CN103521452A - Environment-friendly type composite grain scalping machine - Google Patents

Abstract

The invention discloses an environment-friendly compound grain cleaning machine, which comprises a multi-layer cylinder screen, a negative pressure wind separation dust removal device, an organic miscellaneous processing device and a bag dust removal device. The bag dust removal device includes a fan and a bag dust remover. The dedusting device is installed at the grain inlet and grain outlet, and the negative pressure air pipe is connected with the inlet pipeline of the bag filter. The environment-friendly composite grain cleaning machine of the present invention has the characteristics of high grain cleaning efficiency, clean grain, less dust, and environmental protection, and can clean organic light impurities to ensure the safety of stored grain.

Description

An environment-friendly compound grain cleaning machine

technical field

The invention relates to the field of grain processing, in particular to an environment-friendly grain cleaning machine combining a sieve drum and winnowing.

Background technique

Food crops such as wheat, corn, and grains need to be cleaned before they are stored in the warehouse. Usually, the grain contains large debris such as stones and straws that are larger than grain particles, and small debris such as crushed stones and broken grains that are smaller than grain particles. In addition, there are dust and organic impurities or light impurities that are basically the same size as grain particles, but lighter in weight, such as moldy grain particles, insect-eaten grain particles, etc. The above-mentioned impurities are removed from the raw materials by a cleaning machine to obtain clean finished grains, which is convenient for subsequent processing, and can also prevent hidden dangers such as flammable grains, grain mildew, and insects during storage.

The Chinese utility model patent "New Cylinder Grain Cleaner" published in 2002 with the application number 02232451.8 introduced a grain cleaner based on a circular sieve drum for rolling screening, including an inner sieve drum, a middle sieve drum and an outer sieve drum , the three screen cylinders are coaxially arranged on the screen cylinder frame at an inclination angle to form a whole. The rear end of the inclined screen cylinder is fixed on the support roller by the outer screen cylinder, and the front end drives the shaft of the screen cylinder to rotate through the transmission mechanism to realize The overall rotation of the sieve drum. In the process of cylinder sieve cleaning grain, different sieve cylinders are evenly distributed with meshes of different sizes on the circumference, so as to realize the cleaning of impurities of different sizes. Grain enters from the inner sieve cylinder, and then flows out from the outer sieve cylinder. The grain particles rub against each other under the tumbling action of the drum, so that the dust adhered to the surface of the grain falls during the tumbling, and is discharged from the small waste outlet provided outside the outer screen cylinder together with other small waste, and the large waste is separated by the inner cylinder , discharged from the impurity outlet provided at the front end of the screen cylinder.

The problem with this cleaning method is that the single sieve drum cleaning method is used, and the removal of dust is not thorough enough. In addition, small impurities and dust are directly discharged into the air, which is easy to cause dust and cause environmental pollution. In the follow-up improvement technology, there are also other equipments that adopt the compound cleaning method combining screen cylinder and winnowing. Reasonable, resulting in poor dust removal effect, and easy to cause greater environmental pollution. In addition, it is difficult to remove organic light impurities that have the same size as grain particles but have a lighter specific gravity, which brings hidden dangers to grain storage.

Contents of the invention

The invention proposes an environment-friendly compound grain cleaning scheme, which adopts the combination of winnowing and screening, and has the characteristics of high grain cleaning efficiency, clean grain obtained by cleaning, less dust, and environmental protection.

Concrete scheme of the present invention is:

An environment-friendly compound grain cleaning machine, including an inlet hopper, an outlet hopper, an impurity collection box, and a plurality of coaxial cylindrical screens with a low front and a high rear, and the multi-layer cylindrical screen can rotate around the central axis of the cylinder , the grain particles to be processed enter the inner sieve cylinder of the cylindrical sieve from the feeding hopper, and the impurities separated by the cylindrical sieve enter the impurity collection box, and the processed grain particles are output from the hopper through the outer sieve cylinder of the cylindrical sieve. In that: it also includes a bag dust removal device connected by pipelines, the bag dust removal device includes a fan and a bag filter, the inlet of the fan is connected to the outlet pipeline of the bag filter; the grain inlet and the grain outlet Negative pressure winnowing and dedusting devices are installed at all places, and the negative pressure air duct of the negative pressure winnowing and dedusting device is connected with the inlet pipeline of the bag filter.

