66 results about "Grain elevator" patented technology

The invention discloses an anti-blocking control system and control method for a grain elevator and grain drying equipment, the anti-blocking control system comprises a first rotating speed detection device and a control device, the first rotating speed detection device is used for detecting the rotating speed of the elevator, and the control device is in signal connection with the first rotating speed detection device and a grain stirring wheel. And the control device is configured to control and reduce the rotating speed of the grain stirring wheel under the condition that the rotating speed of the elevator is determined to be reduced according to the detection result of the first rotating speed detection device, so that unsmooth conveying at the elevator can be relieved or avoided until the conveying returns to normal, the subsequent blockage phenomenon can be avoided without increasing the structure of the elevator, and the production efficiency is improved. The purpose of avoiding cost increase is achieved.

The present invention relates to the technical field of elevators, and more specifically, to a grain elevator based on modern agricultural machinery and equipment, comprising a base, an elevator structure, a drive structure, a feeding structure, a rotating structure, and an opening and closing structure. The setting of the feeding structure avoids the blockage problem caused by excessive accumulation of grain at the elevator feed port, making the grain distribution more uniform, while facilitating operators to add grain to the equipment and improving flexibility. The setting of the rotating structure facilitates rapid adjustment of the direction of the discharge pipe on the elevator, thereby facilitating the delivery of grain to grain storage tanks in different directions, avoiding the adjustment of the overall direction of the elevator and improving operational efficiency. The setting of the opening and closing structure can flexibly adjust the valve opening according to production needs, accurately control the discharge flow of materials such as grain, and quickly cut off the discharge, with strong flexibility.

A conveyor over-limit loading recovery device comprises a grain elevator, a grain elevator pipe, a walking track and a walking trolley, the conveyor is obliquely arranged on one side of a compartment of a grain transport vehicle, the grain elevator is fixedly installed on the conveyor through a supporting frame, and the walking track is fixed to the side face of the grain elevator in the mode of being parallel to the horizontal plane. The walking trolley is arranged on the walking track; the grain suction pipe is composed of a hose and a stainless steel pipe, one end of the hose is connected with a material suction opening of the grain elevator, the other end of the hose is in butt joint with one end of the stainless steel pipe, the other end of the stainless steel pipe is bent downwards and extends into a compartment of the grain transporting vehicle, and the stainless steel pipe is fixedly connected to the side face of the walking trolley. According to the over-limit loading and recycling device of the conveyor, the grain elevator and the walking track are directly arranged on the conveyor, and the grain elevator pipe is movably installed on the walking track through the walking trolley. The whole device is simple in structure, is arranged on the conveyor, and does not occupy extra volume space when not in use.

The utility model discloses a traction type grain elevator which comprises a traction machine box, a grain elevator mechanism, a negative pressure mechanism, a spiral material lifting machine and a grain storage bin, the grain elevator mechanism is arranged on one side of the traction machine box, the negative pressure mechanism is further arranged in the traction machine box and comprises a negative pressure bin, a grain outlet is formed in the bottom of the negative pressure bin, and the spiral material lifting machine is arranged in the grain storage bin. In addition, the spiral lifting mechanism is fixedly connected to the traction case, a grain inlet in the bottom of the spiral lifting mechanism corresponds to a grain outlet, a grain storage bin is further rotationally connected to the traction case, the grain storage bin corresponds to a grain discharge port of the spiral lifting mechanism, an overturning oil cylinder is rotationally connected to the traction case, and the overturning oil cylinder is connected with the spiral lifting mechanism. The overturning oil cylinder is rotationally connected with the grain storage bin, and a power shaft is rotationally connected to the traction machine box and is in power connection with the negative pressure mechanism and the spiral material lifting machine. The utility model relates to the technical field of grain elevators, and has the characteristics of quickening the production efficiency, being suitable for being used in small-scale farmlands, and being low in failure rate.

The utility model discloses a grain elevator with an adjusting function, which relates to the technical field of grain conveying and comprises a frame, a lifting mechanism is movably mounted on one side of the frame, a dust removal mechanism is mounted on the front side of the frame, and an input end of the dust removal mechanism is communicated with an output end of the frame and two sides of the lifting mechanism. By the adoption of the structure, after grains are added into the feeding hopper, the grains are guided to the feeding plate on the conveying belt through the discharging hopper, the first motor is started to drive the conveying belt to rotate in the mounting frame, the feeding plate moves in a reciprocating mode to achieve feeding, and the air cylinder is started in the feeding process; and the hinged frame is pushed to move up and down in a linkage mode, so that the conveying belt is driven to move up and down, the grain feeding height can be flexibly adjusted and matched, stability and convenience are achieved, the use convenience of the device is greatly improved through the design, the grain lifting process is more efficient and flexible, and different feeding requirements can be met.

