Novel hoisting tool

Abstract

The invention discloses a hoisting tool, in particular to a hoisting tool for a mould and a product in a hot-pressing sintering furnace and has the specific scheme as follows: a circular bracket provided with a nut 3 and a positioning sleeve 5 in the middle and three diagonal bars 6, three flat bars 10, three jackets 4 and hoisting hooks on the periphery is welded according to the size of a hearth, wherein the hoisting hooks are uniformly distributed at 120 degrees; after a T-shaped lead screw 2 which is in threaded fit with the nut 3 and the positioning sleeve 5 is screwed into the nut 3 and the positioning sleeve 5, the top end of the lead screw 2 is connected with a pressure plate 9; a hoisting hook upright post 1 which is provided with a folding hook 12 and a handle 11, is also provided with circular threads in the middle and has two square sides is cut off from the threaded and square joint; one end of each hoisting hook penetrates from a lower port of each jacket 4; and after a positioning nut 7 with a flat washer 8 is screwed, the upright post is welded according to the original appearance. The novel hoisting tool has the advantages of safety and firmness in use, no damage to the mould, a tray and a graphite pipe and long service life; the maximum safety size of the external diameter of the graphite mould can be ensured, and 20 percent of effective use space of the graphite mould can be increased.

Description

Technical field: [0001] The invention relates to the field of hoisting tools, in particular to a new hoisting tool for graphite molds and products in a vacuum hot-pressing sintering furnace. Background technique: [0002] With the rapid development and advancement of science and technology, inorganic non-metallic special ceramic material products are more and more widely used due to their unique high strength, high hardness, high wear resistance, good thermal conductivity and low density. In the fields of national defense, military industry, petrochemical, energy, scientific research, navigation, aerospace and nuclear industry, most of the carbide special ceramic products are made by high temperature and high pressure sintering using graphite molds in a vacuum sintering furnace. Before and after sintering, the product and the graphite mold need to be loaded and taken back and forth from the furnace. Most of the current sintering furnaces use the upper discharge method. The upper ...

AI Technical Summary

Problems solved by technology

Before and after sintering, it is necessary to load and take out the product and the graphite mold back and forth from the furnace. Most of the current sintering furnaces use the upper and lower discharge method. The upper cover of the furnace can be hoisted by a crane, and the furnace is made of graphite tubes ( Also known as heating element) and peripheral multi-layer carbon felt, according to the design capacity of the furnace, the inner diameter and depth of the graphite tube range from ∮200×300 to ∮900×1350; the hardness and strength of ordinary graphite are very low, and the The hacksaw blade can cut graphite like cutting wood, and it is easy to be damaged by external force or heavy object collision

The initial tool for loading and unloading the graphite mold into the graphite tube of the furnace is a pincer-shaped clamp with two tile-shaped clamp heads. The disadvantages: (1) The clamp occupies a large space, which limits the size selection of the graphite mold and reduces the product quality. Sintering quantity; (2) Since the graphite molds are mostly cylindrical and the outer surface is too slippery, they will slip if they are not careful. The light ones will cause damage to the product and the mold, and the severe ones will smash the furnace graphite tube

In view of the above shortcomings, the screw spreader was used later, that is, a threaded hole of M20-24 was processed with a tap in the center of the graphite tray holding the graphite mold, and a through hole larger than the diameter of the threaded hole was opened in the center of the graphite mold. Ordinary 45# steel is made of a "T"-shaped long screw, and the front end is a bolt connected to the threaded hole in the center of the tray. It is used to complete the loading and unloading of molds and products. The disadvantages: (1) Due to the softness of graphite, The internal thread in the center of the tray wears quickly. Generally, it needs to be replaced once after about 20 times of use, and there is a potential hidden danger of falling off during use; (2) Since a through hole is opened in the center of the graphite mold, it is bound to reduce the graphite mold assembly. There is a large number of products, and the existence of through holes will greatly reduce the service life of graphite molds under high temperature and high pressure

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