RU2684392C2 - Device for extracting fallen objects of nuclear reactor - Google Patents

Abstract

FIELD: atomic engineering.

SUBSTANCE: invention relates to atomic engineering. Device for extracting fallen objects of a nuclear reactor contains a movable platform with a lifting device, an actuator, a vertical hollow rod and a gripping means comprising gripping legs on the lower ends of two pivot levers that are articulated by protrusions made in the middle part of the levers. Levers are pivotally connected in the upper part with two links. Device contains a support frame where the drive is placed, equipped with cables, rods, and the traverse with two gripping means placed at ends thereof, connected to the cables, rods of the drive. Support frame in the upper part is connected with a lifting device, and in the lower part with a fixed section of a hollow rod, made telescopic. Movable section of the rod is connected with the cable-pitch of vertical movement thereof and in the lower part is connected pivotally with the middle part of the traverse. Each gripping device includes a hollow body with a slot, in the lower part of which an axis of the hinged connection of the protrusions of the two levers is located, and a movable load connected to the cable-traction located inside the body.

EFFECT: invention allows to increase the operational reliability, to ensure the possibility of adjusting the position of the gripping device, excluding damage to the object at the time of engagement.

1 cl, 8 dwg

Description

The invention relates to nuclear engineering, and in particular, to devices for lifting and moving fallen objects of a nuclear reactor, in particular, fallen fuel assemblies in water-filled holding pools, a reactor, spent nuclear fuel storage facilities without draining and completely unloading nuclear fuel.

A device is known for lifting and moving objects of a nuclear reactor, including lifting and moving fallen objects, containing a lifting device, with a gripper installed in a shape-like body of the object head and sliding tabs controlled by a rod, while the sliding tabs are mounted on an axis between the cheeks of the sleeve, which, in turn, is mounted and fixed on a shaft placed between the cheeks of the fork, located perpendicular to the cheeks of the sleeve, the fork is equipped with a shank mounted in the head, with the possibility of rotation I fork, sliding foot executed height exceeding the height of the upper tip of the fallen object that goes beyond the housing and provided with radiused jaws.

(RU 2553277, G21C 19/32, published 06/10/2015)

A disadvantage of the known device is its reduced operational reliability, since the capture of a fallen object is carried out by only one pair of sliding legs. In addition, the device is difficult to operate, since to capture a fallen object, it is necessary to additionally use a copy manipulator to rotate the threaded sleeve moving the sliding tabs to each other.

The closest in technical essence is a device for lifting and moving for lifting and moving, containing installed above the location of the fallen object, for example, a receiving pool, a movable platform with a running gear, a lifting device, a bar mounted on it, a protective hollow glass and a gripper mounted in the cavity of the protective cup, and the protective cup is attached to the lower part of the rod, the grip is equipped with a drive with reciprocating movement of the rod, placed in the cavity of the protective c Akana, and gripping tabs mounted on spring loaded pivot axes and the retracted position of the actuator stem formed on the inner diameter of the cross section of a head of the spent fuel assembly. The known device provides for the capture and extraction of fuel assemblies (fuel assemblies) that have fallen to the bottom of the pool. According to the figures of the known invention, the gripping legs are mounted on the lower ends of two pivotable levers pivotally connected by protrusions made in the middle part of the levers, the levers pivotally connected in the upper part with two links pivotally interconnected

(RU 2418329, G21C 19/10, published on 05/10/2011).

A disadvantage of the known technical solution is also its reduced operational reliability due to the capture of a fallen object only by a pair of sliding legs, as well as the use of a pneumatic cylinder as a gripper, the operability of which depends on the availability, serviceability and tightness of the compressed air supply line. This is due to the fact that there is a possibility of disengagement of the grip due to the weight of the fuel assembly and / or if the compressed air supply line is damaged (leaking), as a result of which the actuator rod spontaneously moves down due to its own weight and the grip is in the “open” position. In addition, the known device requires pre-setting manually the position of the gripping legs relative to the position of the head of the fuel assembly immediately at the moment of engagement of the fallen fuel assembly. It also reduces the operational reliability of the known device.

The objective and technical result of the invention is to increase operational reliability, as well as providing the possibility of regulating the position of the capture device, eliminating damage to the subject at the time of engagement.