In the above environment-friendly compound grain cleaning machine, the negative pressure winnowing and dedusting device at the grain inlet includes a receiving hopper and a negative pressure air duct. The receiving hopper contains an inclined hopper wall, and the outlet of the feeding hopper is facing the inclined hopper wall. On the upper edge of the upper edge of the hopper, the grain particles flowing out of the feed hopper flow down to the inner screen cylinder along the inclined hopper wall, and an air inlet is opened in the middle of the inclined hopper wall, and the negative pressure air pipe is vertically arranged at The position above the inclined bucket wall is facing the air inlet.

In the above environment-friendly composite grain cleaning machine, the negative pressure winnowing dust removal device at the grain discharge port includes a negative pressure air duct, the discharge hopper contains an inclined bucket wall, and the grain particles flowing out of the outer sieve cylinder flow along the inclined wall. The bucket wall flows downwards, and an air inlet is opened in the middle of the inclined bucket wall, and the negative pressure air pipe is vertically arranged above the inclined bucket wall at a position facing the air inlet.

In the above environment-friendly compound grain cleaning machine, the front portion of the cylinder screen is provided with a blowing pipe, and the outlet of the blowing pipe is arranged between the inner screen drum and the outer screen drum at the position where the grain in the outer screen drum flows out. The blowing direction of the blowing pipe is consistent with the inclination direction of the screen drum; the blowing pipe is connected with the outlet of the blower, and the pipeline between the blowing pipe and the blower is provided with an adjusting damper. the

In the above environment-friendly compound grain cleaning machine, a windshield is arranged on the frame at the rear end of the outer screen cylinder, the middle part of the windshield is facing the outlet of the blowing pipe, and a light miscellaneous collection box is arranged under the windshield; An exhaust pipe is arranged above the wind plate, and the exhaust pipe is connected with the inlet pipeline of the bag filter.

In the environment-friendly compound grain cleaning machine mentioned above, the light trash, large trash and small trash are all discharged by the corresponding closed-air discharge auger.

In the above-mentioned environment-friendly compound grain cleaning machine, the grain cleaning machine has a closed structure as a whole, leaving only air inlets, air outlets, grain imports and grain exports.

In the environment-friendly compound grain cleaning machine mentioned above, the pipeline at the outlet of the fan is divided into two, one is connected to the blowing pipe after adjusting the damper, and the other is directly discharged.

In the environment-friendly compound grain cleaning machine mentioned above, the bag filter is a pulse-jet bag filter, and the outlet pipeline of the fan is three parts, the first one is directly discharged, and the second one is connected to the blowing pipe after the damper is adjusted. , the third way is to input the gas into the high-pressure air bag of the bag filter itself after passing through the pressurization unit.

In the environment-friendly compound grain cleaning machine mentioned above, the size and/or density of the meshes on the outer screen cylinder increases sequentially from front to back along the axial direction of the screen cylinder.

The beneficial technical effect that the present invention has is as follows:

1. The present invention combines the traditional cylindrical sieve type grain cleaning machine with the bag filter, and only the clean air is discharged directly, which overcomes the deficiency that the traditional cleaning machine directly discharges the dust into the atmosphere, and improves the working environment. It reduces the harm to the health of the staff and has the characteristics of environmental protection; at the same time, the present invention can separately collect and pack the large, small, light and dust in the grain particles, which reduces the amount of manual labor and improves work efficiency.

