Concave plate sieve structure and combine

Abstract

This invention provides a concave plate screen structure and a combiner comprising two concave plate screens, a first concave plate screen with a product feeding opening and a second concave plate screen adjacent to the first concave plate screen in the product delivery direction, respectively. The inner screen surface of each concave plate screen is curved, and the axes of the two concave plate screens are parallel to each other and are fixed to the frame with a distance in the horizontal direction. Two concave plate sieves are formed with transfer ports respectively and communicate with each other through the transfer ports. The transfer plate sieve is located between the two transfer ports. The product feeding port is located on the side and opposite the transfer port and away from the transfer port of the first concave plate sieve, and the product conveying path from the product feeding port to the concave plate sieve is in the shape of the Chinese character "Qi". This structural design allows the arrangement of two concave plate screens to be compressed on the combine frame, improving the path of the crops through the threshing and screening of the concave plate screen, thereby greatly improving the overall mobility and threshing effect of the combine.

Description

Description Concave plate sieve structure and combine Technical background This invention relates to the technical field of agricultural machinery, in particular the structure of concave plate sieves and combines. Background knowledge The threshing system of a crawler combine can be divided into a longitudinal axis flow threshing and cleaning system and a horizontal axis flow threshing and cleaning system, and these two forms of threshing and cleaning systems are the main structural forms currently used in the market. The existing horizontal axis flow threshing and cleaning system is divided into a single drum horizontal axis flow threshing and cleaning system and a 1.5 drum horizontal axis flow threshing and cleaning system. In the case of the single drum, one drum is used for threshing, and the amount of products is only as large as one drum. In the 1.5 drum system, a feeding drum half the length of the single drum is added to the front of the single drum, that is, the extra half of the drum is only for continuous feeding of products, but rarely plays a role in threshing. Therefore, the existing horizontal axis flow threshing and cleaning system has a short threshing. The corresponding concave plate screen under the front drum is almost useless for screening. When dealing with difficult-to-thresh varieties, threshing and screening paths that are too short can easily lead to damage, as some of the nutritious grain exits the machine before it has time to be screened. Summary of the invention Therefore, the technical problem to be solved in this invention is to overcome the problem that the screening path of the concave plate screen of the drum is short and may easily lead to loss of products. According to an aspect of the present invention, there is provided a concave plate screen structure comprising: A frame; Two concave plate screens with curved inner screen surfaces are fixed parallel and axially and spaced apart in the horizontal direction on the frame, in which there is a gap between the inner screen surface of each concave plate screen and its corresponding drum. Conveying openings are formed in the radial direction at the same end of the frame on the two concave plate screens, and the two conveying openings are opposite and connected to each other. A transfer plate screen located between two concave plate screens and connecting the two transfer openings. A product feed opening is formed at the other end, opposite and away from the transfer opening, on one of the concave plate screens. Preferably, the axial length of the two concave plate sieves is the same. Each concave plate sieve includes the following: Two side protective plates that are respectively arched and axially positioned opposite each other. Two connecting legs that are located between the two side protection plates and connect the ends of the side protection plates together. A plurality of grid bars parallel to the connecting legs and fixed in an overlapping manner between two side protection plates, in which a plurality of holes are made through each of the grid bars at intervals. A large number of steel wires arranged parallel to the side protection plates and passing through holes in the mesh bars, where the two ends of the steel wires are fixed to the connecting base or mesh bars, respectively, and All the mesh bars and steel wires intersect to form a mesh screen surface. Preferably, in a plurality of grid cells formed by the intersection between all the grid bars and steel wires, the area of ​​each grid cell in the concave plate screen where the product feeding opening is located is smaller than the area of ​​the grid cell in the other concave plate screen. Preferably, all of the grid bars are uniformly spaced and fixed radially to the side guard plates. Preferably, all holes in each of the grid bars are evenly spaced. Preferably, the above concave plate sieve structure includes the following: A number of reinforcement supports positioned parallel to the side guard plates and fixed at intervals on the outer screen surface. Preferably, the transfer screen sieve comprises: A sieve frame in a square structure; A large number of mesh bars are arranged in the screen frame at a distance in the horizontal direction, in which a large number of holes are formed in each of the mesh bars at a distance, and A large number of steel wires arranged in the screen frame along the longitudinal direction and passing through the holes in the grid bars in order. Preferably, the grid bars are uniformly spaced in the screen frame and all holes in each grid bar are uniformly spaced. Preferably, all steel wires are evenly spaced in the screen frame and perpendicular to the mesh bars. According to another aspect of the present invention, the provided combine has the above concave plate screen