56results about How to "Realize automatic control adjustment" patented technology

The invention relates to the technical field of air conditioners, and provides an air conditioner and a humidification control method of the air conditioner. The air conditioner comprises an indoor unit, an outdoor unit, a water storage box, a humidifying body and a fan, the indoor unit is connected with an indoor unit drainage pipe, the outdoor unit is connected with an outdoor unit drainage pipe, the water storage box is communicated with the indoor unit drainage pipe and the outdoor unit drainage pipe, a heating rod is arranged in the water storage box, one part of the humidifying body is located in the water storage box and used for absorbing water in the water storage box, the other part of the humidifying body is located outside the water storage box, and the fan is used for supplying air from one side of the humidifying body to the other side of the humidifying body. According to the air conditioner, condensate water and defrosting water of the indoor unit and the outdoor unit can be collected to be used by a humidifying device, frequent water supplementing and adding are not needed, a user can conveniently use the humidifying function of the air conditioner, and the user experience feeling is improved. The rotating speed of the fan and the output power of the heating rod are controlled according to the current relative humidity, and automatic control and adjustment of the humidifying strength of the air conditioner are achieved.

The invention provides an automatic temperature control mold. The automatic temperature control mold comprises a fixed template, a movable template, a fixed mold core, a movable mold core and an ejecting device; the fixed template is connected with the fixed mold core; the movable template is connected with the movable mold core; a sprue is formed in the fixed template; a pouring runner is formed in the fixed mold core; the sprue is passed to the pouring runner; the ejecting device is connected with the movable mold core; a first liquid channel is formed in the fixed mold core; one end of the first liquid channel is connected with a first liquid inlet pipe, and the other end is connected with a first liquid outlet pipe; and the first liquid inlet pipe is connected to the first liquid outlet pipe through a valve module, a conveying pump and a hot liquid box in sequence. The automatic temperature control mold acquires the temperature of the mold through a temperature sensor, processes the acquired temperature data by a temperature control unit, controls rotation of a motor by a controller to move an ejector rod, controls the openness of a valve to enable the mold to locate in a set temperature range, realizes automatic temperature adjustment of the mold, and guarantees the product quality.

The invention discloses an adjusting device and an adjusting method for the injection flow rate of an evaporative cooling tower during dry converter dedusting and especially relates to control of the injection flow rate of an evaporative cooling tower during dry converter dedusting in the industries of metallurgy steel-making. The device comprises an electromagnetic flowmeter, a cooling water pressure detector, a cooling water pressure alarm instrument, a shut-off valve, a flow control valve, an evaporative cooling tower, an inlet temperature detector and an outlet temperature detector. The adjusting method comprises open loop control in an initial stage of converting and closed loop PID control when the temperature of flue gas tends to be stable. Open loop control realizes signal transmission mainly through connection of control signals of the electromagnetic flowmeter, the shut-off valve, the flow control valve and the outlet temperature detector with a PLC system to so as to allow water flow to vary with the temperature of flue gas, and therefore, water supply in the whole control process is balanced and the purpose of automatic control and adjustment of the injection flow rate is achieved.

The invention discloses an automatic control method and system for a powder feeding system. The method comprises the steps: the fluidization automatic adjustment of a powder bin is carried out, and the operation of a fluidizing device disposed on the powder bin is controlled according to the obtained wall surface pressure of the powder bin; and / or the pressure in a mixer is automatically adjusted, and the air flow entering a mixing chamber from the communicating position of an air phase pipeline and the mixing chamber is adjusted according to an average pressure value y in the mixing chamber of the mixer and the set outlet pressure range [a, b] of quantitative conveying equipment; and / or the conveying capacity of the quantitative conveying equipment is automatically adjusted, an optimal powder flow monitoring system on the mixer is determined according to the working frequency of the quantitative conveying equipment, and the working frequency of the quantitative conveying equipment is adjusted according to the powder flow Q monitored by the optimal powder flow monitoring system and the preset powder flow Q setting.

