JPH0568428A - Grain discharging device of combine harvester - Google Patents

Abstract

PURPOSE:To obtain the subject device smoothly transmitting rotation between spiral wings, having a discharging and lifting cylinder and a grain tank held by a shaft of the cylinder, arranging engaging protrusions at the tip of a revolving shaft of a discharging spiral wing for traverse transportation of grain and gearing the engaging protrusions with a revolving shaft of a middle screw wing. CONSTITUTION:A grain discharging device of combine harvester is equipped with a discharging and lifting cylinder 13 at a stationary position and a grain tank 6 for reserving grain, held horizontally rotatably by a shaft of the cylinder. A discharging screw wing 7 to transport grain to the discharging and lifting cylinder 13 is set at the side of a grain tank 6, a middle screw wing 15 to be engaged and disengaged with the discharging screw wing 7 is laid at the side of the discharging and lifting cylinder 13, engaging protrusions 48 in a state of passing the side of a revolving shaft 46 and projecting from both sides of the revolving shaft are set at the tip of the revolving shaft 46 of the discharging screw wing 7. An insertion hole part 50 into which the tip of the revolving shaft 46 is inserted and which is geared with the revolving shaft is fixed at the center of a revolving shaft 49 of the middle screw wing 15, plural engaging collar parts 51 to be detachably geared with. the engaging protrusions 48 are projected in the parallel direction with the center of the shaft at the half part of the edge of the revolving shaft 49, an engaging groove 52 is set between engaging collar parts 51 and a gearing dented part 53 is laid at the half side of the rest.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combine grain discharging apparatus.

[0002]

2. Description of the Related Art In the publicly known Japanese Utility Model Publication No. 2-128443, a discharge fried cylinder having a fixed position, and a grain storing a grain rotatably pivoted horizontally with respect to the discharged fried cylinder are disclosed. A tank, a discharge spiral blade for laterally feeding grains to the discharge frying cylinder is provided on the Glen tank side, and an intermediate spiral blade that engages and disengages with the discharge spiral blade is provided on the discharge frying cylinder side. It is described about the thing. In the specification and the drawings of Japanese Patent Application No. 3-12912, which is a prior application to the present application, a position-fixed discharge fried cylinder and a grain rotatably axially fixed to the discharge fried cylinder are disclosed. And a discharge tank on the side of the discharge tank, the discharge spiral blade for laterally transporting grains is provided on the side of the discharge tank, and the discharge lift blade is disposed on the discharge tank side. In the case where the spiral blade is provided, an engaging projection is provided at the tip of the rotary shaft of the discharge spiral blade so as to project laterally through the rotary shaft, and at the center of the rotary shaft of the intermediate spiral blade. An insertion hole for inserting and engaging the tip of the rotating shaft is provided, and an engaging collar portion for detachably engaging the engaging protrusion is projected on one side of the end face of the rotating shaft in a direction parallel to the axis. Proposals have been made for a combine harvester that has been formed.

[0003]

The discharge spiral blade and the intermediate spiral blade of the above-mentioned known example are simply detachable, and no detailed structure has been devised. In the invention of the above-mentioned prior application, the details of the structure for attaching and detaching the discharge spiral blade and the intermediate spiral blade are devised. However, in the case of the prior application, the rotation axis of the discharge spiral blade is laterally attached to the tip of the rotation axis. An engaging projection protruding to both sides through is provided, an insertion hole into which the tip of the rotary shaft is inserted and engaged is provided at the center of the rotary shaft of the intermediate spiral blade, and the one end of the rotary shaft is provided with the above-mentioned Since the engaging projection is formed so as to project in the direction parallel to the axial center of the engaging collar portion that is detachably engaged, the area of the portion where the engaging collar portion does not exist is large,
When the engagement protrusion engages there, a large amount of play is generated, and therefore, there is a problem in that the rotation is impacted and transmitted to the rotary shaft on the side of the intermediate spiral blade.

[0004]

It is an object of the present invention to prevent impact transmission between the engaging projection and the rotary shaft on the side of the intermediate spiral blade.

