Large impurity cleaning device and combined winnowing sieve

Abstract

The invention relates to a large impurity cleaning device and a combined winnowing sieve, the large impurity cleaning device is arranged below a feeding port of the combined winnowing sieve and in a feeding channel of a feeding hopper of the combined winnowing sieve, the large impurity cleaning device is provided with a screening part and an impurity stirring roller, the screening part is provided with a hinged end and a free end, the hinged end is hinged to the feeding hopper, and the free end is hinged to the feeding hopper. The free end of the screening part is in lap joint with a roller shaft of the impurity shifting roller, the screening part swings up and down around the hinged end through rotation of the impurity shifting roller, the screening part is provided with a screening area and an impurity removing area, the screening area can screen out large impurities such as rope heads, paper pieces, plastic cloth fragments and woven bag fragments in grain materials, and the impurity removing area is provided with a long-strip-shaped gap. The impurity shifting roller is provided with the impurity shifting part, the impurity shifting part penetrates through the gap of the impurity removing area, large impurities screened out of the screening area are shifted and discharged through the rotating impurity shifting part, the large impurities do not enter the screen box of the combined winnowing screen, the structure is simple, use is convenient, cost is low, and the large impurities entering the screen box can be effectively reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of grain screening equipment, and in particular relates to a large impurity cleaning device and a combined air separation screen for grain screening and impurity removal. Background Art

[0002] When grain materials are harvested, they will inevitably be mixed with impurities such as dust, husks, broken straw, gravel, rope ends, paper pieces, plastic cloth fragments, woven bag fragments, etc. When impurities are mixed with grain materials and put into storage, it is easy for the grain to heat up and mold, and it will also make the flow of grain in and out of the warehouse not smooth, especially for large grain warehouses. Large grain warehouses usually use tube chain conveyors for grain material in and out of the warehouse. Impurities such as rope ends, paper pieces, plastic cloth fragments, woven bag fragments, etc. are easily entangled in the conveyor chain plates of the tube chain, resulting in poor flow of grain in and out of the warehouse. Impurities such as gravel are also likely to increase equipment wear and affect the service life of the conveying equipment. For this reason, the grain needs to be screened, dusted and cleaned before it is put into storage to screen out impurities and some dust in the grain materials to ensure the smooth entry and exit of grain materials and the quality of grain materials. At present, there are various equipments for screening and dust removal of grain materials on the market, such as vibrating screen, flat rotary screen, combined air separation screen, etc. However, when the existing grain screening equipment is in use, the grain materials mixed with impurities enter from the feed port of the equipment and are directly spread on the upper screen. The upper screen usually has a larger aperture, and the impurities with larger particles such as broken straw and gravel with large diameter in the grain materials are retained on the upper screen and discharged from the large impurity outlet, while the grain materials and impurities with smaller particles fall from the mesh of the upper screen to the lower screen, and are further screened by the lower screen. However, in actual use, impurities with larger particles such as broken straw, gravel, rope ends, paper pieces, plastic cloth fragments, woven bag fragments, etc. are often stuck in the mesh of the upper screen, resulting in blockage of the mesh of the upper screen, causing some grain materials to be discharged from the large impurity outlet, affecting the screening quality and efficiency. Summary of the invention

[0003] In summary, in order to overcome the deficiencies of the prior art, the present invention provides a large impurity cleaning device, which is arranged below the feed port of the combined air separation screen, and is used to screen large impurities such as rope ends, paper pieces, plastic cloth fragments, and woven bag fragments in the grain material, and guide the large impurities to the auger for direct discharge without entering the screen box of the combined air separation screen. The device has a simple structure, is easy to use, and is low in cost, and can effectively reduce the large impurities from entering the screen box. At the same time, the present invention also provides a combined air separation screen with the large impurity cleaning device.

[0004] In order to solve the above technical problems, the technical solution of the large debris cleaning device provided by the present invention is implemented as follows: A large debris cleaning device, including: a screening element and a debris removal roller, The screening element is arranged obliquely downward along a first direction, and has a hinged end and a free end opposite to the hinged end. The first direction is the direction from the hinged end to the free end. Along the first direction, a screening area and a de-impurity area are sequentially arranged on the screening element. The screening area has densely arranged sieve holes. The de-impurity area is provided with long strip-shaped gaps densely arranged along a second direction. The second direction is a direction perpendicular to the first direction. A debris removing roller, wherein the debris removing roller has a rotatable roller shaft, the axis of the roller shaft is arranged along the second direction, the free end of the screening element is overlapped on the roller shaft, a debris removing piece is arranged on the roller shaft, the debris removing piece corresponds to the long strip gap in the debris removing zone of the screening element, and the debris removing piece passes through the long strip gap in the debris removing zone during the rotation of the roller shaft.