The invention belongs to the field of agricultural machine, and particularly relates to a tilling depth automatic control and adjustment device. The tilling depth automatic control and adjustment device comprises a mechanical unit and a control unit. The control unit comprises a first tilt angle sensor (6), a second tilt angle sensor (7), a rotary encoder (8) and a controller (9). The first tilt angle sensor (6) is arranged on a pull rod (2). The second tilt angle sensor (7) is arranged on a contour wheel frame (11). A rotating shaft of a contour wheel (3) is provided with the rotary encoder (8). An electric push rod (4), the first tilt angle sensor (6), the second tilt angle sensor (7) and the rotary encoder (8) are all electrically connected with the controller (9). The tilling depth automatic control and adjustment device is simple in structure, accurate in tilling depth adjustment and automatic in tilling depth control and adjustment. By means of the method of detecting the surfacerelief by the contour wheel and telescopically adjusting the tilling depth by the electric push rod, the tilling depth automatic control and adjustment are realized.

The invention discloses a shoe sole / shoe vamp polishing manipulator capable of automatically adjusting the polishing strength and angle. The manipulator comprises a mechanical arm for polishing a shoe sole, a polishing head installation plate arranged on the mechanical arm, and a driving device for driving the mechanical arm to move. The interior of the polishing head installation plate is of a hollow sealed cavity structure. The polishing head installation plate is provided with an air inlet and an air outlet, and a plurality of polishing heads of different polishing angles are installed on the two sides of the polishing head installation plate correspondingly. A polishing air bag cushion is fixedly arranged between each polishing head and the polishing head installation plate in a matched mode, and the polishing air bag cushions communicate with the cavity of the polishing head installation plate. The shoe sole / shoe vamp polishing manipulator can automatically polish the shoe sole or a shoe vamp, effective control over the control strength, the polishing angle and the polishing range of the polishing heads is automatically achieved, and the purposes of automatic adjustment, automatic polishing and automatic control are achieved.

The invention discloses pig culturing equipment capable of automatically controlling quantified feeding. The pig culturing equipment comprises a machine body and a charging bucket fixed on the top of the machine body, wherein supporting rods are fixed on the top of the machine body on the left and right sides of the feeding bucket; a feeding bucket is arranged on the top of each supporting rod; the inner sides of the feeding bucket extends toward the internal top part of the feeding bucket; a first cavity is disposed in the machine body; the edge of the bottom of the first cavity is provided with a projected spacing ring; the inner walls of the left and right sides of the first cavity close to the inferior are symmetrically provided with chutes; a movable member is slideably connected to the first cavity; a second cavity is formed in the internal top of the movable member; the top of the second cavity is slideably connected with a joining sleeve; the top of the joining sleeve is fixedly connected to the internal top wall of the first cavity; a third cavity is disposed in the joining sleeve; a communication port is formed in the machine body on the top of the third cavity; a first control valve is disposed in the communication port; and a tunnel-shaped cavity is placed in the movable member on the bottom of the second cavity. The pig culturing equipment capable of automatically controlling quantified feeding is simply structured, rationally designed, reduces forage waste and requires low manufacturing cost.

The invention provides an energy-saving optimal control method and system of an engine electric control silicone oil fan. The method comprises the following steps: vehicle operation environment data and engine internal operation data at the time k are acquired to build an overall operation state data set at the time k; a self-adaption dynamic planning system is built; self-adaption dynamic plan performance index functions at the time k, self-adaption plan efficiency functions at the time k and self-adaption dynamic plan performance index prediction functions at the time k+1 are calculated according to the overall operation state data set at the time k; the self-adaption dynamic planning system is dynamically optimized according to the performance index functions and the efficiency functions at the time k and the performance index prediction functions at the time k+1; iteration optimal control policies are obtained to output energy-saving optimal control signals to a silicone oil fan torealize dynamic energy-saving control of the rotating speed of the silicone oil fan; the self-adaption dynamic optimal adjustment of a controller is realized; the most optimal energy-saving control of the silicone oil fan is realized; and the life and the performance of an engine are effectively improved.

The invention relates to a method for monitoring distribution of internal tension of a continuous annealing horizontal furnace. Idle load of a furnace roller is measured and used as the load under zero output force; in the normal production, the actual load is compared with the idle load, and the difference is the load produced by the acting force of the roller and the strip steel; then load difference is converted into the level of acting force through calculation; and each furnace roller export tension is calculated successively by using the actual tension at the inlet as the benchmark. The method uses the load condition of each furnace roller to calculate the acting force of furnace roller on the strip steel, and uses the tension at the furnace inlet as the benchmark to calculate tension distribution of each point in the furnace. And the results are displayed on the screen, so that production personnel can clearly understand the tension distribution of the strip steel in the furnace, and take corresponding measures to regulate and achieve satisfactory tension distribution in the furnace.

