Threshing device

Abstract

To provide a threshing device that prevents a motor from stopping due to overheating with a simple configuration by devising the arrangement constitution of the motor that rotationally drives a fan in order to solve such a problem that the operation of a fan is stopped due to overheating of a fan motor in a threshing device that has a sorting chamber for sorting threshed kernels on the lower side of a threshing chamber, and a fan motor that rotationally drives a fan which blows sorting wind to the sorting chamber.SOLUTION: In a threshing device which includes an oscillating sorting device and a wind sorting device 30 that blows sorting wind on the lower side of a threshing chamber provided with a threshing cylinder, a sorting motor 37 which operates the wind sorting device 30 is placed in the vicinity of an air inlet 30a of the wind sorting device 30, only a motor drive shaft 37a of the sorting motor 37 is arranged in the air inlet 30a, another part is arranged outside a machine body with respect to the air inlet 30a or a part on the air inlet 30a side of the sorting motor 37 and the motor drive shaft 37a are arranged inside the air inlet 30a.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a threshing device equipped on a combine, a threshing machine, or the like.

Background Art

[0002] As a threshing device of a combine, it is provided with a handling chamber for threshing cereal straws at the upper part, and a sorting chamber for sorting the threshed grains at the lower side of the handling chamber. And a winnowing fan motor that rotationally drives a winnowing fan for blowing sorting air into the sorting chamber is provided outside the machine body near the air intake of the winnowing fan (see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the winnowing fan motor must be arranged considering positions where falling straw debris and the like are less likely to hit, and even if it is arranged near the air intake, it cannot be sufficiently cooled, and the operation of the winnowing fan stops due to overheating, resulting in a problem of reduced work efficiency.

[0005] An object of the present invention is to provide a threshing device that devises the arrangement configuration of a motor that rotationally drives a winnowing fan as a wind power sorting device and prevents operation stop due to overheating of the motor with a simple configuration.

Means for Solving the Problems

[0006] The first aspect of the present invention is In a threshing device provided with a swing sorting device (20) and a pneumatic sorting device (30) for blowing sorting air below a handling chamber (10) provided with a handling cylinder (12), a sorting motor (37) for operating the pneumatic sorting device (30) is provided near an air inlet (30a) of the pneumatic sorting device (30), only a motor drive shaft (37a) of the sorting motor (37) is disposed in the air inlet (30a), and other portions are disposed outside the machine body than the air inlet (30a), or a part of the sorting motor (37) on the air inlet (30a) side and the motor drive shaft (37a) are disposed in the air inlet (30a). , a wind tunnel (38) is provided to surround the outer periphery of the sorting motor (37) around the axial direction of the motor drive shaft (37a) A threshing device characterized by the above. A second aspect of the present invention is Wind tunnel A threshing device according to the first aspect of the present invention, characterized in that (38) surrounds from the pneumatic sorting device (30) side to a part of the sorting motor (37) or to an outer end portion of the sorting motor (37) outside the machine body. A third aspect of the present invention is In a threshing device provided with a swing sorting device (20) and a pneumatic sorting device (30) for blowing sorting air below a handling chamber (10) provided with a handling cylinder (12), a sorting motor (37) for operating the pneumatic sorting device (30) is provided near the air inlet (30a) of the pneumatic sorting device (30), only the motor drive shaft (37a) of the sorting motor (37) is arranged in the air inlet (30a), and other parts are arranged outside the machine body than the air inlet (30a), or a part of the sorting motor (37) on the air inlet (30a) side and the motor drive shaft (37a) are arranged in the air inlet (30a), A wind tunnel (38) surrounding the outer periphery of the sorting motor (37) is provided, Wind characterized in that the wind tunnel (38) is disposed at a predetermined distance from the air inlet (30a), and a gap (39) is provided between the wind tunnel (38) and the air inlet (30a). Of threshing A threshing device. A fourth aspect of the present invention is A threshing device according to the second or third aspect of the present invention, characterized in that a plurality of ventilation holes (38a) are formed in the wind tunnel (38), or ventilation holes (38b) on the side far from the air inlet (30a) of the pneumatic sorting device (30) are made smaller than ventilation holes (38a) on the near side. A fifth aspect of the present invention is A control device for controlling the rotational speed of the sorting motor (37) is provided to make the rotational speed of the pneumatic sorting device (30) variable. When the pneumatic sorting device (30) starts rotating, the control device Step by step controls the rotational speed of the pneumatic sorting device (30) to increase the speed, and when the pneumatic sorting device (30) stops rotating, the control device Step by step decelerates and stops the rotational speed of the pneumatic sorting device (30). A threshing device according to any one of the first to third aspects of the present invention, characterized by the above. The first invention related to the present inventionIn a threshing device provided with a swing sorting device 20 and a pneumatic sorting device 30 for blowing sorting air below a handling chamber 10 provided with a handling cylinder 12, a sorting motor 37 for operating the pneumatic sorting device 30 is provided near an air inlet 30a of the pneumatic sorting device 30, only a motor drive shaft 37a of the sorting motor 37 is disposed in the air inlet 30a, and other portions are disposed outside the machine body from the air inlet 30a, or a part of the sorting motor 37 on the air inlet 30a side and the motor drive shaft 37a are disposed in the air inlet 30a.

