Grain filter hopper for various terrains and wind directions
By designing a grain filter bucket including imitation terrain mobile devices and multi-layer filtration systems, the problem that the prior art cannot adapt to multiple terrain and wind directions is solved, and efficient grain screening and storage is achieved, suitable for complex terrain and variable weather conditions.
Patent Information
- Application Number
- CN202411889096.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-03-21
AI Technical Summary
The existing grain filter bucket cannot adapt to operations in multiple terrains and different wind directions, resulting in the inability to effectively screen and store grain under complex terrain and changing weather conditions.
A grain filter bucket including a rack, a filtration device, a grain delivery bucket, a dust removal assembly, a conveyor belt and a shelling assembly were designed. The device realizes stable movement on multiple terrain by imitating the front and rear wheels of the terrain. The filtering device uses a multi-layer filter mesh and a vibration motor for multi-stage filtration. The dust removal assembly and shelling assembly further remove impurities. The conveyor belt is designed to be completely closed to adapt to various wind directions.
It realizes efficient screening and storing of grain under various terrain and wind conditions, reduces operational processes, saves manpower and material resources, improves the quality of grain storage, and enables equipment to be used 24/7.
Smart Images

Figure CN119657477A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of grain storage and processing, and in particular to a grain filtering bucket used for various terrains and wind directions. Background Art
[0002] The boundary between urbanization and agricultural land in my country will become more obvious, and the number of large farms will gradually increase. In some places, the agricultural resource endowment is not suitable for growing conventional field crops, and in some mountainous areas, large agricultural machinery cannot be used. Therefore, the mechanization problem in these "special" areas has become one of the bottlenecks restricting the improvement of the overall mechanization level of agricultural production.
[0003] When grain is harvested by a harvester, it is often easy to mix with various impurities, including inorganic impurities such as dust, sand, mud, stones, coal slag, metal objects, and organic impurities such as plant roots, stems, leaves, shells, weed seeds, moldy grains, insect corpses, and sack pieces. These impurities not only have a great impact on the quality of grain powder and safe production, but also directly endanger human health. After the grain is harvested, a screening device is needed to screen and remove the impurities from the grain, and most of the impurities can be filtered out before they can be safely stored. However, the grain filter bucket in the prior art can only meet the operation of a single terrain. When faced with different complex terrains, such as wasteland, mountainous land, sandy land, etc., it cannot adapt to the operation of complex terrain. To this end, we propose a grain filter bucket for multiple terrains and wind directions. Summary of the invention
[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a grain filtering bucket for various terrains and wind directions.
[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: The present invention discloses a grain filtering bucket for use in various terrains and wind directions, comprising a frame, a filtering device installed above the frame, a grain feeding hopper connected to the filtering device above, a dust removal assembly connected to one side of the filtering device, a conveyor belt provided below the dust removal assembly, a shelling assembly connected to one side of the dust removal assembly, the bottoms of the dust removal assembly and the shelling assembly are both fixed on the frame, a moving device and a driving assembly are also connected below the frame, and a plurality of positioning assemblies are also connected to both sides of the frame.
[0006] As a preferred technical solution of the present invention, the filtering device includes a vibration motor, a filter box and a discharge box. The filter box is movably mounted on the frame by a plurality of springs. The base of the vibration motor is fixed to the two side walls of the filter box. The inside of the filter box is provided with multiple layers of filter screens for filtering impurities from top to bottom. The upper surface and two side surfaces of the filter box are also provided with a plurality of first cleaning holes for cleaning impurities. The top of the discharge box is provided with a plurality of second cleaning holes for cleaning impurities. The first automatic impurity removal channels are symmetrically arranged on both sides of the discharge box, the second automatic impurity removal channels are symmetrically arranged on the bottom surface of the discharge box, and a discharge port is also welded on one side below the discharge box.
[0007] As a preferred technical solution of the present invention, a V-shaped buffer baffle is provided inside the grain feeding hopper, and the upper end surface of the V-shaped buffer baffle is opposite to the external grain conveyor belt. A square opening is provided at the bottom of the grain feeding hopper, and the square opening is located above the uppermost filter mesh.
