A reciprocating vibration three-layer grain cleaning screen, cleaning mechanism and harvester

Abstract

The present invention relates to a reciprocating vibrating three-layer grain cleaning screen, a cleaning mechanism and a harvester. The reciprocating vibrating three-layer grain cleaning screen comprises an upper grain screen assembly, a middle grain screen assembly, a lower grain screen assembly, a driving rod, a first connecting rod assembly and a second connecting rod assembly. The upper grain screen assembly, the middle grain screen assembly and the lower grain screen assembly are sequentially arranged from top to bottom; the driving rod is connected through the first connecting rod assembly and drives the upper grain screen assembly and the middle grain screen assembly to reciprocate back and forth, and the middle grain screen assembly is connected to the lower grain screen assembly through the second connecting rod assembly and drives the lower grain screen assembly to reciprocate back and forth. By setting the upper, middle and lower three-layer grain cleaning screen, the grains can be reciprocated and vibrated three times, and the residues are separated from the grains three times, which effectively prolongs the separation process of the grains and the residues. The residues and the grains are fully screened and shaken through the reciprocating motion, so that the residues and the grains are quickly separated, the grain loss rate is reduced, and the cleanliness of the grains in the granary is improved.

Description

Technical Field

[0001] The present invention relates to the technical field related to agricultural machinery, and in particular to a reciprocating vibration three-layer grain cleaning screen, a cleaning mechanism and a harvester. Background Art

[0002] With the development of agricultural mechanization in China, the development technology of agricultural machinery is becoming more and more mature. The existing combine harvesters on the market have the problem that the grains (corn grains, etc.) are not completely separated from the debris and are excluded from the machine. This is mainly due to the low efficiency of the harvester's cleaning screen, the high content of debris in the grains, and the large grain loss. Summary of the invention

[0003] In order to solve one or more technical problems existing in the prior art, the present invention provides a reciprocating vibrating three-layer grain cleaning screen, a cleaning mechanism and a harvester.

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a reciprocating vibrating three-layer grain cleaning screen, comprising an upper grain screen assembly, a middle grain screen assembly, a lower grain screen assembly, a driving rod, a first connecting rod assembly and a second connecting rod assembly, wherein the upper grain screen assembly, the middle grain screen assembly and the lower grain screen assembly are arranged in sequence from top to bottom; the driving rod is connected through the first connecting rod assembly and drives the upper grain screen assembly and the middle grain screen assembly to reciprocate back and forth, and the middle grain screen assembly is connected to the lower grain screen assembly through the second connecting rod assembly and drives the lower grain screen assembly to reciprocate back and forth.

[0005] The beneficial effects of the present invention are as follows: a reciprocating vibrating three-layer grain cleaning screen of the present invention can perform three reciprocating vibration cleaning on the grains by setting the upper, middle and lower three-layer grain cleaning screens, and the residues are separated from the grains three times, which effectively prolongs the separation process of the grains and residues, and the residues and grains are fully screened and shaken through the reciprocating motion, so that the residues and grains can be quickly separated better, the grain loss rate is reduced, and the cleanliness of the grains in the granary is improved.

[0006] Based on the above technical solution, the present invention can also be improved as follows.

[0007] Further, the first connecting rod assembly includes a first main support arm, a first connecting rod and a third connecting rod, the first main support arm is arranged obliquely, the front end of the driving rod is hinged to the upper part of the first main support arm, the middle part of the first main support arm is hinged to the frame, and the lower end of the first main support arm is hinged to the middle grain screen assembly; the first connecting rod is arranged horizontally and the front end is hinged to the upper end of the third connecting rod, the rear end is hinged to the upper end of the first main support arm, the lower end of the third connecting rod is hinged to the upper grain screen assembly, and the middle part of the third connecting rod is hinged to the frame.