[0005] Preferably, the debris-clearing component is at least one row of debris-clearing rods provided on the roller shaft, the multiple rows of debris-clearing rods are arranged along the circumference of the roller shaft, each row of debris-clearing rods includes multiple debris-clearing rods, the multiple debris-clearing rods are arranged along the axial direction of the roller shaft, the length direction of the debris-clearing rods is perpendicular to the axis of the roller shaft, and the debris-clearing rods correspond to the long strip gaps in the debris-removing area of ​​the screening component.

[0006] Preferably, at least one rod is connected to the roller shaft, the axis of the rod is arranged parallel to the axis of the roller shaft, the multiple rods are evenly arranged along the circumference of the roller shaft, and the rotating roller shaft and the rod drive the screening element to swing around the hinged end of the screening element.

[0007] Preferably, the screening element comprises a sieve plate and a plurality of grate bars, one end of the sieve plate is a hinged end of the screening element, the end of the sieve plate opposite to the hinged end is a connecting end, the plurality of grate bars are connected to the connecting end of the sieve plate, and the plurality of grate bars are arranged along the second direction, and the gap is the space between two adjacent grate bars.

[0008] Preferably, one end of the grate bar is fixedly connected to the connecting end of the screen plate, the other end of the grate bar has a downward bending portion, the end of the grate bar opposite to the bending portion is fixedly connected to the bottom surface of the connecting end of the screen plate, the free end of the screening element is the end where the bending portion is located, and the grate bar is overlapped on the roller shaft of the cleaning roller, and the overlapping position is close to the bending portion.

[0009] The technical solution of the combined air separation screen provided by the present invention is achieved as follows: A combined winnowing screen, comprising: The screen box has a feed inlet, a clean grain outlet and a miscellaneous grain outlet. At least one layer of screen grids is arranged in the screen box. The screen box is suspended and connected to the frame through a suspension rod. The lower end of the suspension rod is connected to the screen box, and the upper end of the suspension rod is connected to the frame. The screening power device is connected to the screen box, and the screening power device drives the screen box to perform a planar rotary motion. A feed hopper, which has a feed port, a discharge port and a feed channel connecting the feed port and the discharge port, the discharge port of the feed hopper is connected with the feed port of the screen box through a flexible pipe, a large impurity cleaning device is arranged in the feed channel, the large impurity cleaning device is the above-mentioned large impurity cleaning device, the hinged end of the screening member of the large impurity cleaning device is hinged to the inner wall of the outer plate of the feed hopper, the inner plate of the feed hopper opposite to the outer plate is provided with a large impurity outlet connected with the feed channel, the free end of the screening member passes through the large impurity outlet from the inside to the outside, and the roller shaft of the impurity removing roller of the large impurity cleaning device is rotatably connected to the feed hopper.

[0010] Preferably, a magnetic separator is provided in the clean grain outlet of the screen box.

[0011] Preferably, it also includes an air selection device, which includes an air selection box, a light impurity separation cylinder, a fan, a vertical air suction channel and a return air channel. The feed hopper is arranged in the air separation box, and the feed hopper divides the inner cavity of the air separation box into a uniform air chamber located on one side of the feed hopper and an induced air settling chamber located on the other side of the feed hopper. The induced draft settling chamber is provided with a partition, the partition divides the inner cavity of the induced draft settling chamber into a large impurity settling chamber and a small impurity settling chamber, and the partition is provided with an air passage connecting the large impurity settling chamber and the small impurity settling chamber. The outer side of the air separation box is provided with a return air channel, one end of the return air channel is connected to the air uniforming chamber, and the other end of the return air channel is connected to the air outlet of the fan. The feed hopper is provided with an impurity removal air inlet connecting the uniform air chamber and the feed channel, the impurity removal air inlet is located below the large impurity cleaning device in the feed channel, the large impurity outlet of the feed hopper is connected to the large impurity settling chamber, the feed channel between the impurity removal air inlet and the large impurity outlet forms an air separation and impurity removal channel, the inner cavity size of the large impurity settling chamber is larger than the size of the air separation and impurity removal channel, The outside of the air separation box is provided with a large impurity pipe connected to the large impurity settling chamber and a small impurity pipe connected to the small impurity settling chamber, and both the large impurity pipe and the small impurity pipe have impurity outlets. The light impurity separation cylinder is arranged in the small impurity settling chamber, the air inlet of the light impurity separation cylinder is connected with the inner cavity of the small impurity settling chamber, the air outlet of the light impurity separation cylinder is connected with the air inlet of the fan, the air inlet of the fan is also connected with the upper end of the vertical suction channel, and the lower end of the vertical suction channel is connected to the atmosphere.