2. The present invention is equipped with a negative pressure wind separation dust removal device at the feed port and the discharge port of the grain cleaning machine, which ensures the cleanliness of the output grain and does not cause dust; the negative pressure air separation dust removal device adopted is sufficient Using the mixed effect of negative pressure suction and grain gravity, the dust removal effect is good, the work efficiency is high, the required negative pressure suction is small, and the dust is sucked into the bag filter by negative pressure, reducing the pollution to the surrounding environment.

3. In the present invention, a blower pipe is installed at the front end of the cylindrical sieve to remove the light impurities that are difficult to separate from the cylindrical sieve and have the same size as the grain particles, which improves the output quality of the grain and reduces the risk of mildew of the stored grain , improve the safety of grain preservation, and the light miscellaneous can be directly used as feed for poultry and livestock, reducing waste.

4. In the present invention, the impurities in the impurity collection box are discharged by the closed-air discharge auger, which avoids dust and reduces the pollution to the working environment.

5. The fan outlet pipeline of the bag filter device of the present invention is divided into two or three, and the air flow is used twice, which simplifies the structure of the cleaning machine and reduces the production cost.

6. The grain cleaning machine of the present invention has a closed structure as a whole, leaving only air inlets, air outlets, grain inlets and grain outlets, which reduces the pollution of the surrounding environment during grain cleaning, and has the characteristics of environmental protection and cleanliness.

7. The meshes of the inner and outer sieve cylinders of the present invention are arranged non-uniformly, which adapts to the content of grain impurities in the sieve cylinder from front to back, and improves the efficiency.

the

Description of drawings:

Fig. 1 is a schematic diagram of the principle of traditional winnowing dust removal;

Fig. 2 is the principle schematic diagram of efficient winnowing and dedusting of the present invention;

Fig. 3 is a schematic diagram of the working principle of the environment-friendly compound grain cleaning machine of the present invention;

Fig. 4 is a schematic diagram of the working principle of the bag filter of the present invention;

Fig. 5 is a schematic diagram of the working principle of the pulse jet bag dust removal device of the present invention;

Fig. 6 is the structural representation of outer screen cylinder of the present invention;

Fig. 7 is a side view of the outer screen cylinder in Fig. 6 of the present invention;

The reference signs are as follows:

1—inlet hopper; 2—grain particles; 3—negative pressure air duct; 4—connecting hopper; 5—air inlet; 6—air flow; 11—inner sieve drum; 12—outer sieve drum; —Small miscellaneous collection box; 15—discharging auger; 16—2# negative pressure air duct; 17—blow pipe; 18—wind shield; 19—3# exhaust pipe; 20—negative pressure main pipe; 21—cloth bag Dust collector; 22—pressurization unit; 23—fan; 24—exhaust pipe; 25—adjustment damper; 31—backup roller; 32—front support frame; 33—screen drum shaft;

Detailed ways

The present invention is an improvement on the basis of the existing cylindrical sieve type grain cleaning machine, and the main improvements include the following parts:

1. Wind separation dust removal unit

The traditional winnowing dust removal adopts the vertical free fall of the grain, and the dust removal port of the winnowing equipment faces the falling grain, as shown in Figure 1, the grain particles 2 in the feed hopper 1 fall freely, in the direction perpendicular to the grain falling, A negative pressure air duct 3 is provided to suck away the dust in the grain, and an air inlet 5 is provided at the position where the feed hopper 1 faces the negative pressure air duct. This method causes incomplete dust cleaning due to the blocking effect in the falling of grain.

