JP2796309B2 - Automatic honing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic homing apparatus which is effective for cleaning a large circular plate-shaped component such as a diaphragm for a steam turbine.

[Conventional technology]

In order to guide the steam flow to the multi-stage impeller installed in the rotor, the steam turbine has a nozzle-type steam flow path called a diaphragm, and a disk-shaped partition plate that is divided into two parts up and down on the diameter line. Provided for each paragraph, for example, 1100MW
There are as many as about one hundred and forty class turbines, each having a maximum diameter of about 5 m and a weight of about eight tons per radial piece. During periodic inspections of steam turbines (hereinafter abbreviated as regular inspections), turbine components are disassembled, cleaned and visually inspected for damage or nondestructively inspected. In particular, the diaphragm for nuclear turbines is in operation. It is necessary to perform decontamination work on the surface to be inspected, such as a steam flow and a steam flow path contaminated with radioactivity, and use a high-speed fluid such as water or air The so-called honing work is performed by spraying together with the spray, but the work is done manually by a worker wearing protective clothing in an isolation house to prevent radioactive materials from scattering into the surrounding air. And have been subjected to severe work for a long period of time in a poor working environment. Figures 12 to 14
The figure shows a conventional working method, in which the turbine high-pressure compartment HP, the first low-pressure casing ALP, the second low-pressure casing BLP, and the third low-pressure casing C
At the time of regular inspection, the diaphragm 1 incorporated in each compartment of the LP is lifted by the overhead crane 2, and the diaphragm 1 is placed on the fixed diaphragm receiving base 3 so that the working space 4 is obtained, and the honing work is performed. Occasionally, an operator enters the dust scattering prevention isolation house 6 and performs a honing operation manually for each diaphragm. Disadvantages of such conventional methods are firstly the working environment is inferior and harsh, and secondly, a large amount of man-hours are required for honing a large number of diaphragms because they are all manual.

[Problems to be solved by the invention]

The present invention provides a dedicated machine that automatically performs a honing operation in order to release a worker from a poor working environment and to shorten an excessively long operation period.

[Means for solving the problem]

In order to achieve the above object, a honing device of the present invention includes a self-propelled device that moves in the direction in which the diaphragm is installed, and a connecting portion between the self-propelled device and one end connected to the self-propelled device. A first connecting rod device that swings in a plane substantially perpendicular to the direction in which the diaphragms are juxtaposed, and a connecting portion between the first connecting rod device having one end connected to the other end of the first connecting rod device A second connecting rod device that swings in a plane substantially perpendicular to the direction in which the diaphragms are attached to each other with the fulcrum as a fulcrum, and moves in the direction in which the diaphragms are connected to the second connecting rod device and is connected to the second connecting rod device. An injection nozzle device, and an injection nozzle that is connected to the injection nozzle device and has a plurality of injection ports each of which injects an abrasive in a different direction, and that itself rotates around a connection portion with the injection nozzle device as a fulcrum, [Function] of the present invention The dynamic honing apparatus body by placing the rail frame for causing the self-propelled movement on top of the diaphragm receiving base frame,
The connecting frame attached to the self-propelled main body is rotated between adjacent diaphragms to adjust the length of the connecting rod according to the diameter of the surface to be polished, or to control the bending angle of the joint. Then, the injection nozzle is rotated in accordance with the change in the shape of the portion to be polished, and the injection nozzle is inverted for polishing the opposite side of the diaphragm. The interlocking of these operations is performed by programming the most efficient operation procedure to the control device, and giving the most efficient operation procedure to the control device because the shape and size of each diaphragm is unique to each paragraph number and is determined in advance. Complete lapping work can be automatically and continuously performed on the entire required lapping area for multiple diaphragms with different dimensions and shapes.

