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Preparation method of rod porcelain insulator

A pillar porcelain insulator and rod-shaped technology, which is applied in the field of preparation of rod-shaped pillar porcelain insulators, can solve the problems of difficult internal stress, high production cost, complicated operation, etc., and achieves the effects of good effect, low cost and simple operation.

Active Publication Date: 2017-05-17
SINOMA JIANGXI ELECTRICAL PORCELAIN ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If there is stress inside the fired porcelain body, it is easy to burst during cutting and temperature cycle tests. For super-large rod-shaped pillar porcelain insulators with a rod diameter of more than 300mm, the normal firing process is very difficult. It is difficult to eliminate its internal stress. In the prior art, some ceramic parts are fired and placed at room temperature for a long time to eliminate stress, and some are tempered after firing, that is, secondary firing to 850-1000°C. Eliminate stress, the above method is complex in operation, low in efficiency, poor in effect, and high in production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The raw materials are weighed according to the following weight percentages: 45-53% of calcined bauxite; 8-15% of Jingyang clay; 5-12% of Zhangcun clay; 7-13% of calcined Datong clay; 16-25% of Zuoyun clay. The sum of the weight percentages of the above-mentioned components is 100%; and then prepare rod-shaped pillar porcelain insulators according to the following procedures: raw material ball milling, sieving and iron removal, spray drying and granulation, isostatic pressing, trimming, glazing, firing The firing process includes a low-temperature stage, an oxidation decomposition stage, a high-temperature stage, and a cooling stage. The cooling stage of the firing process includes the following process: firstly, the temperature in the kiln is reduced from the firing rate to 200-300°C / h. The forming temperature is 1230-1330°C and lowered to 980-1020°C; then the temperature in the kiln is reduced from 980-1020°C to 870-880°C at a cooling rate of 40-60°C / h; ~2 hours; then...

Embodiment 2

[0015] The raw materials were weighed according to the following weight percentages: 50% calcined bauxite; 10% Jingyang clay; 8% Zhangcun clay; 10% calcined Datong clay; 22% Zuoyun clay. Then prepare rod-shaped pillar porcelain insulators according to the following procedures: raw material ball milling, sieving and iron removal, spray drying and granulation, isostatic pressing, trimming, glazing, and firing; the firing process includes a low-temperature stage and an oxidation decomposition stage . High temperature stage and cooling stage. The cooling stage of the firing process includes the following process: first, the temperature in the kiln is reduced from the firing temperature of 1230 to 1330°C to 980 to 1020°C at a cooling rate of 200 to 300°C / h; Then lower the temperature in the kiln from 980-1020°C to 870-880°C at a cooling rate of 40-60°C / h; keep the temperature at 870-880°C for 1-2 hours; then use a cooling rate of 20-30°C / h The cooling speed reduces the temperature ...

Embodiment 3

[0017] The raw materials were weighed according to the following weight percentages: calcined bauxite 52%; Jingyang clay 8%; Zhangcun clay 10%; calcined Datong clay 7%; Zuoyun clay 23%. Then prepare rod-shaped pillar porcelain insulators according to the following procedures: raw material ball milling, sieving and iron removal, spray drying and granulation, isostatic pressing, trimming, glazing, and firing; the firing process includes a low-temperature stage and an oxidation decomposition stage , high temperature stage, cooling stage, the cooling stage of the firing process includes the following process: firstly, the temperature in the kiln is reduced from the firing temperature of 1260°C to 1000°C at a cooling rate of 300°C / h; The cooling rate reduces the temperature in the kiln from 1000°C to 880°C, and keeps at 880°C for 1 hour; the temperature in the kiln drops from 880°C to 810°C at a cooling rate of 30°C / h, and keeps at 810°C for 2.5 hours; The temperature in the kiln i...

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Abstract

The invention discloses a preparation method of rod porcelain insulator. The preparation method comprises the following working procedures: raw material ball milling, sieving and deironing, spray drying and pelleting, isostatic forming, fettling, glazing and firing, wherein the working procedure of firing comprises a low temperature stage, an oxygenolysis stage, a high temperature stage and a cooling stage, and the cooling stage of the working procedure of firing comprises a specific cooling process. The preparation method disclosed by the invention is simple in operation, and interior stress of the rod porcelain insulator can be effectively removed.

Description

technical field [0001] The invention relates to a preparation method of a rod-shaped pillar porcelain insulator. Background technique [0002] Porcelain insulators are key components used in power systems for support and insulation. Large-sized rod-shaped pillar porcelain insulators are mainly fired by aluminum porcelain, dry isostatic pressing and "sit first and then hang" firing process. During the firing process, the blank needs to shrink and lift. Rod diameter products are heavy, and the rod diameter of the upper main body and the hanging head are easily strained, resulting in defects such as cracks and U-turns. The root cause of this defect is that the high-temperature load capacity of the porcelain material is insufficient. However, in order to meet the porosity requirements of the aluminum porcelain formula for super-sized rod-shaped pillar porcelain insulators currently used, the amount of main flux feldspar is increased, and the high-temperature load capacity of th...

Claims

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Application Information

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IPC IPC(8): C04B33/13C04B33/26C04B33/34H01B19/00
CPCC04B33/13C04B33/26C04B33/34C04B2235/3217C04B2235/6562C04B2235/661H01B19/00
Inventor 桑建华张旭昌韩春俭韩红英陈文辉毕见学
Owner SINOMA JIANGXI ELECTRICAL PORCELAIN ELECTRIC CO LTD
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