JPH04283080A - Automatic inspecting method for interior of cargo oil tank for tanker - Google Patents

Abstract

PURPOSE:To eliminate a need for a scaffolding in a tank, to eliminate a need for a work in an elevated position, and to record the actual state of inspection by mounting and demounting an inspection mechanism, having an ITV camera, on and from a mechanism to perform measuring wormlike movement in a way to grasp a plurality of horizontal aggregates protruded from a wall surface. CONSTITUTION:An inspection mechanism 15 having an ITV camera 23 is removably mounted on first and second elevating mechanisms 14 and 14a movable in a measuring wormlike manner by grasping and releasing a plurality of side stringers 01 and longitudinal bulk-head materials 07. Further, a first steel rope 24 wound around a first winch 25 and having an intermediate part wound around a pulley 3 of the elevating mechanism 14 and an upper end coupled to the upper end of the inspecting mechanism 15 and a second steel rope 26 wound around a second winch 25a and having an intermediate part wound around a pulley 3 of the elevating mechanism 14a and an upper end coupled to the lower end of the inspecting mechanism 15 are provided. The mechanisms are used in cooperation with each other, the inspecting mechanism 15 is continuously moved, and automatic inspection is carried out through remote control.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for automatically inspecting the interior of a tanker's cargo tank.

0002

2. Description of the Related Art Conventionally, for example, as a cargo oil tank for a large tanker, as shown in the partial perspective view of FIG.
Upper deck 04 each reinforced with a plurality of deck longitudinal ribs 03,
A hull configured by being fixed to a bottom shell plate 06 reinforced with a plurality of vertical bottom ribs 05 is connected to a pair of left and right vertical bulkheads 08 and a plurality of bulkhead vertical ribs 09 reinforced with a plurality of vertical bulkhead ribs 07. It is known that partitions are partitioned vertically and horizontally at appropriate intervals by horizontal partition walls 010 reinforced with. Here, 011 is a ship side cargo oil tank. Inspections of welded parts of this type of cargo oil tank are performed by visual inspection by an inspector who moves on a scaffold erected within the cargo oil tank.

However, such means have the following drawbacks. (1) Since the scaffolding is to be erected within a huge cargo oil tank, it requires a large number of skilled workers and a long construction period, resulting in a huge cost. (2) Scaffold erection work and visual inspection work are both work at heights, so it cannot be said that safety is sufficient. (3) Since the inspection is visual, there are individual differences in the results among inspectors, and therefore reliability cannot be said to be sufficient.

0004

[Problems to be Solved by the Invention] The present invention has been proposed in view of the above circumstances, and is a method that does not require scaffolding in the tank, does not involve work at high places, and further records actual inspection results. The purpose of the present invention is to provide an automatic inspection method for the inside of a tanker's cargo tank, which is economical, safe, and reliable.

[0005]

[Means for Solving the Problems] To this end, the present invention provides a method for remotely inspecting the interior of a cargo oil tank of a tanker, in which a plurality of horizontal aggregates are protruded from opposing first and second walls at appropriate intervals, respectively. , comprising first and second elevating mechanisms movable like inchworms by gripping and releasing a plurality of horizontal aggregates of the first and second walls, respectively, and an ITV camera supported by a rotating arm; an inspection mechanism that can be attached to and detached from the first and second lifting mechanisms;
The above-mentioned inspection wherein the lower end is wound around a first winch disposed on the bottom of the ship, the middle part is wound around a pulley pivotally connected to the first lifting mechanism, and the upper end is attached to the first lifting mechanism. A first cable connected to the upper end of the mechanism, a lower end wound around a second winch disposed on the bottom of the ship, an intermediate part wrapped around a pulley pivotally connected to the second elevating mechanism, and an upper end and a second cable connected to the lower end of the inspection mechanism, and the inspection mechanism attached to the first lifting mechanism inspects the first wall while ascending along the first wall. Next, the inner surface of the top plate of the cargo oil tank is connected to the first and second cables tensioned between the first and second elevating mechanisms that grip the upper ends of the first and second wall surfaces, respectively. The inner surface of the top plate is inspected while the inspection mechanism supported by the above is moved laterally, and the second wall is inspected by the inspection mechanism relocated to the second elevating mechanism that descends along the second wall. It is characterized by inspecting.

