JP2012042379A - Nuclear reactor inspection robot - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nuclear reactor inspection robot which does not contaminate water stored in a nuclear reactor.SOLUTION: A nuclear reactor inspection robot 1, which moves a workbench 6 within a cylindrical shroud 50 constituting a nuclear reactor, comprises; a rotating column 4 to be inserted into the shroud 50; water-pressure rotation driving means 7 for rotating the rotation column 4 around a vertical axis by water pressure; water-pressure expansion driving means 20 for expanding the workbench 6 from the rotation column 4 by the water pressure; and water-pressure lifting driving means 40 for moving up and down the workbench 6 by the water pressure. The workbench 6 is moved along an inner wall 53 of the shroud 50.

Description

  The present invention relates to a nuclear reactor inspection robot used during maintenance inspection of a nuclear reactor.

  When performing maintenance inspections of radioactive reactors, a robot for inspecting nuclear reactors is used that moves a work tool inserted into the reactor by remote control.

  As this type of nuclear reactor inspection robot, the one disclosed in Patent Document 1 uses a ball screw driven by a motor as a drive mechanism for moving a work tool.

  In addition, there is a conventional drive mechanism of a nuclear reactor inspection robot using a hydraulic device such as a hydraulic cylinder or a hydraulic motor.

JP-A-11-52090

  However, since such a conventional robot for inspecting a nuclear reactor operates in water stored in the nuclear reactor, it lubricates hydraulic oil leaking from hydraulic equipment, oil bleeding generated in a seal portion of the hydraulic equipment, and a ball screw. Wear powder generated from oil or ball screws could contaminate the water stored in the reactor.

  In the case of such oil leakage, it is difficult to clean the nuclear reactor in a radioactive environment or perform repair work, and there is a problem that the environmental load is large.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a nuclear reactor inspection robot that does not contaminate water accumulated in a nuclear reactor.

  The present invention relates to a nuclear reactor inspection robot that moves a work table inside a cylindrical shroud that constitutes a nuclear reactor, and a swivel column inserted into the shroud, and the swivel column around a vertical axis by water pressure. A hydraulic swivel drive means for rotating the work table from the swivel strut by water pressure, and a hydraulic lift drive means for raising and lowering the work table by water pressure, the work table along the inner wall of the shroud. It was set as the structure moved.

  According to the present invention, during maintenance inspection of the inner wall of the shroud constituting the reactor, the reactor inspection robot is placed inside the shroud through the upper lattice plate in a state where the swivel support column and the workbench are stored so as to approach each other. Plugged in. Then, the hydraulic expansion driving means expands the work table from the swivel support and approaches the inner wall of the shroud, the hydraulic swivel drive means rotates the swivel support around the vertical axis, and the hydraulic lift drive means raises and lowers the work table. Thus, the work table is disposed at a predetermined position facing the inner wall of the shroud. Thereby, the maintenance inspection work of the inner wall of a shroud can be performed underwater with the attachment attached to the work table.

  The hydraulic swivel drive means, the hydraulic pressure expansion drive means, and the hydraulic pressure elevating drive means are all unified into a mechanism that operates with pressurized hydraulic water supplied and discharged by the hydraulic unit, so it has excellent controllability and improved maintenance and maintainability. Can be removed. And since the working water is used as the working fluid, even if this working water leaks into the shroud, the water stored in the shroud is not contaminated, the environmental load is extremely low, and the cleanness is high and safe. Can provide a system.

1 is a perspective view showing a schematic configuration of a shroud and a reactor inspection robot constituting a nuclear reactor in an embodiment of the present invention. The perspective view which shows the schematic structure of the shroud which comprises the nuclear reactor which shows other embodiment, and the robot for nuclear reactor inspection. The perspective view which shows the schematic structure of the robot for a nuclear reactor inspection similarly.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

(First embodiment)
FIG. 1 is a perspective view showing a schematic configuration of a reactor shroud 50 and a reactor inspection robot 1 disposed in the shroud 50.

  The shroud 50 constituting the nuclear reactor is formed in a cylindrical shape having a radius of, for example, 4 to 5 m, a height of 7 to 8 m, and a wall thickness of about 3 to 5 cm, inside the pressure vessel 30 (see FIG. 2). Installed.

