JP2010268729A - Threshing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a threshing machine including a receiving net for improving yield efficiency by preventing the stay of grains at the boundary part between a front threshing cylinder and a rear threshing cylinder, and reducing free grains. <P>SOLUTION: The receiving net 46 is divided into four regions by partitions 55, 56, and 57, and the opening areas of leaking holes 50, 51, and 52 are formed so as to reduce the opening areas according to the approach to the downstream side in the grain culm-conveying direction of from the front region F, through the intermediate region M to the rear region R. As a result, the leaked down product having good quality and containing little impurity leaks down from the front leaking holes 50 in the front region F having smallest opening areas. The intermediate region M is formed so as to span the boundary part between the front threshing cylinder and the rear threshing cylinder, and leaks the leaking product from the intermediate leaking holes 51 having the opening areas larger than those of the front leaking holes 50 at a speed not allowing the grains to stay at the boundary part of the threshing cylinders while keeping the prescribed quality. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a threshing machine mounted on a combine, a harvester or the like, and in particular, relates to the shape of the receiving net.

  In general, a threshing machine includes a handling room that rotates a handling cylinder to perform threshing, and a sorting room that sorts grains that have been threshed below the handling room and impurities such as broken rice cake. In addition, a receiving net is provided between the handling chamber and the sorting chamber so that foreign substances do not leak into the sorting chamber as much as possible. The receiving net is formed of a perforated plate having a large number of leakage holes. Conventionally, if a large amount of foreign substances and grains accumulate on the receiving net and the leakage hole is clogged, the threshing performance decreases. Therefore, the frame part that supports the receiving net is bent with respect to the perforated plate, the leakage hole is formed on the entire surface of the perforated plate, and a small hole is further provided at the front end portion of the perforated plate. A receiving network with improved capabilities has been devised (see Patent Document 1).

JP 2004-57117 A

  Increasing the number of leakage holes and small holes as described above not only improves the leakage ability, but also reduces the opening area of the leakage hole and may improve the quality of the leakage. However, if the size of the leakage hole is the same across the entire perforated plate as in Patent Document 1, the leakage ability and sorting ability of the receiving network are constant at any position.

  Usually, most of the grain is threshed at the entrance of the handling room, but at the same time as threshing, many trash and other foreign matter are generated, and in the threshed grain, twigs are attached. Grains with branch stems and ears are mixed. These contaminants and insufficiently selected grains are processed in the handling room while being sent to the downstream side in the grain conveyance direction and leak into the sorting room, but if the leakage hole of the receiving net is large, There is a possibility that impurities before processing such as large broken rice cakes and grains that have not been made into single grains may leak as they are into the sorting room from the front side of the receiving net. On the other hand, if the opening area of the receiving hole of the receiving net is too small, the grain will not be leaked from the receiving net and will be discharged from the handling room together with foreign substances, or the grains staying on the receiving net will be stuck into the cereal. May become scorpion grains.

  In particular, in the case of a so-called difference rate handling cylinder in which the handling cylinder is divided into front and rear in the grain conveying direction and the rotation speed of the front handling cylinder is slower than the rotation speed of the rear handling cylinder, these handling cylinders before and after these Due to the difference in rotation, grains and impurities are likely to stay at the boundary between the front handling cylinder and the rear handling cylinder, and the establishment of the above-described scorpion grains and damaged grains is increased by rolling up the accumulated grains. There was a problem.

  Therefore, the present invention selects the receiving net by increasing the opening area of the leakage hole of the receiving net at a position corresponding to the boundary between the front handling cylinder and the rear handling cylinder rather than the entrance side of the handling chamber. The purpose is to solve the above-mentioned problems by appropriately setting the ability and leakage ability according to the position.

