JP2009159830A - Grain unloading auger of combine harvester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve an expandable and contractile grain unloading auger of a combine harvester capable of efficiently transmitting rotation driving power from either of a first or a second screw to the other of the first or the second screw while preventing damage to grains. <P>SOLUTION: The grain unloading auger 9 of the combine harvester is composed so that a power transmission member 90 is installed in the first screw 40 to rotate and drive either of the first or the second screw 40 or 50 in the direction to transport the grains. Thereby, the rotation driving power from either of the first or the second screw 40 or 50 is transmitted through a second screw flight 52 and the power transmission member 90 to the other of the first or the second screw 40 or 50. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a combine grain discharge auger provided with an expansion / contraction mechanism, capable of conveying a grain from a supply port toward a discharge port, and configured to be expandable / contractible.

  As a conventional technique, for example, as disclosed in Patent Document 1, when a motor (29 in FIG. 3 in Patent Document 1) is rotated forward and backward, the rotation shaft (26 in FIG. 2 in Patent Document 1) is rotated. Then, the moving spira (21 in FIG. 2 of Patent Document 1) rotates forward and backward, and the moving spira rotates along the blades (20b in FIG. 2 of Patent Document 1) of the conveying spira (20 in FIG. 2 of Patent Document 1). A combined discharge auger configured so that the sliding cylinder (12 in FIG. 2 of Patent Document 1) can be expanded and contracted with respect to the stationary cylinder (11 in FIG. 2 of Patent Document 1) by moving while moving is known. It has been.

Japanese Patent Laid-Open No. 9-56248 (refer to FIG. 2, FIG. 3, and paragraph number “0014”)

  In the combine discharge auger of Patent Document 1, when the gear (24 in FIG. 3 of Patent Document 1) is driven to discharge the spear, the moving spira and the blades of the conveying spira are in contact with each other so as to rotate simultaneously. It is configured. In this way, when the moving spira and the blades of the transporting spiraler are brought into contact with each other and rotated, the hooks are sandwiched between the surfaces of the moving and spiraling blades, and the power from the conveying spira causes There is a problem that the heel is crushed and the heel is easily damaged. In addition, if the heel is sandwiched between the surface of the blade of the moving spira and the surface of the blade of the conveying spira, the power from the conveying spirer is transmitted to the moving spirer via the ridge, It was difficult to efficiently transmit power to the moving spira.

  The present invention provides an extendable combine harvesting grain auger capable of efficiently transmitting a rotational driving force from one of the first or second screw to the other of the first or second screw while preventing damage to the grain. It aims to be realized.

[I]
(Constitution)
The first feature of the present invention includes a cylindrical first case, a cylindrical second case configured to be slidable with respect to the first case, and the first case and the second case. A first and second screw connected in series inside the first and second cases, and a winding direction of the first screw blade of the first screw and the first 2. Combined grain configured such that the winding direction of the second screw blade of the two screws is set to the same winding direction, the grain can be conveyed along the first and second cases, and can be expanded and contracted. The discharge auger is configured as follows.
When the first screw blade is fixed to the drive shaft that rotates the first screw, the second screw blade is wound around the drive shaft, and the first and second cases are expanded and contracted by the expansion mechanism. The second screw blade moves while relatively rotating between the first screw blades adjacent to each other, and the second screw moves toward the first screw while overlapping the first screw. At the same time, when the first screw is provided with a power transmission member and one of the first or second screw is rotationally driven in the direction of conveying the grain, the rotational driving force from one of the first or second screw is generated. It is configured to be transmitted to the other of the first or second screw via the second screw blade and the power transmission member.

(Function)
According to the first feature of the present invention, the rotational driving force from one of the first or second screw can be transmitted to the other of the first or second screw via the second screw blade and the power transmission member. Accordingly, the rotational driving force from one of the first or second screw can be transmitted to the other of the first or second screw in a state where the surface of the first screw blade and the surface of the second screw blade are separated from each other. it can. As a result, for example, when the surface of the first screw blade and the surface of the second screw blade are brought into contact with each other, the rotational driving force from one of the first or second screw is transmitted to the other of the first or second screw. In comparison, the grain in the middle of conveyance is sandwiched between the surface of the first screw blade and the surface of the second screw blade, and the grain in the middle of conveyance is crushed by the rotational driving force from one of the first or second screw. Since this prevents the power from being transmitted through the grain, the rotational driving force from one of the first or second screw can be efficiently transmitted to the first or second screw via the power transmission member. Can communicate to the other.

  According to the first feature of the present invention, when the rotational driving force from one of the first or second screw is transmitted to the second screw blade, the second screw blade is connected to the second screw blade in the grain conveying direction. Thus, the second screw blade is strongly wound around the drive shaft, and the second screw blade is integrated with the drive shaft. As a result, the rotational driving force is transmitted through the second screw blade strongly wound around the driving shaft, and the rotational driving force from one of the first or second screw is applied to the other of the first or second screw. While being able to transmit efficiently, the intensity | strength of the 2nd screw in the case of conveying a grain can be improved.

(The invention's effect)
According to the first feature of the present invention, the rotational driving force from one of the first or second screw can be efficiently transmitted to the other of the first or second screw while preventing damage to the grain.

[II]
(Constitution)
The second feature of the present invention is that the combine grain discharge auger of the first feature of the present invention is configured as follows.
The power transmission member is provided at a plurality of locations in the transport direction of the first screw.

(Function)
According to the second feature of the present invention, the “action” described in the preceding item [I] is provided in the same manner as the first feature of the present invention, and in addition to this, the following “action” is provided.
According to the second feature of the present invention, the rotational driving force from one of the first or second screw can be transmitted to the other of the first or second screw via a plurality of power transmission members. Thereby, the rotational driving force from one of the first or second screw can be branched into a plurality of locations and transmitted to the other of the first or second screw. As a result, the rotational driving force from one of the first or second screw can be prevented from being biased and transmitted to the other of the first or second screw, and the rotational driving force from one of the first or second screw can be reduced. , Can be stably transmitted to the other of the first or second screw via the power transmission member.

(The invention's effect)
According to the second feature of the present invention, the “effect of the invention” described in the preceding item [I] is provided in the same manner as the first feature of the present invention. In addition, the following “effect of the invention” is provided. ing.
According to the second feature of the present invention, the rotational driving force from one of the first or second screw can be transmitted to the other of the first or second screw more efficiently.

[III]
(Constitution)
The third feature of the present invention resides in the following configuration in the combine grain discharge auger of the first feature or the second feature of the present invention.
The power transmission member is configured by including a roller supported on the drive shaft so as to be rotatable around a radial axis.