[0008] The beneficial effect of adopting the above-mentioned further scheme is: by setting the first main support arm, the first connecting rod and the third connecting rod, the reciprocating motion of the driving rod can be used to drive the first main support arm to swing, and then the upper grain screen assembly can be driven to reciprocate through the first connecting rod and the third connecting rod, and the middle grain screen assembly can be driven to reciprocate through the first main support arm.

[0009] Further, the upper end of the first main arm is arranged to tilt forward, and the first main arm is installed on the left or right side of the upper grain screen assembly and the middle grain screen assembly; the middle part of the first main arm is provided with a first hinge hole and a second hinge hole arranged at intervals up and down, the front end of the driving rod is hinged in the first hinge hole, and the first main arm is hinged on the frame through the second hinge hole; The upper grain screen assembly is also hinged on the frame through a first hinge rod.

[0010] Furthermore, the second connecting rod assembly includes a second main support arm, a second connecting rod and a second articulated rod. The upper end of the second main support arm and the upper end of the second articulated rod are both arranged to tilt forward, and the second connecting rod is arranged transversely. The upper end of the second main support arm is hinged to the front end of the second connecting rod, and the rear end of the second connecting rod is hinged to the lower end of the second articulated rod. The lower end of the second articulated rod is also hinged to the middle grain screen assembly, and the upper end of the second articulated rod is hinged to the frame; the middle part of the second main support arm is hinged to the frame, and the lower end of the second main support arm is hinged to the lower grain screen assembly.

[0011] The beneficial effect of adopting the above further solution is that by providing the second main support arm, the second connecting rod and the second hinged rod, the lower grain screen assembly can be driven to reciprocate.

[0012] Furthermore, the rear end of the second connecting rod and the lower end of the second hinged rod are both hinged on the same hinged shaft on the middle grain screen assembly; The lower grain screen assembly is also hinged to the frame via a third hinge rod; The second connecting rod assembly is arranged front and rear of the first connecting rod assembly and is installed on the same side of the upper grain screen assembly and the middle grain screen assembly.

[0013] Further, the left and right sides of the upper grain screen assembly, the middle grain screen assembly and the lower grain screen assembly are each provided with a driving rod, a first connecting rod assembly and a second connecting rod assembly; the driving rod on the left side is arranged correspondingly to the driving rod on the right side, the first connecting rod assembly on the left side is arranged correspondingly to the first connecting rod assembly on the right side, and the second connecting rod assembly on the left side is arranged correspondingly to the second connecting rod assembly on the right side; Crank shafts are horizontally arranged on the left and right sides above the upper grain screen assembly, and both ends of the crank shaft are respectively hinged to the connecting ends of the driving rods on the left and right sides.

[0014] The beneficial effect of adopting the above further scheme is: by setting a crank shaft, the power source on one side is used to drive the driving rods and connecting rod assemblies on both sides for transmission, so that the left and right sides of the three-layer grain screening screen are reciprocatingly driven synchronously at the same time.

[0015] Furthermore, a circular assembly hole is provided at the connecting end of the driving rod, a bearing is provided in the circular assembly hole, a connecting key is provided at the end of the crank shaft, and the end of the crank shaft is vertically eccentrically connected to the bearing through the connecting key.

[0016] The beneficial effect of adopting the above further solution is that the transmission connection between the crank shaft and the bearing is facilitated by providing a connecting key.

[0017] A cleaning mechanism comprises the above-mentioned reciprocating vibrating three-layer grain cleaning screen, and also comprises a double-duct cleaning fan, wherein the double-duct cleaning fan is installed on the front side of the reciprocating vibrating three-layer grain cleaning screen, one air outlet of the double-duct cleaning fan is arranged toward the gap between the upper grain screen assembly and the middle grain screen assembly, and the other air outlet of the double-duct cleaning fan is arranged toward the gap between the middle grain screen assembly and the lower grain screen assembly.

[0018] The beneficial effects of the present invention are as follows: a cleaning mechanism of the present invention can fully screen and shake the debris and grains through reciprocating motion, so as to quickly separate the debris from the grains, and then separate the grains from the debris with a double-duct fan, thereby reducing the grain loss rate and improving the cleanliness of the grains in the granary.