[0008] As a preferred technical solution of the present invention, the dust removal assembly includes a cyclone and a dust removal box, a feed port is provided on one side of the dust removal box, the feed port corresponds to the position of the discharge port, the bottom of the dust removal box is fixed to the top of the frame by bolts, the cyclone is fixed to the top of the dust removal box by bolts and is connected to the top of the dust removal box, and a grain filter outlet is also provided at the bottom of the dust removal box.
[0009] As a preferred technical solution of the present invention, the shelling component includes a sedimentation box, a connecting pipe, a spiral impurity discharge pipe and a first driving motor. A through hole is provided on one side of the sedimentation box to communicate with the outlet of the cyclone. The bottom of the sedimentation box is connected to the top of the connecting pipe. The bottom of the connecting pipe is connected to the spiral impurity discharge pipe. The spiral impurity discharge pipe is provided with spiral blades and a rotating shaft. The spiral blades are welded to the rotating shaft. The rotating shaft is connected to the first driving motor through a belt. The base of the first driving motor is fixed to the top of the frame by bolts. A plurality of square through holes for discharging dust are provided on the other side of the sedimentation box.
[0010] As a preferred technical solution of the present invention, the mobile device includes two terrain-mimicking front wheels and two terrain-mimicking rear wheels, the terrain-mimicking front wheels are symmetrically distributed on the outside of the frame, and the terrain-mimicking rear wheels are symmetrically distributed on the inside of the frame, the terrain-mimicking front wheels and the two terrain-mimicking rear wheels are respectively connected to the bottom end of the frame through fixed brackets, and the driving assembly is connected to the mobile device for driving the mobile device to move.
[0011] As a preferred technical solution of the present invention, the driving assembly includes an electric motor, a transmission mechanism, a battery pack, a steering wheel and a seat. The electric motor is fixed under the frame, and the power generated by the electric motor is transmitted to the terrain-mimicking rear wheel through the transmission mechanism. The battery pack and the seat are respectively fixed above the frame, and the steering wheel is connected to the terrain-mimicking front wheel through the transmission mechanism.
[0012] As a preferred technical solution of the present invention, a plurality of guide shaft seats are provided on the side of the frame, the positioning assembly is movably connected to the frame through the guide shaft seats, the positioning assembly has a 7-shaped appearance, and a plurality of the positioning assemblies are symmetrically arranged along the center of the frame.
[0013] As a preferred technical solution of the present invention, the conveyor belt also includes a second drive motor and a belt conveyor belt. The base of the second drive motor is fixed on the frame, the bottom of the belt conveyor belt is welded to the frame through a bracket, and a wind shield is also provided above the belt conveyor belt.
[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention is provided with a mobile device, and the movement of the entire device is realized by controlling the movement of the terrain-mimicking front wheels and rear wheels. The design of the terrain-mimicking front wheels and rear wheels makes the contact area between the device and the ground larger, increases the stability of the device, and enables the device to travel on various terrains. The design of the positioning component makes it convenient for the device to be positioned on any terrain, so it can adapt to various complex terrains and is easy to promote and use; 2. The present invention uses a filtering device to enable the grain to be directly screened and filtered after harvesting and then stored, which not only reduces the operating procedures, but also saves manpower and material resources, and is convenient and practical; and by setting up a multi-layer filter net, the grain can be filtered and impurities removed at multiple levels, thereby improving the storage quality of the grain; 3. The fully enclosed conveyor belt and filter structure design can be adapted to various wind directions and weather conditions, enabling all-weather use of the equipment and increasing the use scenarios and applicable environments of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a front view of the present invention; Figure 3 is a side view of the present invention; Figure 4 It is a right side view of the present invention; Figure 5 is a top view of the present invention; Figure 6 is a bottom view of the present invention; In the figure: 1, frame; 2, filtering device; 3, grain hopper; 4, dust removal component; 5, conveyor belt; 6, shelling component; 7, moving device; 8, driving component; 9, positioning component; 11, vibration motor; 12, filter box; 13, discharge box; 14, filter screen; 15, first cleaning hole; 16, second cleaning hole; 17, first automatic impurity discharge channel; 18, second automatic impurity discharge channel; 19, discharge port; 20, V-shaped buffer baffle; 21, cyclone; 22, dust removal box; 23, feed port; 24, grain filter outlet; 31, sedimentation box; 32, connecting pipe; 33, spiral impurity discharge pipe; 34, first drive motor; 41, terrain-imitation front wheel; 42, terrain-imitation rear wheel; 51, electric motor; 52, transmission mechanism, 53, battery pack; 54, steering wheel; 55, seat; 56, second drive motor; 57, belt conveyor; 58, windshield. DETAILED DESCRIPTION
[0016] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.
