Threshing device

Abstract

To provide a threshing device improved in threshing performance in which the threshing remain with grain remaining in cobs is hard to occur, even as for the crops such as the corn.SOLUTION: Corn is hooked to a first threshing unit 321, and is rotated with a threshing cylinder 30 while being pressed on a receiving net 50, and thereby a lot of grain is threshed from cobs. The corn with a lot of grain being threshed is conveyed from the first threshing unit 321 to a second threshing unit 322, and is moved with the rotation of the threshing cylinder 30 while being sandwiched to the second threshing unit 322 and the receiving net 50. A length in an anti-rotating direction of the second threshing unit 322 is longer than a gap (S3) between a tip 90a of a helix blade 90 in the radial direction of the threshing cylinder 30 and the receiving net 50. Also, a gap (S2) between the second threshing unit 322 and the receiving net 50 is set in the substantially same degree as the diameter of the cob or in the slightly narrow degree. Accordingly, the corn is moved in a state of being pressed on the receiving net 50 by the second threshing unit 322, and the grain is threshed even from the cob with the threshing remain.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a threshing device mounted on a general-purpose combine or the like, which threshes crops while conveying them between a receiving net by the rotation of a handling cylinder.

Background Art

[0002] Generally, a general-purpose combine includes a threshing device that threshes crops cut by a cutting unit. Conventionally, a threshing device has been proposed in which a spiral blade is provided on the outer peripheral surface of a rotating cylindrical handling cylinder (also called a rotor), and a latching member is provided between adjacent blades (Patent Document 1). Generally, when a crop such as corn is conveyed in a horizontal posture orthogonal to the rotation direction of the handling cylinder, it is caught by handling teeth or the like provided on the handling cylinder and is carried around by the handling cylinder while being pressed against the receiving net, and is likely to receive a threshing action. On the other hand, when corn is conveyed in a vertical posture parallel to the rotation direction of the handling cylinder, the corn is likely to enter between the blades and be discharged outside the machine without receiving a threshing action. Therefore, in the threshing device described in Patent Document 1, the crop is guided to the receiving net side by the latching member so that a crop such as corn is not discharged outside the machine without being threshed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] As described above, in the device described in Patent Document 1, by guiding corn to the receiving net side by the latching member, it is possible to prevent the crop from being discharged outside the machine without being threshed. However, conventionally, the threshing action has not been sufficient, and there has been a case where "leftover handling" occurs in the crop discharged outside the machine body.

[0005] Therefore, the present invention aims to provide a threshing device with improved threshing performance that makes it less likely for unthreshed grain to occur, even with crops such as corn. [Means for solving the problem]

[0006] A threshing apparatus (3) according to one embodiment of the present invention is A threshing device comprising a cylindrical threshing drum (30) and receiving nets (50) arranged at intervals along the outer surface of the threshing drum, which threshes crops while conveying them in accordance with the rotation of the threshing drum, The aforementioned hilt is, The spiral blade (90) formed on the outer peripheral surface, The device comprises a threshing member (32) disposed between adjacent blades in the rotational axis direction of the threshing drum, The aforementioned raking member is The first threshing section (321) is formed to extend in a counter-rotational direction opposite to the rotational direction of the threshing drum as it moves away from the outer surface of the threshing drum, and presses the crop against the receiving net as the threshing drum rotates to thresh it. The threshing drum has a second threshing section (322) which is continuous with the first threshing section on the upstream side in the rotational direction and is formed to protrude toward the receiving net side beyond the tip (90a) of the blade in the radial direction of the threshing drum, and which threshes the crops conveyed from the first threshing section between itself and the receiving net as the threshing drum rotates. It is characterized by the following:

[0007] The length of the second threshing section (322) in the counter-rotation direction is longer than the gap between the tip of the blade and the receiving net in the radial direction.

[0008] The second threshing section (322) has a top surface (327) that extends linearly along the counter-rotation direction, and a protruding portion (330) that extends beyond the top surface toward the receiving net so as to press the crops against the receiving net.

[0009] The threshing member (32) is fixed to the outer circumferential surface of the threshing drum between adjacent blades in the direction of the rotation axis.