The invention according to claim 1 is along the handling cylinder (16) for threshing the grain from the grain basket, the handling chamber (11) for rotatably supporting the handling cylinder (16), and the handling cylinder (16). And a receiving network (30, 70, 80) having a large number of leakage holes (50, 51, 52, 53, 71, 72, 73, 75, 81, 82, 83, 84). The handling cylinder (16) is divided into front and rear in the middle part in the grain conveying direction, and the inlet side of the handling chamber (11) which is upstream of the grain conveying direction among these two handling cylinders The rotational speed of the front barrel (16a) disposed on the rear side is higher than the rotational speed of the rear barrel (16b) disposed on the outlet side of the handling chamber (11), which is the downstream side in the grain conveying direction. In the slow threshing machine (5),
The opening area of the leakage hole (51) at a position corresponding to the boundary between the front handling cylinder (16a) and the rear handling cylinder (16b) is determined from the entrance side of the handling chamber (11). (16a) larger than the opening area of the leakage hole (50) formed over the middle part,
The threshing machine (5) is characterized by that.

The invention according to claim 2 provides at least one of the leakage holes (50, 51, 52, 53, 71, 72, 73, 75, 81, 82, 83, 84) of the receiving network (30, 70, 80). The part has a quadrangular shape or a hexagonal shape, and the direction of the diagonal line (l) is substantially coincident with the rotational direction (D) of the handling cylinder (16).
A threshing machine (5) according to claim 1.

The invention according to claim 3 is arranged in parallel with the handling chamber (11) and connected to the handling chamber (11) through an opening (26) provided on the outlet side of the handling chamber (11). A processing chamber (12) to perform,
A treatment cylinder (25) rotatably supported in the treatment chamber (12),
A length extending obliquely with respect to the rotational direction of the handling cylinder (16) through the leakage hole (53, 75, 84) of the receiving net (30, 70, 80) at a position corresponding to the opening (26) Hole shape,
It exists in the threshing machine (5) of Claim 1 or 2.

  In addition, although the code | symbol etc. in a parenthesis is for contrast with drawing, it does not have any influence on a claim by this.

  According to the first aspect of the present invention, the leakage hole on the front side of the receiving net is formed small so that untreated impurities and insufficiently selected grains are immediately transferred from the front side of the receiving net to the sorting chamber. In addition to preventing leakage, the leakage hole at the position corresponding to the boundary between the front handling barrel and the rear handling barrel has a larger opening area than the leakage hole on the front side and improves the leakage capability. While maintaining the quality of a certain leakage, it is possible to reduce the retention of grains and to improve the harvesting efficiency by suppressing the generation of scorpion grains and damaged grains.

  According to the second aspect of the present invention, the shape of the leakage hole of the receiving net is a quadrangular shape, and the diagonal line is formed so as to coincide with the rotation direction of the barrel. Can be made into a single grain by removing twigs such as grain of grains, twigs of ears, whiskers of wheat and the like. Moreover, since the corner | angular part which removes the said twigs etc. increases by making the shape of a leakage hole into a hexagonal shape, a grain can be singulated more efficiently.

  According to the invention of claim 3, the slant hole at a position corresponding to the opening of the handling chamber connected to the processing chamber is formed into a long hole extending obliquely with respect to the rotation direction of the handling cylinder. It is possible to efficiently send a mixture of grains and impurities threshed along the leakage hole extending to the downstream side in the grain conveying direction. Thereby, the impurities can be efficiently discharged from the handling chamber, and the efficiency of conveying the insufficiently selected grain from the opening to the processing chamber is improved.

The drive system figure of the combine carrying a threshing machine. A side view of a threshing machine. The perspective view of the chamber of a threshing machine. The side view of the handling room of a threshing machine. The perspective view which shows the state which removed the handling cylinder from the threshing machine. The perspective view which shows the installation state of the receiving net of a threshing machine. The top view of a receiving net. The top view which shows other embodiment of a receiving network. The top view which shows other embodiment of a receiving network.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the front, rear, left, and right directions in the description are considered based on the worker seated on the driver's seat.

<First Embodiment>
As shown in FIG. 1, a combine 1 includes a machine body 2 that travels on a farm field by a traveling device, a pretreatment unit 3 that is supported in front of the machine body 2 so as to be movable up and down, and that harvests cereals, and a pretreatment unit 3 A threshing machine 5 for threshing the cereals harvested by the threshing machine. It comprises a sorting unit 7 that sorts out contaminants such as broken rice cake, a Glen tank 9 that stores the selected grain, and a post-processing unit (not shown) that processes the waste.