  Normally, a plurality of cores (not shown) are accommodated between the upper lattice plate 51 and the lower lattice plate 52 inside the shroud 50. At the time of operation of the nuclear reactor, fission reaction is performed in each core, the water stored in the shroud 50 is heated by the thermal energy, and the generated steam is taken out from the shroud 50, and a steam turbine (not shown). To be supplied.

  FIG. 1 shows a state of the shroud 50 during maintenance inspection. During maintenance inspection of the shroud 50, a lid (not shown) provided on the upper portion of the shroud 50 is removed, various devices (not shown) and a core (not shown) housed in the shroud 50 are removed, and the shroud is removed. Water is stored in 50.

  The reactor inspection robot 1 performs maintenance inspection of the inner wall 53 of the shroud 50 from the inside of the shroud 50.

  Hereinafter, the configuration of the nuclear reactor inspection robot 1 will be described.

  In a state where the nuclear reactor inspection robot 1 is folded, it is suspended by a crane (not shown) and passes through a lattice hole having a width of about 300 mm provided in the upper lattice plate 51, and between the upper lattice plate 51 and the lower lattice plate 52. Installed.

  The reactor inspection robot 1 includes a swivel support column 4 inserted from an upper lattice plate 51 and a work table 6 that is unfolded from the swivel support column 4 and moves along an inner wall 53 of a shroud 50. Various attachments (not shown) for performing maintenance inspection of the inner wall 53 of the shroud 50 are attached.

  The nuclear inspection robot 1 includes an upper base 2 that is seated on the upper lattice plate 51 and an upper swivel 3 that rotates about the vertical axis with respect to the upper base 2.

  The upper base base 2 is formed in a disk shape that is seated on the upper lattice plate 51. A semicircular opening 2a is formed in the upper base 2 and a plurality of hydraulic pipes 11 and 12 described later are inserted into the opening 2a. However, the present invention is not limited to this, and a hydraulic swivel or rotary joint may be used in the middle of the hydraulic pipes 11 and 12 so that the hydraulic pipes 11 and 12 are not twisted even if the swivel support 4 is rotated.

  The upper swivel base 3 is installed below the upper lattice plate 51 via the swivel shaft 15, and extends from the upper swivel base 3 so that the swivel support column 4 hangs down.

  A hydraulic motor 8 and a speed reducer 9 are provided as hydraulic pressure driving means 7 for rotating the rotary column 4 around the vertical axis by water pressure.

  The hydraulic motor 8 is rotated in both forward and reverse directions by hydraulic water supplied and discharged through a hydraulic pipe 10 extending from a hydraulic unit (not shown). The rotation of the hydraulic motor 8 is decelerated by the speed reducer 9 and transmitted to the turning shaft 15, and the upper turning table 3 and the turning column 4 are rotationally driven as indicated by arrows in the figure.

  In addition, it is good also as a structure which abolishes the reduction gear 9 and drives the rotation shaft 15 directly by the hydraulic motor 8 without being limited to this.

  The upper end of the swivel support column 4 is coupled to the upper swivel base 3, and the lower end thereof is coupled to the lower swivel base 16.

  A lower base base 17 seated on the lower grid plate 52 is provided. A lower swivel base 16 is supported on the lower base base 17 so as to be rotatable about a vertical axis.

  In this way, the swivel support column 4 is supported by the upper lattice plate 51 and the lower lattice plate 52 so as to be pivotable, thereby ensuring sufficient support rigidity.

  The upper swivel base 3, the lower swivel base 16, and the lower base base 17 are each formed in a disk shape that is coaxially arranged. The outer diameters of the upper swivel base 3, the lower swivel base 16, and the lower base base 17 are formed to be smaller than the opening width of the lattice holes of the upper lattice plate 51, and are inserted through the lattice holes of the upper lattice plate 51.

