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CN-224230675-U - Sintering furnace

CN224230675UCN 224230675 UCN224230675 UCN 224230675UCN-224230675-U

Abstract

A sintering furnace comprises a furnace body, a furnace lining, heating resistance wires, a furnace inner cylinder, a central heating component and an exhaust pipe, wherein the furnace lining is arranged on the inner surface of the furnace body, the heating resistance wires are uniformly arranged on the surface of the furnace lining, the furnace inner cylinder is positioned inside the furnace body and surrounded by the heating resistance wires, a communication cavity is formed between the upper adjacent furnace inner cylinder and the lower adjacent furnace inner cylinder, the central heating component is positioned at the central position of the furnace inner cylinder, and the exhaust pipe is fixedly arranged on the upper surface of the furnace body and extends into the furnace body. The central heating component comprises a central heating column, and the bottom of the central heating column is fixedly arranged on the surface of the bottom of the furnace inner cylinder. Through the dual heating mode of the central heating component and the furnace lining surface heating resistance wire, the internal and external synchronous heating is realized, the temperature difference is reduced, the method is particularly suitable for materials with poor heat conductivity, and the production efficiency is improved. The heating resistance wires on the surface of the furnace lining provide peripheral radiant heat, the central heating column generates a central heat source through resistance heating, so that inner and outer cooperative heating is formed, and the sintering efficiency is improved.

Inventors

  • LI HAO
  • HE ZHAOBIN
  • DOU QIANG

Assignees

  • 山东华大金科新材料有限公司

Dates

Publication Date
20260512
Application Date
20250430

Claims (10)

  1. 1. A sintering furnace, which is characterized in that a furnace body (1); the furnace lining (3) is arranged on the inner surface of the furnace body (1); The heating resistance wires (4) are uniformly arranged on the surface of the furnace lining (3); The furnace inner cylinder (5), the furnace inner cylinder (5) is positioned in the furnace body (1) and surrounded by the heating resistance wire (4), and a communicating cavity (17) is formed between the upper and lower adjacent furnace inner cylinders (5); the central heating component (8), the central heating component (8) is located in the central position of the furnace inner barrel (5), a sleeve is sleeved on the outer surface of the central heating column (11), and a gas accelerating channel (12) is arranged between the sleeve and the central heating column (11).
  2. 2. A sintering furnace according to claim 1, characterized in that the central heating element (8) comprises a central heating column (11), the bottom of the central heating column (11) being fixedly arranged with the bottom surface of the furnace inner cylinder (5).
  3. 3. The sintering furnace of claim 2, wherein spiral guide vanes are uniformly arranged on the inner surface of the gas accelerating channel (12), an umbrella-shaped diffusion cover (10) is arranged at the top end of the central heating column (11), air inlet holes (14) are formed in the bottom surface of the sleeve, the air inlet holes (14) are uniformly arranged along the circumferential direction of the sleeve, and the air inlet holes (14) are obliquely arranged.
  4. 4. A sintering furnace according to claim 3, wherein protrusions (9) are arranged on the surface of the furnace lining (3) and at positions corresponding to the positions of the furnace inner cylinder (5), protrusions (9) are arranged on the surface of one side of the furnace inner cylinder (5) close to the furnace lining (3), adjacent protrusions (9) are matched to form a venturi tube structure, and the distance between the adjacent protrusions (9) is gradually reduced from top to bottom.
  5. 5. A sintering furnace according to claim 1, characterized in that a vacuum heat insulation layer (16) is arranged between the furnace body (1) and the furnace lining (3), and a radiation shielding foil is covered on one side of the vacuum heat insulation layer (16) close to the furnace body (1).
  6. 6. A sintering furnace according to claim 5, characterized in that a water channel layer is arranged on one side of the furnace body (1) away from the furnace lining (3), and a circulating water pipe (2) is arranged in the water channel layer.
  7. 7. The sintering furnace of claim 6, wherein the circulating water pipe (2) is arranged in an S shape from top to bottom, a water inlet port (7) is arranged on the surface of the furnace body (1), and a water outlet port (15) is arranged on the lower surface of the bottom of the furnace body (1).
  8. 8. The sintering furnace of claim 7, wherein a steady flow cavity is arranged at the joint of the water outlet port (15) and the circulating water pipe (2), the diameter of the steady flow cavity is 3 times that of the circulating water pipe (2), and a guide vane is fixedly arranged in the steady flow cavity.
  9. 9. A sintering furnace according to claim 1, characterized in that the surface of the furnace body (1) is provided with a temperature measuring sleeve.
  10. 10. A sintering furnace according to claim 1, further comprising an exhaust pipe (6), wherein the exhaust pipe (6) is fixedly installed on the upper surface of the furnace body (1) and extends into the furnace body (1).

