JPH0349870A - Automatic blast device - Google Patents

Abstract

PURPOSE:To substantially reduce a time for blast work by providing a nozzle driving gear which is mounted onto a crawler carriage to support an injection nozzle to be moved along the surface of a rotary unit while the injection nozzle is face dot the blasted surface of the rotary unit. CONSTITUTION:Both end parts of a rotary unit shaft are supported by two sets of receiving bed devices 2a, 2b such as being possible to rotate a rotary unit 1, and a crawler carriage 20, which mounts driving gear 40, 60 possible to move a blast agent spraying injection nozzle 32 in directions of orthogonal three axes X, Y, Z contained with the horizontal X and Y-axis, runs on a rail 11 laid in a side or upper part of the devices 2a, 2b. Further a control is performed corresponding to the shape of a blasted surface with action of the injection nozzle 32 correlated to a rotary amount of the rotary unit. In this way, the full periphery of the rotary unit 1 can be evenly blasted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for cleaning a multi-stage, large diameter, and heavy rotating body, such as a rotor for a steam turbine, by spraying an abrasive onto it. .

[Conventional technology]

An example of a large rotating body that requires periodic cleaning equipment is the rotor of a steam turbine.

For example, a steam turbine in a 1100 MW nuclear power plant has a total of four rotors for high-pressure and low-pressure turbines, the maximum diameter of which is approximately 5 m, and the total length of each rotor is approximately 12 m.
It is a large rotating body with a weight of approximately 170 tons, a total number of stages of approximately 70 stages, and a total number of rotor blades installed in each stage of approximately 15,000.

During periodic inspections (abbreviated as periodic inspections) of steam turbines, the turbine components must be disassembled and inspected. In particular, rotors for nuclear power turbines can be damaged by steam flow during operation,
Because it can become contaminated with radioactivity, it is necessary to clean it before regular inspections. For this reason, cleaning (commonly known as honing work) is performed by injecting a powdered abrasive together with a high-speed fluid such as water or air. In this case, the polishing is done manually by workers wearing protective clothing in an isolation house (hereinafter referred to as a honing house) designed to prevent the scattering of radioactive materials, resulting in a large amount of work being done under poor working conditions. Effort and time are expended.

FIG. 1O is an explanatory diagram of a turbine rotor cleaning operation in the prior art. In FIG. 10, the rotor 1 is supported by rotor pedestals 2a, 2b, and temporary scaffolds 3a, 3b.
, 4a, 4b form a honing house 5,
The operator 6 operates the spray nozzle 9 to spray the abrasive supplied from the abrasive supply device 7 through the blast hose 8 onto the surface to be polished of the rotor 1 for cleaning.

In addition, as related to this type of installation
There is No. 161.

[Problem to be solved by the invention]

The problems with such cleaning are (a) the working environment is poor, (b) the work requires a high level of skill, and (c) the work takes a long time.

SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic cleaning device that does not require a high degree of skill or a great deal of labor and can shorten the required working time.

[Means to solve the problem]

In order to achieve the above object, the automatic cleaning device of the present invention supports both ends of the rotating body shaft by two sets of pedestal devices that allow the rotating body to rotate, and has an injection nozzle for spraying abrasive agent. A self-propelled trolley equipped with a drive device that allows the robot to move in three orthogonal axes, including the horizontal It is configured to run, and the operation of the injection nozzle and the amount of rotation of the rotating body are controlled in relation to each other in accordance with the shape of the surface to be polished.

[Effect]

According to the above configuration, by rotating the object to be polished while moving the injection nozzle in the normal direction of the rotation center on the horizontal center line or vertical center line of the rotating body, the entire circumference can be uniformly polished. can be cleaned.

If the part to be polished is a continuous surface in the circumferential direction (in the case of a turbine rotor, for example, the outer circumference of the rotor shaft, the disk surface, etc.), by continuously rotating the rotating body with the injection nozzle directed toward the part to be polished, The entire circumference can be cleaned, and if the part to be polished is a part arranged radially, such as the rotor blades of a turbine rotor, the blades to be polished can be cleaned horizontally or vertically. Moving blades - moving blades are installed radially around the entire circumference by intermittently rotating the rotating body while cleaning by moving the injection nozzle in the normal direction to the rotating body so that blades can be cleaned one by one. The wings can be ground one after the other. in this way,
By controlling the movement of the injection nozzle and the rotation method of the rotating body in a manner that corresponds to the part to be polished, the cleaning work can be carried out efficiently.