[0006]

[Operation] An ITV is installed in the first and second elevating mechanisms that grip and move like inchworms a plurality of horizontal aggregates protruding from the first and second opposing walls of the cargo oil tank at appropriate intervals. By attaching and detaching the inspection mechanism to the inspection mechanism, the first and second wall surfaces can be automatically inspected by remote control. Also, the first and second
The winch and the first and second ropes work together to
By horizontally moving the inspection mechanism in a suspended state between the lifting and lowering mechanisms, the inner surface of the top plate of the cargo oil tank can be automatically inspected by remote control.

[0007]

[Embodiment] An embodiment in which the present invention is applied to a ship's side cargo oil tank will be explained with reference to the drawings. The same reference numerals as in FIG. 5 indicate the same members as in the same figure. In the partially enlarged view and the plan view of FIG. 3, reference numeral 1 denotes a vertical cylindrical telescoping machine in which a pulley 3 is pivotally supported at the upper end of the main body 2 and a telescopic piston 4 is inserted into the lower end. It is compressed air. 5 and 6 are the upper part of the main body 2 and the piston 4, respectively.
A piston 7 attached to the lower end of the
, 8 are inserted into the upper telescopic cylinder, the lower telescopic cylinder 9 is provided protruding from the tip of the piston 7, and a pair of upper and lower claws 1 are inserted.
0, 11 is an upper hand operated by an opening/closing cylinder 12; 13 is a pair of upper and lower claws 1 protruding from the tip of the piston 8;
The telescopic machine 1, the upper hand 9, the lower hand 13, etc. cooperate to form a first elevating mechanism 14 with the lower hand operated by the opening/closing cylinder 12. 15, a detachable device 17 formed from an electromagnet or the like is attached to one side of the main body 16,
Joint 18, arm 19, joint 20, arm 21 and joint 2 at the tip
an inspection mechanism in which an ITV camera 23 is supported via 2;
4 is a first steel cable whose lower part is wound around the first winch 25 installed on the bottom vertical frame 05, whose middle part is wound around the pulley 3, and whose upper end is connected to the upper end of the main body 16 of the inspection mechanism 15; 26
A second winch 25 whose upper end is connected to the lower end of the main body 16, whose middle part is hung around the pulley 3 of the second elevating mechanism 14a attached to the vertical bulkhead 08, and whose lower end is installed on the bottom longitudinal frame 05.
This is the second steel cable wound around a. Note that the structures of the second lifting mechanism 14a and the second winch 25a are the same as those of the first winch 25a.
The elevating mechanism 14 and the first winch 25 are the same.

