59results about How to "Achieve long-term use" patented technology

The invention provides a rolling brush cleaning mechanism and a dust collector and relates to the technical field of cleaning equipment. The rolling brush cleaning mechanism comprises a scraper component, a rolling brush component and a pushing component, wherein the rolling brush component comprises a rolling brush shaft and a rolling brush cylinder which are mutually connected; a preset distance is reserved between the scraper component and the rolling brush cylinder, and the pushing device is connected with the rolling brush shaft; the rolling brush cylinder is driven by the pushing device to move to the position of the scraper component, so that the scraper component and the rolling brush cylinder are abutted to cut off hairs winding the outside of the rolling brush cylinder, and accordingly, cleaning of a rolling brush is realized. The technical problems in the prior art that the hairs wind a floor brush and cannot be cleaned easily, and consequently, internal failures of the dust collector are caused are solved; long-time use of the rolling brush is realized, the service life of the rolling brush is prolonged, the rolling brush of the dust collector is more convenient to use, and higher practicability is realized.

The invention relates to the field of high-altitude rescue descend control devices, in particular to a planet running impact type descent control device damping device. A special impact damping manneris mainly adopted for achieving constant-speed slow descending, and the problem that the slow descending effect is influenced by impact wear is solved. In the structure, a fixed inner gear ring is arranged in a box body, four small gears are assembled on a rope sheave and engaged with the inner gear ring, the rope sheave drives the four small gears to do planet rotating running, each small gear drives a pair of centrifugal blocks to rotate at a high speed and do planet running through a sliding groove, and through centrifugal force, mutual impacting and friction happen between the centrifugalblocks in the different sliding grooves and between the centrifugal blocks and the inner wall of the box body. When the gear ratio of the gear ring and the gears is not an integer, the centrifugal blocks constantly move and change at the impact point of the inner wall of the box body. Due to the fact that impacting damping is adopted as the main and the damping effect cannot be influenced by wearof the centrifugal blocks and the inner wall of the box body, the device is waterproof and oil-proof and is stable in performance, long in service life, compact in structure, small in size and low inmanufacturing cost.

The invention relates to a biomedical electrode, in particular to a biomedical electrode with a surface micro-structure array and a manufacturing method thereof. The biomedical electrode with the surface micro-structure array characteristic comprises a metal electrode core, a foam materiel back lining and a shielded conductor; the manufacturing method of the biomedical electrode comprises the steps as follows: sheet metal serves as the raw material of the metal electrode core, a laser micro-processing technology is adopted to form a micro-structure array with the longitudinal distance of 0.1-0.3 mm and the transverse distance of 0.1-0.3 mm on the metal electrode core, cleaning and drying are performed, then hydrochloric acid is utilized to remove an oxidizing layer and impurities, alcohol is utilized for cleaning, and a Au or Ag / AgCl thin layer is plated on the surface of the metal electrode core; the metal electrode core is stuck to the surface of the foam materiel back lining by glue; the shielded conductor penetrates through the foam materiel back lining, and is connected to the surface of the metal electrode core with the method of filling conductive silver adhesive, and solderless connection of the metal electrode core with the shielded conductor can be formed after the conductive silver adhesive is solidified, so that the biomedical electrode with the surface micro-structure array is obtained.

The invention discloses a microfiltration membrane oil filed sewage processing device. The device comprises a flocculation settlement facility, a cyclone oil-water separator, a multistage mechanical filtering device, and a metal membrane filtering device, which are connected in sequence. The multistage mechanical filtering device comprises a walnut shell filtering device, a fine walnut shell filtering device, a modified fiber ball filtering device, and a dual-layer filtering material filtering device, which are connected in sequence. The sewage processing method comprises the following steps: removing pollutants by the flocculation settlement facility, pumping sewage into the cyclone oil-water separator to carry out separation, and filtering the separated water phase by the walnut shell filtering device, the fine walnut shell filtering device, the modified fiber ball filtering device, the dual-layer filtering material filtering device, and the metal membrane filter device to obtain qualified water phase. The design is novel, the operation is safe, stable, and reliable, the effect is good; the produced water in oil field can be purified and the processed water can reach the standards of reinjection. The provided device can realize gas-water combined backwashing, the backwashing effect is guaranteed, and the device can be used for a long term.

