Pre-grading treatment device for wheat surface cleaning

Abstract

The invention relates to the technical field of grain screening, in particular to a wheat surface cleaning and pre-grading treatment device which comprises a square screening bin capable of vertically screening and vibrating, the top of the square screening bin is fixedly communicated with an exhaust pipeline, and a first screening plate on the upper layer and a second screening plate on the lower layer are fixed in the square screening bin. A first sieve plate and a second sieve plate are arranged in the middle of the machine frame, a flow guide layer for adjusting airflow is correspondingly laid below each of the first sieve plate and the second sieve plate, a plate-groove-shell-shaped air scattering box covers the lower portion of each flow guide layer, and light particles and heavy particles are separated through vibration of the sieve plates and impact of ascending airflow in wheat grading screening. A wheat layer above the sieve plate is divided into a plurality of ascending airflow impact areas, if the wheat layer in a single area is densely stacked, a corresponding power device can be automatically caused to work, then the dense wheat layer is impacted by automatically enhancing ventilation, and light and heavy particles in the wheat layer are smoothly separated.

Description

Technical Field

[0001] The invention relates to the technical field of grain screening, in particular to a pre-grading processing device for cleaning the surface of wheat. Background Art

[0002] The gravity stoner is a kind of impurity removal equipment which utilizes the difference in density and suspension speed between granular materials and minerals, and uses mechanical wind power and a screen surface that reciprocates in a certain trajectory to separate minerals from granular materials. According to the different ways of using wind, the gravity stoner is mainly divided into several categories, such as suction type, blowing type and circulating wind type. The gravity grading stoner is one of the main equipment for flour processing and production. When screening wheat particles, it can both remove stones and grade them. The upper screen plate inside the stoner screens the raw materials into light wheat particles and mixed heavy particles. The light wheat particles are directly discharged from one end, and the mixed heavy particles fall onto the second screen plate from the other end. After screening again, the stone and heavy wheat particles are directly separated. The existing stoner has shortcomings. The screen surface has a diversion effect. When the material flow rate is large, the grading stoner The diversion effect may not be sufficient to effectively process all incoming materials, which may lead to a decrease in processing efficiency. When the air volume is unstable or the rising penetrating airflow velocity is low, the processing efficiency of the gravity grading destoner will be affected. This is because the speed and stability of the airflow are crucial to the grading and destoner process. Unstable airflow may lead to uneven grading of materials, thereby affecting the quality and output of the final product. In summary, when processing a large amount of material, the gravity grading destoner may show shortcomings due to the large inlet material flow and affected processing efficiency. When using it, it is necessary to pay attention to controlling the material flow and ensuring the stability of the airflow to maximize its processing efficiency and product quality. Based on the purpose that the rising airflow can timely and stably penetrate the wheat layer in the screening, the present invention provides a pre-grading processing device for wheat surface cleaning. Summary of the invention

[0003] The object of the present invention is to provide a device for wheat surface cleaning and pre-grading to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for pre-grading and cleaning the surface of wheat, comprising a screening material square bin with upper and lower screening and vibration, the top of the screening material square bin is fixedly connected to an exhaust duct, a first sieve plate of an upper layer and a second sieve plate of a lower layer are fixed in the screening material square bin, and a guide layer for regulating the airflow is laid under the first sieve plate and the second sieve plate respectively, each guide layer is covered with a plate groove shell-shaped wind dispersion box, the guide layer comprises a row of first shafts, a row of partitions transmission-connected to each first shaft, and a diversion integration with independent air supply on each partition.

[0005] The partition tool includes a partition, a plurality of evenly distributed control units passing through the partition, a branch worm gear connected to each row of control units, and a main worm gear connected to all the branch worm gears. One end of the main worm gear is connected to the annular bevel gear arranged on the first shaft through a fixed bevel gear, and one end of the branch worm gear is connected to the spiral teeth on the fixed gear and the main worm gear through a fixed gear. A bracket is arranged on the partition to support and position the main worm gear and the branch worm gear.

[0006] The control unit includes a round box shell for blowing air to the screen plate, a short shaft fixed on one side of the round box shell, and a limit block supporting the short shaft. The limit block is fixed on the partition, and one end of the short shaft is connected by a helical tooth meshing transmission on a fixed gear and a branch worm. The round box shell includes a disc box and an air outlet square cylinder fixed at one end of the disc box, and an air inlet plate hole is opened on the shell of the other end of the disc box, and the round box shell and the disc box pass through the plate hole opened on the partition.