[0019] Furthermore, a debris auger bin and a grain auger bin are provided below the lower grain screen assembly. The debris auger bin is located at the rear side of the grain auger bin. The front half of the bottom of the lower grain screen assembly is connected to the grain auger bin through a first channel, and the rear half of the bottom of the lower grain screen assembly is connected to the debris auger bin through a second channel.

[0020] A harvester comprises a harvester body, on which the above-mentioned cleaning mechanism is installed.

[0021] The beneficial effects of the present invention are as follows: the harvester of the present invention can quickly and effectively separate the grains from the debris, and the cleanliness inside the harvester body is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic side view of the structure of the reciprocating vibrating three-layer grain cleaning screen of the present invention; Figure 2 It is a side structural schematic diagram of the cleaning mechanism of the present invention; Figure 3 It is a schematic diagram of the top view of the cleaning mechanism of the present invention.

[0023] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. upper grain screen assembly; 11. first hinge rod; 2. middle grain screen assembly; 21. second hinged rod; 3. lower seed screen assembly; 31. third hinged rod; 4. driving rod; 41. bearing; 42. driving pulley; 5. First connecting rod assembly; 51. First main arm; 52. First connecting rod; 53. Second hinge hole; 54. Third connecting rod; 6. second connecting rod assembly; 61. second main arm; 62. second connecting rod; 7. Crank shaft; 71. Connecting key; 8. Double air duct cleaning fan; 81. First air duct; 82. Second air duct; 9. Miscellaneous stirring warehouse; 91. Grain stirring warehouse. DETAILED DESCRIPTION

[0024] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0025] like Figure 1~Figure 3 As shown, a reciprocating vibrating three-layer grain cleaning screen of the present embodiment includes an upper grain screen assembly 1, a middle grain screen assembly 2, a lower grain screen assembly 3, a driving rod 4, a first connecting rod assembly 5 and a second connecting rod assembly 6, wherein the upper grain screen assembly 1, the middle grain screen assembly 2 and the lower grain screen assembly 3 are arranged in sequence from top to bottom; the driving rod 4 is connected through the first connecting rod assembly 5 and drives the upper grain screen assembly 1 and the middle grain screen assembly 2 to reciprocate back and forth, and the middle grain screen assembly 2 is connected to the lower grain screen assembly 3 through the second connecting rod assembly 6 and drives the lower grain screen assembly 3 to reciprocate back and forth.

[0026] The upper grain screen assembly 1, the middle grain screen assembly 2 and the lower grain screen assembly 3 of the present embodiment are parallel to each other during installation.

[0027] like Figure 1 and Figure 2As shown, the first connecting rod assembly 5 of the present embodiment includes a first main support arm 51, a first connecting rod 52 and a third connecting rod 54, the first main support arm 51 is arranged obliquely, the front end of the driving rod 4 is hinged to the upper part of the first main support arm 51, the middle part of the first main support arm 51 is hinged to the frame, and the lower end of the first main support arm 51 is hinged to the middle grain screen assembly 2; the first connecting rod 52 is arranged horizontally and the front end is hinged to the upper end of the third connecting rod 54, and the rear end is hinged to the upper end of the first main support arm 51, the lower end of the third connecting rod 54 is hinged to the upper grain screen assembly 1, and the middle part of the third connecting rod 54 is hinged to the frame. By setting the first main support arm, the first connecting rod and the third connecting rod, the first connecting rod and the third connecting rod can be arranged in parallel, and the first connecting rod, the first main support arm and the third connecting rod together form a parallel four-bar structure. The reciprocating motion of the driving rod can be used to drive the first main support arm to swing, and then the upper grain screen assembly can be driven to reciprocate through the first connecting rod and the third connecting rod, and the middle grain screen assembly can be driven to reciprocate through the first main support arm.

