128results about How to "Explosive" patented technology

The invention discloses a digestion method of soil metal elements. The method comprises the following steps: (1) weighing a soil sample; (2) preparing a mixed acid A which has a volume ratio of nitric acid to hydrofluoric acid to perchloric acid of 6-10:4-5:2; (3) preparing a mixed acid B which has a volume ratio of the hydrofluoric acid to perchloric acid of 8-10:1; (4) adding the mixed acid A to a digestion cup to decompose soil; (5) adding the mixed acid B to escape silicon; (6) removing acid: washing off acid globules suspending on the cup wall with 0.2-5% diluted hydrochloric acid or diluted nitric acid, controlling temperature of an electric heating plate at 110-130 DEG C and distilling to dryness; and (7) make constant volume: adding the diluted nitric acid to dissolve residue in the digestion cup, and adding the diluted nitric acid of the same concentration to the fixed volume for measurement. The method has high efficiency and improved safety. The method is applicable to measurement of metal elements such as Cu, Zn, Fe, Mn, Ca, Mg, Ni, Pb, Cd and the like in soil and produces accurate and reliable determination results.

The invention relates to the field of textile, in particular to a medical and sport bandage. The bandage is technical characterized by fabrics and a processing method of the fabrics; the selected materials break through materials on the prior market, weft yarn which is 100 percent of all-cotton yarn is selected, and warp yarn adopts fabric of all-cotton yarn packed spandex yarn as base cloth; 55 percent of ultrahigh elasticity and long retention time which do not exist in the bandage fabric on the prior market are obtained by a special processing method, and a bandage finished product can be directly stuck to the skin part needing protection in a disposable way, has favorable lightness, ventilation and comfortable feeling and novelty.

The invention discloses a marketing method of a big data intelligent marketing system, the main steps of which are as follows: S101: through the analysis of population attribute characteristics, orientate the gender, age, and education labels of the target group; S102: through the analysis of user state characteristics, orientate the target group Marriage, consumption and residence labels; S103: Through terminal device feature analysis, screen the device type, model, and system label of the target group; S104: Through the connection between the offline scene data collection device and the user, determine the user's time, location, and weather and other LBS information; S105: Use the TGI algorithm to analyze the characteristics of user interests and behavior preferences, quantify the degree of user preference, and make three-dimensional user portraits. The present invention quantifies the user's offline behavior by collecting user behavior data and offline hardware device data. The combination of user online data and offline data makes the prediction of user behavior more accurate, and produces marketing content around customer needs.

The invention relates to a purification method of ultra-pure aluminum, comprising the following steps: cleaning and drying raw refined aluminum, wherein the purity of the selected refined aluminum is at least 4N6, Mg is less than 6ppm, Ti is less than 0.2ppm and Zr is less than 0.2ppm; loading the selected raw refined aluminum into a purification furnace, sealing and vacuumizing the furnace, and heating to 680-750 DEG C by using a gas furnace to melt the solid raw refined aluminum to form liquid; moving the purification furnace heated to 680-750 DEG C to a crystal growing furnace which is kept at 660 DEG C inside by a crystal growing furnace heater, rotating the aluminum liquid of the purification furnace in the crystal growing furnace heater, and enabling the aluminum liquid inside the purification furnace to self-keep the crystallization speed at 5-10 cm / h by controlling the heat dissipating capacity of the crystal growing furnace and finishing the crystallization after 4-6 hours; cooling the crystallized purification furnace, taking out a crystallization ingot, removing 25-35 percent relative to the mass of the crystallization from the tail part of the crystallization ingot and obtaining a first purified aluminum ingot; placing the first purified aluminum ingot into the purification furnace again, and repeating purification until the aluminum ingot reaching the required precision is obtained.

The invention discloses a pretreatment method for determining multiple heavy metal elements in soil simultaneously. The pretreatment method comprises steps as follows: step (1): sample weighing: the soil is air-dried, ground and screened with a nylon sieve, a soil sample is weighed and put into a microwave digestion tube through a polytetrafluoroethylene long-neck funnel, and the funnel is slightly flapped before the funnel is removed so that all the soil sample attached to the wall of the funnel enter the digestion tube; step (2): digestion: nitric acid, hydrochloric acid and hydrofluoric acid are added to the digestion tube, a cover is screwed down, and the digestion tube is put into a microwave digestion instrument for digestion; step (3): acid driving: after microwave digestion is finished, hydrogen peroxide is added to the digestion tube; then the microwave digestion tube is put into a temperature-controlling acid driver in a fume cupboard for direct acid driving until the volume is smaller than 1 mL, then a solution is directly transferred to a volumetric flask, the volume is constant, and a to-be-tested solution is obtained. With the adoption of the pretreatment method, the digestion speed of the sample can be increased, the pre-treatment step of the sample is simplified, and the accuracy of the detection analysis result is guaranteed.