  As shown in FIGS. 2 to 5, the threshing unit 6 is formed by a handling chamber 11 and a processing chamber 12 extending along the longitudinal direction of the machine body, and below the handling chamber 11 and the processing chamber 12. Is provided with a sorting chamber 13. On the side of the threshing machine 5, a feed chain 15 extending from the front to the rear of the machine body is provided. The cereals harvested by the pretreatment unit 6 described above are conveyed by the feed chain 15. The threshing is carried out by a handling cylinder 16 rotatably supported in the handling chamber 11, and the threshing is delivered to a rejecting chain 17 provided behind the feed chain 15 and processed by the post-processing unit.

  Next, the configuration of the threshing machine 5 will be described in detail. The handling cylinder 16 has a cylindrical shape that is long in the grain conveying direction (the longitudinal direction of the machine body), and on the outer periphery thereof, a straightening tooth 17 that aligns the directions of a plurality of grains and a tooth handling 19 for threshing. And are provided. Moreover, the handling cylinder 16 is divided into front and rear in the middle part thereof, and the support shafts 20 and 21 of these two handling cylinders 16a and 16b are entrances to the handling chamber 11 which is the front side in the grain conveying direction. The support shaft 20 of the front handle cylinder 16a provided on the 11a side is loosely fitted on the support shaft 21 of the rear handle cylinder 16b provided on the outlet side of the handling chamber 11 on the rear side in the grain conveying direction. It has a shaft structure (see FIG. 1). The gear ratio of the transmission gear between the support shaft 20 of the front handle cylinder 16a and the input shaft 23 to which power from the engine 22 is transmitted is set lower than the support shaft 21 of the rear handle cylinder 16b. The front handling cylinder 16a is configured to have a lower rotational speed than the rear handling cylinder 16b.

  In general, most of the grain (about 70 to 80 percent) is threshed at the front part of the barrel 16, and at the rear part, it is cerealed with branches, single grains of ear-cut grains, and waste of scorpion grains. Processing such as separation from chopping, subdivision of cut pieces and the like is performed. The handling cylinder 16 mainly suppresses the generation of damaged grains and the generation of foreign matters such as chopped grains by slowing down the rotational speed of the front handling cylinder 16a for mainly threshing, and is mainly a single grain. By increasing the number of rotations of the rear barrel 16b that performs the conversion and separation of the grains from the contaminants, the processing capacity of these grains and contaminants is improved.

  On the other hand, on the rear side of the processing chamber 11, a processing chamber 12 that rotatably supports the processing cylinder 25 is provided side by side. The processing chamber 11 and the processing chamber 12 are arranged on the front side of the processing chamber 12 and in the body width direction. They are connected via an opening 26 provided at the rear end (exit side) of the overlapping handling chamber 11. A processing net 27 made of a crimp net is provided along the processing cylinder 25 below the processing chamber 12, and a receiving net 30, which will be described in detail later, is provided below the processing chamber 11. From the receiving net 30 and the processing net 27, a mixture in which impurities such as threshed grains and broken rice cake are mixed leaks into the sorting chamber 13 of the sorting unit 7 as a leaking matter.

  As shown in FIG. 2, the sorting chamber 13 is provided with an oscillating flow plate 31 formed in a corrugated shape from the front end of the front handling cylinder 16a to the middle of the rear handling cylinder 16b. In addition, a chaff sheave 32 made up of a number of parallel fins whose opening degree can be adjusted is provided behind the oscillating flow plate 31. In addition, a red pepper fan 33 for raising the sorting air is provided below the oscillating flow plate 31, and the chaff sheave 32 is screened by the sorting air from the hot air fan 33 and the forward / backward swing. A separate grain sieve 35 is provided. The oscillating flow plate 31, the chaff sheave 32, and the grain sheave 35 are integrally formed with a frame, and the frame is connected to an oscillating means (not shown) so as to oscillate back and forth. As a whole, a rocking sorter for rocking and sorting grains is formed.

