JPS60244897A - Gripper for fuel exchanger - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field to which the Invention Pertains] The present invention relates to a gripping device for a refueling machine for moving in and out of a reactor vessel internal components and the like arranged in a nuclear reactor vessel having a standpipe.

[Prior art and its problems]

Conventionally, when replacing reactor components housed in the reactor vessel of nuclear power generation equipment, such as fuel rods and control rods, the structure of each reactor, i.e. the type of coolant, the size of the reactor components, and Depending on the arrangement, type of shielding plug in the reactor vessel, etc., refueling machines have been used that have loading devices for the reactor components appropriate thereto. However, conventional refueling machines generally handle fuel rods and control rods that are rod-shaped and have a small cross-sectional area, and these are reactor components of equal size and shape. The gripper of the gripping device for gripping and releasing the component only had to have a single function. Furthermore, if a transfer sleeve or the like is required to transfer these in-furnace components, a method of handling them using other devices is used. However, in high-temperature gas reactors, the reactor components are exchanged by moving the reactor vessel in and out through a stand pipe installed vertically in the reactor vessel. A gripping device that can handle devices of different geometries, such as sleeves, is required from the viewpoint of manufacturing costs and space factors.

[Purpose of the invention]

In view of the above-mentioned points, the present invention provides a refueling machine for a high-temperature gas reactor that grips and releases cylindrical equipment, such as a transfer sleeve, in addition to the internal components of the reactor, such as a transfer sleeve, etc. The object of the present invention is to provide a gripping device that can be used in various ways.

[Summary of the invention]

The above purpose is to provide a first gripper that is moved up and down by a wire rope passing through the main body to grip and release the reactor internal components, and a first gripper and a shaft that surround the first gripper. A gripping device for a refueling machine is provided with a gripping mechanism portion comprising a second gripper having a common core, connected to the main body portion, and gripping and releasing a cylindrical body device having a different size from the reactor internal components. The work will be achieved.

[Embodiments of the invention]

The present invention will be described in detail below based on the drawings.

FIG. 1 is a sectional view of a gripping device for a high temperature gas reactor refueling machine equipped with a gripping mechanism according to the present invention.

In FIG. 1, reference numeral 1 indicates the main body of the gripping device, and reference numeral 2 indicates the gripping mechanism. The main body part 1 and the gripping mechanism part 2 are suspended and supported by a parallel link mechanism pivotally supported by the main body part 1. In other words, the link 3 and the main body part are rotatable at the bin part between the bottle 1p of the support base 1b attached to the bottom plate 1a of the main body part 1 and the bottle 2p of the support plate 2b attached to the upper plate 2a of the gripping mechanism part 2. The bins ip, 2p, lq, and 2q are connected to a rotatable link 4, and the quadrilateral made up of the bins ip, 2p, lq, and 2q is a parallelogram. A 7-brocket 5 whose rotation center is on the center line of the main body 1 is provided on the support base 1b coaxially with the bin 1p, and the lower end of the link chain 6.6a is fixed to the sprocket 5.

A gripping device consisting of a main body part 1 and a gripping mechanism part 2 simultaneously moves a link chain 6.6a inside a guide pipe 7 provided in a distant pipe by a drive device (not shown) disposed above outside the standpipe. rise.

By lowering it, the reactor components within the reactor vessel can be reached. In addition, by winding up one side of the link chain 6.6a and lowering the other side to rotate the sprocket 5, the link mechanism consisting of the movable links 3 and 4 is rotated with the bins ip and Iq as fixed axes, and the grip device 2 is rotated. It is moved upward from a position directly below the center line of the main body part 1. By placing the movable links 3 and 4 in a horizontal position, the distance between the center lines of the main body 1 and the gripping mechanism 2 becomes the length between the bin portions of the links 3 and 4. In this case, the movement of the movable links 3, 4 is stopped in the vertical or horizontal position by the movable links 3 contacting the limit switches 3a, 3b, respectively.

Reference numeral 8 designates a first gripper of the gripping mechanism section 2, which is attached to a gripper operating device 9. The second gripper includes a gripper operating device 9 and a casing 2b of the gripping mechanism section 2.
The pole latch mechanism 10 includes an inner shapeable ball 2C interposed between the pole latch mechanism 10 and the inner shapeable ball 2C.

A wire rope 12 is attached to the grip 9a at two places on the upper part of the gripper operating device 9, and a guide roller 12a,
The gripper operating device 9 and the first
Lifting and hanging of the gripper 8 is carried out by the lower limit position of the sleeve 11, and the lever is stopped by the lower limit switch 11b.

Now, in order to use the gripping device to handle the internal components of the furnace, the link chain connected to the sprocket 5 is hoisted up, the link chain 6a is hoisted down, the tin rocket 5 is rotated clockwise, and the parallel linkage device is moved. , the movable links 3 and 4 are placed in a vertical position, the gripping mechanism section 2 is placed directly below the main body section 1, and the inside of the guide tube 7 inserted into a stand pipe (not shown) is lowered, and the guide tube 7 is moved downward. Main body part 1 in Chito 7a
and position it. This position is shear wire rope 12
the gripper operating device 9 is lowered, and the tip of the first gripper 8 is inserted into a grip provided at the upper end of the furnace component (not shown) to move the furnace component to the first position.
gripper 8.

