TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The drying chamber is provided with a lower air flow reduction chamber, a left drying chamber, airflow channel set on the right side of the drying chamber, and airflow channel set on the lower side of the drying chamber. The drying chamber is welded by an angle steel frame. A steel plate is used for forming a sealed square-shaped drying chamber. The square-shaped drying chamber provided with left and right steel plate is welded to the left and right side of the airflow channel by a screw. The upper and lower two sides of each airflow channel is provided with the steel plate. The airflow valve is made of axle-type bearing, where the air flow direction in each airflow valve changes. The airflow valve is used for changing the drying medium flow direction in the grain. The drying medium flow through a reverse valve varies with that of the air flow channel. The air flow channel is provided with a bridge-shaped hole made of steel. The air blows transversely into a V-shaped wind scattering steel plate located in the gap of the drying chamber containing grain. The one end of the first side of the V-shaped wind scattering steel plate is provided with the bridge-shaped hole, while the other side is provided with the airflow channel. The airflow channel with air flow changing valve evaporates water from the grain, where the waste gas containing water vapor is sucked by the machine body. The drying machine determines the size of the drying chamber, and the number of layers at the bottom part of the drying chamber, according to required production capacity. The specification parameters of the electric fan are set according to the size of the drying chamber capacity. The right side of the machine contains two groups of V-shaped wind scattering steel plate of which each group is connected with V-shaped wind dispersing plate provided with a balancer at the top. The V-shaped wind dispersing plate utilizes punched steel plate of the bridge-shaped hole. The other two surfaces of the drying chamber are provided with outer walls. The upper side of a wind scattering board is welded with a hook for hanging on the drying chamber. A transverse fixed angle of an iron frame is convenient to install and disassemble. The opening side of the V-shaped wind scattering steel plate is provided a gas flow inlet. The V-shaped wind scattering steel plate is connected to the balancer. The balancer is made of a steel plate, and is rectangular in shape. The chamfer angle of the steel plate and bent is 90 degrees . The top part of the V-shaped wind scattering steel plate is connected with a gas pressure wind adjusting unit, so that the internal pressure in the wind board is equal to the drying medium flowing in the grain gap with certain flow speed, to further achieve equal flow rate, and the grain drying time can be almost the same. The drying chamber is provided with a top cover, and the bottom part is provided with the air flow reduction chamber. The bottom part of the upper air flow reduction chamber is welded with many small quadrangular frames by angular iron. The upper part of each small square-shaped steel plate is fixed with a welded grain rectangular platform body. Each grain rectangular platform body is provided with a grain inlet branch pipe. The grain rectangular platform body is welded by a steel plate. A grain feeding branch pipe is rolled by a thin iron sheet. A grain inlet branch pipe is set on one end of a pump which is connected to a grain inlet. The flow of the grain is uniformly distributed in each grain inlet branch pipe. The top cover of the drying chamber is connected to the upper part of the air flow reduction chamber. The upper part of the air flow reduction chamber set in shell structure of the double-layered steel plate structure of the drier main body. The double-layered shell provided with steel plate screw is used for tightening the angle iron of the sealed upper frame having large spaced. The gas flow rate gets low when the gas line flows into the large spaced cross-sectional area, reduces the pressure of the gas, increases the flow of the static pressure, allows uniform air flow, and reduces the fluid resistance, and allows uniform distribution of the drying medium along the sides of the airflow passage and V-shaped wind scattering steel plate, and ensures equal flow rate of the absorbed drying medium in the grain, and equal speed of the dried grain during each precipitation process. The lower part of the drying room is connected to the upper part of the air flow reduction chamber. The angle frame is welded with many small square-shaped iron frames. The square frame is set with the grain rectangular platform body. The grain rectangular platform body is welded by the steel plate. The lower side of a four-prismatic table body is set with a grain discharging branch pipe. The grain outlet branch pipe is welded by steel plate. The lower edge of the grain discharging branch pipe is provided with an output power of the grain, where action includes drying the grain by conveying into the drying machine. The lower part of the air flow reduction chamber is built around with a double layered red brick wall body. The double-layered interlayer is filled with thermal insulation benzene plate. The wall towards one side of a heat exchanger is provided with a hole. The hole is used for heating the drying medium in the airflow channel. The left side end wall set with a multi-hole, and is equipped with a staff outlet made of plastic-steel door, which requires sealing, and two reserved windows are set on the wall to allow light to allow proper working conditions to the working staff during day light. The wall is a bearing wall of the drying chamber. The lower part of the flooring of the air flow reduction chamber is made of a thick steel plate which is hermetically welded. The middle part of the flooring is set with grain input machine for transporting the grain after drying out. The space below the ground of the drier main body is provided with the waste heat recovery and smoke-dust purifying chamber. The waste heat recycling and smoke-dust purifying chamber are surrounded by brick stone wall body, and also the drier main body is made of bearing walls. The flue gas temperature is relatively high when the smoke draft fan of the hot gas furnace absorbs the smoke. The flue gas smoke absorbed by the fan is blown into the underground small area of a pipeline, where the cross-sectional area increases when the smoke is flown onto the underground space area, and reduces the flow of the flue gas. The smoke dust in the flue gas speed is less than the suspending speed. The smoke drops into the bottom part of the smoke-dust purifying pool by the action of gravity, so as to achieve the flue gas purifying effect. The smoke in the relatively hot part floats on the upper side. The heat in the steel plate is transmitted to a fire pit set at the lower part of the air flow reduction chamber containing the drying medium, where the temperature of the drying medium is further increased, and makes complete use of the waste heat of the smoke, and saves energy. A wall recess is built at the lower part of the waste heat recovering and smoke-dust purifying chamber of a circular water tank. The bottom part of a water tank and the dryer main body is connected to the bottom part of a first sedimentation tank. A connector is set at a shallow channel set in depth to add some water. The smoke dust is sprayed back to the inner wall of the recessed circular water tank of the waste heat recycling and smoke-dust purifying room at a certain speed, when the smoke absorbing fan absorbs hot smoke dust, where the density of the smoke and dust is more than the smoke, and the inertia of smoke dust to fall into the water and after deposition to the drying machine main body to the bottom of the sedimentation tank, so as to achieve the purpose of waste heat recycling and smoke-dust purifying room. A control shaft is located at the center of the machine. The control shaft is provided with left and right upper and lower valves. A central control wheel shaft comprises a connecting rod connected with a valve. A central control wheel axle is made of circular steel and a universal joint. An air flow control valve comprises the steel plate of a bearing of a rotary shaft rocker arm. The connecting rod is made of a circular steel.