The utility model provides a grain collecting device and a harvester. The grain collecting device comprises a grain granary, a grain elevator, a blanking channel, a grain suction fan and an air adjusting part used for adjusting the impurity removal air volume. Wherein the grain elevator conveys grains to the grain granary, the blanking channel is respectively connected with the grain elevator and the grain granary, and the grain suction fan is arranged above the blanking channel and used for removing impurities from the grains passing through the blanking channel; the grain suction fan comprises a fan shell, an air inlet shell connected with the fan shell, an impurity removal shell and an impeller mechanism. An air inlet formed in the top of the blanking channel is communicated with the air inlet shell; the air adjusting part comprises an air adjusting baffle, the air adjusting baffle is arranged between the discharging channel and the air inlet shell, and the air adjusting baffle adjusts the size of the air inlet to control the impurity discharging air volume. According to the grain collecting device and the harvester provided by the utility model, the grain collecting quality can be improved and the impurity rate of grains can be reduced by adjusting the impurity removal air volume, and meanwhile, the grains can be prevented from being discharged due to overlarge air volume.

The present invention relates to a self-propelled combine harvester (1) for receiving and processing harvested crop, wherein the combine harvester (1) comprises a grain elevator (12) for conveying a crop flow (900) from a cleaning device (10) of the combine harvester (1) to a grain tank (13) of the combine harvester (1). The combine harvester (1) comprises a bypass device (14) arranged on the grain elevator (12) for extracting a partial crop flow from the crop flow (900) conveyed by the grain elevator (12), wherein the bypass device (14) comprises an optical measuring device (19) for determining crop properties, in particular constituents, of the crop partial flow, and wherein the bypass device (14) comprises a capacitive measuring device (21) for determining crop properties of the crop partial flow.The combine harvester (1) is characterized in that the capacitive measuring device (21) is provided and configured to determine crop properties of the crop partial flow only when it is not possible to determine crop properties of the crop partial flow using the optical measuring device (19).

The invention relates to a grain lifting device and a harvester and relates to the field of grain lifting devices.The output shaft of a lifting gear box is fixedly provided with a lower combination connector, a grain lifting barrel comprises a grain lifting auger and a grain lifting barrel body, one end of the grain lifting barrel body is hinged to a grain lifting device end assembly, and one end of the grain lifting auger is fixedly provided with an upper combination connector; the other end of the grain lifting auger is rotationally connected with the other end of the grain lifting barrel; the combination upper connector is provided with a guide hole. The combination lower connector is provided with a guide column. Or the combination upper joint is provided with a guide column and the combination lower joint is provided with a guide hole; the guide holes are detachably connected with the guide columns in an inserted mode. The grain lifting auger and the lifting gear box are guided and connected in an inserted mode through the guide columns and the guide holes, so that the grain lifting auger and the lifting gear box are combined stably and easily, and clamping stagnation is not prone to occurring. The combined upper connector and the combined lower connector serve as additional parts and can be replaced after being abraded, and the situation that the grain lifting auger and the lifting gear box are collided due to repeated insertion and connection, and the service life of the grain lifting auger and the service life of the lifting gear box are affected is avoided.

The utility model relates to the field of grain conveying equipment, and discloses a grain elevator with a dust removal function, which comprises a bottom plate, the top of the upper side wall of the bottom plate is fixedly connected with a first support frame, the inside of the first support frame is connected with a feed hopper in a penetrating manner, and the top of the feed hopper is fixedly connected with a dust suction box; and the top of the dust suction box is fixedly connected with a first flow guide plate. By arranging the feeding hopper, the dust suction box, the suction pump and the triple pipe, the problems that normal working efficiency is affected, and the purity and taste of flour are reduced can be solved, when grains enter the feeding hopper, a large amount of dust can be generated due to flowing, impacting and the like of materials, at the moment, the suction pump is started, and the dust can be removed. The first connecting pipe is communicated with the square pipe, and a negative pressure area is formed in the middle of the feeding hopper, so that pollution of dust to other equipment and stored grains is effectively reduced, part abrasion caused by dust friction is reduced, and the service life of the equipment is prolonged.

