JP2003028980A - Device for replacing baffle former bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the time for replacement work on fitting bolts and enhance efficiency during regular inspection periods in the power plant as a whole. SOLUTION: A body 1 of a device for replacing baffle former bolts is in a compact manner, composed of a Z-axis mechanism, an X-axis mechanism, a Y-axis mechanism, a ϕ-axis (rotation) mechanism, a device for recovering chips, a beam using the device for replacing the bolts as a guide axis and the like, so that the positions, where the baffle former bolts are replaced, can be set easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for replacing a baffle former bolt for fastening a baffle plate and a baffle mounting plate which constitute a baffle unit of a lower reactor core in a reactor containment vessel.

[0002]

2. Description of the Related Art FIG. 20 shows a baffle plate 202 and a baffle mounting plate 203 of a lower core vessel 201 of a reactor vessel.
It is a perspective view showing the situation formed by and. Figure 21
FIG. 21 is a cross-sectional view showing cross-sections AA of FIG. 20. FIG. 22
21 is an enlarged view of a portion B in FIG. 21 and shows a fastening portion between the baffle plate 202 and the baffle mounting plate 203 and the baffle plate 202b.
It is sectional drawing which shows the fastening part of the baffle board 202c adjacent to. The baffle plate 202 and the baffle mounting plate 203 of the lower core plate 201 are installed on the lower core plate 206,
It forms the boundary of the core. Baffle plate 202
Baffle former bolts 204 and 205 (hereinafter collectively referred to as mounting bolts 205) are used for the fastening portion between the baffle mounting plate 203 and the baffle mounting plate 203 or the fastening portion between the baffle plate 202b and the adjacent baffle plate 202c. Due to the structure of the reactor core 201, the fastening portion between the baffle plate 202 and the baffle mounting plate 203 has various types such as the height position of the baffle mounting plate 203, the direction of the mounting bolt, and the mounting bolts used. The number of 205 reaches 728. Therefore, replacement work of the mounting bolt 205 is not easy.

[0003]

Conventionally, in the reactor vessel, as a measure for confirming the soundness of the reactor vessel, regular inspection (constant inspection) is carried out.
No. 5 was not inspected, and it was determined that the mounting bolts 205 should be replaced from the viewpoint of preventive maintenance after the core core configured as described above has undergone the elapsed operation. The number of these mounting bolts is about 700 to 1000, and the replacement work within the limited regular inspection period and the setting work of the replacement device in the radioactivity control area are one of the important issues, and the reduction of time is a problem. It is being seen. In view of the above, the present invention aims to shorten the time for replacing the mounting bolts and to improve the efficiency of the regular inspection period of the entire plant.

[0004]

In order to achieve the above object, a baffle former bolt replacing device of the present invention has a Z-axis mechanism for vertically moving a carriage base plate and an X provided on the carriage base plate. An X-axis mechanism that moves the shaft plate left and right, a Y-axis mechanism that moves the moving hardware provided on the X-axis plate back and forth, and a baffle former bolt that is attached and detached provided on the moving hardware. It is characterized by comprising a shaft mechanism and a chip collecting device for collecting foreign matter such as chips generated when the baffle former bolt is attached and detached.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention has the following structure in order to solve the above problems. 1. Overall Configuration of Baffle Former Bolt Replacement Device In FIGS. 1 and 2, a baffle former bolt replacement device main body 1 uses a beam 3 installed on a lower core plate 2 as a guide shaft and a guide roller portion 4 to A Z-axis mechanism 6 configured to move the carriage base plate 5 up and down, and an X which horizontally moves the front surface of the carriage base plate 5.
The axis mechanism 7, the Y-axis mechanism 8 configured to move on the front surface of the carriage base plate 5 at a right angle to the direction of the X-axis mechanism 7 (perpendicular to the paper surface of FIG. 1), φ used for attaching and detaching the baffle former bolt The apparatus includes a shaft (rotation) mechanism 9, a chip collecting mechanism 12 having an expandable angular duct for vacuuming foreign matter such as chips when the baffle former bolt is attached and detached by a separate means.