[0007] The first invention related to the present invention According to this, by operating the pneumatic sorting device 30 with the sorting motor 37, the rotational speed of the sorting motor 37 can be adjusted according to the variety of the harvested product, the conditions of the work place, and the amount of grain and leaf debris, and the wind force and the air volume of the pneumatic sorting device 30 can be changed. Therefore, grains and impurities can be efficiently separated.

[0008] Further, since the sorting motor 37 is provided near the air inlet 30a of the pneumatic sorting device 30 and most of the sorting motor 37 is disposed outside the machine body from the air inlet 30a, the sorting motor 37 can be cooled by the outside air taken in from the air inlet 30a. Therefore, a cooling fan for the sorting motor 37 becomes unnecessary, the number of parts can be reduced, and a low-cost and simple configuration can be achieved.

[0009] The second invention related to the present invention A wind tunnel 38 surrounding the outer periphery of the sorting motor 37 is provided, and the wind tunnel 38 surrounds from the pneumatic sorting device 30 side to a part of the sorting motor 37 or to the outer end portion of the sorting motor 37 outside the machine body. The first invention related to the present invention This is the threshing device.

[0010] The second invention related to the present invention According to this, since the wind tunnel 38 surrounds from the pneumatic sorting device 30 side to a part of the sorting motor 37 or to the outer end portion of the sorting motor 37 outside the machine body, the air around the sorting motor 37 is sucked, the cooling effect of the sorting motor 37 is improved, and the stop of the sorting motor 37 due to overheating can be appropriately prevented.

[0011] The third invention related to the present inventionA wind tunnel 38 surrounding the outer periphery of the sorting motor 37 is provided, the wind tunnel 38 is arranged at a predetermined distance from the air inlet 30a, and a gap 39 is provided between the wind tunnel 38 and the air inlet 30a. The first invention related to the present invention It is a threshing device.

[0012] The third invention related to the present invention According to this, since the wind tunnel 38 surrounding the outer periphery of the sorting motor 37 is arranged at a predetermined distance from the air inlet 30a and a gap 39 is provided between the wind tunnel 38 and the air inlet 30a, outside air enters the main body of the sorting motor 37 through the wind tunnel 38, and outside air enters the motor drive shaft 37a through the gap 39. Therefore, overheating of the entire sorting motor 37 is prevented.

[0013] The fourth invention related to the present invention It is a threshing device that forms a plurality of ventilation holes 38a in the wind tunnel 38, or makes the ventilation holes 38b on the side far from the air inlet 30a of the air sorting device 30 smaller than the ventilation holes 38a on the near side. The second or third invention related to the present invention It is a threshing device.

[0014] The fourth invention related to the present invention According to this, by providing a plurality of ventilation holes 38a in the wind tunnel 38, it becomes easier to take in outside air around the sorting motor 37, so the cooling effect of the sorting motor 37 is improved.

[0015] Also, by making the ventilation holes 38b on the side far from the air inlet 30a of the air sorting device 30 smaller than the ventilation holes 38a on the near side, outside air is more easily taken in due to the air pressure difference, and the cooling effect of the sorting motor 37 is improved.

[0016] The fifth invention related to the present invention It is a threshing device that provides a control device for controlling the rotation speed of the sorting motor 37 to make the rotation speed of the air sorting device 30 variable. When the air sorting device 30 starts rotating, the control device gradually increases the rotation speed of the air sorting device 30, and when the air sorting device 30 stops rotating, the control device gradually decelerates and stops the rotation speed of the air sorting device 30. Any one of the first to third inventions related to the present invention It is a threshing device.