[0028] Specifically, the upper grain screen assembly 1 of the present embodiment includes an upper screen weld and an upper screen frame, wherein the upper screen weld is arranged in the upper screen frame, and the height can be adjusted in the upper screen frame. The middle grain screen assembly 2 includes a middle screen weld and a middle screen frame, wherein the middle screen weld is arranged in the middle screen frame, and the height can be adjusted in the middle screen frame. The lower grain screen assembly 3 includes a lower screen weld and a lower screen frame, wherein the lower screen weld is arranged in the lower screen frame, and the height can be adjusted in the lower screen frame. The screening of different crops can also be achieved by replacing the upper screen weld, the middle screen weld or the lower screen weld.

[0029] like Figure 1 and Figure 2 As shown, the upper end of the first main arm 51 of this embodiment is arranged to tilt forward, and the first main arm 51 is installed on the left or right side of the upper grain screen assembly 1 and the middle grain screen assembly 2; the middle part of the first main arm 51 is provided with a first hinge hole and a second hinge hole 53 arranged at intervals up and down, the front end of the driving rod 4 is hinged in the first hinge hole, and the first main arm 51 is hinged on the frame through the second hinge hole 53; like Figure 1 and Figure 2 As shown, the upper grain screen assembly 1 of this embodiment is also hinged to the frame via a first hinge rod 11 .

[0030] like Figure 1 and Figure 2As shown, the second connecting rod assembly 6 of this embodiment includes a second main arm 61, a second connecting rod 62, and a second hinged rod 21. The upper end of the second main arm 61 and the upper end of the second hinged rod 21 are arranged forwardly and tilted, and the second connecting rod 62 is arranged transversely. The upper end of the second main arm 61 is hinged to the front end of the second connecting rod 62, and the rear end of the second connecting rod 62 is hinged to the lower end of the second hinged rod 21. The lower end of the second hinged rod 21 is also hinged to the middle grain screen assembly 2, and the upper end of the second hinged rod 21 is hinged to the frame; the middle part of the second main arm 61 is hinged to the frame, and the lower end of the second main arm 61 is hinged to the lower grain screen assembly 3. By arranging the second main arm, the second connecting rod, and the second hinged rod, the lower grain screen assembly can be driven to reciprocate.

[0031] like Figure 1 and Figure 2 As shown, the rear end of the second connecting rod 62 and the lower end of the second hinged rod 21 of this embodiment are both hinged on the same hinged shaft on the middle grain screen assembly 2; like Figure 1 and Figure 2 As shown, the lower grain screen assembly 3 of this embodiment is also hinged on the frame through a third hinge rod 31; like Figure 1 and Figure 2 As shown, the second connecting rod assembly 6 and the first connecting rod assembly 5 of this embodiment are arranged front and back and are installed on the same side of the upper grain screen assembly 1 and the middle grain screen assembly 2.

[0032] like Figure 3 As shown, the left and right sides of the upper grain screen assembly 1, the middle grain screen assembly 2 and the lower grain screen assembly 3 of this embodiment are provided with a driving rod 4, a first connecting rod assembly 5 and a second connecting rod assembly 6; the driving rod 4 on the left side and the driving rod 4 on the right side are arranged correspondingly, the first connecting rod assembly 5 on the left side and the first connecting rod assembly 5 on the right side are arranged correspondingly, and the second connecting rod assembly 6 on the left side and the second connecting rod assembly 6 on the right side are arranged correspondingly; like Figure 3 As shown, crankshafts 7 are arranged horizontally on the left and right sides of the upper grain screen assembly 1 of this embodiment, and the two ends of the crankshaft 7 are respectively hinged to the connecting ends of the driving rods 4 on the left and right sides. By setting the crankshaft, the driving rods and connecting rod assemblies on both sides are driven by the power source on one side, so that the left and right sides of the three-layer grain screening screen are synchronously driven to and fro at the same time.