[0005]

Therefore, according to the present invention, a fixed position discharge fried cylinder 13 and a grain tank for storing a grain which is axially rotatably fixed to the discharge fried cylinder 13 are stored. 6
And the discharged fried cylinder 1 on the side of the Glen tank 6
3, a discharge spiral blade 7 for laterally feeding grains is provided, and an intermediate spiral blade 15 that engages and disengages with the discharge spiral blade 7 is provided on the discharge lifting cylinder 13 side. The tip end of the shaft 46 is provided with engaging protrusions 48, 48 that pass through the rotary shaft 46 laterally and project to both sides.
5 is provided with an insertion hole 50 into which the tip of the rotary shaft 46 is inserted and engaged, and the engaging projection 48 is detachably engaged with one half of the end face of the rotary shaft 49. A plurality of engaging brim portions 51 that are formed to project in a direction parallel to the axis,
An engaging groove 52 is provided between the engaging flanges 51, and an engaging recess 53 is formed in one half of the remaining part where the engaging flange 51 is not provided.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Explaining the embodiments of the present invention, 1 is a machine frame, 2 is a traveling device provided below the machine frame 1, 3 is a driver's seat, 4 is a thresher, and 5 is an ejector. An straw treatment device having a cutter for cutting straw, 6 is a grain tank for storing grains threshed by the threshing device 4 provided on the side of the threshing device 4, and the gren tank 6 has a storage position and maintenance. It is provided so as to be horizontally rotatable with respect to the outer open position for the like. Although illustration is omitted, a mowing unit is provided on the front side of the traveling device 2, and a conveying unit for supplying grain culms to the threshing device 4 is provided on a side portion of the driver's seat 3. Inside the grain tank 6, a front-rear discharge spiral blade 7 for discharging the grain in the tank 6 to the outside of the machine is provided, and the rear end of the discharge spiral blade 7 is projected outside the rear wall 8 of the grain tank 6. .. The rear end of the discharge spiral blade 7 is surrounded by a discharge pipe 9 fixed to the rear wall 8. The discharge tube 9 is detachably attached to an auger metal 11 fixed to the machine body frame 1 via a stay 10. On top of the auger metal 11 is a grain lifting device 12
The lower part of the discharged fried food cylinder 13 is rotatably attached. A base of a discharge auger 14 for discharging grains to a tank of a truck is rotatably attached to an upper portion of the discharge fried cylinder 13.

The tip of the discharge spiral wing 7 is provided with the discharge cylinder 9
And is detachably connected to the tip of the intermediate spiral blade 15 provided in the auger metal 11 as will be described later. The base of the intermediate spiral blade 15 is mounted on a bearing 16 provided in the auger metal 11. To do. Further, a vertical spiral blade is provided in the discharged fried grain cylinder 13, and a lower portion of the vertical spiral blade is attached to the bearing 16 of the auger metal 11. The lower portion of the grain tank 6 is configured to rotate about a lower shaft 17 provided at a joint portion between the discharge cylinder 9 and the auger metal 11. On the end face of the joint portion of the auger metal 11, the discharge tube 9
A brim portion 19 is formed to which the tip portion 18 formed at the outer end portion of is fitted. A notch 20 is formed in the lower part of the collar 19, and the grain of the collar 19 is dropped from the notch 20. That is, when the Glen tank 6 is once opened and rotated, the grains in the auger metal 11 spill into the collar portion 19,
If the Glen tank 6 is returned to its original position in this state,
The spilled grain is sandwiched between the tip portion 18 and the collar portion 19, the discharge cylinder 9 and the auger metal 11 are not completely tightened, and this causes grain leakage. It is dropped so that the tip portion 18 of the discharge tube 9 is completely fitted in the collar portion 19 of the auger metal 11.