[0017] The fifth invention related to the present inventionAccording to the present invention, a control device for controlling the rotational speed of the sorting motor 37 is provided to make the rotational speed of the air separation device 30 variable. When the air separation device 30 starts rotating, the control device gradually increases the rotational speed of the air separation device 30. When the air separation device 30 stops rotating, the control device gradually decelerates and stops the rotational speed of the air separation device 30. Therefore, it is possible to prevent a large load caused by sudden high-speed rotation or sudden stop at the start or stop of the sorting motor 37 from being applied to the sorting motor 37 or the air separation device 30, thereby preventing malfunctions and damages.

Brief Description of the Drawings

[0018]

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Figure 16

Embodiments for Carrying Out the Invention

[0019] Hereinafter, a threshing device equipped in a combine which is an embodiment of the present invention will be described with reference to the accompanying drawings. For the sake of easy understanding, for the convenience of explanation, the front side is referred to as the front side, the rear side as the rear side, the right hand side as the right side, and the left hand side as the left side when viewed from the operator, but the configuration is not limited by these.

[0020] As shown in FIGS. 1 to 3, the combine is provided with a traveling device 2 composed of a pair of left and right crawlers that travel on the soil surface on the lower side of the machine body frame 1, a cutting device 3 for cutting the cereal straws in the field is provided on the front side of the machine body frame 1, and a threshing device 4 for threshing and sorting the cut cereal straws is provided on the left rear side of the cutting device 3, and an operator's cab 5 where the operator boards is provided on the right rear side of the cutting device 3.

[0021] An engine room 6 for mounting the engine E is provided on the lower side of the operator's cab 5, a grain tank 7 for storing the threshed and sorted grains is provided on the rear side of the operator's cab 5, and a discharge auger 8 composed of a vertical lift part 8a for discharging the grains to the outside and a horizontal discharge part 8b extending in the front-rear direction is provided on the rear side of the grain tank 7.

[0022] As shown in FIGS. 4 and 5, in the handling chamber 10 at the upper part of the threshing device 4, a handling cylinder 12 for threshing the cereal straws conveyed by the feed chain 11 is provided. A receiving net 13 is provided on the lower side of the handling cylinder 12, and the upper part of the handling cylinder 12 is covered with a handling cylinder cover 14.

[0023] On the upper part of the sorting chamber 15 at the lower part of the threshing device 4, a swinging sorting device 20 for sorting the grains threshed by the handling cylinder 12 is provided.

[0024] The shaking sorting device 20 is formed, in order from the front side, by a transfer shelf 21 formed of a plate-like body, a fixed sieve 22 formed of a plurality of plate-like bodies provided with a rearward upward inclination at a predetermined interval in the front-rear direction, a variable sieve 23 formed of a plurality of plate-like bodies provided with a variable rearward upward inclination angle at a predetermined interval in the front-rear direction, and a stro-rack 24 formed of a plurality of plate-like bodies provided at a predetermined interval in the left-right direction.

[0025] The inclination angle of the fixed sieve 22 can be changed by driving a sieve motor 27 provided on the right wall of the threshing device 4 via an angle changing means 26. The angle changing means 26 is swingably provided on the right surface of the left wall of the frame body 25 of the shaking sorting device 20. Further, the output shaft of the sieve motor 27 and the base portion of the angle changing means 26 are connected via a rod 29 extending in the left-right direction.

[0026] Below the shaking sorting device 20, in order from the front side, there are provided a rice winnowing basket 30 as a wind power sorting device that blows sorting air toward the fixed sieve 22 and the variable sieve 23, a first screw 31 that conveys the grains leaking from the fixed sieve 22 and the variable sieve 23 to the grain tank 7, and a second screw 32 that conveys the second-grade materials with branches and the like adhering thereto leaking from the stro-rack 24 to the second processing chamber 16 provided on the right side of the handling chamber 10. Further, above the stro-rack 24, there is provided a dust exhaust fan 35 that discharges dust such as branches and the like to the outside.

[0027] Note that the grains are conveyed from the first screw 31 to the grain tank 7 by the first elevating cylinder 40', and the second-grade materials are conveyed from the second screw 32 to the second processing chamber 16 by the second elevating cylinder 41.

[0028] As shown in FIGS. 6 and 7, the rice winnowing basket 30 is driven to rotate by a rice winnowing basket motor 37 as a sorting motor constituted by an electric motor provided on the right wall of the threshing device 4.

[0029] The driving rotation speed of the rice winnowing basket motor 37 is controlled by a control device to adjust the rotation speed of the rice winnowing basket 30.

