JP2000136702A - Turbine rotor automatic blast device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple automatic blast device for working environment improvement, working load reduction, efficiency improvement and working quality standardization in turbine blast cleaning work. SOLUTION: This device includes a blast machine 1 connected to a cleaning material recovery tank 8, an automatic blast device 3 equipped with a rotary nozzle 4 connected to the blast machine 1 through a blast hose 2, a vinyl house A covering a turbine rotor 5 to be cleaned and a cleaning material recovery device 6 arranged at a bottom of the vinyl house A. The automatic blast device 3 supports the rotary nozzle 4 movably in three directions X, Y and Z. The cleaning material recovery device 6 is connected to the cleaning material recovery tank 8 and a cleaning material recovery line 7 to recycle cleaning materials.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turbine rotor automatic blast apparatus.

[0002]

2. Description of the Related Art Periodic inspections at nuclear power plants are performed about once a year. Steam turbines are checked once every two periodic inspections
Open inspections such as "rotor" and "diaphragm" are conducted at the rate of the number of times. In this release inspection, soundness is confirmed by a nondestructive inspection or the like, but oxides such as rust adhere to the entire surface of the rotor and the diaphragm after use for one to two years. For this reason, a cleaning operation by blast is performed in order to remove the attached oxide and make it possible to perform a nondestructive inspection.

[0003] The blast cleaning is to blow a fine powder (abrasive material) having a grinding force onto an object with compressed air or the like to remove contaminants and the like adhering to the surface. Up to now, except for a small part of the work, a manual method in which an operator holds and cleans the blast nozzle by hand has been mainly used.

In the blast cleaning operation, an object to be cleaned is sealed in a temporary plastic greenhouse or the like so that dusts such as abrasives are not scattered to the outside. Positive pressure is generated due to expansion of the compressed air, etc., and the abrasive material leaks out, contaminating the outside. Therefore, a local exhaust fan or the like is installed and driven to purify and exhaust air and the like in the house, and is maintained at a negative pressure to prevent leakage of dust and the like. Workers wear protective clothing worn on the airline in dusty and environmental houses, have blast nozzles and lighting, and perform blasting work in narrow spaces between turbine blades for a long time.

[0005]

SUMMARY OF THE INVENTION The present invention relates to an automatic turbine rotor blasting apparatus which is capable of improving the environment of a turbine blast cleaning operation and standardizing the cleaning operation mainly in a nuclear power plant. This equipment can be used for existing equipment that is currently used for periodic inspections (for example, it can be installed and used without any changes to the rotor rotating stand, aluminum house, blast machine, local exhaust equipment, etc., and regular inspection process). In addition, the present invention provides a device capable of performing a reworking operation even during automatic driving. In addition, a rotary nozzle designed to be able to clean the entire surface of a complicatedly curved blade such as a turbine rotor will be submitted.

[0006]

A blasting machine 1 connected to a polishing material recovery tank 8, an automatic blasting machine 3 having a rotary nozzle 4 connected to the blasting machine 1 by a blast hose 2, and a turbine rotor 5 With a greenhouse A covering
It comprises an abrasive material recovery device 6 provided at the bottom of the greenhouse A. The automatic blasting device 3 moves and sets the rotary nozzle 4 between each stage of the turbine rotor, moves the main frame 12 vertically two-dimensionally to perform a cleaning operation, and collects the abrasive material accumulated at the bottom by the collecting device 6. Then, it is transferred to the collection tank 8 by the collection line 7. The polishing material can be circulated to perform a straight blasting operation.

The rotary nozzle 4 for cleaning the turbine rotor 5 is composed of a main body frame portion 12 to which the rotary nozzle 4 is fixed and a rotary portion 13.
A driving bevel gear 15 and a rotating bevel gear 16 meshing therewith are provided by an air motor 14, and a pair of nozzles 17 attached to the rotating bevel gear 16 via a nozzle replacing unit 20. The rotary bevel gear 16 is fixed by an exchange bolt 18, and is positioned on the main body frame portion 12 by a bearing 19.