  A first port A for collecting the selected grain is provided below the grain sieve 35 and below the end of the receiving net 30, and the first port A receives the grain to the grain tank 9. A first spiral 37 to be conveyed is provided. In addition, on the rear side of the machine body of No. 1 A (downstream side in the grain conveying direction), No. 2 B is provided for collecting grains that are insufficiently selected with the turbo fan 39 interposed therebetween. In B, a second spiral 40 is provided for recirculating the recovered insufficiently sorted grains to the sorting chamber 13 and the processing chamber 12 again. Further, the dust is blown off to the rear side of the machine body by the sorting wind and is discharged to the outside by the suction fan 41.

  Next, the configuration of the receiving network 30 will be described in detail. As shown in FIG. 3 to FIG. 7, the receiving net 30 causes the grains to leak into the sorting chamber 13 and a number of leakage holes 50, 51, 52, 53 for removing foreign matters such as shards. Is composed of perforated plates 42, 43, 45 that are arranged in a plurality of rows and are formed in a mesh shape. By combining these three perforated plates 42, 43, 45 formed in a circular arc shape, It is a single semi-circular receiving net along the line.

  The receiving net 30 is supported by placing a frame portion 46 bent approximately 90 degrees with respect to the perforated plates 42, 43, 45 on a rail provided in the handling chamber 11. The leakage holes 50, 51, 52, 53 are formed on the entire surfaces of 42, 43, 45. In addition, three bow-shaped partition plates 55, 56, and 57 are formed on the inner peripheral surface of the receiving net 30 that faces the outer peripheral surface of the handling cylinder 16, and includes a front region F, a middle region M, and a rear region. It is divided into four areas, R and termination area G.

  The first partition plate 55 that defines the front region F is provided at a position corresponding to the rear side (intermediate portion) of the front handling cylinder 16a. The front region F has a number of rectangular leakages. The pilot holes 50 are formed in a plurality of rows and meshes. Further, the rectangular leakage hole 50 is provided so that its diagonal line 1 substantially coincides with the rotation direction D of the barrel, and removes twigs and the like attached to the grain at the corner portion 50a. It is configured to be able to. Further, the opening area of the leakage hole 50 is configured to be small so that chopped grains that have not been subdivided by the handling cylinder 16 and grains that have not been made into single grains are not leaked into the sorting chamber 13 without being processed. ing. In addition, since the leaking thing leaking from the front part area | region F leaks to the front side of the front separate chamber 13, the rate collect | recovered from the said 1st port A is higher than the leaking thing from another area | region.

  On the other hand, the middle region M is defined by a first partition plate 55 and a second partition plate 56 provided at a position corresponding to the front side of the rear handling cylinder 16b. Similarly, a large number of rectangular leakage holes 51 in which the rotation direction of the barrel 16 and the direction of the diagonal line thereof substantially coincide are provided. The handling cylinder 16 is divided into a front handling cylinder 16a and a rear handling cylinder 16b at a position corresponding to the middle part of the intermediate region, and straddles the boundary between the front handling cylinder 16a and the rear handling cylinder 16b. The middle leakage hole 51 of the middle region M is formed to have a larger opening area than the front leakage hole 50 of the front region F described above.

  Further, the rear region R is defined by a second partition plate 56 and a third partition plate 57 provided at a substantially intermediate position of the rear handle cylinder 16b, and includes a front region, an F region, and a middle region. As with M, a large number of rectangular leakage holes 52 in which the rotation direction of the handling cylinder 16 and the direction of the diagonal line thereof substantially coincide are provided. The rear leakage hole 52 provided in the rear region R is formed to have a larger opening area than the middle leakage hole 51 of the middle region M described above, and the leakage capability is reduced to the front leakage hole 50 and It is higher than the middle leakage hole 51. In other words, the opening area of the middle leakage hole 51 is smaller than the opening area of the rear leakage hole 52.

  Further, the end region G is defined by the third partition plate 57 and the end of the receiving net (the outlet 60 (exhaust port) of the handling chamber) and is inclined with respect to the rotation direction D of the handling cylinder 16. A plurality of elongated hole-shaped leakage holes 53 are formed. The termination region G is provided to face the opening 26 of the handling chamber 11 described above, and the termination leakage hole 53 is formed so as to be inclined obliquely toward the opening 26.