The invention discloses a high-speed and high-efficiency diamond grinding wheel as well as a preparation method and a usage method thereof. The diamond grinding wheel comprises a base body and a working layer, wherein the working layer comprises raw materials in percentage by mass as follows: 75%-93% of metal and ceramic composite binding agent powder and 7%-25% of diamond. The metal and ceramic composite binding agent powder is prepared from 65%-80% of pre-alloy powder and 20%-35% of glass-ceramic binding agent powder. When the grinding wheel is applied to a glass edge grinding machine, a combined grinding wheel comprising a fine grinding wheel and a rough grinding wheel is mounted on each of two electrode spindles, two combined grinding wheels are mounted in a cross manner, and rough grinding and fine grinding are performed simultaneously. The diamond grinding wheel prepared with the method has the characteristics of stable performance, sharp grinding, low cost and the like; the traditional glass edge grinding and chamfering machining manner is changed, glass machining procedures are greatly simplified, and the glass machining efficiency and quality are improved.

The invention relates to an emulsifying-type linear cutting operating fluid and uses thereof, and mainly solves the problem of short service life of the emulsifying-type electric-spark linear cutting operating fluid in the prior art. The emulsifying-type linear cutting operating fluid comprises the following components: by weight, a) 1-20 parts of a modified rosin blasting agent; b) 2-40 parts of a vegetable oilness agent; c) 0.2-5 parts of a pH adjustment agent; d) 0.1-10 parts of a coupling agent; e) 0.1-8 parts of an emulsifier; and f) 25-80 parts of base oil; the modified rosin blasting agent is selected from at least one from modified rosin prepared by esterification reaction or neutralization reaction of carboxyl in a molecular structure of rosin, or by addition reaction, hydrogenation reaction, disproportionation reaction or polymerization of double bonds of the molecular structure of the rosin, and the technical scheme solves the problem well, and can be used in the industrial production of the emulsifying-type electric-spark linear cutting operating fluid.

This invention provides a mail system and a method, which can analyze received mails intelligently on PC of users and hold legal mails in an inbox automatically and stores rubbish mails in an isolation region or deletes them, an E-mail system anti-rubbish mails includes a server and multiple kinds of customer ends and an anti-rubbish mail subsystem including: a rubbish mail verifying code rule library set at the server end and customer ends, a rubbish-mail collecting module set at the server end, a module for picking up the verifying codes and an upgrade service end module, a mail monitor module set at the customer end, a match module and a management module of the verifying codes.

The invention relates to a calcium sulfate composite oxidant for fireworks and crackers and a preparation method thereof, belonging to the technical field of chemical raw materials of the industry of the fireworks and crackers. The oxidant takes calcium sulfate and iron oxide as a main body assisted by barium nitrate, takes potassium permanganate and potassium perchlorate as initiators, and is added a small amount of an active agent. The preparation method comprises the following steps: roasting gypsum (calcium sulfate dihydrate), smashing, adding a mixed powder body of potassium permanganate and potassium perchlorate, grinding, smashing iron oxide, adding the active agent into the iron oxide powder, and then adding barium nitrate and grinding; and uniformly mixing the two types of ground powder. One of main raw materials of the invention is calcium sulfate which is non-toxic and has low price, and after being roasted the calcium sulfate, the calcium sulfate is not only an oxidant but also a moisture-proof agent and a leavening agent and also is a mechanical sensitivity buffer which is fine and smooth and slippery. Since the composite oxidant of the invention is prepared into the fireworks and crackers according to the traditional method, the fireworks and crackers has the advantages that the burning property is good, the safety is strong, the friction sensitivity and impact sensitivity are zero, and the production cost is greatly reduced.