[0033] like Figure 1 and Figure 2As shown, the connecting end of the driving rod 4 of this embodiment is provided with a circular assembly hole, a bearing 41 is provided in the circular assembly hole, and a connecting key 71 is provided at the end of the crankshaft 7, and the end of the crankshaft 7 is vertically eccentrically connected to the bearing 41 through the connecting key 71. By providing the connecting key, the transmission connection between the crankshaft and the bearing is facilitated.

[0034] In this embodiment, a driving pulley 42 is used to drive the crankshaft 7 to reciprocate.

[0035] A reciprocating vibrating three-layer grain cleaning screen of this embodiment can be composed of a crankshaft, a driving rod and two connecting rod assemblies to form a crank rocker mechanism through the first connecting rod assembly and the second connecting rod assembly, and the three grain screen assemblies are driven by the crankshaft to reciprocate forward and backward and up and down. Among them, the middle grain screen assembly drives the lower grain screen assembly to reciprocate forward and backward and up and down through the second connecting rod assembly. The movement direction of the lower grain screen assembly is opposite to the movement direction of the middle grain screen assembly, and the movement direction of the upper grain screen assembly is opposite to the movement direction of the middle grain screen assembly.

[0036] When the reciprocating vibrating three-layer grain cleaning screen of this embodiment is working, the grains and debris fall from the threshing and separation drum and fall onto the upper grain screen assembly (moving from back to front). The grains and debris are separated by the upper and lower reciprocating motion of the upper grain screen assembly, and the grains and small-particle debris quickly fall onto the middle grain screen assembly, while the large-particle debris and mixed grains fall onto the middle grain screen assembly through the upper grain screen assembly (moving from front to back). The upper secondary screening screens the grains and a small amount of debris through the middle grain screen assembly to the lower grain screen assembly, and most of the debris is screened out of the vehicle backwards. The lower grain screen assembly (moving from back to front) sends the grains to the grain push system through three screenings and finally reaches the granary, and a small amount of debris is sent to the debris recovery mechanism and returns to the threshing and separation drum. This working process undergoes three reciprocating vibration cleanings and three separations of debris from grains. At the same time, the debris and grains are transported to the middle grain screen assembly and the lower grain screen assembly within the same distance size through the upper grain screen assembly for reciprocating motion, which effectively prolongs the separation process of grains and debris. The reciprocating motion allows the debris and grains to be fully screened and shaken, which allows the debris to be quickly separated from corn kernels, reduces the grain loss rate, and improves the cleanliness of the grains in the granary.

[0037] A reciprocating vibrating three-layer grain cleaning screen in the present embodiment can perform three reciprocating vibration cleaning on the grains by arranging the upper, middle and lower three-layer grain cleaning screens, and the residues are separated from the grains three times, which effectively prolongs the separation process of the grains and residues. The residues and the grains are fully screened and shaken through the reciprocating motion, which can better and quickly separate the residues from the grains, reduce the grain loss rate, and improve the cleanliness of the grains in the granary.

[0038] like Figure 2 and Figure 3As shown, a cleaning mechanism of this embodiment includes the above-mentioned reciprocating vibrating three-layer grain cleaning screen, and also includes a double-duct cleaning fan 8, the double-duct cleaning fan 8 is installed on the front side of the reciprocating vibrating three-layer grain cleaning screen, one air outlet of the double-duct cleaning fan 8 is arranged toward the gap between the upper grain screen component 1 and the middle grain screen component 2, and the other air outlet of the double-duct cleaning fan 8 is arranged toward the gap between the middle grain screen component 2 and the lower grain screen component 3. The double-duct cleaning fan 8 includes a first air duct 81 and a second air duct 82, the first air duct 81 corresponds to the first air outlet, and the second air duct 82 corresponds to the other second air outlet. The cleaning mechanism of this embodiment, on the basis of the reciprocating vibrating three-layer grain cleaning screen, is further equipped with a double-duct cleaning fan to separate grains and debris, thereby reducing the grain loss rate and improving the cleanliness of the grains in the granary.