An annular abutting surface 21 is formed on the inner peripheral surface on the back side of the collar portion 19 and is substantially vertical with which the tip portion 18 abuts, except for the portion of the notch portion 20. 21 for the time being
An inclined inner peripheral surface 22 having a larger diameter toward the Glen tank 6 side is formed on the peripheral edge of the, and a horizontal inner peripheral surface 23 having the same inner diameter from beginning to end is formed on the peripheral edge of the inclined inner peripheral surface 22 on the Glen tank 6 side. Form. The inclined inner peripheral surface 22 and the horizontal inner peripheral surface 23 are also formed in an annular shape except for the cutout portion 20. The tip 1
8 has a substantially vertical abutment surface 24 that abuts against the abutment surface 21, and an inclined outer peripheral surface 25 that has a larger diameter toward the Glen tank 6 side at the periphery of the abutment surface 24. ,
A horizontal outer peripheral surface 26 having the same outer diameter is formed at the peripheral edge of the inclined outer peripheral surface 25, and an annular annular flange portion 45 is formed on the horizontal outer peripheral surface 26 on the side of the gren tank 6, and the horizontal outer peripheral surface 26 contacts the flange portion 19. Configure to touch. That is, when the tip portion 18 is inserted into the collar portion 19, the contact surface 24 comes into close contact with the abutting surface 21, and there is a gap between the inclined inner peripheral surface 22 and the inclined outer peripheral surface 25.
The horizontal outer peripheral surface 26 is closely fitted to the horizontal inner peripheral surface 23, and the collar portion 1
The annular flange portion 45 comes into contact with the end surface of 9 and is sealed at three points. Further, since the discharge spiral blade 7 shifts and conveys the grain to either the rotation ascending side or the rotation descending side with respect to the center depending on its shape, the lower shaft 17 is arranged in the rotation direction of the discharge spiral blade 7. It is provided on the side closer to the grain in the relative relationship of 1. and the grain is arranged so as to be located on the side on which the degree of opening is small when the discharge cylinder 9 is opened and rotated outward to reduce the leakage of the grain.

Therefore, the rotary shaft 46 of the discharge spiral blade 7 is
Is formed on a tip projection 47 formed in a conical shape having a smaller diameter toward the tip, and the base of the tip projection 47 is formed so as to project in a direction orthogonal to the axial direction of the rotary shaft 46. Engagement protrusions 48 are formed so as to extend laterally through the rotary shaft 46 and project to both sides. A pair of engagement protrusions 48 are formed,
It is formed in a uniaxial shape. The rotary shaft 49 of the intermediate spiral blade 15 has an insertion hole 50 into which the tip projection 47 is inserted. A plurality of engaging flanges 51 to which the engaging protrusions 48 are detachably engaged are formed on one half of the end surface of the rotating shaft 49 in a direction parallel to the axis. The engaging flange portion 51 is formed by dividing the end surface of the rotary shaft 49 into four and adjoining two on one side half, and an engaging groove 52 is formed between the engaging flange portions 51. The engaging flange portion 51 is formed so that the width becomes smaller toward the tip. Further, four engaging recesses 53 with which the engaging protrusions 48 engage are formed at the end edge of the rotating shaft 49, and one of the engaging recesses 53 is formed at the groove bottom of the engaging groove 52. It

Therefore, the rotating shaft 46 of the discharge spiral blade 7 is
When the Glen tank 6 is once opened and pivoted outward, the tip projection 47 of the is detached from the insertion hole 50 of the intermediate spiral blade 15,
When the Glen tank 6 is returned to its original position, the tip projection 47 is inserted into the insertion hole 50, and the engagement projection 4 of the tip projection 47 is inserted.
8, one engages with an engagement groove 52 between the engagement flange 51 and the engagement flange 51, and the other engages with an engagement recess 53 corresponding to the engagement groove 52. The engaging projection 48 is formed so as to project outward so that it does not come into contact with the inner surface of the engaging collar portion 51 and lock when rotated about the lower shaft 17, and the tip of the engaging projection 48 is formed. The engaging groove 52 is configured to be engaged with the side surface of the engaging flange portion 51 while engaging with the engaging groove 52.
Further, the inner surface of the insertion hole portion 50 on the end edge side is formed as a tapered surface 54 so that the diameter becomes smaller toward the inner side in the axial direction, and the tip of the tip projection portion 47 contacts the inner surface of the insertion hole portion 50. It is configured to prevent the lock.

