JP2909402B2 - Sheave unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheave unit which is used for transferring equipment and the like from a non-workable area to a workable area in a nuclear power plant.

[0002]

2. Description of the Related Art FIG. 3 is an explanatory view of a conventional sheave unit used for transferring equipment and the like from a non-workable area to a workable area in a nuclear power plant. In the figure, a transfer cart 27 is provided on a sheave unit 25 for transferring a conveyed object 26 from an inoperable area to a workable area underwater, and an electric hoist 30 on an operation floor 29 and a wire The transport cart 27 is moved via the cart fixing jig 28 by the ropes 31, 32, sheaves 33, 34, 35 and the like.

[0003] The wire rope 3 of the sheave unit 25
1, 32 and the sheaves 33, 34, 35, etc., need to be regularly inspected and replaced. In order to lift the sheave unit 25 into the accessible area, the conventional sheave unit 25 has positioning pins 36 and set pins 37 at its ends. Has,
Each pin is inserted into each groove of the guide plates 38 and 39, and the set pin 37 is fixed by the lock pin 40. A lifting rod 41 is permanently provided at a position corresponding to the center of gravity A of the sheave unit 25. When the sheave unit 25 is to be lifted, first, the transfer cart 27 and the cart fixing jig 2
Then, the lock pin 42 is removed with an underwater tool (not shown). Next, the lock pin 40 of the set pin 37 is removed using an underwater tool. Then, the electric hoist 30 is operated to move the sheave unit 25 to the left in the drawing, and the positioning pin 36 and the set pin 37 are brought into contact with the left ends of the grooves of the guide plates 38 and 39, and the sheave is moved by a crane wire 43 (not shown). The unit 25 is lifted, moved into the workable area, and inspected.

[0004]

As described above, in the conventional sheave unit, the lifting rod 41 is always provided, which hinders the transfer of the conveyed object 26. The lifting rod 41 is a sheave unit 2.
5, the sheave unit 25 becomes longer than necessary to prevent interference with the partition wall.
Weight also increases. Further, since the lifting rod 41 is a rigid body, there is a risk of causing resonance. In addition, there is a danger since a considerable length is required and it must be shortened during lifting.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a sheave unit in which a sheave unit main body is installed below the floor and transports a conveyed product by remote control via a sheave. A lifting pin provided on the upper surface of the sheave unit main body, and a lifting jig suspended from above the floor to hold the lifting pin and lift the sheave unit main body.

A sheave unit according to the present invention is a sheave unit in which a sheave unit main body is installed below the floor and transports a conveyed object by remote control via a sheave, wherein a lifting pin provided on the upper surface of the sheave unit main body; A lifting jig suspended from above the floor to lift the sheave unit body by gripping the lifting pin, and a counterweight provided on the lifting jig to move the center of gravity of the sheave unit body to a position near the lifting pin. And a configuration comprising:

A sheave unit according to the present invention is a sheave unit in which a sheave unit main body is installed below the floor and transports a conveyed object by remote control via a sheave, wherein a lifting pin provided on an upper surface of the sheave unit main body; A lifting jig suspended from above the floor to grip the lifting pin and lift the sheave unit body, and a pair of chucks is opened and closed by movement of a top screwed with the lifting jig to a rotating shaft. The lifting pin is gripped by a gripping mechanism to lift the sheave unit body.

[0008]

That is, in the sheave unit according to the present invention, the lifting pins provided on the upper surface of the sheave unit main body in the sheave unit in which the sheave unit main body is installed below the floor and the conveyed object is remotely controlled via the sheave are mounted on the floor. The lifting jig suspended from the side grips the lifting pin to lift the sheave unit main body, and the lifting jig grips the lifting pin provided on the top of the sheave unit main body to hold the sheave unit. By lifting the main body, the conventional lifting rod always connected to the sheave unit main body can be eliminated.

