Features <br> <br> flameproof electrical equipment explosion-proof electrical equipment box means having a flameproof enclosure, proof mark "d". Its manufacturing inspection standards should meet the requirements of GB3836.1-2000 and GB3836.2-2000 standards. Flameproof enclosures are explosion-proof enclosures that withstand internal explosion pressure and can prevent the propagation of explosive flames to the surrounding environment.
Explosion-proof explosion-proof box electrical equipment refers to the explosion-proof marking of electrical equipment with a flameproof enclosure. Its manufacturing inspection standards should meet the requirements of GB3836.1-2000 and GB3836.2-2000 standards.
Flameproof enclosure is an explosion-proof enclosure that can withstand the explosion pressure inside and can prevent the propagation of the explosion flame to the surrounding environment. The inside of the enclosure of the electrical device will enter the surrounding explosive gas mixture due to respiration. When the device generates spark and dangerous high temperature, The explosive gas mixture in the shell will be ignited to form a huge explosive force and shock wave. On the one hand, the flameproof enclosure should be able to withstand the internal explosion pressure without breaking; on the other hand, the joint surface of the explosion-proof enclosure should prevent the explosion flame from propagating outside the enclosure and ignite the surrounding explosive gas mixture. Therefore, the explosion-proof enclosure should have two properties of explosion-proof and explosion-proof.
The explosion pressure generated in a flameproof enclosure is affected by the concentration of the explosive gas mixture, the volume and shape of the enclosure, the location of the ignition source, the gap between the junctions, the initial pressure and temperature of the explosive gas mixture, and the like. Below the maximum detonation pressure, the explosion pressure is proportional to the concentration of the mixture; when the volume of the shell increases, its heat loss is relatively reduced and the explosion pressure is relatively high; in terms of the shape of the shell, the ratio of non-spherical vessels The explosion pressure of the spherical container is low; if the ignition position deviates from the center, the explosion pressure will decrease; the gap of the joint surface will increase and the explosion pressure will decrease; the initial pressure and temperature of the explosive gas mixture will increase, and the explosion pressure will increase.
Explosion-proof electrical equipment will have a detonation pressure of 0.5 MPa-2.0 MPa inside during explosion, which will cause impact on the shell wall. When the strength of the shell material does not meet the requirements, damage is caused, so the tensile strength and wall thickness of the shell should meet the requirements.
Flameproof type <Explosion-proof electrical equipment housing materials are made of metal materials. Commonly used steel plate, cast steel, cast aluminum alloy, cast iron and other materials. When using cast iron, the grade should not be lower than HT250. When cast aluminum is used, apply copper aluminum alloy with tensile strength of not less than 120 MPa and magnesium content of not less than 6%. When the volume of the shell is not more than 0.01 liters, it can be made of ceramic materials; when the volume of the shell is less than 2.0 liters, it can be made of plastic materials, but the structural strength of the plastic shell is affected by the molding process and the natural aging, generally used for the shell Flameproof parts with a volume of less than 0.1 liters.
Flameproof enclosures are exposed to the impact of explosion pressure, so the wall thickness value is larger than other explosion-proof enclosures. Take the cast aluminum shell as an example, the shell with a volume of not more than 2.0 liters, the thickness of the shell wall should be between 4.0-8.0mm, the thickness of the flange should be between 8.0-12.0mm; the wall thickness of the die-cast aluminum shell is due to the relative density Higher, the wall thickness can be designed to be smaller. When the volume is greater than 4.0 liters, ferrous metals such as cast steel must be used.
Flameproof explosion-proof box electrical equipment in the structural design, to avoid pressure overlap phenomenon. Pressure overlap generally occurs in an enclosure containing two or more cavities communicating in the form of small holes. When a cavity is detonated, its flame will propagate to the other cavity because the front of the flame is slower than the gas. The other cavity is first subjected to gas preloading and then ignited and exploded. The resulting detonation pressure is several times higher than that of the previous cavity and will cause serious damage to the housing. In fact, in the same cavity, pressure overlap can also occur when the electrical components are not installed properly.
In summary, the shell should not be made into a multi-cavity form in which small holes are communicated. The installation of electrical components in the shell should also avoid dividing the entire cavity into several small cavities. In addition, the ratio of the three-dimensional dimensions of the shell should not be too large. Otherwise there will be pressure overlap in the shell.
> Explosion-proof explosion-proof enclosure The explosion-proof enclosure has a flameproof enclosure that cannot be a seamless whole due to manufacturing, installation, maintenance, etc., but consists of many components. The connection gap between the parts will become a path through which explosives in the shell pass, igniting the surrounding explosive gas mixture. The mating parts of these parts are called flameproof joints, and the joint gaps are called explosion proof joint clearances.