[0017] In the drawings, the same reference numerals all refer to the same components.
[0018] like Figure 1-6 As shown, the present invention provides a grain filter bucket for various terrains and wind directions, including a frame 1, a filter device 2 is rotatably installed above the frame 1, a grain feeding bucket 3 is connected above the filter device 2, a dust removal component 4 is connected to one side of the filter device 2, a conveyor belt 5 is provided below the dust removal component 4, a shelling component 6 is connected to one side of the dust removal component 4, the bottoms of the dust removal component 4 and the shelling component 6 are both fixed to the frame 1 by bolts, a moving device 7 and a driving component 8 are also connected below the frame 1, and a plurality of positioning components 9 are also connected to both sides of the frame 1. The present invention realizes the ability to meet the stable docking operation in multiple terrains through the moving device 7, the driving component 8 and the positioning component 9, and then realizes the function of grain screening through the filter device 2. When the grain filter bucket of the present application is working, the terrain-mimicking tire is in contact with the ground and can float up and down with the undulations of the terrain, thereby driving the frame 1 to float up and down, so that the frame 1 always maintains a suitable distance from the ground, preventing the frame 1 from colliding with the ground and being damaged; therefore, due to the presence of the terrain-mimicking device, the frame 1 can adapt to different complex terrains by floating up and down, thereby ensuring the efficient operation of the grain filter bucket.
[0019] The use of the present invention is as follows: 1. The grain is transported to the top of the grain feeding hopper 3 through the external grain conveyor belt. The grain falls onto the V-shaped buffer baffle 20 on the grain feeding hopper 3 due to gravity, and then falls evenly onto the multi-layer screen 14 of the filter box 12 after diversion; 2. After being screened by the screen 14, the grain is filtered by the bottom screen 14 and flows into the dust removal assembly 4. The impurities in the grain that have been filtered are automatically discharged through the first automatic impurity discharge channel 17 and the second automatic impurity discharge channel 18 on the filter box 12. The impurities that remain on the screen 14 are manually removed through the first cleaning hole 15 and the second cleaning hole 16. The filtered grain is transported to the dust removal box 22 through the discharge port 19. The light rice husks and dust in the grain are absorbed by the cyclone 21. The dusted grain falls from the grain filter outlet 24 onto the belt conveyor 57 and is then transported to an external storage box (not shown). 3. After being absorbed by the cyclone 21, the light rice husks and dust in the grain enter the sedimentation box 31 on the hull removal assembly. Under the action of gravity, the light impurities such as rice husks fall into the spiral impurity discharge pipe 33 through the connecting pipe 32, and then are discharged from the outlet at one end of the spiral impurity discharge pipe 33 through the thrust of the spiral blades, and the floating dust is discharged through the outlet on the side of the sedimentation box 31.