The utility model provides a grain elevator, a grain conveying system and a harvester, and relates to the technical field of harvesters. According to the grain elevator provided by the invention, when the feeding quantity of the materials at the seed inlet of the inlet component is large or the materials are humid, the buffering section above the grain bottom auger can buffer the conveyed materials, so that the problems of material pushing and squeezing and over-high material compactness are solved; therefore, the problems that the materials are difficult to carry away and easy to block when conveyed by a chain harrow subsequently are solved.

The utility model relates to the technical field of agricultural machinery, in particular to a multipurpose grain lifting device and a harvester, which comprise a grain elevator, a cluster box, a grain recycling box and an adjusting device which are arranged on a machine frame, and a turnover mechanism is further arranged on the machine frame. One end of the turnover mechanism is hinged to the rack, the other end of the turnover mechanism is hinged to the grain recycling box, the turnover mechanism is used for driving the grain recycling box to turn over, and the grain recycling box can directly unload grains without passing through the discharging bin. On the basis of an existing dual-purpose grain lifting device, a grain unloading mode is newly added, the grain unloading speed is increased, and fast grain unloading is achieved so that time can be saved for rush harvesting.

The utility model discloses a cleaning mechanism for a grain elevator, which relates to the field of grain elevators, and comprises an elevator feeding cylinder, the inner wall of the elevator feeding cylinder is fixedly connected with a clamping block, the top of the elevator feeding cylinder is provided with a rotating rod, the outer wall of the rotating rod is provided with a limiting block, and the limiting block is fixedly connected with the clamping block. A screening box is installed on the inner wall of the elevator feeding cylinder, a screen is fixedly connected to the bottom of the screening box, the screening box is moved, clamped and installed on the inner wall of the elevator feeding cylinder and arranged on a clamping block, and a limiting block is rotated, so that the limiting block can rotate along the elevator feeding cylinder, the screening box is limited, and the screening effect is improved. Grain is poured into the feeding barrel of the elevator, soil and large impurities carried in the grain can be blocked and filtered under the action of the screen fixedly connected to the bottom of the screening box, and the effect of conveniently filtering and cleaning the soil and large impurity particles carried in the grain at the feeding barrel of the elevator is achieved.

The utility model discloses a husked rice separator with a pre-screening mechanism, which relates to the technical field of grain machinery and comprises a support, two opposite vibration screening boxes are movably mounted on the support in a matched manner, a feeding hopper is mounted on the support in a matched manner, a material distributing hopper is mounted on the support in a matched manner, and the material distributing hopper is connected with the vibration screening boxes in a matched manner. A grain elevator is further installed on the support in a matched mode, a rotating shaft is installed on one side of the support in a matched mode, a hinged installation base is installed on one side of the vibration screening box in a matched mode, a connecting rod is installed on the hinged installation base in a hinged mode, and an eccentric wheel is installed at one end of the connecting rod in a matched mode and installed on the rotating shaft in a matched mode. A pre-screening device is installed on the material distributing hopper in a matched mode. When the vibration screening device is used, materials to be screened are firstly pre-screened through the pre-screening device before entering the vibration screening box, the pre-screening device can screen out powdery impurities in the materials to be screened, and then the purity of the screened materials is improved.

The utility model provides an anti-blocking natural vibration type grain elevator, which relates to the technical field of grain conveying, and comprises an elevator shell, the upper end of one side of the elevator shell and the lower end of one side of the elevator shell are respectively provided with a discharge port and a feed port, and the upper end and the lower end of the inner surface of the elevator shell are respectively and rotatably connected with a driving wheel and a driven wheel. A transmission belt is arranged on the surface of the driving wheel and the surface of the driven wheel, through cooperation of the motor, the driving wheel, the smooth protruding block, the fixing rod, the spring and the connecting piece, the striking rod can be periodically ejected outwards and automatically reset to strike the hit plate to generate vibration, and the vibration generated by the hit plate can be transmitted to the multiple grain conveying boxes. The grain conveying box is arranged, so that grains stored in the grain conveying box are loosened due to vibration, the grains can be conveniently thrown out towards the discharging port in time, and the situation that residual grains are conveyed to the bottom end in the elevator shell to be accumulated, and blockage is caused is effectively avoided.