The invention discloses a pig breeding equipment for automatically controlling the amount of feeding, which comprises a machine body and a feed hopper fixedly arranged on the top of the machine body. The top of the machine body on the left and right sides of the feed hopper is fixedly provided with support rods, and the top of the support rod is provided with feeding hoppers. The inner side of the hopper and the feeding hopper are all extended to the top of the feeding hopper. There is a first cavity in the body, and a protruding limit ring is provided at the bottom edge of the first cavity. The first cavity is close to the inner walls on the left and right sides below. There is a chute symmetrically arranged on the upper side, a movable piece connected by sliding fit is arranged in the first cavity, a second cavity is arranged on the inner top of the movable piece, and an engaging sleeve is connected to the top of the second cavity by sliding fit, and the top of the engaging sleeve is connected with the second cavity. The inner top wall of the first cavity is fixedly connected, and the third cavity is arranged in the joint sleeve, and a communication port is provided in the body on the top of the third cavity, and a first control valve is provided in the communication port, and the bottom of the second cavity is provided with a connecting port. The movable part is provided with a funnel-shaped cavity; the invention has simple structure, reasonable design, less feed waste and low manufacturing cost.

The invention relates to the field of chip drying equipment, and discloses a chip drying mechanism. The chip drying mechanism comprises a drying groove opened up; at least two separation plates, transversely distributed in parallel, are arranged in the drying groove; gaps are formed in the adjacent separation plates to form slots; cavities are formed in the separation plates; heat sources are mounted in the cavities; heat releasing holes communicating with the slots are formed in the walls of the cavities; and the separation plates are provided with fixing units for maintaining the distances from chip disc bodies to the separation plates. The chip drying mechanism can solve the quality of influence on the machining efficiency and the machining quality by difficult dissipation of water vapor due to a traditional laminate drying structure.

The invention relates to the technical field of beauty nourishment, in particular to a beauty freckle-removing food processing waste liquid recycling device which comprises a box-shell-shaped main box, the top of the main box is open, a waste liquid barrel is arranged in the main box, the waste liquid barrel is cylindrical, the bottom end of the barrel body is closed, and a plurality of evenly-distributed through holes are annularly formed in the barrel shell of the waste liquid barrel. The waste liquid barrel penetrates through the bottom plate of the main box, the bottom end of the waste liquid barrel is fixedly connected with an L-shaped pipe, and one end of the L-shaped pipe is fixedly connected with a supporting body. A high-quality filtering effect is achieved, after waste water in the waste liquid barrel is filtered, clear water flows into the main box, in the process that the clear water in the main box is discharged, the water level drops, buoyancy on a buoyancy ring is utilized to trigger lifting motion of an intercepting barrel, impact fluid is automatically generated in the intercepting barrel in the movement process and acts on the barrel net to impact residues attached to the outer wall of the barrel net so that the permeability of the barrel net is ensured, and preparation is made for the next filtering work of the barrel net.

The invention relates to the field of road roller devices, in particular to a vibration structure with an adjustable excitation direction. The vibration structure with the adjustable excitation direction comprises a vibration main body and an excitation cylinder arranged in the vibration main body, an eccentric shaft is arranged in a cylinder cavity of the excitation cylinder in the axial direction, an eccentric block group is arranged on the eccentric shaft, the eccentric shaft is connected with an external driving source and used for driving the eccentric shaft and the eccentric block groupto rotate, and the vibration structure further comprises an angle adjusting part used for adjusting the angle between the eccentric shaft in the excitation cylinder and the vertical direction by rotating the excitation cylinder so as to adjust the angle between the excitation force of the eccentric block group on the eccentric shaft and the vertical direction and to adjust the amplitude of the excitation force in the vertical direction; and the amplitude can be adjusted according to the compaction conditions, and the actual use need is met.

