preferably, up to the arch portion 12,
The hoisting speeds of the scaffolding outer frames 22, 23 are set to be the same, and the raising operation is performed simultaneously so that the two scaffolding outer frames 22, 23 can be used as one floor.

When the scaffolding outer frames 22, 23 are stopped at a predetermined working position, the pillars 26,
27 and each U-shaped horizontal rail 2 laid on 27
Ash removal device 62 and inspection device 63 mounted on 8, 29
The trucks 52, 53, 54 that support are moved to the maintenance and inspection location.

Then, the positions of the ash removing devices 62 and the inspection devices 63 are finely adjusted and adjusted by respective operations of rotating and linearly moving the arm 64 at an appropriate angle. It is possible to reliably reach the target inspection target position.

In this case, the ash removing device 62 is attached to the arm 64.
Also, since the ITV camera 65 is attached together with the inspection device 63, it is possible to always perform remote viewing while the vehicle is running. Therefore, even if the workers do not dare to step on the scaffolding outer frames 22, 23, the trolleys 52, 53, 54 can be remotely moved to a desired inspection location.

At the maintenance inspection point, first, the ash removing device 62 completely removes the ash fixed to the wall surface, and then the inspection device 63 can measure the thickness of the evaporating tube and the like. The measurement data result is analyzed and recorded by a computer-based measurement value analyzer provided outside the boiler furnace via a measurement value detection signal line (not shown).

Further, such an operation is sequentially performed for each work height position.
When 3 reaches the lower upper limit position of the arch portion 12, the scaffolding / outer frame 23 finishes the maintenance inspection of the working range behind the right and left side walls 10 and the rear wall 11, and the scaffolding / outside frame on the front wall 9 side. The maintenance and inspection of the remaining inner wall surface is performed using only the frame 22.

The scaffold / outer frame 22 performs maintenance and inspection of the inclined surface of the arch 12 by moving the movable scaffold / outer frame 30 in and out of the arch portion 12 by the drive motor 32. 7, a series of front walls 9, right and left side walls 1 are raised.
0 The work in front is continued, and the plate-type superheater 1
3 can also perform the maintenance and inspection completely.

The mechanism for moving the movable scaffold / outer frame 30 in and out of the arch portion 12 is as described above. To operate the movable scaffold / outer frame 30 along the inclination of the arch portion 12, Perform as follows.

A drive motor 32 is driven by a person operating a movable scaffold / outer frame control panel (not shown) in accordance with the elevation of the scaffold / outer frame 22 and a guide shaft with a rack via a spur gear 33. 34, and the movable scaffold / outer frame 30 is moved in and out.

As a result, as shown in FIG. 1, the moving amount of the movable scaffold / outer frame 30 corresponding to the elevation of the scaffold / outer frame 22 can be set along the inclined surface of the arch portion 12.

Note that this operation may be performed by a person looking at the positional relationship between the inclination of the arch portion 12 and the movable scaffold / outer frame 30 as described above, but the elevation height is detected by the height sensor 41. Therefore, it is also possible to set the amount of entry and exit according to the height in advance, and to automatically enter and exit.

The lifting control method when the scaffold / outer frames 22, 23 are lifted will be described with reference to FIG.
As shown in FIG. 7, any one of the four-corner elevators 43, 44 is operated at a constant speed as a reference electric elevator, and the remaining three
Similarly, the two corner electric elevators and the auxiliary electric elevator between them are started at a constant speed operation.

However, in a normal operation state, speed unevenness always occurs between the electric elevators due to various factors. Therefore, when the lift is high, the scaffolding / outer frames 22, 23 are shaken or tilted. When the height is large, the scaffolding / outer frames 22, 23 are attached to the front wall 9, the left and right side walls 10, the rear wall 11, and the plate. Contact or hooking occurs in the mold superheater 13, which hinders the progress of the inspection.

For this reason, especially for the corner motorized elevator, the absolute value of the difference between the detected value A of the height by the height sensors 41 and 42 of the reference motorized elevator and each value B of the other elevators is specified. If the difference exceeds the given value α, the difference is plus,
That is, when A is larger, the other ascending speed is increased by the difference, and conversely, when B is larger, that is, when B is larger, it is automatically controlled while decreasing the same. , 23 can be kept horizontal at all times.

At this time, since the auxiliary electric elevator follows the control and shares the load, if the value P of the load meters 39 and 40 is smaller than the allowable lower limit Wmin to fulfill this function, the ascending speed is increased. The tension of the suspending wires 18 and 19 is increased to increase the partial share of the load on the scaffolding outer frames 22 and 23. On the other hand, when the ratio is larger than the allowable upper limit value Wmax, the ascending speed is reduced and the same procedure is performed. This reduces the proportion of the load on the scaffold / outer frames 22, 23.

In this way, the scaffold / outer frames 22, 23 are used.
Can be easily maintained in a horizontal posture and the load can be evenly distributed.

Here, the reference electric elevator stops when the scaffold / outer frames 22, 23 reach a predetermined position, and also stops the other electric elevators. However, as shown in FIG. , 42 are compared with the value B, and the difference is 0.
If this is the case, the other electric elevator is operated at a low speed (slight rotation) for inclination correction, and if it is 0 or less, it is similarly operated at a low speed and stopped when it reaches exactly 0. To do.