  A link mechanism 5 that intersects the X-shape and a hydraulic cylinder 25 that expands and contracts the link mechanism 5 by water pressure are provided along the swing column 4 as the hydraulic pressure expansion drive means 20 that expands the work table 6 from the swivel column 4 by water pressure. It is done. With the link mechanism 5 deployed as shown in the figure, the work table 6 is brought close to the inner wall 53 of the shroud 50.

  The hydraulic cylinder 25 includes a cylinder tube 26 fixed to the swivel column 4, a cylinder rod 27 protruding from the lower end of the cylinder tube 26, a piston (not shown) coupled to the cylinder rod 27, and the piston. Two hydraulic chambers (not shown) are defined, and are expanded and contracted by a water pressure difference guided to each hydraulic chamber via a pair of hydraulic pipes 11.

  The link mechanism 5 includes links 21 and 22 that intersect in an X shape. The links 21 and 22 are connected to each other through a pin 23 so as to be rotatable. It arrange | positions so that the one link 21 may be pinched | interposed between the two links 22. FIG.

  The upper end portion of the link 21 is connected to the turning column 4 via the pin 28, and the lower end portion of the link 22 is connected to the tip end portion of the cylinder rod 27 via the pin 29. When the hydraulic cylinder 25 is expanded and contracted, the links 21 and 22 intersecting with the X shape are rotated and expanded / contracted via the pins 23.

  The link mechanism 5 includes a deployment guide column 31 extending in the vertical direction, upper and lower blocks 34 and 35 coupled to upper and lower ends of the deployment guide column 31, and a slider 32 slidably supported by the deployment guide column 31. Prepare.

  An upper end of the link 22 is rotatably connected to the upper block 34 via a pin 33. The lower end of the link 21 is rotatably connected to the slider 32 via a pin 36.

  As the links 21 and 22 rotate and expand / contract via the pin 23, the slider 32 moves up and down along the deployment guide column 31, and the deployment guide column 31 maintains the posture of extending in the vertical direction while the arrow in FIG. Move horizontally as shown by.

  A hydraulic cylinder 41 for raising and lowering the work table 6 by water pressure is provided on the deployment guide column 31 as the water pressure raising / lowering drive means 40 for raising and lowering the work table 6 by water pressure.

  The hydraulic cylinder 41 is a double-rod type that includes a cylinder tube 42 that supports the work table 6 and cylinder rods 43 that protrude from both ends of the cylinder tube 42.

  The upper and lower ends of the cylinder rod 43 are supported by the upper and lower blocks 34 and 35, respectively, and extend in parallel with the deployment guide column 31.

  A piston (not shown) is coupled to the middle of the cylinder rod 43. Two hydraulic chambers (not shown) are defined inside the cylinder tube 42 by the piston, and the hydraulic piping 12 is connected to each hydraulic chamber. In the hydraulic cylinder 41, the cylinder tube 42 moves with respect to the cylinder rod 43 due to a hydraulic pressure difference guided to each hydraulic chamber.

  The work table 6 is coupled to the cylinder tube 42 and moves up and down together with the cylinder tube 42 by the operation of the hydraulic cylinder 41 as indicated by arrows in the figure.

  The work table 6 is locked to rotate with the cylinder tube 42 at the back surface thereof in sliding contact with the deployment guide column 31.

  Various types of attachments are attached to the work table 6 in accordance with a work process for performing a maintenance inspection of the inner wall 53 of the shroud 50. For example, a camera is attached to the work table 6 when the inner wall 53 of the shroud 50 is inspected. A cleaning tool is attached to the work table 6 when the inner wall 53 of the shroud 50 is cleaned. When repairing the inner wall 53 of the shroud 50, for example, a laser welding machine or the like is attached to the work table 6.

  Next, the operation of the nuclear reactor inspection robot 1 will be described.

When the reactor inspection robot 1 is carried in, the hydraulic cylinder 25 is fully extended so that the links 21 and 22 are folded so that the work table 6, the deployment guide column 31, and the hydraulic cylinder 41 approach the swivel column 4. Held in the retracted posture. The nuclear reactor inspection robot 1 in the retracted position is suspended by a crane and is installed between the upper lattice plate 51 and the lower lattice plate 52 through the lattice holes of the upper lattice plate 51. The lower base stand 17 is seated on the lower grid plate 52 while being seated on the lower seat 51. Accordingly, the upper and lower ends of the swivel support column 4 are supported so as to be rotatable with respect to the upper lattice plate 51 and the lower lattice plate 52 via the upper swivel base 3 and the lower swivel base 16.