〔Example〕

FIG. 1 is a side view showing a first embodiment of an automatic cleaning device according to the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is a plan view of FIG. 1, and FIG. FIG. 5 is a side view showing the second embodiment, FIG. 5 is a front view of FIG. 4, and FIG. 6 is a plan view of FIG. 4.

For convenience of explanation, two horizontal orthogonal axes X and Y and a vertical axis Z are assumed as shown in the figure.

In FIGS. 1 to 6, a turbine rotor (hereinafter simply referred to as rotor) 1 is rotatably supported by rotor supports 2a and 2b. In FIGS. 1 to 3, a self-propelled cart 20 running along a rail 11 laid in the X-axis direction is equipped with an injection nozzle! 30 in the Y-axis direction;
The nozzle rotating device [50] rotates or oscillates as shown by the arrow, and the nozzle lifting device 60 controls the movement of the injection nozzle device [30] in the Z-axis direction.

In FIGS. 4 to 6, the rail device 1 is provided in the X-axis direction on the upper part of the support column 80 fixed on the rotor pedestal 2a.
An injection nozzle device 3 is attached to a self-propelled trolley 20 traveling along the road 1.
The configuration includes a nozzle rotating device ff50 that rotates or oscillates the injection nozzle device 4230 in the direction of the arrow R, and a nozzle lifting device [60 that controls the movement of the injection nozzle device 4230 in the Z-axis direction.

Fig. 7 is a detailed view of the injection nozzle section shown in Figs. 3 and 5, Fig. 8 is a sectional view taken along line A-A shown in Fig. 1 and Fig. 4, and Fig. 9 is a FIG. 10 is an explanatory diagram of the method of moving the nozzle, and is an explanatory diagram of the control of each device for the first embodiment shown in FIGS. 1 to 3.

The details of the first embodiment will be explained.

In FIG. 1, the abrasive supplied from the abrasive supply device (not shown, see 7 in FIG. 11) is supplied to the blast hose 31.
．． Through the nozzle device 30, the nozzle 3 as shown in FIG.
It is sprayed onto the surface to be polished from 2a or 32b. The rotor 1 has a shaft portion 1a.

A portion having a continuous surface over the entire circumference, such as the disk portion 1b and the shroud ring portion 1d, and the portions shown in FIG. There are portions that are discontinuous in the circumferential direction, such as the rotor blade portion 1c shown in FIG. Continuous part 1a.

When cleaning lb and ld, the rotor is rotated continuously while the injection nozzle 32a or 32b is kept in a fixed position, and after one revolution, the injection nozzle is moved and the rotor continues to rotate, thereby cleaning the entire circumference. -Efficient cleaning is possible. For a part that is arranged radially, discontinuous in the circumferential direction, and has a curved surface shape like the rotor blade part 1c, the injection nozzle 32 is swung in the direction of arrow R without rotating the rotor, and the ninth As shown in the figure, the injection nozzle 32 is moved from point IA to point 18, the rotor is rotated at point 1B, and
When the injection nozzle reaches the point, the rotation of the rotor is stopped and the injection nozzle is moved from point 2B to point 2A while performing rocking cleaning as shown in FIG. In this way, effective and efficient cleaning can be achieved by sequentially cleaning the adjacent rotor blades 1c radially while rotating the rotor intermittently. When cleaning the disk 1b and the opposite side of the rotor blade, the jet nozzle device 30 is operated by the nozzle rotating device 50.
180 degrees and perform the same operation as above. The shapes of the injection nozzles 32a and 32b are arbitrarily selected, such as a straight pipe shape or a curved pipe shape, to suit the surface to be polished, and are configured to be easily replaced. If the center height of the rotor differs due to the difference in rotor diameter or the size of the rotor pedestal, the height of the injection nozzle device 30 is adjusted by the nozzle lifting device 60 to match the center height of the rotor.

In the case of the second embodiment shown in FIGS. 4 to 6, the self-propelled trolley 20, which travels and is equipped with devices for operating the injection nozzle device 30 placed in the Z-axis direction, is moved in the X-axis direction. The difference from the first embodiment is that a support 80 for disposing the rail device 11 above the rotor for moving the rotor is fixedly arranged on the rotor holder 2a, and the point of the cleaning work is the same as that of the first embodiment. This is the same as the first embodiment.

