A self-propelled cyperus chinensis combine harvester

Abstract

The present invention discloses a self-propelled cyperus chinensis combine harvester, belonging to the field of agricultural machinery technology. The harvester comprises a vehicle body, the front end of which is connected to a digging platform; a conveyor plate chain is provided on the digging platform, the rear end of which is connected to an elevator chain mechanism fixedly connected to the vehicle body; the rear end of the elevator chain mechanism extends into the front portion of a screen drum; a rotatable shaft is provided at the center of the screen drum; a plurality of grass guide blades and a plurality of throw ropes are connected to the shaft; a reciprocating vibrating screen is connected to the vehicle body below the screen drum; the outlet end of the berry elevator is located above a storage bin fixedly connected to the vehicle body; and a plurality of small sieve holes are formed on the collecting plate, the chain belt of the conveyor plate chain, and the chain belt of the elevator chain mechanism. While the space of the self-propelled vehicle body is limited, the present invention includes a five-stage screening mechanism, which has a strong soil screening capacity and can effectively screen out clods of soil carried by cyperus chinensis roots, thereby improving the efficiency and quality of cyperus chinensis harvesting.

Description

Technical Field

[0001] The invention belongs to the technical field of root crop harvesting and relates to a self-propelled cyperus juncea combine harvester. Background Art

[0002] Cyperus oleiferus, also known as cyperus oleiferus, tiger nut, and iron water chestnut, is an annual herbaceous plant belonging to the Cyperus family. It produces leaves above ground and fruits underground. The fruit is a granular, yellowish-brown tuber similar in shape and size to yam, making it a highly profitable new agricultural product. Cyperus oleiferus is a bounty of natural resources, easy to grow and manage, but difficult to harvest. Cyperus oleiferus fruit is attached to fibrous roots and, when mature, is found in the soil layer 50 to 100 mm above the ground. Manual harvesting requires pulling the plant out by hand, leaving the fibrous roots clinging to clumps of soil. If manual harvesting is used, 40% of sales are accounted for by harvesting costs, significantly reducing the economic benefits of cyperus oleifera cultivation. The primary limitation to large-scale cyperus oleifera cultivation is the difficulty and low efficiency of mechanical harvesting. Summary of the Invention

[0003] In order to overcome the shortcomings of the existing technology, the present invention provides a self-propelled cyperus juncea combine harvester, the purpose of which is to achieve low-loss excavation, efficient screening, cleaning and separation, and fruit collection. The device has the advantages of low fruit damage rate, clean cleaning, and high harvesting efficiency.

[0004] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions.

[0005] A self-propelled cyperus chinensis combine harvester comprises a vehicle body capable of moving independently, the front end of the vehicle body being connected to a digging platform for digging out a bean-soil mixture containing cyperus chinensis and soil clods; a conveyor plate chain is provided on the digging platform, the rear end of which is connected to an elevating chain mechanism fixedly connected to the vehicle body, for conveying the bean-soil mixture to the elevating chain mechanism via the conveyor plate chain; the rear end of the elevating chain mechanism extends into the front part of a screen drum, for conveying the bean-soil mixture to the screen drum; a rotatable shaft is provided at the center of the screen drum; a plurality of grass guide blades and a plurality of throw ropes are connected to the shaft, The swing rope is used to separate the fruit beans and rhizomes of the cyperus juncea from each other when the shaft rotates, and the grass guide is used to push the rhizomes to move toward the rear end of the screen drum when the shaft rotates; the screen drum is a single-walled screen drum with a plurality of evenly distributed large sieve holes on the wall so that the fruit beans can fall under the screen drum; under the screen drum, the vehicle body is connected to a vibrating screen that can swing back and forth, and the cyperus juncea beans fall directly onto the vibrating screen along the large sieve holes on the wall; the front part of the vibrating screen is provided with a plurality of evenly distributed small sieve holes, and the rear part is provided with a plurality of evenly distributed large sieve holes. The area of ​​the small sieve hole area accounts for three-quarters of the total area of ​​the vibrating screen; the guide plate with the bottom end fixedly connected to the vibrating screen and tilted forward is located below the vibrating screen and corresponds to the position of the small sieve holes of the vibrating screen, and is used to receive the impurities falling from the small sieve holes of the vibrating screen and discharge them out of the vehicle; the collecting plate with the bottom end fixedly connected to the vibrating screen and tilted forward has its rear end located below the large sieve holes of the vibrating screen and its front end located below the guide plate and corresponds to the top of the receiving trough of the bean elevator. The jatropha falling from the large sieve holes of the vibrating screen falls directly onto the collecting plate, which is used to collect the impurities falling from the vibrating screen. The fruit beans falling from the large sieve holes are collected and fall into the fruit bean elevator; the outlet end of the fruit bean elevator is located above the storage bin fixedly connected to the vehicle body, for conveying the fruit beans to the storage bin; it also includes a cleaning fan fixedly connected to the lower part of the vehicle body, the air outlet of the cleaning fan is located below the front end of the vibrating screen and faces the small sieve holes of the vibrating screen, and the air flow blown out by the cleaning fan flows through the small sieve holes and the screen drum of the vibrating screen in sequence; the collecting plate, the chain belt of the conveying plate chain, and the chain belt of the lifting chain mechanism are all provided with a plurality of small sieve holes for screening out soil mixed in the fruit beans.