(Function)
According to the third feature of the present invention, the “action” described in the preceding item [I] [II] is provided in the same manner as the first feature or the second feature of the present invention. Is provided.
According to the third feature of the present invention, the rotational driving force from one of the first or second screw is transmitted to the other of the first or second screw via a roller rotatably supported by the drive shaft. . In this case, since the roller is rotatably supported around the radial axis of the drive shaft, even if there is a grain in the middle of conveyance between the roller and the second screw blade, the roller Turns slightly and touches the second screw blade without difficulty. Thereby, it can prevent that a grain is pinched | interposed between a roller and a 2nd screw blade, and can transmit the rotational driving force from one side of a 1st or 2nd screw to the other of a 1st or 2nd screw without difficulty.

  According to the third aspect of the present invention, when the first and second cases are shortened by the expansion / contraction mechanism, the second screw blade is in contact with the roller of the power transmission member and guided between the adjacent first screw blades. Move with relative rotation. Thereby, a power transmission member can be used also as a guide member in shortening a grain discharge auger.

(The invention's effect)
According to the third feature of the present invention, the “effect of the invention” described in the preceding paragraphs [I] and [II] is provided in the same manner as the first feature or the second feature of the present invention. “Effect of the invention” is provided.
According to the third feature of the present invention, the rotational driving force from one of the first or second screw can be more efficiently transmitted to the other of the first or second screw, and the grain discharge auger can be shortened without difficulty.

[Overall configuration of combine]
Based on FIG.1 and FIG.2, the whole structure of the self-desorption type combine provided with the horizontal auger 9 (equivalent to a grain discharge auger) which concerns on this invention is demonstrated. FIG. 1 is an overall side view of a self-removing combine, and FIG. 2 is an overall plan view of the self-removing combine.

  As shown in FIG.1 and FIG.2, the cutting part 3 is provided in the front part of the traveling body 2 provided in the upper part of the crawler traveling apparatus 1, and the steering part 4 and the harvested cereal meal are threshed and selected in the traveling body 2. The self-decomposing combine is configured by including a threshing unit 5, a Glen tank 6 that stores the grain supplied from the threshing unit 5, an unloader 7 that discharges the grain out of the machine from the Glen tank 6, and the like.

  The unloader 7 includes a vertical auger 8 that guides the grains upward from the discharge screw 11 at the lower part of the grain tank 6, and a horizontal auger 9 that discharges the grains from the upper part of the vertical auger 8 to a truck bed (not shown). The unloader 7 is raised by operating a hydraulic cylinder 12 provided between the vertical auger 8 and the horizontal auger 9, and a swing motor 13 provided in a lower case 14 below the vertical auger 8 is provided. The unloader 7 can be turned by rotating.

  The vertical auger 8 is rotatably connected to the lower case 14 connected to the rear end portion of the discharge screw 11 below the Glen tank 6, an outer case 15 extending upward from the lower case 14, and the outer case 15. It is configured to include a supported vertical feed screw 16 and the like, and is configured to be able to convey the grain conveyed rearward from the discharge screw 11 below the Glen tank 6 and supply it to the horizontal auger 9. Yes.

  The discharge screw 11 at the lower part of the Glen tank 6 is connected to the vertical feed screw 16 of the vertical auger 8 via the bevel transmission mechanism 17 inside the lower case 14, and the vertical feed screw 16 of the vertical auger 8 is connected to the upper case 18. Is coupled to a drive shaft 41 of a lateral auger 9 described later via a bevel transmission mechanism 19. By comprising in this way, the discharge screw 11 of the lower part of the Glen tank 6 via the transmission case (not shown) located between the Glen tank 6 and the threshing part 5 with the motive power from an engine (not shown). Is rotated, the longitudinal feed screw 16 is rotated via the bevel transmission mechanism 17, and the first and second conveying screws 20, 21 of the lateral auger 9 are further rotated via the bevel transmission mechanism 19. It is configured.

  By configuring as described above, the grain stored in the Glen tank 6 is conveyed to the rear of the machine body by the discharge screw 11, conveyed upward by the vertical auger 8, and supplied to the supply port 9 a of the horizontal auger 9. The grain is guided to the discharge port 9b at the tip of the horizontal auger 9 by the first and second conveying screws 20 and 21 provided inside the auger 9, and the grain is transferred from the discharge port 9b to a truck bed (not shown). The unloader 7 is configured so as to be discharged.

[Detailed structure of horizontal auger (equivalent to grain discharge auger)]
The detailed structure of the horizontal auger 9 (corresponding to a grain discharge auger) will be described with reference to FIGS. 3 is a longitudinal sectional view showing the entire structure of the horizontal auger 9, and FIG. 3 (a) is a longitudinal sectional view in the expansion / contraction direction (conveying direction) of the lateral auger 9 in the most extended state. (B) is a longitudinal cross-sectional view in the expansion-contraction direction of the horizontal auger 9 in the most shortened state. 4 to 6 are detailed longitudinal sectional views of the horizontal auger 9 at the positions A to C in the state of FIG. 3A, and FIGS. 7 and 8 are views of D in the state of FIG. 4 is a detailed longitudinal sectional view of the horizontal auger 9 at positions E and E. FIG. FIG. 9 is a longitudinal sectional view of the vicinity of the slide member 25.

  10 is a plan view of the vicinity of the expansion / contraction mechanism 70, FIG. 11 is a longitudinal side view of the vicinity of the expansion / contraction mechanism 70, and FIG. 12 is a vertical sectional view of the vicinity of the expansion / contraction mechanism 70 viewed from the downstream side of conveyance. FIG. 13 is a perspective view of the vicinity of the anti-rotation mechanism 30, and FIG. 14 is a vertical side view for explaining the support structure of the second case 24.

  As shown in FIG. 3, the horizontal auger 9 includes a cylindrical first case 23 connected to an upper case 18 positioned at a connecting portion between the vertical auger 8 and the horizontal auger 9, and the first case 23 in a telescopic direction. A cylindrical second case 24 fitted in a slidable manner, and first and second transfer screws 20 and 21 provided inside the first and second cases 23 and 24 are configured.

  As shown in FIG. 5, a cylindrical slide member 25 is fixed to the end of the second case 24 on the upstream side of the transport in a state of being fitted into the second case 24. The outer diameter of the slide member 25 is set to be smaller than the inner diameter of the first case 23, and the slide member 25 is fitted into the first case 23 via the collar 26. The inner surface of the end of the slide member 25 on the upstream side is tapered, and when the second case 24 slides relative to the first case 23, the first case 23 changes to the second case 24. It is configured to be able to guide the grain without difficulty. Thereby, the second case 24 can be slid and moved with respect to the first case 23 without difficulty.

  Next, the detailed structure of the 1st conveyance screw 20 is demonstrated based on FIGS. As shown in FIG. 3, the first transport screw 20 includes a first screw 40 positioned on the transport upstream side of the first case 23 and a second screw 50 positioned on the transport downstream side of the first screw 40. It is configured.