In the sheave unit according to the present invention, the lifting pins provided on the upper surface of the sheave unit main body in the sheave unit in which the sheave unit main body is installed below the floor and which conveys a conveyed product by remote control via the sheave are mounted on the floor. The lifting jig suspended from the side grips the lifting pin and lifts the sheave unit body, and the counter weight provided on the lifting jig moves the center of gravity of the sheave unit body to the vicinity of the lifting pin. The lifting jig grips the lifting pin provided on the upper surface of the sheave unit main body and lifts the sheave unit main body, thereby eliminating the conventional lifting rod constantly connected to the sheave unit main body. . Also,
By moving the center of gravity of the sheave unit body to the vicinity of the lifting pin by the action of the counterweight, lifting of the sheave unit body becomes easy and there is no need to lift the sheave unit body near the original center of gravity. It can be shorter and lighter.

In the sheave unit according to the present invention, the lifting pins provided on the upper surface of the sheave unit main body of the sheave unit in which the main body of the sheave unit is installed below the floor and transports the conveyed product by remote control via the sheave are mounted on the floor. A lifting jig suspended from one side is lifted by a gripping mechanism that opens and closes a pair of chucks by moving a frame screwed to the rotating shaft, and lifts the sheave unit body. By lifting the sheave unit main body by gripping the lifting pins provided on the upper surface of the sheave unit main body, the conventional lifting rod constantly connected to the sheave unit main body can be eliminated. The lifting jig is moved by operating the rotating shaft of the gripping mechanism, and the pair of chucks is opened and closed, so that the lifting pin can be reliably and easily gripped to lift the sheave unit body.

[0011]

1 and 2 are explanatory diagrams of a sheave unit according to an embodiment of the present invention. In the figure, the sheave unit according to the present embodiment is used when transferring equipment and the like from a non-workable area to a workable area in a nuclear power plant, and transports a conveyed product 26 underwater from a workless area of a worker. A transfer cart (not shown) is provided on the sheave unit 25 for transferring to the workable area,
The transfer cart is moved via a cart fixing jig by an electric hoist, a wire rope, a sheave, or the like on the operation floor 9.

The wire ropes and sheaves of the sheave unit 25 need to be inspected and replaced periodically, and the sheave unit 25 is provided with a lifting jig 1 for lifting the sheave unit 25 into an accessible area. ing. As shown in FIG. 1, the lifting jig 1 is composed of a counterweight 2 and two sets of gripping mechanisms 3 and the like. A lifting metal 4 is provided on the upper surface of the counterweight 2. The lifting jig 1 is a lifting tool 6 for a crane hook 5.
Are suspended via a chain block 7. The gripping mechanism 3 is connected to the lifting pins 10 provided on the sheave unit 25 by manually operating the special tool 8 from the operation floor 9 by an operator. The center of gravity of the sheave unit 25 is point A, but the counter weight 2
As a result, the sheave unit 25 is stably lifted by the lifting jig 1 and moves safely without fail.

As shown in FIG. 2A, the gripping mechanism 3 comprises a chuck 11, a frame 12, a rotating shaft 13, a bush 14, a bearing 15, a guide cylinder 16, and the like. 11 is opened and closed. A pair of chucks 11 are provided facing each other, and pins 17 fixed to the lifting jig 1 are provided.
As shown in FIG. 3B, the chuck 11 is opened when the frame 12 descends, and as shown in FIG. 3C, the chuck 11 is raised. It is closed and connected to the lifting pin 10. The top 12 is fixed to the lower end of the rotating shaft 13,
The screw portion below the rotary shaft 13 is screwed through a screw 18 fixed to the bearing 15, and the top 12 is moved up and down by rotating the rotary shaft 13. At the lower end of the special tool 8 for operating the gripping mechanism 3, a socket 20 that fits into a prism at the upper end of the rotating shaft 13 is provided.
A plurality of positioning pins 21 are provided on the upper surface of the sheave unit 25 to perform positioning for setting and operating the gripping mechanism 3.

