42results about How to "Guaranteed discharge effect" patented technology

The invention discloses an automatic extractor hood speed regulating control method based on image analysis and an automatic extractor hood speed regulating control system based on mage analysis. The control method specifically comprises the following steps: (1), by virtue of an image acquisition unit, collecting an oil fume image of the upper part of a gas stove at a fixed frequency f; (2), by virtue of an image processing unit, extracting edge information by taking frame difference image of the collected oil fume image and an oil fume-free background image as a signal source; (3), by virtue of a main controller, performing quantitative analysis by taking the edge information transmitted by the image processing unit as an image feature value, thereby obtaining a frequency signal required by a frequency conversion fan; and (4), by virtue of the frequency conversion fan, regulating the rotation speed according to the received frequency signal sent by the main controller. By virtue of an image analysis means, the concentration of oil fume generated by the gas stove is detected in real time, the rotation speed of the fan is regulated and closed-loop automatic control is realized.

The invention discloses an automatic broadcast sower for agricultural organic manure. Two sides of a vehicle box bottom plate are respectively connected with a vehicle box side plate; the vehicle box side plates on the two sides and the vehicle bottom plate form a vehicle box tank; the vehicle box side plates on the two sides are respectively provided with a row of material discharging holes which are correspondingly communicated with the vehicle box tank; the vehicle box side plates on the two sides are internally and respectively provided with one main rotating shaft which rotates in the material discharging holes; the main rotating shafts are respectively provided with a material discharging rotating wheel which revolves in the material discharging holes; the material discharging rotating wheels swing in the material discharging holes; the vehicle box bottom plate is further provided with one first groove which is correspondingly communicated with the vehicle box tank; two sides of the first groove are respectively provided with one rotational squeezing board; the squeezing boards on two sides are corresponding to the material discharging holes; the organic manure can further be thrown away by the rotation of the material discharging rotating wheels; therefore, the amount of labour can be further alleviated; and the problem that manual broadcast sowing of the organic manure causes uneven broadcast sowing is avoided.

The invention relates to the technical field of integrated circuit (IC: Integrated Circuit) electro-static discharge (ESD: Electro-Static Discharge) protection design in microelectronics and discloses a double-mode ESD protection I / O (Input / Output) circuit. The double-mode ESD protection I / O circuit is characterized in that a first-level protection circuit and a second-level protection circuit are collaboratively designed, an ESD high-current discharge path is provided, and meanwhile, comprehensive protection on a core circuit is realized through a bidirectional voltage clamp protection technology and protection on the ESD circuit is realized through a current limiting protection technology. The double-mode electro-static discharge protection I / O circuit of the invention can provide a targeted discharge path and targeted protection respectively for the two different discharge patterns: human body model discharge and electron gun model discharge.

The invention relates to a combined direct current chopper adjuster for pushing fish torpedo, which comprises a dual-quadrant direct current copper (3), a direct current motor for pushing fish torpedo; a super capacity group (4) for supplying the electric energy of limited navigation speed of fish torpedo and filtering the wave of bus voltage; a ascending direct current copper (27) for lifting the supplying voltage of said dual-quadrant direct copper and the direct current motor; and a pre-charging device (28) for limiting discharge current of accumulator group, the ascending copper circuit can improve the output voltage of said fish torpedo direct current pushing system, increase the instant output powder of motor, and lift the instant limited speed of fish torpedo, while in limited speed, the copper can control the accumulator group in constant-current discharge mode to effectively confirm the discharge ability of accumulator group. The invention can adjust the speed of fish torpedo in large range with improved shot range.

The invention discloses an agricultural processing device for dried fruit. The agricultural processing device for dried fruit is capable of quickly automatic treating each processing process of fruit,increasing processing efficiency and reducing labor intensity. In the invention, a conveyer belt is adopted for drying; an upper drying hot air jetting component and a lower drying hot air jetting component are arranged for simultaneously drying up and down; a temperature and humidity sensor is arranged for monitoring a drying condition; the upper drying hot air jetting component can be moved outof the conveyer belt in the manner of rotating, so that hot air with humidity reaching up to a threshold value can be discharged; thus, in the initial stage of drying, air flow in ultrahigh humidityis difficult to be discharged if hot air gathers under the upper drying hot air jetting component; the upper drying hot air jetting component can be moved out of the drying conveyer belt in the mannerof rotating, so that the discharging effect can be guaranteed; longitudinal oscillation and horizontal oscillation are adopted by a washing component of the agricultural processing device, so that cleaning effect is promoted and water removal after flushing is realized.