[0008] In such a device, the ship side cargo oil tank 01
1, as shown in FIG. At the same time, the inspection mechanism 15 is fixed to this via the attachment/detachment device 17, and the two lower parts of the vertical bulkhead 08 are attached.
A second elevating mechanism 14a is attached to the longitudinal ribs 07, 07 of the book's longitudinal partition via the upper hand 9 and lower hand 13, respectively. At that time, the lower end of the first steel cable 24 is connected to the first winch 2.
5, the middle part is wound around the pulley 3 of the first elevating mechanism 14, and the upper end is connected to the upper end of the inspection mechanism 15. In addition, the lower end of the second steel cable 26 is wound around a second winch 25a installed on the bottom longitudinal frame 05 near the vertical bulkhead 08, and the middle part is wound around the pulley 13 of the second lifting mechanism 14a. The upper end is connected to the lower end of the inspection mechanism 15. Next, using the extender 1, the upper hand 9, the lower hand 13, etc., remove the pair of upper claws 10 and 11 from the upper hull longitudinal frame 01, extend the piston 4, and After gripping the ship's side vertical bone 01 with the claws 10 and 11,
By repeating the operation of removing the pair of claws 10 and 11 from the lower ship side vertical bone 01, retracting the piston 4, and grasping the next ship side vertical bone 01, the first elevating mechanism 14 is moved to the ship side like an inchworm. While ascending sequentially on the vertical bone 01, the IT of the inspection mechanism 15
The welded portion is inspected by remote monitoring means via the V-camera 23, and at this time, the second elevating mechanism 14a also moves up the longitudinal rib 07 of the longitudinal partition one after another. Furthermore, in the cross-sectional view of FIG. 4, when the elevating mechanism 14 reaches the upper end of the ship's side shell plate 02, as shown by the chain line B, the attaching/detaching mechanism 17 of the inspection mechanism 15 is removed, and
The joint 18 (FIG. 2) is rotated, the second steel cable 26 is wound in by the second winch 25a, the first steel cable 24 is loosened by the first winch 25, and the inspection mechanism 15 is turned to the state shown by chain line C. While suspended in the air, move horizontally and inspect the welds on the underside of upper deck 04. When the inspection mechanism 15 reaches the vicinity of the vertical bulkhead 08, the attachment/detachment mechanism 17 is moved to the second position as shown by the chain line D.
while rotating the joint 18, etc., winding the second steel cable 26 with the second winch 25a, and loosening the first steel cable 24 with the first winch 25, as shown by chain line E. In this state, the welded portion of the vertical partition wall 08 is inspected.

[0009] According to the device of the embodiment, the first and second elevating units are movable like inchworms by grasping the ship's side shell, the plurality of ship's side vertical bones of the longitudinal bulkhead, and the longitudinal bulkhead's vertical bones, respectively. a mechanism, an inspection mechanism having an ITV camera supported by a rotating arm and detachable from the first and second elevating mechanisms, and a lower end wound around a first winch disposed on the bottom vertical frame. a first steel cable whose middle part is wrapped around a pulley pivotally connected to the first elevating mechanism, whose upper end is connected to the upper end of the inspection mechanism attached to the first elevating mechanism, and whose lower end is connected to the bottom of the ship. a second steel cable that is wound around a second winch disposed on the vertical frame, the middle part of which is wound around a pulley pivotally connected to the second elevating mechanism, and the upper end of which is connected to the lower end of the inspection mechanism; First, while ascending along the ship's side skin, the wall surface of the ship's side skin is inspected by the inspection mechanism attached to the first elevating mechanism, and then the lower surface of the upper deck is inspected along the ship's side skin, vertically. While horizontally moving the inspection mechanism, which is suspended in the air by the first and second steel cables tensioned between the first and second elevating mechanisms, which grasp the upper ends of the walls of the bulkheads, the upper Since this is an automatic inspection method in which the lower surface of the deck is inspected and the wall surface of the longitudinal bulkhead is inspected by the inspection mechanism relocated to the second elevating mechanism that descends along the longitudinal bulkhead, the following effects can be achieved. (1) There is no need to erect scaffolding, thus reducing inspection costs and improving economic efficiency. (2) Scaffold erection work and on-site visual inspection work are no longer required, thus eliminating work at heights and improving safety. (3) The actual status of the inspection can be recorded, so multiple people can review it at any time, improving the reliability of the inspection.