structure. The technical solutions of this invention have the following advantages: The concave plate screen structure provided in this invention includes two concave plate screens, respectively, a first concave plate screen with a product feeding opening and a second concave plate screen adjacent to the first concave plate screen in the product delivery direction. The inner screen surface of each concave plate screen is curved, and the axes of the two concave plate screens are parallel to each other and are fixed to the frame with a distance in the horizontal direction. The two concave plate screens are respectively formed with transfer openings and communicate with each other through the transfer openings. The transfer plate screen is located between the two transfer openings. The product feeding opening is located on the side and opposite the transfer opening and away from the transfer opening of the first concave plate screen, and the product transfer path from the product feeding opening to the concave plate screen is in the shape of the Chinese character "Chi". This structural design makes the arrangement of two concave plate sieves compact on the combine frame, improving the path of crops through the threshing and screening of the concave plate sieve, thereby greatly improving the overall mobility and threshing effect of the combine. Brief description of the shapes In order to more clearly describe the technical solutions in the embodiments of this invention or the prior art, a brief introduction will be given below to the accompanying drawings that should be used in the description of the embodiments or in the prior art. It is clear that the figures described below are merely some of the embodiments of this invention. For those skilled in the art, other figures can be prepared without any creative effort in view of these figures. Figure 1 is a structural schematic diagram of a concave plate sieve structure in an embodiment of the present invention. Figure 2 is a first schematic diagram of the assembly structure of a concave plate screen structure in an embodiment of the present invention. Figure 3 is a second schematic diagram of the assembly structure of a concave plate screen structure in an embodiment of the present invention. Reference numbers: 1, frame; 11b, assembly base; 2b, first concave plate sieve; 21b, product feeding opening; 3b, second concave plate sieve; 4b, side protection plate; 41b, steel wire; 5b, connecting base; 51b, grid bar; 6b, transfer opening; 7b, transfer plate sieve; 8b, reinforcement support; 2a, primary drum; 3a, secondary drum; 2c, first drum cover; 3c, second drum cover. Detailed description of the embodiments The technical solutions of this invention, in combination with the accompanying figures, are clearly and completely explained below, and it is clear that the described embodiments are part of the embodiments of this invention. Based on the embodiments of this invention, all other embodiments obtained by persons skilled in the art without any creative effort are within the scope of protection of this invention. In describing this invention, it should be noted that the orientation or positional relationship indicated by terms such as “center,” “top,” “bottom,” “left,” “right,” “vertical,” “horizontal,” “inside,” “outside” is the orientation or positional relationship based on the accompanying figures. Such terms are merely for convenience in explaining this invention and simplifying the description and are not intended to indicate or imply that the device or part in question must be located in a particular orientation or must be constructed or operated in a particular orientation. Therefore, these terms should not be construed as a limitation on this invention. Furthermore, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In explaining this invention, it should be noted that unless otherwise specified and defined, terms such as "mounted", "connected" and "connection" should be understood in their broad sense, for example, the connection can be a fixed connection, a detachable connection or an integral connection, a mechanical connection or an electrical connection, a direct or indirect connection through an intermediary and a connection between two parts. For those skilled in the art, the specific meanings of the above terms in this invention can be understood with regard to the specific circumstances. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as no conflict arises between them. Visualization 1 This embodiment provides a concave plate screen structure comprising two concave plate screens, namely a first concave plate screen 2b with a product feeding opening 21b and a second concave plate screen 3b adjacent to the first concave plate screen 2b in the product delivery direction. The length of the first concave plate screen 2b is equal to the length of the second concave plate screen 3b, that is, the length of the screening area is the same. The inner screen surface of each concave plate screen is curved, and the axes of the two concave plate screens are parallel to each other and are fixed on the frame 1 with a distance in the horizontal direction. As shown in Figure 1, each concave plate screen structure includes two side protection plates 4b, two connecting legs 5b, a number of mesh bars 51b, a number of steel wires 41b and a number of reinforcing supports 8b. The two side protection plates 4b are respectively arcuate. The side protection plates 4b are coaxially arranged and opposite each other. The two end portions of the two side protection plates 4b are welded together and fixed through a connecting leg 5b, and the two side protection plates 4b and the two connecting legs 5b occupy the installation space. In this embodiment, the grid bars 51b are arranged parallel to the connecting legs 5b and are fixed between two side protection plates 4b in a circumferential manner, the distance between adjacent grid bars 51b is the same, and the grid bars 51b are arranged at uniform intervals along the side protection plate 4b and are distributed radially, that is, the plane in which each grid bar 51b is arranged