[0007] The flow distribution integration includes a sub-box covered under the sieve plate, a wind tube group penetrating the bottom plate of the sub-box, and a power device for blowing air to the wind tube group. The partition is fixed in the sub-box, and the first axis penetrates the shell of the sub-box.

[0008] The wind duct group includes a wind duct, a block ring plate, a spring and an interception ring body. The wind duct passes through the bottom plate of the sub-box. A sliding block ring plate and a spring supporting the block ring plate are provided in the wind duct. The end of the spring away from the block ring plate contacts with the interception ring body, and the interception ring body is fixed on the wind duct.

[0009] The power device includes a positioning folding plate fixedly connected to the blocking ring plate, a fan distributed at the air inlet port of the air duct, a fan shaft fixedly supporting the fan, and a horizontal shaft that is vertically driven with the fan shaft.

[0010] The power device also includes an integrated plate frame fixed on the sub-box, and a brake group supported on the integrated plate frame for collecting power, a bearing group for transmission, and a spring group for releasing power. The fan shaft and the horizontal axis are respectively movably sleeved in two circular holes opened on the integrated plate frame.

[0011] The brake group includes a lifting frame, a gravity column, a return spring and a guide arc plate. A row of gravity columns are arranged in an arc shape on the lifting frame, and both ends of the row of gravity columns are in sliding contact with the guide arc plate. The guide arc plate is fixed on the sub-box. One end of the return spring is fixed on the sub-box, and the other end is fixed on the lifting frame.

[0012] The bearing group includes a pressure worm, a one-way bearing, an L-shaped swing plate and a small shaft. One end of the small shaft is connected to a row of teeth meshing transmission arranged on the lifting frame through a fixed gear. The other end of the small shaft is fixed with an L-shaped swing plate. The L-shaped swing plate is fixed on the outside of the one-way bearing. A pressure worm is fixed in the middle of the one-way bearing. The small shaft and the pressure worm are respectively movably sleeved in two column holes opened on the integrated plate frame.

[0013] The spring group includes a side shaft, a middle shaft, a spring, an outer gear ring and an arc-shaped concave rail body. The middle shaft is connected by a fixed barrel gear and a spiral tooth meshing transmission on the pressure worm. A spring is fixedly sleeved on one end of the middle shaft, and an outer gear ring is fixedly sleeved on the outside of the spring. One end of the side shaft is connected by a fixed gear and an outer gear ring meshing transmission. The other end of the side shaft is connected by a fixed bevel gear and a bevel gear fixed on the transverse shaft. The side shaft and the middle shaft are respectively movably sleeved in two through holes opened on the integrated plate frame. The integrated plate frame clamps the limiting outer gear ring by symmetrically fixing two arc-shaped concave rail bodies, and the positioning folding plate intercepts the arc plate vertically fixed on the positioning outer gear ring.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. Wheat grading and screening separates light and heavy particles through the vibration of the sieve plate and the impact of the rising air flow. In order to solve the problem of uneven distribution of wheat accumulation layers during the screening process, the present invention divides the wheat layer above the sieve plate into multiple rising air flow impact areas. If the wheat layer in a single area is densely accumulated, it will automatically cause the corresponding power device to work, and then automatically enhance ventilation to impact the dense wheat layer, so that the light and heavy particles in the wheat layer can be separated smoothly.

[0015] 2. The power device in the present invention will automatically collect power from screening vibrations. Once the wheat layer is densely accumulated and the airflow ventilation slows down, it will automatically adjust to release the power accumulated in the power device, and then the fan will rotate to enhance ventilation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention.

[0017] Figure 2 Schematic diagram of the position of the first screen plate.

[0018] Figure 3 Schematic diagram of the location of the diversion layer.

[0019] Figure 4 Schematic diagram of the guide layer structure.

[0020] Figure 5 Schematic diagram of the partition structure.

[0021] Figure 6 This is a schematic diagram of the control unit structure.

[0022] Figure 7 Schematic diagram of the diversion integration structure.

[0023] Figure 8 This is a schematic diagram of the box structure.

[0024] Fig. 9 This is a schematic diagram of the power unit structure.

[0025] Fig.10 This is a schematic diagram of the brake group structure.

[0026] Fig.11 This is a schematic diagram of the structure of the clockwork group.

[0027] Fig.12 Schematic diagram of the outer gear ring structure.

