JPH0812153B2 - Inner wall surface inspection device for closed tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a long cylindrical brackish water separator installed in a thermal power plant, a nuclear power plant, a chemical plant, or the like.
The present invention relates to an inner wall surface inspection device for a closed tank such as a drain tank of a water elimination separator.

(Prior Art) Conventionally, many brackish water separators are used in thermal power plants, nuclear power plants, chemical plants, etc. (inner diameter is about 60 cm, length is about 3.5-6 m) )
Also, the inspection and inspection work for a closed tank such as a drain tank of a brackish water separator (with an inner diameter of about 60 to 75 cm and a length of about 17 to 24 m) is performed outside the long cylindrical closed tank. It is customary to inspect and inspect the welded portion in the longitudinal direction and the circumferential direction of the surface by an external observation means.

(Problems to be solved by the invention) However, due to the nature of this type of sealed tank, repeated high temperature and high pressure loads are applied, and in order to improve the inspection accuracy for long-term use, the above-mentioned problem is to be solved. It is inherently inadequate to inspect only the outer surface of the tank, and there is a demand for an inspection means that can relatively easily perform the observation of the welded portion on the inner side of the long cylindrical sealed tank from the outside. It was

Therefore, in the invention described in the specification of Japanese Patent Application No. 2-142798 and the drawings (hereinafter referred to as the prior invention), a camera case for accommodating a television camera is hung up and down freely at the tip of the main body case. A plurality of wire rods are projected from the center of gravity of the camera case in the radial direction, the balance weight is fixed to the tip of the wire rod, and the base end of the body case is
The present invention provides an internal inspection device for a sealed tank, which rotatably supports a winding drum of a flexible wire that moves up and down a camera case at the tip.

As a result, the branch pipe portion of the upper portion of the branch pipe portion having a limited diameter formed in the upper portion and the lower portion of the closed tank in the brackish water separator, the drain tank of the brackish water separator, etc. Introducing the internal inspection device according to the above, the camera case suspended at the tip of the main body case in the inspection device can be freely moved up and down or swung in the tank to weld the inner wall surface of the tank in vertical and horizontal directions. Along the line
By moving the TV camera housed in the camera case and observing the condition of the inner wall surface of the tank while monitoring it from the outside from the TV while recording it on a video tape recorder, the internal inspection of the closed tank can be performed smoothly and quickly. I made sure that I could do it.

However, in the case of the prior invention, the internal inspection device is introduced from the branch pipe portion above the closed tank in the brackish water separator, the drain tank of the brackish water separator, etc., and the camera is installed from the tip of the main body case of the inspection device. Since it is a system in which it is suspended by the scale structure of the case and is made to function, it is not possible to deal with the inspection along the weld lines in the vertical and horizontal directions of the inner wall surface of the tank located above the camera case.

(Means for Solving Problems) Therefore, in the present invention, a multi-stage cylinder Y is pivotally provided at the tip of the main body case 1, and a camera case 36 for housing a television camera is supported at the tip of the multi-stage cylinder Y. Then, at the lower end portion of the multi-stage cylinder Y, a drive device for starting the multi-stage cylinder Y by the rotation of the rotary shaft 25 is provided.
Further, at the base end of the multi-stage cylinder Y, the rotation of the flexible shaft 18 causes the multi-stage cylinder Y and the camera case to rotate.
Provided is an inner wall surface inspection device for a hermetically sealed tank, which is provided with a drive device for rotating 36, and a wire cable 33 for controlling the expansion and contraction operation of the multistage cylinder Y is connected to the tip of the multistage cylinder Y. By properly using the invention and the internal inspection device according to the above-mentioned prior invention, the completeness of the inspection of the inner wall surface of the sealed tank of this kind was dealt with.