[0006] As a further optimization, the upper end of the vibrating screen is fixedly connected to a plurality of serrated plates evenly spaced left and right; the length of the serrated plates is equal to that of the vibrating screen, and the tooth tips thereof face backwards.

[0007] As a further optimization, the outer wall of the screen drum is fixedly connected to a gear ring, which is meshed with a gear provided on the vehicle body. The gear is connected to a drive motor for driving the screen drum to rotate; the rotation direction of the screen drum is opposite to the rotation direction of the rotating shaft.

[0008] As a further optimization, a grass cutting knife is connected to the rear of the rotating shaft.

[0009] As a further optimization, the grass cutting blade is fixedly connected to a sleeve, the sleeve is sleeved on the rotating shaft, and one end of the sleeve is connected to the motor fixed on the vehicle body through a chain transmission mechanism.

[0010] As a further optimization, the small sieve holes are oblong holes; and the large sieve holes are circular holes.

[0011] As a further optimization, baffles are respectively provided on the left and right sides of the screen drum, and the baffles are fixedly connected to the vehicle body to prevent the fruit beans from falling outside the vibrating screen.

[0012] As a further optimization, the upper rear end of the excavation platform is hinged to the vehicle body, and the lower part is hinged to the cylinder. The other end of the cylinder is hinged to the vehicle body, which is used to control the digging depth of the front end of the excavation platform by extending and retracting the cylinder.

[0013] Compared with the prior art, the beneficial effects of the present invention are: under the condition of limited space on the self-propelled vehicle body, the present invention includes at least five-level screening mechanisms, has a strong soil screening ability, can effectively screen out the soil blocks and stems carried by the cyperus juncea, and improve the efficiency and quality of the cyperus juncea harvest. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic structural diagram of the entire machine according to an embodiment of the present invention;

[0015] Figure 2 This is a structural diagram of the digging platform and the lifting chain mechanism connected to each other in an embodiment of the present invention;

[0016] Figure 3 A schematic structural diagram of an excavation platform according to an embodiment of the present invention;

[0017] Figure 4 A schematic structural diagram of a screen drum according to an embodiment of the present invention;

[0018] Figure 5 Schematic diagram of the structure of the central rotating mechanism of an embodiment of the present invention;

[0019] Figure 6 It is a structural schematic diagram of a fruit soil cleaning device and a fruit collecting device according to an embodiment of the present invention.

[0020] The correspondence between the technical features and the reference numerals in the figure is: vehicle driving system 1; excavation and transportation system 2; root and fruit separation device 3; fruit and soil cleaning device 4; fruit collecting device 5; frame 6; rotary tillage device 7; conveyor plate chain 8; primary collecting device 9; lifting chain mechanism 10; transmission device 11; lifting arm 12; oil cylinder 13; rotary tillage blade pair 14; soil feeding shovel 15; rotating shaft 16; soil collecting shell 17; chain plate belt 18; transmission mechanism 19; triangular vibrating shaft 20; central rotating mechanism 21; screen drum 22; rotating shaft 23; grass guide blade 24; throwing rope 25; grass cutting blade 26; guide plate 28; collecting plate 29; vibrating screen 30; eccentric rocker 31; cleaning fan 32; secondary collecting device 33; fruit and bean elevator 34; storage bin 35; angle sensor 36; displacement sensor 37; torque sensor 38; control device 39. DETAILED DESCRIPTION

[0021] The present invention will be described clearly and completely below with reference to the accompanying drawings. It is apparent that the embodiments described are only some preferred embodiments of the present invention, rather than all embodiments. Those skilled in the art should understand that these embodiments are merely for explaining the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0022] Example 1: Please refer to Figure 1-6 In this embodiment, the forward direction of the vehicle body is regarded as the front.

