Explosion-proof conductive plastic, explosion-proof conductive shell and explosion-proof floating ball device

Abstract

The invention discloses anti-explosion conductive plastic, an anti-explosion conductive shell and an anti-explosion floating ball device. The explosion-proof conductive plastic is prepared from the following raw materials in parts by weight: 25-30 parts of polyethylene, 10-15 parts of chlorinated butadiene, 8-10 parts of epoxy resin, 6-8 parts of glyceryl tristearate, 10-15 parts of carbon nanotubes, 5-10 parts of metal fibers, 8-10 parts of metal hydroxides, 2-3 parts of barium stearate, 1-2 parts of talcum powder, 1-2 parts of zinc oxide and 1-2 parts of silicon carbide. The anti-explosion conductive shell is made of anti-explosion conductive plastic; the anti-explosion floating ball device comprises an anti-explosion conductive shell and a cable, and a ground wire of the cable is connected with the anti-explosion conductive shell. The anti-explosion conductive shell is made of high-conductivity anti-explosion conductive plastic, and the grounding design is combined, so that the liquid level control safety in special operation scenes such as mines and gas operation is remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of float liquid level switches, and in particular to an explosion-proof conductive plastic, an explosion-proof conductive shell and an explosion-proof float device. Background Art

[0002] A float level switch is a liquid level detection tool with a simple structure, easy use, safety and reliability. For example, the float level switch disclosed in patent publication number CN222507450U has a core working principle based on Archimedes' law of buoyancy. The float triggers the internal microswitch or magnetic sensing device by rising and falling with the liquid level, thereby realizing the start and stop control of electrical equipment such as water pump motors and solenoid valves, and achieving automated management of the high and low liquid levels in containers.

[0003] However, existing float level switches have exposed many limitations in special operating environments. From a material perspective, their casings are mostly made of non-conductive PP (polypropylene). Although this material has good chemical stability and cost advantages, it cannot effectively dissipate static electricity in charged environments. When charge accumulates on the surface of the equipment due to friction, electrostatic induction, and other reasons, after reaching a certain energy threshold, it is very easy to cause electrostatic discharge. The sparks generated are sufficient to ignite combustible gases or dust in flammable and explosive environments, causing explosion accidents. Especially in scenarios with extremely high explosion-proof performance requirements, such as mining and gas operations, existing float level switches cannot meet strict safety standards. Not only can they not provide reliable liquid level monitoring for equipment operation, they can also become a potential safety hazard, seriously restricting their application and expansion in special hazardous environments. Summary of the Invention

[0004] In order to overcome the problem in the prior art that float level switches cannot be applied to special operating scenarios such as mining and gas operations, the present invention provides an explosion-proof conductive plastic, an explosion-proof conductive housing and an explosion-proof float device.

[0005] The technical solution of the present invention is as follows: In a first aspect, the present invention provides an explosion-proof conductive plastic, which is prepared from the following raw materials in parts by weight: 25-30 parts of polyethylene, 10-15 parts of chlorinated butadiene, 8-10 parts of epoxy resin, 6-8 parts of glyceryl tristearate, 10-15 parts of carbon nanotubes, 5-10 parts of metal fiber, 8-10 parts of metal hydroxide, 2-3 parts of barium stearate, 1-2 parts of talc, 1-2 parts of zinc oxide, and 1-2 parts of silicon carbide.

[0006] As a preferred embodiment of the present invention, the explosion-proof conductive plastic is prepared from the following raw materials in parts by weight: 25 parts of polyethylene, 10 parts of chlorinated butadiene, 8 parts of epoxy resin, 6 parts of glyceryl tristearate, 10 parts of carbon nanotubes, 5 parts of metal fibers, 8 parts of metal hydroxide, 2 parts of barium stearate, 1 part of talc, 1 part of zinc oxide, and 1 part of silicon carbide.