  When the reactor inspection robot 1 is operated, the hydraulic motor 8 is rotated by the pressurized hydraulic water supplied and discharged from the hydraulic unit through the hydraulic pipe 10, and the upper swivel base 3 is rotated through the speed reducer 9. . As a result, the turning column 4 turns around the vertical axis as shown by the arrow in the figure, and directs the work table 6 in a predetermined direction.

  Subsequently, the hydraulic cylinder 25 is contracted by the pressurized hydraulic water supplied and discharged from the hydraulic unit via the hydraulic pipe 11 to expand the links 21 and 22 into an X shape. As a result, the workbench 6 moves in the horizontal direction as indicated by the arrows in the figure.

  Subsequently, the hydraulic cylinder 41 is operated by pressurized hydraulic water supplied and discharged from the hydraulic unit through the hydraulic pipe 12, and the work table 6 is moved vertically along the inner wall 53 of the shroud 50 as indicated by an arrow in the figure. Moving.

  Thus, when the work table 6 is arranged at a predetermined position close to the inner wall 53 of the shroud 50, the attachment attached to the work table 6 performs work underwater by remote control.

  When the installation position of the reactor inspection robot 1 is changed, the hydraulic cylinder 25 is fully extended, the links 21 and 22 are folded, and the deployment guide column 31 and the hydraulic cylinder 41 are moved closer to the swivel column 4 and folded. The stowed storage posture is set. The reactor inspection robot 1 in this retracted posture is pulled up by a crane, extracted from the lattice hole of the upper lattice plate 51, and then inserted from another lattice hole, thereby changing the installation position.

  Similarly, when the reactor inspection robot 1 is carried out, the reactor inspection robot 1 in the retracted posture is pulled up by the crane.

  As described above, in the present embodiment, the reactor inspection robot 1 moves the work table 6 inside the cylindrical shroud 50 constituting the nuclear reactor, and the swivel support column 4 inserted into the shroud 50. And a hydraulic swivel drive means 7 for rotating the swivel support column 4 around the vertical axis by water pressure, a hydraulic pressure expansion drive means 20 for deploying the work table 6 from the swivel support column 4 by water pressure, and the work table 6 is moved up and down by the water pressure. A hydraulic pressure raising / lowering drive means 40 is provided, and the work table 6 is moved along the inner wall 53 of the shroud 50.

  Based on the above configuration, all of the hydraulic swivel driving means 7, the hydraulic pressure expansion driving means 20, and the hydraulic pressure raising / lowering driving means 40 are unified into a mechanism that operates by pressurized hydraulic water supplied and discharged by the hydraulic unit, so that it has excellent controllability. At the same time, maintenance and maintainability can be improved. Since working water (water) is used as the working fluid, even if this working water leaks into the shroud 50, the water stored in the shroud 50 is not contaminated, and the environmental load is extremely low. A highly secure system can be provided.

  In the present embodiment, the hydraulic swivel driving means 7 rotates the upper support base 2 installed on the upper lattice plate 51 provided inside the shroud 50 and the swivel support column 4 with respect to the upper base base 2 by water pressure. It was set as the structure provided with the hydraulic motor 8 to drive.

  Based on the above configuration, the hydraulic motor 8 that is rotated by water pressure rotates the revolving support column 4 around the vertical axis, so that the work table 6 moves in the circumferential direction of the inner wall 53 of the shroud 50 and the position of the work table 6 is changed. It can be controlled with high accuracy.

  In this embodiment, the hydraulic pressure deployment drive means 20 includes a link mechanism 5 that intersects in an X-shape and a hydraulic cylinder 25 that expands and contracts the link mechanism 5 with water pressure, and the work table 6 is deployed via the link mechanism 5. The configuration.

  Based on the above configuration, the hydraulic cylinder 25 that expands and contracts by hydraulic pressure expands and contracts the link mechanism 5, so that the work table 6 moves between the swivel column 4 and the inner wall 53 of the shroud 50, and the position of the work table 6 is accurately adjusted. Can be controlled.