[0028] In the figure: screening material square bin 1, first screen plate 2, second screen plate 3, guide layer 4, exhaust duct 5, air dispersion box 6, first shaft 7, partition 8, flow distribution integration 9, main worm 10, branch worm 11, partition 12, direction control unit 13, short shaft 14, limit block 15, round box shell 16, sub-box 17, air cylinder group 18, power device 19, air cylinder 20, blocking ring plate 21, spring 22, interception ring Body 23, fan 24, fan shaft 25, positioning folding plate 26, horizontal axis 27, spring group 28, integrated plate frame 29, bearing group 30, brake group 31, lifting frame 32, gravity column 33, return spring 34, guide arc plate 35, pressure worm 36, one-way bearing 37, L-shaped swing plate 38, small shaft 39, side shaft 40, middle shaft 41, spring 42, outer gear ring 43, arc-shaped concave track body 44. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the technical solutions in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figures 1 to 12The present invention provides a technical solution: a wheat surface cleaning pre-grading processing device, comprising a screening material square bin 1 with upper and lower screening and vibration, the top of the screening material square bin 1 is fixedly connected with an exhaust duct 5, the screening material square bin 1 is fixed with an upper first sieve plate 2 and a lower second sieve plate 3, and a guide layer 4 for regulating airflow is laid under the first sieve plate 2 and the second sieve plate 3, each guide layer 4 is covered with a plate slot shell-shaped air dispersion box 6, the guide layer 4 includes a row of first shafts 7, each first A row of partitions 8 are transmission-connected on the shaft 7, and a diversion integration 9 with independent air supply on each partition 8 injects air into the air dispersion box 6 through the air injection mechanism in the prior art. The air in the air dispersion box 6 below the first sieve plate 2 rises and passes through the guide layer 4 and the first sieve plate 2, and then rises and is discharged through the exhaust duct 5. The air in the air dispersion box 6 below the second sieve plate 3 passes through the guide layer 4 and the second sieve plate 3, and then flows to the edge of the second sieve plate 3. After no interception, it rises and converges to the exhaust duct 5 for discharge.

[0031] When wheat is screened, the first sieve plate 2, the second sieve plate 3, the guide layer 4 and the air dispersion box 6 are all synchronously accompanied by the vibration of the screening material square bin 1, and the wheat layer above the first sieve plate 2 and the second sieve plate 3 vibrates. At the same time, there is an upward airflow in the first sieve plate 2 and the second sieve plate 3, and the airflow impacts the wheat layer. The heavy particles in the wheat are concentrated in the lower part of the wheat layer, while the light particles are in the upper part of the wheat layer. The first sieve plate 2 and the second sieve plate 3 are in an inclined state, and the upward airflow directly impacts the heavy particles. The heavy particles are transported obliquely upward under the vibration and the impact of the airflow. The airflow force after the impact is weakened, and the impact on the light particles is small. The light particles are affected by gravity and screening vibration and are transported obliquely downward. In this way, the heavy particles and light particles in the wheat are separated, that is, the light wheat particles and the heavy particle mixture are separated above the first sieve plate 2, and the heavy wheat particles and the shoulder stones are separated above the second sieve plate 3.

[0032] During the actual screening process, the rising air flow passing through the sieve plate may be unevenly distributed, and the density of the wheat layer on the sieve plate may be unevenly distributed, thereby reducing the screening effect. Therefore, the present invention evenly distributes the rising air flow through the evenly distributed diversion integration 9, thereby solving the problem of uneven rising air flow. In addition, if the wheat layer on the sieve plate is sealed and rises during screening, the rising air flow cannot penetrate smoothly, which will automatically trigger the adjustment mechanism inside the diversion integration 9. Subsequently, the diversion integration 9 automatically enhances ventilation to ensure that the rising air flow can penetrate the wheat layer with increased density, so as to separate the light and heavy particles in the wheat layer.

[0033] refer to Figure 5It is understood that the partition 8 includes a partition 12, a plurality of evenly distributed control units 13 passing through the partition 12, a branch worm 11 transmission-connected to each row of control units 13, and a main worm 10 transmission-connected to all the branch worms 11, one end of the main worm 10 is meshingly connected to the annular bevel gear arranged on the first shaft 7 through a fixed bevel gear, one end of the branch worm 11 is meshingly connected to the helical teeth on the fixed gear and the main worm 10, and a bracket is arranged on the partition 12 to support and position the main worm 10 and the branch worm 11.