2. Z-axis mechanism As shown in FIGS. 3, 4 and 5, the Z-axis mechanism 6 uses the beam 3 installed on the lower core plate 2 as a guide axis and moves the carriage base plate 5 up and down via the guide roller section 4. It is composed of. As a transmission method, it is composed of a worm wheel and a rack and pinion. The actuator uses an AC servomotor, and is connected to the carriage base plate 5 by a connecting portion 16. A rack and pinion unit 2 disposed on the carriage base plate 5 by connecting a worm wheel unit 19 to a servo motor shaft 18 provided inside the Z-axis drive unit 17.
Pinion 2 that connects 0 gear 21 and meshes with gear 21
Racks 24 provided on the guide roller unit 4 from 2, 23
Is meshed with. Further, a resolver detector R that detects the rotation speed of the servo motor is used at the lower end of the servo motor shaft 18.

Further, the guide roller portion 4 is provided with a roller 26 for rolling the roller receiving portion 25 provided on the beam 3, and the beam is passed through the rack and pinion portion 20 by the drive of the Z-axis drive portion 17. It is formed so as to go up and down over the entire length of 3. Further, a hard stop portion 27 is provided below the guide roller portion 4, and two roller receiving portions 25 are provided.
The outside of the press is always crimped by a crimping metal fitting 28 to hold the set position of the guide roller portion 4. When the crimping metal fitting 28 is not opened, the hydraulic cylinder 29 of the hard stop portion 27 is moved in the direction of arrow a. Shaft 30 when pulled up in the direction
With lever 31 as a fulcrum, lever 32 fulcrum 33
Is rotated in the direction of arrow B using the
It is formed so that the crimping metal fitting 28 that has been crimped is opened by the shaft 34 in the direction of C. Also, for constant pressure bonding,
The disc spring 35 is used.

3. X-axis mechanism The X-axis mechanism 7 is formed so that the X-axis plate 41 moves laterally on the front surface of the carriage base plate 5, as shown in FIGS. 6 and 7. As a transmission method, the gear 4
3, 44 and a ball screw 45. The actuator uses an AC servomotor 42 and is installed on the carriage base plate 5. In addition, the X-axis plate 41
2 are installed above and below the carriage base plate 5.
It slides through the first linear ways 47a and 47b of the strip. AC servomotor 42 Ball screw 45 connected to gear 44 via gear 43 connected to shaft
Is formed so that the X-axis plate 41 connected to the moving hardware 46 can be moved left and right by a total stroke of 410 mm. Further, the metal fitting 48 is provided on the carriage base plate 5, and the hydraulic fixing device 4 is provided at two central portions of the X-axis plate 41.
9 is provided so that the X-axis plate 41 can be fixed at a predetermined position. Further, in order to prevent the X-axis plate 41 from overstroke, the stopper 50 is attached to the carriage base plate 5.
It is provided on both sides of. In addition, the AC servo motor 42
Resolver detector R for detecting rotation on ball screw 45
Are using.

4. Y-axis mechanism As shown in FIGS. 8 and 9, the Y-axis mechanism 8 is based on a box-shaped metal piece 55 arranged on the X-axis plate 41, and a moving metal piece 56 is perpendicular to the direction of the X-axis mechanism 7 (see FIG. (Vertical to the paper surface of) is a mechanism configured to move. The actuator has hydraulic cylinders 57 arranged on both sides of the box-shaped metal piece 55, and a movable metal piece 56 is formed so as to be able to move a stroke of 130 mm via three second linear ways 58 arranged below the box-shaped metal piece 55. is there. Further, a resolver detector R that detects the moving distance is used for the hydraulic cylinder 57.

5. φ-Axis (Rotation) Mechanism The φ-axis (rotation) mechanism (hereinafter referred to as φ-axis) 9 is a mechanism used for attaching and detaching the baffle former bolt, as shown in FIGS. The actuator is a box-shaped hardware 5.
The hydraulic motor 61 arranged on the upper base plate 59 of No. 5 is used. The pneumatic cylinder 62 is used for switching the rotation speed. The pneumatic cylinder 64 is used to move the rotary shaft 63.