[0012] Preferably, the cross-sectional shapes of the large impurity settling chamber and the small impurity settling chamber are both V-shaped, a large impurity auger is arranged in the large impurity settling chamber, and a small impurity auger is arranged in the small impurity settling chamber, both the large impurity auger and the small impurity auger are connected to the impurity removal power device, and the impurity removal power device is also connected to the roller shaft of the impurity removing roller of the large impurity cleaning device.

[0013] Preferably, an air inlet adjustment mechanism is provided in the vertical air suction channel, and the air inlet adjustment mechanism includes an air inlet adjustment plate arranged in the vertical air suction channel and hinged to the side wall of the vertical air suction channel, and an operating handle for driving the air inlet adjustment plate to swing is provided on the outside of the vertical air suction channel.

[0014] Preferably, an air flow regulating mechanism is provided in the air flow passage, and the air flow regulating mechanism includes an air regulating plate provided in the air flow passage and hingedly connected to the air separation box, and an operating handle for driving the air regulating plate to rotate is provided on the outside of the air separation box.

[0015] Preferably, it also includes a material leveling hopper connected to the feed port of the feed hopper, the material leveling hopper has an upper opening, a lower opening and a material leveling channel connecting the upper opening and the lower opening, the lower opening of the material leveling hopper is connected to the feed port of the feed hopper, an adjustment plate hingedly connected to the material leveling hopper is provided in the material leveling channel, a material passing gap is provided between the adjustment plate and the side plate of the material leveling hopper, an adjustment handle for adjusting the material passing gap is provided on the outer side of the material leveling hopper, and the adjustment handle is connected to the hinge shaft of the adjustment plate and the material leveling hopper.

[0016] The beneficial effects of the present invention are: 1. The large impurity cleaning device of the present invention is arranged below the feed port of the combined air separation screen, and the grain materials and small impurities flow downward from the screen holes of the screening element. Large impurities such as rope ends, paper pieces, plastic cloth fragments, woven bag fragments, etc. in the grain materials flow obliquely downward along the screening element, and are then discharged under the sending action of the impurity removing element, which can effectively reduce the large impurities entering the screen box of the combined air separation screen and effectively prevent large impurities such as rope ends, paper pieces, plastic cloth fragments, woven bag fragments, etc. from clogging the screen grid in the screen box.

[0017] 2. A rod is connected to the roller shaft of the large impurity cleaning device of the present invention, and the free end of the screening element overlaps the roller shaft and contacts the rod. The rod rotates with the impurity cleaning roller, which can make the screening element swing up and down around its hinged end, so that food materials and small impurities can pass through the sieve holes smoothly, thereby improving the screening efficiency of the screening element and reducing the blockage of the sieve holes.

[0018] 3. The air separation device of the combined air separation screen of the present invention, under the action of the fan, the air flow entering the uniform air chamber enters the feeding channel in the feeding hopper through the impurity removal air inlet, the air flow flows in the direction from the impurity removal air inlet to the large impurity outlet, the grain material after being cleaned by the large impurity cleaning device flows downward along the feeding channel, the broken straw, dust and other light and fine impurities in the grain material are carried by the air flow and enter the large impurity settling chamber through the large impurity outlet, because the inner cavity size of the large impurity settling chamber is much larger than the size of the impurity removal channel, after the air flow enters the large impurity settling chamber, the large impurities carried in the air flow are discharged by the large impurity auger after settling, and then the air flow enters the small impurity settling chamber along the wind passage, and some of the small impurities carried in the air flow are settled in the small impurity settling chamber, and the air flow after impurity removal enters the light impurity separation cylinder, after the light impurities such as dust are removed under the action of the light impurity separation cylinder, under the action of the fans located on both sides of the light impurity separation cylinder, it enters the uniform air chamber again through the return air channels on both sides of the air separation box, so as to realize the circulation of the air flow.