[0007] As a preferred embodiment of the present invention, the explosion-proof conductive plastic is prepared from the following raw materials in parts by weight: 30 parts of polyethylene, 15 parts of chlorinated butadiene, 10 parts of epoxy resin, 8 parts of glyceryl tristearate, 15 parts of carbon nanotubes, 10 parts of metal fibers, 10 parts of metal hydroxide, 3 parts of barium stearate, 2 parts of talc, 2 parts of zinc oxide, and 2 parts of silicon carbide.

[0008] As a preferred embodiment of the present invention, the metal hydroxide is aluminum hydroxide.

[0009] As a preferred embodiment of the present invention, the metal hydroxide is magnesium hydroxide.

[0010] As a preferred embodiment of the present invention, the method for preparing the explosion-proof conductive plastic comprises: Step S1, taking, by weight, 25-30 parts of polyethylene, 10-15 parts of chlorinated butadiene, 8-10 parts of epoxy resin, 6-8 parts of glyceryl tristearate, 10-15 parts of carbon nanotubes, 5-10 parts of metal fiber, 8-10 parts of metal hydroxide, 2-3 parts of barium stearate, 1-2 parts of talc, 1-2 parts of zinc oxide, and 1-2 parts of silicon carbide; Step S2, melt-blending polyethylene, chlorinated butadiene, epoxy resin and glyceryl tristearate; Step S3, adding carbon nanotubes, metal fibers and barium stearate to the mixture obtained in step S2, and stirring to uniformly disperse; Step S4, adding magnesium hydroxide, talc, zinc oxide and silicon carbide to the mixture obtained in step S3 and kneading; Step S5: adding the mixture obtained in step S4 into a twin-screw extruder for granulation to prepare explosion-proof conductive plastic particles.

[0011] As a preferred embodiment of the present invention, in step S2, polyethylene, chlorinated butadiene, epoxy resin and glyceryl tristearate are added to an internal mixer and melt-blended at 150-180°C.

[0012] In a second aspect, the present invention provides an explosion-proof conductive housing, which is made of the explosion-proof conductive plastic described in any of the above solutions.

[0013] In the third aspect, the present invention provides an explosion-proof float device, comprising an explosion-proof conductive shell and a cable as described in the above scheme, wherein a switch box is provided inside the explosion-proof conductive shell, and a microswitch and a steel ball that can be close to or away from the microswitch are provided inside the switch box, and the cable includes a grounding wire, a common wire, a normally closed wire and a normally open wire, the grounding wire is connected to the explosion-proof conductive shell, and the common wire, the normally closed wire and the normally open wire are respectively connected to the common end, normally closed end and normally open end of the microswitch.

[0014] As a preferred solution of the present invention, a sealing sleeve is provided at the connection between the cable and the explosion-proof conductive housing.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. Through the synergistic effect of carbon nanotubes and metal fibers, the surface resistivity of explosion-proof conductive plastics reaches the standard for conductive plastics, which can effectively conduct away static charges. The addition of metal hydroxides gives the material good flame retardancy and smoke suppression properties, meeting the requirements for use in explosion-proof environments. The reasonable ratio of base resin and reinforcing fillers ensures that the material has high tensile strength and impact toughness, meeting the needs of use in industrial environments. 2. The explosion-proof conductive shell adopts high-conductivity explosion-proof conductive plastic, combined with the grounding design, to form a complete static elimination path, ensuring that the surface charge of the equipment is quickly discharged to the ground, avoiding static electricity accumulation and causing electric sparks, significantly improving the safety of liquid level control in special operation scenarios such as mining and gas operations, and has important industrial application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic structural diagram of the explosion-proof float device in Example 4 of the present invention.

[0018] In the figure, 1. Explosion-proof conductive housing; 2. Cable; 21. Ground wire; 22. Common wire; 23. Normally closed wire; 24. Normally open wire; 3. Switch box; 4. Micro switch; 5. Steel ball; 6. Sealing sleeve. DETAILED DESCRIPTION

[0019] To make the technical problems, technical solutions, and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. It should also be noted that the embodiments described below are intended only to illustrate the present invention and are not intended to limit the present invention.