[0010] The threshing drum (30) has reinforcing members (35) that are provided between adjacent blades in the direction of the rotation axis, projecting radially from the outer circumferential surface of the threshing drum, and connecting and reinforcing adjacent blades. The threshing member (32) has a notch (325) that can engage with the reinforcing member, and is fixed to the blade in a state where it is engaged with the reinforcing member via the notch.

[0011] The symbols in parentheses above are for reference only and do not affect the description of the claims. [Effects of the Invention]

[0012] According to the present invention as of claim 1, in the threshing member disposed between the blades, the crops conveyed from the first threshing unit, which rotates the crops together with the threshing drum while they are hanging on a receiving net, are threshed by the second threshing unit while being sandwiched between the receiving net and the threshing member. Therefore, it is possible to provide a threshing device with improved threshing performance that is less likely to leave any crops unthreshed, even if they are crops such as corn. In other words, the corn before threshing is reliably guided to the threshing member by the blades, and is conveyed while being pressed against the receiving net by the threshing member, thereby promoting the threshing of the corn and improving the threshing performance of the threshing device.

[0013] According to the present invention as of claim 2, the second threshing section is formed such that its length in the counter-rotation direction is longer than the gap between the tip of the blade and the receiving screen in the radial direction of the threshing drum, thereby promoting the threshing process and enabling the threshing of grains even from crops that were not completely threshed in the first threshing section.

[0014] According to the present invention according to claim 3, the protruding portion narrows the gap with the receiving net in the second threshing portion, and the corn can be conveyed while being reliably pressed against the receiving net. As a result, even when the crop is corn smaller than the standard, the corn is strongly sandwiched and conveyed between the second threshing portion and the receiving net, so that threshing can be performed with less handling residue.

[0015] According to the present invention according to claim 4, since the handling member is fixed to the outer peripheral surface of the handling cylinder between adjacent blades in the direction of the rotation axis, the handling member can be easily attached to the handling cylinder.

[0016] According to the present invention according to claim 5, since the handling member is engaged with the reinforcing rib and attached to the blade, it is difficult to bend and deform due to the load applied when threshing the crop. Also, positioning when attaching the handling member becomes easy.

Brief Description of the Drawings

[0017] [Figure 1] A side view showing a suitable general-purpose combine using the threshing device according to the present embodiment. [Figure 2] A side cross-sectional view showing the threshing device. [Figure 3] A side view showing the handling cylinder. [Figure 4] A front cross-sectional view showing the handling cylinder and the receiving net. [Figure 5] A perspective view showing a part of the receiving net. [Figure 6] A diagram for explaining the reinforcing plate and the detachable vertical bar. [Figure 7] (a) Side view and (b) perspective view showing the handling member of the first embodiment. [Figure 8]It is a diagram showing the handling member of the second embodiment, (a) a side view showing the case where a round bar member is provided in a direction intersecting the rotation direction of the handling cylinder in the second threshing section, (b) a perspective view showing the case where a round bar member is provided in a direction intersecting the rotation direction of the handling cylinder in the second threshing section, (c) a top view showing the case where the round bar member is obliquely extended as viewed from above in the second threshing section, (d) a side view showing the case where the round bar member is obliquely extended as viewed from above in the second threshing section, (e) a side view showing the case where three round bar members are extended in a direction intersecting the rotation direction of the handling cylinder in the second threshing section, (f) a perspective view showing the case where three round bar members are extended in the rotation direction of the handling cylinder in the second threshing section. [Figure 9] It is a diagram showing another embodiment of the handling member, (a) a side view showing the case where the second threshing section is a curved surface, (b) a side view showing the case where a protruding member is provided at the downstream end side of the second threshing section, (c) a side view showing the case where a protruding member is provided at the upstream end of the second threshing section, (d) a side view showing the case where a protruding member is provided at approximately the center of the second threshing section.

Embodiments for Carrying out the Invention

[0018] Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, a suitable general-purpose combine using the threshing device of the present embodiment will be described with reference to FIGS. 1 and 2. In FIGS. 1 and 2, for the sake of easy understanding of the description, the illustration of the receiving net described later is omitted.