[0020] Further, such as Figure 1-5As shown, the filter device 2 includes a vibration motor 11, a filter box 12 and a discharge box 13. The filter box 12 is rotatably mounted on the frame 1 through a plurality of springs and fixed supports. The base of the vibration motor 11 is fixed to the two side walls of the filter box 12 by bolts, and is used to drive the filter box 12 to vibrate periodically up and down. Multiple layers of filter screens 14 for filtering impurities are arranged from top to bottom inside the filter box 12. The filter screens 14 are fixed to the two side walls of the filter box 12 by fixed brackets. A plurality of meshes for screening densely distributed impurities are arranged on the filter screen 14, and the meshes of the filter screen 14 gradually become smaller from top to bottom. The upper surface and two side surfaces of the filter box 12 are also provided with first cleaning holes 15 for cleaning impurities, which are respectively used to manually clean the impurities accumulated on the upper and middle filter screens 14. A plurality of second cleaning holes 16 for cleaning impurities are arranged on the top of the discharge box 13, which are respectively used to manually clean the impurities accumulated at the bottom of the upper and middle filter screens 14. The first automatic impurity discharge channel 17 is symmetrically arranged on both sides of the discharge box 13. The interior of the first automatic impurity discharge channel 17 is connected to the upper and middle filter screens 14. When the filter box 12 vibrates, the impurities on the upper and middle filter screens 14 are automatically discharged from the first automatic impurity discharge channel 17. The second automatic impurity discharge channel 18 is symmetrically arranged on the bottom surface of the discharge box 13. The second automatic impurity discharge channel 18 is connected to the bottom surface of the filter box 12. When the filter box 12 vibrates, the impurities filtered by the bottom filter screen 14 are automatically discharged from the second automatic impurity discharge channel 18. A discharge port 19 is also welded on one side below the discharge box 13. The grain filtered by the filter screen 14 at multiple levels is discharged from the discharge port 19 to the dust removal component 4 behind.
[0021] Further, such as Figure 5 As shown, the grain feeding hopper 3 is funnel-shaped, and a V-shaped buffer baffle 20 is welded inside the funnel. The highest point of the upper end surface of the V-shaped buffer baffle 20 is opposite to the external grain conveyor belt. When the grain is transported to the feeding hopper 3, it will be blocked by the V-shaped buffer baffle 20, so that it is evenly spread in all directions, thereby avoiding the concentrated accumulation of grain on the filter 14, causing impurities to block the mesh of the filter 14, and increasing the filtering efficiency. A square opening is provided at the bottom of the grain feeding hopper 3, and the square opening is located above the uppermost filter 14.
[0022] Further, such as Figure 2 As shown, the dust removal assembly 4 includes a cyclone 21 and a dust removal box 22. A feed inlet 23 is provided on one side of the dust removal box 22. The feed inlet 23 corresponds to the position of the discharge port 19. The grain filtered by the filter 14 enters the dust removal box 22 through the feed inlet 23 to further remove impurities such as rice husks and dust. The bottom of the dust removal box 22 is fixed to the top of the frame 1 by bolts. The cyclone 21 is fixed to the top of the dust removal box 22 by bolts and communicates with the top of the dust removal box 22 to absorb light impurities such as rice husks and dust in the grain. A grain filter outlet 24 is also provided at the bottom of the dust removal box 22 to discharge the grain after husking.
[0023] Further, such as Figure 2 As shown, the hulling assembly 6 includes a sedimentation box 31, a connecting pipe 32, a spiral impurity discharge pipe 33 and a first driving motor 34. A through hole is provided on one side of the sedimentation box 31 to communicate with the outlet of the cyclone 21. The impurities sucked by the cyclone 21 are pushed into the sedimentation box 31 by the cyclone 21 for sedimentation. The bottom of the sedimentation box 31 is connected to the top of the connecting pipe 32, and the bottom of the connecting pipe 32 is connected to the spiral impurity discharge pipe 33. The heavy rice husks and other impurities fall automatically into the spiral impurity discharge pipe 33 under the action of gravity. The spiral impurity discharge pipe 33 is provided with a spiral blade and a rotating shaft. The spiral blade is welded to the rotating shaft. The rotating shaft is connected to the first driving motor 34 through a belt. The first driving motor 34 drives the rotating shaft to rotate, thereby driving the spiral blade to rotate, and pushes the rice husks and other impurities to the outlet at the end of the spiral impurity discharge pipe 33 until they are discharged. The base of the first driving motor 34 is fixed to the top of the frame 1 by bolt connection. A plurality of square through holes for discharging dust are opened on the other side of the sedimentation box 31. The separated dust is discharged from the position of the square through holes.