The invention discloses a stainless steel temporary power metering tank, and relates to an electric energy metering tank. A tank cover (3) connection structure for preventing rain from entering a tank body is buckled with the integral tank body; the integral tank body consists of an inverted U-shaped rear board (6), a board (7) on one side and a board (24) on the other side which are formed by stamping a whole stainless steel plate; two s-shaped and z-shaped corresponding side door frames (11) are stamped on the two end parts of the inverted U-shaped structure; a concave middle frame (21) is arranged between the two side door frames (11); and the rear board (6) of two cavities is respectively fixedly connected with an insulating board (8) through a fixing screw (12). A bending mode is adopted at positions of the tank cover, a cabinet, door heads, the frames and the like, so that the solidity of the temporary power metering tank is further improved; and the tank has a reasonable structure, so the aim of long-term use is fulfilled.

The invention relates to a safe and high-energy-efficiency cognitive D2D communication method. The method comprises the steps of performing channel quality evaluation on a small cell base station andcognitive users; establishing a joint resource allocation model about wireless charging power and wireless charging time; calculating an optimal resource distribution result by adopting an iterative optimization algorithm; transmitting the radio frequency signal at the optimal wireless charging power; the cognitive user collects radio frequency signal energy within the optimal wireless charging time; and the small cell base station interferes with the eavesdropper with the optimal wireless charging power, and the cognitive user sets the maximum feasible transmitting power of the small cell base station and performs cognitive D2D communication. The method is oriented to an ultra-dense small cellular network; the cognitive radio technology is used for achieving spectrum sharing, the energy collection technology is used for conducting wireless charging on cognitive users, meanwhile,interference is conducted on eavesdroppers through manual noise, safe and high-energy-efficiency cognitive D2D communication can be achieved, and the spectrum efficiency, the energy efficiency and the physical layer safety are effectively improved.

The invention relates to a cooling device generating a flat jet and a manufacturing method thereof, the cooling device is characterized in that an inner pipe and an outer pipe of the cooling device are eccentrically fixed through a positioning strip for forming a cavity between the inner pipe and the outer pipe, a slit is formed in the axial direction, the width of the slit can be regulated through a tightening bolt and a compression bolt, a flange is welded at the inlet end of the inner pipe for connecting with a cooling medium pipeline, a steel plate is welded at the outlet end for sealing,and the cooling device is further provided with an inner cavity pollution discharge port. An end plate is welded at the inlet end of the cavity between the inner pipe and the outer pipe and used for sealing, the outlet end of the cavity and the flange are sealed through the end plate, and pollution can be discharged out of the cavity between the inner pipe and the outer pipe. Two rows of tidy flow through holes are formed on the inner pipe, and a cooling medium enters into the inner pipe via the flange at the inlet end, and then flows into the cavity between the inner pipe and the outer pipe via the flow through holes and further forms flat jet via the slit for cooling the steel plate. The eccentric arrangement of the inner pipe and the outer pipe of the device can form multiple damping effects for the cooling medium, the slit enables the cooling medium to form the uniform flat jet in the width direction of a rolling line, and multiple reinforcing ribs are welded outside the outer pipe in the radial direction for preventing deformation.

