Concave grid and threshing cylinder

Abstract

The utility model relates to the technical field of crop screening, in particular to a concave grid and a threshing roller, which comprise an arc-shaped frame, the arc-shaped frame comprises a first straight plate, a first arc-shaped plate, a second straight plate and a second arc-shaped plate which are sequentially connected end to end, and the concave grid further comprises a penetrating strip, a plurality of rotating holes are sequentially formed in the first arc-shaped plate and the second arc-shaped plate respectively along arc-shaped paths of the first arc-shaped plate and the second arc-shaped plate, the rotating holes in the first arc-shaped plate and the rotating holes in the second arc-shaped plate are arranged in a one-to-one correspondence mode and jointly install the penetrating strips, and the penetrating strips can rotate in the rotating holes. The concave plate sieve can reduce the breakage rate when materials are sieved.

Description

Technical Field

[0001] The utility model relates to the technical field of crop screening, and particularly relates to a concave screen and a threshing cylinder. Background Technique

[0002] A combine harvester generally adopts a fixed concave screen device. The concave screen generally consists of an upper cross plate 1', a lower cross plate 3', a partition plate 9', side plates (2', 4'), a through strip 5', etc. Among them, the concave screen for harvesting rice and wheat is in the style of vertical through strips, and the concave screen for harvesting miscellaneous grains such as soybeans and corn is in the style of horizontal through strips. Designing a horizontal through strip concave screen in which the through strip and the partition plate can move relative to each other can reduce the breakage rate and improve the threshing and separating ability.

[0003] As Figure 1 shown, taking the concave screen in the style of horizontal through strips as an example, the horizontal through strips of the concave screen cannot rotate relative to the support plate and the side plates. When screening materials, under the repeated impacts and rubbings of the threshing rod teeth of the axial flow cylinder, grains, glumes, and broken straws are effectively screened, but the impact and rubbing forces are relatively large, and the breakage rate is relatively high.

[0004] Disadvantages of the prior art:

[0005] The through strips of the concave screen are fixedly arranged on the side plates and cannot move, and there is no relative movement when screening materials, so the breakage rate is relatively high. Content of the Utility Model

[0006] The purpose of the utility model is to provide a concave screen which can reduce the breakage rate when screening materials.

[0007] Another purpose of the utility model is to provide a threshing cylinder which can reduce the breakage rate when screening materials.

[0008] The technical solution of the utility model is realized as follows:

[0009] A concave screen includes an arc-shaped frame. The arc-shaped frame includes a first straight plate, a first arc plate, a second straight plate, and a second arc plate that are sequentially connected end to end. It further includes through strips. A plurality of rotation holes are sequentially arranged along the arc paths on the first arc plate and the second arc plate respectively. The rotation holes on the first arc plate and the rotation holes on the second arc plate are arranged in one-to-one correspondence and jointly install the through strips, and the through strips can rotate in the rotation holes.

[0010] Furthermore, both ends of the through strip are respectively located in the rotation holes on the first arc plate and the rotation holes on the second arc plate, and a limiting component is arranged on the through strip to axially limit the through strip.

[0011] Furthermore, the limiting component includes at least two limiting pieces;

[0012] The limiting members are respectively arranged on both sides of the first arc-shaped plate on the strip.

[0013] Alternatively, the limiting members are respectively arranged on both sides of the second arc-shaped plate on the strip.

[0014] Alternatively, the limiting members are arranged on at least one side of the first arc-shaped plate on the strip, and at the same time, the limiting members are arranged on at least one side of the second arc-shaped plate on the strip.

[0015] Further, the limiting members are snap rings, and a plurality of slots for installing the snap rings are arranged on the strip, and the slots and the snap rings are arranged in one-to-one correspondence.

[0016] Further, the limiting members are respectively arranged on the inner sides of the first arc-shaped plate and the second arc-shaped plate on each strip.

[0017] Further, at least one reinforcing support plate is arranged between the first arc-shaped plate and the second arc-shaped plate. A plurality of rotating holes are arranged on the reinforcing support plate. The rotating holes on the reinforcing support plate and the rotating holes on the first arc-shaped plate and the second arc-shaped plate are arranged in one-to-one correspondence and jointly install the strip.

