RU2683581C2 - Device for extracting fallen objects of nuclear reactor - Google Patents

Abstract

FIELD: nuclear equipment.

SUBSTANCE: invention relates to atomic engineering. Device for removing fallen objects of a nuclear reactor comprises a movable platform with a lifting machine, drive, vertical hollow rod coupled with a gripper comprises gripping claws connected with swivel levers by a hinge joint. Device additionally contains a support frame with a ropes-rods equipped with a drive which is connected in the upper part to the lifting machine, and in the lower part – to a fixed hollow section of a telescopic bar. Movable section of the bar is connected to the rope-rod of its movement along the vertical line and in the lower part is connected to the gripping device, which includes a hollow body with a slot, equipped in its lower part with common axis of two levers and movable weight connected with a movable load by the rope-rod, which in lower part is made with two horizontal axes, arranged in slots of two levers on common axis and turning levers at moving the movable load. Gripping claws form a hinge joint with the levers and at the ends they have connection with the ropes-rods for their rotation.

EFFECT: invention makes it possible to adjust the gripping position of the device excluding damage to an object at the time of engagement.

1 cl, 6 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. 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 protective cup having a cavity open from the side of the pool, and a grip installed in the cavity of the protective glass, and the protective glass is attached to the lower part of the rod mounted on the lifting device, the grip is equipped with a reciprocating drive by the linear movement of the rod located in the cavity of the protective cup, and the gripping tabs are mounted on the spring-loaded rotary axes, and when the actuator rod is retracted, they form a section along the inner diameter equal to the section of the 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.

(RU 2418329, G21C19 / 10, published 05/10/2011).

A disadvantage of the known technical solution is its reduced operational reliability due to 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 a preliminary manual installation of the angle of inclination of the capture 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 connected to the gripping means, including the gripping legs connected to the swivel arms by a swivel connection, the device additionally comprising a support frame, with a drive placed on it equipped with ropes, which is connected in the upper part to a lifting device, and in the lower part to a fixed hollow section with a telescopic rod, wherein the movable rod section is connected to the pull rod vertically and in the lower part is connected to the gripping means, which includes a hollow body with a slot provided with a common axis of two levers in its lower part and a movable cable placed inside - vertical pull by a movable load, which in the lower part is made with two horizontal axes located in the grooves of two levers on a common axis and turning the levers when moving the movable load, and the gripping legs, about azuyut articulated connection levers at the ends have a connection to the cables, rods for rotation thereof.

The technical result is also achieved in that the drive is made in the form of a block including four rotatable drums with pull ropes connected respectively to a movable section of a telescopic rod, with a movable load, with one end of a pair of gripping legs, with the other end of a pair of gripping legs.

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, increases the operational reliability of the device for removing fallen objects of a nuclear reactor.

The implementation of the grip means hollow, the use of a moving load, the placed load in the grip cavity, the supply of the moving load with two axles, with the possibility of moving the specified axes along the grooves of the levers, the supply of levers with curved grooves, the pivoting of the levers on one common axis, the articulation of the legs of the grippers with levers triggering of the capture when the control load is at the bottom, which reduces the likelihood of uncoupling the grippers and increases the reliability of fixation in the capture of the extracted object but. It also increases the operational reliability of the generated result of intellectual activity.

The invention is illustrated in figures 1-6, 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 in an upright position;

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

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

- FIG. 5 - capture device;

- FIG. 6 is a capture device 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 - capture tool; 8 - a fallen item; 9-12 - rotatable drums; 13-16 - cable rods of rotary drums; 17-20 - gear wheels of the drums; 21 - a hollow body of the gripping means with a slot; 22 - flywheel; 23 - worm gear; 24 - the common axis of the two levers; 25 - rotatable levers of the gripping means; 26 - mobile load; 27 - horizontal axis of the moving load; 28 - grooves of levers; 29 - axis of articulation of the lever and the claw; 30 - grip legs.

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 cable-rod for moving it vertically, and in the lower part it is connected to the gripping means 7, which connects the device according to the invention to the fallen object of a nuclear reactor, for example, to a fuel assembly (fuel assembly 8).

In this case, the drive 4 (Fig. 3) is made in the form of a unit including four rotatable drums 9-12 with ropes-rods 13-16. The drums 9-12 in the drive 4 are mounted on a support frame 3 with the possibility of rotation around their own axes, which can be realized by known methods and mechanisms, for example, using gears 17-20, manually operated by means of the flywheels 22 and the worm gear 23 ( Fig. 3 and 4).