Wind separation dust removal device of the present invention is as shown in Figure 2: the outlet of feeding hopper 1 is flat shape, and grain particle 2 is laid on the inclined hopper wall of receiving hopper 4 with the mode of thin layer, is arranged in the middle of inclined hopper wall There is an air inlet 5, and a negative pressure air duct 3 is set directly above the air inlet 5. First, the grain particles 2 have been arranged in a uniform thin layer under the negative pressure air duct 3. Under the action of negative pressure suction and grain gravity In this way, a vortex will be formed on the inclined hopper wall, which will cause the thin layer of grain to roll, so as to achieve the effect of cleaning dust. At the same time, due to the negative pressure, a part of the dust in the feeding hopper 1 will be sucked into the negative pressure wind along with the airflow. Therefore, cleaning and dust removal can be realized under the condition of very small wind force, and the dust is sucked away by the negative pressure air pipe 3 to the dust collection device, which reduces the pollution to the environment.

As shown in Figure 2, the air inlet is a number of small holes arranged in an array, wherein the size of the small holes is smaller than the grain particles, and the angle between the slope of the inclined bucket wall and the horizontal direction is 45°-75°, preferably 60° °.

2. Composite grain cleaning method

As shown in Figure 3, the composite grain cleaning machine of the present invention mainly includes a screening unit, a winnowing dust removal unit, a blower organic impurity removal unit and a gas purification unit.

Wherein the screening unit includes a double-layer screen drum or multi-layer screen drum rotating around the central axis, including an inner screen drum 11 and an outer screen drum 12. The mesh of the inner screen drum 11 is larger than the size of the grain particles 2, and is mainly used to remove particles larger than the grain size. Large impurities in the particles 2, such as straw, stones, etc.; the mesh of the outer sieve cylinder 12 is smaller than the size of grain particles, and is mainly used to remove small impurities smaller than grain particles, such as gravel, grain debris, etc. The inner screen cylinder 11 and the outer screen cylinder 12 are coaxially arranged, and the front is low and the rear is high and coaxially arranged on the screen cylinder frame at an inclination angle. The rear end of the inclined screen cylinder is fixed on the rotatable support roller, and the front end is driven by the transmission mechanism. The rotating shaft 33 of the sieve cylinder realizes the high-speed rotation of the sieve cylinder, and then achieves the cleaning of impurities of different sizes. The large impurities and grains obtained after cleaning enter the respective collection devices through the large impurities outlet and the finished product outlet set at the front end of the screen cylinder respectively. The small miscellaneous then enters the small miscellaneous collecting box that outer sieve cylinder 12 bottoms are arranged. Both large and small impurities are discharged by the corresponding closed-air discharge auger.

For the sake of simplicity, this manual does not give the specific mechanism of the above-mentioned common knowledge, but only draws a schematic diagram of the inner screen drum 11 and the outer screen drum 12. For the specific structure, please refer to the Chinese utility model patent "New Type Cylinder Grain Cleaner".

When grain particles containing impurities first enter the inner sieve cylinder 11, under the rotation of the sieve cylinder, the large impurities remain in the inner sieve cylinder 11, and enter the large debris collection box set at the front end of the sieve cylinder along the inclination angle, and the rest of the grain and The small trash enters the outer screen drum 12 through the mesh of the inner screen drum 11, and the small trash enters the small trash collection box 14 along the screen mesh of the outer screen drum 12, and the grain particles 2 pass along the screen mesh of the outer screen drum. The inclination angle of 12 has entered grain discharge hopper 13. The small miscellaneous collection box 14 links with the air-closed discharge auger 15, which can avoid the environmental pollution caused in the small miscellaneous discharge.

The air separation dust removal unit is respectively provided with the inlet and outlet of the screening unit, as shown in Figure 3, the grain particles 2 to be processed mixed with large impurities, small impurities, and dust are transported to the feed hopper 1 by the conveyor belt, and pass through the feed hopper 1. After the flat outlet, lay flat on the inclined bucket wall of the receiving hopper 4, and an air inlet 5 is arranged in the middle of the inclined bucket wall, and a 1# negative pressure air duct 3 is arranged directly above the air inlet 5, and the grain particles 2 are placed under negative pressure. Under the action of suction and grain gravity, a vortex will be formed, which will cause the thin layer of grain to tumble, drive the dust to tumble and be sucked into the 1# negative pressure air duct 3, and the dust-removed grain particles will enter the inner sieve drum 11 for further processing. Filter by size.