The invention discloses a computer heat dissipation device, which comprises a computer case, heat dissipation holes, a refrigerator, a first L-shaped pipe, an air blower, a bracket, a second L-shapedpipe, a horizontal pipe, a first lantern ring, a vertical pipe, a second lantern ring, a first motor, a rotary block, a cross bar, a sliding block, a round sliding block, a second motor, a vane, a pore plate, a barrel body, a T-shaped chute, a T-shaped sliding block, a cross plate, a first spring, a vertical plate, a rubber sleeve, an expansion link, a second spring, a chute, an electric wire anda plug, wherein the bottom surface of the computer case is provided with the barrel body. The device is easy in operation and can quickly carry out heat dissipation, cold air is blown out of the pipeto blow air to a computer component so as to quickly take heat on the component away, in addition, the rotary block is arranged, so that the computer component can receive air in an omnibearing way, and in addition, air can be evenly blown. The first spring and the second spring are arranged, omnibearing vibration reduction can be realized, components in the computer case can be effectively guaranteed, a purpose that the computer is used for a long time is achieved, and the service life of the computer is prolonged.

The invention discloses a gas-storage water resistor used in the vertical state. The water resistor comprises a first water resistor outer cylinder, a second water resistor outer cylinder, an output electrode member and an input electrode. When the water resistor is used, the first water resistor outer cylinder and the second water resistor outer cylinder are in vertical state; the lower end of the first water resistor outer cylinder is connected with the upper end of the output electrode member; the upper end of the second water resistor outer cylinder is connected with the lower end of the output electrode member; the lower end of the second water resistor outer cylinder is connected with the input electrode; the first water resistor outer cylinder and the second water resistor outer cylinder are communicated to form a cylinder body; the cylinder body is internally filled with an electrolyte solution; and all components in the water resistor are sealed with the outside world. The gas-storage water resistor prevents bubbles from being accumulated on the electrode surface, reduces inspection and maintenance time and improves work efficiency.

The invention provides a high-temperature-resistant ferrochrome alloy for a heat-resistant cushion block of a steel rolling heating furnace. The alloy is prepared from, by weight, 80-90% of chromium,1.5-3.5% of tungsten, 10-18% of iron and inevitable impurities. The heat-resistant cushion block prepared from the high-temperature-resistant ferrochrome alloy and by vacuum smelting and precision casting can be used for a long time at the furnace temperature of 1,300 DEG C-1,420 DEG C in the steel rolling heating furnace; and meanwhile, a supporting billet arranged on a heating furnace water-cooling beam has good high-temperature-resistant compression creep property and high-temperature-resistant property, so that the oxidation, creep and nodulation are relieved, and the service life of the heat-resistant cushion block is prolonged.

The invention provides cold-resistant flame-retardant covering glue. The cold-resistant flame-retardant covering glue comprises 0-20 parts of natural rubber, 60-80 parts of butadiene styrene rubber, 20-30 parts of butadiene rubber, 3-6 parts of zinc oxide, 0-2 parts of stearic acid, 1-2 parts of an accelerator, 2-4 parts of an antiager; 1-2 parts of paraffin, 1.5-3 parts of sulfur, 3-8 parts of antimonous oxide, 5-12 parts of chlorinated paraffin, 50-90 parts of a solid flame retardant, 10-15 parts of a flame-retardant lubricant and 35-45 parts of carbon black. According to the cold-resistantflame-retardant covering glue provided by the invention, the good cold-resistant and flame-retardant properties are achieved under the combined action of specific components and component contents, the flame retardant property of the glue can be ensured, the effects that the glue is not hardened and embrittled at the low temperature of -60 DEG C are ensured, the glue is resistant to cracking, andthe service life of a conveyor belt can be prolonged. The invention further provides cold-resistant flame retardant middle glue, cold-resistant flame-retardant core glue and the cold-resistant flame-retardant steel wire core conveyor belt.