Reference numeral 27 denotes a rear supporting frame fixed to the rear end of the machine frame 1 and having a U-shape in a side view. A rotary supporting member 29 is attached to an upper frame 28 of the rear supporting frame 27, and the rotary supporting member 29 is rotated. The outer periphery of the upper portion of the discharged fried cylinder 13 is rotatably attached to the support member 29. Bent portion 30 of the upper frame 28
The stay 31 is fixed to the stay 31, the angle-shaped support member 32 is fixed to the stay 31, and the upper shaft 3 is fixed to the support member 32.
3 is attached, and the upper rotating portion 34 provided on the upper portion of the Glen tank 6 is axially attached to the upper shaft 33. The upper shaft 33 serves as a rotary core on the upper portion of the Glen tank 6. Reference numeral 35 denotes a tank rotation supporting frame, which is formed in an inverted L-shape by a left-right rear frame 36 and a front-rear horizontal frame 37, and the front end of the rear frame 36 is fixed to the stay 31. The rear frame 36
The connecting portion between the horizontal frame 37 and the horizontal frame 37 is fixed to the side wall 38 side of the threshing device 4 by a supporting member 39, and the intermediate portion of the horizontal frame 37 is mounted on the grain tank 6 from the threshing device 4 to the grain tank 6 by mounting metal fittings 40, 40. It is fixed to the supply fried cylinder 41 for supplying. The front end of the horizontal frame 37 is configured to extend forward of the feeding and lifting cylinder 41, and is fixed to the front inside portion of the threshing device 4. The lower part of the feeding fried cylinder 41 is fixed to the frame of the threshing device 4 so as to be connected to the end of the first conveyor provided in the threshing device 4, and the casing 43 above the feeding fried cylinder 41 is the grain tank. 6 is detachably attached to the insertion opening formed in the inner side wall 44 of 6. The straw processing device 5 is rotatably attached to the rear support frame 27. Although not shown, the Glen tank 6 is provided with a lock device provided at a desired position so that the thresher 4
Fixed to the side. In the figure, although not shown, 55 is a second product returning device for returning the second product taken out from the second conveyor of the threshing device to the sorting device. A cleaning port 58 is opened in the member 56, and a lid member 59 is detachably attached to the cleaning port 58. Reference numeral 60 is an opening / closing lever.

[0012]

[Operation] Next, the operation will be described. When the machine is moved forward, the mowing section cuts the grain culms in the field, supplies the mowed grain culms to the threshing device, and threshes, and the first thing is taken out by the first conveyor and is supplied to the end of the first conveyor. Since the lower part of the fried food cylinder 41 is connected, the grain extracted by the first conveyor is fried by the supply fried food cylinder 41 and stored in the grain tank 6. When a certain amount of grain is stored in the grain tank 6, when the aircraft is moved to a light truck waiting near the field and the grain lifting device 12 and the discharge spiral blade 7 are operated, the grain in the grain tank 6 is reduced. Is flown into the auger metal 11 through the discharge cylinder 9 by the discharge spiral blade 7, the inflowing grain is conveyed to the lower part of the discharge fried cylinder 13 by the intermediate spiral blade 15, and is discharged and discharged by the discharge fried cylinder 13 Entering the auger 14, the grain is discharged into the tank of the light truck by the discharge auger 14, and the grain discharging operation from the grain tank 6 is performed.

However, when the mowing threshing work and the discharging work are completed, or when the transmission device on the back side of the Glen tank 6 is defective during the discharging work,
The auger metal 11 of the grain fried food discharging device 12 and the casing 43 of the supply fried cylinder 41 are left on the machine side, and the upper portion of the Glen tank 6 is centered on the upper shaft 33, and the lower portion of the Glen tank 6 is centered on the lower shaft 17. Open outward and rotate horizontally, and a wide space is formed around the side wall 38 of the threshing device 4, which allows inspection of the transmission device and the like.
When maintenance such as cleaning is performed and the work such as inspection is completed, the Glen tank 6 is returned to the storage position centered on the upper shaft 33 and the lower shaft 17.