(Operation) Then, the inner wall surface inspection device of the present invention is introduced from the branch pipe portion U below the sealed tank T in the brackish water separator, the drain tank of the brackish water separator, and the main body case of the inspection device is introduced. The multi-stage cylinder Y pivotally installed at 1 is raised to the center of the closed-type tank T, and a camera case 36 with a built-in TV camera is provided at the tip of the multi-stage cylinder Y in an orthogonal shape toward the inner wall surface of the tank. The multi-stage cylinder Y, which is vertically supported in the center of the tank, is expanded and contracted so that the TV camera can be moved up and down along the welding line on the inner wall surface of the tank, and the TV can be moved at an appropriate height position. By turning the camera around, the inspection of the inner wall surface of the tank was dealt with.

An embodiment of an inner wall surface inspection device for a sealed tank according to the present invention will be described below with reference to the accompanying drawings.

(Embodiment) 1 is a cylindrical body case having a diameter of about 10 cm and a length of about 120 cm, and the upper half portion of the front side thereof having a length of about a quarter is made substantially horizontal. It is formed in the cut-out cutout portion 2, and the lower half portion thereof is formed in the semi-arcuate receiving cylinder portion 3.

Reference numeral 4 denotes a flange fixed to the base end of the main body case 1.

Y is a pneumatic cylinder (hereinafter simply referred to as a multi-stage cylinder) that expands and contracts in multiple stages by air pressure. As shown in FIG. 4, the first inner cylinder of the outermost cylinder 5 has a small cylinder diameter. The inner cylinder 6, the second inner cylinder 7, the third inner cylinder 8 and the fourth innermost cylinder 9 are closely fitted and supported in this order.

Reference numeral 10 denotes a bottom lid screwed and fixed to a base end portion of the outermost cylinder 5, and an air communication passage 12 to the inside of the multistage cylinder Y is bored in a central portion of a central protrusion 11 thereof.

13 is an external gear fitted and fixed to the central protrusion 11, 14 is an external gear
13 is a pinion gear meshing with 13, 15 is a rotation shaft of the pinion gear 14, the inner end of which is borne by the bearing case 16, and the outer part of which is located near the outer periphery of the flange plate 17 fitted to the bottom cover 10. The bearing is supported by.

Reference numeral 18 denotes a flexible shaft inserted through the inside of the main body case 1, and a tip end fitting 19 thereof is fitted and fixed to the rotary shaft 15 of the pinion gear 14.

Reference numeral 20 is a bearing plate for the multi-stage cylinder Y, and as shown in FIG.

Reference numeral 21 is a bearing fixed to the left and right inner wall surfaces near the base end of the receiving cylinder portion 3, 22 is a rotary shaft of the multistage cylinder Y, and is inserted through the left and right bearings 21 of the receiving cylinder portion 3 and the left and right bearing plates 20. I support you.

23 is a worm gear fitted and fixed to the center of the rotary shaft 22,
Reference numeral 24 is a worm that meshes with the worm gear 23, and 25 is a rotary shaft having the worm 24 fitted and fixed to the tip thereof.
As shown in FIG. 3 and FIG. 3, a bearing fixed to the bottom of the receiving cylinder portion 3 directly below the worm gear 23 with a front-rear interval.
26, the tip end portion of the rotary shaft 25 is inserted and supported.

Reference numeral 27 denotes a nipple screwed into the air communication passage 12 of the bottom lid 10 of the multi-stage cylinder Y. As shown in FIG. 2, the tip of an air hose 28 inserted through the inside of the main body case 1 is connected to the multi-stage cylinder. Functions as an air supply / exhaust port to the cylinder Y.

In FIG. 5, reference numeral 29 is a lid portion that closes the tip ceiling portion of the innermost cylinder 9 in the multi-stage cylinder Y, and 30 is a disk-shaped top plate that is capped and fixed to the lid portion 29, and has a central shaft portion 31. An intermediate table 32 is loosely rotatably fitted and supported on the intermediate table 32.

Reference numeral 33 denotes a wire cable whose tip is connected to the outer peripheral positions of the left and right sides of the intermediate table 32. As shown in FIG. 2, the wire cable is inserted through the main body case 1 to receive the left and right outer peripheral parts of the multistage cylinder Y. The left and right wire cables 33, which are pulled out through the space between the inner peripheral portion of the cylindrical portion 3 and the left and right wire cables 33, are stretched and supported so as not to rotate relative to a top plate 30 that is rotatable integrally with the multistage cylinder Y. are doing.