[0018] Further, the reinforcing support plate is an arc-shaped plate and has the same radian as the first arc-shaped plate and the second arc-shaped plate.

[0019] Further, the cross-sectional shape of the strip is oval, the cross-sectional shape of the rotating hole is oval, and the strip and the rotating hole are in clearance fit.

[0020] Alternatively, the cross-sectional shape of the strip is oval, the cross-sectional shape of the rotating hole is circular, and the inner diameter of the rotating hole is not less than the maximum diameter of the strip.

[0021] Further, a plurality of bolt holes are respectively arranged on the first straight plate and the second straight plate for bolt connection with the threshing cylinder.

[0022] A threshing cylinder includes a threshing body, an axial flow cylinder, a cylinder cover, and also includes the concave sieve described above.

[0023] Compared with the prior art, the beneficial effects of the present utility model are:

[0024] In this application, a plurality of rotation holes are respectively arranged on the first arc plate and the second arc plate, and each through strip passes through and is installed in a pair of corresponding rotation holes on the first arc plate and the second arc plate. In this way, a plurality of through strips can be installed between the first arc plate and the second arc plate for screening materials. When screening materials, under the repeated impact and rubbing of the threshing teeth of the axial flow drum, grains, glumes, broken straw, etc. are effectively screened. Since each through strip can rotate in its corresponding rotation hole during screening, the force on the grains during impact and rubbing can be relatively dispersed, thereby achieving efficient screening and reducing the breakage rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0026] Figure 1 is a schematic structural diagram of a concave screen in the prior art;

[0027] Figure 2 is a schematic structural diagram of the concave screen of the present invention;

[0028] Figure 3 For the present invention Figure 2 is a partial enlarged view of the structure at A in the present invention;

[0029] Figure 4 For the present invention Figure 2 is a partial enlarged view of the structure at B in the present invention;

[0030] Figure 5 is a schematic structural diagram of the threshing drum of the present invention.

[0031] In the figure:

[0032] 1 - first straight plate; 2 - first arc plate; 3 - second straight plate; 4 - second arc plate; 5 - through strip; 6 - rotation hole; 8 - retaining ring; 9 - reinforcing support plate; 10 - concave screen; 11 - threshing body; 12 - axial flow drum; 13 - drum cover. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Components of the embodiments of the present utility model described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0036] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0037] In addition, terms such as "horizontal", "vertical", "hanging" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0038] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected to" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0039] The following will describe in detail some embodiments of the present utility model in conjunction with the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0040] Embodiment 1

[0041] As Figures 2 - 4 , this embodiment provides a concave screen 10 for screening materials, which includes an arc-shaped frame. The arc-shaped frame includes a first straight plate 1, a first arc plate 2, a second straight plate 3, and a second arc plate 4 that are sequentially connected end to end. It also includes a through-bar 5. A plurality of rotating holes 6 are sequentially arranged along the arc paths on the first arc plate 2 and the second arc plate 4 respectively. The rotating holes 6 on the first arc plate 2 and the rotating holes 6 on the second arc plate 4 are arranged in one-to-one correspondence and jointly install the through-bar 5. Each through-bar 5 passes through and is installed in a pair of corresponding rotating holes 6 on the first arc plate 2 and the second arc plate 4 respectively, and the through-bar 5 can rotate within the rotating holes 6.

[0042] Preferably, the first arc plate 2 and the second arc plate 4 are the same and are arranged sequentially along the axial direction of the through-bar 5. Since both the first arc plate 2 and the second arc plate 4 are arc-shaped, a plurality of rotating holes 6 are sequentially arranged along their own arc paths. A pair of corresponding rotating holes 6 on the first arc plate 2 and the second arc plate 4 are used to jointly install a through-bar 5. The two end portions of the through-bar 5 are respectively located in the rotating holes 6 on the first arc plate 2 and the rotating holes 6 on the second arc plate 4. The through-bar 5 is movably connected to the rotating holes 6 and there is a gap therebetween, so the two can rotate relative to each other.