Also on the grain discharge hopper 13 of the outer screen cylinder 12, a winnowing and dust removal unit is also set up. On the inclined side wall of the discharge hopper 13, there is an air inlet in the middle part of the inclined bucket wall, and the negative pressure air duct 16 is vertically arranged at the position facing the air inlet above the inclined bucket wall.

At the outlet and inlet of the sieve drum, air separation and dust removal units are respectively installed to further increase the dust removal effect, and through negative pressure work, the dust is sucked away, which can greatly reduce the pollution to the environment and reduce the labor intensity of workers. The device makes full use of the mixed effect of negative pressure suction and grain gravity, does not require much wind power, and has good dust removal effect and high work efficiency.

3. Organic miscellaneous treatment

The purpose of the air blowing organic impurity removal unit is to process some impurities that are the same size as the grain particles but have a lighter density. The outlet of the outlet is set between the inner sieve cylinder 11 and the outer sieve cylinder 12, at the grain discharge hopper 13, and is close to the bottom of the outer sieve cylinder 12, and the blowing direction of the blower pipe 17 is consistent with the inclination direction of the sieve cylinder; when the screened grain When passing through the inclination angle of the outer screen cylinder 12 and flowing into the hopper 13, under the action of the airflow of the blower pipe 13, the light organic impurities are blown up and blown to the rear end of the outer screen cylinder 12 in reverse along the inclination angle of the outer screen cylinder 12 , the frame at the rear end of the outer screen cylinder 12 is provided with a windshield 18, after the light miscellaneous objects collide with the windshield 18, they fall by gravity and enter the light miscellaneous collection box, and are discharged by the corresponding closed-air collection auger; The blowing air flow is discharged along the 3# exhaust pipe 19 arranged above the windshield 18 .

Organic impurities usually include impurities that are basically the same as grain scale but lighter than grain, such as moldy grain, straw, moth-eaten or irregular grain particles, which have passed through the dust removal unit and contain only a small amount of dust, which can be directly used for poultry , Livestock feed. In addition, by removing moldy and moth-eaten light impurities, the risk of mildew in grain storage is reduced, and the safety of grain storage is improved.

4. Bag dust removal device

As shown in Figure 3, 1# negative pressure air duct 3, 2# negative pressure air duct 16 and 3# exhaust duct 19 enter the negative pressure main pipe 20 arranged above the cleaning machine after being aggregated and discharged, and enter as shown in Figure 4 The gas cleaning unit shown.

The gas purification unit includes a bag filter 21, a fan 23 and connecting pipelines. Bag filter 21 is an air dust removal equipment commonly used in power plants, steel mills and other industrial fields. Its working principle is that the dusty air passes through multiple non-woven bags installed in the bag filter to absorb dust, and then is purified and discharged through the outlet. As shown in Figure 4, the inlet of the bag filter 21 is connected to the negative pressure main pipe 20 in Figure 3, the outlet of the bag filter 21 is connected to the input end of the fan 23, and the output end of the fan 23 is divided into two, one way is connected The exhaust pipe 24 directly discharges part of the purified air into the atmosphere, and the other path is connected to the blowing pipe 17 in Fig. 3 through the damper 25, so that the dirty air containing dust and other impurities flowing in from the negative pressure main pipe 20 will be exhausted. Bag dust collector 21 purifies, one part is used for blowing treatment of light impurities in grain, and the other part is directly discharged into the air. The clean air is discharged directly. In addition, an adjustable damper 25 is set in front of the blowing pipe 17 to facilitate the adjustment of the airflow pressure in production. According to the parameters of the grain, the appropriate damper parameters are selected through multiple debugging tests to ensure that the air flow of the blowing pipe 17 is just enough to Light miscellaneous blowing, but not to blow away the finished grain.