Reference numeral 34 is a fixed plate fitted and fixed to the central shaft portion 31 of the top plate 30, and bearing plates 35 are vertically projected on both front and rear sides thereof.

Reference numeral 36 denotes a cylindrical camera case, the front and rear positions of which are close to the base end are pivotally mounted on a bearing plate 35 by a support shaft 37, and a cylindrical television camera ( (Not shown) is stored and supported, and a lamp (not shown) that illuminates toward the photographing side of the television camera is attached as necessary.

A coil spring 38 biases and supports the camera case 36, and one end of the coil spring is supported by the camera case 36 and the other is supported by the bearing plate 35.

Reference numeral 39 is a stopper for holding the camera case 36 substantially orthogonally to the multi-stage cylinder Y, the base end of which is a fixed platen.
It is fixed vertically at 34.

Reference numeral 40 denotes a guide roller for the wire cable 33, which is rotatably supported by both left and right side portions of the receiving tube portion 3 near the base end portion.

Reference numeral F denotes an operation unit frame fixedly supported on the base end of the main body case 1. A front plate 41 and a rear plate 42, which are disk-shaped and arranged at a front and rear thereof with a space therebetween, are arranged, and a vertical position between them. And connect the connecting plates 43, 44 in the front-rear direction of the left and right position and fix it,
Further, the upper and lower connecting plates 43 are fixed to each other by vertical support plates 45 which are spaced from each other on the left and right sides.

Reference numeral 46 is a wire reel disposed on the left and right of the support plate 4, 47 is a rotation shaft of the wire reel 46, and the side connecting plate 44 is inserted into the support plate 45 to support the bearing.

48 is a worm gear fitted and fixed to the rotating shaft 47,
A worm 49 that meshes with the worm gear 48 is supported immediately above the bearing.

Reference numeral 50 denotes a rotating shaft of the worm 49, and an operation handle 51 is detachably fitted to a front end portion of the worm 49, and the forward / reverse rotation operation of the operation handle 51 controls the expansion / contraction operation of the multistage cylinder Y.

52 is a handle for turning the TV camera (a handle may be used), 53 is a rotating shaft of the turning handle 52, 54 is a connecting rod having a universal joint 55 formed at both front and rear ends thereof, and a universal joint 55 on the front side thereof. The rear end of the rotating shaft 53 is freely connected, the universal joint 55 on the rear side is freely connected to the base end of the flexible shaft 18, and the multistage cylinder Y is connected by the forward and reverse rotation operation of the turning handle 52. The turning of the camera case 36 set on the top of the head is controlled.

56 is an operating handle of the multi-stage cylinder Y (can be a handle), 57 is a rotating shaft of the operating handle 56, 58 is a connecting rod having universal joints 59 formed at both front and rear ends thereof, and a universal joint 59 on the front side thereof. Connect freely with the rear end of the rotating shaft 57,
The universal joint 59 on the rear side and the base end of the rotary shaft 25 are freely connected, and the forward / reverse rotation operation of the operating handle 56 allows the multistage cylinder Y to be started or stored with the rotary shaft 15 as a fulcrum. Control the tilting operation.

Reference numeral 60 denotes a scale that is linearly engraved on the cylinder surface of the main body case 1 or is drawn and formed, and functions as a guide for the insertion distance of the main body case 1.

In FIG. 1, reference numeral 61 denotes an air supply / exhaust port at the tip of the air hose 28, the tip of which is connected to the nipple 27 at the lower end of the multi-stage cylinder Y so that the inner wall surface of the main body case 1 is at the front side. It is inserted through the base end portion of the rear panel 42, protrudes from the lower portion of the front panel 41 through the central through hole of the rear panel 42, and a connecting hose with a compressor or a blower (not shown) is connected to the air supply / exhaust port 61.