The invention aims to provide cement component powder grinding equipment, and aims to solve the problems existing in the prior art. The equipment comprises a rolling disc, a weight bearing disc, a weight bearing foundation and a rotary driver, wherein the rolling disc, the weight bearing disc, the weight bearing foundation and the rotary driver are sequentially arranged in a supporting frame in adownward stacked mode, and the rotary driver is connected with a gear pair and used for driving the grinding disc; the gear pair comprises a first gear ring and a second gear ring, wherein the first gear ring and the second gear ring mesh with each other in an oblique-teeth mode, the upper side of the first gear ring is connected with an adjusting device, and the lower side of the second gear ringis connected with a supporting device; and the lower surface of the grinding disc is provided with a rolling surface which is outwards stepped down in the radial direction, the upper surface of the weight bearing disc is provided with a weight bearing surface which is outwards stepped down in the radial direction, the rolling surface and the weight bearing surface are combined to form a powder grinding cavity, and the vertical height of the powder grinding cavity is gradually reduced from the center to the outside. According to the cement component powder grinding equipment, cement componentscan be fully ground in single equipment until the final required particle size is directly output, and meanwhile the particle size of produced objects is conveniently adjusted according to productionrequirements so that the equipment cost can be reduced, and economic benefits can be improved.

The invention discloses a combined DC-chop speed regulating device for electrically propelling submarine, comprising: a startup buffering circuit to limit discharging current of storage battery group as starting up; a boosting chop circuit to increase output voltage of four-quadrant DC chopper and rotating speed of propelling motor; a super capacitor group to provide the electric energy needed by limit navigational speed of tin fish and filter the voltage of bus line; two four-quadrant DC choppers to drive the DC propelling motor; a main circuit control unit to control the combined chopper group. The invention can effectively ensure discharging ability of the storage battery group and thus, on the heavy-current discharging condition, the storage battery group can effectively increase the limit navigational speed of the submarine.

The invention relates to the field of accumulated snow discharging equipment for deceleration strips, in particular to a deicing and snow-accumulation-preventing deceleration strip assembly. Pressingdevices are movably mounted on the two sides in a deceleration strip device main body; rotating rods are movably mounted on two sides in the deceleration strip device main body relative to the lower ends of the pressing devices; a scraping device is movably mounted at the temporal part of the deceleration strip device main body; a rotating shaft is arranged in the rotating rod; one side of the rotating rod penetrates through the interior of the scraping device; when the pressing devices move downwards, acting force can be applied to one side of the rotating rod, so that the other side of the rotating rod drives the scraping device to move upwards, snow covering the upper end of the deceleration strip device main body is scraped, the upper end of the scraping device is arranged to be in anacute angle shape, so that the scraped snow covers the upper end of the scraping device conveniently while the snow can be scraped more cleanly, and the efficiency of driving the snow to move downwards can be improved through bent wavy arrangement of the upper side of the scraping device.

The invention discloses a multipurpose top coal caving support with a coal dust removal function. A dust absorption mechanism is arranged at the lower end of a top beam, and external air can be drivenby a draught fan to enter an air inlet pipe, then filtered by a dust absorption bag and conveyed into an exhaust pipe, so that the dust content in the air is reduced, and dust removal and reducing are realized. A dust discharging mechanism is arranged on the face, facing one side of an air inlet pipe of the dust absorption bag, of every layer of dust removal filter screens, the dust discharging mechanisms can automatically discharge dust filtered on the dust removal filter screens, the dust discharging capacity is guaranteed, and the automatic dust discharging function is achieved. In the dust absorption process, the draught fan continuously works, a dust removal draught fan intermittently works so as to intermittently discharge the dust on the dust removal filter screens, the dust removal draught fan and the draught fan are arranged to enable the air speed in a dust discharging pipe to be at least 1.5 times larger than that in the dust absorption bag, and the dust discharge capacitycan be effectively improved.