Description

Sintering furnace Technical Field The utility model relates to the technical field of stoves, in particular to a sintering stove. Background Sintering refers to the transformation of a powdery material into a dense body, and is a traditional technological process. This process has long been used to produce ceramics, powder metallurgy, refractory materials, ultra-high temperature materials, and the like. In general, after the powder is molded, a compact obtained by sintering is a polycrystalline material whose microstructure is composed of crystals, glass bodies and pores. The sintering process directly affects the grain size, pore size, and grain boundary shape and distribution in the microstructure, thereby affecting the properties of the material. The sintering furnace is special equipment for enabling powder pressed compact to obtain required physical and mechanical properties and microstructure through sintering, heating rods are arranged around products in most of the existing sintering furnaces, temperature difference is easily generated inside and outside the sintering furnaces in the heating process, the products are heated unevenly to influence sintering results, for certain products with poor heat conductivity, heating time is longer, the temperature difference generated inside and outside the sintering furnaces is easier to influence the sintering results of the products, and the overall production efficiency is influenced. According to the invention, the sintering furnace comprises a furnace body, wherein a furnace lining is arranged on the inner surface of the furnace body, a resistance wire is arranged on the furnace lining, a furnace inner cylinder is arranged in the furnace body and surrounded by the resistance wire, the furnace inner cylinder consists of a communicating pipe, an inner cylinder cover, a temperature measuring sleeve, an exhaust hole, an inner sleeve, an inner cylinder body and a heating element, the inner sleeve is arranged in the inner cylinder body, the heating element is arranged in the center of the inner sleeve, the communicating pipe is communicated between the inner cylinder body and the inner sleeve, the temperature measuring sleeve and the exhaust hole are welded on the inner cylinder cover of the inner cylinder body, and the heating column is arranged in the center of the furnace body, so that the inside and the outside of the furnace body are heated simultaneously, but the inner space of the furnace body is further compressed, the circulation speed of gas in the furnace is further reduced, and the problem of uneven heating still exists for products with poor heat conductivity. Disclosure of Invention In order to solve the problem that the product is heated unevenly when the conventional sintering furnace performs the sintering process, the utility model provides a sintering furnace for solving the problem. A sintering furnace, comprising a furnace body; the furnace lining is arranged on the inner surface of the furnace body; the heating resistance wires are uniformly arranged on the surface of the furnace lining; The furnace inner cylinder is positioned in the furnace body and surrounded by the heating resistance wire, and a communication cavity is formed between the upper adjacent furnace inner cylinder and the lower adjacent furnace inner cylinder; A central heating element located at a central position of the furnace inner barrel; and the exhaust pipe is fixedly arranged on the upper surface of the furnace body and extends into the furnace body. Further, the central heating component comprises a central heating column, and the bottom of the central heating column is fixedly arranged on the surface of the bottom of the inner furnace cylinder. Further, but because the bottom end part of the central heating column needs to be provided with a fixing device, a certain distance exists between the heating resistor inside the central heating column and the bottom end during heating, so that the temperature difference between the top end and the bottom end of the central heating column is caused, a temperature difference is formed between the bottom part and the top part in the furnace, and the furnace inner barrel at the bottom part is heated unevenly, thereby influencing the sintering of products. Furthermore, through the dual heating mode of the central heating component and the furnace lining surface heating resistance wire, the internal and external synchronous heating is realized, the temperature difference is reduced, the method is particularly suitable for materials with poor thermal conductivity, and the production efficiency is improved. Further, the heating resistance wires on the surface of the furnace lining provide peripheral radiant heat, and the central heating column generates a central heat source through resistance heating, so that internal and external cooperative heating is formed; Further, the gas enters a gas accelerating channel from an air inlet