[0023] A self-propelled cyperus chinensis combine harvester comprises a vehicle travel system 1, an excavation and transportation system 2, a root and fruit separation device 3, a fruit and soil cleaning device 4 and a fruit collection device 5. The coordinated operation of the multiple modules forms an efficient and sustainable combine harvesting equipment system.

[0024] The vehicle driving system 1, that is, the vehicle body including the cockpit, chassis system, and power system, is the key to the development of self-propelled harvesters.

[0025] The excavation and transportation system 2 includes an excavation platform, a frame 6, a rotary tillage device 7, a conveyor chain 8, a primary collection device 9, a lifting chain mechanism 10, and a transmission device 11. The frame 6 is used to fix and connect the rotary tillage device 7, the conveyor chain 8, the primary collection device 9, etc. The upper end of the frame 6 is fixedly connected to a lifting arm 12. The front end of the lifting arm is hinged to the conveyor chain 8 via a lifting shaft, so that the lifting shaft can be replaced after breaking or damaging, thereby protecting the life and reliability of the frame 6. The lower end of the lifting arm 12 is hinged to an oil cylinder 13, which is used to provide driving force to the lifting arm 12, thereby enabling the front end device to be raised or lowered. The frame 6 is connected to the rotary tillage device 7 for excavating the working area; the conveyor chain 8 is installed in the middle position of the frame 6 to transport the bean-soil mixture crushed by the rotary tillage device 7 to the rear end of the harvester, and the conveyor chain 8 has a chain plate belt 18 with small sieve holes for preliminary soil screening. After the initial screening, the bean-soil mixture is transported by conveyor chain 8 to a primary collection device 9. An auger within the device pulls the bean-soil mixture toward the center, where it falls from the lower outlet onto an elevator chain mechanism 10 (equipped with a fruit particle baffle). From there, it is transported along this mechanism to the rear-end root-fruit separation device 3. A drive motor is mounted on the center side of the frame 6, driving the various components of the front-end device through a transmission 11, ensuring stable operation.

[0026] The rotary tillage device 7 includes a pair of rotary tillage blades 14, a soil feed shovel 15, a rotating shaft 16 and a soil collecting housing 17. The pair of rotary tillage blades 14 are fixed on the rotating shaft 16, which is connected to the transmission assembly on the outside of the frame 6 and is connected to the drive motor to realize the reversal of the rotary tillage blades. The soil feed shovel 15 cooperates with the forward movement of the harvester to scoop up the bean-soil mixture crushed by the rotary tillage blades 14 and transport it to the conveyor plate chain 8. The soil collecting housing 17 gathers the bean-soil mixture and enables the soil feed shovel 15 to transport as much crop as possible, reducing the fruit leakage rate. At the same time, it can avoid as much as possible that debris such as jatropha plants or soil enters the transmission assembly, causing transmission blockage, damage to the mechanical device, and reduced harvesting efficiency. The conveyor plate chain 8 includes a chain belt 18, a transmission mechanism 19 and a triangular vibration shaft 20. The chain belt 18 is connected to a transmission mechanism 19 and driven by a drive motor, which drives it in a circular motion, transporting the bean-soil mixture to the rear end of the device. Small sieve holes are provided on the chain belt 18 to initially remove clods of soil and debris. A triangular vibrating shaft 20, connected to the drive motor via a transmission assembly, causes the chain belt 18 to oscillate up and down at high frequencies during transport, further removing clods of soil and debris. The triangular vibrating shaft 20 is conventional technology. Its principle involves the following: the main shaft of the triangular vibrating shaft 20 is mounted on the frame 6, onto which are mounted several triangular support frames. Rotatable rollers are mounted at each corner of the triangular support frames. As the main shaft rotates, the three rollers are driven to successively support the chain belt 18 as it passes overhead, causing it to vibrate. A monitoring unit and control system are installed at the location where the frame 6 is connected to the main body of the harvester. The monitoring unit includes an angle sensor 36 and a displacement sensor 37. The angle sensor 36 is used to measure the angle between the lifting arm and the vertical fixed surface of the harvester body, monitor the vertical posture of the front-end device, and determine the digging depth of the rotary tillage device 7. The displacement sensor 37 is used to monitor the horizontal offset of the front-end device frame 6 to ensure the linear stability of the harvester's operating path. The output ends of all sensors are electrically connected to the input ends of the control system to ensure real-time transmission of the collected signals. The control system adjusts the oil cylinder 13 at the lower end of the lifting arm 12 in real time based on the vertical posture information of the front-end device collected by the angle sensor 36 to ensure the digging depth of the rotary tillage device 7. The horizontal offset information of the frame collected by the displacement sensor 37 is fed back to the cockpit in real time to ensure that the driver (manually driven) or the direction control system (unmanned) can quickly adjust the vehicle's operating status. Monitoring and controlling the two-way posture of the front-end device can ensure the stable operation of the harvester's rotary tillage device and the automatic adjustment of the digging depth.