  As described above, the receiving net 30 increases the opening area of the leakage hole as it progresses downstream in the front region F, the middle region M, the rear region R, and the grain transporting direction (50 <51 <52). ), The front side of the receiving net 30 has a high grain sorting ability, and the rear side has a higher leakage ability than the sorting ability, and the middle part is intermediate between the front side and the rear side. With the sorting ability and leakage ability, it is configured to have a leakage ability that does not allow grains to stay at the boundary between the front handling cylinder 16a and the rear handling cylinder 16b while maintaining a certain level of leakage quality. ing.

  Actually, the front leakage hole 50 is formed by 10 mm square, the middle leakage hole 51 is formed by 12 mm square, the rear leakage hole 52 is formed by 14 mm square, and the middle leakage hole 51 is formed by 12 mm square. However, it can be set in a range larger than 10 mm square and smaller than 14 mm square. Further, these three regions are formed in the order of the middle region M, the front region F, and the rear region R so as to be long in the grain conveying direction E, and straddle the boundary between the front barrel 16a and the rear barrel 16b. The middle region M is the longest.

  Further, a portion corresponding to the opening 26 of the handling chamber 11 is a termination region G, and the shape of the leakage hole 53 of the termination region G is a long hole shape extending obliquely with respect to the rotation direction D of the handling cylinder 16. Thus, it is possible to improve the conveying ability of the grains and foreign substances, efficiently discharge the foreign substances from the handling chamber 11, and to send more unselected sorting grains to the processing chamber 12. ing.

  The perforated plates (receiving nets) 43 and 46 that form the front region F, the middle region M, and the rear region R use the same material, so that the versatility of the parts is improved and the left and right perforated plates are used. It is configured to be able to exchange.

  Next, the operation of the present invention will be described. The cereals harvested by the preprocessing unit 3 are transferred to the feed chain 15 and conveyed to the rear side of the machine body. When transported by the feed chain 15, the tip side enters the handling chamber 11 and is threshed by the front handling cylinder 16 a and the rear handling cylinder 16 b that rotate in the direction D orthogonal to the grain conveying direction E. These threshed grains fall onto the receiving net 30 and leak into the sorting chamber 13 together with the finely divided foreign matters such as broken straw. At this time, the grain or spikelet with a branch branch with a branch branch or the like attached thereto is formed in a square shape in which the teeth 19 of the handle cylinder and the diagonal line 1 thereof are substantially in the same direction as the rotation direction of the handle cylinder 16. The branch infarcts are removed by being caught in the corners 50a, 51a, 52a of the leaked holes 50, 51, 52, and leak into the sorting chamber 13 as single particles.

  Although many grains threshed by the front handling barrel 16a and foreign substances such as chopped grains fall along the front area F of the receiving net 30, the opening area of the front leakage hole 50 is small. Therefore, untreated impurities and non-single grains stay on the receiving net. From the leak hole 50, the cerealized grains leak into the sorting chamber 13, and the staying material is provided with a dust feeding plate (not shown) provided at a predetermined angle above the handling chamber 11. ) And the cereals to be transported are transported to the downstream side in the cereal transporting direction.

  On the other hand, in the middle region M behind the front region F, the retained matter transported from the front region F beyond the first partition plate 55 and the newly threshed grain are the same as in the front region F. In the middle of the conveyance, the grain is made into a single grain by the handling cylinder 16, in particular, the rear handling cylinder 16b having a high rotation speed, and also handles impurities such as broken rice cake. In the chamber 11, it is rotated together with the handling cylinder 16 and subdivided by the above-mentioned tooth handling 19 and the tooth cutting teeth 14. Since these single grains and processed impurities are smoothly leaked from the middle leakage hole 51 having a larger opening area than the front leakage hole 50 to the sorting chamber 13, the front handling cylinder Retained material such as grains hardly stays at the boundary between 16a and rear barrel 16b.

  Further, in the rear region R, a rear leakage hole 52 having an opening area larger than that of the middle leakage hole 51 is provided, and the remaining material transferred from the middle region M beyond the second partition plate 56 and newly Priority is given to letting the grain flow into the sorting room 13 over the front area F and the middle area M so that the threshed grain is not discharged outside the machine while processing the threshed grain. The subdivided contaminants and the cerealized grains are leaked from the rear leakage hole 52.