[0034] refer to Figure 6 It is understood that the control unit 13 includes a round box shell 16 for blowing air to the screen plate, a short shaft 14 fixed on one side of the round box shell 16, and a limit block 15 for supporting the short shaft 14. The limit block 15 is fixed on the partition 12, and one end of the short shaft 14 is connected by a spiral tooth meshing transmission on a fixed gear and a branch worm 11. The round box shell 16 includes a disc box and an air outlet square cylinder fixed at one end of the disc box, and an air inlet plate hole is opened on the shell of the other end of the disc box. The disc box of the round box shell 16 passes through the plate hole opened on the partition 12, and the short shaft 14 is movably sleeved in the through hole opened on the limit block 15.

[0035] All the first shafts 7 are connected to an integrated shaft, and all the first shafts 7 are driven to rotate by rotating the integrated shaft, and then all the branch worms 11 are driven by the main worm 10, so as to adjust all the direction control units 13. The branch worm 11 rotates to drive the short shaft 14, and then the round box shell 16 rotates. The air outlet square tube on the round box shell 16 changes in the opposite direction. The round box shell 16 is distributed under the inclined screen plate. The rotation of the round box shell 16 can change the impact angle of the rising airflow. Before the screening work, the impact angle of the rising airflow is set by adjustment.

[0036] refer to Figure 7 It is understood that the diversion integration 9 includes a sub-box 17 covered under the sieve plate, a wind tube group 18 penetrating the bottom plate of the sub-box 17, and a power device 19 for blowing air to the wind tube group 18, the partition 12 is fixed in the sub-box 17, and the first shaft 7 penetrates the shell of the sub-box 17.

[0037] refer to Fig. 9 It is understood that the wind duct group 18 includes a wind duct 20, a blocking ring plate 21, a spring 22 and an intercepting ring body 23. The wind duct 20 passes through the bottom plate of the sub-box 17. A sliding blocking ring plate 21 and a spring 22 supporting the blocking ring plate 21 are provided in the wind duct 20. The end of the spring 22 away from the blocking ring plate 21 contacts the intercepting ring body 23, and the intercepting ring body 23 is fixed on the wind duct 20.

[0038] refer to Fig. 9It is understood that the power device 19 includes a locking folding plate 26 fixedly connected to the blocking ring plate 21, a fan 24 distributed at the air inlet port of the air duct 20, a fan shaft 25 fixedly supporting the fan 24, and a horizontal shaft 27 that is vertically driven by the fan shaft 25.

[0039] The power device 19 also includes an integrated plate frame 29 fixed on the sub-box 17, and a brake group 31 for collecting power, a bearing group 30 for transmission and a spring group 28 for releasing power supported on the integrated plate frame 29. The fan shaft 25 and the horizontal axis 27 are respectively movably connected in two circular holes opened on the integrated plate frame 29.

[0040] The brake group 31 includes a lifting frame 32, a gravity column 33, a return spring piece 34 and a guide arc plate 35. A row of gravity columns 33 are arranged in an arc shape on the lifting frame 32, and both ends of the row of gravity columns 33 are in sliding contact with the guide arc plate 35. The guide arc plate 35 is fixed on the sub-box 17. One end of the return spring piece 34 is fixed on the sub-box 17, and the other end is fixed on the lifting frame 32.

[0041] The bearing group 30 includes a pressure worm 36, a one-way bearing 37, an L-shaped swing plate 38 and a small shaft 39. One end of the small shaft 39 is connected to a row of teeth meshing transmission arranged on the lifting frame 32 through a fixed gear. The other end of the small shaft 39 is fixed with an L-shaped swing plate 38. The L-shaped swing plate 38 is fixed to the outside of the one-way bearing 37. The pressure worm 36 is fixed in the middle of the one-way bearing 37. The small shaft 39 and the pressure worm 36 are respectively movably sleeved in two column holes opened on the integrated plate frame 29.

[0042] The spring group 28 includes a side shaft 40, a center shaft 41, a spring 42, an outer gear ring 43 and an arc-shaped concave rail body 44. The center shaft 41 is connected by a fixed barrel gear and a spiral tooth meshing transmission on the pressure worm 36. One end of the center shaft 41 is fixedly sleeved with a spring 42, and the outer gear ring 43 is fixedly sleeved on the outside of the spring 42. One end of the side shaft 40 is connected by a meshing transmission with the outer gear ring 43 through a fixed gear, and the other end of the side shaft 40 is connected by a meshing transmission with a fixed bevel gear and a bevel gear fixed on the transverse shaft 27. The side shaft 40 and the center shaft 41 are respectively movably sleeved in two through holes opened on the integrated plate frame 29. The integrated plate frame 29 clamps the limiting outer gear ring 43 by symmetrically fixing two arc-shaped concave rail bodies 44, and the positioning folding plate 26 intercepts the arc plate vertically fixed on the positioning outer gear ring 43.