[0019] 4. An air inlet regulating mechanism is arranged in the vertical air suction channel of the air separation box of the combined air separation screen of the present invention, and an air flow regulating mechanism is arranged in the air flow channel in the air separation box. The air volume can be adjusted by the air inlet regulating mechanism and the air flow regulating mechanism.

[0020] 5. The combined air separation screen of the present invention has a material mixing hopper connected to the feed hopper, and an adjusting plate is provided in the material mixing channel. After the grain material enters from the feed end of the material mixing hopper, the grain material is evenly dispersed under the action of the adjusting plate, so that the grain material can evenly enter the feed hopper, and then enter the screen box through the feed channel in the feed hopper for screening.

[0021] 6. A magnetic separator is provided in the clean grain outlet of the screen box of the combined air separation screen of the present invention. The iron filings impurities in the clean grain after screening and impurity removal by the sieve grid in the screen box are adsorbed and removed by the magnetic separator, which can effectively remove the iron filings impurities in the grain material and ensure the quality of the clean grain after screening and impurity removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the large debris cleaning device of the present invention; Figure 2 For the present invention Figure 1 A-direction structural schematic diagram; Figure 3 It is a schematic diagram of the structure of the combined air selection screen of the present invention; Figure 4 For the present invention Figure 3 Schematic diagram of the left view structure; Figure 5 It is a working principle diagram of the combined air separation screen of the present invention. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0024] like Figure 1 and Figure 2 As shown, a large impurity cleaning device comprises a screening element 1 and a cleaning roller 2. The screening element 1 is arranged obliquely downward along a first direction, and has a hinged end 3 and a free end 4 opposite to the hinged end 3. The first direction is the direction from the hinged end 3 to the free end 4. Along the first direction, a screening area 101 and a cleaning area 102 are sequentially arranged on the screening element 1. The screening area 101 has densely arranged sieve holes, and the cleaning area 102 has long strip gaps 103 densely arranged along a second direction. The second direction The direction is perpendicular to the first direction, the impurity removing roller 2 has a rotatable roller shaft 201, the axis of the roller shaft 201 is arranged along the second direction, the free end 4 of the screening element 1 is overlapped on the roller shaft 201, and the roller shaft 201 is provided with an impurity removing piece 202, the impurity removing piece 202 corresponds to the long strip gap 103 of the impurity removing area 102 of the screening element 1, and the impurity removing piece 202 rotates with the roller shaft 201, and the impurity removing piece 202 passes through the long strip gap 103 of the impurity removing area 102. In this embodiment, the impurity removing member 202 is four rows of impurity removing rods 203 arranged on the roller 201, and the four rows of impurity removing rods 203 are evenly arranged along the circumference of the roller 201, and each row of impurity removing rods 203 includes a plurality of impurity removing rods 203, and the plurality of impurity removing rods 203 are arranged at intervals along the axis direction of the roller 201, and the impurity removing member 202 corresponds to the long strip gap 103 of the impurity removing area 102 of the screening member 1, and the impurity removing member 202 passes through the long strip gap 103 of the impurity removing area 102 during the rotation of the roller 201. The length direction of the impurity removing rod 203 is perpendicular to the axis of the roller 201. Four rods 204 are fixedly connected to the roller shaft 201. The axes of the rods 204 are arranged parallel to the axis of the roller shaft 201. The four rods 204 are evenly arranged along the circumference of the roller shaft 201. The rotating roller shaft 201 and the rods 204 drive the screening element 1 to swing around the hinged end 3 of the screening element 1.