The invention discloses a granary grain elevator which comprises a rack, a chain conveying part arranged on the rack and a plurality of hoppers sequentially arranged along the conveying path of the chain conveying part. The conveying path of the chain conveying part is sequentially divided into a material taking section, a conveying section, a material discharging section and a rotating section. The hopper comprises a first hopper body and a second hopper body which are connected in an inserted mode, a containing cavity is formed between the inner bottom wall of the first hopper body and the outer bottom wall of the second hopper body, the second hopper body is provided with a through hole communicated with the containing cavity, and a movable sealing piece is arranged on the outer bottom wall of the second hopper body. Through cooperation of a special collecting cavity, active screening and fixed-point mechanical discharging, an impurity removal cycle of screening, collecting and discharging is formed in a continuous material lifting path, and therefore lifting and impurity removal integrated operation is achieved.

The utility model discloses a kind of excess material cleaning devices of vibrating grain elevator, it is related to the field of cleaning device, including support vertical pole, support foot support and moving wheel, the support foot support is welded in the lower end of support vertical pole, the moving wheel is movably installed in the lower end of support foot support, the upper end of support vertical pole is fixedly installed with top plate, the outer side of support vertical pole is provided with lifting plate, the upper end of lifting plate is fixedly installed with driving motor, the upper end of lifting plate is fixedly installed with connecting frame outside driving motor. The utility model can make rotating rotary disc to change the inclination angle of cleaning brush, lock connecting sphere after pressing disc is rotated into internal thread ring, ensure that cleaning brush can be closely attached to the curved surface or inclined angle of elevator conveying groove, solve the problem that the existing device sweeps many dead angles, ensure that the height of cleaning brush can be accurately adjusted to adapt to the excess material cleaning demand of different parts of grain elevator.

The invention belongs to the technical field of grain transportation equipment, particularly relates to a lifting device and method for rice storage, and aims to solve the problem that an existing grain lifting machine cannot meet rice lifting requirements under specific storage conditions. A first bend wheel and a second bend wheel are rotationally connected between the inner walls of the two sides of the bottom box through bearings. A traction wheel is rotationally connected between the inner walls of the two sides of the top box through bearings, a rotary pipe and a lifting pipe are fixedly connected between the top box and the bottom box, and the two pipelines communicate with the top box and the bottom box correspondingly; and the discharging box is fixedly connected to the lower side of the top box, and the discharging box communicates with the top box. According to the lifting device and method for rice storage, lifting operation of rice storage is achieved through the digging and conveying assembly, the whole process is continuous, the lifting and material taking requirements in the standing rice storage state are met, and the problems of frequent material taking and lifting and material taking under the condition that flowing type feeding storage cannot be achieved are solved.

The combine harvester comprises a grain cleaning section (2) and a grain elevator (3), the cleaning section comprising one or more clean grain augers (6) configured to deliver clean grains into the grain elevator. The harvester further comprises a rotatable drive axle (7) and a transmission system (8) coupled thereto so that the drive axle (7) drives the one or more augers (6) as well as the elevator (3). The transmission system (8) includes a reversible decoupler mechanism configured to decouple the one or more clean grain augers (6) from the drive axle (7) while not decoupling the elevator (3) from said drive axle (7). These features enable the method of the invention for removing a blockage from the grain elevator (3), by decoupling the one or more clean grain augers (6) and then activating the elevator (3) to remove the blockage, followed by the recoupling of the one or more augers (6).

The utility model provides an airing device for grain processing, which relates to the technical field of airing devices, and comprises a mounting plate, an airing assembly is arranged at the top of the mounting plate, a circulating device is arranged on one side of the top of the mounting plate, a ventilation device is arranged above one side of the airing assembly, and the ventilation device is arranged above the other side of the airing assembly. A feeding device is arranged at the bottom of one side of the airing assembly, and a vibrator is arranged at the top of the airing assembly. Grain is poured into the feeding hopper, enters the airing bin through the feeding port and slides into the feeding groove along with the surface of the collecting hopper, then the forward and reverse motor and the grain elevator are started through an external controller, the transmission shaft and the auger blade are driven to rotate after the forward and reverse motor is started, and the grain in the discharging groove is fed into the feeding pipe. And the grains are conveniently extracted by a grain elevator, fed to the upper part in the airing bin through the connecting pipe, and then slide into the feeding and discharging groove along with the multiple layers of sieve plates, so that the grains do not need to be turned over, and the labor is saved.

A system or method for using a Frequency-Modulated Continuous Wave (FMCW) radar system installed on a harvester for determining yield data, the system or method comprising locating the FMCW radar system on the exterior of a clean grain elevator housing in a fixed location such that a signal may be transmitted into the housing. The signal may be guided by a waveguide and reflected off a surface of a load or the one or more components where the distance to the load or the one or more components is related to one or more properties of the load. The FMCW radar system is configured to use the reflected signal to determine the one or more properties of the load.