intersects with the axis of the concave plate screen, and the center of the arc in which the side protection plate 4b is arranged is located on this axis.A large number of holes are formed uniformly and at intervals on each grid bar 51b. The steel wire 41b is arranged parallel to the side protection plate 4b and passes through the holes in each grid bar 51b respectively, and the two ends of the steel wire 41b are fixed on the connecting base 5b or the grid bar 51b respectively. All the grid bars 51b and the steel wires 41b intersect with each other to form grid cells, and all the grid cells together form a grid-like screen surface. In this embodiment, the reinforcing supports 8b are arranged parallel to the side protection plates 4b and are fixed at intervals on the outer screen surface. The grid bars 51b are welded and fixed to both sides of the side protection plates 4b, and the reinforcing supports 8b are welded and fixed to all the grid bars 51b. In this embodiment, the separation angles of the first concave plate sieve 2b and the second concave plate sieve 3b are both 180 degrees, that is, the entire side guard plate 4b is in the shape of a half arc. When the separation angle is set to more than 180 degrees, the space of the upper part of the concave plate sieve is wasted. Secondly, since the upper part is curved, the grains are thrown out of the concave plate sieve and are likely to fall into the concave plate sieve again when falling, affecting the cleaning result. When the separation angle is set to less than 180 degrees, the area of ​​the sieve area is reduced, which also affects the cleaning result. In this embodiment, the mesh cell area in the first concave plate sieve 2b is smaller than the mesh cell area in the second concave plate sieve 3b, so that only the crop grains pass through the first concave plate sieve 2b and the second concave plate sieve is suitable for passing grains and other small miscellaneous debris to prevent miscellaneous debris from being trapped in the grains and discharged through the straw outlet which may cause damage.In particular, when the distance between two adjacent mesh bars 51b in the two concave plate sieves is the same, the distance between two adjacent steel wires 41b in the second concave plate sieve 3b is greater than the distance between two adjacent steel wires 41b in the first concave plate sieve 2b, or when the distance between two adjacent steel wires 41b in the two concave plate sieves is the same, the distance between two adjacent mesh bars 51b in the second concave plate sieve 3b is greater than the distance between two adjacent mesh bars 51b in the first concave plate sieve 2b, or the distance between adjacent mesh bars 51b and adjacent steel wires 41b in the second concave plate sieve 3b is greater than the distance between adjacent mesh bars 51b and adjacent steel wires 41b in the first concave plate sieve 2b. Of course, the 41b steel wires in each concave plate sieve can all be stretched according to requirements to increase the mesh cell area. As shown in Fig. 1, two concave plate sieves are respectively formed with transmission openings 6b and communicate with each other through the transmission openings 6b. The transmission plate sieve 7b is placed between the two transmission openings 6b. The transmission plate sieve 7b includes a sieve frame, the sieve frame is in a square structure, and the mesh bars 51b are uniformly arranged in the sieve frame with a distance from each other in the horizontal direction. Similarly, a large number of holes are uniformly formed on each mesh bar 51b, and the steel wire 41b passes through the holes on the mesh bar 51b in the longitudinal direction, respectively. Among them, the width direction of the square sieve frame is horizontal and the length direction is longitudinal. The product feeding opening 21b is located next to the first concave plate sieve 2b, that is, opposite and away from the transfer opening 6b, and the product transfer path from the product feeding opening 21b to the concave plate sieve is in the shape of the Chinese letter "Chi". As shown in Figure 2, three assembly legs 11b are spaced apart on the frame 1, and the connecting legs 5b are overlapped on both sides of the first concave plate sieve 2b and fixed between the first and second assembly legs 11b. Similarly, the connecting legs 5b are overlapped on both sides of the second concave plate sieve and fixed between the second and third assembly legs 11b. The transfer opening 6b is placed close to one side of the frame 1. This structural design makes the layout of the two concave plate sieves on the combine frame 1 compact and improves the path of the crops through the threshing and screening of the concave plate sieve. As a result, it greatly improves the overall mobility and threshing effect of the combine. As shown in Figure 3, the first drum cover 2c and the first concave plate screen 2b enclose the first threshing space. The primary drum 2a is installed in the first threshing space, and there is a gap between the first concave plate screen 2b and the end plate of the primary drum 2a. The second drum cover 3c and the second concave plate screen 3b enclose the second threshing space, and with a gap between the second concave plate screen 3b and the end plate of the secondary drum 3a, the secondary drum 3a is installed in the second threshing space. The transfer port 6b communicates with the first and second threshing spaces, and the products enter the second threshing space through the transfer plate screen 7b from the first threshing space. Incarnation 2 This embodiment provides a combine that includes the concave plate screen structure of embodiment 1. It is understood that the above embodiments are merely examples for the purpose of clear description, and not for the purpose of limiting the embodiments. For those skilled in the art, other modifications or variations in various forms based on the above description can be made. It is unnecessary or impossible to enumerate all embodiments here. The obvious modifications or variations resulting therefrom remain within the scope of the invention.