  As shown in FIGS. 4 and 5, the first screw 40 constituting the first transport screw 20 includes a drive shaft 41 and a spiral first screw blade 42 fixed to the outer peripheral portion of the drive shaft 41. It is prepared for.

  A boss portion 18 a is integrally formed in the upper case 18, and a bevel gear 19 a of a bevel transmission mechanism 19 is rotatably supported by the boss portion 18 a via a bearing 44. A support shaft 43 is inserted and fixed to the bevel gear 19 a, whereby the power from the longitudinal feed screw 16 of the vertical auger 8 is transmitted to the support shaft 43 via the bevel transmission mechanism 19.

  The drive shaft 41 is formed in a cylindrical shape, and a cover 41a is fixed to the conveyance upstream end of the drive shaft 41. The cover 41a is externally fitted to the boss portion 18a of the upper case 18. The end portion on the upstream side of the drive shaft 41 is connected to the support shaft 43 by a connecting bolt 45 so as to be integrally rotatable. Thereby, when the support shaft 43 is rotationally driven via the bevel transmission mechanism 19 by the power from the longitudinal feed screw 16 of the vertical auger 8, the drive shaft 41 is configured to rotate integrally with the support shaft 43.

  The drive shaft 41 includes a transport upstream portion to which the first screw blade 42 is fixed, and a transport downstream portion that extends from the transport upstream portion to the transport downstream side. A spiral first screw blade 42 is wound around the upstream portion of the drive shaft 41 in the conveying direction and is fixed over the entire length thereof. A parallel surface 41A that engages with the parallel surface 54A of the connecting member 54 is formed (see FIG. 9).

  As shown in FIG. 5, the second screw 50 constituting the first transport screw 20 includes a cylindrical member 51 and a spiral second screw blade having a transport downstream end fixed to the cylindrical member 51. 52.

  As shown in FIGS. 5 and 9, an arm portion 25a formed integrally with the slide member 25 extends downward from the upper portion of the slide member 25, and a bearing member 25b is supported on the arm portion 25a. . A cylindrical connecting member 54 is rotatably supported on the bearing member 25 b via a bearing 53.

  A parallel surface 54A is formed on the inner peripheral surface of the connecting member 54 formed in a columnar shape, and the parallel surface 54A is engaged with a parallel surface 41A formed on the outer peripheral surface of the drive shaft 41. . As a result, the drive shaft 41 is supported so as to be able to rotate integrally with the connecting member 54 and to be slidable in the telescopic direction with respect to the connecting member 54.

  As shown in FIG. 5, a cylindrical member 51 of the second screw 50 is rotatably fitted on the upstream side of the connection of the connecting member 54 via a sliding bearing 55. Thus, the end portion of the second screw 50 on the downstream side of the conveyance is supported so as to be rotatable relative to the drive shaft 41 and integrally movable with the second case 24 in the expansion / contraction direction.

  The end of the second screw blade 52 on the downstream side of conveyance is fixed to the cylindrical member 51, and the portion other than that fixed to the cylindrical member 51 is downstream of conveyance of the drive shaft 41 on which the parallel surface 41 is formed. The side portion is wound around a predetermined gap (a small gap that allows the second screw blade 52 to slide with respect to the drive shaft 41 without difficulty).

  Next, the detailed structure of the 2nd conveyance screw 21 is demonstrated based on FIG.5 and FIG.6. As shown in FIG.5 and FIG.6, the 2nd conveyance screw 21 is provided in the conveyance downstream of the 1st conveyance screw 20, and the grain conveyed by the 1st conveyance screw 20 to the 2nd case 24 is 2nd case. It is comprised so that it may convey toward 24 conveyance downstream. A discharge port 9b opened downward is formed at an end of the second case 24 on the downstream side of conveyance, and the grains conveyed by the first and second conveyance screws 20 and 21 are discharged from the discharge port 9b. It is comprised so that it can discharge below from.

  The second conveying screw 21 includes a cylindrical cylindrical member 56 and a helical screw blade 57 that is wound and fixed over the entire length of the outer peripheral portion of the cylindrical member 56. .

  The end of the cylindrical member 56 on the upstream side of the conveyance is fitted and fixed to the downstream side of the conveyance of the connecting member 54. When the expansion / contraction mechanism 70 is expanded / contracted, the drive shaft 41 of the first screw 40 is connected to the cylindrical member 56. The end portion on the upstream side of the cylindrical member 56 is opened so that the inside of the cylinder member 56 can move in the telescopic direction. On the other hand, a support shaft 56 a extends from the end of the cylindrical member 56 on the downstream side of conveyance, and this support shaft 56 a is rotatably supported by the second case 24 via a bearing 58.

  By configuring the second transport screw 21 as described above, when the drive shaft 41 of the first screw 40 rotates via the bevel transmission mechanism 19 and the support shaft 43, the second transport screw 21 is also connected via the connecting member 54. It is configured to rotate integrally and be able to transport the grains transported to the second case 24 toward the discharge port 9b provided at the transport downstream side end of the second case 24.

  Next, the detailed structure of the grain spill prevention device 60 will be described with reference to FIG. As shown in FIG. 6, at the end of the second conveying screw 21 on the downstream side of the conveyance, grain spill prevention that prevents the discharge (spillage) of the grain from the outlet 9b in the state where the grain is not conveyed. A device 60 is provided. The grain spill prevention device 60 includes a slide member 61, a spill prevention plate 62, a stop member 63, and an elastic spring 64.

  A cylindrical slide member 61 is externally fitted to the cylindrical member 56 of the second conveying screw 21 so as to be slidable in the extending and contracting direction. 62 is fixed. The spill prevention plate 62 is formed in a disk shape, and its outer diameter is set to a dimension smaller than the inner diameter of the second case 24 by a predetermined dimension. That is, the gap between the inner peripheral surface of the second case 24 and the outer peripheral end of the spill prevention plate 62 is smaller than the size of one grain in a state where the grain is not discharged (the state of the solid line in FIG. 6). It is set to a certain extent.

  A disc-shaped stop member 63 is fixed to an end portion of the cylindrical member 56 on the downstream side of conveyance, and an elastic spring 64 is mounted across the stop member 63 and the spill prevention plate 62. The elastic spring 64 is composed of a compression spring, is fitted around the slide member 61, is received and supported by the stop member 63, and spills in a state where the grain is not conveyed (solid line state in FIG. 6). The free length of the elastic spring 64 is set so that a predetermined spring reaction force that pushes the prevention plate 62 to the upstream side of the conveyance acts.