〔Example〕

FIG. 1 is a perspective view showing the outline of the apparatus of the present invention, the main parts of which are a rail base 10, a self-propelled apparatus 20, an articulated connecting rod apparatus 3.
0, an injection nozzle reversing device 40, an injection nozzle position adjusting device 50, an injection nozzle device 60, and a control device (not shown). An abrasive supplied together with compressed air from an abrasive supply device (not shown) passes through a blast hose 61 shown in FIGS.
a, sprayed on the diaphragm DF ₁ from 64b. In the case of this embodiment, the motor 66 drives the flow path 62 through the gears 65a and 65b.
Is rotated and the nozzles 64a and 64b connected to the shaft are rotated, so that the abrasive sprayed from the nozzles is sprayed 360 degrees to the polishing point of the diaphragm in all directions. On the other hand, Ken掃剤when the swing nozzle system shown in Figure 4 is supplied to the blast hose 71, the nozzle 72 together with the holder 74 by the horizontal swing motor 73 injected from the nozzle 72 as indicated by the arrow theta _X horizontally swinging the nozzle 72 by the vertical swing motor 75 is vertically swung as indicated by an arrow theta _Y. Fig. 1 and 2
Two of the connecting rod 31, 33 to the injection nozzle along the HiKen掃面diaphragm DF ₁ to exercise in figure self device 20
The first joint is controlled to rotate by a motor 32 and the second joint is controlled to rotate by a motor 34, and by performing a combination control of the two, a desired cleaning operation is performed by a predetermined program. . In FIG. 1 and FIG. 2, in order to turn the injection direction of the nozzle in the opposite direction to the illustration, as in the case where the right side of the diaphragm DF ₂ is polished,
A reversing device 40 for rotating the entire nozzle portion by 180 degrees by a reversing motor 41 is provided.

The cross-sectional shape of the diaphragm is generally as shown in Fig. 5. The inner ring 1a, outer ring 1b, and diaphragm nozzle wing 1c have steps. May not provide sufficient cleaning effect.
For such a case, a nozzle position adjusting device 50 is provided as shown in FIGS. 2, 4 and 5, and the parallel link mechanism is operated by the motor 51 so that the nozzle axis is aligned with the connecting rod axis. The distance from the axis of the connecting rod to the tip of the nozzle can be adjusted while maintaining the right angle. In the case of FIG. 5, the outer ring portion 1b is polished in the state shown in b, and the diaphragm nozzle wing 1c is moved to the right side as shown in c to perform blasting. , spraying distance Y ₂ is almost approximate values as Y ₁ becomes Y _4, be made blast effect of also approximation Dekakiru.

FIG. 6 is a perspective view of the lower diaphragm, FIG. 7 is a view taken along the line VII-VII of FIG. 6, and FIG. 8 is a sectional view taken along the line VIII-VIII of FIG. FIG. 8 (a) shows a state in which the nozzle is blasted by spraying from an arbitrary direction effective according to the curved surface of the diaphragm nozzle blade portion 1c by the swinging nozzle system (FIG. 4), and FIG. FIG. 1C shows a spray-cleaning state for the portion 1a and the outer ring 1b, and FIG.
FIG.

At the time of regular inspection of the nuclear turbine, the diaphragm is set upright on a predetermined receiving stand as shown in FIG. 14, and prior to the start of the honing operation, the complete set of the present invention is mounted on the receiving stand frame 3 as shown in FIG. Put on top. FIG. 9 is a state diagram for honing the lower half diaphragm, and points A, B, C, D, E, F, A
The range surrounded by is the cleaning range. Corresponding to the points A to F, the two connecting rods 31 and 33 perform the sweeping while sweeping the entire target range while changing to the state shown by a thin line. FIG. 10 is a work state diagram for the upper half diaphragm, and the operation procedure is the same as in FIG. However, the tenth
In the case of the figure, two long connecting rods are required as compared with the case of FIG. That is, the length ▲ ▼ from the first joint R point to the farthest point A in FIG. 10 is longer than the length ▲ ▼ to the farthest point F point in the case of FIG. For this reason, the connecting rods 31 and 33 can be extended and contracted (not shown).