The transmission method will be described in detail below. Rotation to the upper shaft 73 is transmitted by the bevel 72 that is orthogonal to the bevel 71 attached to the hydraulic motor shaft 70. A gear (large) 74 and a gear 75 (small) are mounted on the upper shaft 73. Then, a clutch switching hardware 76 formed so as to slide on the upper shaft 73 is attached to substantially the middle thereof,
It is sandwiched by a clutch 78 mounted on the lower shaft 77. Further, the gear (large) 79 and the gear (small) 80 rotatably mounted on the lower shaft 77 are respectively the above-mentioned gear 7
5 (small) and gear 74 (large) are mounted in inverse proportion to the size. The clutch 78 slides on the lower shaft 77 in the axial direction so as to be able to mesh with any of the gears 79 and 80, and also to be idle. Since it is formed as described above, the upper shaft 7
The rotation speed transmitted from 3 to the lower shaft 77 is, for example, the gear 7
If you go through 4, 80 and clutch 78, it will be high speed,
The speed becomes low when passing through the gears 75 and 79 and the clutch 78.

The clutch switching hardware 76 is operated by being connected to the hardware 81 by a pneumatic cylinder 62 installed on the upper base plate 55. Then, the rotation is transmitted from the gear 82 mounted on the lower shaft 77 to the gear 83 below.

The gear 83 is formed so as to slide on a shaft 84 formed in a spline shape and move by an adjacent pneumatic cylinder 64 while transmitting rotation from the gear 85 to the gear 87. The travel distance can be 130 mm in stroke.

The end of the rotary shaft 63 where the gear 87 is not mounted is formed with a replaceable bolt so that the adapter can be replaced. Further, they are formed symmetrically with respect to the shaft 84. In addition, the hydraulic motor 61 and the lower shaft 77
A resolver detector R that detects shaft rotation is used at the end of the.

6. Chip Collecting Device As shown in FIGS. 12, 13, 14 and 15, the chip collecting device 12 is a substantially rectangular flat bottom type receiving box (hereinafter referred to as a tray).
The left corner duct 102L and the right corner duct 102R which are formed in 101 and have a rectangular sectional shape along both left and right ends.
Is bent and guided to the tip.

Square ducts 103L and 104L are connected to the tip of the left-side square duct 102L, the square duct 103L is formed so that it can be stored in the square duct 102L, and the square duct 104L is formed so that it can be stored in the square duct 103L. ing. Therefore, the square ducts 103L and 104L are movable and are formed to be expandable and contractable in the longitudinal direction.

Further, the connecting rod 105 is provided in the square duct 103L.
L is attached, and the connecting rod 106L is attached to the square duct 104L to prevent removal in the longitudinal direction. Further, the square duct 104L is provided with a pin 110L at the center of the U-shaped metal fitting 109L for manually moving the square duct.

Further, a coupler 107L is attached to the rear of the square duct 102L, a vacuum device hose (not shown) is connected to the coupler 107L by a separate means, and a mounting bolt is attached from the opening 108L at the end of the square duct 104L. It is formed so as to vacuum the chips, the dust of the brushing and the flushing by a separate means, and the like.

Further, the right-sided corner ducts 102R to 110R
Are formed symmetrically with the above-described left-sided corner ducts 102L to 110L. That is, the square duct L side and the square duct side are formed oppositely, and the drive shafts 63R and 6R of the φ-axis device described above are formed.
It is used according to the convenience of use of 3L. Further, in case of using either one of the right and left corner ducts, it is formed so as to be attachable / detachable by a fixing fitting 111R (111L) which fixes the corner duct 102R (102L).

A lip rubber 112 is attached to the tip of the tray 101, and is used when the tray 101 is bottomed or when the tray 1 is attached.
01 tip end portion is closely contacted with the furnace internal structure, and leakage of dust or chips is formed as much as possible. Further, a mesh 113 is put on the entire cutout portion above the tray 101 to prevent dust or chips from scattering.

7. Beam Beam 3, as shown in FIGS. 16, 17, 18 and 19, has a substantially rectangular flange portion 1 at both upper and lower ends of a hollow tube 131.
32 is welded, the metal parts 133 and 134 are attached across the flange parts 132 at both ends, and the roller receiving parts 25 are provided at both ends of the metal part 134. In addition, the rack 2 on the inner surface of one side
It is a columnar shape to which 4 is attached. Then, the upper and lower flange portions 132 are connected with bolts and several pieces are set and used.