[0027] The root-fruit separation device 3 includes a central rotating mechanism 21 and a screen drum 22. As a screening system, its main function is to separate and screen the cyperus juncea from the stems, while also further screening out some clods of soil. The central rotating mechanism 21 consists of a rotating shaft 23, a grass guide 24, a rope 25, and a grass-chopping knife 26. After the bean-soil mixture is transported to the screen drum 22 by the lifting chain mechanism 10, the transmission assembly drives the rotating shaft 23 to rotate the central rotating mechanism 21. The rope 25 on the connecting rod of the rotating shaft 23 applies an impact force to the stems during rotation, separating the cyperus juncea from the stems. The scattered stems are pushed to the rear end of the screen drum 22 by the grass guide 24 for discharge. Considering that the stems are prone to blockage during the discharge process when the feed rate is large, a grass-chopping knife 26 is installed at the rear end of the rotating shaft 23 (i.e., the rear end of the screen drum 22). When a blockage occurs, the grass-chopping knife 26 motor is started to rotate at high speed to break up the blocked stems. The outer sieve drum 22 rotates at a constant speed, and the separated cyperus juncea, along with any clods of soil and small grass stems that remain unexpelled from the stems, falls onto the inner wall of the sieve drum 22. As the sieve drum 22 rotates, it falls into the fruit and soil cleaning device. A circular baffle is installed on the inner wall of the bottommost portion of the sieve drum 22 to prevent the cyperus juncea from falling outside the sieve drum 22 during the rolling process. Furthermore, a torque sensor 38 is installed on the root and fruit separation device 3. This sensor monitors the torque on the rotating shaft 23 to determine if there is any blockage and activates the motor of the grass cutter 26 in real time.

[0028] The fruit and soil cleaning device 4 includes a separation and screening system, a discharge plate 28, and a collection plate 29. The separation and screening system consists of a horizontal vibrating screen 30, an eccentric rocker 31, and a cleaning blower 32. A mixture of grass, soil, and cyperus juncea falls from the screen drum 22 onto the horizontal vibrating screen 30 below. The vibrating screen 30 is based on a grid design, divided axially into nine equal sections, with a serrated grid (i.e., a serrated plate) in the middle, and radially divided into four equal sections. The screen surface is perforated with unequal diameters. The front three-quarters of the surface have oblong holes, primarily for removing weeds and soil impurities. The rear quarter of the surface has holes slightly larger than the diameter of the cyperus juncea beans, ensuring that the berries fall to the collection plate 29 at the bottom. The vibrating screen 30 is vibrated back and forth at high frequency by an eccentric rocker 31 at the front. Both the vibrating screen 30 and the eccentric rocker 31 are conventional, and their vibration principle is similar to that of the vibrating screens used in existing wheat harvesters. During the vibration process, weeds and soil debris move toward the front of the screen, falling through the oblong holes onto the lower outlet plate 28 and directly into the field. Meanwhile, the jatropha moves toward the rear of the screen, falling through the rear apertures onto the collection plate 29 and entering the next stage. During the vibratory screening process, a cleaning blower 32 uses strong air to further remove weeds and soil from the mixture and remove them from the screening system. Furthermore, a control device 39 is installed at the front end of the eccentric rocker 31, and a visual recognition module is installed at the top of the vibrating screen 30. Based on the impurity content of the mixed material captured by the camera, the control device 39 adjusts the amplitude and frequency of the vibrating screen 30 in real time to ensure the efficiency and effectiveness of the screening system.