The invention provides a sink-type dishwasher and a washing control method thereof. The sink-type dishwasher comprises a sink piece, a bowl basket, a water inlet assembly, a drainage assembly, a pressure detector and a controller; the sink piece is of a general cuboid structure with an open top and comprises a sink; the shape of the bowl basket is matched with that of the sink piece; the water inlet assembly is used for injecting cleaning water into the bowl basket; the drainage assembly is used for draining cleaning sewage in the bowl basket out; the pressure sensor is arranged correspondingly to the bowl basket and used for detecting water pressure in the blow basket; the controller is connected with the pressure sensor, the drainage assembly and the water inlet assembly separately and used for controlling the water inlet assembly to work when a cleaning process is executed, controlling the water outlet assembly to stop working when the water pressure in the bowl basket is within a preset water inlet pressure range, and controlling the drainage assembly to work after cleaning is completed and stop working after the water pressure in the bowl basket is within a preset drainage pressure range. Thus, water feeding and drainage of the sink-type dishwasher are accurately controlled.

The invention relates to the field of waste incineration, in particular to smoke treatment equipment for plastic combustion. The smoke treatment equipment for the plastic combustion comprises a combustion chamber, and further comprises a first fixing plate, a first motor, a first transmission shaft, a first fixing plate, a second fixing plate, a second motor, a second transmission shaft, a combustion device, a feeding body, a feeding channel, a dust removal opening, and a smoke exhaust device, wherein the first fixing plate is fixedly arranged behind the combustion chamber, the first motor isfixedly connected to the first fixing plate, the first transmission shaft is detachably connected to the first motor, the first fixing plate and the second fixing plate are fixedly arranged on the left side of the combustion chamber, the second motor is detachably connected to the upper surface of the second fixing plate, the second transmission shaft is detachably connected to the side surface ofthe second motor, the combustion device is arranged on the transmission shaft, the feeding body is fixedly arranged on the left side of the combustion chamber, the feeding channel is formed inside the feeding body, the dust removal opening is formed in the lower end of the front surface of the combustion chamber, and the smoke exhaust device is fixedly connected to the right side surface of the combustion chamber.

The invention discloses fireproof and explosion-proof combined fireworks which comprise a transmitting seat body (1), transmitting holes (2) of the transmitting seat body (1) and a fireproof cover plate (11). The transmitting seat (1) is made of light fireproof materials, a lead wire (3) is embedded in the transmitting seat body (1), the bottoms of the transmitting holes (2) are communicated with one another by the lead wire (3), inner barrels (8) are arranged in the transmitting holes (2), a lead hiding hole (4) is formed in the transmitting seat body (1), an ignition portion of the lead wire (3) is hidden in the lead hiding hole (4), the fireproof cover plate (11) is made of light fireproof materials, fireproof plugs (6) for the transmitting holes and a fireproof plug (5) for the lead hiding hole are formed in the fireproof cover plate (11), the fireproof cover plate (11) covers the transmitting seat body (1), the fireproof plugs (6) for the transmitting holes are inserted into the transmitting holes (2), and the fireproof plug (5) for the lead hiding hole is inserted into the lead hiding hole (4). The fireproof and explosion-proof combined fireworks have the advantages that the fireproof and explosion-proof combined fireworks are high in transmission precision and low in transmission powder usage, the transmitting holes are short, the manufacturing cost can be saved, the safety coefficient can be increased, the fireworks can be prevented from being ignited by external fire sources, and accordingly sympathetic detonation accidents can be completely eradicated during production, transportation and storage.

The invention discloses a lead-embedded firework launching base which comprises a launching base body (1) made of light materials and launching holes (2) of the launching base body (1). Leads (3) are embedded in the launching base body (1), the bottoms of the launching holes (2) are communicated through the leads (3), different connection modes are adopted by the leads (3) in the launching base body (1) according to different rules of firework launching, and the inner space of each launching hole (2) is an inverted cone with a small bottom and a large top. The lead-embedded firework launching base improves launching accuracy, reduces propellant dosage, lowers the height of the launching holes, saves manufacturing cost, improves a safety system, is rapid in setting-off rhythm, high in production efficiency, free of blaze phenomenon, environmentally friendly and various in launching form and saves energy.