A chain guide for a wall of a grain elevator of an agricultural vehicle. The chain guide includes an elongated body. A rib extends from a surface of the elongated body, the rib being configured to engage with a chain of the grain elevator. A mating surface is either formed on or in the body, and the mating surface is configured to be connected to the wall of the grain elevator.

The dust filtering device of the grain elevator comprises a grain distributing box and a dust removing mechanism, a grain conveying mechanism is fixedly arranged at the top end of the grain distributing box, a first supporting frame is fixedly arranged on the periphery of the lower end of the grain distributing box, and a second vibration motor is fixedly arranged on one side of the grain distributing box. A volute fan is fixedly arranged on one side of the dust removal mechanism, a first vibration motor is fixedly arranged on the other side of the dust removal mechanism, a dust removal pipe is fixedly arranged at the position, close to the lower end of the first vibration motor, of the other side of the dust removal mechanism, a collection box is arranged at the bottom end of the dust removal mechanism, and second supporting frames are fixedly arranged on the periphery of the lower end of the dust removal mechanism. The dust removal mechanism comprises a shell. The grain distribution box has the beneficial effects that most dust of grains can be stripped in front of a dust removal system through the grain distribution box, the device is provided with a quick disassembly structure, the filter screen can be disassembled and assembled without tools, and daily cleaning and maintenance are facilitated.

The utility model relates to the technical field of harvesting amount measurement of harvesters, in particular to an impulse yield measuring device for a combine harvester and a harvester. The impulse yield measuring device comprises a detection panel, a cantilever, an elastic piece, a detection circuit and a shell. The detection circuit is arranged in the shell and is used for detecting the deformation of the elastic piece; a mounting part is arranged on the shell and is used for mounting the impulse yield measuring device in the grain elevator; the elastic piece is suspended on the shell; one side, facing the coming direction of the grains, of the detection panel is an arc-shaped surface and is used for bearing the impact of the grains; the back of the detection panel is connected with one end of the cantilever, and the other end of the cantilever is connected with the surface of the elastic member. The detection panel adopts an arc-shaped surface, so that the impact of grains can be comprehensively received as much as possible; the cantilever is located on the back face of the detection panel and does not occupy the space of the bearing face of the detection panel, the space utilization rate of the detection panel is improved, impact force of grains can be better transmitted, and therefore the detection result is more accurate.

The utility model provides a grain lifting barrel, a lift conveyer and a harvester, and relates to the field of harvester components. The grain lifting barrel comprises a barrel body; the lifting device comprises a telescopic part connected with the barrel body and a driving part connected with the telescopic part, the telescopic part is provided with a plurality of connecting rods which are rotationally connected in sequence, and the driving part can drive the connecting rods to rotate so as to drive the barrel body to synchronously ascend and descend. According to the grain lifting barrel, the lifting device is arranged to control operation of the barrel body, the lifting device comprises the telescopic part and the driving part, the telescopic part is connected with the barrel body and composed of the connecting rods which are sequentially and rotationally connected, the driving part can drive the connecting rods to rotate, and then the connecting rods drive the barrel body to synchronously ascend and descend. In this way, the grain lifting barrel can be simply, conveniently and smoothly driven to operate, and the safety coefficient is high when the grain lifting barrel operates.

The invention discloses a high-speed Roots blower for a grain elevator, and belongs to the technical field of fluid machinery. In order to solve the problems that an existing fan is disordered in air inlet, lagged in exhaust adjustment, insufficient in heat dissipation and the like, an air inlet rectification assembly (comprising a honeycomb grid and a spiral flow deflector) is arranged to optimize airflow, an exhaust adjustment assembly (adjustable blades and a parallelogram linkage mechanism) is arranged to achieve precise exhaust, and a liquid cooling assembly (an oil cooler and a circulating pump) is forcibly cooled; and a labyrinth sealing system, an axial positioning system and an intelligent temperature control system are integrated. The air inlet efficiency, the adjusting precision and the heat dissipation performance can be improved, and high-speed stable operation is guaranteed. The pneumatic conveying device is suitable for pneumatic conveying of the grain elevator and has the characteristics of high efficiency and high reliability.