  By configuring the grain spill prevention device 60 as described above, the grain is transported by the first and second transport screws 20 and 21, and the spill prevention plate 62 is transported downstream by the transport force of the grain. When pushed, the elastic spring 64 contracts and the spill prevention plate 62 automatically moves in the direction of the open position indicated by the two-dot chain line in FIG. 6 according to the grain conveyance amount (grain conveyance force), The grain is discharged from the discharge port 9b. On the other hand, when the conveyance of the grains by the first and second conveying screws 20 and 21 is stopped, the urging force of the elastic spring 64 acts and the spill prevention plate 62 automatically moves to the closed position shown by the solid line in FIG. In this state, the grain discharge to the discharge port 9b is blocked by the spill prevention plate 62. Since the spill prevention plate 62 is configured so that the urging force of the predetermined elastic spring 64 acts even in the closed position, the spill prevention plate 62 reliably discharges the grain from the outlet 9b when the grain is not conveyed. Can be prevented.

  A cover portion 24a is formed at the distal end portion of the second case 24, and a work lamp 65F is provided inside the cover portion 24a. Thereby, the discharge position of the grain discharged from the discharge port 9b of the horizontal auger 9 is brightly illuminated by the work lamp 65F, and the discharge port 9b of the horizontal auger 9 can be accurately positioned on the truck bed or the like. .

  Next, the detailed structure of the telescopic mechanism 70 will be described with reference to FIGS. As shown in FIGS. 10 to 12, an expansion / contraction mechanism 70 for extending / contracting the lateral auger 9 is provided across the first case 23 and the second case 24. When the expansion / contraction mechanism 70 is operated, the second case 24 is provided. Is configured such that the length of the horizontal auger 9 can be adjusted by moving relative to the first case 23.

  A U-shaped bracket 34 that opens upward is fixed to the upper end of the downstream end of the first case 23, and a resin-made slide member 35 extends in the telescopic direction from above to the bracket 34. It is mounted with restricted movement. A slide rail 36 in which a plurality of engagement grooves 36 a are processed is fitted into the slide member 35 from above.

  The slide rail 36 is formed in a U shape whose longitudinal cross-sectional shape is opened downward, and an end portion on the downstream side of the conveyance is fixed to an upper end portion of the second case 24 via a bracket 37, and an end on the upstream side of the conveyance The portion is fitted and attached from above to a slide member 35 fixed to the upper end of the first case 23, and is supported so as to be slidable in the expansion and contraction direction. Thus, when the second case 24 slides relative to the first case 23 by operating the telescopic mechanism 70, the slide rail 36 slides along the slide member 35 together with the second case 24. .

  A bracket 71 is fixed to the upper side of the downstream end of the first case 23 on the conveyance side, and the extension and shortening electric motors 72 and 73 incorporating a reduction gear (not shown) are attached to the bracket 71. . Extending and shortening side drive gears 72b and 73b are fixed to output shafts 72a and 73a of the extending and shortening electric motors 72 and 73, respectively. A lateral support shaft 74 is rotatably supported on the bracket 71, and an intermediate gear 75 that is engaged with the extension side and shortening side drive gears 72b and 73b is integrally formed on the support shaft 74.

  A telescopic gear 76 is connected to the distal end portion of the support shaft 74 so as to be able to rotate integrally with the support shaft 74, whereby the power from the output shafts 72 a and 73 a of the electric motors 72 and 73 for extension and shortening is received. The telescopic gear 76 is configured to be transmitted through the intermediate gear 75 and the support shaft 74.

  The telescopic gear 76 is configured to engage with the engaging groove 36a of the slide rail 36 fitted and attached to the slide member 35 from above, and extends an auger operation remote controller (not shown) provided in the control unit 4. When the electric motor 72 for extension is driven by operating to the side, the telescopic gear 76 rotates counterclockwise in FIG. 11 via the drive gear 72b. Then, the slide rail 36 slides along the slide member 35 toward the conveyance downstream side, and the second case 24 moves toward the conveyance downstream side with respect to the first case 23 to extend the lateral auger 9. On the other hand, when the shortening electric motor 73 is driven by operating the auger operation remote controller provided in the control unit 4 to the shortening side, the telescopic gear 76 rotates clockwise in FIG. 11 via the drive gear 73b. Then, the slide rail 36 slides along the slide member 35 toward the transport upstream side, and the second case 24 moves toward the transport upstream side with respect to the first case 23, so that the lateral auger 9 can be shortened.

  Dogs 77F and 77R are mounted on the upper surface side of both ends in the expansion / contraction direction of the slide rail 36 so that the position thereof can be adjusted, and the bracket 71 is equipped with limit switches 78F and 78R as expansion / contraction position detecting means. Yes.

  When the extension electric motor 72 is driven and the dog 77R provided on the slide rail 36 comes into contact with the operation portion of the limit switch 78R and the operation portion swings within a predetermined range, the limit switch 78R is turned from ON to OFF (or OFF). To ON). Thereby, the stop means which detects the position which the horizontal auger 9 extended most by the limit switch 78R, and stops the electric motor 72 for expansion | extension automatically in the position where the horizontal auger 9 extended most is comprised.

  On the other hand, when the shortening electric motor 73 is driven and the dog 77F provided on the slide rail 36 comes into contact with the operation portion of the limit switch 78F and the operation portion swings within a predetermined range, the limit switch 78F is turned from ON to OFF ( Or switch from OFF to ON). As a result, a stop means for detecting the position at which the horizontal auger 9 is shortened most by the limit switch 78F and automatically stopping the shortening electric motor 72 at the position at which the horizontal auger 9 is shortened most is configured.

  As described above, the position where the horizontal auger 9 is most extended and the position where the horizontal auger 9 is most shortened is detected by the limit switches 78F and 78R, and the electric motors 72 and 73 for extension and shortening are automatically stopped. Therefore, compared with the case where the most extended position and the most shortened position of the horizontal auger 9 are restricted, the extension and shortening electric motors 72 and 73 are immediately stopped at the position where the horizontal auger 9 is most extended and the most shortened position. It is possible to prevent an excessive load from acting on the horizontal auger 9. Thereby, the breakage of the horizontal auger 9 due to overload can be prevented, and the durability of the horizontal auger 9 can be improved.

  A protective cover (not shown) is detachably attached to the bracket 71. With this protective cover, the extension and shortening electric motors 72 and 73, limit switches 78F and 78R, the slide member 35, and the like attached to the bracket 71 are provided. Can be protected from above and from the side. Thereby, it is possible not only to prevent breakage or rusting of the equipment or the like mounted on the bracket 71, but also to improve the appearance of the horizontal auger 9.

  A work lamp (not shown) is attached to the lateral side of the telescopic mechanism 70 so that the irradiation angle can be changed and adjusted, and the discharge position of the grains discharged from the discharge port 9b of the horizontal auger 9 is brightened obliquely by this work lamp. In light of this, the discharge port 9b of the horizontal auger 9 can be accurately positioned on the truck bed or the like in cooperation with the work lamp 65F attached to the tip of the horizontal auger 9.