The underwater camera 135 and the illuminating light 13 are attached to the legs of the beam 3 which is used at the bottom of the beams 3.
6 is equipped with an adjusting bolt 141 called a preload in a fixing pin hole 140 previously provided in the lower core plate 2 while observing a monitor (not shown) by a separate means. There is.

[0023]

According to the present invention described above, the following effects can be obtained. 1. Baffle former bolt replacement device overall configuration The baffle former bolt replacement device body 1 includes a Z-axis mechanism, an X-axis mechanism, a Y-axis mechanism, a φ-axis (rotation) mechanism, and a chip collecting device. Since this device is compactly configured by a beam having a guide shaft, it is easy to set the baffle former bolt to the replacement position.

Further, by using the present apparatus configured as described above, due to the structure of the reactor core, various positions such as the height position of the baffle plate and the baffle mounting plate, the direction of the mounting bolt,
Replacement work at various locations is possible easily. Therefore, conventionally, it is possible to shorten the replacement work within a limited regular inspection period, the setting of the replacement device in the radioactivity control area, and the bolt replacement work time.

Further, resolver detectors are provided on the Z-axis mechanism servomotor, the X-axis mechanism servomotor and ball screw, the Y-axis mechanism hydraulic cylinder, the φ-axis (rotation) mechanism hydraulic motor, and the lower shaft, respectively. Since this is used, it is possible to fasten the bolt in accordance with the set torque of the replacement bolt.

2. Z-axis mechanism The Z-axis mechanism has a beam installed on the lower core plate as a guide shaft, and is formed so that the carriage base plate moves up and down via a guide roller portion.
Since the wheel, the rack and pinion, and the rack and pinion gear provided on the carriage base plate and the rack provided on the guide roller portion are used, the apparatus main body can be easily moved up and down.

Further, a hard stop portion is provided below the guide roller portion, and the outside of the roller receiving portion can be constantly crimped by a crimping metal object to hold the set position of the guide roller portion, and set the position of the predetermined position. Will be certain.

3. X-axis mechanism Since the X-axis mechanism uses the first linear way installed on the carriage base plate, the X-axis plate can be easily moved left and right. Since the hardware is provided on the carriage base plate 5 and the hydraulic fixing device is provided at the center of the X-axis plate, the X-axis plate can be fixed at a predetermined position.

4. Y-axis mechanism The Y-axis mechanism is based on a box-shaped metal piece arranged on the X-axis plate and uses the second linear way, so that the movable metal piece can be easily moved.

5. φ-axis (rotation) mechanism In the φ-axis (rotation) mechanism, a gear (large) and a gear (small) are mounted on the upper shaft that is orthogonal to the hydraulic motor shaft, and approximately in the middle,
A gear (large) and a gear (small) rotatably mounted on the lower shaft are fitted with a clutch switching hardware formed to slide on the upper shaft, engaged with a clutch mounted on the lower shaft,
Since the size is mounted in inverse proportion, the rotational speed transmitted from the upper shaft to the lower shaft can be transmitted at high speed and low speed via the clutch. Further, the end portion where the shaft gear is not mounted can be used in a wide range because the adapter is formed by the shape of the replacement bolt so as to be replaceable. Also,
Since it is formed symmetrically about the central axis, it can be used in the opposite direction.

6. Chip Collecting Device The chip collecting device is formed on a substantially rectangular flat-bottomed tray, and right and left rectangular ducts having a rectangular cross-section are bent along both left and right ends and are guided to the front end. The square ducts connected to the distal end portions are formed so as to be housed in the front side square duct, respectively, and are movable and extendable and contractible in the longitudinal direction. Also, a connecting rod is attached to each corner duct at the tip,
Prepared for prevention of pulling out in the longitudinal direction. In addition, a pin is provided in the central portion of the U-shaped metal fitting in the square duct so that the square duct can be manually moved. In addition, a coupler is attached to the rear of the square duct, and a hose for a vacuum device by a separate means is connected to the coupler, and from the opening at the end of the most advanced square duct,
It is formed so as to vacuum the chips from the mounting bolts, dust by brushing and flushing by a separate means, and the like. Further, since the tray is in the shape of a rectangular tray with a wide front end portion, is made easy to receive chips and the like, and is provided with a vacuum means, foreign matters are not left behind.