[0020] It should be noted that the terms "install", "set", "connect", "fix" and the like should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrated; they can be mechanically connected or electrically connected; they can be directly connected or indirectly connected through an intermediate medium; they can be internal communication between two elements or an interaction relationship between two elements, unless otherwise clearly defined. The terms "include" and "have" and any variations thereof in the specification and claims of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices. Example 1

[0021] This embodiment provides an explosion-proof conductive plastic, which is prepared according to the following method: Step S1: Take 25 parts of polyethylene, 10 parts of chloroprene, 8 parts of epoxy resin, 6 parts of tristearate, 10 parts of carbon nanotubes, 5 parts of metal fibers, 8 parts of aluminum hydroxide, 2 parts of barium stearate, 1 part of talc, 1 part of zinc oxide, and 1 part of silicon carbide according to weight.

[0022] Polyethylene, chlorinated butadiene, epoxy resin, and tristearin serve as the matrix resins. Polyethylene provides basic toughness and processing fluidity and is the primary film-forming material. Chlorinated butadiene introduces chlorine to improve flame retardancy and enhance compatibility with polar fillers. Epoxy resin enhances the material's cohesion and bonding strength, improving the composite's interfacial bonding. Tristearin acts as an internal lubricant, reducing melt viscosity and improving processing performance. Carbon nanotubes and metal fibers serve as conductive fillers. Carbon nanotubes, with their high conductivity and strength, impart excellent conductivity to polypropylene at low addition levels. They form a three-dimensional network within the matrix, significantly enhancing conductivity. Metal fibers, with their high aspect ratio, form conductive pathways with the carbon nanotubes, strengthening these pathways and increasing material rigidity. Aluminum hydroxide, an explosion-proof additive, decomposes at a temperature of 200-300°C, suppressing combustion by absorbing heat and cooling. Decomposition releases water vapor, diluting oxygen concentration, and forms an aluminum oxide flame-retardant layer to block heat transfer. Barium stearate, talc, zinc oxide and silicon carbide are used as additives. Barium stearate has both lubricating and thermal stabilizing effects, which can promote the dispersion of carbon nanotubes in the matrix and improve the interfacial compatibility between polar fillers and non-polar matrices. Talc has a flaky structure, which can improve the rigidity and dimensional stability of the material and reduce the shrinkage of the material. Zinc oxide is used to catalyze the carbonization reaction to form an insulating layer, absorb smoke particles produced by combustion, reduce smoke density, and form a synergistic effect with aluminum hydroxide (the synergy coefficient reaches 1.3), thereby improving flame retardant efficiency. Silicon carbide improves the heat dissipation performance of the material through high thermal conductivity, and improves the material's wear resistance and arc resistance.

[0023] Step S2: Add polyethylene, chlorinated butadiene, epoxy resin, and glyceryl tristearate to an internal mixer and melt blend at 150°C for 15 minutes. The melt blending temperature is 150°C, which is below the curing temperature of the epoxy resin to prevent premature crosslinking and ensure full melting of the polyethylene (polyethylene has a melting point of approximately 130°C). The melt blending time is 15 minutes to ensure thorough mixing of the matrix resins and prevent decomposition of the chlorinated butadiene at high temperatures.

[0024] Step S3: Add the carbon nanotubes, metal fibers, and barium stearate to the mixture from step S2 and stir at 600 rpm for 45 minutes to evenly disperse the ingredients. This step utilizes shear force to break up the carbon nanotube aggregates, evenly distribute the metal fibers, and ensure a complete conductive network. The barium stearate fully coats the filler surface, reducing its surface energy.

[0025] Step S4: adding magnesium hydroxide, talc, zinc oxide, and silicon carbide to the mixture obtained in step S3 and kneading for 15 minutes. Aluminum hydroxide is added later with talc, zinc oxide, and silicon carbide to avoid dehydration caused by prolonged high-temperature kneading, thereby maintaining a crystal water content of approximately 34%.