[0029] The fruit collection device 5 comprises a secondary collection device 33 (including a hopper for the fruit bean elevator 34), a fruit bean elevator 34, and a storage silo 35. The cyperus juncea stems, cleaned by screening from the fruit and soil cleaning device 4, fall onto the secondary collection device 33. An auger within the device transports the cyperus juncea to the fruit bean elevator 34 on the right side of the harvester. The cyperus juncea elevator 34, equipped with a baffle, transports the cyperus juncea beans in layers to the storage silo 35. The entrance to the storage silo 35 is sloped and fitted with rubber pads to ensure the integrity of the cyperus juncea beans entering the elevator 34 and minimize breakage. Furthermore, the elevator speed is adjusted in real time based on the amount of cyperus juncea beans fed into the berry elevator 34 to maximize efficiency.

[0030] It can be seen that the cyperus juncea harvester of this embodiment includes a vehicle body that can move independently, the front end of the vehicle body is connected to a digging platform for digging out a bean-soil mixture containing cyperus juncea and soil blocks; a conveyor plate chain 8 is provided on the digging platform, the rear end of which is connected to a lifting chain mechanism 10 fixedly connected to the vehicle body, for conveying the bean-soil mixture to the lifting chain mechanism 10 through the conveyor plate chain 8; the rear end of the lifting chain mechanism 10 extends into the front part of the screen drum 22, for conveying the bean-soil mixture to the screen drum 22; the A rotatable shaft 23 is provided at the center of the screen drum 22; a plurality of grass guides 24 and a plurality of ropes 25 are connected to the shaft 23, the ropes 25 being used to separate the fruit beans and rhizomes of the cyperus juncea when the shaft 23 rotates, and the grass guides 24 being used to push the rhizomes toward the rear end of the screen drum 22 when the shaft 23 rotates; a plurality of large sieve holes are evenly distributed on the wall of the screen drum 22, so that the fruit beans can fall under the screen drum 22; under the screen drum 22, the vehicle body is connected A vibrating screen 30 that can swing back and forth; a plurality of evenly distributed small sieve holes are opened at the front of the vibrating screen 30, and a plurality of evenly distributed large sieve holes are opened at the rear thereof; a guide plate 28 with a bottom end tilted forward and fixedly connected to the vibrating screen 30 is located below the vibrating screen 30 and corresponds to the position of the small sieve holes of the vibrating screen 30, and is used to receive impurities falling from the small sieve holes of the vibrating screen 30 and discharge them outside the vehicle; a collecting plate 29 with a bottom end tilted forward and fixedly connected to the vibrating screen 30, the rear end of which is located below the large sieve holes of the vibrating screen 30, and the The front end is located below the derivation plate 28 and corresponds to the receiving trough of the fruit bean elevator 34, and is used to collect the fruit beans falling from the large sieve holes of the vibrating screen 30 and collect them into the fruit bean elevator 34; the outlet end of the fruit bean elevator 34 is located above the storage bin 35 fixed to the vehicle body, and is used to transport the fruit beans to the storage bin 35; the collecting plate 29, the chain plate belt 18 of the conveying plate chain 8, and the chain plate belt 18 of the lifting chain mechanism 10 are all provided with a plurality of small sieve holes for screening out soil mixed in the fruit beans.

[0031] It should be noted that the excavation platform is equipped with a conveyor plate chain 8. The chain plate belt 18 of the conveyor plate chain 8 has small sieve holes, forming a primary screening mechanism, mainly used for screening soil. The chain plate belt 18 of the lifting chain mechanism 10 has small sieve holes, forming a secondary screening mechanism, mainly used for screening soil. The screen drum 22 has large sieve holes, forming a tertiary screening mechanism, mainly used for screening out the beans while retaining the stems; the stems are finally discharged from the rear end of the screen drum 22. The vibrating screen 30 has small sieve holes, forming a fourth-stage screening mechanism, mainly used for screening soil. The collection plate 29 has small sieve holes, forming a fifth-stage screening mechanism, mainly used for screening soil. The outlet plate 28 is mainly used to remove impurities with higher specific gravity, such as soil particles, stones, glass, and screws, to improve the cleanliness of the harvest.

[0032] Therefore, this embodiment has at least five levels of screening capability based on its self-propelled capability, and has a compact structure, reasonable layout, and strong screening capability. This embodiment can solve the problem of screening large amounts of soil clods adhering to the fibrous roots of Cyperus juncea, and can dig and harvest at the same time, achieving high operating efficiency.