[0024] Furthermore, the mobile device 7 includes two terrain-adapting front wheels 41 and two terrain-adapting rear wheels 42. The terrain-adapting front wheels 41 are symmetrically distributed on the outer side of the frame 1, and the terrain-adapting rear wheels 42 are symmetrically distributed on the inner side of the frame 1. The terrain-adapting front wheels 41 and the two terrain-adapting rear wheels 42 are respectively connected to the bottom of the frame 1 through fixed brackets. The terrain-adapting tires can bring the frame 1 to float up and down with the terrain, so that the frame 1 always maintains a suitable distance from the ground; during the working process, the frame 1 will not be damaged due to direct contact with the ground.
[0025] Furthermore, the driving assembly 8 includes a motor 51, a transmission mechanism 52, a battery pack 53, a steering wheel 54 and a seat 55. The motor 51 is fixed to the bottom of the frame 1 by bolts, and the power generated by the motor 51 is transmitted to the terrain-imitation rear wheel 42 through the transmission mechanism 52, thereby driving the entire grain filter bucket to move. The battery pack 53 is fixed to the top of the frame 1 through a fixing plate, the seat 55 is welded to the top of the frame 1, and the steering wheel 54 is connected to the terrain-imitation front wheel 41 through the transmission mechanism 52, thereby controlling the steering of the terrain-imitation front wheel 41.
[0026] Further, a plurality of guide shaft seats are provided on the side of the frame 1. Preferably, two guide shaft seats are provided on the left and right sides of the frame 1, and the positioning assembly 9 is movably connected to the frame 1 through the guide shaft seats. The plurality of positioning assemblies 9 are symmetrically arranged along the center of the frame 1, and the positioning assembly 9 can move up and down along the guide shaft seats to fix and position the frame 1. The positioning assembly 9 is 7-shaped, which facilitates the positioning assembly 9 to be easily inserted into the soil and ensures stable positioning of the device.
[0027] Furthermore, the conveyor belt 5 also includes a second drive motor 56 and a belt conveyor belt 57. The base of the second drive motor 56 is fixed to the frame 1 by bolts. The bottom of the belt conveyor belt 57 is welded to the frame 1 by a bracket. A wind shield 58 is also provided above the belt conveyor belt 57. Both sides of the wind shield 58 are fixed to the belt conveyor belt 57. One end of the belt conveyor belt 57 is arranged below the grain filter outlet 24, and the other end protrudes from the outside of the frame 1. The wind shield 58 and the belt conveyor belt 57 form a closed conveying channel to adapt to environments with different wind directions and prevent strong winds from affecting the work of the grain hopper.
[0028] The present invention is a grain filtering bucket used in various terrains and wind directions. The movement of the entire device is achieved through the design of terrain-mimicking wheels, so that the device can be used in various terrains, which is convenient for promotion and use. A completely enclosed conveyor belt and filtering structure design is adopted, which can be applicable to various wind directions and weather conditions, thereby increasing the use scenarios of the equipment.
[0029] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A grain filter hopper for use in various terrains and wind directions, comprising a frame (1), characterized in that: A filter device (2) is installed above the frame (1), a grain feeding hopper (3) is connected above the filter device (2), a dust removal assembly (4) is connected to one side of the filter device (2), a conveyor belt (5) is provided below the dust removal assembly (4), a shelling assembly (6) is connected to one side of the dust removal assembly (4), the bottoms of the dust removal assembly (4) and the shelling assembly (6) are both fixed to the frame (1), a moving device (7) and a driving assembly (8) are also connected below the frame (1), and a plurality of positioning assemblies (9) are also connected to both sides of the frame (1).
2. A grain filter bucket for various terrains and wind directions according to claim 1, characterized in that: The filtering device (2) comprises a vibration motor (11), a filter box (12) and a discharge box (13); the filter box (12) is movably mounted on the frame (1) via a plurality of springs; the base of the vibration motor (11) is fixed to the two side walls of the filter box (12); a plurality of filter screens (14) for filtering impurities are arranged from top to bottom inside the filter box (12); a plurality of first cleaning holes (15) for cleaning impurities are arranged on the upper surface and the two side surfaces of the filter box (12); a plurality of second cleaning holes (16) for cleaning impurities are arranged on the top of the discharge box (13); first automatic impurity removal channels (17) are symmetrically arranged on the two side surfaces of the discharge box (13); a second automatic impurity removal channel (18) is symmetrically arranged on the bottom surface of the discharge box (13); and a discharge port (19) is welded to one side below the discharge box (13).