[0026] Step S5: The mixture obtained in step S4 is added to a twin-screw extruder for granulation at an extrusion temperature of 170°C to produce explosion-proof conductive plastic granules. The extrusion temperature of 170°C is above the melting point of the matrix resin but below the decomposition temperature of aluminum hydroxide, ensuring sufficient plasticization of the material without destroying the flame retardant structure. The strong shearing action of the twin-screw extruder further refines the filler dispersion, forming a continuous and stable conductive flame-retardant phase structure.

[0027] Surface resistivity: 4.7× Ω; tensile strength: 28MPa; elongation at break: 220%; oxygen index: 32%; flame retardant grade: UL94V-0.

[0028] Performance testing: 1) Surface resistivity test Test method: Four-probe method (ASTM D257); Test equipment: Keithley 6517B megohmmeter; Test conditions: 23°C, 50% RH environment, then test after 24 hours; Test results: Surface resistivity is 4.7× Ω, reaching the conductive plastic standard ( - ), can be used for static dissipation and electromagnetic shielding.

[0029] 2) Tensile properties test Test method: dumbbell-type specimen (ISO 527-2); Testing equipment: Instron 5967 universal testing machine; Test conditions: tensile speed 50 mm / min; Test results: tensile strength is 28MPa, and elongation at break is 220%, meeting the requirements for industrial plastic parts (ASTM D638 standard).

[0030] 3) Flame retardant performance test Oxygen index test: Test method: GB / T 2406.2-2009; Testing equipment: HC-2 oxygen index meter; Test results: The oxygen index is 32%. Materials with an oxygen index above 27% are considered flame-retardant materials.

[0031] UL94 vertical burning test: Test method: UL94 standard; Sample size: 125mm×13mm×3mm; Test result: V-0 (after two 10-second combustions, the afterflame time is ≤ 10 seconds, and there is no dripping).

[0032] 4) Thermal stability test Test method: TGA thermogravimetric analysis; Test equipment: TA Instruments Q500; Test conditions: nitrogen atmosphere, heating rate of 10℃ / min; Test results: The initial decomposition temperature is 280°C (aluminum hydroxide dehydration), the maximum decomposition rate temperature is 420°C (matrix resin decomposition), the residual carbon rate at 700°C is 18%, and the material has good thermal stability at processing and use temperatures.

[0033] To sum up, the explosion-proof conductive plastic of this embodiment achieves the conductive plastic surface resistivity standard through the synergistic effect of carbon nanotubes and metal fibers, which can effectively conduct away static charges; the addition of aluminum hydroxide gives the material good flame retardancy and smoke suppression properties, meeting the requirements for use in explosion-proof environments; the reasonable ratio of matrix resin and reinforcing filler ensures that the material has high tensile strength and impact toughness, meeting the needs of use in industrial environments. Example 2

[0034] This embodiment provides an explosion-proof conductive plastic, which is prepared according to the following method: This embodiment provides an explosion-proof conductive plastic, which is prepared from the following raw materials in parts by weight: Step S1: Take 30 parts of polyethylene, 15 parts of chlorobutadiene, 10 parts of epoxy resin, 8 parts of tristearin, 15 parts of carbon nanotubes, 10 parts of metal fibers, 10 parts of magnesium hydroxide, 3 parts of barium stearate, 2 parts of talc, 2 parts of zinc oxide, and 2 parts of silicon carbide according to weight.