[0043] The external air injection mechanism injects air into the air dispersion box 6, and then diffuses it through multiple sub-boxes 17. Specifically, after the air passes through the air duct 20, it diffuses into multiple round box shells 16, and then is discharged through the sieve plate to impact the wheat layer that is screened and vibrated. If the wheat layer is dense, it is difficult for the natural air flow to pass through, and the airflow through the air duct 20 is slow. Under normal circumstances, the airflow in the air duct 20 impacts the blocking ring plate 21, and the blocking ring plate 21 drives the positioning folding plate 26 to move. The positioning folding plate 26 will intercept the arc plate on the positioning outer gear ring 43. Once the airflow in the air duct 20 flows slowly, the spring 22 rebounds and pushes the blocking ring plate 21. The blocking ring plate 21 moves axially and drives the positioning folding plate 26. Fig.11 The folding plate 26 in the middle rises and no longer blocks the arc plate on the outer gear ring 43, so that the outer gear ring 43 can rotate. The rotation of the outer gear ring 43 drives the side shaft 40, and then transmits the fan shaft 25 through the horizontal shaft 27, thereby driving the fan 24 to rotate rapidly. The rotation of the fan 24 helps to enhance the ventilation in the air duct 20, so that a stronger airflow is injected into the sub-box 17 through the air duct 20, and then dispersed through the round box shell 16 to impact the wheat layer on the sieve plate. The stronger airflow impacts the dense wheat layer, so that the light and heavy particles in the wheat layer are separated.

[0044] The force storage process of the outer gear ring 43 is as follows: the sub-box 17 vibrates along with the screening square bin 1 during screening. When the sub-box 17 vibrates up and down, the gravity column 33 will reciprocate relative to the sub-box 17 due to inertia, and the gravity column 33 drives the lifting frame 32. The lifting frame 32 drives the small shaft 39 during the reciprocating movement. Then the L-shaped swing plate 38 reciprocates to drive the one-way bearing 37, thereby controlling the intermittent directional rotation of the pressure worm 36. Next, the rotation of the neutral shaft 41 causes the mainspring 42 to contract and store force, and the outer gear ring 43 will not rotate. Once the locking folding plate 26 no longer locks the arc plate on the outer gear ring 43, the mainspring 42 will release power to drive the outer gear ring 43 to rotate, and through subsequent rotation, it provides power for the rotation of the fan 24.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wheat surface cleaning and pre-grading device, comprising a screening material square bin (1) with upper and lower screening and vibration, characterized in that: The top of the screening material square bin (1) is fixedly connected to an exhaust duct (5), a first sieve plate (2) on the upper layer and a second sieve plate (3) on the lower layer are fixed in the screening material square bin (1), and a guide layer (4) for regulating the airflow is laid below the first sieve plate (2) and the second sieve plate (3), and each guide layer (4) is covered with a plate slot shell-shaped air dispersion box (6) below, and the guide layer (4) comprises a row of first shafts (7), a row of partitions (8) drivingly connected to each first shaft (7), and a flow distribution integration (9) for independent air supply on each partition (8).

2. A wheat surface cleaning pre-grading treatment device according to claim 1, characterized in that: The partition tool (8) comprises a partition (12), a plurality of evenly distributed direction control units (13) penetrating the partition (12), a branch worm (11) connected to each row of direction control units (13), and a main worm (10) connected to all the branch worms (11), one end of the main worm (10) being connected to a ring bevel gear provided on the first shaft (7) through meshing transmission, one end of the branch worm (11) being connected to a fixed bevel gear through meshing transmission with a spiral tooth on the main worm (10), and a bracket being provided on the partition (12) to support and position the main worm (10) and the branch worm (11).