[0033] To further enhance screening capacity, a cleaning fan 32 is attached to the lower portion of the vehicle body. Its outlet is located below the front end of the vibrating screen 30 and faces the small mesh openings of the vibrating screen 30. As can be seen, the airflow from the cleaning fan 32 flows sequentially through the small mesh openings of the vibrating screen 30 and the screen drum 22, discharging lightweight impurities such as stems, weeds, plastic sheeting, and ground soil powder from the vehicle, preventing them from reaching the collection plate 29. Essentially, the cleaning fan 32 serves as the sixth stage of screening, primarily used to remove lightweight impurities.

[0034] The upper end of the vibrating screen 30 is fixed with multiple serrated plates evenly spaced horizontally. These serrated plates are the same length as the vibrating screen 30, with their serrated tips facing rearward. This ensures a more even distribution of beans falling from the screen drum 22. Furthermore, the vibration gradually pushes impurities such as stems and stalks backward, preventing them from accumulating in the small mesh areas of the vibrating screen 30 and causing blockage. This also improves impurity removal.

[0035] To further enhance screening performance, the outer wall of the screen drum 22 is fixedly connected to a gear ring, which meshes with a gear mounted on the vehicle body. This gear is connected to a drive motor that drives the screen drum 22 to rotate. The direction of rotation of the screen drum 22 is opposite to that of the rotating shaft 23. This inverted rotation of the screen drum 22 increases the relative speed between the grass guide blades 24 and the swing rope 25, enhancing impact force, improving bean stem separation, and increasing stem removal efficiency, resulting in higher screening efficiency.

[0036] To facilitate independent control of the grass-chopping blades 26, the blades 26 are fixedly attached to a sleeve that fits over the rotating shaft 23. One end of the sleeve is connected to a motor mounted on the vehicle body via a chain drive mechanism 19. This allows for independent control of the grass-chopping blades 26, both on and off, and their rotational speed. This is achieved through flexible control based on parameters collected by the torque sensor 38, further improving anti-clogging capabilities and unclogging efficiency.

[0037] The area of ​​the small mesh area of ​​the vibrating screen 30 accounts for three-quarters of the total area of ​​the vibrating screen 30; correspondingly, the area of ​​the large mesh area of ​​the vibrating screen 30 accounts for one-quarter of the total area of ​​the vibrating screen 30. Thus, the area of ​​the small mesh area for screening soil is expanded, improving the screening capacity, and leaving one-quarter of the area as a fruit leakage area to ensure that the particles are stored in the bin.

[0038] The small sieve holes are oblong, which not only ensure that no fruit is leaked, but also increase the passability of the crushed soil and improve the soil screening efficiency. The large sieve holes are round, which ensures the passability of single fruit beans and also ensures the passability of multiple fruit beans stuck together.

[0039] To prevent beans from spilling, baffles are provided on both sides of the screen drum 22. The baffles are fixed to the body of the machine and are used to prevent the fruit beans from falling outside the vibrating screen 30. Preferably, the lower portion of the baffle extends toward the middle of the vibrating screen 30 to form a circular baffle, ensuring that all fruit beans fall into the vibrating screen 30.

[0040] If the digging platform digs too deep, not only will the digging load be excessive, but it will also increase the vehicle's forward resistance, leading to increased fuel consumption and reduced efficiency. If the digging platform digs too shallowly, the fruit will easily be lost, resulting in waste and a reduced harvest. Therefore, to ensure efficiency and prevent fruit loss, the upper rear end of the digging platform is hinged to the vehicle body, and its lower end is hinged to a cylinder 13. The other end of the cylinder 13 is hinged to the vehicle body. The extension and retraction of the cylinder 13 controls the digging depth at the front end of the digging platform, thereby controlling the amount of soil excavated and preventing fruit loss.

[0041] In summary, under the condition of limited space on the self-propelled vehicle body, this embodiment includes a five-stage screening mechanism, has a strong soil screening ability, can effectively screen out the soil blocks carried by the roots of cyperus juncea, and improve the efficiency and quality of cyperus juncea harvest.