[0030] That is, the control device controls the rotational speed of the winnowing motor 37 in accordance with the operation of the wind force setting unit provided in the operation unit 5.

[0031] Furthermore, at the start of the rotation of the winnowing fan 30, the control device controls the rotational speed of the winnowing fan 30 to gradually increase. For example, it is controlled to reach 20% of the target rotational speed 1 second after the start of rotation (when the winnowing motor 37 is turned on), 60% of the target rotational speed 2 seconds after the start, and 100% of the target rotational speed 3 seconds after the start.

[0032] Also, at the stop of the rotation of the winnowing fan 30, the control device controls the rotational speed of the winnowing fan 30 to gradually decrease and stop. For example, it is controlled to reach 60% of the original rotational speed 1 second after the stop of rotation (when the winnowing motor 37 is turned off), 20% of the original rotational speed 2 seconds after the stop, and stop 3 seconds after the stop.

[0033] Therefore, if the winnowing motor 37 suddenly rotates at high speed or suddenly stops at the start or stop of rotation, there is a risk of overloading the winnowing motor 37 and the winnowing fan 30 and causing malfunctions. However, by controlling as described above, overloading can be suppressed and malfunctions and damage can be prevented.

[0034] Here, the arrangement configuration of the winnowing motor 37 will be described in detail.

[0035] The winnowing motor 37 is assembled to the right wall of the threshing device 4, is arranged outside the machine body side of the intake port 30a near the intake port 30a of the winnowing fan 30, and only the motor drive shaft 37a of the winnowing motor 37 is arranged inside the intake port 30a.

[0036] And the motor drive shaft 37a of the winnowing motor 37 is arranged on the same axis as the rotation shaft 30b of the winnowing fan 30, and the tip of the motor drive shaft 37a and the right end of the rotation shaft 30a are connected.

[0037] Therefore, the rotation shaft 30b of the winnowing fan 30 is driven to rotate by the rotation of the motor drive shaft 37a of the winnowing motor 37, and the winnowing fan 30 is rotationally driven by the winnowing motor 37.

[0038] Therefore, by operating the winnowing fan 30 with the winnowing fan motor 37, the wind force and the air volume of the winnowing fan 30 can be changed at the wind force setting unit according to the variety of the harvested product, the conditions of the working place, and the amounts of grains and leaf debris. Thus, the grains and the impurities can be efficiently separated.

[0039] Further, the winnowing fan motor 37 is provided near the air inlet 30a of the winnowing fan 30, and most of the winnowing fan motor 37 is arranged outside the machine body rather than the air inlet 30a. Thus, the winnowing fan motor 37 can be cooled by the outside air taken in from the air inlet 30a, so that the cooling fan of the winnowing fan motor 37 becomes unnecessary, and the number of parts can be reduced to achieve an inexpensive and simple configuration.

[0040] Also, a cylindrical air duct 38 extending from the outer peripheral portion of the air inlet 30a toward the winnowing fan motor 37 is provided, and the air duct 38 surrounds the side portion of the air inlet 30a side of the winnowing fan motor 37 (the air duct 38 covers a part of the winnowing fan motor 37 in the direction of the motor drive shaft 37a).

[0041] Therefore, since the cylindrical air duct 38 extending from the outer peripheral portion of the air inlet 30a toward the winnowing fan motor 37 is provided, the air around the winnowing fan motor 37 is sucked, the cooling effect of the winnowing fan motor 37 is improved, and the stop of the winnowing fan motor 37 due to overheating can be appropriately prevented.

[0042] Note that the air duct 38 may surround not only the side portion of the air inlet 30a side of the winnowing fan motor 37 but also the entire winnowing fan motor 37.

[0043] Also, as shown in FIG. 8, a plurality of ventilation holes 38a may be provided in the air duct 38.

[0044] By providing the ventilation holes 38a in the air duct 38, it becomes easier to take in the outside air around the winnowing fan motor 37, so that the cooling effect of the winnowing fan motor 37 is improved.

[0045] Also, as shown in FIG. 9, when providing a plurality of ventilation holes 38a and 38b in the air duct 38, the ventilation holes 38b on the side farther from the air inlet 30a of the winnowing fan 30 may be made smaller than the ventilation holes 38a on the nearer side.

[0046] By making the vent hole 38b on the side far from the intake port 30a smaller, outside air is more likely to be taken in due to the pressure difference, and the cooling effect of the winnowing motor 37 is improved.

[0047] FIG. 10 shows an example in which the arrangement of the wind tunnel 38 is changed.