  In addition, the stagnant that has not leaked into the sorting chamber 13 in the rear region R is efficiently sent to the downstream side in the grain conveying direction by the obliquely biased long hole-shaped terminal leakage hole 53, Insufficiently selected grains are conveyed to the processing chamber 12 through the opening 26, and impurities are discharged from the discharge port 60 to the outside of the handling chamber.

  Even if the grains are rolled up and become scorpion grains while staying in the front area F, the grains are again dropped onto the receiving net by the rear handling cylinder 16b, and the middle area M or The rear region R leaks from the receiving network 30 where there is little stagnation to the sorting chamber 13.

  By configuring the receiving net 30 as described above, the sorting ability and leakage ability of the receiving net 30 are changed according to the conveying direction position of the grain straws, and the quality of the grains recovered in the glen tank 9 is changed. While improving, the grain discharged | emitted outside the machine without being collect | recovered can be reduced.

  Specifically, by reducing the opening area of the leakage hole 50 in the front region F, the grain with branches and branches included in the grain threshed on the front barrel 16a on the entrance side of the handling chamber 11, It is possible to prevent grains that have not been made into single grains, such as chopped grains, or large chopped grains that have not been subdivided, from leaking into the sorting chamber 13 before being processed by the handling cylinder 16. The quality of the grains leaking from the front region F can be improved. Further, by increasing the opening area of the leakage hole 52 in the rear region R, it is possible to reduce the grains discharged outside the machine. Further, the opening area of the leakage hole 51 in the middle region M between the front region F and the rear region R is set to a size intermediate between the front leakage hole 50 and the rear leakage hole 52, so that The grains staying at the boundary between the part handling cylinder 16a and the rear handling cylinder 16b can be eliminated, the generation of scorpion grains can be suppressed, and the quality of leakage can be maintained. Further, by forming the middle region M to be the longest, it is possible to maximize the leakage capability and sorting capability of the entire receiving network.

  Further, the end leakage hole 53 at a position corresponding to the opening 26 of the handling chamber 11 is formed in a long hole shape extending obliquely with respect to the rotation direction D of the handling cylinder 16, thereby processing grains that are insufficiently selected. While being able to send efficiently to the chamber 12, a foreign substance can be sent to the downstream side of the grain straw conveyance direction with little conveyance resistance, and it can be easily discharged from the handling chamber 11.

<Second Embodiment>
Next, a second embodiment will be described based on FIG. Since this embodiment is the same as the first embodiment except for the shape of the leakage hole of the receiving network, the description of the same configuration as the first embodiment is omitted, and the first embodiment The same name is used for the configuration corresponding to the embodiment.

  The receiving net 70 is divided into four areas of a front area F, a middle area M, a rear area R, and a termination area G by three bow-shaped partition plates. M, the opening areas of the leakage holes 71, 72, 73 are formed larger toward the downstream side of the rear region R and the grain conveying direction. Further, the leakage holes 71, 72, 73 of the front region F, the middle region M, and the rear region G are formed in a regular hexagonal shape, and the terminal leakage hole 75 of the terminal region G is the handling cylinder 16. It has a long hole shape extending obliquely with respect to the rotation direction.

  The leakage holes 71, 72, 73 in the front region F, the middle region M, and the rear region G are formed so that the rotation direction D of the handling cylinder 16 and the direction of the diagonal line 1 thereof are substantially coincident with each other. By adopting a regular hexagonal shape with more corners 71a, 72a, 73a than a quadrangular shape, it is possible to more efficiently remove grain twigs, wheat beards, and the like.

<Third Embodiment>
Next, a third embodiment will be described based on FIG. Since this embodiment is the same as the first embodiment except for the shape of the leakage hole of the receiving network, the description of the same configuration as the first embodiment is omitted, and the first embodiment The same name is used for the configuration corresponding to the embodiment.