The invention relates to a horizontal flow precipitation water collecting device, which comprises a device body and a water outlet ditch, wherein the device body is a cuboid structure, the water outlet ditch is arranged on the outer wall of the device body, a rectifying wall and a water collecting assembly are arranged in the device body, the water collecting assembly comprises a perforated watercollecting pipe, a water outlet pipe and a water outlet control gate, the perforated water collecting pipe is connected to one end of the water outlet pipe, the other end of the water outlet pipe extends into the water outlet ditch, the water outlet control gate is connected to the end, extending into the water outlet ditch, of the water outlet pipe through a pipeline, and a gap is formed in the connecting position of the pipeline and the water outlet pipe. Compared with the form of the water collecting groove, the device of the invention substantially reduces the water collecting area, so that the proportion of the effective precipitation area of the precipitation pond is large, and the load rate of the existing horizontal flow precipitation is obviously improved so as to improve the water production capacity of the system.

The invention relates to the technical field of integrated circuit (IC: Integrated Circuit) electro-static discharge (ESD: Electro-Static Discharge) protection design in microelectronics and discloses a double-mode ESD protection I / O (Input / Output) circuit. The double-mode ESD protection I / O circuit is characterized in that a first-level protection circuit and a second-level protection circuit are collaboratively designed, an ESD high-current discharge path is provided, and meanwhile, comprehensive protection on a core circuit is realized through a bidirectional voltage clamp protection technology and protection on the ESD circuit is realized through a current limiting protection technology. The double-mode electro-static discharge protection I / O circuit of the invention can provide a targeted discharge path and targeted protection respectively for the two different discharge patterns: human body model discharge and electron gun model discharge.

The invention relates to the technical field of sewage treatment equipment, in particular to an energy-saving and environment-friendly sewage treatment device and a using method thereof.The energy-saving and environment-friendly sewage treatment device comprises a device body, a reaction cavity is formed in the device body, a main rotating rod is arranged in the reaction cavity, a residue filtering plate is arranged on the outer side of the main rotating rod, a filtering net is arranged in the residue filtering plate, and a residue conveying pipe is arranged in the main rotating rod; a spiral rod is arranged on the inner side of a residue conveying pipe, a residue filtering plate is arranged on the outer side of a main rotating rod, and after the main rotating rod rotates, the residue filtering plate can be driven to stir sewage in a reaction cavity, so that the reaction efficiency of the sewage and a chemical reagent is improved, and impurities generated by reaction can be attached to the residue filtering plate through a filter screen in the residue filtering plate; after falling downwards, impurities can penetrate through the open groove to enter the slag conveying pipe in the main rotating rod, the main rotating rod rotates to drive the spiral rod to push the impurities on the slag conveying pipe, and finally the impurities are discharged outwards from the slag discharging channel, so that the effects of discharging the reaction impurities outwards in real time and improving the sewage treatment efficiency are achieved.

The invention discloses a toilet manure tank suitable for a rural environment. The manure tank includes a tank body, and the tank body is provided with a feeding port; the feeding port is provided with a sealing device for sealing the feeding port, and the sealing device includes a sealing cover; one side of the sealing cover is evenly provided with multiple second connecting blocks, and first connecting blocks matched with the second connecting blocks are installed on the side surface of the tank body and positioned on one side of the feeding port; the first connecting blocks and the second connecting blocks are connected through first hinge shafts; a fixing rubber cushion is installed at the periphery of the feeding port inside the tank body, and a moving rubber cushion matched with the fixing rubber cushion is installed on the upper surface of the sealing cover. According to the manure tank, through a booster pump, the interior of the sealed tank body can be pressurized, and under the action of pressure, manure can be discharged from the bottom and passes through a first output pipe, a second output pipe and an output connecting pipe to be discharged to a preset position; therefore, it is avoided that people are always in a stinky and dirty environment when cleaning.

The invention discloses fire clay for a firework inner cylinder. The fire clay is characterized by comprising yellow mud, potassium hyperchlorate, nitrate of potash, sulphur, hemp stalk charcoal and graphite powder, and comprising, by weight, 40-45 parts of the yellow mud, 5-10 parts of the potassium hyperchlorate, 20-25 parts of the nitrate of potash, 3-5 parts of the sulphur, 10-15 parts of thehemp stalk charcoal and 5-10 parts of the graphite powder. The components are simple, and preparation is easy. When the fire clay is positioned into a firework inner cylinder, fire inducing is not required. The manufacturing procedure of the firework inner cylinder is simplified, the displaying effect of the firework inner cylinder is guaranteed, higher safety and reliability are achieved.