3. A grain filter bucket for various terrains and wind directions according to claim 2, characterized in that: A V-shaped buffer baffle (20) is provided inside the grain delivery hopper (3), and the upper end surface of the V-shaped buffer baffle (20) is directly opposite to the external grain conveyor belt. A square opening is provided at the bottom of the grain delivery hopper (3), and the square opening is located above the uppermost filter screen (14).
4. A grain filter bucket for various terrains and wind directions according to claim 2, characterized in that: The dust removal assembly (4) comprises a cyclone (21) and a dust removal box (22); a feed inlet (23) is provided on one side of the dust removal box (22); the feed inlet (23) corresponds to the position of the discharge port (19); the bottom of the dust removal box (22) is fixed to the top of the frame (1) by bolts; the cyclone (21) is fixed to the top of the dust removal box (22) by bolts and is connected to the top of the dust removal box (22); and a grain filtering outlet (24) is also provided at the bottom of the dust removal box (22).
5. A grain filter bucket for various terrains and wind directions according to claim 4, characterized in that: The shelling assembly (6) comprises a sedimentation box (31), a connecting pipe (32), a spiral impurity discharge pipe (33) and a first drive motor (34); a through hole is provided on one side of the sedimentation box (31) and is connected to the outlet of the cyclone (21); the bottom of the sedimentation box (31) is connected to the top of the connecting pipe (32); the bottom of the connecting pipe (32) is connected to the spiral impurity discharge pipe (33); a spiral blade and a rotating shaft are provided in the spiral impurity discharge pipe (33); the spiral blade is welded to the rotating shaft; the rotating shaft is connected to the first drive motor (34) via a belt; the base of the first drive motor (34) is fixed to the top of the frame (1) via bolts; and a plurality of square through holes for discharging dust are provided on the other side of the sedimentation box (31).
6. The grain filter bucket for various terrains and wind directions according to claim 1, characterized in that: The mobile device (7) comprises two terrain-simulating front wheels (41) and two terrain-simulating rear wheels (42); the terrain-simulating front wheels (41) are symmetrically distributed on the outside of the frame (1); the terrain-simulating rear wheels (42) are symmetrically distributed on the inside of the frame (1); the terrain-simulating front wheels (41) and the two terrain-simulating rear wheels (42) are respectively connected to the bottom end of the frame (1) via fixed brackets; the driving assembly (8) is connected to the mobile device (7) and is used to drive the mobile device (7) to move.
7. A grain filter bucket for various terrains and wind directions according to claim 6, characterized in that: The driving assembly (8) comprises an electric motor (51), a transmission mechanism (52), a battery pack (53), a steering wheel (54) and a seat (55); the electric motor (51) is fixed below the frame (1); the power generated by the electric motor (51) is transmitted to the terrain-imitation rear wheel (42) through the transmission mechanism (52); the battery pack (53) and the seat (55) are respectively fixed above the frame (1); and the steering wheel (54) is connected to the terrain-imitation front wheel (41) through the transmission mechanism (52).
8. The grain filter bucket for various terrains and wind directions according to claim 1, characterized in that: A plurality of guide shaft seats are provided on the side of the frame (1), and the positioning assembly (9) is movably connected to the frame (1) via the guide shaft seats. The positioning assembly (9) has a 7-shaped appearance, and the plurality of positioning assemblies (9) are symmetrically arranged along the center of the frame (1).
9. The grain filter bucket for various terrains and wind directions according to claim 1, characterized in that: The conveyor belt (5) further comprises a second drive motor (56) and a belt conveyor belt (57); the base of the second drive motor (56) is fixed on the frame (1); the bottom of the belt conveyor belt (57) is welded to the frame (1) via a bracket; and a windshield plate (58) is provided above the belt conveyor belt (57).