The cable rod 13 of one of the drums, for example, the drum 9, is connected to the movable section 6 of the vertical rod, while rotating the drum moving the movable section 6 and the gripping means 7 connected to it vertically.

The gripping means (working head of the device) 7 (Figs. 5 and 6) includes a hollow body 21 with a slot, provided in its lower part with a common axis 24 of two levers 25, as well as a connected cable rod, for example, a cable rod 14 with a drum 10 , a movable load 26, placed inside the hollow body 21.

In the lower part, the movable load 26 is made with two horizontal axles 27, which are placed in the grooves 28 of the levers 25, which are mounted on a common axis 24.

The gripping means 7 also includes gripping tabs 30 connected to the levers 25 by a pivot joint along an axis 29, for example, an articulated pivot joint. To carry out a rotation around the axis 29, the gripping legs 30 at the ends are provided with a connection with pull ropes, for example, ropes 15 and 16.

Performing a vertical hollow rod telescopic in combination with a mechanical drive and a gripping means that allows you to accurately bring the gripping paws to the fallen object at different angles of its position in space, ensures the achievement of the technical result.

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, 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 supporting frame 3 with the drive 4, the vertical hollow telescopic rod 5, 6 with the gripping means 7 is connected to a lifting device. In this case, the most optimal connection is the hanging of the support 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 13-16, wound on four rotatable drums 9-12, are connected respectively to the movable section 6 of the telescopic rod, with a movable load 26, with one end of a pair of gripping legs 15, with the other end of a pair of gripping legs 16. Moving load 26 is in the upper position, which provides a maximum distance between the gripping tabs 25.

By rotating the handle of the worm gear 23 rotate the drum connected by a cable-rod with a movable section 6, lower the section 6 to the required level, while all other cable-rods 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.

- образное шарнирное соединения с рычагами, происходит вокруг оси 29 в сторону, зависящую от того какими тросами-тягами осуществляют их поворот. При этом устройство по изобретению позволяет осуществить поворот лапок захвата, как по часовой стрелке, так и против часовой стрелки, что обеспечивает точность и безопасность управления захватом.By rotating the corresponding drums, the gripping legs 30 are turned at an angle necessary to engage the legs with the fallen fuel assembly. The rotation of the claws 30, forming

- shaped swivel with levers, occurs around the axis 29 to the side, depending on which ropes, rods carry out their rotation. Moreover, the device according to the invention allows you to rotate the legs of the grip, both clockwise and counterclockwise, which ensures the accuracy and security of control of the grip.

After setting the grip tabs to the desired position, rotating the corresponding drum, lower the movable load 26, placed inside the hollow body 21 with a slot, provided with a common axis 24 of the levers 25 on the cable-pull rod. In this case, the horizontal axes 27 of the movable load are moved in curved grooves 28 levers, which leads to the rotation of the levers 25 relative to their common axis 24 and the closure of the legs of the gripper 30 on the fallen fuel assembly.

Monitoring the position of the gripping legs 30 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 assemblies is completed, the cable of the movable load 26 is fixed and the fallen fuel assembly is hoisted.

After installing the fallen object 8 in the storage place, to disengage with the fallen object in the reverse sequence of the capture operation.

Claims (2)

1. A device for extracting fallen objects of a nuclear reactor, comprising a movable platform with a lifting device, a drive, a vertical hollow rod connected to the gripping means, including the gripping legs connected to the swivel arms by a swivel connection, characterized in that it further comprises a support frame with it is equipped with a drive cable, which is connected in the upper part with a lifting device, and in the lower part - with a fixed hollow section of the rod made by telescope moreover, the movable section of the rod is connected to the cable-pull rod for moving it vertically and in the lower part is connected to the gripping means, which includes a hollow body with a slot provided in the lower part with a common axis of two levers and placed inside the movable cable connected to the cable-rod the load, which in the lower part is made with two horizontal axes placed in the grooves of two levers on a common axis and turning the levers when moving the moving load, and the gripping legs form a hinge connection with the levers and on ah have a connection to the cables, rods for rotation thereof. 2. The device according to p. 1, characterized in that the drive is made in the form of a unit comprising four rotary drums with ropes, rods connected respectively to a movable section of a telescopic rod, with a movable load, with one end of a pair of gripping legs, with the other end of a pair paws of capture.

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