The invention provides an aluminum oxide / aluminum-based spinel composite material as well as a preparation method and catalytic application thereof. The preparation method comprises the steps of cleaning dust and impurities on the surfaces of aluminum oxide particles with water, and then drying; preparing a mixed solution containing aluminum ions and other metal ions; adding aluminum oxide particles into the mixed solution for vacuum impregnation; taking out the impregnated particles and drying to obtain precursor particles; and calcining the precursor to obtain the granular aluminum oxide / aluminum-based spinel composite material. The preparation method is simple in process, low in cost and suitable for large-scale production, and the prepared composite material has excellent catalytic performance and can efficiently activate persulfate to degrade organic pollutants in a wide pH range from acidity to alkalinity; and meanwhile, the composite material has appropriate particle size and stable structure and physicochemical properties, can be used in a stirring barrel, a fixed bed and a fluidized bed for a long time, and realizes continuous and long-acting catalytic degradation of organic wastewater.

The invention relates to a method and a device for heterogeneously catalyzing oxidation of COD in wastewater by using hydrogen peroxide. The method comprises the following steps: decomposing hydrogen peroxide into hydroxyl radical with higher oxidization performance by using a solid catalyst, then carrying out oxidization reaction with organic matters in the wastewater via the hydroxyl radical, converting the organic matters into carbon dioxide and water and achieving the purpose of reducing COD in the wastewater. According to the method, the mass ratio of hydrogen peroxide to COD in the wastewater is (0.5-1) to 1, and the ratio of the mass of the solid catalyst to the flow of hydrogen peroxide is 1 to (100-300). A catalytic oxidation tower for implementing the method is designed; a wastewater tank and a hydrogen peroxide tank are formed in the upper part of the tower; a catalyst area is arranged at the middle part of the tower; a water distribution area is arranged at the lower part of the tower. The method and the device have the advantages that the effect of recycling a hydrogen peroxide liquid Fenton catalyst is realized, the generation amount of sludge is low, the consumption of hydrogen peroxide is reduced, the device is ingenious and reasonable in design, and the overall device can reduce investment and improve the removal rate of COD.

The invention relates to the field of roller compaction granulation, in particular to a drum of a granulator. It includes a cylinder and an air injection mechanism. There is a cavity inside the cylinder. The air injection mechanism is located in the cavity and is in sealing contact with the side wall of the cavity. The air injection mechanism does not rotate with the cylinder. A granulation chamber is set on the outer surface of the cylinder. The chamber communicates with the jet mechanism. The structure sprays air through the air injection structure, so as to prevent the drum of the granulation equipment from being clogged by rolling, improve the granulation efficiency, and prevent the clogging of the drum surface. The air is injected through the air injection structure, so as to prevent the drum of the granulation equipment from being clogged by rolling, improve the granulation efficiency, and prevent the clogging of the drum surface. Utilize the speed and pressure of the rapidly entering airflow, and use the instantaneous air pressure to dredge the granulation cavity to ensure the effectiveness of the granulation cavity dredging; ensure that the granulation cavity can be dredged in time.

The invention provides a post-it type smart water level detector with a wireless charging function. The water level detector comprises a housing and a water level detecting contact point. The detector also comprises a wireless module, a wireless charging module, a polymer lithium battery, an electric quantity detection unit, and a power supply management unit. The wireless module comprises a wireless signal receiving and sending unit and a processor and forms a network with wireless module gateway of other water level detectors of the same type. The wireless charging module is equipped with a wireless charging coil and a charging chip and realizes wireless charging with a wireless charger. The water level detector comprises a wireless charging unit, which can charge the water level detector by means of the wireless charger without the need of changing the fixed position, and long-term usage of the water level detector can be achieved. The water level detector is equipped with the wireless module and realizes remote checking and reminding of real-time information through the gateway networking, and a user can configure parameter and other settings of the water level detector remotely.

The invention relates to a rainwater recovery and reuse system and a rainwater utilization method. The system includes a windmill house fixed on the ground, a windmill installed on the side of the windmill house, a ground water tank installed in the windmill house, and an underground water tank arranged underground. It also includes the Archimedes pump installed on an incline, the inlet of the Archimedes pump is set in the underground water tank, the outlet of the Archimedes pump is set above the ground water tank, and the ground water tank is connected with a water outlet pipe, and the water tank above the ground water is also included. The rainwater collection device of the tank, the rainwater collection device is connected with the underground water tank through the drainage pipe, the windmill is driven by the wind, and the Archimedes pump is driven by the windmill to transport the rainwater in the underground water tank to the ground water tank, which not only saves energy, but also Long-term use of rainwater can be realized.