  In the present embodiment, the hydraulic pressure raising / lowering drive means 40 includes a hydraulic cylinder 41 that raises and lowers the work table 6 with water pressure. The hydraulic cylinder 41 protrudes from both ends of the cylinder tube 42 that supports the work table 6 and the cylinder tube 42. The cylinder rod 43 is configured so that both ends of the cylinder rod 43 are supported by the hydraulic pressure expansion driving means (the expansion guide column 31).

  Based on the above configuration, the cylinder tube 42 is moved in the vertical direction by water pressure, so that the work table 6 is moved in the vertical direction along the inner wall 53 of the shroud 50 and the position of the work table 6 can be accurately controlled. .

  The double rod type hydraulic cylinder 41 has a function of supporting the work table 6 so as to be movable up and down with respect to the hydraulic pressure expansion drive means (deployment guide column 31). There is no need to provide it, and the support rigidity of the work table 6 is sufficiently secured.

(Second Embodiment)
Next, another embodiment shown in FIGS. 2 and 3 will be described. FIG. 2 is a perspective view showing a schematic configuration of the shroud constituting the nuclear reactor and the reactor inspection robot 1, and FIG. 3 is a perspective view showing a schematic configuration of the nuclear reactor inspection robot 1. In addition, the same code | symbol is attached | subjected to the same component as embodiment of the said FIG.

  As shown in FIG. 2, the nuclear reactor inspection robot 1 includes a swing column 4 that is rotationally driven by a hydraulic motor 8, and first and second hydraulic cylinders 60 and 70 that are supported by the swing column 4.

  As shown in FIG. 3, the first and second hydraulic cylinders 60 and 70 are double rod type in which the cylinder rods 61 and 71 protrude from both ends of the cylinder tubes 62 and 72, respectively.

  Vertical swing plates 81 and 82 are coupled to the upper and lower ends of the swing column 4. The upper and lower ends of the cylinder rods 61 and 71 are supported by the upper and lower turning plates 81 and 82, respectively, and are installed in parallel with the turning column 4.

  Pistons (not shown) are coupled to the middle of the cylinder rods 61 and 71, respectively. Two hydraulic chambers (not shown) are defined inside the cylinder tubes 62 and 72 by the piston, and hydraulic pipes are connected to the respective hydraulic chambers. In the first and second hydraulic cylinders 60 and 70, the cylinder tubes 62 and 72 move with respect to the cylinder rods 61 and 71, respectively, due to a difference in water pressure introduced from the hydraulic unit 80 to each hydraulic chamber.

  In this way, the cylinder tubes 62 and 72 constitute the first and second moving parts that are moved along the turning column 4 by the first and second hydraulic cylinders 60 and 70, respectively.

  The first and second hydraulic cylinders 60 and 70 are not limited to this, and a single rod type in which the cylinder rod protrudes from only one end of the cylinder tube may be used. In this case, the cylinder rod constitutes first and second moving parts that are moved along the swivel support column 4 by the first and second hydraulic cylinders 60 and 70, respectively.

  The work table 6 is coupled to the cylinder tubes 62 and 72 via the first and second arms 63 and 73. The first and second arms 63 and 73 have respective proximal ends connected to the cylinder tubes 62 and 72 so as to be rotatable, and respective distal ends connected to the work table 6 so as to be rotatable.

  When the first and second hydraulic cylinders 60 and 70 change the distance between the cylinder tubes 62 and 72, the sandwiching angle (intersection angle) of the first and second arms 63 and 73 is changed, and the work table for the swivel strut 4 is changed. The distance of 6 changes.

  Next, the operation of the nuclear reactor inspection robot 1 will be described.

  When the reactor inspection robot 1 is carried in, the cylinder tube 62 of the first hydraulic cylinder 60 is raised and the cylinder tube 72 of the second hydraulic cylinder 70 is lowered by the pressurized hydraulic water supplied and discharged from the hydraulic unit 80. The first and second arms 63 and 73 are folded so as to extend along the swivel support column 4 with the sandwiching angle being increased, and the work table 6 is held in the retracted posture approaching the swivel support column 4. The nuclear reactor inspection robot 1 in the retracted posture is suspended by a crane and installed between the upper lattice plate 51 and the lower lattice plate 52 through the lattice holes of the upper lattice plate 51.