The invention belongs to the technical field of carbon material processing, particularly relates to a roasting device for carbon material processing, and provides the following scheme aiming at the problem of poor roasting effect on activated carbon in the prior art. The roasting device comprises a heat preservation cylinder, a roasting cylinder is arranged in the heat preservation cylinder, an auxiliary cavity is formed between the inner wall of the heat preservation cylinder and the outer wall of the roasting cylinder, a plurality of heating pieces are fixed to the inner wall of the auxiliary cavity, sealing cover plates are arranged at the two ends of the heat preservation cylinder correspondingly, a fixing piece is rotatably connected to the middle position between the inner walls of the two ends of the roasting cylinder, one end of the fixing piece is in transmission connection with a driving motor, and a plurality of dispersing pieces are fixed to the circumferential outer wall of the fixing piece. The roasting cylinder shakes along with separation and impact of abutting plates with different lengths, so that activated carbon is prevented from adhering to the inner wall of the roasting cylinder, the anti-adhesion effect is improved through cooperation of shaking of the roasting cylinder and separation and impact of the abutting plates with different lengths, and the actual roasting effect is improved.

The invention discloses an agricultural processing device for dried fruit. The agricultural processing device for dried fruit is capable of quickly automatic treating each processing process of fruit,increasing processing efficiency and reducing labor intensity. In the invention, a conveyer belt is adopted for drying; an upper drying hot air jetting component and a lower drying hot air jetting component are arranged for simultaneously drying up and down; a temperature and humidity sensor is arranged for monitoring a drying condition; the upper drying hot air jetting component can be moved outof the conveyer belt in the manner of rotating, so that hot air with humidity reaching up to a threshold value can be discharged; thus, in the initial stage of drying, air flow in ultrahigh humidityis difficult to be discharged if hot air gathers under the upper drying hot air jetting component; the upper drying hot air jetting component can be moved out of the drying conveyer belt in the mannerof rotating, so that the discharging effect can be guaranteed; longitudinal oscillation and horizontal oscillation are adopted by a washing component of the agricultural processing device, so that cleaning effect is promoted and water removal after flushing is realized.

The invention relates to a discharging device, which comprises a conductive barrel, a current sensor, a container and a current equalizing part, a transformer is electrically connected with the ground through the conductive barrel, and the current of the transformer can be led into the ground through the conductive barrel and the conductive liquid by injecting the conductive liquid in the container into the conductive barrel, so that the discharging and voltage reduction operation is carried out on the transformer. Due to the fact that the flow equalizing part is arranged in the conductive barrel, when small-flow conductive liquid enters the conductive barrel, part of the conductive liquid is deposited above the flow equalizing part under the blocking effect of the flow equalizing part, and therefore the conductive liquid makes full contact with the conductive barrel. Furthermore, the conductive liquid flows downwards through a gap formed between the flow equalizing piece and the inner wall of the conductive barrel, and the conductive liquid flows downwards along the inner wall under the flow guide effect of the inner wall, so that the risk of flow cutoff when the flow of the conductive liquid is small is reduced, the conductive liquid can stably flow to the grounding terminal, the discharge effect of the conductive liquid is ensured, and the service life of the conductive barrel is prolonged. The use reliability of the discharging device is improved, and the safety of power transformation equipment such as a transformer is further improved.

Atmospheric and overpressure range hoods. The invention relates to a range hood, which has a shell, a smoke suction port, a blower fan, a smoke outlet, and a ventilation device for adjusting indoor air pressure. The invention proposes a new way to improve the efficiency of the range hood by balancing or increasing the air pressure in the kitchen when the range hood is working, that is, balancing or increasing the air volume in the kitchen. Make range hood technology no longer a matter of separate consideration and design.

The invention discloses a firework inner barrel improved structure. The firework inner barrel improved structure is characterized by comprising a barrel body (1) and an ignition explosive mud (2) filling an inner cavity of the barrel body, wherein the ignition explosive mud (2) is formed by mixing yellow mud with an ignition explosive, and a pyrotechnic explosive filling the barrel body (1) is ignited by virtue of burning of the ignition explosive mud. The firework inner barrel improved structure has the advantages that the structure is simple, an ignition fuse is not needed, the manufacturingprocess is simplified, the setting-off effect of the firework inner barrel is guaranteed, and the effects of being safer, more reliable and the like are achieved.