[0019] As shown in FIG. 1, the general-purpose combine 1 includes a traveling body 1A, a cutting unit 2 for cutting crops (grain straws), a threshing device 3 for threshing and sorting grain from the crops that are fully straw-fed, a grain tank 4 for storing the sorted grain, a discharge auger 5 for discharging the grain in the grain tank 4 to the outside of the machine, a post-treatment unit 6 for post-treating the threshed straw, a driving operation unit 7 for the driver to ride on, and a crawler-type traveling unit 8.

[0020] The harvesting unit 2 is comprised of a header 9 connected to the front end of the traveling machine body 1A so as to be movable up and down, a divider 10 (grass divider) at the front end of the header 9 for separating unharvested grain stalks, a cutting blade 11 for cutting the unharvested grain stalks, a reel 12 for scooping up the unharvested grain stalks and harvested grain stalks, an auger 13 for gathering the scooped-up grain stalks at predetermined locations in the width direction, and a conveying feeder 14 for transporting the grain stalks gathered by the auger 13 toward the threshing device 3 and feeding all the stalks into the threshing device 3.

[0021] As shown in Figure 2, the threshing device 3 has a threshing section 20 and a sorting section 60 located below the threshing section 20. The threshing section 20 separates the grain from the crop, and the sorting section 60 sorts the mixture of grain and husks that falls from the threshing section 20 through the receiving net 50 (see Figure 4, described later). The threshing device 3 of this embodiment is suitable for threshing crops with hard and thick cobs, such as corn (for example, dent corn).

[0022] The threshing unit 20 includes a threshing chamber 21 into which corn conveyed from the conveying feeder 14 is fed, a cylindrical threshing drum 30 that is rotatably supported inside the threshing chamber 21 and extends in the front-rear direction, and an arc-shaped receiving screen 50 (see Figure 4) that is removablely positioned below the threshing drum 30. In this embodiment, as will be described in detail later, the threshing drum 30 is equipped with a plurality of threshing teeth 31 and threshing members 32 in the direction of the rotation axis, and the corn is threshed mainly by the threshing members 32 and the receiving screen 50 as the threshing drum 30 rotates. The threshed grains (corn kernels) and the threshed cob are conveyed by the threshing drum 30 in a mixed state and are roughly sorted by being sieved by the receiving screen 50.

[0023] The sorting unit 60 includes an oscillating sorting body 61 located below the receiving screen 50, and a winnowing fan 62 located below the front of the oscillating sorting body 61. The oscillating sorting body 61 is composed of an oscillating transfer plate 63, a chaff sieve 64, a rack 65, and a straw rack 66, and is configured to screen the mixture falling from the receiving screen 50. The winnowing fan 62 generates airflow from below the front of the oscillating sorting body 61 towards the upper rear, and is configured to blow away husks and other debris from the mixture moving on the oscillating sorting body 61 to the outside of the machine through the discharge port 69 for sorting. The threshed ears are also discharged to the outside of the machine through the discharge port 69.

[0024] Behind the winnowing fan 62, there is a first spiral 67 that collects the sorted grains into the grain tank 4 (see Figure 1), and behind the first spiral 67, there is a second spiral 68 with a blower fan 24 in between. In this second spiral 68, insufficiently sorted grains are collected and returned to the oscillating transfer plate 63 or into the handling chamber 21.

[0025] Next, the threshing drum 30 and the receiving net 50 will be described using Figures 3 to 6 with reference to Figure 2. As shown in Figure 3, the threshing drum 30 has a cylindrical threshing drum body 33, a side plate 34 integrally formed with the threshing drum body 33, and a rotating shaft 40. The rotating shaft 40 is inserted through the threshing drum body 33 and is rotatably supported on the front and rear side walls of the threshing device 3, which are arranged opposite the threshing drum body 33 at a predetermined distance in the direction of the rotation axis. As the rotating shaft 40 rotates, the threshing drum body 33 and the side plate 34 rotate together.