  The receiving net 80 is configured by being divided into four regions, a front region F, a middle region M, a rear region R, and a terminal region G, by three bow-shaped partition plates 55, 56, and 57. As the area F, the middle area M, the rear area R, and the downstream side in the grain conveying direction, the opening areas of the leak holes 81, 82, 83 are formed larger. Further, the shape of these leakage holes 81, 82, 83 is a quadrangular shape in which the front region F is formed so that the direction of the diagonal line 1 substantially coincides with the rotation direction D of the handling cylinder 16, and the middle region M However, the longitudinal direction n is a rectangular shape substantially coincident with the grain conveying direction E, and the rear region R and the terminal region G are elongated holes extending obliquely with respect to the rotation direction D of the handling cylinder 16. Note that the leakage hole 83 in the rear region R is larger in width and shorter than the leakage hole 84 in the termination region G, and the rear leakage hole 83 has better leakage performance. The terminal leakage hole 84 is superior in grain feeding capability.

  As a result, the sorting capacity (processing capacity) is increased in the front area F, the leakage capacity and the conveyance capacity are increased in the rear area R, and the leakage capacity is intermediate between the front and rear areas in the middle area M. While maintaining the quality of the product, it is possible to eliminate stagnation of grains at the boundary between the front handling cylinder 16a and the rear handling cylinder 16b, and to suppress the generation of cassava grains.

  In the above embodiment, the area of the receiving net is divided into four areas, ie, a front area, a middle area, a rear area, and a termination area. Any number of stages may be set as long as it is changed in the transport direction of the bag. For example, you may comprise by two area | regions, a front area | region and a center area | region.

  The shape of the leakage hole is a regular square or a regular hexagon. However, the shape is not limited to this as long as it is a polygonal shape having corners. It is good also as a square shape. Furthermore, you may combine these some polygonal shape.

  Furthermore, the leakage hole is formed by punching out an iron plate. However, the blades are not provided at the corners, and burrs formed when punching are not removed. Or may be configured.

  In addition to the polygonal shape described above, the shape of the leakage hole in the embodiment includes a long hole shape and a rectangular shape, but these shapes may be combined in any way, or in a single shape. All the leakage holes may be formed. For example, if the shape of the leakage holes of the receiving net is all the same as that of the terminal leakage holes, it is possible to reduce the grain conveyance resistance and improve the adaptability to the wetting material.

  Furthermore, it is preferable to form the diagonal line of the polygonal leakage hole longer than the entire length of the grain, and when the lengths of a plurality of diagonal lines are different, the longest diagonal line is the rotation direction D of the barrel 16. It is more preferable to form so as to substantially match.

5 Thresher 11 Handling Chamber 16 Handling Cylinder 16a Front Handling Cylinder 16b Rear Handling Cylinder 26 Opening 30, 70, 80 Receiving Net 50, 71, 81 Front Leakage Hole 51, 72, 82 Middle Leakage Hole 52, 73 , 83 Rear leakage holes 53, 75, 84 Terminal leakage holes l Diagonal line of leakage holes D Direction of rotation of the cylinder

Claims (3)

A handling cylinder for threshing the grain from the cereal basket, a handling chamber for rotatably supporting the handling cylinder, and a receiving net disposed along the handling cylinder and having a number of leakage holes, A handling cylinder is formed by dividing it into the front and rear in the middle part of the cereal conveyance direction, and of these two handling cylinders, a front part disposed on the inlet side of the handling chamber, which is upstream of the cereal conveyance direction. In the threshing machine in which the rotational speed of the barrel is slower than the rotational speed of the rear barrel disposed on the outlet side of the handling chamber, which is the downstream side of the grain conveying direction,
A leakage hole formed in an opening area of the leakage hole at a position corresponding to a boundary portion between the front handling cylinder and the rear handling cylinder from the entrance side of the handling chamber to the middle part of the front handling cylinder. Larger than the opening area of
Threshing machine characterized by that. At least a part of the leakage hole of the receiving net has a quadrangular shape or a hexagonal shape, and the direction of the diagonal line is substantially coincident with the rotation direction of the handling cylinder.
The threshing machine according to claim 1. A processing chamber that is arranged in parallel with the chamber and connected to the chamber through an opening provided on the outlet side of the chamber;
A treatment cylinder rotatably supported in the treatment chamber,
The leakage hole of the receiving net at a position corresponding to the opening is a long hole extending obliquely with respect to the rotation direction of the handling cylinder,
The threshing machine according to claim 1 or 2.

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