0010

Effects of the Invention In short, according to the present invention, the opposing first
, when inspecting by remote control the inside of a cargo oil tank of a tanker, in which a plurality of horizontal aggregates are protruded from the second wall at appropriate intervals, each of the plurality of horizontal aggregates on the first and second walls is grasped. a first and second elevating mechanism that can be opened and moved like an inchworm; an inspection mechanism that has an ITV camera supported by a rotating arm and is removable from the first and second elevating mechanisms; The above-mentioned inspection mechanism is wound around a first winch disposed on the bottom of the ship, the middle part is wound around a pulley pivotally connected to the first elevating mechanism, and the upper end is attached to the first elevating mechanism. The first rope is connected to the upper end, the lower end is wound around a second winch disposed on the bottom of the ship, the middle part is wound around a pulley pivotally connected to the second elevating mechanism, and the upper end is wound around the second winch disposed on the bottom of the ship. and a second cable connected to the lower end of the inspection mechanism, first inspecting the first wall surface with the inspection mechanism attached to the first lifting mechanism while ascending along the first wall surface; Next, the inner surface of the top plate of the cargo oil tank is supported by the first and second cables tensioned between the first and second elevating mechanisms that grasp the upper ends of the first and second walls, respectively. The inner surface of the top plate is inspected while the inspecting mechanism is moved laterally, and the second wall is further inspected by the inspecting mechanism relocated to the second elevating mechanism that descends along the second wall. This method does not require scaffolding inside the tank, does not involve work at high places, and can record the inspection status, and is therefore highly economical, safe, and reliable. Therefore, the present invention is extremely useful industrially.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention.

FIG. 2 is a partially enlarged view showing the first elevating mechanism in FIG. 1;

FIG. 3 is a plan view taken along III-III in FIG. 2;

FIG. 4 is a cross-sectional view showing how to use the method of the present invention.

FIG. 5 is a partial perspective view showing a cargo oil tank of a known large tanker.

[0011]

[Explanation of symbols]

1　Expansion machine 2 Main body 3 Pulley 4 Piston 5 Upper telescopic cylinder 6 Lower telescopic cylinder 7 Piston 8 Piston 9 Upper hand 10 Nails 11 Nails 12 Opening/closing cylinder 13 Lower hand 14 First lifting mechanism 14a Second lifting mechanism 15 Inspection mechanism 16 Main body 17 Attachment/detachment machine 18 Joints 19 Arm 20 Joints 21 Arm 22 Joints 23 ITV camera 24 First steel cable 25 First winch 25a Second winch 26 Second steel cable 01 Ship side vertical bone 02 Ship side outer plate 03 Upper deck vertical bone 04 Upper deck 05 Bottom vertical bone 06　Bottom shell plate 07 Longitudinal bones of the medial septum 08 Vertical bulkhead 011 Ship side cargo oil tank

Claims (1)

[Claims] Claim 1: When inspecting, by remote control, the inside of a cargo oil tank of a tanker, in which a plurality of horizontal aggregates are protruded from the first and second walls facing each other at appropriate intervals, the first and second walls are inspected by remote control. The first and second elevating mechanisms have first and second elevating mechanisms that can be moved like inchworms by grasping and releasing a plurality of horizontal aggregates, respectively, and an ITV camera supported by a rotating arm. a detachable inspection mechanism; a lower end is wound around a first winch disposed on the bottom of the ship; a middle part is wound around a pulley pivotally connected to the first elevating mechanism; an upper end is wound around the first elevating mechanism; A first cable connected to the upper end of the inspection mechanism attached to the mechanism, a lower end wound around a second winch disposed on the bottom of the ship, and an intermediate part pivotally connected to the second lifting mechanism. a second rope that is hung around a pulley and whose upper end is connected to the lower end of the inspection mechanism; first, while ascending along the first wall surface, the inspection mechanism attached to the first lifting mechanism The first wall surface is inspected, and then the inner surface of the top plate of the cargo oil tank is inspected.
The inner surface of the top plate is inspected while moving the inspection mechanism, which is supported by the first and second ropes tensioned between the first and second elevating mechanisms, which grasp the upper end of the wall, respectively. An automatic inspection method for a cargo oil tank of a tanker, further comprising inspecting the second wall surface by the inspection mechanism relocated to the second elevating mechanism that descends along the second wall surface.