Disclosed is a method wherein propylene, isobutylene or a tertiary butanol is catalytically oxidized with molecular oxygen in a vapor phase for producing corresponding unsaturated aldehyde and unsaturated carboxylic acid. This method enables to use a catalyst for a long time. Specifically disclosed is a method wherein propylene, isobutylene or a tertiary butanol as a raw material is catalytically oxidized with molecular oxygen in a vapor phase in the presence of a catalyst, which is composed of a complex oxide essentially containing molybdenum, bismuth and iron, for producing corresponding unsaturated aldehyde and unsaturated carboxylic acid. In this method, the reaction pressure and / or the molar ratio between oxygen and the raw material are controlled so that the reaction rate of the raw material is kept constant at a certain level within a temperature range of not less than (TA - 15) DEG C and not more than TA DEG C with TA DEG C being the boundary temperature of the activation energy of the catalyst.

The invention discloses a novel environmentally-friendly decorative plate material, which includes the following raw materials: waste and old plastic, alumina silicate fibre, a smoke suppressor, chitosan, an antiradiation agent, calcium carbonate, wollastonite powder, diatomite, a fire retardant, a mildew inhibitor, a coalescing agent and environmental glue. The decorative plate material of the invention has low material cost, is easy to prepare, is harmless to human body and is convenient for people to use for a long time. Since diatomite which has a natural microporous structure is added in the raw materials, respiratory humidification can be realized, and diatomite can also adsorb toxic and harmful substances in the air to improve the indoor environment. Since alumina silicate fibre has characteristics of high temperature resistance, good heat stability, low thermal conductivity, elasticity, sound insulation, electric insulation, good chemical stability, etc., the material has high temperature resistance and other characteristics and is endowed with more advantages. By using lots of waste and old plastic as the raw material, the waste and old plastic can be reused, and utilization rate of the waste and old plastic is increased.

The invention provides a stony desertification preventing system and a preventing method thereof. The system comprises protective devices and fertilizer slow-release blocks, wherein the protective devices comprise protective screens and fixing rings, the protective screens are flexible screens, the protective screens are quadrangular, and four corners of each protective screen are connected with the corresponding fixing rings respectively; the fixing rings are rigid rings, the fixing rings comprise inner rings and outer rings, each inner ring is in a shape of a cylinder with two open ends, theinner rings are sleeved with the outer rings, the outer rings are in shapes of circular rings, inner walls of the outer rings are connected with outer walls of the inner rings, and a plurality of connection holes to which each protective screen is fixed are preserved in the corresponding outer ring; the fertilizer slow-release blocks are arranged on inner cavities of the inner rings, the fertilizer slow-release blocks comprise biodegradable plastics and fertilizer, and the fertilizer is wrapped in the biodegradable plastics. According to the stony desertification preventing system and the preventing method thereof, through the protective screens and the fixing rings, planting gaps for planting lawn and seedlings are defined so that the soil fertility and soil holding force of preventing soil stony desertification by means of planting can be enhanced.

The invention discloses a microwave mixer holder used with a rotating wave oven, comprising a supporter, a shaft sleeve, and an O-shaped ring arranged inside a round groove for containing the O-shaped ring between the upper part of the supporter and the shaft sleeve. The top surface of the O-shaped ring and the bottom surface of a concave bench in the upper part of the shaft sleeve are positioned at the same plane. The bottom surface of the O-shaped ring is positioned in the round groove for containing the O-shaped ring between the upper part of the supporter and the shaft sleeve. The O-shaped ring is in interference fit with the supporter and the shaft sleeve. The invention has the advantages that the shaft sleeve is in interference fit with the supporter via washers made of Teflon materials with good anti-wear performance and long service life, so that the partially-damaged joining piece can be changed alone, the material consumption is reduced, and the installation is convenient.