[0026] As shown in Figures 3 and 4, spiral blades 90 are formed on the outer circumferential surface of the threshing drum body 33 to scoop and transport the crops transported from the conveying feeder 14 to the back of the threshing chamber 21. Reinforcing ribs 35 are provided between adjacent spiral blades 90 (between the spiral blades) as reinforcing members. Multiple reinforcing ribs 35 are arranged at intervals in the rotational direction (circumferential direction) of the threshing drum 30, extending along the rotational axis direction between adjacent spiral blades 90. The reinforcing ribs 35 reinforce the spiral blades 90 by connecting adjacent spiral blades 90 so that they do not bend easily when transporting corn (including when transporting the ears of corn after threshing). The reinforcing ribs 35 are provided parallel to the rotational axis of the threshing drum 30 (more specifically, the rotational axis 40).

[0027] The spiral blades 90 are equipped with multiple threshing teeth 31 that protrude toward the receiving screen 50 (receiving screen side) and are detachably attached by screws 300, primarily for threshing rice and wheat. The rice and wheat raked into the threshing chamber 21 are conveyed along the threshing drum body 33 in the direction of the rotation axis by the spiral blades 90, and are threshed by being squeezed between the threshing teeth 31 and the receiving screen 50.

[0028] Between adjacent spiral blades 90, a threshing member 32 is detachably provided on the outer surface of the threshing drum 30. In this embodiment, the corn raked into the threshing chamber 21 is threshed by being pressed against the receiving net 50 by the threshing member 32 and transported, and also threshed by being sandwiched between the threshing member 32 and the receiving net 50 to reduce unthreshed grain. In this embodiment, when threshing corn, the threshing teeth 31 are removed and the threshing member 32 is attached, and when threshing rice, wheat, etc., the threshing member 32 is removed and the threshing teeth 31 is attached.

[0029] Specifically, the threshing member 32 is fixed as a fixing member to the mounting holes of the threshing teeth 31 by common screws 300, so that it can be replaced with the threshing teeth 31 described above. Figure 4 shows an example where two threshing teeth 31 are replaced with threshing members 32. The threshing member 32 is then attached to the spiral blades 90 by engaging with the reinforcing ribs 35 and disposed on the outer circumferential surface of the threshing drum 30. Of course, this is not the only way in which the threshing member 32 can be fixed to the outer circumferential surface of the threshing drum 30 by screws or the like. However, it is preferable that the threshing member 32 is attached to the spiral blades 90 by engaging with the reinforcing ribs 35 because it becomes less likely to bend and deform under the load when threshing corn. It also makes it easier to position the threshing member 32 when installing it. Furthermore, by installing the threshing member 32 in place of the threshing teeth 31, it becomes easier to evenly distribute the threshing members 32 in the threshing drum 30 without causing weight unevenness. The detailed configuration of the threshing member 32 will be described later (see Figures 7(a) and 7(b)).

[0030] In this embodiment, the threshing member 32 is attached to the spiral blade 90 near the reinforcing rib 35 where it engages with the reinforcing rib 35. However, the embodiment is not limited to this, and it may be attached at a location other than near the reinforcing rib 35 without engaging with the reinforcing rib 35.

[0031] Next, the receiving net 50 will be explained using Figures 4 to 6 with reference to Figure 2. As shown in Figure 4, the receiving net 50 is formed in an arc shape along the outer circumferential surface of the lower part of the threshing drum 30 when viewed from the front (in the direction of the rotation axis of the threshing drum 30).

[0032] As shown in Figure 5, the receiving net 50 is a grid net formed in a grid shape by a plurality of vertical bars 51, 52, a plurality of horizontal bars 53, and a frame 54. The horizontal bars 53 are made of round bar members that extend along the rotation axis direction of the threshing drum 30, and a plurality of horizontal bars 53 are arranged side by side in the circumferential direction of the threshing drum 30. The vertical bars 51, 52 are made of arc-shaped plate members that are along the rotation direction (circumferential direction) of the threshing drum 30, and a plurality of vertical bars 51, 52 are arranged side by side in the rotation axis direction of the threshing drum 30.