A device for producing electrical discharges in an aqueous medium, the device has a first electrode 3 and a second electrode 4, where each electrode 3, 4 is made of a metal alloy 5 and each has an electrode tip 3C, 4C integral or otherwise affixed to said electrode 3, 4. Each tip 3C, 4C is made of a metal alloy and at least the outer surface of such tips includes a percentage of gold or platinum. Preferably the entire tip 3C, 4C portion is made of an alloy 5 having between 0.02 to 20 percent weight percent gold or platinum. The tip metal alloy 5 preferably has a base composition of steel, more preferably a base composition having either at least 4 percent cobalt or at least 4 percent nickel in combination with the small amount of gold or platinum. The use of gold or platinum provides exceptional electrical conductivity, but improves the ductility of the tip material such that the explosive and corrosive effects of the high voltage plasma discharges in the acoustic shock waves are greatly diminished.

A pendulum type wave machine relates to recreation and performing props and comprises a base, a support and a winch. The base is provided with a wave groove; the support comprises a frame body, a suspension shaft and a lifting beam, wherein the frame body is arranged on the base, the suspension shaft is supported by the frame body and horizontally arranged above the wave groove, and the lifting beam is supported by the frame body and arranged above the rear side of the suspension shaft; the suspension shaft is provided with a swing arm and a lifting arm, one end of the swing arm is connected with the suspension shaft, the other end of the swing arm is provided with a weight, a wave plate is arranged in front of the weight and is in a longitudinal arc shape, and both ends of the wave plate are provided with water baffles; one end of the lifting arm is connected with the suspension shaft, the other end of the lifting arm and the swing arm are provided with split-type automatic locks which are matched with each other, the support is provided with a pulley block, and the pulling rope of the winch is connected with the lifting arm through the pulley block. The pendulum type wave machine can produce suddenly-appeared local large waves, the flow speed of the surface water of a pool is fast, waves can be splashed up when the surface water is blocked, and good surgent effects, simple structure and low cost are achieved.

The invention discloses a method for extracting theophylline sodium salt or theophylline from a theophylline sodium salt or theophylline mother solution by a styrene type macroporous resin adsorption method, which comprises the following steps: (1) regulating the pH value of the theophylline sodium salt or theophylline mother solution; (2) filtering the mother solution and removing suspended impurities in the mother solution; (3) adsorbing the mother solution by adsorption resin; (4) desorbing the adsorption resin after adsorption saturation by a desorbing agent to obtain a desorption solution; (5) regulating the pH value of the desorption solution, standing and crystallizing theophylline sodium salt or theophylline; (6) centrifugally filtering; and (7) drying to obtain solid theophylline sodium salt. The method provided by the invention has the advantages that the theophylline sodium salt or theophylline crude product has better quality, the operation safety is better, the extraction efficiency is higher, the extraction cost is low, and the method is more suitable for mass production and facilitates realizing automatic operation. With the method disclosed by the invention, the extraction cost of the theophylline sodium salt and theophylline can be reduced, the extraction yield of the theophylline sodium salt and theophylline is increased, and the competitiveness of enterprises is enhanced.

The invention provides a method for surface modification of graphene by rare earth. The method comprises the following steps: roughening the surface of the graphene to generate oxygen-containing groups such as hydroxyl, carboxyl and an epoxy group by the characteristic that various atoms and molecules can be adsorbed and desorbed by the graphene; then mixing the graphene with a rare earth nitrate solution after the surface of the graphene is roughened; generating a complex by surface groups and rare earth cations; and finally carrying out reduction to obtain the graphene subjected to surface modification by the rare earth. The method has the beneficial effects that by the strong electromagnetic interaction between the oxygen-containing groups on the surface of the graphene and the rare earth ions, the rare earth ions are adsorbed to the surface of the graphene, the process is simple and easy to operate, an impurity phase is not guided in, and the rare earth ions and the graphene are combined well.

The invention relates to an impulse self-cleaning air filter, which comprises four parts as filter, self-cleaning, control and pressure protection. Wherein, the filter part utilizes three-stage filtration; the Venturi tube of self-cleaning part is relatively arranged above the filter cylinder of filter part; the passive pressure collecting point of sealing box is connected into the power control box of said control part; the signal terminal of PLC micro computer inside the power control box is connected to the electromagnetic impulse valve which is connected to the compressed air source and the injector of self-cleaning gas source; the pressure differential alarm inside the sealing box is serially connected between the PLC micro computer and the pressure differential controller; the pressure collecting point of passive pressure protective gate is connected between the PLC micro computer and the passive pressure protective gate. The invention has the advantages that: it has lower gas consumption, better washing effect, better sealing ability, long service life, while the gas leakage is zero, the filter accuracy is 0.3 mum, and it uses passive pressure protection.