Claims

Claims 1. A concave plate screen structure comprising: a frame (1); two concave plate screens, with an arcuate inner screen surface, fixed in parallel and axially and spaced apart in the horizontal direction on the frame (1) in which there is a gap between the inner screen surface of each of the concave plate screens and the corresponding drum. Conveying openings (6b) are formed in the radial direction at the same end of the frame on the two concave plate screens, and the two conveying openings (6b) are opposed to each other and connected to each other. A conveying plate screen (7b) is placed between the two concave plate screens and connects the two conveying openings (6b). A product feeding opening (21b) is formed at the other end, opposite to and away from the conveying opening (6b), on one of the concave plate screens.

2. The characteristic of the concave plate sieve structure according to claim 1 is that the axial length of the two concave plate sieves is the same.

3. The structure of the concave plate screen according to claim 1 is characterized in that each of the concave plate screens includes: two side protection plates (4b) in which the two plates are respectively curved and are axially and oppositely arranged. two connecting legs (5b) arranged between the two side protection plates (4b) and connecting the ends of the side protection plates (4b) together. a plurality of mesh bars (51b) arranged parallel to the connecting legs (5b) and fixed between the two side protection plates (4b) in a circumferential manner, in which a plurality of holes are formed in each of the mesh bars (51b) at a distance. A plurality of steel wires (41b) are respectively arranged parallel to the side protection plates (4b) and respectively pass through holes in the mesh bars (51b), where the two ends of the steel wires (41b) are respectively fixed to the connecting base (5b) or to the mesh bars (51b), and all the mesh bars (51b) and steel wires (41b) intersect each other to form a mesh screen surface.

4. The characteristic of the concave plate screen structure according to claim 3 is that in a large number of grid cells formed by the intersection between all the grid bars (51b) and steel wires (41b), the area of ​​each grid cell in the concave plate screen where the feeding opening (21b) is located is smaller than the area of ​​the grid cell in the other concave plate screen.

5. The concave plate screen structure according to claim 4 is characterized in that all the grid bars (51b) are uniformly spaced and radially fixed on the side guard plates (4b).

6. The concave sieve structure according to claim 3 is characterized in that all the holes in each of the grid bars (51b) are spaced evenly.

7. The structure of the concave plate screen of claim 3 is characterized in that the structure comprises: a number of reinforcing supports (8b) arranged parallel to the side protection plates (4b) and fixed at a distance on the outer screen surface.

8. The concave plate screen structure according to any one of claims 1-7 is characterized in that the transfer plate screen (7b) comprises: a screen frame in a square structure; a plurality of mesh bars (51b) arranged in the screen frame at a distance in the horizontal direction, in which a plurality of holes are formed in each of the mesh bars (51b) at a distance; and a plurality of steel wires (41b) arranged in the plate frame along the longitudinal direction and passing through the holes in the mesh bars (51b) respectively.

9. The characteristic of the concave plate screen structure of claim 8 is that the mesh bars (51b) are uniformly spaced in the screen frame, and all the holes of each mesh bar (51b) are uniformly spaced, and all the steel wires (41b) are uniformly spaced in the screen frame and perpendicular to the mesh bars (51b).

10. A combine characterized in that it has the concave plate screen structure of any one of claims 1-9.

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