[0033] The multiple vertical bars 51 and 52 include multiple welded vertical bars 51, which are arranged at predetermined intervals in the direction of the rotation axis and have both ends welded to the frame 54, and multiple detachable vertical bars 52, which are arranged between adjacent welded vertical bars 51 and have both ends detachably attached to the frame 54. That is, as shown in Figure 5, the receiving net 50 is constructed by welding the frame 54, the multiple welded vertical bars 51 and the multiple horizontal bars 53, and the detachable vertical bars 52 are detachably attached between adjacent welded vertical bars 51 in this receiving net 50. The detachable vertical bars 52 are attached to the frame 54 at both the upper and lower ends by screws 56 on the back side of the receiving net 50, that is, the side opposite to the side facing the hoisting drum 30.

[0034] Although not explained here, the multiple horizontal bars 53 may also include multiple welded horizontal bars, each with both ends in the direction of the rotation axis welded to the frame 54, and multiple detachable horizontal bars, which are positioned between adjacent welded horizontal bars and whose ends are detachably attached to the frame 54. This is preferable because it allows the mesh size to be changed, and the receiving net 50 can be used for threshing crops other than corn (for example, rice, wheat, soybeans, buckwheat, etc.) based on the selective attachment and detachment (or repositioning) of the detachable vertical bars 52 (or detachable horizontal bars).

[0035] As shown in Figure 6, the detachable vertical bar 52 has a notch 521 to avoid interference with the multiple horizontal bars 53, and the detachable vertical bar 52 is attached to the frame 54 with the multiple horizontal bars 53 fitted into the notch 521. In this embodiment, a reinforcing plate 55 is detachably attached to the detachable vertical bar 52 by screws 56. The reinforcing plate 55 has a groove 55a for sandwiching the horizontal bars 53 between itself and the detachable vertical bar 52. That is, by attaching the reinforcing plate 55, the detachable vertical bar 52 is locked in place by the horizontal bars 53 fitted into the notch 521. Therefore, the detachable vertical bar 52 cannot be removed from the frame 54 unless both the screws 56 and the reinforcing plate 55 are removed.

[0036] As described above, the rigidity of the detachable vertical bar 52 can be improved by attaching the reinforcing plate 55 to the detachable vertical bar 52. In other words, if the reinforcing plate 55 is not attached to the detachable vertical bar 52, there is a risk that the detachable vertical bar 52 will deform due to the load from the accumulated grains if grains accumulate between the threshing drum 30 and the receiving net 50. Therefore, as in this embodiment, when the reinforcing plate 55 is attached to the detachable vertical bar 52, the rigidity of the detachable vertical bar 52 can be improved, so even if grains or ears of grain accumulate and a load is placed on the receiving net 50, the detachable vertical bar 52 is less likely to deform. In addition, the reinforcing plate 55 prevents the detachable horizontal bar fitted into the notch 521 of the detachable vertical bar 52 from coming out of the notch 521 due to external force.

[0037] As shown in Figure 6, it is preferable that the reinforcing plate 55 is formed to protrude toward the threshing drum 30 beyond the curve Y that passes through the inner circumference of the detachable vertical bar 52 when viewed from the direction of the rotation axis of the threshing drum 30. This is advantageous because it suppresses the transport of corn in the direction of the rotation axis and promotes threshing of corn by the threshing drum 30 and the receiving net 50. However, it is desirable that the reinforcing plate 55 is formed so that the tip edge portion 550 on the upstream side in the direction of rotation (arrow X direction) does not protrude toward the threshing drum 30 beyond the curve Y. This is because if the tip edge portion 550 protrudes toward the threshing drum 30 beyond the curve Y, there is a risk that the threshed grains being transported in the rotation direction may hit the tip edge portion 550, causing the grains to chip or break. In contrast, in this embodiment, since the tip edge portion 550 does not protrude toward the threshing drum 30 beyond the curve Y, chipping or breaking is less likely to occur even if the grains hit the tip edge portion 550.

[0038] <First Embodiment> Next, the threshing members 32 will be described using Figures 7(a) and 7(b) with reference to Figures 3 and 4. In this embodiment, as described above, in order to mainly thresh corn, a plurality of threshing members 32 are detachably arranged between adjacent spiral blades 90 in the threshing drum 30. It is preferable that the threshing members 32 be arranged at predetermined phase angles (for example, every 45°) with respect to the rotation center of the rotation axis 40 of the threshing drum 30.