The technical result is achieved in that the device for extracting fallen objects of a nuclear reactor comprises a movable platform with a lifting device, a drive, a vertical hollow rod and gripping means, including gripping paws at the lower ends of two pivotable levers connected by articulated protrusions made in the middle part of the levers, the levers are pivotally connected in the upper part with two links pivotally connected to each other, while the device further comprises a support frame, which is placed at water, equipped with ropes, rods, and a traverse with two gripping means placed at its ends connected to the ropes of the drive rods, the support frame in the upper part being connected to a lifting device, and in the lower part connected to a fixed section of a hollow rod made of telescopic wherein the movable section of the rod is connected to the pull rod of its vertical movement and in the lower part is pivotally connected to the middle part of the yoke, and each gripping means includes a hollow body with a slot in the lower part of which schena axis of articulation of the two arms of the projections, and disposed within the housing connected with a rope-traction movable load, the bottom of which is located the axis of articulation of the two links.

The technical result is also achieved by the fact that the drive is made in the form of a unit including rotary drums with pull ropes connected respectively to the movable section of the telescopic rod, with movable weights and with the ends of the beam.

In addition, in the drive unit, each drum can be connected to the drive gear via a latch and equipped with a hand brake, while the gears of the drums can be interconnected, as well as with handwheels and a gearbox.

The use of a more reliable mechanical drive in the device according to the invention, in which there are no pneumatic components, as well as two pairs of gripping legs, increases the operational reliability of the device for removing fallen objects of a nuclear reactor.

The invention is illustrated in figures 1-8, where:

- FIG. 1 is a general view of the device according to the invention with a fallen object in a horizontal position;

- FIG. 2 is a general view of the device according to the invention with a fallen object at an angle to the horizon;

- FIG. 3 - drive in the form of a block, including rotary drums with ropes, rods;

- FIG. 4 is a section AA of the drive of FIG. 3;

- FIG. 5 - capture device and traverse with the horizontal position of the fallen object;

- FIG. 6 - capture device;

- FIG. 7 - capture device and traverse when the position of the fallen object at an angle to the horizon;

- FIG. 8 - capture and traverse devices in isometry.

The device according to the invention contains the following elements:

1 - movable platform; 2 - lifting device; 3 - supporting frame with drive; 4 - drive; 5 - fixed hollow section of a vertical telescopic rod; 6 - movable hollow section of the rod; 7 - traverse; 8 - capture tool; 9 - a fallen item; 10 - rotatable drums; 11 - cable rods of rotary drums; 12 - gear wheels of the drums; 13 - a hollow body of the gripping means with a slot; 14 - flywheel; 15 - worm gear; 16 - articulated connection of the rod and traverse; 17 - movable cargo; 18 - rotatable lever; 19 - the axis of articulation of the protrusions of the rotatable levers; 20 - the axis of the articulation of the rotated levers and links; 21 - axis of articulation of links of the axis of the two levers; 22 - links; 23 - capture foot; 24 - connection traverse with ropes-rods.

A device for extracting fallen objects of a nuclear reactor contains (Fig. 1 and 2) a movable platform 1, a lifting device 2, mounted above the location of the fallen object of a nuclear reactor, for example, above a pool of water. The lifting device 2 is connected to the supporting frame 3. The supporting frame 3, connected in the upper part to the lifting device 2, in the lower part is connected to the fixed hollow section 5 of the vertical rod, made telescopic. The movable hollow section 6 of the rod is connected to the corresponding cable-rod 11 to move it vertically, and in the lower part it is pivotally connected 16 to the middle part of the beam 7 (Figs. 5 and 7).

The ends of the traverse 7 are connected to the ropes-rods 11 of the rotary drums 10 of the drive 4. By rotating the reels 10, winding or unwinding ropes-rods connected to the movable section 6 of the rod and the ends 24 of the traverse 7, reach both the movement of the traverse 7 vertically and its tilt to horizon level (Fig. 1, 2)

The drive 4 (Fig. 3, 4) is made in the form of a unit including a rotatable drum 10 with ropes-rods 11 connected to the corresponding movable elements of the device according to the invention. The drums 10 in the drive 4 are mounted on a support frame 3 with the possibility of rotation around their own axes, which can be implemented by known methods and mechanisms, for example, using gears 12, manually operated by means of the flywheels 14 and the worm gear 15 (Fig. 3 and four).