[0043] Since a plurality of rotating holes 6 are arranged along the own arc paths on the first arc plate 2 and the second arc plate 4, then a plurality of through-bars 5 can be arranged between the first arc plate 2 and the second arc plate 4. The plurality of through-bars 5 are arranged parallel to each other and are sequentially arrayed along the arc path. A sieve gap for screening materials is formed between two adjacent through-bars 5.

[0044] In this embodiment, at least one reinforcing support plate 9 is arranged between the first arc plate 2 and the second arc plate 4. A plurality of rotating holes 6 are arranged on the reinforcing support plate 9. The rotating holes 6 on the reinforcing support plate 9 are arranged in one-to-one correspondence with the rotating holes 6 on the first arc plate 2 and the rotating holes 6 on the second arc plate 4 and jointly install the through-bar 5, that is, each through-bar 5 sequentially passes through the rotating holes 6 on the first arc plate 2, the rotating holes 6 on each reinforcing support plate 9, and the rotating holes 6 on the second arc plate 4. The reinforcing support plate 9 plays a role of strengthening the support, and at the same time can connect the middle parts of all the through-bars 5 and strengthen the support, improving the structural strength of the middle part of the through-bar 5, and effectively preventing the middle part of the through-bar 5 from being crushed and collapsed by materials; the reinforcing support plate 9 is equivalent to a reinforcing rib and is a reinforcing rib that can rotate relative to the through-bar 5.

[0045] In this embodiment, the reinforcing support plate 9 is an arc-shaped plate and has the same radian as the first arc-shaped plate 2 and the second arc-shaped plate 4. Three reinforcing support plates 9 are arranged between the first arc-shaped plate 2 and the second arc-shaped plate 4, as Figure 2 shown. It should be noted that the number of the reinforcing support plates 9 between the first arc-shaped plate 2 and the second arc-shaped plate 4 can be designed according to actual needs. In this way, each strip 5 passes through the rotation holes 6 on the first arc-shaped plate 2, then passes through the rotation holes 6 on the three reinforcing support plates 9 in sequence, and then passes through the rotation holes 6 on the second arc-shaped plate 4 to realize the threading and installation of the strip 5. Both ends of the reinforcing support plate 9 are fixedly connected to the first straight plate 1 and the second straight plate 3 respectively, such as the two ends of the reinforcing support plate 9 are fixedly connected to the first straight plate 1 and the second straight plate 3 by means of bolt connection or welding.

[0046] In order to prevent the strip 5 from having axial displacement after installation or the amplitude of axial displacement being too large and disengaging from the first arc-shaped plate 2 or the second arc-shaped plate 4, a limiting component is arranged on the strip 5 to axially limit the strip 5.

[0047] Specifically, the limiting component includes at least two limiting pieces. Regarding the setting and layout of the limiting pieces, an explanation is given here: Since each plate body has two opposite sides, the two sides of the first arc-shaped plate 2 are respectively defined as the first position and the second position, the two sides of the first reinforcing support plate 9 are respectively defined as the third position and the fourth position, the two sides of the second reinforcing support plate 9 are respectively defined as the fifth position and the sixth position, the two sides of the third reinforcing support plate 9 are respectively defined as the seventh position and the eighth position, and the two sides of the second arc-shaped plate 4 are respectively defined as the ninth position and the tenth position. It should be noted that along the axial direction of the strip 5, the first position to the tenth position are arranged in sequence. Since at least two limiting pieces need to be set, in order to axially limit the strip 5, the limiting pieces can be set at at least two positions among the first position to the tenth position, and the setting mode of the limiting pieces on each strip 5 can also be different.

[0048] In summary, due to too many design situations of the limiting pieces, the following are several preferred ways of setting the limiting pieces:

[0049] The first way: The limiting pieces are respectively arranged on both sides of the strip 5 and located on the first arc-shaped plate 2, that is, the limiting pieces are respectively arranged at the first position and the second position;

[0050] The second way: The limiting pieces are respectively arranged on both sides of the strip 5 and located on the second arc-shaped plate 4, that is, the limiting pieces are respectively arranged at the ninth position and the tenth position;

[0051] The third way: The limiting member is arranged on at least one side of the strip 5 and located at least one side of the first arc-shaped plate 2. Meanwhile, the limiting member is arranged on at least one side of the strip 5 and located at least one side of the second arc-shaped plate 4.

