JP2796452B2 - lift device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevating device used for inspection of a heat transfer tube bundle of a steam generator in a nuclear power plant or inspection at a high place in a thermal power plant or a ship.

[0002]

2. Description of the Related Art In a U-tube type steam generator of a pressurized water nuclear power plant, a plurality of baffle plates support a heat transfer tube bundle. In a typical steam generator, the first steam generator
The height of the baffle plate is about 1.5 m, but the height of the seventh baffle plate is about 9 m. The heat transfer tube bundle has an inverted U-shape at the top, and the gap between the heat transfer tubes having the minimum curvature is about 100 mm or more. In addition, the baffle plate has a rectangular opening about 20 mm narrower than the tube bundle.

Accordingly, to check the condition of the heat transfer tube bundle above the second baffle plate, an inspection tool is inserted horizontally from the opening of the steam generator shell plate, and then vertically inserted through the gap of the heat transfer tube bundle. Need to send upwards.

[0004] In general, when performing inspections at a high place in a thermal power plant or a ship, etc., it is common to install scaffolds. There is a need for an apparatus that can raise and lower a tool toward a predetermined inspection position.

[0005]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to be able to mount an attachment such as an inspection tool, and to assure a vertical movement of an attachment fed from a horizontal direction. An object of the present invention is to provide a small lifting device that can be used.

[0006]

In order to achieve the above object, an elevating device according to the present invention is constituted by connecting a plurality of tubular bodies in a bendable manner, and deforming a tip from a horizontal state to a vertically upward state. And a means for deforming the guide, and a plurality of box-like bodies are flexibly connected to each other, so that an attachment can be attached to a tip end thereof, and A trolley movable along the guide, means for moving the trolley, and for maintaining the trolley in a straight line after the trolley is fed out of the vertically upward tip of the guide. Means are provided.

[0007]

In the above construction, after the guide is fed to a predetermined position in a horizontal state, the tip is directed vertically upward, and the bogie is passed therethrough, so that the bogie is fed vertically upward. In addition, since the carriage after being sent out from the tip of the guide is maintained in a straight line, an attachment such as an inspection tool attached to the carriage is surely raised vertically to a desired position.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a lifting device according to the present invention will be described below in detail with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a guide for guiding the inspection tool 2 into the steam generator 3. The guide 1 is composed of a plurality of tubular bodies 4, and the distal and rear tubular bodies 4 a and 4 b are straight pipes having a rectangular cross section, and a plurality of intermediate pipes (3 in the illustrated embodiment).
One tubular body 4c _1, 4c _2, 4c ₃ of) is bent tube of rectangular cross section. The middle tubular body 4c ₁ , 4c ₂ , 4c ₃ constitutes a 90 ° elbow by joining adjacent end faces, and the rear tubular body 4c ₁
When b is arranged horizontally, the distal end tubular body 4a can be directed vertically upward (see FIG. 2). These tubular bodies 4
Are connected to each other by the shaft 5 on the side having a large radius of curvature (the back side) so as to be bendable. Therefore, the guide 1 can be deformed between the horizontal straight state shown in FIG. 1 and the bent up state shown in FIG. Wheels 6 are attached to both ends of the shaft 5 so as to be able to roll on the guide running rail 7. In the illustrated embodiment, the guide running rail 7 extends horizontally through a working hole 9 provided in a body plate 8 of the steam generator 3 to the inside thereof. still,
Reference numeral 10 is also a wheel that rolls on the guide running rail 7, and reference numeral 11 is an anti-lift wheel for preventing the rear tubular body 4b from floating when the distal tubular body 4a of the guide 1 rises. The I-shaped guide running rail 7 is fitted into a groove on the side.

A wire fixing portion 12, a wire guide 13, and a wire winder 14 are provided on the ventral side of the distal end tubular body 4a, the intermediate tubular body 4c, and the rear tubular body 4b of the guide 1, respectively. Wire fixing part 1 by wire winding machine 14
When the wire 15 fixed to 2 is pulled, the distal end tubular body 4a rises with the wheel 6 as a fulcrum, and its rear end face abuts on the front end face of the _first intermediate tubular body 4c1. Further, when winding the wire 15, the first intermediate tubular body 4c ₁ second
The intermediate tubular body 4c ₂ and the third intermediate tubular body 4c ₃ sequentially rise up, and finally the distal end tubular body 4a is in an upright state as shown in FIG.

In FIGS. 2 and 3, reference numeral 16 denotes a carriage to which the inspection tool 2 is attached at the tip. As shown in FIG. 3, the bogie 16 can be bent by a pivot pin 18 on one side (abdominal side when inserted into the guide 1) of a box-like body 17 having a rectangular cross section open at both ends. When the end faces are joined together, one straight straight pipe is formed. A guide roller 19 is attached to the outer end of the pivot pin 18 so as to follow a bogie rail 20 provided on an inner side surface near the ventral side of each tubular body 4 of the guide 1. Therefore, when the guide 1 is in the state shown in FIG.
When the truck 16 is fed along the bogie rail 20 from the opening, the bogie 16 changes its direction from the horizontal direction to the vertical direction, and is sent vertically upward from the upper opening of the distal end tubular body 4a of the guide 1.