The invention discloses a mud stirring device with a cleaning function. The mud stirring device comprises a material box and a water box, wherein a hopper part is fixedly arranged at a top of the material box; a first accommodating cavity is formed in the material box; a projecting ring is arranged at a side part of a bottom of the first accommodating cavity; pushing-feeding grooves are symmetrically formed in inner walls of a left side and a right close to a lower part, of the first accommodating cavity; a flat slide element connected in a manner of flat slide fit is arranged in the first accommodating cavity; a second accommodating cavity is formed in a top in the flat slide element; a case is connected to a top of the second accommodating cavity in a manner of flat slide fit; a top of the case is fixedly connected with an inner top wall of the first accommodating cavity; a third accommodating cavity is formed in the case; an opening part is arranged in a part at a top of the third accommodating cavity, of the material box; a first sealing valve is arranged in the opening part; and a hopper-shaped cavity is formed in a part at a bottom of the second accommodating cavity, of the flat slide element. The mud stirring device disclosed by the invention is simple in structure, reasonable in design, capable of realizing automatic stirring and discharge simultaneously, and reducing mud waste, convenient to clean, capable of prolonging the service life, low in manufacturing cost, and capable of reducing labor and the labor intensity of workers.

The invention provides an intelligent variable frequency speed control device applicable to a pulse load. The intelligent variable frequency speed control device is characterized in that the input ofthe intelligent variable frequency speed control device is a single-phase alternating current, and the output of the same is a three-phase alternating current with adjustable frequency and voltage; the hardware circuit of the intelligent variable frequency speed control device is composed of a main circuit and a control circuit. The invention also provides a control method for the intelligent variable frequency speed control device applicable to the pulse load; the control method is characterized by being implemented through controlling the hardware circuit via software algorithm; and the software algorithm is composed of a main program and a sub-program. The control device and control method provided by the invention have the beneficial effects as follows: the intelligent variable frequency speed control device provided by the invention can achieve continuous frequency conversion, smooth in change of rotation speed, good in stability, low in production cost and high in performance cost ratio; and the control method provided by the invention can be popularized and applied to household appliances including three-phase asynchronous motors, can reduce the production cost of the household appliances, and has the wide commercial prospect.

The invention particularly relates to a mining spraying and dust settling device capable of automatically regulating an atomization grain size, solving the problems that when the existing spraying and dust settling device settles tiny dust, the dust settling efficiency is poor, and water resources are seriously wasted. A grain size adjusting nozzle comprises a barrel and a nozzle body, wherein a metal guide sleeve is arranged in the barrel, an electromagnetic coil is arranged outside the metal guide sleeve, a permanent magnet is arranged in the metal guide sleeve, the permanent magnet is connected with a push rod, the nozzle body is provided with a pressure sensor and a nozzle valve, a reset spring sleeves the push rod, output ends of a dust grain size sensor and the pressure sensor are connected with input ends of a central processor, an output end of the central processor is connected with an input end of an amplifier, and an output end of the amplifier is connected with input ends of a flow regulation electromagnetic valve and a pressure regulation electromagnetic valve, and the electromagnetic coil of the grain size adjusting nozzle. According to the mining spraying and dust settling device, automatic control and regulation for spraying and dust settling are realized, and real-time detection is performed on dust grain size.

The invention discloses an efficient paint blending device. The efficient paint blending device comprises a tank and a hopper fixedly arranged at the top of the tank and is characterized in that a support rod is fixedly arranged at the top, on each of the left side and the right side of the hopper, of the tank, a conveying part is arranged at the top of each support rod, the inner side of each conveying part extends towards the inner top of the hopper, the tank is provided with a first cavity inside, a protruding ring is arranged at the bottom edge of the first cavity, the left and right inner walls, close to the lower portion, of the first cavity are provided with corresponding slide grooves, a slide part in slidable matched connection is arranged in the first cavity, the inner top of the slide part is provided with a second cavity, a connecting pipe sleeve is slidably connected to the top of the second cavity in a matched manner, the top of the connecting pipe sleeve is fixedly connected with the inner top wall of the first cavity, the connecting pipe sleeve is provided with a third cavity inside, a connecting port is arranged in the tank at the top of the third cavity, a first switch valve is arranged in the connecting port, and a slide part at the bottom of the second cavity is provided with a conical cavity. The efficient paint blending device is simple in structure, reasonable in design, capable of achieving automatic stirring and discharging, capable of reducing paint waste, capable of increasing work efficiency and capable of reducing manpower and worker labor intensity.