The invention relates to a casting forming device and method, in particular to a casting forming device and method of foamed aluminum prepared with a foaming method. The casting forming device comprises a foaming tank, a bottom plate, a mixing tank and a partition, wherein the bottom plate is removably arranged in the middle of the foaming tank; the mixing tank is vertically arranged on the upperpart of the bottom plate in a sleeving manner; the partition is removably arranged in the foaming tank; and the partition comprises an arc-shaped plate and a square plate, the square plate is connected with the bottom plate and the arc-shaped plate, and the partition is assembled with the bottom plate and the inner wall of the foaming tank so as to form a casting cavity. According to the casting forming device, a lost foam casting process in a casting process is adopted, so that the casting of the foamed aluminum without allowance and with precise forming can be realized.

The invention discloses an electronic medical record processing and filing method based on layout files, and belongs to the field of medical archives. According to an electronic medical record processing and filing method based on layout files, paperless management of electronic medical records can be realized, the use of paper medical records can be reduced, the manpower and storage costs of medical and health institutions are greatly reduced through paperless management, sharing and retrieval of medical records are facilitated, online storage and retrieval of layout electronic medical records by patients are facilitated, and the business collaboration ability among medical and health institutions is improved; meanwhile, through the arrangement of the entity decryption card, when electronic edition handwritten signatures are inconsistent, the self-destruction effect is achieved, the entity decryption card loses the effect, and therefore the situation that the electronic medical recordis tampered is effectively avoided, and the accuracy of the electronic medical record is effectively guaranteed; under the arrangement of the tracking and early warning system, the tracking and earlywarning of the electronic medical record on the health of the patient can be effectively ensured, and the condition delay caused by purchasing prescription medicines by the patient according to the previous medical record is effectively avoided.

The invention discloses a rotary position sensor, which belongs to the technical field of position sensing, and is characterized by comprising a front shell, a rear shell and a controller, the front shell comprises a base block, a cylinder part, a supporting block and two arc-shaped plates; the end face of the side, close to the rear shell, of the supporting block is fixedly connected with a convex fixed ruler. The bottom surface of the convex fixed ruler is connected with a concave sliding ruler in a sliding manner; a rotating body and a linkage body are embedded in the inner wall of the cylinder part; one end of the linkage body is joggled with the rotating body, the other end of the linkage body is fixedly connected with a screw rod, the outer wall of the screw rod is sleeved with a nut, and the outer wall of the screw rod is meshed with the inner wall of the nut; a round groove is formed in the end face of the side, away from the linkage body, of the nut, an L-shaped rod is movably connected into the round groove, and the top end of the L-shaped rod is fixedly connected with the concave sliding ruler. The device is mainly used for multi-gear rotary input or a multi-gear rotary switch, can freely and continuously rotate, is simple in structure, reliable in operation and accurate in measurement, and can effectively eliminate temperature influence so as to realize long-term use.

An environment-friendly toothbrush achieving synchronous tooth brushing and toothpaste squeezing comprises a brush handle and a brush head connected to one end of the brush handle. A sliding cavity isformed in the brush handle, a sliding opening is formed in the lower end of the sliding cavity, a fixing frame is arranged on the side, close to the sliding opening, of the tooth handle, a mounting groove is formed in the fixing frame, the sliding cavity is communicated with the mounting groove through the sliding opening, a rotating groove is formed in the end, away from the brush head, of the brush handle, the rotating groove and the sliding cavity are spaced through a fixed plate, a first mounting opening is formed in the bottom of the mounting groove, the rotating groove is communicated with the mounting groove through the first mounting opening, a rotating wheel is arranged in the rotating groove, a clamping groove is formed in one side of the rotating wheel, a first ratchet wheel isclamped in the clamping groove, and a first rotating rod is connected to one side of the first ratchet wheel. By means of the toothbrush, tooth brushing and toothpaste squeezing can be conducted synchronously, and thus time is saved for a user; the discharge quantity of toothpaste can be controlled to prevent toothpaste waste, and thus cost is reduced for the user; meanwhile, the brush head can be detached, which is beneficial to environmental protection.