[0039] The threshing member 32 has a first threshing section 321, a second threshing section 322, and side wall sections 323 and 324. The first threshing section 321 and the second threshing section 322 are formed by bending a plate material, and the plate material is held at both ends in the direction of the rotation axis by the side wall sections 323 and 324, thereby integrally forming the threshing member 32. The side wall sections 323 and 324 have mounting holes 326 for attaching the threshing member 32 to the spiral blades 90 by screws 300, and notches 325 that can engage with the reinforcing ribs 35 described above.

[0040] As shown in Figure 7(a), the first threshing section 321 is formed to be inclined in the opposite direction of rotation to the direction of rotation of the threshing drum 30 as it moves away from the outer surface of the threshing drum 30 on the downstream side in the direction of rotation (arrow X direction). In the first threshing section 321, the corn is threshed by rotating it together with the threshing drum 30 while it is caught on the receiving net 50. That is, in the first threshing section 321, the corn is conveyed from the threshing drum 30 side to the receiving net 50, and the corn is threshed by rotating together with the threshing drum 30 while being pressed against the receiving net 50.

[0041] On the other hand, the second threshing section 322 is continuous with the first threshing section 321 on the upstream side in the direction of rotation, and is formed to protrude towards the receiving net 50 side beyond the tip 90a of the spiral blades 90 in the radial direction of the threshing drum 30. In the second threshing section 322, the corn conveyed from the first threshing section 321 is held between the receiving net 50 and moved while rotating in the opposite direction to the rotation of the threshing drum 30, thereby enabling the threshing of any remaining grains on the stalk that could not be threshed by the first threshing section 321.

[0042] The length of the second threshing part 322 in the reverse rotation direction is longer than the thickness of the plate material forming the first threshing part 321 and the second threshing part 322, and is also longer than the diameter of the cob of the corn to be threshed. In the present embodiment, the length of the second threshing part 322 in the reverse rotation direction is formed longer than the gap (S3, see FIG. 4) between the tip 90a of the spiral blade 90 and the receiving net 50 in the radial direction of the handling cylinder 30. Thereby, the time during which the corn is conveyed while being sandwiched between the second threshing part 322 and the receiving net 50 is ensured. The length of the second threshing part 322 is set to, for example, "50 mm".

[0043] As shown in FIG. 4, the gap (S3) between the tip 90a of the spiral blade 90 and the receiving net 50 is longer than the gap (S1, for example, 6 mm) between the tip 31a of the handling tooth 31 and the receiving net 50, and is also longer than the gap (S2, for example, 22 mm) between the second threshing part 322 and the receiving net 50 (S1 < S2 < S3), and is set to, for example, "28 mm". On the other hand, the gap (S2) between the second threshing part 322 and the receiving net 50 is set to be approximately the same as the diameter of the cob of the corn to be threshed or slightly narrower (for example, about 1 to 3 mm narrower).

[0044] As described above, in this embodiment, the threshing member 32 is positioned between adjacent spiral blades 90, the corn is caught on the first threshing section 321 of the threshing member 32, and the corn is pressed against the receiving net 50 as it moves in accordance with the rotation of the threshing drum 30. This ensures that the corn before threshing is reliably guided to the threshing member 32 by the spiral blades 90, and the threshing member 32 presses the corn against the receiving net 50, resulting in good threshing performance. Therefore, a large amount of grain is threshed from the cob. The corn, from which a large amount of grain has been threshed in the first threshing section 321, is then transported from the first threshing section 321 to the second threshing section 322, and is moved in accordance with the rotation of the threshing drum 30 while sandwiched between the second threshing section 322 and the receiving net 50. The length of the second threshing unit 322 in the counter-rotation direction is longer than the thickness of the plate material forming the first threshing unit 321 and the second threshing unit 322, and also longer than the diameter of the corn cob to be threshed. Furthermore, the gap (S2) between the second threshing unit 322 and the receiving screen 50 is set to be approximately the same as or slightly narrower than the diameter of the corn cob. Therefore, when the corn is moved while sandwiched between the second threshing unit 322 and the receiving screen 50, it can be reliably pressed against the receiving screen 50, thereby enabling the threshing of grains from cobs that have been left unthreshed. In this way, even with crops like corn, which have hard and thick cobs, the amount of unthreshed grain can be reduced.