The invention discloses an automobile signal lamp luminous intensity automatic control system and control method. The system comprises an environment information acquisition module, a vehicle state acquisition module, a data processing module and a signal lamp driving module. The method comprises the following steps: acquiring brightness information and vehicle speed information of the current environment of a vehicle through an environment information acquisition module and a vehicle state acquisition module; determining a light-emitting target brightness value of the vehicle signal lamp based on a light-emitting intensity control strategy of the vehicle signal lamp in the data processing module; and enabling the data processing module to send a control signal to the signal lamp driving module according to the automobile signal lamp light-emitting target brightness value to automatically adjust the automobile signal lamp light-emitting intensity. According to the control system and the control method, the luminous intensity of the automobile signal lamp is automatically set by recognizing the environment where the automobile is located, coordination of the luminous intensity of the automobile signal lamp, the automobile speed and the brightness of the surrounding environment is achieved, and the driving and riding safety is further improved.

A disclosed comprehensive utilization technology for a titanium dioxide by-product ferrous sulfate comprises the following steps: (1) sending ferrous sulfate heptahydrate to a ferrous-sulfate-heptahydrate charging belt machine by using a forklift, and crushing ferrous sulfate heptahydrate large particles by using a beating machine arranged at the outlet of the ferrous-sulfate-heptahydrate charging belt machine; (2) performing ore blending on pyrite, drying, sieving, and sending to a charging vibrator through the belt machine; and (3) sending the crushed ferrous sulfate heptahydrate to the charging vibrator through the belt machine, mixing with sieved pyrite, then sending to a fluidized bed boiler for roasting, and controlling the blending combustion amount of ferrous sulfate heptahydrate to be 30%-40%. The technology is mature and reliable in operation, high in operation efficiency and low in operation cost, helps to improve the usage amount of ferrous sulfate heptahydrate, and fully utilizes S and Fe resources in ferrous sulfate heptahydrate, wherein S and Fe resources play important roles. Also the technology establishes a base for the solution problem of waste slag in titanium dioxide industries, and has relatively good economic benefit and social benefit.

The invention discloses a differential three-roller roller press. The differential three-roller roller press comprises a rack, a driving device, a movable roller and a feeding device, and is characterized in that an upper pressing roller and a lower pressing roller are installed at the upper position and the lower position of the movable roller respectively, the movable roller is a driving roller, the driving device drives the movable roller to rotate, the upper pressing roller and the lower pressing roller are driven rollers, and the upper pressing roller and the lower pressing roller are driven by the movable roller and materials to extrude and grind powder. According to the differential three-roller roller press, the driving device drives the movable roller to realize single transmission, so that the power consumption is reduced; differential rolling grinding is adopted, and through the extrusion of the extrusion rollers on the materials and the shearing action among the materials, the one-time yield of grinding can be improved, and the rollers can be controlled not to be excessively abraded; the materials are extruded and sheared through the differential speed between the two rollers, and are rolled twice, so that the one-time yield is improved; and a hydraulic device and the movable roller are further arranged in a position-adjustable mounting mode, and a hydraulic cylinder is controlled to advance and retreat when necessary so as to impact and extrude materials by the movable roller.

The invention discloses a practical paint blending device which comprises a box body and a hopper bin fixedly arranged at the top of the box body, wherein support rods are fixedly arranged at the tops of the box body on a left side and a right side of the hopper bin; material conveying parts are arranged at tops of the support rods; inner sides of the material conveying parts extend to the top in the hopper bin; a first cavity is formed in the box body; a bump is arranged at a bottom edge of the first cavity; sliding grooves are corresponding formed in inner walls on the left side and the right side of the first cavity close to the lower part; a sliding piece connected in a sliding and matching manner is arranged in the first cavity; a second cavity is formed in the top inside the sliding piece; the top of the second cavity is connected with a connecting pipe sleeve in the sliding and matching manner; the top of the connecting pipe sleeve is fixedly connected with an inner top wall of the first cavity; a third cavity is formed in the connecting pipe sleeve; a communication port is formed in the box body at the top of the third cavity; a first switch valve is arranged in the communication port; a conical cavity is formed in the sliding piece at the bottom of the second cavity. The practical paint blending device provided by the invention has the advantages of simple structure and reasonable design, can realize automatic stirring and discharging, reduces waste of paint, improves working efficiency, and reduces labor force and labor intensity of workers.