[0025] In this embodiment, the screening element 1 includes a screen plate 104 and a plurality of grate bars 105, one end of the screen plate 104 is the hinged end 3 of the screening element 1, the end of the screen plate 104 opposite to the hinged end 3 is the connecting end 106, the plurality of grate bars 105 are connected to the connecting end 106 of the screen plate 104, and the plurality of grate bars 105 are arranged along the second direction, the gap 103 is the gap between two adjacent grate bars 105, one end of the grate bar 105 is fixedly connected to the connecting end 106 of the screen plate 104, the other end of the grate bar 105 has a downward bending portion, the end of the grate bar 105 opposite to the bending portion is fixedly connected to the bottom surface of the connecting end 106 of the screen plate 104, the free end 4 of the screening element 1 is the end where the bending portion is located, the grate bar 105 is overlapped on the roller shaft 201 of the impurity removing roller 2, and the overlapping position is close to the bending portion.

[0026] like Figure 3 , Figure 4 and Figure 5 As shown, a combined air separation screen includes a frame 5, a suspension rod 6, a screen box 7, a screening power device 8, a feed hopper 9, an air separation device and a material leveling hopper 10. The feed hopper 9 has a feed port, a discharge port and a feed channel 901 connecting the feed port and the discharge port. The feed port of the feed hopper 9 is connected with the material leveling hopper 10. The material leveling hopper 10 has an upper opening, a lower opening and a material leveling channel 1001 connecting the upper opening and the lower opening. The lower opening of the material leveling hopper 10 is connected with the feed port of the feed hopper 9. An adjusting plate 1002 hingedly connected to the material leveling hopper 10 is arranged in the material leveling channel 1001. A material passing gap is arranged between the adjusting plate 1002 and the side plate of the material leveling hopper 10. An adjusting handle for adjusting the material passing gap is arranged on the outer side of the material leveling hopper 10. The adjusting handle and the adjusting plate 1002 are connected to the hinge shaft of the material leveling hopper 10. The discharge port of the feed hopper 9 is connected with the feed port of the screen box 7 through a flexible pipe 11. A large impurity cleaning device is arranged in the feed channel 901. The hinged end 3 of the screening member 1 of the large impurity cleaning device is hinged to the inner wall of the outer plate of the feed hopper 9. The inner plate of the feed hopper 9 opposite to the outer plate is provided with a large impurity outlet 902 connected with the feed channel 901. The free end 4 of the screening member 1 passes through the large impurity outlet 902 from the inside to the outside. The roller shaft 201 of the impurity removing roller 2 of the large impurity cleaning device is rotatably connected to the feed hopper 9.

[0027] The screen box 7 has a feed inlet, a clean grain outlet and a miscellaneous outlet. At least one layer of screen grids is arranged in the screen box 7. The screen box 7 is suspended and connected to the frame 5 through a suspension rod 6. The lower end of the suspension rod 6 is connected to the screen box 7, and the upper end of the suspension rod 6 is connected to the frame 5. A magnetic separator 17 is arranged in the clean grain outlet of the screen box 7. The screening power device 8 is connected to the screen box 7, and the screening power device 8 drives the screen box 7 to perform a planar rotary motion.