The invention relates to a roller supporting roller for controlling edge shoulder shedding and peeling. The fatigue resistance of the supporting roller is greatly improved by comprehensively optimizing the roller profile curve of the supporting roller, especially the power function roller profile curve of the edge on the premise of not influencing the straightness of a rolling mill and the convexity control capability of a plate, so that the long-term use of the supporting roller is realized, the probability of shoulder shedding and peeling of the edge of the supporting roller of the rolling mill is effectively reduced, and the problems that due to shoulder shoulder shedding and peeling of the edge of the supporting roller, roller losses are serious, the production quality is reduced, andcost is increased for a long time are solved.

The invention relates to a cooling device generating a flat jet and a manufacturing method thereof, the cooling device is characterized in that an inner pipe and an outer pipe of the cooling device are eccentrically fixed through a positioning strip for forming a cavity between the inner pipe and the outer pipe, a slit is formed in the axial direction, the width of the slit can be regulated through a tightening bolt and a compression bolt, a flange is welded at the inlet end of the inner pipe for connecting with a cooling medium pipeline, a steel plate is welded at the outlet end for sealing, and the cooling device is further provided with an inner cavity pollution discharge port. An end plate is welded at the inlet end of the cavity between the inner pipe and the outer pipe and used for sealing, the outlet end of the cavity and the flange are sealed through the end plate, and pollution can be discharged out of the cavity between the inner pipe and the outer pipe. Two rows of tidy flow through holes are formed on the inner pipe, and a cooling medium enters into the inner pipe via the flange at the inlet end, and then flows into the cavity between the inner pipe and the outer pipe via the flow through holes and further forms flat jet via the slit for cooling the steel plate. The eccentric arrangement of the inner pipe and the outer pipe of the device can form multiple damping effects for the cooling medium, the slit enables the cooling medium to form the uniform flat jet in the width direction of a rolling line, and multiple reinforcing ribs are welded outside the outer pipe in the radial direction for preventing deformation.

The invention relates to a fixing device for parts combination. The device comprises a nut, a screw, and a fill layer. The nut is in threaded connection with a screw. The fill layer is arranged at the threaded connection part between the nut and the screw, and is seamlessly connected with the nut and the screw. Compared with the prior art, the device has the following advantages of: being secure and tight: as the filler can fully penetrate into the junction of parts, the close integration between the parts can be achieved, which do not become loose; being safe: as the prior art can not achieve the exact combination between the parts, and the accuracy can not meet the standardized requirements, the perfect combination of materials can be achieved after the addition of the filler, thus improving the machine performance and safety; and being durable: as the filler is completely in a close integration at the junction of parts, which plays the role of isolating the air, corrosion of the parts is prevented and long-term use of the parts is achieved.

The invention relates to a safe and energy-efficient cognitive D2D communication method. Small cell base stations and cognitive users conduct channel quality assessments respectively; establish a joint resource allocation model regarding wireless charging power and wireless charging time; and use an iterative optimization algorithm to calculate the optimal Resource allocation results; transmit radio frequency signals with optimal wireless charging power; cognitive users collect radio frequency signal energy within optimal wireless charging time; small cell base stations interfere with eavesdroppers with optimal wireless charging power, and cognitive users set their own maximum feasible transmit power, and conduct cognitive D2D communication. The invention is oriented to ultra-dense small cell networks. It utilizes cognitive radio technology to realize spectrum sharing and uses energy collection technology to wirelessly charge cognitive users. At the same time, it interferes with eavesdroppers through artificial noise, thereby achieving safe and energy-efficient recognition. Intelligent D2D communication can effectively improve spectrum efficiency, energy efficiency and physical layer security.