As described above, in the present sheave unit, the lifting jig 1 is provided with the counterweight 2 and the plurality of gripping mechanisms 3, and the lifting pins 10 corresponding to the gripping mechanisms 3 are provided on the upper surface of the sheave unit 25. The pair of chucks 11 are opened and closed by remote manual operation of the rotary shaft 13 of the screw shaft from the operation floor 9 using a special tool 8 for exclusive use, and the connection and release with the lifting pin 10 are performed. When lifting the sheave unit 25, the lifting tool 6 is provided on the crane hook 5, and the lifting jig 1 and the sheave unit 25 are lifted by a plurality of chains via the chain block 7 and moved to a predetermined position. When the lifting jig 1 and the sheave unit 25 are connected, the weight of the counterweight 2 is selected such that the center of gravity of the composite moves to the lifting jig 1 side. Thus, in a state where the lifting jig 1 is connected to the sheave unit 25, the center of gravity synthesized by the action of the counterweight 2 moves to the lifting jig 1 side, thereby facilitating movement by the crane. The lifting jig 1 and the sheave unit 25 are connected by operating the rotary shaft 13 of the screw shaft with a simple special tool 8 to operate the chuck 11 of the gripping mechanism 3.
Can be reliably and easily implemented by opening and closing. Further, by connecting the crane hook 5 and the lifting jig 1 via the chain block 7, the lifting jig 1
Adjustment of the distance to the camera can be easily performed.

In a conventional sheave unit, a lifting rod is permanently provided, which hinders the transfer of a conveyed object. Further, the lifting rod needs to be provided near the center of gravity of the sheave unit, and the sheave unit becomes longer than necessary to prevent interference with the partition wall, and the weight increases. In addition, the lifting rod may be resonated because it is a rigid body, and a considerable length is required and must be shortened during lifting, which poses a danger. Is attached to the end of the sheave unit 25 by a pair of chucks 11, the center of gravity is moved to the end by combining the counterweights 2, and the sheave unit 25 is lifted by the lifting jig 1. The lifting jig 1 is held by the chain block 7, and even if the sheave unit 25 is installed deep in the unworkable area, the center of gravity is combined by the counterweight 2 and moved into the workable area. , The sheave unit 25 can be lifted reliably and easily, and the sheave unit 25 can be lifted near the center of gravity A of the sheave unit 25. The length of the sheave unit 25 can be shortened to reduce the weight, and the chain length can be easily adjusted because the chain block 7 is used to lift the sheave unit 25. The operation is avoided, and the provision of the lifting jig 1 eliminates the conventional lifting rod which is always connected to the sheave unit 25, so that there is no fear that the lifting rod will resonate. There is no need to shorten the lifting rod during lifting, and it is safe, and the transported object can be easily transferred without being hindered by the lifting rod. Storing in a place does not hinder the transfer of goods.

[0016]

The sheave unit according to the present invention is constructed as described above, and can eliminate the conventional lifting rod which is always connected to the sheave unit body, so that it is obstructed by the lifting rod. The transfer of the conveyed material is easily performed without any trouble.

[Brief description of the drawings]

FIG. 1 is a front view of a sheave unit according to one embodiment of the present invention.

FIG. 2 (a) is a front view of the gripping mechanism, and FIGS. 2 (b) and 2 (c) are explanatory diagrams of its operation.

FIG. 3 is a front view of a conventional sheave unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lifting jig 2 Counterweight 3 Grasping mechanism 4 Hanging fitting 5 Crane hook 6 Lifting tool 7 Chain block 8 Special tool 9 Operating floor 10 Lifting pin 11 Chuck 12 Top 13 Rotating shaft 14 Bush 15 Bearing 16 Guide cylinder 17 Pin 18 Screw Hardware 20 Socket 21 Positioning pin

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B66C 1/62 B66C 1/66 B66D 1/34 B66D 1/60

Claims (3)

(57) [Claims] 1. A sheave unit in which a sheave unit main body is installed below the floor to transfer a conveyed object by remote control via a sheave, a lifting pin provided on an upper surface of the sheave unit main body, and a lifting member suspended from above the floor. A sheave unit comprising a lifting jig for gripping a pin and lifting the sheave unit body. 2. The sheave unit according to claim 1, further comprising a counter weight provided on the lifting jig for moving a center of gravity of the sheave unit main body to a position near the lifting pin. 3. The sheave unit main body is lifted by gripping the lifting pin by a gripping mechanism that opens and closes a pair of chucks by moving a top in which the lifting jig is screwed to a rotating shaft. The sheave unit according to claim 1.