[0052] The fourth way: The limiting member is arranged on at least one side of the strip 5 and located at least one side of the first arc-shaped plate 2. Meanwhile, the limiting member is respectively arranged on at least one side of the strip 5 and located at least one side of any one of the reinforcing support plates 9.

[0053] The fifth way: The limiting member is arranged on at least one side of the strip 5 and located at least one side of the second arc-shaped plate 4. Meanwhile, the limiting member is respectively arranged on at least one side of the strip 5 and located at least one side of any one of the reinforcing support plates 9.

[0054] The sixth way: The limiting member is arranged on at least one side of the strip 5 and located at least one side of the first arc-shaped plate 2. Meanwhile, the limiting member is respectively arranged on at least one side of the strip 5 and located at least one side of any one of the reinforcing support plates 9.

[0055] In the actual production of the concave screen 10, for the convenience of mass production and improvement of production efficiency, the setting method of the limiting member on each strip 5 is the same, and the setting method of the limiting member on each strip 5 adopts the above-mentioned third way, and the limiting members are respectively arranged on the inner side of the first arc-shaped plate 2 and the inner side of the second arc-shaped plate 4, that is, the limiting members are set at the second position and the ninth position simultaneously to achieve axial limitation of the strip 5, as Figure 2 shown.

[0056] In this embodiment, the limiting member adopts a retaining ring 8, and a plurality of grooves for installing the retaining ring 8 are arranged on the strip 5. The grooves and the retaining ring 8 are arranged in one-to-one correspondence. Two grooves on each strip 5 respectively install the retaining ring 8. After the retaining ring 8 is installed, the retaining ring 8 at the second position abuts against the inner side wall of the first arc-shaped plate 2 or has a small gap (the gap is not more than 10 mm) with the first arc-shaped plate 2, and the retaining ring 8 at the ninth position abuts against the inner side wall of the second arc-shaped plate 4 or has a small gap (the gap is not more than 10 mm) with the second arc-shaped plate 4. Such a structural design can well axially limit the strip 5 and can avoid axial displacement of the strip 5.

[0057] In this embodiment, the cross-sectional shape of the strip 5 is oval, the cross-sectional shape of the rotating hole 6 is oval, and the size of the rotating hole 6 is larger than the size of the strip 5. The strip 5 and the rotating hole 6 are in clearance fit. Preferably, the cross-sectional shape of the strip 5 is exactly the same as the cross-sectional shape of the rotating hole 6, and the oval of the rotating hole 6 is formed by enlarging the oval of the strip 5 according to a certain ratio.

[0058] The concave plate screen 10 of the present embodiment is a concave plate screen 10 of the cross bar 5 style, and a plurality of bolt holes are respectively arranged on the first straight plate 1 and the second straight plate 3, and the bolt holes are used to install connecting bolts to realize bolt connection with the threshing drum.

[0059] Example 2

[0060] This embodiment provides a concave plate screen 10 for screening materials. The difference between it and the concave plate screen 10 in Example 1 is that the cross-sectional shape of the penetration strip 5 in this embodiment is elliptical, while the cross-sectional shape of the rotating hole 6 is circular, and the inner diameter of the rotating hole 6 is not less than the maximum diameter of the penetration strip 5.

[0061] Specifically, when the inner diameter of the rotating hole 6 is equal to the maximum diameter of the penetration strip 5 , the inner wall of the rotating hole 6 is a smooth surface, and the outer wall of the penetration strip 5 is also a smooth wall surface, and the penetration strip 5 can rotate smoothly in the rotating hole 6 .

[0062] When the inner diameter of the rotating hole 6 is larger than the maximum diameter of the penetration strip 5, there is no special requirement for the smoothness of the inner wall of the rotating hole 6 and the outer wall of the penetration strip 5. However, a bearing may be provided in the rotating hole 6, and the penetration strip 5 can smoothly rotate in the rotating hole 6 through the bearing. When the bearing is provided, it is only necessary to provide the bearing in the rotating hole 6 of the first arc plate 2 and the rotating hole 6 of the second arc plate 4, and no bearing is required in the rotating hole 6 on the reinforcing support plate 9.