The invention discloses a steelmaking converter flue with an ash deposition prevention structure, and belongs to the technical field of converter flues, and the steelmaking converter flue is technically characterized by comprising a smoke exhaust pipe and a driving mechanism, spraying assemblies are arranged inside and outside the smoke exhaust pipe, filtering assemblies are arranged inside and outside the smoke exhaust pipe, eight supporting rods are mounted on the driving mechanism, and each supporting rod is provided with a dust deposition prevention structure. Four cleaning brush plates are installed on the eight supporting rods, the outer sides of the four cleaning brush plates make contact with the inner wall of a smoke exhaust pipe, the front section of the smoke exhaust pipe is in a V shape, and a collecting barrel communicating with the smoke exhaust pipe is installed on the outer side of the smoke exhaust pipe. According to the smoke exhaust pipe, dust particles in smoke can be conveniently filtered and discharged out of the smoke exhaust pipe, manual operation of workers is not needed in the whole process, meanwhile, the interior of the smoke exhaust pipe can be actively cleaned, the dust accumulation phenomenon is reduced, the smoke channel blocking phenomenon is not likely to happen, and the using effect of the smoke channel is guaranteed.

The invention discloses an intelligent automatic organic fertilizer spreading machine. Two sides of a carriage base plate are respectively connected to one carriage lateral plate. Two carriage lateralplates and the carriage base plate form a carriage groove. The carriage lateral plates are both provided with a row of discharge openings that are communicated with the carriage groove. Main rotationshafts that rotate in the discharge openings are arranged in the carriage lateral plates. Each main rotation shaft is provided with one discharge rotation wheel that rotates in one discharging opening; the discharge rotation wheel swings in the discharging opening; the carriage base plate is also provided with a first groove that is communicated with the carriage groove; two sides of the first groove are both provided with a rotation extrusion plate; two extrusion plates are corresponding to the discharge openings; an organic fertilizer can be sprayed out through the rotation of the dischargerotation wheels; the labor strength is reduced, and the uneven fertilizing caused by artificial operation is avoided.

The invention discloses a heating body for an instantaneous heatomg type water dispenser. The heating body comprises a metal substrate electric heating film 1, a thermistor 2, a flow channel plate 3, cooling fins 4 and the like. The heating body is characterized in that reinforcement ribs are machined on a metal substrate of the electric heating film; a flow channel is machined on the flow channel plate; the reinforcement ribs on the metal substrate of the electric heating film and the flow channel on the flow channel plate form an S-shaped cavity flow channel after assembly, the cross section of the flow channel is in two shapes, one shape is formed by the flow channel of the flow channel plate and the flat plate part of the electric heating film and is similar to a semicircle, the sectional area is 10-15 mm<2>, the other shape is formed by the flow channel of the flow channel plate and the reinforcement ribs of the electric heating film, the flow channel interval is 1-2 mm, the sectional area is 5-10 mm<2>, the water volume of the heating body is smaller than 30 mL, and the ratio of the water volume of the heating body to power is smaller than 15 mL / KW. The heating body for the instantaneous heating type water dispenser has the advantages that the reinforcement ribs are creatively arranged on the metal substrate of the electric heating film, the deformation problem of the electric heating film in the machining and using process is effectively solved, and therefore the temperature and flow controllability is effectively improved, and the optimal performance of the instantaneous heating type water dispenser can be achieved.

The invention discloses an automatic extractor hood speed regulating control method based on image analysis and an automatic extractor hood speed regulating control system based on mage analysis. The control method specifically comprises the following steps: (1), by virtue of an image acquisition unit, collecting an oil fume image of the upper part of a gas stove at a fixed frequency f; (2), by virtue of an image processing unit, extracting edge information by taking frame difference image of the collected oil fume image and an oil fume-free background image as a signal source; (3), by virtue of a main controller, performing quantitative analysis by taking the edge information transmitted by the image processing unit as an image feature value, thereby obtaining a frequency signal required by a frequency conversion fan; and (4), by virtue of the frequency conversion fan, regulating the rotation speed according to the received frequency signal sent by the main controller. By virtue of an image analysis means, the concentration of oil fume generated by the gas stove is detected in real time, the rotation speed of the fan is regulated and closed-loop automatic control is realized.