The invention discloses a manufacturing method for preparing methanol diesel fuel from industrial methanol. The method comprises the following steps of: putting ethanolamine and naphthenic acid into the industrial methanol according to a certain proportion and mixing to obtain denatured methanol for later use; selecting alkylphenol ethoxylates, dimethyl carbonate, ethyl oleate and para-tert-butyl phenol according to a proportion, sequentially adding the alkylphenol ethoxylates, the dimethyl carbonate, the ethyl oleate and the para-tert-butyl phenol into a container and stirring for 20 to 30 minutes so as to obtain a methanol diesel fuel modifier for later use; and adding 75 percent diesel fuel mixed liquor into 20 percent denatured methanol, stirring fully and uniformly, adding 5 percent diesel fuel modifier and fully mixing so as to obtain finished methanol diesel fuel. A methanol diesel fuel product has the advantages of no delamination, high stability, no corrosion, no swelling, no emulsification, high explosive force, convenient use, readily available raw materials, low manufacturing cost and easy popularization.

The invention provides a filter element component. The component comprises a bracket cabin, wherein the bracket cabin is provided with a gas transmission shaft, and is connected with a filter element through a seal connection device; an enclosed cavity is formed in the bracket cabin; the lower end part of the gas transmission shaft is provided with a pulse head positioned in the enclosed cavity; and an air cylinder is arranged in the bracket cabin, and a piston end of the air cylinder is provided with a lift disk. A dust removal device comprises a draught fan chamber, a filter element chamber, a dust collection chamber and a gas storage tank which is connected to the filter element chamber through a gas transmission pipe, wherein a draught fan is arranged in the draught fan chamber; the draught fan chamber and the dust collection chamber are connected with the filter element chamber respectively; the input end of the gas transmission pipe is provided with a pulse valve; and at least one filter element component is arranged in the dust collection chamber. The filter element component combines pulse type gas transmission with the filter element and has the advantages of reasonable structure, strong explosive force of pulse gas and good dust removal effect; and each group of the filter element components can be cleaned independently, so that excellent cleaning effect can be ensured.

The invention discloses a catapult used on an aircraft carrier, comprising a power system and a seat frame, wherein, a rotating shaft is arranged on the upper frame of the seat frame; a cylinder is arranged outside the rotating shaft; at least one curly hair strip-shaped steel plate is arranged between the rotating shaft and the inner wall of the cylinder; a traction steel cable is wound outside the cylinder; a tractor is connected on the traction steel cable; and the power system is connected with the rotating shaft. The catapult has the characteristic of strong moment explosive force, leadsthe launching distance of an object to be far, can be rapidly reused; in each launching, the common electric power is only needed to lead the power system to tightly twist the spring-type steel plate, and the launching cost is low.

A synthetic diesel oil is prepared from the desulfurized heavy benzol as main raw material, adding proper quantity of kerosene and light diesel oil, further adding small amounts of cetane, number improver, viscosity index improver and flowability improver through mixing. Its advantages are high cetane number, heat value and power, low oil consumption, and high start-up performance.

The invention discloses a fruity nutrient beverage formula for enhancing explosive power. The fruity nutrient beverage formula for enhancing the explosive power is characterized in that per L(liter) of the beverage is prepared from the following components by weight: 50-70g of white granulated sugar, 6-8g of honey, 2-8g of isomaltulose, 4-12g of fructose, 0.2-0.4g of magnesium sulfate heptahydrate, 0.1-0.3g of potassium citrate, 0.12-0.18g of sodium citrate, 0.9-1.2g of citric acid monohydrate, 0.3-0.6g of vitamin C, 0.02-0.1g of vitamin E, 0.3-0.5g of taurine, 10-18mg of nicotinic acid, 1-1.6mg of vitamin B6, 1-1.8 micrograms of vitamin B12, 50-180g of fruit juice, 0.1-0.5g of wolfberry powder, 0.1-0.5g of black tea powder, 0.01-0.12g of ginseng extract, 0.1-0.5g of grape powder, 0.1-0.5g of maca powder, 1.0-1.4g of guarana extract, a proper amount of essence and the balance of water. Compared with the prior art, the fruity nutrient beverage formula for enhancing the explosive power has the effects of improving the explosive power, resisting exercise fatigue and improving exercise tolerance. The invention also provides a production process of the fruity nutrient beverage for enhancing the explosive power.