The box-shaped body 17 of the truck 16 sent out from the distal end tubular body 4a of the guide 1 is positioned at the center of the back side of the distal end tubular body 4a so as not to rotate about the pivot pin 18. A pressure roller 21 is provided. A belt 23 having a plurality of holes 22 formed on both sides thereof at appropriate intervals is formed along the outside of the shaft 5 pivotally supporting the tubular body 4 of the guide 1 from the opening on the back side of the distal tubular body 4a. Pressure roller 21
To be sent to The hole 22 of the belt 23 is
The protrusion 2 attached to the back of each box 17 of the carriage 16
4 are formed at the same intervals as each other, so that each box-like body 17 of the carriage 16 is
1, the belt 23 is moved by the pressure roller 21 to the carriage 1.
6, the hole 22 can be fitted into the projection 24. After the holes 22 are fitted into the protrusions 24, as understood from FIG. 3, the belt 23 prevents the rotation of the box-shaped body 17 of the cart 16, so that the cart 16 remains in the position even after coming out of the guide 1. It can rise vertically while maintaining its condition. It is preferable that the belt 23 be made of a material having sufficient tensile strength and bendable in accordance with the curvature of the guide 1, for example, spring steel, rubber with wire, or the like. The lifting device 30
The end of the belt 23 is preferably wound in a coil shape to reduce the size of the belt.

Although various types of feeding means for the carriage 16 are conceivable, in the illustrated embodiment, the pressing roller 25 is used.
Are provided on both sides of the rearmost portion of the rear tubular body 4b of the guide 1. The feeding device 26 includes the carriage 16
A pressure roller 25 is pressed against the side surface of the motor, and an electric motor 27 for rotating the pressure roller 25. In this case, the rotational force of the pressure roller 25 is used as the propulsion force of the carriage 16 due to the friction between the pressure roller 25 and the carriage 16. A pinion gear, a chain, or the like may also be attached to the side surface to take measures to prevent slipping in the feeding device 26.

As will be apparent from the above description, the operation of the elevating device 30 having the above configuration will be described below.

When inspecting a heat transfer tube bundle (not shown) of the steam generator 3, first, the guide traveling rail 7 is horizontally inserted and fixed from the work hole 9 of the body plate 8 of the steam generator 3, and is fixed. The guide 1 is inserted along the guide rail 7 to a predetermined position inside the steam generator 3 (FIG. 1). Then
The handle of the wire winder 14 is turned to wind up the wire 15, the guide 1 is bent as described above, and the distal end tubular body 4 a is made vertical as shown in FIG. 2. In this state, the carriage 16 is inserted from the opening of the rear tubular body 4b, is disposed between the pressure rollers 25 of the left and right feeding devices 26, and the guide roller 19 is engaged with the carriage rail 20. After this,
When the feeding device 26 is operated, the carriage 16 moves in the guide 1 along the carriage rail 20, and its tip changes its traveling direction from a horizontal direction to a vertical direction. When the box 17 at the head of the carriage 16 reaches the pressure roller 21 in the tubular body 4a at the end of the guide 1, the box 17 at the end of the belt 23 already disposed therearound is inserted into the hole 22 at the end. Projection 24 is fitted. When the cart 16 is further fed, the belt 23 is pulled out from the coil portion 28 as the cart 16 moves, and the holes 22 of the belt 23 are sequentially placed in the corresponding box-like members 17.
Of each box-like body 17 of the carriage 16
Can be sent vertically upward from the opening of the distal end tubular body 4a in an integrated state, and the inspection tool 2 can be raised to a predetermined inspection position. The inspection tool 2 is connected to the steam generator 3 by a cable (not shown) passing through the inside of the carriage 16.
, And the inspection result is sent to an external recording device or the like.

When the inspection tool 2 is lowered, the work may be performed in the reverse procedure. However, in order to separate the belt 23 from the projection 24 of the carriage 16, the winding around the coil section 28 is performed simultaneously with the retraction of the carriage 16. It is also necessary to take it. When the belt 23 is pulled in this manner, as shown in FIG.
The belt 23 has a protrusion 2 due to the angle θ between
4 is automatically separated.

In the above embodiment, the elevating device 30 according to the present invention is used to inspect the upper part of the heat transfer tube bundle of the steam generator 3. However, other applications, for example, high-altitude inspection in thermal power plants and ships Etc. can also be used. Further, the attachment attached to the tip of the carriage 16 is not limited to the inspection tool 2, but may be a remote-operable welding machine.

[0018]

As described above, by using the elevating device according to the present invention, the condition of the upper part of the heat transfer tube of the steam generator, the inspection at a high place of a boiler, a ship or the like of a thermal power plant, or In addition, welding and maintenance at high altitudes are facilitated, which can greatly contribute to improving the reliability of large structures.

[Brief description of the drawings]

FIG. 1 is a side view showing an elevating device according to the present invention, showing a state where a guide is tilted horizontally.

FIG. 2 is a side view showing the elevating device according to the present invention, and is a diagram showing a state in which a distal end portion of a guide is vertically raised.

FIG. 3 is a schematic explanatory view showing an operation of the cart and a mechanism for holding the cart vertically.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Guide 2 Inspection tool (attachment) 4 Tubular body 15 Wire 16 Carriage 17 Box-shaped body 21 Pressure roller 23 Belt 24 Projection 26 Feeding device 30 Elevating device

Claims (1)

(57) [Claims] 1. A guide formed by connecting a plurality of tubular bodies in a bendable manner and capable of deforming a tip portion from a horizontal state to a vertically upward state, and a guide for deforming the guide. Means, a plurality of box-shaped bodies are connected to bendable, and an attachment is attached to the tip end, and
A truck movable along the guide; a means for moving the truck; and a device for maintaining the truck in a straight line after the truck has been sent out from a vertically upward end of the guide. Means for lifting, comprising: