Coal mine underground ceramic lining explosion-proof switch shell and manufacturing process

Abstract

The invention relates to the field of explosion-proof switch shells and manufacturing processes, in particular to a coal mine underground ceramic lining explosion-proof switch shell and a manufacturing process, the coal mine underground ceramic lining explosion-proof switch shell comprises an outer layer and a lining, the lining comprises the following materials: clay, feldspar, quartz, calcium oxide powder and fiber; the raw materials are prepared according to the following parts by weight. The ceramic tile is prepared from, by weight, 30-50 parts of clay, 20-30 parts of feldspar, 20-30 parts of quartz, 5-8 parts of calcium oxide powder and 5-8 parts of fibers. The shell is of a double-layer structure, the insulating ceramic lining and the steel shell are combined to form a good power supply switch explosion-proof shell, the lining is formed by firing clay, feldspar, quartz, calcium oxide powder and fibers, and the fibers are composed of 95% of alumina refractory fibers and 5% of polycrystalline fibers, so that the manufactured ceramic lining is high in fire-resistant temperature and good in heat insulation performance. The explosion-proof insulating ceramic overcomes the defect of high brittleness of ceramic, has excellent explosion-proof performance and insulating performance, and has extremely high stability when being used in flammable and explosive coal mines.

Description

Technical Field

[0001] The invention relates to the field of explosion-proof switch housing and manufacturing technology, and in particular to a ceramic-lined explosion-proof switch housing and manufacturing technology for underground coal mines. Background Art

[0002] In underground coal mines, the safety of the power supply and distribution system is of vital importance. Therefore, explosion-proof switches are usually used to ensure the safe operation of equipment in flammable and explosive environments. These explosion-proof switches must undergo strict safety certification and are usually marked with the "MA" logo, indicating that they meet coal mine safety and explosion-proof standards. However, the existing explosion-proof switches in coal mines basically use steel casings. The advantages of steel casings are high pressure and impact resistance, which can protect internal electrical components from mechanical damage in the harsh environment of coal mines. At the same time, the airtightness and strength of steel can effectively prevent the intrusion of external coal dust and moisture. However, it has some disadvantages when used in coal mines. The insulation performance of steel is low, and it is easy to cause leakage during use. In addition, when the equipment fails, the steel casing may cause current leakage, which is extremely dangerous in flammable and explosive coal mines.

[0003] Therefore, in order to solve the problem that the above steel casing has poor insulation and strong conductivity when used in coal mines, a ceramic lined explosion-proof switch casing and manufacturing process for underground coal mines can be designed. Summary of the invention

[0004] In order to overcome the problem of poor insulation and strong conductivity of steel casing when used underground in coal mines.

[0005] The technical solution of the present invention is: a coal mine underground ceramic lined explosion-proof switch housing and manufacturing process, including the following outer layer and inner lining: the inner lining includes the following materials: clay, feldspar, quartz, calcium oxide powder, fiber; calculated by weight, the proportion is as follows: 30 to 50 parts of clay, 20 to 30 parts of feldspar, 20 to 30 parts of quartz, 5 to 8 parts of calcium oxide powder, and 5 to 8 parts of fiber.

[0006] Preferably, the outer layer is made of steel.

[0007] Preferably, the fiber ratio is 95% alumina refractory fiber and 5% polycrystalline fiber.

[0008] A manufacturing process of a ceramic lined explosion-proof switch housing for underground coal mines, comprising the above-mentioned ceramic lined explosion-proof switch housing for underground coal mines, and the steps are as follows: Step 1: Weigh the clay, feldspar, quartz, calcium oxide powder and fiber according to the lining ratio, then crush the clay, feldspar and quartz and pass through a 100-mesh sieve; Step 2: Put clay, feldspar and quartz into the machine for the first stage of mixing, and then put calcium oxide powder and fiber into the machine for the second stage of mixing; Step 3: Put the mixed ceramic raw materials into the explosion-proof switch lining mold and press it into shape by pressure; Step 4: Place the formed ceramic lining in a cool place for natural drying; Step 5: The ceramic lining is sent into a kiln at 800-1200°C for firing, and then taken out and allowed to cool naturally; Step 6: Use a high temperature and corrosion resistant adhesive to bond the ceramic lining and the steel outer layer together.

[0009] Preferably, the machine for mixing the materials in step 2 is a ball mill; the mixing time of the materials in the first stage in step 2 is 10 to 20 minutes; and the mixing time of the materials in the second stage is 20 to 30 minutes.

[0010] Preferably, the high temperature resistant and corrosion resistant adhesive used in step six can be one of silicate adhesive, fluoride adhesive and aluminum silicate adhesive.

[0011] Beneficial effects of the present invention: Compared with traditional steel shells, the shell of the present invention adopts a double-layer structure. The exterior still uses a steel shell with high pressure resistance and impact resistance, but an inner lining is added to the inside of the shell to make up for the shortcomings of poor insulation and strong conductivity of the steel shell. The insulating ceramic lining is combined with the steel shell to form a better explosion-proof shell for the power switch. The lining is made of clay, feldspar, quartz, calcium oxide powder, and fiber. The fiber is composed of 95% alumina refractory fiber and 5% polycrystalline fiber, so that the produced ceramic lining has a high refractory temperature, overcomes the disadvantage of high ceramic brittleness, and has excellent explosion-proof and insulation properties. The melting point can reach up to 2570 degrees Celsius, and it has extremely strong stability when used in flammable and explosive coal mines. DETAILED DESCRIPTION

[0012] The present invention will be further described below in conjunction with the embodiments.

[0013] Example 1

[0014] The present invention provides an embodiment: a ceramic lined explosion-proof switch housing and a manufacturing process for an underground coal mine, comprising the following outer layer and inner lining: the inner lining comprises the following materials: clay, feldspar, quartz, calcium oxide powder, and fiber; the proportions are as follows by weight: 40 parts of clay, 20 parts of feldspar, 20 parts of quartz, 5 parts of calcium oxide powder, and 6 parts of fiber.

[0015] Preferably, the outer layer is made of steel.

[0016] Preferably, the fiber ratio is 95% alumina refractory fiber and 5% polycrystalline fiber.

[0017] A manufacturing process of a ceramic lined explosion-proof switch housing for underground coal mines, comprising the above-mentioned ceramic lined explosion-proof switch housing for underground coal mines, and the steps are as follows: Step 1: Weigh the clay, feldspar, quartz, calcium oxide powder and fiber according to the lining ratio, then crush the clay, feldspar and quartz and pass through a 100-mesh sieve; Step 2: Put clay, feldspar and quartz into the machine for the first stage of mixing, and then put calcium oxide powder and fiber into the machine for the second stage of mixing; Step 3: Put the mixed ceramic raw materials into the explosion-proof switch lining mold and press it into shape by pressure; Step 4: Place the formed ceramic lining in a cool place for natural drying; Step 5: The ceramic lining is sent into a kiln at 800-1200°C for firing, and then taken out and allowed to cool naturally; Step 6: Use a high temperature and corrosion resistant adhesive to bond the ceramic lining and the steel outer layer together.

[0018] Preferably, the machine for mixing the materials in step 2 is a ball mill; the mixing time of the materials in the first stage in step 2 is 15 minutes; and the mixing time of the materials in the second stage is 15 minutes.

[0019] Preferably, the high temperature resistant and corrosion resistant adhesive used in step six can be one of silicate adhesive, fluoride adhesive and aluminum silicate adhesive.

[0020] Example 2

[0021] The present invention provides an embodiment: a ceramic lined explosion-proof switch housing and a manufacturing process for an underground coal mine, comprising the following outer layer and an inner lining: the inner lining comprises the following materials: clay, feldspar, quartz, calcium oxide powder, and fiber; the proportions are as follows by weight: 30 to 50 parts of clay, 20 to 30 parts of feldspar, 20 to 30 parts of quartz, 5 to 8 parts of calcium oxide powder, and 5 to 8 parts of fiber.

[0022] Preferably, the outer layer is made of steel.

[0023] Preferably, the fiber ratio is 95% alumina refractory fiber and 5% polycrystalline fiber.

[0024] A manufacturing process of a ceramic lined explosion-proof switch housing for underground coal mines, comprising the above-mentioned ceramic lined explosion-proof switch housing for underground coal mines, and the steps are as follows: Step 1: Weigh the clay, feldspar, quartz, calcium oxide powder and fiber according to the lining ratio, then crush the clay, feldspar and quartz and pass through a 100-mesh sieve; Step 2: Put clay, feldspar and quartz into the machine for the first stage of mixing, and then put calcium oxide powder and fiber into the machine for the second stage of mixing; Step 3: Put the mixed ceramic raw materials into the explosion-proof switch lining mold and press it into shape by pressure; Step 4: Place the formed ceramic lining in a cool place for natural drying; Step 5: The ceramic lining is sent into a kiln at 800-1200°C for firing, and then taken out and allowed to cool naturally; Step 6: Use a high temperature and corrosion resistant adhesive to bond the ceramic lining and the steel outer layer together.

[0025] Preferably, the machine for mixing the materials in step 2 is a ball mill; the mixing time of the materials in the first stage in step 2 is 10 to 20 minutes; and the mixing time of the materials in the second stage is 20 to 30 minutes.

[0026] Preferably, the high temperature resistant and corrosion resistant adhesive used in step six can be one of silicate adhesive, fluoride adhesive and aluminum silicate adhesive.

[0027] Example

[0028] The performance test experiment was conducted using the ceramic lined explosion-proof switch housing for underground coal mines of the present invention. The test samples were the explosion-proof switches made in Example 1 and Example 2 of the present invention, and the control group was a conventional steel housing. The test results are as follows: shell hardness Dielectric constant Melting point Chemical stability Thermal conductivity Oxidation Embodiment 1 1500HV 3300 2000℃ Excellent Insulation Excellent Embodiment 2 1400HV 3500 2100℃ Excellent Insulation Excellent Control group 700HV 2.3 1600℃ generally Thermal conductivity generally Table 1 It can be seen from Table 1 that the ceramic lined explosion-proof switch housing of the present invention used in coal mines has excellent fire resistance, can withstand extremely high temperatures, overcomes the disadvantage of high brittleness of ceramics, and exhibits excellent explosion-proof and insulation properties. When used in flammable and explosive coal mines, the housing exhibits extremely high stability, ensuring safe and reliable operation.

Claims

1. A ceramic lined explosion-proof switch housing and manufacturing process for underground coal mines, characterized in that: It includes the following outer layer and inner lining: the inner lining includes the following materials: clay, feldspar, quartz, calcium oxide powder, fiber; the proportions by weight are as follows: 30 to 50 parts of clay, 20 to 30 parts of feldspar, 20 to 30 parts of quartz, 5 to 8 parts of calcium oxide powder, and 5 to 8 parts of fiber.

2. The ceramic lined explosion-proof switch housing for underground coal mines according to claim 1 is characterized in that: The outer layer is made of steel.

3. The ceramic lined explosion-proof switch housing for underground coal mines according to claim 1 is characterized in that: The fiber ratio is 95% alumina refractory fiber and 5% polycrystalline fiber.

4. A manufacturing process for a ceramic lined explosion-proof switch housing in a coal mine, characterized in that The invention comprises a coal mine underground ceramic lined explosion-proof switch housing according to claims 1-3, and the steps are as follows: Step 1: Weigh the clay, feldspar, quartz, calcium oxide powder and fiber according to the lining ratio, then crush the clay, feldspar and quartz and pass through a 100-mesh sieve; Step 2: Put clay, feldspar and quartz into the machine for the first stage of mixing, and then put calcium oxide powder and fiber into the machine for the second stage of mixing; Step 3: Put the mixed ceramic raw materials into the explosion-proof switch lining mold and press it into shape by pressure; Step 4: Place the formed ceramic lining in a cool place for natural drying; Step 5: The ceramic lining is sent into a kiln at 800-1200°C for firing, and then taken out and allowed to cool naturally; Step 6: Use a high temperature and corrosion resistant adhesive to bond the ceramic lining and the steel outer layer together.

5. The manufacturing process of the ceramic lined explosion-proof switch housing for underground coal mines according to claim 4 is characterized in that: The material mixing machine in step 2 is a ball mill; the first stage mixing time of the material in step 2 is 10 to 20 minutes; The second stage mixing time is 20 to 30 minutes.

6. The manufacturing process of the ceramic lined explosion-proof switch housing for underground coal mines according to claim 4 is characterized by: The high temperature resistant and corrosion resistant adhesive used in step six can be one of silicate adhesive, fluoride adhesive and aluminum silicate adhesive.