In the descending mode, the control reverse to the above-described ascending and descending may be performed.

[0054]

[Effects of the Invention] As described in detail above, the working station according to the present invention can have a simple structure of only one floor as compared with the conventional total scaffold, so that the amount of construction materials can be greatly reduced. It is possible to reduce the number of man-hours required for carrying in and out, assembling, dismantling, and the like to about 1/4 and to shorten the construction period to about 1/2. In particular, according to the present invention, the furnace
Inspection and inspection of the arch part formed in the middle section on the inner rear wall side
Adjusting the allowance of the mobile scaffold and outer frame according to the location
Can be easily installed on the entire surface of the arch
The advantage is that you can access and work.

Further, since the series of preparatory operations can be performed at the furnace bottom, safety can be improved and a relatively unskilled general worker can be engaged.

In addition, while the operation is relatively simple, only a height sensor and a load cell are provided for controlling each elevator, the posture of the working station during lifting and lowering and during work is kept horizontal. It is possible to easily correct the unbalanced load applied to the scaffold / outer frame or the suspension wire, so that the reliability and safety at the time of ascending and descending and at the time of work are reliably improved.

Further, since the ash removing device and various inspection devices can all be mounted on the working station, the automation and robotization thereof can be promoted, and the number of workers can be reduced.
Human error can be eliminated. Moreover, a large amount of data processing can be quickly and accurately obtained, remote control and monitoring from outside the furnace can be easily performed, and the working environment can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view illustrating a mounting position and a use state of a pulley of a working station according to the present invention.

FIG. 2 is a perspective view of a main part showing a structural composition of a working station of FIG. 1;

FIG. 3 is a schematic diagram showing an operating state of a movable scaffold / outer frame.

FIG. 4 is a schematic diagram showing the structural composition of the elevator.

FIG. 5 is a diagram showing a mounting state of a height sensor.

FIG. 6 is a diagram showing a mounting state of a load cell.

FIG. 7 is a schematic view showing an example of a state where the ash removing device and the inspection device are attached to a horizontal rail.

FIG. 8 is a diagram showing a basic flowchart of a lifting and stopping control method.

FIG. 9 is a partial schematic perspective view showing a usage state of a conventional total scaffold.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inside furnace 2 Furnace bottom 7 Ceiling wall 8 Boiler steel frame 9 Front wall 10 Left and right side walls 11 Rear wall 12 Arch part 13 Plate-type superheater 14 Erecting suspension 15, 17 Pulley 16 Erecting suspension base 18, 19 Suspension wire 20, 21 Through hole 22, 23 Scaffolding / combination outer frame 24, 25 Beam 26, 27 Column 28, 29 Horizontal rail 30 Mobile scaffolding / combination outer frame 31 Beam 32 Drive motor 33 Flat gear 34 Guide shaft with rack 35, 36 Guide shaft 37, 38 Suspension pieces 39, 40 Load cells 41, 42 Height sensors 43, 44 Elevators 45, 46 Guide rollers 47, 48 Outer handrails 49, 50 Inner handrails 51 Arms 52, 53, 54 Bogie 55 Electric motor 56 Sheave 57 Fixed Pin 58 Pressure roller 59 Lever 60 Holding screw 61 Spring 62 Ash removing device 63 Inspection device 64 Arm Mu 65 ITV camera

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Shimoyama 2-1-1, Shinhama, Arai-machi, Takasago-shi, Hyogo Mitsubishi Heavy Industries, Ltd. Inside Takasago Research Institute (72) Inventor Hiroaki Shigemitsu 2-1-1, Araicho, Arai-machi, Takasago-shi, Hyogo Prefecture No. 1 In the Takasago Research Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Inventor Tsutomu Masaki 2-1-1, Shinhama, Araimachi, Takasago City, Hyogo Prefecture Inside the Takasago Research Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Inventor Katsuhiro Koga Wadazaki, Hyogo-ku, Kobe City, Hyogo Prefecture 1-1-1, Machi, Kobe Shipyard, Mitsubishi Heavy Industries, Ltd. (56) References Japanese Utility Model 3-14243 (JP, U) Japanese Utility Model 3-14244 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A first scaffold / frame which rises and falls over the entire height of a front wall side in a boiler furnace and a second scaffold which rises and falls below an arch portion formed in a middle section on the rear wall side of the furnace. Each scaffold / combination outer frame is connected to one end of a suspension wire hung on a boiler steel frame above the boiler ceiling wall and a plurality of pulleys attached to the inside of the arch portion and the scaffold / combination outer frame. And the other end is received by a plurality of elevators fixed to the scaffold / outer frame and the beam, and the value of the height sensor attached to the load cell and the beam is received at the other end. The trolley mounted with the ash removal device and the inspection device on the inner wall of the furnace is moved along a horizontal rail installed on each scaffolding / outer frame, and the first scaffolding / outer frame is controlled. Moves part of the outer frame on the rear wall side inside the furnace Working station, characterized in that in the field shared outer frame and out along the moving scaffold combined outer frame on the inclined surface of the arch portion.