The structure of the first gripper 8 includes three claws 1 as shown in the cross-sectional view of FIG. 2 and FIG.
4, and by rotating the pin 14p, the pawl 14 opens and closes outward. In FIG. 2, the right side of the center line shows the open state of the claws 14, that is, the gripping state of the furnace components, and the left side of the center line shows the closed state of the claws 14, that is, the released state of the furnace components. There is. 3 claws 1
4 are respectively joined to the operating rod 13a, and these are connected to the operating rod 13.

To open the claw 14 from closed, lower the operating rod 13, align the lower end of the claw 14 with the tapered part of the guide 15, and then open the claw 14.
Rotate around the pin 14p and move it outward to open it. When the operating rod 13 is raised to change from open to closed, the pawl 14 rotates around the pin 14p due to the position of the center of gravity and moves toward the center line, thereby closing.

Therefore, the first gripper 8 is required for handling the furnace components.
into the grip of the in-furnace component, and then press the operating rod 13.
is lowered to open the claws 14, the furnace components are gripped by the first gripper 8, and the wire rope 12 is wound up and lifted to the upper limit position of the gripper operating device 9. The internal components of the high-temperature gas furnace are hexagonal, but the sleeve 1
Since the inside of 1 is hexagonal, the components inside the furnace are housed inside. Next, the link chain 6.6a and the wire rope 12 are wound up and the gripping device is raised in the guide tube 7, so that the reactor components can be taken out of the reactor vessel.

Note that the core of a high-temperature gas reactor has hexagonal reactor components arranged and stacked in a honeycomb shape, so other reactor components are arranged on each side of the hexagon of the above-mentioned reactor components. That will happen. Therefore, depending on the reactor structure, these adjacent reactor components must be handled using a single standpipe to move the gripping device in and out. To do this, the link chain 6 is wound down, the link chain 6a is wound up, and the sprocket 5 is rotated to the left, thereby changing the movable links 3 and 4 from vertical to horizontal positions. At this time, pins 1p and 2 of the movable link
By making the distances between p and 1q and 2q the same as the distance between the centers of the respective grips of adjacent hexagonal core components, handling can be facilitated. Note that there are six adjacent furnace components, and the core of the grip of each furnace component is at a position 60 degrees different from the core of the grip of the furnace component directly below the stand pipe.
This angular movement can be performed by a rotating device of the fuel exchanger (not shown).

FIG. 4 is a partial sectional view showing how the second gripper 10 handles the transfer sleeve, which is a cylindrical device. The transfer sleeve accommodates the reactor components stacked in multiple stages, and the transfer sleeve is housed in a magazine (not shown) of the fuel exchanger to transfer the reactor components to another location outside the reactor vessel. It is something. In FIG. 4, the right side of the center line shows the gripping state of the transfer sleeve 16 by the second gripper 10, and the left side shows the released state.

The inner diameter of the grip portion 16a of the transfer sleeve 16 is provided with steps of different dimensions, each consisting of an inner crotch 16b, a middle tier 16C, and a lower tier 16d. When the transfer sleeve 16 is lowered and inserted in the state shown in the figure and reaches the bottom surface, it will be in the state shown to the left of the center line in FIG. 4.

Then, when the gripper operating device 9 is raised, three
By raising the shield ball 2C, the ball 2C is held in contact with the shoulders formed by the middle stage 16C and the upper stage 16b of the guide sleeve, and can grip the guide sleeve 16. Release of the guide sleeve 16 is obtained by carrying out the operation opposite to that described above.

The guide tube 7 shown in FIG. 1 provided in the standpipe can also be handled by the second gripper by having the same grip structure as the guide sleeve.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the gripping devices of the fuel exchanger have different shapes and dimensions of the gripping portions, and have the same axis, so that the gripping devices can be gripped.

By providing the first and second grippers with means for releasing, the configuration 2 of the gripping part can be removed in addition to the furnace components.
Handling a wide variety of Z cylindrical bodies with different dimensions, such as transfer sleeves and guide tubes, can reduce equipment space.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a gripping device according to an embodiment of the present invention, FIG. 2 is a cross-sectional explanatory diagram of the operation of the first gripper according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view taken along line XX in FIG. , 4th
The figure is a cross-sectional explanatory view of a second gripper according to an embodiment of the present invention. 1: Main body, 2: Gripping mechanism, 8: First gripper,
lO: second gripper. Figure 1

Claims (1)

[Claims] A reactor equipped with a gripping device consisting of a gripping mechanism for gripping or releasing reactor internal components arranged in a reactor vessel having a standpipe, and a main body that supports the gripping mechanism and moves up and down and rotates. a first gripper that is moved up and down by a puller to grip and release components in the reactor; and a first gripper that surrounds the first gripper and is formed with a common axis with the first gripper and is connected to the main body. 1. A gripping device for a fuel exchanger, characterized in that the gripping mechanism includes a second gripper that grips and releases a cylindrical device having a different size from the reactor internal components.