FIG. 11 shows an example in which an elevating device 80 for raising and lowering the first joint R point is provided in order to share the two connecting rods 31 and 33 with the upper half and the lower half diaphragm while keeping the fixed length. The upper half of the upper half diaphragm and the upper half of the upper diaphragm are moved by the lifting device to the first joint at the upper end R, and the lower half of the upper half diaphragm (points A _{U to} E _U and the vicinity thereof) is moved. The work is performed by lowering the first joint point R to the lower end R 'position by the lifting device. According to this method, the length of the connecting rod is required to be the minimum necessary for various diameters to be worked, and the entire apparatus can be reduced in size and cost.

In the above description, a single set of honing devices has been described. However, as shown in FIG. 1, a plurality of sets of honing devices can be mounted on the rail mount 10 in the longitudinal direction thereof. Depending on the number of diaphragms arranged upright in parallel, the operation time can be shortened by operating a plurality of sets of honing devices simultaneously. In addition, the explanation of the equipment for preventing dust scattering to the surroundings and the equipment for collecting the honing agent during the honing work has been omitted, but it is without controversy that related auxiliary equipment similar to the related art is provided.

〔The invention's effect〕

ADVANTAGE OF THE INVENTION According to this invention, labor saving is achieved by greatly shortening the working time and releasing the operator from the poor working environment, and the regular inspection period of the turbine plant is shortened.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of one embodiment of the present invention, and FIG.
FIG. 3 is a plan view of the drawing, FIG.
FIG. 5 is an explanatory view of a swing type nozzle system, FIG. 5 is an explanatory view of a nozzle position adjusting device, FIG. 6 to FIG.
FIG. 12 to FIG. 14 are explanatory diagrams of the conventional method. 1 ... diaphragm, 3 ... diaphragm support, 10 ...
Rail stand, 20 …… Self-propelled device, 30 …… Linked rod device, 40 ……
Nozzle reversing device, 50 ... Nozzle position adjusting device, 60 ... Rotary injection nozzle device, 70 ... Swinging injection nozzle device.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shinobu Mashiko 1-15-1 Higashi-Onumacho, Hitachi City, Ibaraki Prefecture Within Hitachi Power Engineering Co., Ltd. (56) References JP-A-60-208532 (JP, A) JP-A-55-109482 (JP, A) JP-A-60-13086 (JP, A) JP-A-60-229836 (JP, A) JP-A-58-129112 (JP, A) JP-A-62-95786 (JP, A) , U) Japanese Utility Model Showa 60-67184 (JP, U) Japanese Utility Model Showa 55-122886 (JP, U) Japanese Patent Publication 52-6826 (JP, B2) Japanese Utility Model Showa 51-47400 (JP, Y2) (58) Field surveyed (Int.Cl. ⁶ , DB name) B08B 1/00-11/04

Claims (1)

(57) [Claims] 1. A honing device for cleaning a plurality of diaphragms provided in parallel, a self-propelled device moving in a direction in which the diaphragms are provided, one end of which is connected to the self-propelled device, and a connection portion with the self-propelled device. A first connecting rod device that swings in a plane substantially perpendicular to the direction in which the diaphragms are provided with a fulcrum as a fulcrum, one end of which is connected to the other end of the first connecting rod device; A second connecting rod device that swings in a plane substantially perpendicular to the direction in which the diaphragms are attached to each other with a connection portion with the device as a fulcrum, and is itself connected to the second connecting rod device, and is connected to the second connecting rod device, substantially An injection nozzle device that moves in the direction in which the diaphragms are installed, and a plurality of injection ports that are connected to the injection nozzle device and that each spray an abrasive in a different direction, and are themselves connected to the injection nozzle device. Pivot around the fulcrum Honing apparatus characterized by having a nozzle morphism.