The bag filter 21 used in the above gas purification unit is a traditional mechanical rapping dust removal method. When the dust is full of the bag, the dust on the bag can be removed by mechanical rapping, and it will fall to the lower dust collection bag to realize Long-term dust removal work; for the bag filter that works in the pulse jet cleaning mode, it is necessary to provide a high-pressure air storage bag for the bag filter when working. The switch of the high-pressure gas storage bag is turned on in a time period, and the high-pressure gas blows the bag in a pulsed manner, shaking off the dust in the bag and falling to the lower dust collection bag, realizing long-term dust removal work.

For the bag filter that works in the pulse jet cleaning mode, the gas purification unit can adopt the working mode as shown in Figure 5. The air-flow from fan 23 outlets is divided into three paths, the first path is connected to the exhaust pipe 24 and directly discharges part of the air after purification into the atmosphere, the second path is connected to the blowing pipe 17 in Fig. 3 through the damper 25, and the third path passes through After the pressurization unit 22, the gas is input into the high-pressure air bag of the bag filter itself for dust removal of the bag filter. The reason why the third air flow is pressurized is that the air pressure of the high-pressure air bag used for soot blowing is relatively high. Only when a certain pressure is reached can the dust adsorbed on the bag filter be removed in a pulsed manner. The pressurization unit 22 can be realized by a pressurization blower or an air compressor. In this way, the exhausted air is all dust-removed clean air, which keeps the working environment clean. In addition, the structure of the cleaning machine is simplified and the production cost is reduced through the secondary utilization of the exhaust airflow.

The grain cleaning machine of the present invention has an airtight structure as a whole, and only has air inlets, air outlets, grain imports and exports, and impurities outlets, which can prevent environmental pollution caused by flying dust during the cleaning process.

Five, non-uniform mesh

As shown in Figures 6 and 7, the outer screen cylinder unit includes a rotating shaft 33, a front support frame 32, a support roller 31, and an outer screen cylinder 12. It is coaxially fixed, and the rear end of the outer screen cylinder 12 is fixed on three evenly distributed rotatable support rollers 31. In the figure, for the sake of simplicity, the inner screen cylinder 11 is omitted, and the transmission mechanism drives the rotating shaft 33 and the outer screen The cylinder 12 and the inner sieve cylinder 11 rotate at the same angular velocity to realize the separation of grain particles according to the scale.

In order to improve production efficiency, the meshes 34 on the outer screen drum 12 are non-uniformly arranged and divided into sections I, II, and III from front to back. The density and number of meshes 34 in each section are uniformly distributed, but the meshes in section I The sieve aperture of the sieve diameter <Ⅱ section is less than the sieve aperture of the Ⅲ section. This is mainly due to the movement of the grain from the back to the front and the separation of impurities. The impurity content is gradually reduced. Pore separation is more effective, and later with the reduction of impurities, the use of small hole separation can meet the requirements, and the use of this non-uniform structure can ensure higher efficiency. As shown in FIG. 4 , each different section of the outer sieve cylinder 12 corresponds to a different collection box 14 for small miscellaneous items, which are collected separately.

As a preferred method, the meshes 34 may also be of the same size, but the density of the meshes 34 from the front to the rear is unevenly distributed, and similar effects can also be achieved. Of course, it is also possible to adopt a method in which the density and the scale increase simultaneously from the front to the back.

In the present invention, by improving the above-mentioned air separation and dust removal unit, compound cleaning method, organic miscellaneous treatment, bag dust removal type dust treatment, non-uniform mesh, etc., the grain cleaning machine developed has high cleaning efficiency and high cleaning efficiency. The characteristics of clean food, less dust, and environmental protection meet the requirements of modern new agricultural development.

