RU2227335C2 - Actuator for refueling machine grips - Google Patents

Abstract

FIELD: nuclear power engineering; controlling fuel assembly and cluster grips in refueling nuclear reactors. SUBSTANCE: proposed design that can be used in refueling machine grip actuators provided with control elements actuated by separate rope drive has fuel assembly grip drum, cluster grip drum, and planetary gearing. Fuel assembly grip drum and cluster grip drum are mounted on common shaft; planetary gearing incorporating sun wheel and satellite with shaft is disposed within cluster grip drum; planetary gearing sun wheel is mounted inside shaft, and satellite shaft is fixed in its bosses. EFFECT: enhanced reliability and simplified design of actuator; reduced metal input. 1 cl, 3 dwg

Description

The invention relates to the field of nuclear energy, in particular, to designs of gripper drives for a reloading nuclear reactor machine for controlling FA capture and cluster capture, and can be used in drives having a regulatory body controlled by a separate cable drive.

The well-known "Scheme clamshell twin-engine winch with planetary gear" [1], which contains the locking and supporting drums, gearbox, motors and planetary gear.

The disadvantages of this winch are the large metal consumption and design complexity due to the presence of a planetary gear in a separate housing.

The prototype of the invention is the gripper drive of the overload device for a nuclear reactor according to the Japanese patent [2], which contains two drums and a gearbox with two planetary gears.

The disadvantage of this drive is its low reliability due to the fact that the gripper is controlled by the simultaneous operation of two drives, the complexity of the design, high metal consumption and high labor costs in its manufacture due to the presence of two planetary gears in a separate gear housing.

The present invention solves the problem of improving the reliability of the drive gripper machine reloading, simplifying its design and reducing metal consumption.

To achieve this result, in the reloading machine gripper drive containing the fuel assembly capture drum, the cluster capture drum and planetary gear, the fuel assembly capture drum and the cluster capture drum are located on the same shaft, the planetary gear including the central gear and satellite with the shaft is located in the cavity of the capture drum cluster, and the central gear of the planetary gear is installed inside the shaft, and the planetary gear satellite shaft is fixed in its protrusions.

The location of the fuel assembly capture drum and the cluster capture drum on the same shaft makes it possible to simplify the drive design, make it compact and reduce metal consumption by placing the planetary gear inside the cluster capture drum, because The planetary gear housing is a cluster capture drum. Placing the central gear inside the shaft, rigidly connected to the fuel assembly capture drum, also allows to simplify the design and reduce the metal consumption of the planetary gear due to the fact that it does not require a separate housing for attaching the bearings of the central gear shaft. The placement of the satellite shaft on the shaft protrusions also simplifies the design and reduces metal consumption, as a planetary gear carrier is not required due to the fact that its role is played by the shaft. The kinematics of the gripper drive of the reloading machine improves the reliability of the drive, because there is no need for the simultaneous operation of two drives, and therefore the possibility of a mismatch due to failures in the control system.

An analysis of the known technical solutions in the studied area shows that in drives the planetary gear is carried out in a separate housing and, accordingly, the drives have a complex structure and high metal consumption, which affects the additional costs of manufacturing the housing.

The distinguishing features of the proposed gripper drive from the prototype are: fuel assembly capture drum, cluster capture drum and planetary gear are located on the same shaft, the planetary gear including the central gear and the satellite with the shaft is located in the cavity of the cluster capture drum, the central gear of the planetary gear inside the shaft, and the planetary gear satellite shaft is fixed in its protrusions.

The proposed drive gripper machine reloading is illustrated by the drawings shown in figures 1-3.

Figure 1 shows a General view of the drive capture;

figure 2 shows a longitudinal section of the drive;

figure 3 shows a cross section of a planetary gear.

The gripper drive of the reloading machine comprises a fuel assembly capture drum 1, a cluster capture drum 2 onto which ropes 3 and 4 are wound, controlling the grippers. The drums 1 and 2 are mounted on the shaft 5, and the drum 1 is rigidly, and the drum 2 is movable. The shaft 5 is mounted movably in the bearings 6 and 7. In the protrusions 8 of the shaft 5, the satellite 9 is movably mounted, which is meshed with the ring gear 10 of the drum 2 and the central gear 11, thereby forming a planetary gear 13. The central gear 11 is rigidly connected to the shaft 12, movably mounted inside the shaft 5.

The operation of the gripper drive is as follows.

1st mode - work with cluster capture, i.e. moving cluster capture relative to the fixed FA capture: the cluster capture drive is working. The shaft 12 rotates, the shaft 5 is inhibited. Drum 1 is stationary. The rotation of the shaft 12 through the Central gear 11 is transmitted to the satellite 9. The rotation of the satellite is transmitted to the ring gear 10, driving the drum 2 and winding on it or reeling from it a rope 4 connected with the capture of the cluster.

2nd mode - work with the capture of fuel assemblies, i.e. synchronous movement of fuel assembly capture and cluster capture: the drive for lifting the fuel assembly capture works. The shaft 5 rotates, the shaft 12 is inhibited. The shaft 5 transmits the rotation of the drum 1 and the satellite 9, which, running around the stationary gear 11 and interacting with the ring gear 10, transmits the rotation to the drum 2. Ropes 3 and 4 are wound on or reeled up on the drums 1 and 2, providing for the movement of the fuel assemblies associated with them and cluster capture, respectively.

The planetary gear 13 acts as a synchronizing mechanism, eliminating the slipping of the cluster capture drum relative to the fuel assembly drive drum. In the design of the drive, the diameters of the drums are selected on the basis of kinematic calculations, based on the equality of the linear speeds of the ropes 3 and 4.

The use of the present invention improves the reliability of the drive, simplify its design and reduce metal consumption.

Sources of information

1. Handbook of cranes / Under the general editorship of prof. M. Gokhberg, 1988, p. 393, fig. VI 2.20 “Scheme of a clamshell twin-engine winch with planetary gear”.

2. Japan Patent No. 52-22076, cl. G 21 C 19/10, publ. 1973 (prototype).

Claims (1)

A reloading machine gripper drive comprising a fuel assembly capture drum, a cluster capture drum and a planetary gear, characterized in that the fuel assembly capture drum and a cluster capture drum are located on the same shaft, a planetary gear including a central gear and a satellite with the shaft is located in the cavity of the cluster capture drum moreover, the central gear of the planetary gear is mounted inside the shaft, and the planet shaft of the planetary gear is fixed in its protrusions.

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