[0045] <Second Embodiment> In the embodiment described above, the corn is transported while being held between the second threshing unit 322 and the receiving net 50. However, if the corn is smaller than standard due to variations in growth, it will be transported while only weakly held between the second threshing unit 322 and the receiving net 50. Therefore, it may be discharged with a larger amount of unthreshed corn compared to standard corn. Thus, it is desirable to be able to thresh even smaller corn with as little unthreshed corn as possible. Below, the threshing members 32A to 32H of the second embodiment, which aim to achieve this, will be described with reference to Figures 3 and 4, and with reference to Figures 8(a) to 9(d).

[0046] In the case of the threshing member 32A shown in Figures 8(a) and 8(b), the second threshing section 322 has a top surface 327 that extends linearly along the counter-rotation direction and a round bar member 330 that protrudes from the top surface 327 toward the receiving net 50 to narrow the gap between the top surface 327 and the receiving net 50 (S2, see Figure 4), and has a round bar member 330 as a protruding part that presses the corn against the receiving net 50. The threshing member 32A is formed by welding a single round bar member 330 integrally to the upper surface of the second threshing section 322 of the threshing member 32 of the first embodiment described above. The round bar member 330 is located approximately in the center of the rotation direction (arrow X direction) of the threshing drum 30 in the second threshing section 322, and extends in a direction intersecting the rotation direction of the threshing drum 30. By welding the round bar member 330 to the upper surface of the second threshing section 322, the gap (S2, see Figure 4) between the second threshing section 322 and the threshing member 32 can be narrowed by the diameter of the round bar member 330 (for example, 1 to 3 mm) compared to the case of the threshing member 32 described above where the round bar member 330 is not welded.

[0047] In this threshing member 32A, the notches 325 formed in the side wall portions 323 and 324 are formed so that, when viewed from the side, at least a portion of them does not overlap. Therefore, the threshing member 32A is mounted between adjacent spiral blades 90 at a predetermined angle with respect to the rotation axis of the threshing drum 30. As a result, the round bar member 330 is also at a predetermined angle with respect to the rotation axis of the threshing drum 30. Note that, as shown in Figure 8(e) for the threshing member 32C, multiple round bar members 330 may be welded in parallel.

[0048] As shown in Figures 8(c) and 8(d), the threshing member 32B is formed by welding a single round bar member 330 integrally to the upper surface of the second threshing section 322, similar to the threshing member 32A described above, but differs in that the round bar member 330 extends diagonally in the second threshing section 322 when viewed from above. In this threshing member 32B as well, the notches 325 formed in the side wall portions 323 and 324 are formed so that at least a portion of them do not overlap when viewed from the side, so that they can be attached between the spiral blades 90 at a predetermined angle with respect to the rotation axis of the threshing drum 30. In this case, the round bar member 330 is formed diagonally in the second threshing section 322 so that it is parallel to the rotation axis of the threshing drum 30.

[0049] Furthermore, as shown in Figure 8(e) with respect to the threshing member 32C, multiple (in this case, three) of the above-described round bar members 330 may be integrally formed by welding on the upper surface of the second threshing section 322. Also, as shown in Figure 8(f) with respect to the threshing member 32D, multiple (in this case, three) of the round bar members 330 may extend in the rotational direction of the threshing drum 30 in the second threshing section 322.

[0050] In the threshing members 32A to 32D described above, the gap (S2, see Figure 4) between the receiving net 50 and the second threshing section 322 is narrowed by the round bar member 330. As a result, even if the corn is smaller than standard due to variations in growth, for example, it is pressed against the receiving net 50 by the round bar member 330 and transported in a tightly gripped state. This allows for threshing with less unthreshed corn, even if it is smaller than standard. Furthermore, the threshing member 32A is preferable because it can be formed as a replaceable threshing member capable of creating an optimal gap (S2) according to the type of corn, simply by welding the round bar member 330 to the threshing member 32 shown in Figure 7(b).