The invention provides a battery box system with the temperature automatically adjusted. The system comprises a cooling loop and a heating loop; a vehicle controller adjusts the temperature of a battery box through a low temperature controller and a high temperature controller according to the actual temperature of the battery box so that the temperature of the battery box can be kept within a settemperature range; meanwhile, the system monitors the working state of each component and reminds related personnel in time when an abnormality or fault occurs, so that it is guranateed that a battery pack, especially an electric vehicle lithium power battery pack, can work safely and reliably, and the service life of the battery pack can be prolonged.

An underground coal mine deep-hole directional blasting cartridge comprises a cartridge body (1), an upper connector (2) and a lower connector (3). One side or opposing sides of the cartridge body (1) are provided with cuts (4), and each cut is covered with a layer of metal sheet (5) which is provided with a V-groove by concaving; the bottom of every V-groove points to the center of circle along the peripheral radial direction of the cartridge body and is arranged at a 1 / 2 radius part. The underground coal mine deep-hole directional blasting cartridge allows for more ideal directional blasting.

The invention belongs to the field of self-assembly high molecular materials, and discloses a ternary brush polymer with amphipathy, and a nanoporous capsule constructed by the ternary brush polymer. The polymer is prepared through the following steps: (1) synthesizing a main chain so as to obtain a main-chain polymer; (2) synthesizing a side chain, and in the synthesizing process, introducing a functional group or performing functionalization on the synthesized side chain, so as to obtain a hydrophilic side-chain polymer with pH value responsiveness and adopting a photo-crosslinking structure; (3) mixing the main chain with the corresponding hydrophilic oleophylic side chain adopting the photo-crosslinking structure, wherein each unit functional group of the main chain and the corresponding hydrophilic oleophylic side chain adopting the photo-crosslinking structure can be subjected to a chemical reaction, and performing a one-step reaction in the presence of a catalyst so as to obtain the ternary molecule brush polymer with the amphipathy and the pH value responsiveness. According to the ternary brush polymer disclosed by the invention, sulfydryl-epoxy click chemistry is adopted, and Cu ionic catalysts are avoided, so that great convenience is brought for post-treatment of the reaction, the reaction rate and the reaction efficiency are both improved, and besides, the safety of the process for preparing nanovesicles is improved.

This invention discloses a methanol-gasoline fuel, which comprises: isopropanol 2-5 wt. %, fuel oil additive 0.02-0.1 wt. %, and methanol and gasoline as balance. The weight ratio of one of methanol and gasoline to the other is 2.34-8.5. The methanol-gasoline fuel does not demix, and largely improves the synchronic combustion of methanol and gasoline. Besides, the methanol-gasoline fuel has such advantages as high combustion efficiency, low production cost, and wide applications.

The invention discloses a crank-connecting rod mechanism for an engine of a miniature cross-country motorcycle. The crank-connecting rod mechanism comprises a left crank, a right crank, a crank pin and a connecting rod, wherein the big head end of the connecting rod is positioned between the left crank and the right crank; the big head end of the connecting rod, the left crank and the right crank are connected with each other through the crank pin; the axial lines of the left crank and the right crank are in the same line and are parallel to the axial line of the crank pin; the distance between the axial lines of the left crank and the right crank and the axial line of the crank pin is 28.5 to 30.5 mm; the diameter of the shaft part of the right crank is 95 to 97 mm; the axial length of the right crank is 64 to 66 mm; and the distance between the centre of an installing hole at the big head end of the connecting rod and the centre of the installing hole at the small head end of the connecting rod is 94.3 to 96.3 mm. By changing a plurality of key parameters of the crank-connecting rod mechanism, the crank-connecting rod mechanism for the engine of the miniature cross-country motorcycle meets the functional requirements on high raising speed, strong explosive power, high torque, high crank rotating speed of the engine of the miniature cross-country motorcycle, and has the characteristics of ingenious conception, simple structure, easy implementation and the like.