[0039] like Figure 2 As shown, a debris auger bin 9 and a grain auger bin 91 are further provided below the lower grain screen assembly 3 of the present embodiment, the debris auger bin 9 is located at the rear side of the grain auger bin 91, the bottom front half of the lower grain screen assembly 3 is connected with the grain auger bin 91 through a first channel, and the bottom rear half of the lower grain screen assembly 3 is connected with the debris auger bin 9 through a second channel.

[0040] The dual-duct cleaning fan 8 of this embodiment is powered by a continuously variable speed pulley device, and cleaning of different crops can be achieved by adjusting the fan speed.

[0041] Wherein, a lower recovery shell is welded below the lower grain screen assembly 3. In this embodiment, a dual-duct cleaning fan is arranged, and the dual-duct cleaning fan is assembled to the bottom of the frame. The rotation speed of the dual-duct cleaning fan is adjusted by a stepless speed pulley assembly, thereby increasing or decreasing the air volume to achieve the harvest of different crops. The debris dropped by the middle grain screen assembly and the lower grain screen assembly can be effectively cleaned, making the grain in the granary cleaner, thereby reducing the impurity content in the grains.

[0042] The material cleaning process of the cleaning mechanism of this embodiment is as follows: the material containing grains and debris falls from above onto the upper grain screen assembly, and the material is screened back and forth by the upper grain screen assembly and blown by the double-duct fan, and the grains and large-particle debris are screened back and forth and fall onto the middle grain screen assembly, and the small-particle debris is blown out of the vehicle, and the middle grain screen assembly screens back and forth again, and screens out the large-particle debris from the rear side to the outside of the vehicle, and blows the small-particle debris out of the vehicle, and the grains and debris with a particle size similar to that of the grains fall onto the lower grain screen assembly, and the lower grain screen assembly reciprocates back and forth, screens the grains forward and enters the grain auger bin through the first channel, and screens the debris backward and enters the debris auger bin through the second channel. The debris in the debris auger bin returns to the drum again and enters the cleaning mechanism for reselection.

[0043] A cleaning mechanism of the present embodiment can fully screen and shake the debris and grains through reciprocating motion, so as to quickly separate the debris from the grains, and then separate the grains from the debris by a double-duct fan, thereby reducing the grain loss rate and improving the cleanliness of the grains in the granary.

[0044] A harvester according to the present embodiment comprises a harvester body, on which the above-mentioned cleaning mechanism is installed.

[0045] The harvester of this embodiment can separate the grains from the debris quickly and effectively, and the cleanliness inside the harvester body is better.

[0046] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0048] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0051] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A reciprocating vibrating three-layer grain cleaning screen, characterized in that: It includes an upper grain screen assembly, a middle grain screen assembly, a lower grain screen assembly, a driving rod, a first connecting rod assembly and a second connecting rod assembly. The upper grain screen assembly, the middle grain screen assembly and the lower grain screen assembly are arranged in sequence from top to bottom; the driving rod is connected through the first connecting rod assembly and drives the upper grain screen assembly and the middle grain screen assembly to reciprocate back and forth, and the middle grain screen assembly is connected to the lower grain screen assembly through the second connecting rod assembly and drives the lower grain screen assembly to reciprocate back and forth.

2. A reciprocating vibrating three-layer grain cleaning screen according to claim 1, characterized in that: The first connecting rod assembly includes a first main arm, a first connecting rod and a third connecting rod. The first main arm is arranged obliquely, the front end of the driving rod is hinged to the upper part of the first main arm, the middle part of the first main arm is hinged to the frame, and the lower end of the first main arm is hinged to the middle grain screen assembly; the first connecting rod is arranged horizontally and the front end is hinged to the upper end of the third connecting rod, the rear end is hinged to the upper end of the first main arm, the lower end of the third connecting rod is hinged to the upper grain screen assembly, and the middle part of the third connecting rod is hinged to the frame.