  When the nuclear reactor inspection robot 1 is operated, the hydraulic motor 8 is rotated by the pressurized hydraulic water supplied and discharged from the hydraulic unit 80 to rotate the swivel support column 4. As a result, the turning column 4 turns around the vertical axis as shown by the arrow in the figure, and directs the work table 6 in a predetermined direction.

  Subsequently, by operating the cylinder tube 62 of the first hydraulic cylinder 60 and the cylinder tube 72 of the second hydraulic cylinder 70 so as to approach each other by the pressurized hydraulic water supplied and discharged from the hydraulic unit 80, the first and first The two arms 63 and 73 are deployed with the sandwiching angle being reduced, and the work table 6 moves away from the swivel support column 4 and approaches the inner wall 53 of the shroud 50.

  Subsequently, the cylinder tubes 62 and 72 of the first and second hydraulic cylinders 60 and 70 are moved in the same direction by the pressurized hydraulic water supplied and discharged from the hydraulic unit 80, and the work table 6 is indicated by an arrow in the figure. It moves in the vertical direction along the inner wall 53 of the shroud 50. At this time, the sandwiching angle between the first and second arms 63 and 7 does not change, and the distance of the work table 6 to the inner wall 53 of the turning column 4 and the shroud 50 is kept constant.

  Thus, when the work table 6 is arranged at a predetermined position close to the inner wall 53 of the shroud 50, the attachment attached to the work table 6 performs work underwater by remote control.

  When the installation position of the nuclear reactor inspection robot 1 is changed, the cylinder tube 62 of the first hydraulic cylinder 60 and the cylinder tube 72 of the second hydraulic cylinder 70 move (elevate) away from each other, and the first and first The two arms 63 and 73 are folded along the swivel support column 4, and the work table 6 is held in the retracted position approaching the swivel support column 4. The reactor inspection robot 1 in this retracted posture is pulled up by a crane, extracted from the lattice hole of the upper lattice plate 51, and then inserted from another lattice hole, thereby changing the installation position.

  Similarly, when the reactor inspection robot 1 is carried out, the reactor inspection robot 1 in the retracted posture is pulled up by the crane.

  As described above, in the present embodiment, the hydraulic pressure expansion drive means 20 includes the first and second hydraulic cylinders 60 and 70 supported by the swivel strut 4 and the swivel struts by the first and second hydraulic cylinders 60 and 70. 4, the first and second moving parts (cylinder tubes 62 and 72) moved along the first and second moving parts (cylinder tubes 62 and 72) and the first and second work parts connected between the work table 6. The first and second hydraulic cylinders 60 and 70 change the distance between the first and second moving parts (cylinder tubes 62 and 72) and the first and second arms 63 and 73 are provided. The sandwiching angle was changed.

  Based on the above configuration, the first and second hydraulic cylinders 60 and 70 operate in the opposite directions in synchronization with each other, so that the first and second arms 63 and 73 are deployed with the pinching angle being reduced. The table 6 approaches the inner wall 53 of the shroud 50, and the position of the work table 6 can be controlled with high accuracy.

  In the present embodiment, the hydraulic pressure raising / lowering drive means 40 is configured such that the first and second hydraulic cylinders 60 and 70 move the first and second moving parts (cylinder tubes 62 and 72) in the same direction.

  Based on the above configuration, the first and second hydraulic cylinders 60 and 70 operate in synchronization with each other, and the first and second moving parts (cylinder tubes 62 and 72) move in the same direction. While the angle between the two arms 63 and 73 does not change and the distance between the worktable 6 and the inner wall 53 of the revolving support 4 and the shroud 50 is kept constant, the worktable 6 moves up and down, and the position of the worktable 6 is accurately determined. Can be controlled.