[0042] The parts of the present invention that are not described in detail are prior art. For ordinary technicians in this field, the technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A self-propelled cyperus juncea combine harvester, comprising a self-propelled vehicle body, characterized in that: The front end of the vehicle body is connected to an excavating platform for digging out a bean-soil mixture containing cyperus oleiferus and soil clods; a conveying plate chain (8) is provided on the excavating platform, the rear end of which is connected to a lifting chain mechanism (10) fixedly connected to the vehicle body; the rear end of the lifting chain mechanism (10) extends into the front part of a screen drum (22) mounted on the vehicle body; a rotatable rotating shaft (23) is provided at the center of the screen drum (22); a plurality of grass guide blades (24) and a plurality of throwing ropes (25) are connected to the rotating shaft (23), and the throwing ropes (25) are used to beat the fruit beans and rhizomes of the cyperus oleifera to separate them when the rotating shaft (23) rotates; the screen drum (22) is a single-walled screen drum, and a plurality of evenly distributed large sieve holes are opened on the wall of the drum; Below the screen drum (22), the vehicle body is connected to a reciprocating vibrating screen (30), and the jatropha beans fall directly onto the vibrating screen (30) along the large sieve holes on the drum wall; the front of the vibrating screen (30) is provided with a plurality of evenly distributed small sieve holes, and the rear thereof is provided with a plurality of evenly distributed large sieve holes; the area of ​​the small sieve holes of the vibrating screen (30) accounts for three-quarters of the total area of ​​the vibrating screen (30); a guide plate (28) with a bottom end tilted forward and fixed to the vibrating screen (30) is located below the vibrating screen (30). and corresponding to the position of the small sieve holes of the vibrating screen (30); a collecting plate (29) with a bottom end tilted forward and fixedly connected to the vibrating screen (30), the rear end of which is located below the large sieve holes of the vibrating screen (30), and the front end of which is located below the derivation plate (28) and corresponding to the top of the receiving trough of the bean elevator (34), so that the jatropha falling from the large sieve holes of the vibrating screen (30) directly falls onto the collecting plate (29); the outlet end of the bean elevator (34) is located above the storage bin (35) fixedly connected to the vehicle body; It also includes a cleaning fan (32) fixedly connected to the lower part of the vehicle body, wherein the air outlet of the cleaning fan (32) is located below the front end of the vibrating screen (30) and faces the small sieve holes of the vibrating screen (30), and the air flow blown out by the cleaning fan (32) flows through the small sieve holes of the vibrating screen (30) and the sieve drum (22) in sequence; The collecting plate (29), the chain plate belt of the conveying plate chain (8), and the chain plate belt of the lifting chain mechanism (10) are all provided with a plurality of small sieve holes for screening soil.

2. The self-propelled cyperus juncea combine harvester according to claim 1, characterized in that: The upper end of the vibrating screen (30) is fixedly connected to a plurality of sawtooth plates evenly spaced to the left and right; the length of the sawtooth plates is the same as that of the vibrating screen (30), and the tips of the teeth face backwards.

3. The self-propelled cyperus juncea combine harvester according to claim 1, characterized in that: The outer wall of the sieve drum (22) is fixedly connected to a gear ring, and the gear ring is meshed with a gear provided on the vehicle body. The gear is connected to a drive motor for driving the sieve drum (22) to rotate; the rotation direction of the sieve drum (22) is opposite to the rotation direction of the rotating shaft (23).

4. The self-propelled cyperus juncea combine harvester according to claim 1, characterized in that: The rear portion of the rotating shaft (23) is connected to a grass-chopping blade (26).

5. The self-propelled cyperus juncea combine harvester according to claim 4, characterized in that: The grass-chopping blade (26) is fixedly connected to a sleeve, and the sleeve is sleeved on the rotating shaft (23), and one end of the sleeve is connected to a motor fixed to the vehicle body through a chain transmission mechanism (19).

6. The self-propelled cyperus juncea combine harvester according to claim 1, characterized in that: The small sieve holes are oblong holes; the large sieve holes are round holes.

7. The self-propelled cyperus juncea combine harvester according to claim 1, characterized in that: Baffles are respectively provided on the left and right sides of the screen cylinder (22), and the baffles are fixed to the vehicle body and are used to prevent fruit beans from falling outside the vibrating screen (30).

8. The self-propelled cyperus juncea combine harvester according to claim 1, characterized in that: The upper rear end of the excavating platform is hinged to the vehicle body, and the lower part is hinged to the oil cylinder (13). The other end of the oil cylinder (13) is hinged to the vehicle body, and is used to control the excavation depth of the front end of the excavating platform by extending and retracting the oil cylinder (13).

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