[0035] Polyethylene, chlorinated butadiene, epoxy resin, and tristearin serve as the matrix resins. Polyethylene provides basic toughness and processing fluidity and is the primary film-forming material. Chlorinated butadiene introduces chlorine to improve flame retardancy and enhance compatibility with polar fillers. Epoxy resin enhances the material's cohesion and adhesive strength, improving interfacial bonding between composites. Tristearin acts as an internal lubricant, reducing melt viscosity and improving processing performance. Carbon nanotubes and metal fibers serve as conductive fillers. Carbon nanotubes, with their high conductivity and strength, impart excellent conductivity to polypropylene at low addition levels. They form a three-dimensional network within the matrix, significantly enhancing conductivity. Metal fibers, with their high aspect ratio, form conductive pathways with the carbon nanotubes, strengthening these pathways and increasing material rigidity. Magnesium hydroxide, an explosion-proof additive, decomposes at 340°C and suppresses combustion by absorbing heat and cooling. Magnesium hydroxide has better thermal stability than aluminum hydroxide, making it suitable for materials with higher processing temperatures. Barium stearate, talc, zinc oxide and silicon carbide are used as additives. Barium stearate has both lubricating and thermal stabilizing effects, which can promote the dispersion of carbon nanotubes in the matrix and improve the interfacial compatibility between polar fillers and non-polar matrices. Talc has a flaky structure, which can improve the rigidity and dimensional stability of the material and reduce the shrinkage of the material. Zinc oxide is used to catalyze the carbonization reaction to form an insulating layer, absorb smoke particles produced by combustion, reduce smoke density, and form a synergistic effect with magnesium hydroxide to reduce the heat release rate (HRR). Silicon carbide improves the heat dissipation performance of the material through its high thermal conductivity, and improves the material's wear resistance and arc resistance.

[0036] Step S2: Add polyethylene, chlorinated butadiene, epoxy resin, and glyceryl tristearate to an internal mixer and melt blend at 180°C for 15 minutes. The melt blending temperature is 180°C, which is below the curing temperature of the epoxy resin to prevent premature crosslinking and ensure full melting of the polyethylene (polyethylene has a melting point of approximately 130°C). The melt blending time is 15 minutes to ensure thorough mixing of the matrix resins and prevent decomposition of the chlorinated butadiene at high temperatures.

[0037] Step S3: Add the carbon nanotubes, metal fibers, and barium stearate to the mixture obtained in step S2 and stir at 600 rpm for 60 minutes to evenly disperse the ingredients. This step utilizes shear force to break up the carbon nanotube aggregates, evenly distribute the metal fibers, and ensure a complete conductive network. The barium stearate fully coats the filler surface, reducing its surface energy.

[0038] Step S4: Add magnesium hydroxide, talc, zinc oxide, and silicon carbide to the mixture obtained in step S3 and mix for 20 minutes. Adding magnesium hydroxide later with talc, zinc oxide, and silicon carbide prevents dehydration caused by prolonged mixing at high temperatures, maintaining a crystalline water content of ≥31%. Mixing for 20 minutes ensures that the dispersed particle size of the inorganic filler is ≤3 μm, forming a "core-shell" structure (magnesium hydroxide coated with talc).

[0039] Step S5: The mixture obtained in step S4 is added to a twin-screw extruder for granulation at an extrusion temperature of 180°C to produce explosion-proof conductive plastic granules. The extrusion temperature of 180°C is above the melting point of the matrix resin but below the decomposition temperature of magnesium hydroxide, ensuring sufficient plasticization of the material without destroying the flame retardant structure. The strong shearing action of the twin-screw extruder further refines the dispersion of the filler, forming a continuous and stable conductive flame-retardant phase structure.

[0040] Performance testing: 1) Surface resistivity test Test method: Four-probe method (ASTM D257); Test equipment: Keithley 6517B megohmmeter; Test conditions: 23°C, 50% RH environment, then test after 24 hours; Test results: Surface resistivity is 4.1× Ω, reaching the conductive plastic standard ( - ), can be used for static dissipation and electromagnetic shielding.

[0041] 2) Tensile properties test Test method: dumbbell-type specimen (ISO 527-2); Testing equipment: Instron 5967 universal testing machine; Test conditions: tensile speed 50 mm / min; Test results: tensile strength is 35MPa, elongation at break is 180%, meeting the requirements for industrial plastic parts (ASTM D638 standard).