[0063] Example 3

[0064] This embodiment provides a concave plate screen 10 for screening materials. The difference between this embodiment and the concave plate screen 10 in embodiment 1 is that in this embodiment, the penetration bars 5 are staggered and fixed, and not all penetration bars 5 are fixedly arranged, that is, among all penetration bars 5, some are rotatable and the other parts are fixed.

[0065] Example 4

[0066] A threshing drum, such as Figure 5 As shown, it includes a threshing machine body 11, an axial flow drum 12, a drum cover 13 and the concave plate screen 10.

[0067] Example 5

[0068] A harvester comprises the threshing drum.

[0069] The beneficial effects of the technical solution of the utility model are:

[0070] When the strip 5 is installed on the arc-shaped frame, it can rotate relative to the arc-shaped frame. When it is installed on the threshing cylinder of the harvester and used for screening materials, it can make the materials such as grains be relatively dispersed when being impacted and rubbed, so as to achieve efficient screening, with good screening effect and reduced breakage rate.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

[0072] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A concave sieve (10), comprising an arc-shaped frame, the arc-shaped frame including a first straight plate (1), a first arc plate (2), a second straight plate (3) and a second arc plate (4) that are connected in sequence from beginning to end, characterized in that, It further includes a strip (5). A plurality of rotation holes (6) are sequentially arranged along the arc paths on the first arc plate (2) and the second arc plate (4) respectively. The rotation holes (6) on the first arc plate (2) and the rotation holes (6) on the second arc plate (4) are arranged in one-to-one correspondence and jointly mount the strip (5). The strip (5) can rotate within the rotation holes (6).

2. The concave screen (10) according to claim 1, characterized in that, Both end portions of the strip (5) are respectively located within the rotation holes (6) on the first arc plate (2) and the rotation holes (6) on the second arc plate (4), and a limiting component is arranged on the strip (5) to axially limit the strip (5).

3. The concave sieve (10) according to claim 2, characterized in that, The limiting component includes at least two limiting members; The limiting members are respectively arranged on both sides of the first arc plate (2) on the strip (5); Or, the limiting members are respectively arranged on both sides of the second arc plate (4) on the strip (5); Or, the limiting members are arranged on at least one side of the first arc plate (2) on the strip (5), and at the same time, the limiting members are arranged on at least one side of the second arc plate (4) on the strip (5).

4. The concave sieve (10) according to claim 3, characterized in that, The limiting member adopts a retaining ring (8), and a plurality of card slots for mounting the retaining ring (8) are arranged on the strip (5). The card slots and the retaining ring (8) are arranged in one-to-one correspondence.

5. The concave sieve (10) according to claim 3, characterized in that, The limiting members are respectively arranged on the inner side of the first arc plate (2) and the inner side of the second arc plate (4) on each strip (5).

6. The concave screen (10) according to claim 1, characterized in that, At least one reinforcing support plate (9) is arranged between the first straight plate (1) and the second straight plate (3). A plurality of rotation holes (6) are arranged on the reinforcing support plate (9). The rotation holes (6) on the reinforcing support plate (9) and the rotation holes (6) on the first arc plate (2) and the rotation holes (6) on the second arc plate (4) are arranged in one-to-one correspondence and jointly mount the strip (5).

7. The concave sieve (10) according to claim 6, characterized in that, The reinforcing support plate (9) is an arc plate and has the same radian as the first arc plate (2) and the second arc plate (4).

8. The concave sieve (10) according to claim 1, characterized in that, The cross-sectional shape of the strip (5) is oval, the cross-sectional shape of the rotation hole (6) is oval, and the strip (5) and the rotation hole (6) are in clearance fit; Or, the cross-sectional shape of the strip (5) is oval, the cross-sectional shape of the rotation hole (6) is circular, and the inner diameter of the rotation hole (6) is not less than the maximum diameter of the strip (5).

9. The concave screen (10) according to claim 1, characterized in that, A plurality of bolt holes are respectively arranged on the first straight plate (1) and the second straight plate (3) for bolt connection with the threshing cylinder.

10. A threshing cylinder, comprising a threshing body (11), an axial flow cylinder (12), and a cylinder cover (13), characterized in that, It further includes a concave screen (10) according to any one of claims 1-9.

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