Further, the right-sided corner duct is formed symmetrically with the above-mentioned left-sided corner duct. As described above, the square duct L side and the square duct R side are oppositely formed, and
The shaft device is effectively and widely used corresponding to the convenience of use of the drive shaft. Further, in case of using either one of the left and right corner ducts, it is formed so that it can be easily attached and detached by the fixing metal fittings that fix the corner ducts.

Further, a lip rubber is attached to the tip of the tray, and when the tray is bottomed or the tip of the tray and the furnace internal structure are in close contact with each other, the leakage of dust or chips can be minimized. In addition, a mesh is put over the entire cutout portion above the tray, which is effective in preventing dust or chips from scattering.

7. Beam Under the beam of the beam used at the bottom of the beam 3, equipped with an underwater camera and a light for illumination, while observing the monitor by a separate means, while adjusting the brilliant adjustment in the hole for the fixed pin previously provided in the lower core plate Can be easily set using bolts.

[Brief description of drawings]

FIG. 1 is a front view showing an overall configuration in which each mechanism such as a Z-axis, an X-axis, a Y-axis and a φ-axis, and a chip collecting device of a baffle former bolt replacement device according to the present invention is arranged on a carriage base. is there.

FIG. 2 is a side view of the previous FIG.

FIG. 3A is a front view showing the configuration of a Z-axis mechanism,
(B) is sectional drawing which shows the arrow aa.

FIG. 4A is an enlarged view of details of a portion b in FIG. 3A,
(B) is sectional drawing which shows the arrow cc.

5A is a side view of FIG. 3A, and FIG. 5B is a cross-sectional view showing an arrow d-d.

FIG. 6 is a front view showing the configuration of an X-axis mechanism.

FIG. 7 is a side view of the previous FIG.

FIG. 8 is a front view showing a moving part of the Y-axis mechanism.

FIG. 9 is a side view of the previous FIG.

FIG. 10 is a side view of FIG. 8 showing the internal structure of the φ-axis mechanism.

11 (a) is a plan view taken along line ff of FIG.
(B) is sectional drawing which shows the arrow gg of (a).

FIG. 12 is a side view showing a chip collecting device.

FIG. 13 is a plan view of the previous FIG.

FIG. 14 is an enlarged view of portion h of FIG.

FIG. 15 is a side view (enlarged) showing an arrow ee of FIG.

FIG. 16 is a side view showing the usage state of the baffle former bolt replacement device with the beam installed on the lower core plate.

FIG. 17 is a plan view of a beam leg portion.

FIG. 18 is a side view showing a configuration of a beam leg portion.

FIG. 19 is a front view of the previous FIG.

FIG. 20 is a perspective view showing a state formed by a baffle plate and a baffle mounting plate of a lower core chamber in a reactor vessel.

21 is a cross-sectional view showing a cross section AA of the previous FIG.

FIG. 22 is an enlarged view of a B part in FIG. 21.

[Explanation of symbols]

6 ... Z-axis mechanism, 7 ... X-axis mechanism, 8 ... Y-axis mechanism, 9 ... φ-axis mechanism, 12 ... Chip collecting device, 5 ... Carriage base plate, 41 ... X-axis plate, 56 ... Moving hardware.

Continued front page    (72) Inventor Eiji Yokoe             1-1 1-1 Wadasaki-cho, Hyogo-ku, Kobe-shi, Hyogo             No. Mitsubishi Heavy Industries, Ltd.Kobe Shipyard

Claims (20)