[0028] The air separation device includes an air separation box 12, a light impurity separation cylinder 131, a fan 13, a vertical suction channel 14 and a return air channel 15. The feed hopper 9 is arranged in the air separation box 12, and the feed hopper 9 divides the inner cavity of the air separation box 12 into a uniform wind chamber 121 located on one side of the feed hopper 9 and an induced draft settling chamber located on the other side of the feed hopper 9. A partition 124 is arranged in the induced draft settling chamber. The partition 124 divides the inner cavity of the induced draft settling chamber into a large impurity settling chamber 122 and a small impurity settling chamber 123. An air passage 125 connecting the large impurity settling chamber 122 and the small impurity settling chamber 123 is arranged on the partition 124. An air passage 125 is arranged in the air passage 125. The air passage regulating mechanism 129 includes an air regulating plate arranged in the air passage 125 and hingedly connected to the air separation box 12. An operating handle for driving the air regulating plate to rotate is arranged on the outside of the air separation box 12. The cross-sectional shapes of the large impurity settling chamber 122 and the small impurity settling chamber 123 are both V-shaped. A large impurity auger 126 is arranged in the large impurity settling chamber 122, and a small impurity auger 127 is arranged in the small impurity settling chamber 123. The large impurity auger 126 and the small impurity auger 127 are both connected to a impurity removal power device 128, and the impurity removal power device 128 is also connected to the roller shaft 201 of the impurity removing roller 2 of the large impurity cleaning device. The outer side of the air separation box 12 is provided with a return air channel 15, one end of the return air channel 15 is connected to the uniform air chamber 121, and the other end of the return air channel 15 is connected to the air outlet of the fan. The feed hopper 9 is provided with an impurity removal air inlet 903 connecting the uniform air chamber 121 and the feed channel 901, and the impurity removal air inlet 903 is located below the large impurity cleaning device in the feed channel 901. The large impurity outlet 902 of the feed hopper 9 is connected to the large impurity settling chamber 122, and the feed channel 901 between the impurity removal air inlet 903 and the large impurity outlet 902 forms an air separation impurity removal channel. The inner cavity size of the impurity settling chamber 122 is larger than the size of the air separation and impurity removal channel. The outer side of the air separation box 12 is provided with a large impurity pipe connected to the large impurity settling chamber 122 and a small impurity pipe connected to the small impurity settling chamber 123. Both the large impurity pipe and the small impurity pipe have impurity outlets. The light impurity separation cylinder 131 is provided in the small impurity settling chamber 123. The air inlet of the light impurity separation cylinder 131 is connected to the inner cavity of the small impurity settling chamber 123. The air outlet of the light impurity separation cylinder 131 is connected to the air inlet of the fan. The air inlet of the fan is also connected to the upper end of the vertical air suction channel 14. The lower end of the vertical air suction channel 14 is connected to the atmosphere. The vertical air suction channel 14 is provided with an air inlet adjustment mechanism 16. The air inlet adjustment mechanism 16 includes an air inlet adjustment plate 1002 provided in the vertical air suction channel 14 and hinged to the side wall of the vertical air suction channel 14. The outer side of the vertical air suction channel 14 is provided with an operating handle to drive the air inlet adjustment plate 1002 to swing.

[0029] When screening the grain material, start the impurity removal power device 128 and the fan 13, and the grain material to be screened enters from the upper end opening of the grader hopper 10, and flows along the grader channel 1001 in the grader hopper 10, and flows through the feed gap between the adjustment plate 1002 and the side plate of the grader hopper 10. The adjustment handle is operated to rotate the adjustment plate 1002 relative to the grader hopper 10, so that the size of the feed gap can be adjusted, and the feeding of the grain material can be adjusted. Increasing the feed gap can increase the feed amount entering the screen box 7, and reducing the feed gap can reduce the amount of material entering the screen box 7.

[0030] The grain material flows out from the lower opening of the material mixing hopper 10 into the feed hopper 9, and flows downward along the feed channel 901 in the feed hopper 9. The impurity removal power device 128 drives the roller shaft 201 of the impurity removal roller 2 to rotate, and the free end 4 of the screening member 1 overlaps the roller shaft 201 of the impurity removal roller 2. Under the action of the rotating roller shaft 201 and the rod 204 fixedly connected to the roller shaft 201, the screening member 1 swings up and down around its hinged end 3, and the grain material flows through the screening area 101 of the screening member 1. When the impurities are smaller than the sieve hole diameter of the screening area 101, the food materials and impurities flow downward through the sieve holes, and the large impurities such as rope ends, paper pieces, plastic cloth fragments, woven bag fragments, etc. with a particle size larger than the sieve hole diameter flow downward along the inclined screening element 1. When flowing through the impurity removal area 102, under the action of the impurity removing element 202 provided on the roller 201, the large impurities such as rope ends, paper pieces, plastic cloth fragments, woven bag fragments, etc. enter the large impurity sedimentation chamber 122, thereby achieving the removal of the large impurities.

[0031] Under the action of the fan 13, the air flow enters the uniform air chamber 121 of the air separation box 12 through the vertical air suction channel 14, then enters the feed channel 901 through the impurity removal air inlet 903, and then flows out through the large impurity outlet 902. During the flow process, the air flow meets the grain material flowing downward along the feed channel 901, and the light and fine impurities such as broken straw and dust in the grain material are carried by the air flow. The air flow carrying the light and fine impurities enters the large impurity settling chamber 122 with the air flow. Since the inner cavity space size of the large impurity settling chamber 122 is much larger than the space size of the impurity removal channel, the air flow enters the large space from the small space, the flow pressure of the air flow is reduced, the flow rate is reduced, and the slightly larger impurities among the light and fine impurities in the air flow are settled in the large impurity settling chamber 122, thereby achieving large impurity removal. After settling the large impurities, the airflow passes through the air channel 125 and enters the small impurity settling chamber 123. Since the inner cavity space of the small impurity settling chamber 123 is larger than the space of the air channel 125, the light and fine impurities in the airflow settle again. Then the airflow enters from the air inlet of the light impurity separation cylinder 131. When it flows through the pores of the light impurity separation cylinder 131, the impurities remaining in the airflow are filtered. The filtered airflow flows along the inner cavity of the light impurity separation cylinder 131, moves from the middle of the inner cavity of the light impurity separation cylinder 131 to both sides and enters the air inlet of the fan 13, and then flows out from the air outlet of the fan 13 and returns to the uniform air chamber 121 through the return air channel 15. The airflow circulates along the above flow process. The air selection of the grain material in the flow process is realized to remove the light and fine impurities in the grain material.