[0051] By the way, narrowing the gap (S2, see Figure 4) between the second threshing section 322 and the receiving net 50 is not limited to welding the round bar member 330 to the second threshing section 322 as described above. If the gap (S2, see Figure 4) between the receiving net 50 and the second threshing section can be narrowed and the corn can be guided to press against the receiving net 50, the round bar member 330 described above does not need to be used. An embodiment of such a case is shown in Figures 9(a) to 9(d).

[0052] The threshing member 32E shown in Figure 9(a) is formed in a curved shape such that the second threshing section 322 protrudes towards the receiving net 50 side at approximately the center in the rotational direction of the threshing drum 30 (arrow X direction) compared to the upstream or downstream side (that is, so that the gap with the receiving net 50 becomes narrower).

[0053] The threshing member 32F shown in Figure 9(b) is provided with a protruding member 360 such that the downstream side of the second threshing section 322 protrudes further toward the receiving net 50 than the top surface 327 in the rotational direction of the threshing drum 30 (arrow X direction).

[0054] The threshing member 32G shown in Figure 9(c) is provided with a protruding member 370 such that the upstream side of the second threshing section 322 protrudes towards the receiving net 50 beyond the top surface 327 in the rotational direction of the threshing drum 30 (arrow X direction). In this case, for example, one plate-shaped member can be bent so that the upstream side of the second threshing section 322 protrudes towards the receiving net 50 beyond the top surface 327, and the protruding member 370 does not need to be welded or otherwise attached, making it easier to form compared to other methods.

[0055] The threshing member 32H shown in Figure 9(d) has a protruding member 380 with a triangular cross-section located approximately in the center of the second threshing section 322 in the rotational direction of the threshing drum 30 (arrow X direction). In this case, for example, a single plate-shaped member may be bent so that the center of the second threshing section 322 protrudes from the top surface 327 towards the receiving net 50.

[0056] As described above, by narrowing the gap between the receiving net 50 and the second threshing section 322, even corn smaller than standard size can be threshed with less unthreshed grain. [Explanation of Symbols]

[0057] 3… Threshing device 30... Handling body 32... Throwing member 35…Reinforcement rib (reinforcement member) 50...Reception net 90... Spiral feather (blade) 90a...Blade tip 300... Screw (fixing component) 321...First Threshing Section 322... Second Threshing Section 325... Notch 327... Top surface 330... Round bar member (protruding part) 360, 370, 380... protruding members (projections)

Claims

1. A threshing device having a cylindrical threshing drum and receiving nets arranged at intervals along the outer peripheral surface of the threshing drum, which threshes crops while transporting them according to the rotation of the threshing drum, The handling drum is a spiral blade formed on the outer circumferential surface; a threshing member disposed between the blades adjacent to each other in the rotation axis direction of the threshing drum, The sieving member is A first threshing unit is formed to extend in a counter-rotational direction opposite to the rotational direction of the threshing drum as it moves away from the outer peripheral surface of the threshing drum, and threshes the crop by pressing it against the receiving net as the threshing drum rotates. A second threshing unit is connected to the first threshing unit upstream in the direction of rotation, and is formed to protrude further toward the receiving net than the tip of the blade in the radial direction of the threshing drum, and threshes the crops transported from the first threshing unit by sandwiching them between the threshing drum and the receiving net as the threshing drum rotates. A threshing device characterized by:

2. The second threshing unit has a length in the counter-rotation direction that is longer than the gap between the tip of the blade and the receiving net in the radial direction; 2. A threshing device according to claim 1.

3. The second threshing unit has a top surface extending linearly along the counter-rotation direction and a protruding portion protruding toward the receiving net from the top surface so as to press the crop against the receiving net.

3. A threshing device according to claim 1 or 2.

4. The threshing member is fixed to the outer peripheral surface of the threshing drum between the blades adjacent to each other in the rotation axis direction. A threshing device according to any one of claims 1 to 3.

5. The threshing drum has a reinforcing member that protrudes in the radial direction from the outer peripheral surface of the threshing drum between the blades that are adjacent to each other in the rotation axis direction, and connects and reinforces the adjacent blades, The trimming member has a notch portion that can be engaged with the reinforcing member, and is fixed to the blade in a state where it is engaged with the reinforcing member via the notch portion. A threshing device according to any one of claims 1 to 3.

Images