A powder-adding dimple-making device for preforming the lower half mold of the fuel-free area of ​​a spherical fuel element

Abstract

According to the present invention, a powder-feeding and nest-making device for preforming the lower half-mold of a spherical fuel element without a fuel zone, the powder hopper is fixedly arranged on the top of the machine frame, and the top of the material guide device is closely connected with the bottom feeding port of the powder hopper. The frame below the material guide device is provided with a powder adding station and a nest making station, and the forming lower mold is placed on the powder adding station; the powder adding station of the mold upper cover assembly is set above the forming lower mold, and The bottom of the material device is connected with the forming lower mold through the powder adding position, and the bottom of the nest making position of the mold loam cake assembly is fixedly connected with a spherical steamed bun. The upper material guide pipe, straight material pipe and lower material guide pipe of the material guide device rotate through the screen to realize quantitative feeding, and the feeding is even and loose. During the feeding process, the mold upper cover assembly is always above the forming lower mold , to prevent the overflow of matrix graphite powder and protect the environment of the production workshop. After the powder addition is completed, the nest is made at the nest making station, and multiple stations complete the powder addition and nest making of multiple forming lower molds at the same time, which greatly improves the production efficiency.

Description

technical field [0001] The invention relates to the technical field of nuclear technology devices, in particular to a powder-feeding dimple-making device for preforming the lower half mold of a fuel-free region of a spherical fuel element. Background technique [0002] The fuel used in the pebble bed high-temperature gas-cooled reactor is a spherical fuel element with a diameter of about 60mm and a certain number of coated particles evenly distributed inside. The area containing fuel in the center of the sphere is called the fuel area, and the peripheral area of ​​the fuel area is called the fuel-free area. . The forming process of the fuel area and the fuel-free area includes a pre-forming process and a final pressure forming process. The preforming of the fuel area is under the pressure of 0.3-4MPa, and the material after uniformly mixing the quantitative matrix graphite powder and the quantitative dressing particles is pressed into the soft rubber film; the preforming of...

AI Technical Summary

Problems solved by technology

At present, the bottom half of the mold is used to add powder to make dimples, which is an open type with screw feeding. The dice is completed at the same time as powder is added. There are long periods of powder adding and dimple making, dust overflow and production capacity cannot meet the needs of large-scale production of spherical fuel elements.

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