The present invention belongs to the technical field of grain transportation equipment, and in particular, to a lifting device and method for rice storage. In view of the fact that existing grain elevators cannot meet the rice lifting needs under specific storage conditions, the following scheme is proposed, including a bottom box, wherein a first and a second redirecting wheel are rotatably connected between the inner walls of the bottom box on both sides via bearings; a top box, wherein a traction wheel is rotatably connected between the inner walls of the top box on both sides via bearings, and a rotary pipe and a lifting pipe are fixedly connected between the top box and the bottom box, and the two pipes are respectively connected to the top box and the bottom box; and a lower box, wherein the lower box is fixedly connected to the lower side of the top box, and the lower box is connected to the top box. The present invention discloses a lifting device and method for rice storage, which adopts a digging and conveying assembly to realize the lifting operation of rice storage. The entire process is continuous and meets the lifting and material taking needs under the static rice storage state, solving the problem of frequent material taking and lifting and material taking under the condition of non-mobile feeding storage.

The invention discloses a kidney bean picking harvester and a using method thereof. The problems that an existing harvester is large in kidney bean harvesting loss, poor in harvesting quality and insufficient in reliability are solved. According to the design scheme, a soil separating roller, a uniform distributor and a feeding roller are sequentially arranged between a pickup device and a threshing and separating device from front to back in the transverse direction, the soil separating roller is arranged at the rear end of an upper conveying face of the pickup device and attached to the front end of a lower shell of the uniform distributor, and the uniform distributor and the feeding roller are arranged from the low position to the high position. The middle section of the feeding roller corresponds to a feeding opening below the front end of the threshing and separating device, a grain elevator is vertically arranged on the side of the rear section of the cleaning sieve, the wind power impurity removing device is arranged above the rear section of the cleaning sieve, and the lower inlet end of an axial air suction pipe of a suction type high-pressure fan of the wind power impurity removing device covers the sieve surface of the rear section of the cleaning sieve. The device is suitable for picking and harvesting kidney beans.

The utility model discloses a grain monitoring device and a harvester, the grain monitoring device comprises a mounting shell and an image acquisition assembly, the mounting shell is erected on a grain elevator of the harvester and forms a mounting space with an image acquisition window, and the image acquisition window is located at one side of the mounting space close to a transmission surface of the grain elevator; the image acquisition assembly is arranged in the installation space and comprises a light source part and a high-speed camera, the light source part can emit visible light which illuminates an image acquisition window, a lens of the high-speed camera is arranged towards the image acquisition window, and the high-speed camera can move close to or away from the image acquisition window; according to the grain monitoring device, clear images of grains in a transportation state can be acquired, the image acquisition period is shortened, the timeliness of image analysis is improved, and the performance of the harvester can be judged more accurately and visually based on the acquired image information.

The utility model relates to the technical field of grain elevators, in particular to a grain elevator for grain drying, which comprises a bottom plate, an elevator body and a hopper, the elevator body is connected to the bottom plate, the elevator body comprises an input end and an output end, the input end is provided with an input frame, the bottom plate is connected with a support frame, and the hopper is connected to the support frame. The hopper is located above the input frame, a ventilation pipe is rotationally connected into the hopper, a plurality of air taps are connected to the ventilation pipe and evenly distributed in the length direction of the ventilation pipe, the ventilation pipe is externally connected with a hot air conveying device, a rotating mechanism used for driving the ventilation pipe to rotate is arranged on the hopper, and a discharging pipe is arranged at the bottom of the hopper. An auxiliary drying assembly used for drying grains is arranged on the discharging pipe, a dust collecting cover is connected to the discharging pipe, and a dust collecting assembly is arranged on the dust collecting cover. The grain pre-drying device has the effect of solving the problems that in the feeding process, pre-drying treatment on grains is difficult to achieve, and dust generated by the grains in the feeding process floats in the air.

The utility model belongs to the technical field of grain drying, and particularly relates to variable tempering circulation type grain drying equipment which comprises a grain feeding elevator, a drying machine body, a grain discharging auger and a heat source, and a grain feeding elevator grain inlet is formed in the lower end of the grain feeding elevator; the upper end of the drying machine main body is communicated with a grain outlet of the grain feeding elevator, the drying machine main body comprises at least two tempering sections and at least two drying sections which are alternately arranged up and down, and a grain discharging mechanism located at the bottommost end; a grain outlet auger is located under the grain discharging mechanism, and a grain outlet of the grain outlet auger is communicated with a grain inlet of the grain inlet elevator; the heat source provides hot air for the drying sections, and the variable drying and tempering ratio is achieved by controlling hot air supply of the different drying sections. A fixed drying tempering ratio is changed into a variable drying tempering ratio, the drying efficiency is improved, the drying time is shortened, meanwhile, it is guaranteed that the crack ratio is not increased, and the rice drying quality is guaranteed.