In the case of the second embodiment shown in FIG. 5, only the left half of the rotor 1 can be cleaned, but turbine rotors are usually long and the entire length of the rotor can be cleaned by one automatic cleaning device. Grinding requires a long rail device, and it is often not practical to install it in the air above the rotor. Practical applications include installing one set on the rotor pedestal 2b or replacing the other, or installing two sets of the same model symmetrically on the left and right rotor pedestals 2a and 2b to improve efficiency by simultaneous work. It is natural that this will be done. When finishing the work for one stage of the rotor and moving to the next adjacent stage, the injection nozzle 32 is moved in the X-axis direction (in the case of the first embodiment).
Alternatively, move the self-propelled vehicle 20 to the end of the stroke in the Z-axis direction (in the case of the second embodiment), pull it out from the outer periphery of the rotor, and then move the self-propelled vehicle 20 in the injection nozzle 3
2, you can repeat this one by one to clean all the paragraphs.

The operation of the injection nozzle 32 and rotation of the rotor in this cleaning work are performed by programming the dimensions and the cleaning procedure in the control device in advance, since the dimensions of the rotor, which is the object to be polished, are known. By inputting information in advance, the entire cleaning operation can be automatically controlled.

〔Effect of the invention〕

According to the present invention, since the spray nozzle mounted on the self-propelled cart can be automatically cleaned by spraying the abrasive agent without moving along the surface of the object to be polished, many skilled This method eliminates the need for multiple workers and has the effect of significantly shortening the cleaning work time.

[Brief explanation of drawings]

FIG. 1 is a side view of a first embodiment of an automatic cleaning device according to the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is a plan view of FIG. 5 is a front view of FIG. 4, FIG. 6 is a plan view of FIG. 4, FIG. 7 is a partial detailed view of FIGS. 3 and 5, and FIG. The figures are cross-sectional views taken along the line 8--input in Figures 1 and 4, Figure 9 is an explanatory diagram of the method of moving the injection nozzle, Figure 10 is an explanatory diagram of the control method for the first embodiment, and Figure 11 is an explanatory diagram of the control method for the first embodiment. FIG. 2 is an explanatory diagram of a turbine rotor cleaning operation in the prior art. 1... Turbine rotor, 30... Injection nozzle device.

Claims (1)

[Claims] 1. In an apparatus for cleaning a multi-stage rotating body using high-speed jets, assuming three orthogonal axes X, Y, and Z axes including a horizontal X-axis and a Y-axis, the rotating body is a rotating body pedestal device rotatably supported; a rail laid in the X-axis direction; a self-propelled truck that runs on the rail; an abrasive spray nozzle mounted on the self-propelled truck; an abrasive supply device for supplying a spray nozzle abrasive, and an abrasive supply device that is mounted on the self-propelled cart, supports the spray nozzle, and moves along the surface of the rotating body while directing the spray nozzle toward the surface to be polished. An automatic cleaning device characterized by comprising a nozzle drive device for controlling the nozzle, and a control device for controlling the nozzle drive device. 2. A rotating body pedestal device that rotatably supports a rotating body, a rail laid in the X-axis direction on a support fixed on the rotating body pedestal device in the Z-axis direction, and a rail that extends on the rail. a self-propelled truck that travels; an abrasive spray nozzle mounted on the self-propelled vehicle; an abrasive supply device that supplies abrasive to the spray nozzle; 1. An automatic cleaning device comprising: a nozzle drive device that supports a rotor and moves the spray nozzle along the surface of a rotating body while directing the jet nozzle toward the surface to be polished; and a control device that controls these devices. 3. The injection nozzle is supported by a reversing device that rotates 180 degrees around a rotation center axis parallel to the Y axis, and has a neck that can be adjusted to any angle around the rotation center axis parallel to the Y axis. The automatic cleaning device according to claim 1, wherein the automatic cleaning device is supported via a swinging device. 4. The automatic cleaning device according to claim 1, wherein the spray nozzle is configured to be individually adjustable in the Y-axis direction and the Z-axis direction. 5. The injection nozzle is supported by a reversing device that rotates 180 degrees around a rotation center axis parallel to the Z axis, and can be adjusted to any angle around the rotation center axis parallel to the Z axis. The automatic cleaning device according to claim 2, wherein the automatic cleaning device is supported via a swinging device. 6. The automatic cleaning device according to claim 2, wherein the spray nozzle is configured to be adjustable in the Z-axis direction. 7. The automatic cleaning device according to claim 1 or 2, wherein the rotation of the rotating body to be polished is controlled by a rotating body pedestal device in association with the operation of the injection nozzle.