A pair of nozzles 17 and a nozzle replacement bolt 18
The nozzle replacement unit 20 including the above facilitates the setting change by changing the “nozzle angle θ _{1 with} respect to the rotation axis” of the nozzle.

A rotating seal 21 is attached to the rotating portion 13 to prevent leakage of the cleaning material during rotation.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Automatic Blasting Apparatus Main Body) Referring to FIG. 1, the flow of an abrasive material and an automatic blasting apparatus including an abrasive material collecting apparatus according to the present invention will be schematically described. First, in FIG. 1, the blasting material carried in the blast hose 2 by the compressed air from the blasting machine 1 reaches the rotating nozzle 4 of the automatic blasting device 3 and the turbine rotor 5
Blasting work to. This system also collects abrasive materials at the same time as automatic blasting. The abrasive material sprayed from the rotary nozzle 4 is collected by an abrasive material recovery device 6 installed on the floor, passes through an abrasive material recovery line 7, and is collected in an abrasive material recovery tank 8 at the top of the blast machine 1. Can be

The blasting material collected in the blasting material recovery tank 8 is supplied to the blasting machine 1 through a connection pipe or the like, and a continuous blasting operation becomes possible.

Next, the structure of the main body of the automatic blasting apparatus will be described with reference to FIG. As preparation work, the turbine rotor 5
An X-axis running rail 9 running in the longitudinal direction is laid, and movement in the X-axis direction is performed by an electric motor. The automatic blasting device 3 has three axes of X-axis, Y-axis, and Z-axis. The X-axis direction can be moved by manual operation as described above, and the simple X-axis that can automatically operate in the Y-axis and Z-axis directions. It has the structure of a Y-shaped robot. At the time of operation of the apparatus, 9 stages of the turbine rotor 5 to 1
Each time, it moves on the X-axis running rail 9 to a position where the Y-axis moving rail 10 can be inserted between each of the seven stages, and the positioning is performed.

After the automatic start, the rotary nozzle 4 moves in the Z-axis (vertical direction) and Y-axis (horizontal direction) operations according to the program, and about 1/4 of the lower semicircle portion of the rotor blade (to the full circle). T). The operating ranges of the Z axis and the Y axis can be set so as to substantially follow the shape of the wing.

(Rotating Nozzle Body) Next, the configuration of the rotating nozzle 4 will be described with reference to FIG. The abrasive material that has reached the rotary nozzle 4 from the blasting machine 1 is divided into a “left-side abrasive material flow a” and a “right-side abrasive material flow b” at a branch portion 11 provided inside the rotary nozzle 4. It is blown out from the left and right nozzle tips.

As shown in FIG. 4, the rotary nozzle 4 includes a main body frame portion 12 and a rotary portion 13 of the rotary nozzle 4. The main body frame portion 12 is a support portion of the rotary nozzle 4. The rotating part 13 rotates the driving bevel gear 15 by the output shaft of the air motor 14, and the nozzle 17 attached to the rotating bevel gear 16 meshing with the driving bevel gear 15 via the nozzle replacement unit 20 turns. The nozzle 17 is fixed by a nozzle replacement bolt 18 of the nozzle replacement unit 20, and can be easily replaced by loosening the nozzle replacement bolt 18. The rotating bevel gear 16 is positioned by a bearing 19 installed on the main body frame portion 12, so that stable rotation can be obtained.

The setting of the nozzle replacement unit 20 including the nozzle 17 and the nozzle replacement bolt 18 can be easily changed by changing the “nozzle angle θ _{1 with} respect to the rotation axis” (FIG. 6) at the nozzle tip.

Further, since the rotating part 21 is provided with the rotating seal 21, there is no damage to the bearings and the like during operation.

(Method of Sealing Nozzle 4) Rotary Seal 21
Uses a special resin to seal the blast material (ultra-hard blast material such as alumina) for a long time.