  Next, a support structure for the second case 24 will be described with reference to FIGS. 3, 12, and 14. As shown in FIGS. 12 and 14, a pair of fixing brackets 27 are fixed to the lower side of the conveyance downstream end of the first case 23, and a roller 28 a is attached to each of the pair of fixing brackets 27. A roller bracket 28 that is rotatably provided is attached via a spacer 29 so that its position can be adjusted. Thereby, by changing the thickness of the spacer 29, the position of the roller bracket 28 relative to the fixed bracket 27 can be changed and adjusted, and the height of the roller 28a supporting the second case 24 can be changed and adjusted. As a result, with the second case 24 fitted in the first case 23, the outer peripheral surface of the second case 24 is brought into contact with the outer peripheral surface of the roller 28a, and the second case 24 is stabilized by the left and right rollers 28a. In addition to being able to support, when the second case 24 slides relative to the first case 23, the roller 28a rotates and can be expanded and contracted without difficulty. Further, when the support height of the second case 24 by one or both of the rollers 28a is changed due to, for example, wear of the rollers 28a, the roller 28a is not changed by changing the number of the spacers 29. However, the height of the roller 28a that supports the second case 24 can be changed and adjusted.

  As shown in FIG. 3, the second case 24 is supported at three points on the first case 23 side by the position of the slide member 25 and the position of the pair of rollers 28a. The load acting on the connecting portion between the second case 24 and the first case 23 can be reasonably supported by the weight of the screw 21 and the weight of the conveyed grain. Further, even when the horizontal auger 9 is extended most (the slide member 25 is closest to the roller 28a side), the length between the slide member 25 and the roller 28a in the expansion / contraction direction can be secured to a predetermined length. In addition, the lengths of the first and second cases 23 and 24 are set. Thereby, the second case 24 and the like can be stably supported in the state in which the horizontal auger 9 is most extended.

  Next, the detailed structure of the anti-rotation mechanism 30 will be described with reference to FIGS. As shown in FIGS. 11 to 13, the anti-rotation mechanism 30 is provided across the first case 23 and the second case 24. The anti-rotation mechanism 30 includes a plate-like member 23a fixed to the lower end portion of the end portion of the first case 23 on the downstream side of conveyance, an anti-rotation member 31 fixed to the plate-like member 23a, and a second case. 24 and a band-plate-like regulating member 32 that is fixed to the lower side portion of the belt 24 and that is long in the expansion and contraction direction.

  When the first and second conveying screws 20 and 21 are rotated in the direction in which the grains are conveyed to the discharge port 9b, the inertia force generated by rotating the first and second conveying screws 20 and 21 is the second case 24. Act on. And although the 2nd case 24 tries to rotate in the direction which conveys a grain to the discharge port 9b with respect to the 1st case 23, the edge part inside the regulating member 32 provided in the 2nd case 24 side is 1st. The rotation of the second case 24 relative to the first case 23 is prevented by contacting the contact member 31a of the anti-rotation member 31 provided on the case 23 side.

  As a result, for example, the second case 24 rotates relative to the first case 23 and an excessive torsional stress acts on the second case 24, the first and second conveying screws 20, 21, the slide rail 36, and the like. This can prevent the breakage of the horizontal auger 9. Further, it is possible to prevent the direction of the discharge port 9b of the horizontal auger 9 and the direction of the work lamp 65F attached to the distal end portion of the horizontal auger 9 from being changed.

[Detailed structure of power transmission member]
Based on FIGS. 15-17, the detailed structure of the power transmission member 90 with which the 1st screw 40 was equipped is demonstrated. 15 is a side view of the vicinity of the power transmission member 90, and FIG. 16 is a plan view of the vicinity of the power transmission member 90. 17 is a longitudinal sectional view of the vicinity of the power transmission member 90 viewed from the upstream side of the conveyance, and FIG. 17A is a longitudinal sectional view of the vicinity of the power transmission member 90 on the upstream side of the conveyance (the left side of FIGS. FIG. 17B is a longitudinal sectional view of the vicinity of the power transmission member 90 on the downstream side of conveyance (the right side in FIG. 15 and FIG. 16). 15 and 16 are detailed views in the vicinity of the power transmission member 90 of the lateral auger 9 in the most extended state.

  As shown in FIGS. 15 to 17, two through holes are formed in the drive shaft 41 of the first screw 40, and pins 91 are fitted and inserted so as to communicate with the through holes. A flange 91a is formed at one end of the pin 91, and an attachment groove 91b is formed at the other end. The pin 91 is fitted into the through hole from the other end side where the attachment groove 91b is formed. The power transmission member 90 is configured by inserting a resin roller 92 that is not easily worn on the other end side with a stopper 93. The roller 92 may be made of a different material. For example, the roller 92 may be made of a metal wear-resistant material.

  A contact inclined surface 91A for contact with the second screw blade 52 is formed on the outer peripheral portion of the flange portion 91a of the pin 91, and a contact inclination for contacting the second screw blade 52 with the outer peripheral portion of the roller 92. A surface 92A is formed. Thereby, the flange part 91a of the pin 91 and the roller 92 can be contact | abutted to the 2nd screw blade | wing 52 by the surface instead of a point.

  As shown in FIG. 17, the position of the pin 91 on which the power transmission member 90 is mounted with respect to the first and second screw blades 42, 52 is the second screw blade shown by the contact inclined surface 92 </ b> A of the roller 92 as a solid line in FIG. 17. The second screw blade 52 is set so as to be positioned on the opposite side of the first screw blade 42 with respect to the drive shaft 41 in a state where the second screw blade 52 is in contact with the driving shaft 41. Note that the positions of the pin 91 on which the power transmission member 90 is mounted with respect to the first and second screw blades 42 and 52 may be set to different positions.

  As shown in FIGS. 17A and 17B, the first screw 40 is moved in the direction in which the grain is conveyed to the discharge port 9b (clockwise on the paper indicated by the black arrows in FIGS. 17A and 17B). When rotationally driven, the power transmission member 90 rotates in a direction integrally with the first screw 40 to convey the grain to the discharge port 9 b, and the contact inclined surface 92 A of the roller 92 of the power transmission member 90 becomes the second screw blade 52. Get in touch. Thereby, the rotational driving force from the 1st screw 40 can be transmitted to the 2nd screw blade | wing 52 of the 2nd screw 50, and the 2nd screw 50 can be rotated. In this case, since the power transmission member 90 on the upstream side of the conveyance and the power transmission member 90 on the downstream side of the conveyance are provided, the power transmission members 90 and 90 on the upstream side of the conveyance and the power transmission members 90 and 90 on the downstream side are separated from the second screw 50. Can be stably transmitted to the first screw 40. Thereby, the 1st and 2nd screws 40 and 50 can be rotationally driven without difficulty with comparatively small power.