[0032] After the light and fine impurities are removed by air separation, the grain material flows out from the discharge port at the lower end of the feed hopper 9, and enters the screen box 7 through the feed port of the screen box 7. The screen box 7 performs a planar rotation motion under the action of the screening power device 8. The grain material entering the screen box 7 is screened and impurities are removed under the screening action of the screen grids arranged from top to bottom in the screen box 7. The clean grain after impurities are removed flows out from the clean grain outlet of the screen box 7, and then the iron filings in the grain are removed by the magnetic separator 17, thereby completing the impurity removal and screening of the grain material.

[0033] It should be noted that the above-described embodiments are illustrative of the technical solution of the present invention rather than limiting. Equivalent substitutions made by ordinary technicians in the relevant technical field or other modifications made according to the prior art should be included in the scope of rights required by the present invention as long as they do not exceed the concept and scope of the technical solution of the present invention.

Claims

1. A large debris cleaning device, characterized in that: Screening parts and cleaning rollers, The screening element is arranged obliquely downward along a first direction, and has a hinged end and a free end opposite to the hinged end. The first direction is the direction from the hinged end to the free end. Along the first direction, a screening area and a de-impurity area are sequentially arranged on the screening element. The screening area has densely arranged sieve holes. The de-impurity area is provided with long strip-shaped gaps densely arranged along a second direction. The second direction is a direction perpendicular to the first direction. A debris removing roller, wherein the debris removing roller has a rotatable roller shaft, the axis of the roller shaft is arranged along the second direction, the free end of the screening element is overlapped on the roller shaft, a debris removing piece is arranged on the roller shaft, the debris removing piece corresponds to the long strip gap in the debris removing zone of the screening element, and the debris removing piece passes through the long strip gap in the debris removing zone during the rotation of the roller shaft.

2. The large debris cleaning device according to claim 1, characterized in that: The debris-clearing component is at least one row of debris-clearing rods arranged on the roller shaft, and the multiple rows of debris-clearing rods are arranged along the circumference of the roller shaft. Each row of debris-clearing rods includes multiple debris-clearing rods, and the multiple debris-clearing rods are arranged along the axial direction of the roller shaft. The length direction of the debris-clearing rods is perpendicular to the axis of the roller shaft, and the debris-clearing rods correspond to the long strip gaps in the debris-clearing area of ​​the screening component.

3. The large debris cleaning device according to claim 1, characterized in that: At least one rod is connected to the roller shaft, the axis of the rod is arranged parallel to the axis of the roller shaft, and the multiple rods are evenly arranged along the circumference of the roller shaft. The rotating roller shaft and the rod drive the screening element to swing around the hinged end of the screening element.

4. The large debris cleaning device according to any one of claims 1 to 3, characterized in that: The screening element comprises a screen plate and a plurality of grate bars, one end of the screen plate is a hinged end of the screening element, the end of the screen plate opposite to the hinged end is a connecting end, the plurality of grate bars are connected to the connecting end of the screen plate, and the plurality of grate bars are arranged along a second direction, and the gap is a space between two adjacent grate bars.

5. The large debris cleaning device according to claim 4, characterized in that: One end of the grate bar is fixedly connected to the connecting end of the screen plate, and the other end of the grate bar has a downward bending portion. The end of the grate bar opposite to the bending portion is fixedly connected to the bottom surface of the connecting end of the screen plate. The free end of the screening element is the end where the bending portion is located. The grate bar is overlapped on the roller shaft of the cleaning roller, and its overlapping position is close to the bending portion.