3. The reciprocating vibrating three-layer grain cleaning screen according to claim 2, characterized in that: The upper end of the first main arm is arranged to tilt forward, and the first main arm is installed on the left or right side of the upper grain screen assembly and the middle grain screen assembly; the middle part of the first main arm is provided with a first hinge hole and a second hinge hole arranged at intervals up and down, the front end of the driving rod is hinged in the first hinge hole, and the first main arm is hinged on the frame through the second hinge hole; The upper grain screen assembly is also hinged on the frame through a first hinge rod.

4. A reciprocating vibrating three-layer grain cleaning screen according to any one of claims 1 to 3, characterized in that: The second connecting rod assembly includes a second main support arm, a second connecting rod and a second articulated rod. The upper end of the second main support arm and the upper end of the second articulated rod are both arranged to tilt forward, and the second connecting rod is arranged transversely. The upper end of the second main support arm is hinged to the front end of the second connecting rod, and the rear end of the second connecting rod is hinged to the lower end of the second articulated rod. The lower end of the second articulated rod is also hinged to the middle grain screen assembly, and the upper end of the second articulated rod is hinged to the frame; the middle part of the second main support arm is hinged to the frame, and the lower end of the second main support arm is hinged to the lower grain screen assembly.

5. A reciprocating vibrating three-layer grain cleaning screen according to claim 4, characterized in that: The rear end of the second connecting rod and the lower end of the second hinged rod are both hinged on the same hinged shaft on the middle grain screen assembly; The lower grain screen assembly is also hinged to the frame via a third hinge rod; The second connecting rod assembly is arranged front and rear of the first connecting rod assembly and is installed on the same side of the upper grain screen assembly and the middle grain screen assembly.

6. The reciprocating vibrating three-layer grain cleaning screen according to claim 1, characterized in that: The upper grain screen assembly, the middle grain screen assembly and the lower grain screen assembly are provided with a driving rod, a first connecting rod assembly and a second connecting rod assembly on the left and right sides; the driving rod on the left and the driving rod on the right are arranged correspondingly, the first connecting rod assembly on the left and the first connecting rod assembly on the right are arranged correspondingly, and the second connecting rod assembly on the left and the second connecting rod assembly on the right are arranged correspondingly; Crank shafts are horizontally arranged on the left and right sides above the upper grain screen assembly, and both ends of the crank shaft are respectively hinged to the connecting ends of the driving rods on the left and right sides.

7. A reciprocating vibrating three-layer grain cleaning screen according to claim 6, characterized in that: A circular assembly hole is provided at the connecting end of the driving rod, a bearing is provided in the circular assembly hole, a connecting key is provided at the end of the crank shaft, and the end of the crank shaft is vertically eccentrically connected to the bearing through the connecting key.

8. A cleaning mechanism, characterized in that: It comprises a reciprocating vibrating three-layer grain cleaning screen as described in any one of claims 1 to 7, and also comprises a double-duct cleaning fan, wherein the double-duct cleaning fan is installed on the front side of the reciprocating vibrating three-layer grain cleaning screen, one air outlet of the double-duct cleaning fan is arranged toward the gap between the upper grain screen assembly and the middle grain screen assembly, and the other air outlet of the double-duct cleaning fan is arranged toward the gap between the middle grain screen assembly and the lower grain screen assembly.

9. A cleaning mechanism according to claim 8, characterized in that: A debris auger bin and a grain auger bin are also provided below the lower grain screen assembly. The debris auger bin is located at the rear side of the grain auger bin. The front half of the bottom of the lower grain screen assembly is connected to the grain auger bin through a first channel, and the rear half of the bottom of the lower grain screen assembly is connected to the debris auger bin through a second channel.

10. A harvester, characterized in that: It comprises a harvester body, on which the cleaning mechanism according to claim 8 or 9 is installed.

Images