[0042] 3) Flame retardant performance test Oxygen index test: Test method: GB / T 2406.2-2009; Testing equipment: HC-2 oxygen index meter; Test results: The oxygen index is 36%. Materials with an oxygen index above 27% are considered flame-retardant materials.

[0043] UL94 vertical burning test: Test method: UL94 standard; Sample size: 125mm×13mm×3mm; Test result: V-0 (after two 10-second combustions, the afterflame time is ≤ 5 seconds, and there is no dripping).

[0044] 4) Thermal stability test Test method: TGA thermogravimetric analysis; Test equipment: TA Instruments Q500; Test conditions: nitrogen atmosphere, heating rate of 10℃ / min; Test results: The initial decomposition temperature is 350°C (magnesium hydroxide dehydration), the maximum decomposition rate temperature is 450°C (matrix resin decomposition), the residual carbon rate at 700°C is 25%, and the material has good thermal stability at processing and use temperatures.

[0045] To sum up, the explosion-proof conductive plastic of this embodiment achieves the conductive plastic surface resistivity standard through the synergistic effect of carbon nanotubes and metal fibers, which can effectively conduct away static charges; the addition of magnesium hydroxide gives the material good flame retardancy and smoke suppression properties, meeting the requirements for use in explosion-proof environments; the reasonable ratio of matrix resin and reinforcing filler ensures that the material has high tensile strength and impact toughness, meeting the needs of use in industrial environments. Example 3

[0046] This embodiment provides an explosion-proof conductive housing, which is made of the explosion-proof conductive plastic described in Example 1 or Example 2 through a conventional injection molding process, and is convenient for large-scale production and upgrading of existing products. Example 4

[0047] See also Figure 1 This embodiment provides an explosion-proof float device, including the explosion-proof conductive shell 1 and the cable 2 described in Example 3. A switch box 3 is provided inside the explosion-proof conductive shell 1, and a micro switch 4 and a steel ball 5 that can be close to or away from the micro switch 4 are provided in the switch box 3. The cable 2 includes a grounding wire 21, a common wire 22, a normally closed wire 23 and a normally open wire 24. The grounding wire 21 is connected to the explosion-proof conductive shell 1, and the common wire 22, the normally closed wire 23 and the normally open wire 24 are respectively connected to the common end, the normally closed end and the normally open end of the micro switch 4. A sealing sleeve 6 is provided at the connection between the cable 2 and the explosion-proof conductive shell 1.

[0048] Working Principle: Buoyancy changes the position of the float, and consequently, the position of the steel ball 5 within the switch box 3. When the explosion-proof float rises, the steel ball 5 moves away from the microswitch 4, connecting the common terminal to the normally open terminal. When the explosion-proof float sinks, the steel ball 5 approaches and presses the microswitch 4, connecting the common terminal to the normally closed terminal. If the environment is electrically charged, since the explosion-proof conductive housing 1 of the explosion-proof float is made of explosion-proof conductive plastic and the ground wire 21 of the cable 2 is connected to the explosion-proof conductive housing 1, the current will flow through the explosion-proof conductive housing 1 and the ground wire 21 to the ground.

[0049] The explosion-proof float device of this embodiment adopts explosion-proof conductive plastic with high conductivity in the explosion-proof conductive shell 1, which is combined with the grounding design to form a complete static electricity conduction path, ensuring that the surface charge of the equipment is quickly discharged to the ground, avoiding static electricity accumulation and causing electric sparks, and significantly improving the liquid level control safety in special operation scenarios such as mining and gas operations, and has important industrial application value; by providing a sealing sleeve 6 at the connection between the cable 2 and the explosion-proof conductive shell 1, it can effectively prevent flammable and explosive gases or liquids from entering the interior of the shell, thereby improving the safety of the equipment.

[0050] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the appended claims of the present invention.