Although not shown, the power from the engine is transmitted to one end of the rotary shaft 46 of the discharge spiral blade 7 in the Glen tank 6 to rotate the discharge spiral blade 7, and the rotation of the discharge spiral blade 7. Is transmitted to the intermediate spiral blade 15 by the engagement between the engagement protrusion 48 on the tip side of the discharge spiral blade 7 and the engagement flange portion 51 of the intermediate spiral blade 15, and the rotation of the intermediate spiral blade 15 is discharged.
It is transmitted to the spiral blade (not shown) in the unit 3. In this case, since the intermediate spiral blade 15 and the discharge spiral blade 7 are located inside the auger metal 11, the discharge spiral blade 7 rotates outward with the Glen tank 6, and therefore the discharge spiral blade The engagement between the engagement protrusion 48 of the blade 7 and the engagement flange 51 is
It is detachable, and two engaging flanges 51 are formed on the end surface of the rotary shaft 49 of the intermediate spiral blade 15 adjacent to each other at four divided positions with an engaging groove 52 therebetween. Since four engaging recesses 53 are formed on the end face, and one of the engaging recesses 53 is formed at the groove bottom of the engaging groove 52, when the Glen tank 6 is returned to the original position, the discharge spiral is formed. The tip projection 47 of the rotary shaft 46 of the blade 7 is inserted into the insertion hole 50, and one of the engagement projections 48 at the base of the tip projection 47 has one of the engagement grooves 52.
And the other engages with the engagement recess 53. Therefore, when the rotating shaft 46 of the discharge spiral blade 7 is rotated, the engagement projection 48 does not rattle due to play, and the intermediate spiral blade 1
The rotary shaft 49 of 5 is rotated. That is, the engaging collar portion 51
When only one is provided, the engaging protrusion 48 has the engaging flange portion 51.
Since there is a large amount of play until it comes into contact with the engaging spiral blade 7, the rotating force of the discharge spiral blade 7 becomes large, and the bevel gear in the auger metal 11 may be damaged due to the impact of the engaging protrusion 48 colliding with the engaging flange portion 51. However, the present invention prevents this.

Further, if four engaging flanges 51 are provided,
Although the engaging projections 48 engage with the engaging grooves 52 on both sides of the individual engaging flanges 51 to lock them, and the Glen tank 6 cannot be rotated. Since the brim portion 51 is adjacent to the engaging groove 52 with the engaging groove 52 interposed therebetween, the flange portion 51 is reliably engaged. In this case, since the two engaging protrusions 48 are linearly arranged, both of them may not engage with the engaging groove 52 (usually, one of the engaging protrusions 48 does not engage with the engaging groove 52). The engaging projections 48 are engaged with the engaging recesses 53 of the intermediate spiral blades 15 when the Glen tank 6 is returned to its original position. However, since one of them is located on the base side of the engaging flange 51, the rotation of the discharge spiral blade 7 is transmitted to the intermediate spiral blade 15 without any problem in strength. Further, since the two engaging protrusions 48 are always engaged with the engaging concave portions 53, the engaging protrusions 48 are engaged with the same strength as that provided with the four engaging flanges 51.

The engaging projection 48 is formed so as to project outward so as not to come into contact with the inner surface of the engaging flange portion 51 when it is rotated about the lower shaft 17, so that the engaging protrusion 48 is engaged. The tip of the protrusion 48 engages with the engaging groove 52 while contacting the side surface of the engaging flange 51 without contacting the inner surface of the engaging flange 51, and the engaging protrusion 48 and the engaging flange 51 are engaged. Prevents the inner surface from contacting and locking. Further, since the inner surface of the insertion hole portion 50 on the end edge side is formed as the tapered surface 54 so as to have a smaller diameter toward the inner side in the axial direction, the tip of the tip projection portion 47 becomes the inner surface of the insertion hole portion 50. Prevents abutment and locking.

[0017]

[Effect] The present invention comprises a fixed discharge fried-cylinder 13 and a grain tank 6 for storing grains rotatably pivoted horizontally with respect to the discharged fried-cylinder 13. 6
A discharge spiral blade 7 for laterally feeding grains to the discharge frying cylinder 13 is provided on the side, and the discharge spiral blade 7 on the discharge frying cylinder 13 side.
In the case where the intermediate spiral wing 15 that engages and disengages with
At the tip of the rotary shaft 46 of the discharge spiral blade 7, the rotary shaft 46 is attached.
The engaging projections 48, 48 are provided so as to project laterally through both sides, and an insertion hole portion 50 into which the tip of the rotary shaft 46 is inserted and engaged at the center of the rotary shaft 49 of the intermediate spiral blade 15. And a plurality of engaging flanges 51 to which the engaging projections 48 are detachably engaged are formed on one half of the end surface of the rotating shaft 49 so as to project in the direction parallel to the axis. Engagement groove 5 between
Since 2 is the combine grain discharging device in which the engaging recesses 53 are formed in one half of the remaining part where the engaging flange 51 is not provided, the area of the part where the engaging flange 51 does not exist is small, Since there is no play when the engaging projection 48 is engaged, there is an effect that the rotation of the intermediate spiral blade 15 is prevented from being impulsively transmitted to the rotating shaft 49.