The flameproofness of the flameproof enclosure is based on the theoretical basis of the cooling effect of the explosion flame facing the interior of the flameproof joint. The structure of the flameproof joint should ensure that the flame in the gap is extinguished and lose at least 20% of the heat. For this purpose, the width L of the flameproof joint surface, the gap (or diameter difference) i, and the distance l from the flange to the inner edge of the housing are to comply with the requirements of Tables 1 to 4 of GB 3836.2. The threaded flameproof joints of the IIC housing shall be Meet the requirements of Table 5. The surface roughness Ra of the flameproof surface shall not be less than 6.3 microns, and the precision of the flameproof thread shall not be less than 6H/6g. In order to prevent rust and corrosion, the surface of the flameproof surface should be coated with 204-1 grease> flameproof joint structure in the form of a planar type, a spigot type, and a threaded type. The cooperation of the joystick and the shaft belongs to a cylindrical structure, which is respectively applied to the junction of the shell and the shell cover; the junction of the shell and the joystick; the junction of the motor shaft extension and the end cap; and the introduction of the cable or wire The junction with the housing; the junction between the instrumentation and display window and the housing, etc. Transparent gaskets that are not frequently opened during maintenance should be made of a metal or metal-coated compressible, non-combustible material. There is also a glued joint structure. The adhesive material should be made of non-combustible material with good thermal stability. Adhesive bonding width: when the volume of the shell is less than 6.0mm; when the volume of the shell is greater than 100cm<:>2, it is not less than 10.0mm.
Several main components on the explosion-proof explosion-proof box enclosure) Fasteners The fasteners shall have sufficient mechanical strength so that when the shell explodes, it will not cause the bolts to break. Fasteners should be rust-proof, prevent loosening measures to ensure the gap between the plane-type flameproof joints. When tightening with bolts, if the spring washers are used to prevent looseness, simply press the spring washers flat and do not tighten too tightly. In order to avoid shearing of the fastening bolts by external forces, the dimensions of the joint between the cover and the housing must be the same.
">In order to be securely fastened, it is not permissible to use plastics or light alloys for the manufacture of bolts and nuts, and it is not permissible to tap the screw holes directly in the plastic housing.
The depth of the screw hole shall be such that after the bolts and screw holes are tightened, a thread allowance of more than 2 times the thickness of the lock washer is to be left. The thickness of the surrounding and bottom of the impermeable screw hole shall not be less than one-third of the diameter of the bolt, but it shall have a margin of at least 3.0mm.
Holes in the process through holes or structures that must penetrate through the housing shall be blocked by a cylindrical or threaded flameproof structure and the exposed ends shall be permanently fixed.
Electrical equipment that generates sparks and arcs during normal operation must be provided with interlocking devices. The mechanism of the interlocking device shall ensure that the cover cannot be opened when the power is turned on; the power cannot be turned on after the cover is opened.
Bolted housings allow the use of warning signs instead of interlocks. Warning board content: It is strictly forbidden to open the lid!
The transparent part is mainly used for the transparent cover of the lighting fixture, instrument window, indicator cover and other parts. The transparent cover of the lighting fixture is made of tempered glass or high-boron glass; the transparent part of the instrument window is made of optical glass or tempered glass; the former has good transparency, but the thickness should be increased; the transparent part of the indicator cover is made of tempered glass, Made of polycarbonate plastic. All above should be able to withstand the specified impact test and pressure test.
The method of fixing the transparent member on the flameproof enclosure includes two types: adhesive type and cushion type. Adhesive or pad width should be in line with the introduction of the device is the explosion-proof components of the cable or wire into and out of electrical equipment. According to its structure, it is divided into rubber sealing ring type, packing type sealing type and threaded cable introduction method.
The rubber seal type introduction device uses a compression nut to hold the rubber sealing ring tightly around the cable or wire and at the same time squeezing into the inner hole of the device to achieve a dense effect. In order to meet the explosion-proof requirements, the non-compression axial length of the seal ring is specified: for the seal ring with the same outer diameter and multi-layer inner hole, when the diameter of the round cable is not more than 20mm, the perimeter of the non-circular cable cross section is not more than 60mm, The minimum is 20mm; when the diameter of the round cable is larger than 20mm, the non-circular cable has a section perimeter of more than 60mm, the minimum is 25mm; for the same outer diameter, there is only one inner hole of the seal ring, and the non-compression axial length of the seal ring: When the volume of the shell is less than 0.1 liters, the minimum is 10mm; when the volume of the shell is greater than 0.1 liters, the minimum is 16mm; for the flameproof shell with IIC volume greater than 2.0 liters, the non-compression axial length of the seal ring should meet the multi-layer inner hole Seal the relevant regulations.
The compression parts of the seal ring have two structures, namely a compression nut type and a pressure plate type, all made of metal materials. When the diameter of the round cable is greater than 20mm, the pressure member should have an anti-pull mechanism.