  When the expansion / contraction mechanism 70 is extended while the drive shaft 41 is stopped, the expansion / contraction mechanism 70 pulls the second screw 50 toward the conveyance downstream side, and the two-dot chain line in FIGS. 17 (a) and 17 (b). As shown, the second screw blade 52 moves to the conveyance downstream side and contacts the contact inclined surface 91A of the flange portion 91a of the pin 91 from the conveyance upstream side. Then, the direction in which the second screw blade 52 conveys the grain to the discharge port 9b with respect to the first screw 40 (the counterclockwise direction shown in FIG. 17A and FIG. 17B by the white arrow). It moves (retreats) to the downstream side of conveyance while rotating relatively. In this case, since the pin 91 is rotatably supported by the drive shaft 41, the pin 91 is rotated by the movement of the second screw blade 52, and the second screw blade 52 is guided by the flange portion 91a without difficulty. It can be moved downstream of the conveyance. Thereby, the horizontal auger 9 can be extended without difficulty with relatively small power.

  When the telescopic mechanism 70 is shortened while the drive shaft 41 is stopped, the expansion mechanism 70 exerts a force to push the second screw 50 to the transport upstream side, and the second screw blade 52 moves to the transport upstream side to move the roller. 92 is in contact with the contact inclined surface 92A from the downstream side of the conveyance (in the case where the second screw blade 52 is already in contact with the contact inclined surface 92A of the roller 92 with the drive shaft 41 stopped). The second screw blade 52 does not move to the upstream side of conveyance). Then, the second screw blade 52 conveys the grain with respect to the first screw 40 while relatively rotating in the direction in which the grain is conveyed to the discharge port 9b (clockwise as shown by the black arrows in FIGS. 17A and 17B). Move upstream (enter). In this case, since the roller 92 is rotatably supported by the drive shaft 41, the roller 92 is rotated by the movement of the second screw blade 52, and the second screw blade 52 is conveyed without difficulty while being guided by the roller 92. It can be moved upstream. Thereby, the horizontal auger 9 can be shortened without difficulty with relatively small power.

[Horizontal auger expansion and contraction]
The expansion / contraction state of the horizontal auger 9 will be described with reference to FIGS. As shown in FIGS. 3 to 8, with the drive shaft 41 stopped, the first and second cases 23, 24 are shortened by the expansion / contraction mechanism 70 so that the second case 24 is conveyed upstream of the first case 23. When the second screw blade 52 of the second screw 50 is slid to the side, the second screw blade 52 enters the first screw 40 while rotating relative to the first screw 40 in the direction of conveying the grains to the discharge port 9b. One transport screw 20 is shortened.

  On the other hand, when the first and second cases 23 and 24 are extended by the expansion / contraction mechanism 70 in a state where the drive shaft 41 is stopped, the second case 24 is slid to the transport downstream side with respect to the first case 23. The second screw blade 52 of the screw 50 moves relative to the first screw 40 relative to the downstream side while rotating relative to the first screw 40 in the direction opposite to the direction in which the grain is conveyed to the discharge port 9b. Elongate.

  Further, when the drive shaft 41 rotates without operating the telescopic mechanism 70 and the first screw 40 rotates, the power of the first screw blade 42 is transmitted to the second screw blade 52 via the power transmission member 90, The second screw 50 rotates integrally with the first screw 40.

  In this case, when the power of the first screw blade 42 is transmitted to the second screw blade 52 via the power transmission member 90, the power from the power transmission member 90 is transmitted to the second screw blade 52, and the grain is removed. The force twisted in the direction of conveyance to the discharge port 9b acts on the second screw blade 52 (for example, when the lateral auger 9 is in the most extended state, the second screw blade 52 extends over substantially the entire length of the second screw blade 52. Twisting force is applied). Then, the second screw blade 52 is strongly wound around the drive shaft 41, and the second screw blade 52 rotates in a state of being integrated with the drive shaft 41.

  As a result, the rotational driving force from the drive shaft 41 is transmitted through the portion of the second screw blade 52 strongly wound around the drive shaft 41, and the rotational driving force from the drive shaft 41 is transmitted to the second screw blade 52. Can be transmitted efficiently. Further, the strength of the second screw blade 52 that is strongly wound around the drive shaft 41 can be improved, and the strength of the second screw blade 52 in which only the end portion on the downstream side of the conveyance is fixed to the cylindrical member 51 is improved. Can do.

  As shown in FIG. 3, when the second case 24 moves to the upstream side of the first case 23 by the telescopic mechanism 70 from the state in which the horizontal auger 9 is most extended (state of FIG. 3A), the drive shaft 41 relatively moves inside the cylindrical member 56 toward the conveyance downstream side. And the length of the 1st conveyance screw 20 except the drive shaft 41 becomes short, and the 2nd screw 50 of the 1st conveyance screw 20 is pushed in the conveyance upstream. Then, the second screw 50 of the first transport screw 20 rotates relative to the first screw 40 of the first transport screw 20 in the direction of transporting the grains to the discharge port 9b, and the first of the first transport screw 20 is rotated. The horizontal auger 9 is shortened by entering the screw 40.

  On the other hand, when the second case 24 is moved downstream of the first case 23 with respect to the first case 23 by the expansion / contraction mechanism 70 from the state in which the horizontal auger 9 is shortened most (the state shown in FIG. 3B), the drive shaft 41 is a cylindrical member. The inside of 56 is moved relative to the conveyance upstream side. And the length of the 1st conveyance screw 20 except the drive shaft 41 becomes long, and the 2nd screw 50 of the 1st conveyance screw 20 is pulled to the conveyance downstream side. And since the 2nd screw 50 of the 1st conveyance screw 20 is supporting the end part of the conveyance downstream to the 2nd case 24 side, only the 2nd screw 50 of the 1st conveyance screw 20 is in the conveyance downstream. While moving relatively, the second screw 50 retreats while rotating relative to the first screw 40 in the direction opposite to the direction in which the grain is conveyed to the discharge port 9b, and the horizontal auger 9 extends.

  As a result, as shown in FIG. 3, the second screw 50 of the first transport screw 20 moves relative to the first screw 40 of the first transport screw 20 by a length L, so that the first transport screw 20 is long. The horizontal auger 9 expands and contracts by a length L.

[First Alternative Embodiment of the Invention]
Instead of the power transmission member 90 in the above-mentioned [Best Mode for Carrying Out the Invention], a power transmission member 90 as shown in FIG. 18 may be configured. 18 is a longitudinal sectional view of the vicinity of the power transmission member 90 viewed from the upstream side of the conveyance, FIG. 18A is a longitudinal sectional view of the vicinity of the power transmission member 90 on the upstream side of the conveyance, and FIG. It is a longitudinal cross-sectional view near the power transmission member 90 on the conveyance downstream side.

  As shown in FIG. 18, a through hole is formed in the drive shaft 41 of the first screw 40, and a pin 91 is fitted and inserted so as to communicate with the through hole. A flange 91a is formed at one end of the pin 91, an attachment groove 91b is formed at the other end, and the pin 91 on which the roller 92 is mounted from the other end side where the attachment groove 91b is formed. The power transmission member 90 provided with the roller 92 at both ends of the pin 91 is configured by inserting into the through hole and mounting the roller 92 with the stopper 93 on the other end side.