6. A combined air selection screen, characterized in that: include: The screen box has a feed inlet, a clean grain outlet and a miscellaneous grain outlet. At least one layer of screen grids is arranged in the screen box. The screen box is suspended and connected to the frame through a suspension rod. The lower end of the suspension rod is connected to the screen box, and the upper end of the suspension rod is connected to the frame. The screening power device is connected to the screen box, and the screening power device drives the screen box to perform a planar rotary motion. A feed hopper, comprising a feed port, a discharge port and a feed channel connecting the feed port and the discharge port, wherein the discharge port of the feed hopper is connected to the feed port of a screen box through a flexible pipe, a large impurity cleaning device is arranged in the feed channel, and the large impurity cleaning device is the large impurity cleaning device as claimed in any one of claims 1 to 5, a hinged end of a screening member of the large impurity cleaning device is hinged to the inner wall of an outer plate of the feed hopper, a large impurity outlet communicating with the feed channel is arranged on an inner plate of the feed hopper opposite to the outer plate, a free end of the screening member passes through the large impurity outlet from the inside to the outside, and a roller shaft of an impurity removing roller of the large impurity cleaning device is rotatably connected to the feed hopper.

7. The large debris cleaning device according to claim 6, characterized in that: It also includes a material leveling hopper connected to the feed port of the feed hopper, the material leveling hopper has an upper opening, a lower opening and a material leveling channel connecting the upper opening and the lower opening, the lower opening of the material leveling hopper is connected to the feed port of the feed hopper, an adjustment plate hingedly connected to the material leveling hopper is arranged in the material leveling channel, a material passing gap is arranged between the adjustment plate and the side plate of the material leveling hopper, an adjustment handle for adjusting the material passing gap is arranged on the outside of the material leveling hopper, and the adjustment handle is connected to the hinge shaft of the adjustment plate and the material leveling hopper.

8. The large debris cleaning device according to claim 6, characterized in that: A magnetic separator is arranged in the clean grain outlet of the screen box.

9. The large debris cleaning device according to any one of claims 6 to 8, characterized in that: It also includes an air selection device, which includes an air selection box, a light impurity separation cylinder, a fan, a vertical air suction channel and a return air channel. The feed hopper is arranged in the air separation box, and the feed hopper divides the inner cavity of the air separation box into a uniform air chamber located on one side of the feed hopper and an induced air settling chamber located on the other side of the feed hopper. The induced draft settling chamber is provided with a partition, the partition divides the inner cavity of the induced draft settling chamber into a large impurity settling chamber and a small impurity settling chamber, and the partition is provided with an air passage connecting the large impurity settling chamber and the small impurity settling chamber. The outer side of the air separation box is provided with a return air channel, one end of the return air channel is connected to the air uniforming chamber, and the other end of the return air channel is connected to the air outlet of the fan. The feed hopper is provided with an impurity removal air inlet connecting the uniform air chamber and the feed channel, the impurity removal air inlet is located below the large impurity cleaning device in the feed channel, the large impurity outlet of the feed hopper is connected to the large impurity settling chamber, the feed channel between the impurity removal air inlet and the large impurity outlet forms an air separation and impurity removal channel, the inner cavity size of the large impurity settling chamber is larger than the size of the air separation and impurity removal channel, The outside of the air separation box is provided with a large impurity pipe connected to the large impurity settling chamber and a small impurity pipe connected to the small impurity settling chamber, and both the large impurity pipe and the small impurity pipe have impurity outlets. The light impurity separation cylinder is arranged in the small impurity settling chamber, the air inlet of the light impurity separation cylinder is connected with the inner cavity of the small impurity settling chamber, the air outlet of the light impurity separation cylinder is connected with the air inlet of the fan, the air inlet of the fan is also connected with the upper end of the vertical suction channel, and the lower end of the vertical suction channel is connected to the atmosphere.

10. The large debris cleaning device according to claim 9, characterized in that: The cross-sectional shapes of the large impurity settling chamber and the small impurity settling chamber are both V-shaped. A large impurity auger is arranged in the large impurity settling chamber, and a small impurity auger is arranged in the small impurity settling chamber. The large impurity auger and the small impurity auger are both connected to the impurity removal power device, and the impurity removal power device is also connected to the roller shaft of the impurity removing roller of the large impurity cleaning device.

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