The invention discloses a ginger-red jujube-scallion beverage which mainly contains ginger juice, red jujube juice, scallion juice, white granulated sugar, water, conventional amount of food additive and the like. The preparation method of the ginger-red jujube-scallion beverage comprises the following steps: peeling and cleaning fresh ginger, cutting the fresh ginger into small slices which are 4-5cm long, cleaning fresh red jujube, peeling and cleaning fresh scallion, cutting the fresh scallion into the small slices which are 4-5cm long, placing the ginger slices, the red jujube and the scallion slices into a pot to be mixed together, heating to be boiling after adding water with mass fire firstly and then soft fire, boiling for 50-70 minutes, adding the white granulated sugar, continuously heating for 20-30 minutes, then fishing for the ginger slices, the red jujube and the scallion slices, cooling, filtering, adding the conventional amount of food additive, and evenly mixing, thus obtaining the ginger-red jujube-scallion beverage. The prepared ginger juice -red jujube juice -scallion juice beverage with a health care function not only has the efficacies of relieving exterior syndrome by diaphoresis, warming middle energizer and arresting vomiting, warming lung to stop cough, and detoxifying, but also has the efficacies of reinforcing the spleen to replenish qi, clearing heat and detoxicating, eliminating phlegm and stopping cough, relaxing spasm and relieving pain, and is sour and sweet in taste, faint in ginger fragrance and better in mouthfeel.

The present invention relates to an engine oxygen-rich fuel, which is formed by mixing an active hydrogen-free and oxygen-containing organic matter and an additive, wherein the active hydrogen-free and oxygen-containing organic matter comprises but is not limited to a ketone substance, an ether substance, an ester substance and an acetal substance, the ester substance content is 0-99.99%, the content of other substances is 0-100%, and the additive content is 0-10%. According to the present invention, the product can be separately used, and can further be used by mixing with a fossil fuel and an alcohol based fuel according to an arbitrary ratio so as to improve combustion quality; and the oxygen-rich fuel has characteristics of complete combustion, environmental-friendliness on environment, human body and engines, and low cost, and is the ideal fuel for replacing the existing fossil energy source.

The invention relates to the technical field of electronics, in particular to a solar anti-counterfeiting and tracing identification system. The solar anti-counterfeiting and tracing identification system mainly comprises a two-dimensional code 1, a two-dimensional code scanning / information display apparatus 2 and an information operation device 3, wherein the information operation device 3 comprises a data information storage module 31 and a wireless signal receiving / feedback module 32; and the system is characterized in that the two-dimensional code 1 is a laser two-dimensional code on the surface of lower-layer glass in a solar double-glass assembly. The system has the beneficial effects that the laser two-dimensional code is wide in storage space range and large in capacity; and the two-dimensional code laser-printed on a glass material is long in service life, so that a product can be traced perpetually.

The invention relates to an improved structure of a rotary engine. According to the invention, a temperature sensor, a temperature controller and a fuel injector are arranged in an explosion chamber. During operation, the engine is started by using low-ignition-point fuel; when a working temperature is reached, the temperature controller drives the fuel injector to supply high-ignition-point fuel for the explosion chamber for combustion, and the supplying of the low-ignition-point fuel is stopped. During an operation process, because a movable plate of the rotary engine is movably arranged, a communication channel is formed between the combustion chamber and the explosion chamber; high-temperature and high-pressure airflow and oil fires in the explosion chamber are filled into the combustion chamber through a gas inlet; and air newly filled in the combustion chamber can be compressed, such that an autogenous compression phenomenon occurs. After mixed combustion, higher explosive power can be obtained, and better mechanical rotation benefits can be provided.

The invention provides a mining explosion-proof submersible motor for a booster pump, and belongs to the technical field of explosion-proof submersible motors. The mining explosion-proof submersible motor is structurally characterized in that an independent connecting box mechanism is arranged on the upper portion of the motor, connecting wires between the inside and the outside of the motor are arranged in a cavity inside the connecting box mechanism and connected through power cable connecting posts, an adjusting bag is arranged in the connecting box mechanism, a joint between an upper end cover of the motor and the connecting box mechanism is provided with a first explosion-proof junction surface, a joint between the upper end cover of the motor and a motor body shell is provided with a second explosion-proof junction surface, and a joint between the motor body shell and a lower end cover of the motor is provided with a third explosion-proof junction surface. Cables are conveniently and rapidly connected, coal mining accidents caused by internal reasons of the motor can be effectively prevented when the motor breaks the surface of water as the water level in a mine falls, and the motor can safely run in scores of meters and even hundreds of meters of underwater environments.