  Thus, in the nuclear inspection robot 1, the first and second arms 63, 73 moved by the first and second hydraulic cylinders 60, 70 have both the hydraulic pressure expansion driving means 20 and the hydraulic pressure raising / lowering driving means 40. Since it is configured, the structure can be simplified and made compact.

  In this embodiment, the 1st, 2nd hydraulic cylinders 60 and 70 which comprise the hydraulic expansion | deployment drive means 20 and the hydraulic pressure raising / lowering drive means 40 are provided with the cylinder tubes 62 and 72 as a 1st, 2nd moving part, This cylinder First and second arms 63 and 73 are connected to the tubes 62 and 72, respectively, and cylinder rods 61 and 71 projecting from both ends of the cylinder tubes 62 and 72 are provided. It was set as the structure supported by.

  Based on the above-described configuration, the first and second hydraulic cylinders 60 and 70 are configured so that the upper and lower ends of the cylinder rods 61 and 71 are supported by the swivel support column 4. It is not necessary to provide a guide mechanism or the like that supports the first and second moving parts (cylinder tubes 62 and 72).

  The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

DESCRIPTION OF SYMBOLS 1 Reactor inspection robot 2 Upper base stand 3 Upper swivel stand 4 Swivel support 5 Link mechanism 6 Work table 7 Hydraulic swivel drive means 8 Hydraulic motor 9 Reducer 20 Hydraulic expansion drive means 25 Hydraulic cylinder 31 Deployment guide support 40 Hydraulic lift drive Means 41 Hydraulic cylinder 42 Cylinder tube 43 Cylinder rod 50 Shroud 51 Upper lattice plate 52 Lower lattice plate 53 Shroud inner wall
60 1st hydraulic cylinder 61 Cylinder rod 62 Cylinder tube (first moving part)
63 First arm 70 Second hydraulic cylinder 71 Cylinder rod 72 Cylinder tube (second moving part)
73 Second arm

Claims (7)

A reactor inspection robot that moves a work table inside a cylindrical shroud constituting a nuclear reactor,
A swivel post inserted into the shroud;
Hydraulic swivel drive means for rotating the swivel strut about the vertical axis by water pressure;
Water pressure deployment drive means for deploying the work table from the swivel strut by water pressure;
Water pressure raising and lowering drive means for raising and lowering the work table by water pressure,
A reactor inspection robot characterized in that the work table is configured to move along an inner wall of a shroud. The hydraulic swivel driving means is
An upper base stand installed on an upper lattice plate provided inside the shroud;
The nuclear reactor inspection robot according to claim 1, further comprising: a hydraulic motor that rotationally drives the swivel strut with water pressure with respect to the upper base table. The hydraulic pressure expansion drive means is
A link mechanism crossing the X-shape;
A hydraulic cylinder that expands and contracts the link mechanism by hydraulic pressure,
The reactor inspection robot according to claim 1, wherein the work table is deployed via the link mechanism. The hydraulic pressure raising / lowering driving means includes a hydraulic cylinder that raises and lowers the work table by hydraulic pressure,
This hydraulic cylinder
A cylinder tube that supports the work table;
A cylinder rod protruding from both ends of the cylinder tube,
The reactor inspection robot according to any one of claims 1 to 3, wherein both ends of the cylinder rod are supported by hydraulic pressure expansion drive means. The hydraulic pressure expansion drive means is
First and second hydraulic cylinders supported by the swivel struts;
First and second moving parts moved along the swivel strut by the first and second hydraulic cylinders;
The first and second arms connected between the first and second moving parts and the work table,
3. The configuration according to claim 1, wherein the first and second hydraulic cylinders are configured to change a sandwiching angle between the first and second arms by changing a distance between the first and second moving parts. Robot for nuclear reactor inspection.   6. The reactor inspection robot according to claim 5, wherein the hydraulic pressure raising / lowering driving means is configured such that the first and second hydraulic cylinders move the first and second moving parts in the same direction. The first and second hydraulic cylinders are
A cylinder tube is provided as the first and second moving parts,
It has a cylinder rod that protrudes from both ends of this cylinder tube,
The nuclear reactor inspection robot according to claim 6, wherein both ends of the cylinder rod are supported by the swivel support column.