[Brief description of drawings]

FIG. 1 is a side view.

FIG. 2 is a plan view.

FIG. 3 is a sectional view of a main part.

FIG. 4 is a front view of an auger metal.

FIG. 5 is a sectional view of a joint portion between an auger metal and a discharge tube.

FIG. 6 is a cross-sectional view of a joint portion between an auger metal and a discharge tube.

FIG. 7 is a cross-sectional plan view of essential parts.

FIG. 8 is a plan view of an essential part.

FIG. 9 is a side view of a main part.

FIG. 10 is a front view of a main part.

FIG. 11 is a side view of the intermediate spiral wing.

FIG. 12 is a sectional view in an engaged state.

FIG. 13 is a sectional view in an engaged state.

FIG. 14 is a side view of the second article returning device.

FIG. 15 is a sectional view of the same.

[Explanation of symbols]

1 ... Airframe frame, 2 ... Traveling device, 3 ... Driver's seat, 4 ... Threshing device, 5 ... Straw processing device, 6 ... Glen tank, 7 ... Discharge spiral blade, 8 ... Rear wall, 9 ... Discharge cylinder, 10 ... Stay, 11
… Auger metal, 12… Grain lifter discharge device, 13… Discharge lifter cylinder, 14… Discharge auger, 15… Intermediate spiral blade, 16…
Bearing, 17 ... Lower shaft, 18 ... Tip part, 19 ... Collar part, 20
... notch portion, 21 ... abutting surface, 22 ... inclined inner peripheral surface, 23 ... horizontal inner peripheral surface, 24 ... contact surface, 25 ... inclined outer peripheral surface, 26 ... horizontal outer peripheral surface, 27 ... rear support frame, 28 ... upper part Frame, 2
9 ... Rotation supporting member, 30 ... Bending portion, 31 ... Stay, 32
... Supporting member, 33 ... Upper shaft, 34 ... Upper rotating part, 35 ...
Tank rotation support frame, 36 ... Rear frame, 37 ... Horizontal frame, 3
8 ... Side wall, 39 ... Support member, 40 ... Mounting metal fitting, 41 ... Feed fried cylinder, 43 ... Casing, 44 ... Inner side wall, 45 ...
Annular collar portion, 46 ... Rotating shaft, 47 ... Tip protrusion portion, 48 ... Engaging protrusion, 49 ... Rotating shaft, 50 ... Inserting hole portion, 51 ... Engaging collar portion, 52 ... Engaging groove, 53 ... Engaging concave portion , 54 ... Tapered surface, 55 ... Second object returning device, 56 ... Cylindrical member, 57 ... Reduction spiral, 58 ... Cleaning port, 59 ... Lid member, 60 ... Opening / closing lever.

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[Procedure amendment]

[Submission date] November 19, 1991

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 8]

[Figure 9]

[Figure 3]

[Figure 7]

[Figure 10]

FIG. 11

FIG. 15

[Fig. 12]

[Fig. 13]

FIG. 14

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoji Nakai 1 Hachikura, Tobe Town, Iyo-gun, Ehime Prefecture

Claims (1)

[Claims] 1. A position-fixed discharged fried cylinder 13 and a grain tank 6 for storing grains rotatably pivoted horizontally with respect to the discharged fried cylinder 13 are provided on the side of the Glen tank 6. A discharge spiral wing 7 for laterally feeding grains to the discharge fried cylinder 13 is provided, and an intermediate spiral wing 15 that engages and disengages with the discharge spiral wing 7 is provided on the discharge fried cylinder 13 side. Engaging projections 48, 48 are formed at the tip of the rotary shaft 46 of the discharge spiral blade 7 so as to project laterally through the rotary shaft 46, and at the center of the rotary shaft 49 of the intermediate spiral blade 15. An insertion hole 50 into which the tip of the rotating shaft 46 is inserted and engaged is provided, and a plurality of engaging flanges 51 to which the engaging protrusion 48 is detachably engaged with one side half of the end face of the rotating shaft 49. Are formed so as to project in a direction parallel to the axis, and the engaging groove 5 is provided between the engaging flange portions 51.
2 is a combine grain discharging device in which engaging recesses 53 are formed in half on one side of the remaining part where the engaging flange 51 is not provided.