[0051] The above is an exemplary description of the patent of the present invention in conjunction with the accompanying drawings. It is obvious that the implementation of the patent of the present invention is not limited to the above-mentioned method. As long as various improvements are made by adopting the method concept and technical solution of the patent of the present invention, or the concept and technical solution of the patent of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. An explosion-proof conductive plastic, characterized in that: The explosion-proof conductive plastic is prepared from the following raw materials in parts by weight: 25-30 parts of polyethylene, 10-15 parts of chlorinated butadiene, 8-10 parts of epoxy resin, 6-8 parts of glyceryl tristearate, 10-15 parts of carbon nanotubes, 5-10 parts of metal fiber, 8-10 parts of metal hydroxide, 2-3 parts of barium stearate, 1-2 parts of talc, 1-2 parts of zinc oxide, and 1-2 parts of silicon carbide.

2. The explosion-proof conductive plastic according to claim 1, characterized in that: The explosion-proof conductive plastic is prepared from the following raw materials in parts by weight: 25 parts of polyethylene, 10 parts of chlorinated butadiene, 8 parts of epoxy resin, 6 parts of glyceryl tristearate, 10 parts of carbon nanotubes, 5 parts of metal fibers, 8 parts of metal hydroxide, 2 parts of barium stearate, 1 part of talc, 1 part of zinc oxide, and 1 part of silicon carbide.

3. The explosion-proof conductive plastic according to claim 1, characterized in that: The explosion-proof conductive plastic is prepared from the following raw materials in parts by weight: 30 parts of polyethylene, 15 parts of chlorinated butadiene, 10 parts of epoxy resin, 8 parts of glyceryl tristearate, 15 parts of carbon nanotubes, 10 parts of metal fibers, 10 parts of metal hydroxide, 3 parts of barium stearate, 2 parts of talc, 2 parts of zinc oxide, and 2 parts of silicon carbide.

4. The explosion-proof conductive plastic according to claim 1, characterized in that: The metal hydroxide is aluminum hydroxide.

5. The explosion-proof conductive plastic according to claim 1, characterized in that: The metal hydroxide is magnesium hydroxide.

6. The explosion-proof conductive plastic according to claim 1, characterized in that: The preparation method of the explosion-proof conductive plastic comprises: Step S1, taking, by weight, 25-30 parts of polyethylene, 10-15 parts of chlorinated butadiene, 8-10 parts of epoxy resin, 6-8 parts of glyceryl tristearate, 10-15 parts of carbon nanotubes, 5-10 parts of metal fiber, 8-10 parts of metal hydroxide, 2-3 parts of barium stearate, 1-2 parts of talc, 1-2 parts of zinc oxide, and 1-2 parts of silicon carbide; Step S2, melt-blending polyethylene, chlorinated butadiene, epoxy resin and glyceryl tristearate; Step S3, adding carbon nanotubes, metal fibers and barium stearate to the mixture obtained in step S2, and stirring to uniformly disperse; Step S4, adding magnesium hydroxide, talc, zinc oxide and silicon carbide to the mixture obtained in step S3 and kneading; Step S5: adding the mixture obtained in step S4 into a twin-screw extruder for granulation to prepare explosion-proof conductive plastic particles.

7. The explosion-proof conductive plastic according to claim 6, characterized in that: In step S2, polyethylene, chlorinated butadiene, epoxy resin and glyceryl tristearate are added to an internal mixer and melt-blended at 150-180°C.

8. An explosion-proof conductive housing, characterized in that: The method is prepared from the explosion-proof conductive plastic according to any one of claims 1 to 7.

9. An explosion-proof floating ball device, characterized in that: It includes the explosion-proof conductive housing and cable as described in claim 8, a switch box is provided inside the explosion-proof conductive housing, a micro switch and a steel ball that can be close to or away from the micro switch are provided in the switch box, the cable includes a ground wire, a common wire, a normally closed wire and a normally open wire, the ground wire is connected to the explosion-proof conductive housing, and the common wire, the normally closed wire and the normally open wire are respectively connected to the common end, normally closed end and normally open end of the micro switch.

10. The explosion-proof floating ball device according to claim 9, characterized in that: A sealing sleeve is provided at the connection between the cable and the explosion-proof conductive shell.

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