Thus, after the television camera (not shown) is housed and supported in the camera case 36 of the inspection apparatus according to the present invention, the multistage cylinder Y is removed from the cutout portion 2 of the main body case 1 as shown in FIG. It is set in advance in a state of being housed in the receiving tube portion 3.

On top of that, the camera case 36 resists the biasing force of the coil spring 38 and maintains a state where it stands up in a substantially straight line with the multi-stage cylinder Y, and a closed tank such as a brackish water separator shown in FIG. A branch pipe portion U having a relatively limited diameter in the lower portion of T
When the main body case 1 is gradually inserted, the camera case 36 at the tip of the multi-stage cylinder Y is exposed to the inside of the sealed tank T, and then the coil spring is inserted.
The urging force of 38 causes the multistage cylinder Y to stand upright at right angles as shown in the tip of FIG.

In that state, when the main body case 1 is further pushed and about 70 to 80% of the inner diameter of the sealed tank T is inserted, the operation handle 56 for starting up the multistage cylinder Y is gradually rotated, thereby rotating the rotary shaft. While gradually raising the multi-stage cylinder Y with 22 as the fulcrum, further inserting the main body case 1 and checking the insertion distance on the scale 60, the multi-stage cylinder Y is set at the approximate tank center position of the sealed tank T. When raised, the main body case 1 is fixed to the branch pipe portion U.

Then, an external compressor or the like is driven to supply compressed air having an appropriate air pressure from the air supply / exhaust port 61 to the inside of the multi-stage cylinder Y via the air hose 28, while operating the operation handle 51 of the wire cable 33. By gradually rewinding the innermost cylinder 9 in the multi-stage cylinder Y, the innermost cylinder 9 is extended first, and the extension force is adjusted appropriately according to the amount of rewinding of the wire cable 33. The outer cylinder 5 is stretched and extended.

This enables the camera case 36 with a built-in TV camera.
However, the tank center is moved vertically upward.

As a matter of course, in this type of sealed tank T, the upper and lower welding lines X are formed in the longitudinal direction of the inner wall surface, and the circumferential welding line Z is formed in the inner wall surface. X, Z
It is required to inspect for cracks in the vicinity of the.

Among them, with respect to the welding line Z in the circumferential direction, when the camera case 36 having the built-in television camera is moved up to the position of the welding line Y, the swiveling handle 52 is rotated, whereby the flexible shaft is rotated. Pinion gears through 18
By driving 14 and the external gear 13 meshing with it being driven, the entire multistage shaft Y can be rotated in the normal and reverse directions within a range of about one rotation.

As a result, an appropriate turning force is applied to the camera case 36, and the presence or absence of cracks in the vicinity of the welding line Z in the circumferential direction is inspected.

Also, for the vertical welding line X, the welding line X
After rotating the camera case 36 toward the direction, the operation handle 51 of the wire reel 46 is rotated and the multi-stage cylinder Y is rotated.
The wire cable 33 is rewound while air is supplied to the multi-stage cylinder Y, or the wire cable 33 is wound up while air is being evacuated from the multi-stage cylinder Y by using the supply / exhaust control to the welding cylinders in the vertical and vertical directions. The presence or absence of cracks in the vicinity of X is inspected.

This is monitored by an external television (TV) and further recorded in a video tape recorder (VTR), thereby achieving the purpose of the inner wall surface inspection for the sealed tank T of this kind.

(Effects of the Invention) In the present invention, as described above, the multistage cylinder Y is pivotally provided at the tip of the main body case 1, and the tip of the multistage cylinder Y is
A driving device that supports a camera case 36 that accommodates a television camera and that drives the multistage cylinder Y by the rotation of the rotary shaft 25 is provided at the lower end of the multistage cylinder Y.
Further, at the base end of the multi-stage cylinder Y, the rotation of the flexible shaft 18 causes the multi-stage cylinder Y and the camera case to rotate.
An inner wall surface inspection device for a hermetically sealed tank, which is provided with a drive device for rotating 36, and a wire cable 33 for controlling the expansion and contraction operation of the multistage cylinder Y is connected to the tip of the multistage cylinder Y. Provided is an inner wall surface inspection device for a sealed tank having the configuration.