[0048] That is, the wind tunnel 38 surrounds the periphery of the main body of the winnowing motor 37 and is arranged at a predetermined distance from the intake port 30a, and a gap 39 is provided between the wind tunnel 38 and the intake port 30a.

[0049] Therefore, outside air enters the main body of the winnowing motor 37 through the wind tunnel 38, and outside air enters the motor drive shaft 37a through the gap 39, so overheating of the entire winnowing motor 37 is prevented.

[0050] FIG. 11 shows an example in which the arrangement of the winnowing motor 37 is changed.

[0051] That is, a part of the winnowing motor 37 on the intake port 30a side and the motor drive shaft 37a are arranged inside the intake port 30a.

[0052] And the wind tunnel 38 extends from the outer peripheral portion of the intake port 30a toward the winnowing motor 37 and surrounds the entire winnowing motor 37.

[0053] Note that, as described above, the wind tunnel 38 may be configured to surround a part of the winnowing motor 37 in the direction of the motor drive shaft 37a.

[0054] Also, as described above, the wind tunnel 38 may surround the periphery of the main body of the winnowing motor 37 and be arranged at a predetermined distance from the intake port 30a, and a gap 39 may be provided between the wind tunnel 38 and the intake port 30a.

[0055] Also, as described above, a plurality of vent holes 38a may be provided in the wind tunnel 38. And the vent hole 38b on the side far from the intake port 30a of the winnowing 30 may be made smaller than the vent hole 38a on the near side.

[0056] Therefore, since a part on the intake port 30a side of the winnowing motor 37 and the motor drive shaft 37a are arranged inside the intake port 30a, the cooling effect of the winnowing motor 37 is improved.

[0057] FIG. 12 shows an example in which a cooling fan 40 is arranged outside the machine body of the winnowing motor 37.

[0058] That is, a cooling fan 40 driven by the winnowing motor 37 is provided on the right outer side of the machine body on the side far from the winnowing 30 (intake port 30a) of the winnowing motor 37, and the cooling fan 40 sends air toward the winnowing 30 (intake port 30a).

[0059] Note that the outer diameter of the cooling fan 40 is larger than the outer circumference of the winnowing motor 37.

[0060] Therefore, by providing a cooling fan 40 driven by the winnowing motor 37 on the right outer side of the machine body on the side far from the winnowing 30 (intake port 30a) of the winnowing motor 37 and sending air toward the winnowing 30 (intake port 30a), the winnowing motor 37 can be cooled, the intake of the winnowing 30 can be assisted, and the air separation can be performed more efficiently.

[0061] Note that, as shown in FIG. 13, a cooling fan 40 driven by the winnowing motor 37 is provided on the side close to the winnowing 30 (intake port 30a) of the winnowing motor 37, and the cooling fan 40 sucks the air around the winnowing motor 37 and sends air toward the winnowing 30 (intake port 30a). In this way, the winnowing motor 37 can be cooled, the intake of the winnowing 30 can be assisted, and the air separation can be performed more efficiently.

[0062] FIG. 14 shows the configuration of an air guide body 50 that guides the air blown by the winnowing 30 to the lower side of the swing sorting device 20.

[0063] That is, the air guide body 50 is composed of a lower air guide body 50a, a middle air guide body 50b, and an upper air guide body 50c arranged at the air outlet of the winnowing 30, and the air outlet side of the winnowing 30 is configured to be position-adjustable and fixable by rotation shafts 51a, 51b, and 51c, respectively.

[0064] Therefore, the positions of the air outlet sides of the winnowing bodies 30 of the lower-air guide body 50a, the middle-air guide body 50b, and the upper-air guide body 50c can be adjusted, and the intervals between the air outlet sides of the winnowing bodies 30 of the lower-air guide body 50a, the middle-air guide body 50b, and the upper-air guide body 50c can be adjusted.

[0065] Therefore, when the intervals between the air outlet sides of the winnowing bodies 30 of the lower-air guide body 50a, the middle-air guide body 50b, and the upper-air guide body 50c are adjusted to be larger, the intervals between the air guide ports of the lower-air guide body 50a, the middle-air guide body 50b, and the upper-air guide body 50c become larger than the air guide outlet, so the air velocity of the air flow becomes faster.

[0066] Therefore, in addition to changing the rotation speed of the winnowing body 30, the air velocity can be adjusted by adjusting the intervals between the air outlet sides of the winnowing bodies 30 of the lower-air guide body 50a, the middle-air guide body 50b, and the upper-air guide body 50c. As a result, the adjustment range of the air velocity becomes wider, and the applicable range of the working conditions becomes broader, enabling appropriate threshing operations.