  A contact inclined surface 92 </ b> A with which the second screw blade 52 contacts is formed on the outer peripheral portion of the roller 92 at both ends. Thereby, the roller 92 can be brought into contact with the second screw blade 52 not at a point but at a surface.

  When the expansion / contraction mechanism 70 is extended with the drive shaft 41 stopped, a force that pulls the second screw 50 to the downstream side of the conveyance by the expansion / contraction mechanism 70 acts, and the two-dot chain line in FIGS. 18 (a) and 18 (b). As shown, the second screw blade 52 moves to the downstream side of conveyance and contacts the contact inclined surface 92A of the roller 92 on the other end side from the upstream side of conveyance. Then, the direction in which the second screw blade 52 conveys the grain to the discharge port 9b with respect to the first screw 40 (the counterclockwise direction shown in FIG. 18A and FIG. 18B by the white arrow). It moves (retreats) to the downstream side of conveyance while rotating relatively. In this case, since the roller 92 is rotatably supported by the pin 91, the roller 92 is rotated by the movement of the second screw blade 52, and the second screw blade 52 is guided by the roller 92 without being forced to be conveyed downstream. Can be moved to the side. Thereby, the horizontal auger 9 can be further expanded and contracted more easily by the roller 92 provided at the other end of the pin 91.

  Further, since the power transmission member 90 is mounted on the drive shaft 41 so that a gap is formed between the roller 92 mounted on the other end side and the first screw blade 42, the telescopic mechanism 70 is extended. In this case, the roller 92 can be rotated without difficulty.

[Second Embodiment of the Invention]
A power transmission member 90 as shown in FIG. 19 may be configured instead of the power transmission member 90 in [Best Mode for Carrying Out the Invention] and [First Alternative Embodiment of the Invention]. FIG. 19 is a longitudinal sectional view of the vicinity of the power transmission member 90 viewed from the upstream side of conveyance.

  As shown in FIG. 19, the drive shaft 41 of the first screw 40 is formed with a pair of through holes arranged in the expansion / contraction direction, and a pin 91 is fitted and inserted so as to communicate with the through holes. A flange 91a is formed at one end of the pin 91, and an attachment groove 91b is formed at the other end. The pin 91 is fitted into the through hole from the other end side where the attachment groove 91b is formed. The power transmission member 90 is configured by inserting and attaching the roller 92 to the other end side with the stopper 93.

  The contact inclined surfaces 92A and 92A of the pair of rollers 92 and 92 are disposed so as to sandwich the second screw blade 52 from both sides, and the second screw blade 52 is sandwiched by the pair of rollers 92 and 92 from both sides. The horizontal auger 9 is configured to expand and contract in the state.

  As shown in FIG. 19, when the first screw 40 is rotationally driven in the direction in which the grain is conveyed to the discharge port 9 b (clockwise on the paper indicated by the black arrow in FIG. 19), the power transmission member 90 is connected to the first screw 40. The rotation force from the first screw 40 is driven by the second screw 50 of the second screw 50 through the contact inclined surface 92A of the roller 92 on the right side of the paper. The second screw 50 can be rotated by being transmitted to the blade 52.

  When the expansion / contraction mechanism 70 is extended in a state where the drive shaft 41 is stopped, a force for pulling the second screw 50 to the transport downstream side by the expansion / contraction mechanism 70 acts. Then, the second screw blade 52 is guided by the two rollers 92 in a state where the second screw blade 52 is sandwiched between the two rollers 92 on the right side and the left side of the paper surface, and the second screw blade 52 causes the first screw 40 to receive grains. It moves (retreats) to the downstream side of the conveyance while relatively rotating in the direction opposite to the direction of conveyance to the discharge port 9b (counterclockwise as indicated by the white arrow in FIG. 19).

  On the other hand, when the expansion / contraction mechanism 70 is shortened in a state where the drive shaft 41 is stopped, a force that pushes the second screw 50 to the upstream side of the conveyance by the expansion / contraction mechanism 70 acts. Then, the second screw blade 52 is guided by the two rollers 92 in a state where the second screw blade 52 is sandwiched between the two rollers 92 on the right side and the left side of the paper surface, and the second screw blade 52 causes the first screw 40 to receive grains. It moves (enters) the upstream side of the conveyance while relatively rotating in the direction of conveyance to the discharge port 9b (clockwise as shown by the black arrow in FIG. 19).

  Thereby, the position where the second screw blade 52 moves relative to the first screw blade 42 in the case where the first and second screws 20 and 21 are rotationally driven and the case where the lateral auger 9 is expanded and contracted is the same approximate position. In the case where the horizontal auger 9 is extended and the horizontal auger 9 is shortened, the second screw blade 52 can be configured to move between the front and rear intermediate portions of the first screw blades 42 adjacent to each other. .

  Although the example in which the pair of power transmission members 90 are provided on the right side and the left side in FIG. 19 is shown, different numbers of power transmission members 90 sandwiching the second screw blade 52 may be employed. 19 may include two power transmission members 90 on the right side of FIG. 19 and one power transmission member 90 on the left side of FIG. 19, for example, one power transmission member 90 may be provided on the right side of FIG. 19 may be employed, and two power transmission members 90 may be employed on the left side of FIG. 19. Two power transmission members 90 may be provided on the right side of FIG. 19, and two power transmission members may be provided on the left side of FIG. 19. A configuration including 90 may be adopted. Moreover, you may employ | adopt the structure provided with the three or more power transmission members 90 in the paper surface right side and left side of FIG.

[Third Another Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention], [First Alternative Embodiment of the Invention], and [Second Alternative Embodiment of the Invention], the first screw 40 has a plurality of power transmission members. Although the example provided with 90 was shown, you may employ | adopt the structure provided with the single power transmission member 90 in the 1st screw 40, and the structure provided with the power transmission member 90 of a different quantity in the 1st screw 40 is employ | adopted. May be.

  In the above-mentioned [Best Mode for Carrying Out the Invention], [First Another Mode of Carrying Out the Invention], and [Second Another Mode of Carrying Out the Invention], a roller 92 or the like is employed as the power transmission member 90. However, a different structure may be adopted as the structure of the power transmission member 90 as long as it performs the same function. For example, a configuration in which a plate-like or rod-like steel material (for example, a round bar or a square member) is fixed to the first screw 40 side (for example, the drive shaft 41) may be employed.

  In the above-mentioned [Best Mode for Carrying Out the Invention], [First Alternative Embodiment of the Invention], and [Second Alternative Embodiment of the Invention], the power transmission member 90 is provided on the drive shaft 41. Although the example which showed the example was shown, the power transmission member 90 may be provided in the structural member from which the 1st screw 40 differs, for example, the structure provided with the power transmission member 90 in the 1st screw blade | wing 42 may be employ | adopted.