(A) The multi-stage cylinder Y is provided in the inner peripheral portion of the outermost cylinder 5 and the first inner cylinder 6 having a small cylinder diameter.
, The second inner cylinder 7, and the third inner cylinder 8
Then, the innermost cylinder 9 is densely fitted and supported in this order.

(B) The bottom cover 10 is fixed to the base end of the outermost cylinder 5 of the multi-stage cylinder Y, and the external gear 13 is attached to the central protrusion 11 of the bottom cover 10.
A pinion gear 14 that engages with and is fixed to the external gear 13.
The pinion gear 14 has a rotary shaft 15 on which a tip fitting 19 of a flexible shaft 18 inserted through an inner wall surface of the body case 1 is fitted and fixed.

(C) The rotary shaft 22 of the multi-stage cylinder Y is bearing-supported at a position near the base end of the receiving cylinder part 3 of the main body case 1, and the worm gear 23 is fitted and fixed to the rotary shaft 22, and the part immediately below the rotary shaft 22 is fixed. A worm 24 that meshes with the worm gear 23 is provided at the bottom of the receiving cylinder 3, and the tip of the rotary shaft 25 is fitted and fixed to the worm 24.

(D) A top plate 30 is fixed to the ceiling of the innermost cylinder 9 of the multi-stage cylinder Y, and a freely rotatable intermediate table 32 is fitted into the central shaft portion 31 of the top plate 30. The distal end of the wire cable 33 is connected to the outer peripheral portions at both ends of the main body case 1, and the base end portion of the wire cable 33 is inserted through the inside of the main body case 1. It is configured so that it can be wound around and rewound on the wire reel 46 provided in the.

(E) A fixed plate 34 is captively fixed to the intermediate shaft portion 31 of the top plate 30 with an intermediate table 32 interposed therebetween, and a camera case 36 is pivotally installed on a bearing plate 35 of the fixed plate 34 with a support shaft 37. Camera case 36
The coil spring 38 urges and supports the multistage cylinder Y so that it can be moved up and down.

As a result, it is possible to smoothly and promptly perform inner wall surface inspections in closed tanks such as brackish water separators and drain tanks of brackish water separators that are used in many facilities at thermal power plants, nuclear power plants, chemical plants, etc. Moreover, it can be surely performed, and when used in combination with the internal inspection device of the invention of its own invention, various effects such as a dramatic improvement in the work efficiency at the time of this type of regular inspection work are brought about.

[Brief description of drawings]

FIG. 1 is a perspective view showing an inner wall surface inspection apparatus of the present invention in which a multi-stage cylinder is raised, FIG. 2 is a front view showing a state in which the multi-stage cylinder is housed in a main body case, and FIG. 3 is a receiving tube portion of the main body case. FIG. 4 is a cross-sectional view showing the lower structure of the multi-stage cylinder that has been set up in FIG. 4, FIG. 4 is a cutaway front view showing the lower structure of the multi-stage cylinder, and FIG. 5 is a front view showing the upper structure of the multi-stage cylinder.
FIG. 6 is a cutaway side view showing the operation portion frame, and FIG. 7 is a schematic view showing a use state. Code table T: Sealed tank, Y: Multi-stage cylinder F: Operation part frame 1 ... Main body case 2 ... Notch part 3 ... Receiving cylinder part, 4 ... Flange 5 ... Outermost cylinder, 6 to 8 …… Inner cylinder 9 …… Inner cylinder 10 …… Bottom lid, 11 …… Central protrusion 12 …… Air communication passage, 13 …… External gear 14 …… Pinion gear, 15 …… Rotary shaft 16… … Bearing case, 17 …… Flange cover 18 …… Flexible shaft, 19 …… Mounting bracket 20 …… Bearing plate, 21 …… Bearing 22 …… Rotating shaft, 23 …… Worm gear 24 …… Worm, 25 …… Rotating Shaft 26 ... Bearing, 27 ... Nipple 28 ... Air hose, 29 ... Lid 30 ... Top plate, 31 ... Central shaft 32 ... Intermediate table, 33 ... Wire cable 34 ... Fixed plate, 35 …… Bearing plate 36 …… Camera case, 37 …… Spindle 38 …… Coil spring, 39 …… Stroke Pa 40 ...... Guide roller, 41 ...... Front panel 42 ...... Rear panel, 43 ...... Connecting plate 44 ...... Connecting plate, 45 …… Support plate 46 …… Wire reel, 47 …… Rotating shaft 48 …… Worm Gears, 49 ... Worms 50 ... Rotary shafts, 51 ... Operation handles 52 ... Rotating handles, 53 ... Rotating shafts 54 ... Connecting rods, 55 ... Universal joints 56 ... Operating handles, 57 ... Rotating Axis 58 …… Connecting rod, 59 …… Universal joint 60 …… Scale, 61 …… Supply / exhaust port