[Claims] 1. A Z-axis mechanism for vertically moving a carriage base plate, an X-axis mechanism for horizontally moving an X-axis plate provided on the carriage base plate, and a moving hardware provided on the X-axis plate. , A Y-axis mechanism for moving back and forth, a φ-axis mechanism provided on the moving hardware for attaching / detaching the baffle former bolt, and foreign matter such as chips generated when the baffle former bolt is attached / detached. A baffle former bolt replacement device comprising a chip collecting device for collecting. 2. A servomotor provided on the Z-axis mechanism,
A servomotor and a ball screw provided on the X-axis mechanism,
The resolver detector is used for each of a hydraulic cylinder provided in the Y-axis mechanism, a hydraulic motor and a lower shaft provided in the φ-axis mechanism, and the baffle former bolt installation according to claim 1. Replacement device. 3. The Z-axis mechanism has a beam installed on a lower core plate as a guide shaft, and is formed so that the carriage base plate moves up and down via a guide roller portion. 3. The baffle former bolt replacement device according to claim 1, wherein a rack is provided, and the rack engages with a pinion of a rack and pinion portion provided on the carriage base plate. 4. The baffle according to claim 3, wherein the hard stop portion provided at the lower portion of the guide roller portion constantly crimps the outer side of the roller receiving portion provided on the beam with crimping metal. Former bolt replacement device. 5. The baffle former bolt replacement device according to claim 3, wherein a leg of the beam to be used at the lowermost portion of the beam is provided with an underwater camera and an illumination light. 6. The X-axis plate is moved by the X-axis mechanism along a first linear way provided on the carriage base plate, according to any one of claims 1 to 5. Baffle former bolt replacement device. 7. A fixing device for fixing a hydraulic X-axis plate at a predetermined position at a central portion of the X-axis plate is provided on a metal member provided on the carriage base plate. Item 7. The baffle former bolt replacement device according to Item 6. 8. A second linear way is provided on a box-shaped metal piece arranged on the X-axis plate, and a Y-axis is provided on the second linear way.
The baffle former bolt replacement device according to any one of claims 1 to 7, wherein the moving hardware moves by the shaft mechanism. 9. In the φ-axis mechanism, a large-diameter gear and a small-diameter gear are mounted on an upper shaft that is orthogonal to a hydraulic motor shaft, and a clutch switching metal member formed so as to slide on the upper shaft approximately in the middle thereof. The large-diameter gear and the small-diameter gear that are mounted on the lower shaft and are rotatably mounted on the lower shaft are engaged with a clutch mounted on the lower shaft, and are mounted in inverse proportion to each other in size. Item 9. The baffle former bolt replacement device according to any one of items 1 to 8. 10. A rotary shaft driven by a gear mounted on the lower shaft, wherein an end where the gear is not mounted is formed so that an adapter can be replaced by a shape of a replacement bolt. The baffle former bolt replacement device according to claim 9. 11. The baffle former bolt replacement device according to claim 10, wherein the rotation shaft is formed symmetrically. 12. The chip collecting device is formed on a flat-bottomed tray having a substantially rectangular shape, and right and left rectangular ducts having a rectangular cross-sectional shape are bent along both left and right ends to be guided to the front end, and the front end is provided. The square ducts connected to each of the square ducts are formed so as to be accommodated in the square duct on the front side, movable, and extendable and contractible in the longitudinal direction.
The baffle former bolt replacement device according to any one of 1. 13. The baffle former bolt replacement device according to claim 12, wherein a connecting rod is attached to each of the corner ducts of the tip portion. 14. The baffle former bolt replacement device according to claim 12, wherein the square duct is provided with a pin at a central portion of a U-shaped metal fitting. 15. A coupler is attached to the rear of the square duct, and a hose for a vacuum device is connected to the coupler by a separate means. 13. The baffle former bolt replacement device according to claim 12, wherein the baffle former bolt replacement device is formed so as to vacuum dust and the like of brushing and flushing by a separate means. 16. The baffle former bolt replacement device according to claim 12, wherein the right-sided corner duct is formed symmetrically to the left-sided corner duct, and is formed oppositely. 17. The baffle former bolt replacement device according to claim 12, further comprising a fixing member that fixes the square duct and can be easily attached and detached. 18. A lip rubber is attached to the tip of the tray so as to minimize the leakage of dust or chips when the tray is bottomed or the tip of the tray and the internal furnace structure are in close contact with each other. The baffle former bolt replacement device according to claim 12. 19. The baffle former bolt replacement device according to claim 12, wherein a mesh is provided over the entire cutout portion above the tray to prevent dust or chips from scattering. . 20. The baffle former bolt replacement device according to claim 12, wherein the chip collecting device has a rectangular tray whose front end portion is widened so as to easily receive chips and the like.