  In the above-mentioned [Best Mode for Carrying Out the Invention], [First Alternative Embodiment of the Invention], and [Second Alternative Embodiment of the Invention], the upstream end of the first screw 40 is conveyed. Although an example in which power for rotationally driving the first and second screws 40, 50 is input from the section has been shown, the first and second screws 40, 50 from the end of the second screw 50 on the downstream side of conveyance are shown. You may comprise so that the motive power which rotationally drives may be input.

[Fourth Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention], [First Alternative Embodiment of the Invention], [Second Alternative Embodiment of the Invention], and [Third Alternative Embodiment of the Invention] Although the horizontal auger 9 (grain discharge auger) provided with the second conveyance screw 21 in addition to the first conveyance screw 20 is shown as an example, the horizontal auger 9 may be configured by only the first conveyance screw 20. Moreover, although the example which comprised the 1st and 2nd screw 40,50 (one 1st conveying screw 20) and comprised the horizontal auger 9 was shown, the 1st and 2nd screw 40 of 2 or more sets was shown. , 50 (two or more first conveying screws 20), the horizontal auger 9 may be configured. For example, when two sets of the first and second screws 40 and 50 (two first conveying screws 20) are provided, the length for extending / contracting the horizontal auger 9 can be ensured twice as long, and the expansion / contraction stroke of 9 is horizontal lateral load. Can be secured twice as long.

  In the above-mentioned [Best Mode for Carrying Out the Invention], [First Alternative Embodiment of the Invention], [Second Alternative Embodiment of the Invention], and [Third Alternative Embodiment of the Invention] Although the example in which the first screw 40 is disposed on the upstream side of the conveyance and the second screw 50 is disposed on the downstream side of the conveyance is shown, the second screw 50 is disposed on the upstream side of the conveyance and the first screw 40 is conveyed. You may arrange | position in the downstream. In this case, it may be configured to input power for rotationally driving the first and second screws 40 and 50 from the end of the second screw 50 on the upstream side of conveyance, and the end of the first screw 40 on the downstream side of conveyance. You may comprise so that the motive power which rotationally drives the 1st and 2nd screws 40 and 50 may be input from a part.

  In the above-mentioned [Best Mode for Carrying Out the Invention], [First Alternative Embodiment of the Invention], [Second Alternative Embodiment of the Invention], and [Third Alternative Embodiment of the Invention] Although the example in which the extendable first transport screw 20 is disposed on the transport upstream side and the second transport screw 21 is disposed on the transport downstream side is shown, the extendable first transport screw 20 is disposed on the transport downstream side. And the second conveying screw 21 may be disposed on the upstream side of the conveyance.

[Fifth Embodiment of the Invention]
[Best Mode for Carrying Out the Invention], [First Alternative Embodiment of the Invention], [Second Alternative Embodiment of the Invention], [Third Alternative Embodiment of the Invention], and [Invention] In the fourth alternative embodiment, the example in which the first and second cases 23 and 24 are expanded and contracted by the expansion and contraction mechanism 70 with the drive shaft 41 stopped is shown. You may comprise so that the 1st and 2nd cases 23 and 24 may be expanded-contracted by the expansion-contraction mechanism 70, driving.

  [Best Mode for Carrying Out the Invention], [First Alternative Embodiment of the Invention], [Second Alternative Embodiment of the Invention], [Third Alternative Embodiment of the Invention], and [Invention] In the fourth embodiment of the embodiment, the example in which the expansion / contraction mechanism 70 is configured by using the slide rail 36, the expansion / contraction gear 76, etc. has been shown, but a different structure may be adopted as long as the same function is achieved. For example, you may comprise the expansion-contraction mechanism 70 using a feed screw (not shown) etc., for example.

[Sixth Embodiment of the Invention]
[Best Mode for Carrying Out the Invention], [First Alternative Embodiment of the Invention], [Second Alternative Embodiment of the Invention], [Third Alternative Embodiment of the Invention], [Invention of the Invention] In the fourth embodiment of the embodiment and the fifth embodiment of the invention, a self-decomposing combine is shown as an example of a combine. However, the present invention can be similarly applied to a different combine such as a normal combine. .

Combine right side view Overall plan view of combine Longitudinal section showing the overall structure of the horizontal auger 3 is a longitudinal sectional view at the position A in FIG. 3 in a state where the horizontal auger is extended. 3 is a longitudinal sectional view at the position B in FIG. 3 in a state where the horizontal auger is extended. 3 is a longitudinal sectional view at the position C in FIG. 3 in a state where the horizontal auger is extended. 3 is a longitudinal sectional view at the position D in FIG. 3 in a state where the horizontal auger is shortened. Longitudinal sectional view at position E in FIG. 3 with the horizontal auger shortened Longitudinal cross section near slide member Plan view near the telescopic mechanism Longitudinal side view near the telescopic mechanism Longitudinal section around the telescopic mechanism Perspective view near the anti-rotation mechanism Longitudinal side view for explaining the support structure of the second case Side view near the power transmission member Plan view near the power transmission member Longitudinal section around power transmission member Longitudinal sectional view of the vicinity of the power transmission member in the first alternative embodiment Longitudinal sectional view of the vicinity of a power transmission member in a second alternative embodiment of the invention

Explanation of symbols

9 Horizontal auger (grain discharge auger)
23 first case 24 second case 40 first screw 41 drive shaft 42 first screw blade 50 second screw 52 second screw blade 70 telescopic mechanism 90 power transmission member 92 roller

Claims (3)

A cylindrical first case; a cylindrical second case configured to be slidable with respect to the first case; and an expansion / contraction mechanism provided across the first case and the second case. In the first and second cases, first and second screws connected in series are provided, the winding direction of the first screw blade of the first screw and the second screw blade of the second screw. In the grain discharge auger of the combine that is set to the same winding direction as the winding direction, can convey the grain along the first and second cases, and is configured to be stretchable,
When the first screw blade is fixed to the drive shaft that rotates the first screw, the second screw blade is wound around the drive shaft, and the first and second cases are expanded and contracted by the expansion mechanism. The second screw blade moves while relatively rotating between the first screw blades adjacent to each other, and the second screw moves toward the first screw while overlapping the first screw. With
When the first screw is provided with a power transmission member and one of the first or second screw is rotationally driven in the direction of conveying the grain, the rotational driving force from one of the first or second screw is the first screw. A combine grain discharge auger configured to be transmitted to the other of the first or second screw via a two-screw blade and a power transmission member.   The combine grain discharge auger according to claim 1, wherein the power transmission member is provided at a plurality of locations in the conveying direction of the first screw.   The combine grain discharge auger according to claim 1 or 2, comprising a roller supported on the drive shaft so as to be rotatable about a radial axis, and constituting the power transmission member.

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