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takaaki Kambara 1-12-14 Kanayama, Naka-ku, Nagoya-shi, Aichi Chubu Plant Service Co., Ltd. (56) References JP 61-256316 (JP, A) Actual Open 62-155359 (JP, U) Open 57-122566 (JP, U)

Claims (1)

[Claims] 1. A multi-stage cylinder Y is pivotally provided at the tip of a main body case (1), a camera case (36) for housing a television camera is supported at the tip of the multi-stage cylinder Y, and the lower end of the multi-stage cylinder Y is supported. The section is provided with a drive device for starting the multi-stage cylinder Y by the rotation of the rotary shaft (25),
Further, a drive device for rotating the multi-stage cylinder Y and the camera case (36) by the rotation of the flexible shaft (18) is provided at the base end of the multi-stage cylinder Y, and the multi-stage cylinder Y is provided at the tip end of the multi-stage cylinder Y. An inner wall surface inspection device for a hermetically sealed tank, comprising a wire cable (33) for controlling the expansion and contraction operation of Y, comprising the following components. (A) The multi-stage cylinder Y is provided on the inner inner peripheral portion of the outermost cylinder (5) with a first inner cylinder (6) having a small cylinder diameter, a second inner cylinder (7), and a third inner cylinder (7). The inner cylinder (8) and the innermost cylinder (9) are closely fitted and supported in this order. (B) The bottom cover (10) is fixed to the base end of the outermost cylinder (5) of the multi-stage cylinder Y, and the external gear (13) is fixedly fitted to the central protrusion (11) of the bottom cover (10). And the relevant external gear (13)
A pinion gear (14) that meshes with the pinion gear (14) is provided, and the rotary shaft (15) of the pinion gear (14) is fitted with the end fitting (19) of the flexible shaft (18) inserted through the inner wall surface of the body case (1). Fix it. (C) The rotary shaft (22) of the multistage cylinder Y is supported by a bearing at a position near the base end of the receiving cylinder part (3) of the main body case (1), and the worm gear (23) is attached to the rotary shaft (22). The worm (24) that meshes with the worm gear (23) is provided at the bottom of the receiving cylinder (3) immediately below, and the tip of the rotary shaft (25) is attached to the worm (24). Fit and fix. (D) A top plate (30) is fixed to the ceiling of the innermost cylinder (9) of the multi-stage cylinder Y, and a freely rotatable intermediate table is attached to the central shaft portion (31) of the top plate (30). (32) is fitted, the tip end of the wire cable (33) is connected to the outer peripheral portions of both ends of the intermediate table (32), and the base end of the wire cable (33) is connected to the main body case (1). The main body case (1) is inserted through the inside, and wound around the wire reel (46) provided on the operation portion frame F at the base end portion of the main body case (1) and can be unwound. (E) The fixed platen (34) is fixed to the intermediate shaft part (31) of the top plate (30) with the intermediate table (32) interposed therebetween, and the camera is mounted on the bearing plate (35) of the fixed platen (34). The case (36) is pivotally mounted on the support shaft (37), and the camera case (36) is biased and supported by the coil spring (38) so as to be movable up and down with respect to the multistage cylinder Y.