An automatic adjustment method of speed synchronism of a casting machine and a rolling machine is characterized in that a weight sensor is installed on an upper approach bridge support between the casting machine and the rolling machine, the sensor is electrically communicated with programmable logic controller (PLC) automatic control system, the PLC automatic control system comprises a proportion integration differentiation (PID) closed-loop controller for adjusting speed of the rolling machine, the PID closed-loop controller produce a coefficient fro automatically correct the speed of the rolling machine, and a standard mid value when normal speed of the casting machine and the rolling machine synchronizes is set in the PLC automatic control system. The automatic adjustment method enables metal second flowing speed during continuous casting and rolling to be unchanged, automatically enables metal second flowing speed of the casting machine speed and the rolling machine speed to be synchronous, greatly improves product quality and achieves automatic control and adjustment of production speed.

The invention relates to an automatic adjustment device and adjustment method for the second throat of a converter, which belongs to the technical field of converter dust removal equipment and methods, and is used for automatic adjustment of the second throat of the converter. Its technical solution is: the present invention breaks through the traditional differential pressure control mode of the furnace mouth pressure sensor, adds a gas analyzer sensor, an oxygen analyzer sensor, an oxygen lance position sensor, and an oxygen regulating valve position sensor. The signal of the content and the position of the oxygen lance is the mark, and the throat hydraulic station is controlled by PLC. When the detection signals all meet the requirements of the conditions, the weight moves downward to the specified position. When any of the detection signals does not meet the conditions, the weight Go up and return to the initial position, so as to realize the automatic control and adjustment of the second throat of the converter. The invention is simple and practical, easy to maintain, safe and reliable, without cumbersome control procedures, effectively reduces the occurrence of accidents, greatly improves the gas recovery rate, and has remarkable economic benefits.

Disclosed is a large-span crystal palace dome system combining natural lighting and colored lamps. The large-span crystal palace dome system comprises a main dome body, an illumination system, a waterstorage and weight reduction system and projection systems; the illumination system comprises a lighting device and a lamp light device, the lighting device comprises a plurality of lighting holes formed in the top of the main dome body, and the lamp light device comprises a plurality of mounting holes circumferentially and evenly distributed in the inner circumferences of the lighting holes andthe colored lamps mounted in the mounting holes; the water storage and weight reduction system is embedded below the lighting holes and comprises a plurality of water storage devices with hollow interlayers, each water storage device is provided with a water inlet and a water outlet, and every two adjacent water storage devices are connected through a hose; the water storage devices are communicated with a water supply device, the water inlets and the water outlets of the water storage devices are communicated with a water supply pump and a water drainage pump respectively, and the projectionsystem is arranged in center holes of the water storage devices. The dome system can safely and stably meet the round-the-clock illumination requirements, the water storage and weight reduction systemreduces the bearing load of a dome, the projection systems conveniently achieve a static and dynamic imitation projection effect, and different crystal palace theme patterns are conveniently replacedat low cost by adopting colored drawing runner projection.

The invention discloses a fish tank which is convenient for changing water, which comprises a tank body and a water changing device installed at the bottom of the tank body. The left side of the water changing device is provided with a water inlet pipe and a water outlet pipe which are arranged in front and behind. Cavity, the two sides of the control chamber are oppositely provided with a first sliding joint groove and a second sliding joint groove, the left and right side walls of the first sliding joint groove are oppositely provided with water outlet holes connected with the water inlet pipe, and the left and right sides of the second sliding joint groove The wall is oppositely provided with a water inlet hole connected with the water outlet pipe, the water inlet hole and the water outlet hole are respectively provided with filter screens, the first sliding joint block is slidingly connected in the first sliding joint groove, and the second sliding joint groove is A second sliding block is slidably connected, the first sliding block is provided with a first communication hole for cooperating with the water outlet hole, and the second sliding block is provided with a second communication hole for cooperating with the water outlet pipe.

The invention provides a grain drying control system. The grain drying control system comprises an acquisition system, a processing control system and a driving display system, wherein the acquisition system comprises a sensor and an A / D converter which are connected in sequence, the processing control system comprises a clock device and a singlechip, the A / D converter is connected to the singlechip, the clock device is connected to the singlechip, the driving display system comprises a motor and an alarm apparatus, a PWM signal output module and an upper machine place, the alarm apparatus, wherein the PWM signal output module and the upper machine place are connected to the single chip respectively, and the PWM signal output module is connected to the motor. According to the grain drying control system, automatic control of grain drying can be achieved, the grain moisture content can be quickly and accurately measured, so that the grain drying system achieves low energy consumption and high efficiency.