To ensure reliable capture of the fallen object at two points at the ends of the beam 7 placed means of capture 8.

Each gripping means (Fig. 6-8) includes a hollow body 13 with a movable load 17 located inside the body connected to the cable-rod 11. The gripping legs 23 are located on the lower ends of the two pivotable levers 18, pivotally connected 19 by protrusions made in the middle of the levers 18, and the levers 18 are pivotally connected in the upper part with two links 22 connected pivotally 21 to each other.

The axis 19 of the articulation of the protrusions of the two levers 18 is located in the lower part of the hollow body 13 made with a slot, and connected to it, and the axis 21 of the articulation of the two links 22 is located in the lower part of the movable load 17 and connected to it.

The implementation of the device for its intended purpose with the achievement of the set technical result can be illustrated by the following example.

To remove a fallen object 9, for example, a fuel assembly (FA) from the bottom of the pool, a device according to the invention containing a movable platform 1, a lifting device 2 (such as a crane) are placed together (above the place) of the fall of the fuel assembly. In this case, the support frame 3 with the drive 4, the vertical hollow telescopic rod 5, 6, the traverse 7 with the gripping means 8 is connected to the lifting device 2. In this case, the best connection is to hang the supporting frame 3 on the hook of the lifting device 2.

In this case, the movable hollow section of the rod 6 is in the initial raised (transport) position. All ends of the ropes-rods 11, wound on a rotatable drum 10, are connected respectively with the movable section 6 of the telescopic rod, with movable loads 17 and with the ends of the beam 7.

The movable load 17 is in the lowest position, which ensures the location of the links 22 at an angle to each other and the maximum distance between the divorced legs of the capture 23.

By rotating the handle of the worm gearbox 15, the drum is rotated, connected by a cable-tie to the movable section 6, lower the section 6 to the required level, while all the other cable-tie will go down.

To ensure the reliability of the fixation of the movable elements of the device according to the invention, the drive unit may further include drum clamps with pull ropes and ratchets.

When the fallen fuel assembly is located at an angle to the horizon by rotation of the corresponding drums 10, the ends of the cable rods 11 of which are connected to the ends of the beam 24, the beam 7 is installed parallel to the dropped fuel assembly.

After that, manipulating the movable platform 1 and the drive 4 provide a combination of the divorced legs of the capture 23 with the fallen fuel assembly.

Then, by rotating the corresponding drums 10, connected by ropes 11 with movable weights 17 located in the hollow housing of the gripping means, movable weights 17 are lifted. In doing so, the links 22, turning around their hinge axis 21, exert pressure in the hinges 20 on the upper parts of the levers 18, causing them to rotate about the axis of articulation of their protrusions 19 and the closure of the legs of the capture 23 on the fallen fuel assembly.

Monitoring the position of the gripping legs 23 and the smoothness of their progress during the process of gripping and retrieving a fallen object is monitored visually, including using a television tracking system.

After the reliable capture of the fuel assembly is completed, the ropes of the movable loads 11 are fixed and the fallen fuel assembly is hoisted.

Claims (2)

1. The device for extracting fallen objects of a nuclear reactor comprises a movable platform with a lifting device, a drive, a vertical hollow rod and gripping means, including gripping paws at the lower ends of two pivotable levers connected by articulated protrusions made in the middle part of the levers, the levers pivotally connected to the upper part with two links pivotally interconnected, characterized in that it further comprises a support frame on which the drive is located, equipped with ropes, rods, and tra two gripping devices mounted on its ends connected to the drive ropes, and the supporting frame in the upper part is connected to the lifting device and in the lower part is connected to the fixed section of the hollow rod made telescopic, while the movable section of the rod is connected to with a pulling rod for moving it vertically and in the lower part it is pivotally connected to the middle part of the traverse, and each gripping means includes a hollow body with a slot, in the lower part of which the pivot axis is located dressings of the two arms, and disposed within the housing connected with a rope-traction movable load, the bottom of which is located the axis of articulation of the two links. 2. The device according to p. 1, characterized in that the drive is made in the form of a unit including rotary drums with ropes, rods, respectively connected to the movable section of the telescopic rod, with movable weights and with the ends of the traverse.

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