3. A wheat surface cleaning pre-grading treatment device according to claim 2, characterized in that: The control unit (13) comprises a round box shell (16) for blowing air to the sieve plate, a short shaft (14) fixed on one side of the round box shell (16), and a stop block (15) supporting the short shaft (14), wherein the stop block (15) is fixed on the partition (12), and one end of the short shaft (14) is connected to the spiral teeth on the fixed gear and the branch worm (11) through a meshing transmission, and the round box shell (16) comprises a disc box and an air outlet square cylinder fixed on one end of the disc box, and an air inlet plate hole is provided on the shell of the other end of the disc box, and the disc box of the round box shell (16) passes through the plate hole provided on the partition (12).

4. A wheat surface cleaning pre-grading device according to claim 2, characterized in that: The flow distribution integration (9) comprises a sub-box (17) covered under the sieve plate, a wind tube group (18) penetrating the bottom plate of the sub-box (17), and a power device (19) for blowing air to the wind tube group (18), the partition plate (12) is fixed in the sub-box (17), and the first shaft (7) penetrates the shell of the sub-box (17).

5. The device for pre-grading wheat surface cleaning according to claim 4, characterized in that: The wind tube assembly (18) comprises a wind tube (20), a blocking ring plate (21), a spring (22) and an intercepting ring body (23); the wind tube (20) penetrates the bottom plate of the sub-box (17); a sliding blocking ring plate (21) and a spring (22) supporting the blocking ring plate (21) are arranged in the wind tube (20); an end of the spring (22) away from the blocking ring plate (21) contacts the intercepting ring body (23); and the intercepting ring body (23) is fixed to the wind tube (20).

6. The device for pre-grading wheat surface cleaning according to claim 5, characterized in that: The power device (19) comprises a positioning folding plate (26) fixedly connected to the baffle plate (21), a fan (24) distributed at the air inlet port of the wind tube (20), a fan shaft (25) fixedly supporting the fan (24), and a transverse shaft (27) vertically driven by the fan shaft (25).

7. The device for pre-grading wheat surface cleaning according to claim 6, characterized in that: The power device (19) further comprises an integrated plate frame (29) fixed on the sub-box (17), and a brake group (31) for collecting power, a bearing group (30) for transmission, and a spring group (28) for releasing power supported on the integrated plate frame (29), and the fan shaft (25) and the horizontal shaft (27) are respectively movably sleeved in two circular holes opened on the integrated plate frame (29).

8. The device for pre-grading wheat surface cleaning according to claim 7, characterized in that: The brake group (31) comprises a lifting frame (32), a gravity column (33), a return spring piece (34) and a guide arc plate (35); a row of gravity columns (33) are arranged in an arc shape on the lifting frame (32), and both ends of the row of gravity columns (33) are in sliding contact with the guide arc plate (35); the guide arc plate (35) is fixed on the sub-box (17); one end of the return spring piece (34) is fixed on the sub-box (17), and the other end is fixed on the lifting frame (32).

9. The device for pre-grading wheat surface cleaning according to claim 8, characterized in that: The bearing group (30) comprises a pressure worm (36), a one-way bearing (37), an L-shaped swing plate (38) and a small shaft (39); one end of the small shaft (39) is connected to a row of teeth meshing and transmission arranged on the lifting frame (32) through a fixed gear; the other end of the small shaft (39) is fixed with the L-shaped swing plate (38); the L-shaped swing plate (38) is fixed to the outside of the one-way bearing (37); the middle of the one-way bearing (37) is fixed with the pressure worm (36); the small shaft (39) and the pressure worm (36) are respectively movably sleeved in two column holes opened on the integrated plate frame (29).

10. The wheat surface cleaning and pre-grading device according to claim 9, characterized in that: The spring assembly (28) comprises a side shaft (40), a center shaft (41), a spring (42), an outer gear ring (43) and an arc-shaped concave track body (44); the center shaft (41) is connected to the pressure worm (36) through a spiral tooth meshing transmission connection via a fixed cylinder gear and a pressure worm (36); one end of the center shaft (41) is fixedly sleeved with a spring (42); the outer side of the spring (42) is fixedly sleeved with an outer gear ring (43); one end of the side shaft (40) is connected to the pressure worm (36) through a fixed gear and an outer gear ring (43); ) is meshed and driven, the other end of the side shaft (40) is meshed and driven by a fixed bevel gear and a bevel gear fixed on the transverse shaft (27), the side shaft (40) and the center shaft (41) are respectively movably sleeved in two through holes opened on the integrated plate frame (29), the integrated plate frame (29) clamps the limiting outer gear ring (43) by symmetrically fixing two arc-shaped concave rail bodies (44), and the positioning folding plate (26) intercepts the arc plate vertically fixed on the positioning outer gear ring (43).

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