Claims (10)

1. the compound grain cleaner of environment-friendly type, comprise feed hopper (1), discharge bucket (13), impurity collecting box (14) and low early and high after, the drum sieve being obliquely installed, described drum sieve comprises coaxial setting, and the interior screen drum (11) that can rotate around central axis and outer screen drum (12), described pending grain (2) enters interior screen drum (11) by feed hopper (1), grain after processing is exported by discharge bucket (13) through outer screen drum (12), separated impurity enters impurity collecting box (14), it is characterized in that: also comprise the bag-type dust collector connecting by pipeline, described bag-type dust collector comprises blower fan (23) and sack cleaner (21), the import of described blower fan (23) connects with the export pipeline of sack cleaner (21), described grain charging aperture and grain discharging opening place are provided with negative pressure dust removal of pneumatic separation device, and the negative-pressure air duct of described negative pressure dust removal of pneumatic separation device (3,16) connects with the inlet ductwork of sack cleaner (21).

2. the compound grain cleaner of environment-friendly type according to claim 1, it is characterized in that: the negative pressure dust removal of pneumatic separation device of described grain charging aperture comprises receiving hopper (4), negative-pressure air duct (3), described receiving hopper (4) contains an inclination headwall, the outlet of feed hopper (1) is over against the upper edge of described inclination headwall, the grain (2) that feed hopper (1) flows out flows downward to interior screen drum (11) along described inclination headwall, at the middle part of described inclination headwall, have air inlet (5), described negative-pressure air duct (3) is vertically set on inclination headwall top over against the position of air inlet (5).

3. the compound grain cleaner of environment-friendly type according to claim 1, it is characterized in that: the negative pressure dust removal of pneumatic separation device of described grain discharging opening comprises negative-pressure air duct (16), described discharge bucket (13) contains an inclination headwall, the grain that outer screen drum (12) flows out flows downward along described inclination headwall, at the middle part of inclination headwall, have air inlet (5), described negative-pressure air duct (16) is vertically set on inclination headwall top over against the position of air inlet (5).

4. according to one of any described compound grain cleaner of environment-friendly type of claim 1-3, it is characterized in that: the front portion of described drum sieve is provided with blower (17), the outlet of described blower (17) is arranged on the position of flowing out over against the interior grain of outer screen drum (12) between interior screen drum (11) and outer screen drum (12), and the blowing direction of described blower (17) is consistent with the incline direction of screen drum; Described blower (17) connects with the outlet of blower fan (23), on the pipeline between described blower (17) and blower fan (23), is provided with damper (25).

5. the compound grain cleaner of environment-friendly type according to claim 4, it is characterized in that: in the frame of described outer screen drum (12) rear end, be provided with deep bead (18), described deep bead (18) middle part is over against the outlet of blower (17), and the below of deep bead (18) is provided with light assorted collecting box; The top of deep bead (18) is provided with exhaust duct (19), and described exhaust duct (19) connects with the inlet ductwork of sack cleaner (21).

6. the compound grain cleaner of environment-friendly type according to claim 5, is characterized in that: described is light assorted, assorted greatly and little assorted by corresponding wind closing type discharge auger discharge.

7. the compound grain cleaner of environment-friendly type according to claim 1, is characterized in that: described grain cleaner is whole for closed structure, only leaves air inlet, air outlet, food import and grain-export.

8. the compound grain cleaner of environment-friendly type according to claim 4, is characterized in that: the pipeline of described blower fan (23) the outlet ，Yi road that is divided into two connects blower (17) after damper (25), and directly discharge on another road.

9. the compound grain cleaner of environment-friendly type according to claim 4, it is characterized in that: described sack cleaner (21) is pulse blowing type sack cleaner, the pipeline portion of described blower fan (23) outlet is three, the first via is directly discharged, the second tunnel connects blower (17) after damper (25), Third Road, after presser unit (22), is inputted gas into the high pressure gas bag of sack cleaner (21) self.

10. the compound grain cleaner of environment-friendly type according to claim 4, is characterized in that: yardstick and/or the density of the upper mesh (34) of described outer screen drum (12) increase from front to back successively along screen drum axis direction.

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