[0067] FIG. 15 shows the arrangement configuration of the fuel suction pipe 60 of the fuel tank of the engine E.

[0068] That is, the fuel suction pipe 60 is provided so as to pass between the grain tank 7 and the elevating part 8a extending in the vertical direction for discharging the grains of the grain tank 7 to the outside, and is directed toward the rear of the machine body.

[0069] And the fuel suction pipe 60 extends rearward at an angle of 15 degrees with respect to the vertical rear surface of the grain tank 7.

[0070] As shown in FIG. 16, the fuel suction pipe 60 is made of resin and is provided by insert molding a fitting for the fuel suction port with a fuel suction cap that can be freely opened and closed attached to the fuel suction port 60a.

[0071] Note that the fitting for the fuel suction port is provided with an anti-rotation projection by insert molding so as not to rotate when the fuel suction cap is opened and closed, and a locking groove 61 for locking the fuel suction cap is provided.

[0072] Also, the fuel suction cap has a key.

[0073] Therefore, in the case of a conventional iron oil suction pipe with nickel plating, there were many welded parts, the cost was high, and there was also precipitation of zinc or the like, so there were many problems. However, since the oil suction pipe 60 is made of resin, it can be configured at low cost and precipitation of zinc or the like can be eliminated. Furthermore, by making the oil suction pipe 60 of resin, weight reduction can also be achieved.

[0074] Also, it may be made entirely of resin with a locking groove 61 formed when locking the oil suction cap without insert molding an oil suction fitting into the oil suction pipe 60.

Explanation of reference numerals

[0075] 10 Handling chamber 12 Handling cylinder 20 Oscillating sorting device 30 Wind power sorting device 30a Intake port 37 Sorting motor 37a Motor drive shaft 38 Wind tunnel 38a Vent hole 38b Vent hole 39 Gap

Claims

1. In a threshing device provided with a swinging sorting device (20) and a pneumatic sorting device (30) for blowing sorting air below a handling chamber (10) provided with a handling cylinder (12), a sorting motor (37) for operating the pneumatic sorting device (30) is provided near an air inlet (30a) of the pneumatic sorting device (30), only a motor drive shaft (37a) of the sorting motor (37) is disposed within the air inlet (30a), and other parts are disposed outside the machine body than the air inlet (30a), or a part of the sorting motor (37) on the air inlet (30a) side and the motor drive shaft (37a) are disposed within the air inlet (30a), and a wind tunnel (38) surrounding the outer periphery of the sorting motor (37) in the axial direction around the motor drive shaft (37a) is provided. The threshing device is characterized by this.

2. The threshing device according to claim 1, characterized in that the wind tunnel (38) surrounds from the pneumatic sorting device (30) side to a part of the sorting motor (37) or to the outer end of the sorting motor (37) outside the machine body.

3. In a threshing device provided with a swinging sorting device (20) and a pneumatic sorting device (30) for blowing sorting air below a handling chamber (10) provided with a handling cylinder (12), a sorting motor (37) for operating the pneumatic sorting device (30) is provided near an air inlet (30a) of the pneumatic sorting device (30), only a motor drive shaft (37a) of the sorting motor (37) is disposed within the air inlet (30a), and other parts are disposed outside the machine body than the air inlet (30a), or a part of the sorting motor (37) on the air inlet (30a) side and the motor drive shaft (37a) are disposed within the air inlet (30a), a wind tunnel (38) surrounding the outer periphery of the sorting motor (37) is provided, the wind tunnel (38) is disposed at a predetermined distance away from the air inlet (30a), and a gap (39) is provided between the wind tunnel (38) and the air inlet (30a). The threshing device is characterized by this.

4. The threshing device according to claim 2 or claim 3, characterized in that a plurality of ventilation holes (38a) are formed in the wind tunnel (38), or ventilation holes (38b) on the side farther from the air inlet (30a) of the pneumatic sorting device (30) are made smaller than ventilation holes (38a) on the nearer side.

5. A control device for controlling the rotational speed of the sorting motor (37) is provided to make the rotational speed of the air separation device (30) variable. When the air separation device (30) starts rotating, the control device controls the rotational speed of the air separation device (30) to increase step by step. When the air separation device (30) stops rotating, the control device decelerates the rotational speed of the air separation device (30) step by step and then stops. The threshing device according to any one of claims 1 to 3, characterized in that.

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