[0019]

(1) Except for the movement in the X-axis direction, the Y-axis and Z-axis
Since the movement in the axial direction is automatic, improvement in working efficiency can be expected. That is, due to the structure of the rotary nozzle, blasting and cleaning can be performed simultaneously in two directions, so that the working efficiency is increased. (2) A structure capable of simultaneous blasting in two directions in the left and right directions by a pair of rotary nozzles has an effect of reducing blast reaction force or reducing nozzle vibration due to rotation and reaction force during rotary blast. (3) Lightweight and compact structure allows insertion into narrow spaces Turbine cleaning of turbine rotors is difficult due to the small spacing between the blades at each stage of the rotor. Wings are no longer damaged by accidents. (4) Mechanization or jigs can be used, and the blast cleaning operation quality can be made uniform and standardized.

[Brief description of the drawings]

FIG. 1 is a working system diagram of the automatic blasting device of the present invention.

FIG. 2 is an overall view of an automatic blasting apparatus.

FIG. 3 is an enlarged schematic view of a flow passage changing portion inside the rotary nozzle.

FIG. 4 is a schematic general view of a rotary nozzle.

FIG. 5 is a view showing a nozzle replacement method.

FIG. 6 is an explanatory view of a nozzle unit replacement method and a nozzle angle with respect to a nozzle rotation axis.

FIG. 7 is a diagram of a conventional work method system.

FIG. 8 is a schematic view of a known rotor blast operation.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Blasting machine 2 Blast hose 3 Automatic blasting device 4 Rotating nozzle 5 Turbine rotor 6 Abrasive material recovery device 7 Abrasive material recovery line 8 Abrasive material recovery tank 9 X-axis running rail 10 Y-axis rail 11 Branch part 12 Main body frame 13 Rotating part 14 Air motor 15 Drive bevel gear 16 Rotating gear 17 Nozzle 18 Nozzle replacement bolt 19 Bearing 20 Nozzle replacement unit 21 Rotary seal

Claims (4)

[Claims] 1. An automatic blasting machine comprising a blasting machine (1) connected to a polishing material recovery tank (8) and a rotary nozzle (4) connected to the blasting machine (1) by a blast hose (2).
(3), a plastic greenhouse (A) covering the turbine rotor (5) to be cleaned, and an abrasive material recovery device (6) provided at the bottom of the plastic greenhouse (A), and the automatic blasting device ( 3)
Supports the rotary nozzle (4) so as to be movable in three directions of X, Y, and Z, and connects the polished material collecting device (6) to the polished material collecting tank (8) and the polished material collecting line ( An automatic blasting device for a turbine rotor, wherein the blasting device is tied in 7) to be used in circulation. 2. The rotary nozzle (4) for polishing a turbine rotor (5) comprises a main body frame (12) to which the rotary nozzle (4) is fixed and a rotary part (13). part
(13) is a driving bevel gear (15) and a rotating bevel gear (16) meshing with the driving bevel gear (15) by an air motor (14), and a pair of nozzles attached to the rotating bevel gear (16) via a nozzle exchange unit (20). 1
7), and the pair of nozzles (17) includes a nozzle replacement unit (2).
0) is fixed by a nozzle replacement bolt (18), and the rotary bevel gear (16) is a bearing (19) of the main body frame (12).
The turbine rotor automatic blasting device according to claim 1, wherein the blasting device is positioned by: 3. A pair of nozzles (17) and a nozzle replacement bolt (1).
3. The automatic turbine rotor blasting device according to claim 2, wherein said nozzle replacement unit (20) including (8) facilitates setting change by changing a nozzle "nozzle angle [theta] _{1 with} respect to a rotation axis". 4. The turbine rotor automatic blasting device according to claim 3, wherein a rotating seal is mounted on the rotating portion to protect the rotating member from damage caused by the abrasive material during rotation.