Explosion-proof explosion-proof box electrical equipment refers to the explosion-proof marking of electrical equipment with a flameproof enclosure. Its manufacturing inspection standards should meet the requirements of GB3836.1-2000 and GB3836.2-2000 standards.
Flameproof enclosure is an explosion-proof enclosure that can withstand the explosion pressure inside and can prevent the propagation of the explosion flame to the surrounding environment. The inside of the enclosure of the electrical device will enter the surrounding explosive gas mixture due to respiration. When the device generates spark and dangerous high temperature, The explosive gas mixture in the shell will be ignited to form a huge explosive force and shock wave. On the one hand, the flameproof enclosure should be able to withstand the internal explosion pressure without breaking; on the other hand, the joint surface of the explosion-proof enclosure should prevent the explosion flame from propagating outside the enclosure and ignite the surrounding explosive gas mixture. Therefore, the explosion-proof enclosure should have two properties of explosion-proof and explosion-proof.
The explosion pressure generated in a flameproof enclosure is affected by the concentration of the explosive gas mixture, the volume and shape of the enclosure, the location of the ignition source, the gap between the junctions, the initial pressure and temperature of the explosive gas mixture, and the like. Below the maximum detonation pressure, the explosion pressure is proportional to the concentration of the mixture; when the volume of the shell increases, its heat loss is relatively reduced and the explosion pressure is relatively high; in terms of the shape of the shell, the ratio of non-spherical vessels The explosion pressure of the spherical container is low; if the ignition position deviates from the center, the explosion pressure will decrease; the gap of the joint surface will increase and the explosion pressure will decrease; the initial pressure and temperature of the explosive gas mixture will increase, and the explosion pressure will increase.
Explosion-proof electrical equipment will have a detonation pressure of 0.5 MPa-2.0 MPa inside during explosion, which will cause impact on the shell wall. When the strength of the shell material does not meet the requirements, damage is caused, so the tensile strength and wall thickness of the shell should meet the requirements.
Flameproof type <Explosion-proof electrical equipment housing materials are made of metal materials. Commonly used steel plate, cast steel, cast aluminum alloy, cast iron and other materials. When using cast iron, the grade should not be lower than HT250. When cast aluminum is used, apply copper aluminum alloy with tensile strength of not less than 120 MPa and magnesium content of not less than 6%. When the volume of the shell is not more than 0.01 liters, it can be made of ceramic materials; when the volume of the shell is less than 2.0 liters, it can be made of plastic materials, but the structural strength of the plastic shell is affected by the molding process and the natural aging, generally used for the shell Flameproof parts with a volume of less than 0.1 liters.
Flameproof enclosures are exposed to the impact of explosion pressure, so the wall thickness value is larger than other explosion-proof enclosures. Take the cast aluminum shell as an example, the shell with a volume of not more than 2.0 liters, the thickness of the shell wall should be between 4.0-8.0mm, the thickness of the flange should be between 8.0-12.0mm; the wall thickness of the die-cast aluminum shell is due to the relative density Higher, the wall thickness can be designed to be smaller. When the volume is greater than 4.0 liters, ferrous metals such as cast steel must be used.
Flameproof explosion-proof box electrical equipment in the structural design, to avoid pressure overlap phenomenon. Pressure overlap generally occurs in an enclosure containing two or more cavities communicating in the form of small holes. When a cavity is detonated, its flame will propagate to the other cavity because the front of the flame is slower than the gas. The other cavity is first subjected to gas preloading and then ignited and exploded. The resulting detonation pressure is several times higher than that of the previous cavity and will cause serious damage to the housing. In fact, in the same cavity, pressure overlap can also occur when the electrical components are not installed properly.
In summary, the shell should not be made into a multi-cavity form in which small holes are communicated. The installation of electrical components in the shell should also avoid dividing the entire cavity into several small cavities. In addition, the ratio of the three-dimensional dimensions of the shell should not be too large. Otherwise there will be pressure overlap in the shell.
> Explosion-proof explosion-proof enclosure The explosion-proof enclosure has a flameproof enclosure that cannot be a seamless whole due to manufacturing, installation, maintenance, etc., but consists of many components. The connection gap between the parts will become a path through which explosives in the shell pass, igniting the surrounding explosive gas mixture. The mating parts of these parts are called flameproof joints, and the joint gaps are called explosion proof joint clearances.
The flameproofness of the flameproof enclosure is based on the theoretical basis of the cooling effect of the explosion flame facing the interior of the flameproof joint. The structure of the flameproof joint should ensure that the flame in the gap is extinguished and lose at least 20% of the heat. For this purpose, the width L of the flameproof joint surface, the gap (or diameter difference) i, and the distance l from the flange to the inner edge of the housing are to comply with the requirements of Tables 1 to 4 of GB 3836.2. The threaded flameproof joints of the IIC housing shall be Meet the requirements of Table 5. The surface roughness Ra of the flameproof surface shall not be less than 6.3 microns, and the precision of the flameproof thread shall not be less than 6H/6g. In order to prevent rust and corrosion, the surface of the flameproof surface should be coated with 204-1 grease> flameproof joint structure in the form of a planar type, a spigot type, and a threaded type. The cooperation of the joystick and the shaft belongs to a cylindrical structure, which is respectively applied to the junction of the shell and the shell cover; the junction of the shell and the joystick; the junction of the motor shaft extension and the end cap; and the introduction of the cable or wire The junction with the housing; the junction between the instrumentation and display window and the housing, etc. Transparent gaskets that are not frequently opened during maintenance should be made of a metal or metal-coated compressible, non-combustible material. There is also a glued joint structure. The adhesive material should be made of non-combustible material with good thermal stability. Adhesive bonding width: when the volume of the shell is less than 6.0mm; when the volume of the shell is greater than 100cm<:>2, it is not less than 10.0mm.
Several main components on the explosion-proof explosion-proof box enclosure) Fasteners The fasteners shall have sufficient mechanical strength so that when the shell explodes, it will not cause the bolts to break. Fasteners should be rust-proof, prevent loosening measures to ensure the gap between the plane-type flameproof joints. When tightening with bolts, if the spring washers are used to prevent looseness, simply press the spring washers flat and do not tighten too tightly. In order to avoid shearing of the fastening bolts by external forces, the dimensions of the joint between the cover and the housing must be the same.
">In order to be securely fastened, it is not permissible to use plastics or light alloys for the manufacture of bolts and nuts, and it is not permissible to tap the screw holes directly in the plastic housing.
The depth of the screw hole shall be such that after the bolts and screw holes are tightened, a thread allowance of more than 2 times the thickness of the lock washer is to be left. The thickness of the surrounding and bottom of the impermeable screw hole shall not be less than one-third of the diameter of the bolt, but it shall have a margin of at least 3.0mm.
Holes in the process through holes or structures that must penetrate through the housing shall be blocked by a cylindrical or threaded flameproof structure and the exposed ends shall be permanently fixed.
Electrical equipment that generates sparks and arcs during normal operation must be provided with interlocking devices. The mechanism of the interlocking device shall ensure that the cover cannot be opened when the power is turned on; the power cannot be turned on after the cover is opened.
Bolted housings allow the use of warning signs instead of interlocks. Warning board content: It is strictly forbidden to open the lid!
The transparent part is mainly used for the transparent cover of the lighting fixture, instrument window, indicator cover and other parts. The transparent cover of the lighting fixture is made of tempered glass or high-boron glass; the transparent part of the instrument window is made of optical glass or tempered glass; the former has good transparency, but the thickness should be increased; the transparent part of the indicator cover is made of tempered glass, Made of polycarbonate plastic. All above should be able to withstand the specified impact test and pressure test.
The method of fixing the transparent member on the flameproof enclosure includes two types: adhesive type and cushion type. Adhesive or pad width should be in line with the introduction of the device is the explosion-proof components of the cable or wire into and out of electrical equipment. According to its structure, it is divided into rubber sealing ring type, packing type sealing type and threaded cable introduction method.
The rubber seal type introduction device uses a compression nut to hold the rubber sealing ring tightly around the cable or wire and at the same time squeezing into the inner hole of the device to achieve a dense effect. In order to meet the explosion-proof requirements, the non-compression axial length of the seal ring is specified: for the seal ring with the same outer diameter and multi-layer inner hole, when the diameter of the round cable is not more than 20mm, the perimeter of the non-circular cable cross section is not more than 60mm, The minimum is 20mm; when the diameter of the round cable is larger than 20mm, the non-circular cable has a section perimeter of more than 60mm, the minimum is 25mm; for the same outer diameter, there is only one inner hole of the seal ring, and the non-compression axial length of the seal ring: When the volume of the shell is less than 0.1 liters, the minimum is 10mm; when the volume of the shell is greater than 0.1 liters, the minimum is 16mm; for the flameproof shell with IIC volume greater than 2.0 liters, the non-compression axial length of the seal ring should meet the multi-layer inner hole Seal the relevant regulations.
The compression parts of the seal ring have two structures, namely a compression nut type and a pressure plate type, all made of metal materials. When the diameter of the round cable is greater than 20mm, the pressure member should have an anti-pull mechanism.
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Product Description
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Input Votage
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220-240V~50Hz/120V~60Hz
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Input Power
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1200W/10A
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No load Speed
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5000rpm
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Blade diameter
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165mm
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Cutting depth with track
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90°-54mm, 45°-38mm
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Feature
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Anti kickback & lock-on-track design
Pre-cut setting for clean & precise cutting Adjustable cutting depth Speed Regulator (optional) |
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