JPH10136753A - Tention mechanism of lower part carrier chain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold the tention of a chain while properly keeping force for grasping a grain stem in the chain in the cutting part of a combine provided with a lower part carrier chain for carrying the plant foot of the cut grain stem. SOLUTION: A driving sprocket 65L of the lower part carrier chain 60L and a tention roller 66 are supported at the adjacent position of a grain stem carrier path R rear part which carries the plant foot of the cut grain stem, the lower part carrier chain 60L between the driving sprocket 65L and the tention roller 66 is arranged in parallel with the grain stem carrier path R and also the tention roller 66 is constituted to operate in tension in almost parallel with the grain stem carrier path R.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for tensioning a lower transport chain in a combine harvester.

[0002]

2. Description of the Related Art Conventionally, a harvesting section of a combine provided with a lower transport chain for transporting a root of a harvested grain culm is provided with a tension roller for maintaining the tension of the chain at a substantially constant level.

[0003]

However, when the tension roller moves to perform the tension operation,
The distance between the guide rod provided opposite to the chain changes, and the gripping force on the cereal stem changes.When the gripping force is weak, the cereal stem being transported falls off, and when it is strong, the frictional resistance increases. Therefore, there is a problem that power loss is increased and the chain is worn out.

[0004]

Therefore, according to the present invention, in a cutting section of a combine provided with a lower transport chain for transporting a root of a harvested grain culm, a drive sprocket and a tension roller of the lower transport chain are connected to a harvesting grain. The lower conveying chain between the driving sprocket and the tension roller is disposed substantially parallel to the grain culm conveying path, and is supported at a position near the rear of the grain culm conveying path that conveys the stem of the culm. Is provided so as to operate the tension substantially parallel to the grain culm conveying path.

[0005] The present invention also has the following features.

The tension roller is pivotally supported at the tip of the tension arm, and a pivot is disposed near a vertical line lowered from the axis of the tension roller to the grain culm conveying path. The end is pivotally supported.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a tension roller of a lower transport chain is pivotally supported on a tip end of a tension arm.
The tension roller is transported to the culm by urging the tension roller outward with a spring by positioning the base end of the tension arm on an extension of the perpendicular that is lowered from the axis of the tension roller to the culm transport path. By moving the tension roller outward with a spring, the distance between the lower transport chain and the guide rod provided opposite to the lower transport chain is substantially constant regardless of the movement of the tension roller. Can be held. Therefore, it is possible to apply a substantially constant tension to the lower transport chain while maintaining the grip force acting on the grain stem substantially constant.

[0008]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a combine A for three-row cutting provided with a tension mechanism for a lower transport chain according to the present invention. In FIG. 1, reference numeral 1 denotes a track frame provided with a pair of right and left crawler type traveling devices 2; Reference numeral 3 denotes a machine frame mounted on the truck frame 1; 4 denotes a threshing unit in which a feed chain 5 is stretched to the left and a handling cylinder 6 and a processing cylinder 7 are built in; 8 is a mowing equipped with a cutting blade grain culm transport mechanism and the like. And 9, a straw processing unit having a straw chain 10 and a straw cutter 11, a driving unit 12 having a driver's seat 13 and a driving operation unit 14, a motor unit 15 with a built-in engine 16, and 17 a grain. A grain tank, 18 is a fryer cylinder, and 19 is a rocking and sorting section provided with a blower 20. The traveling stalk is operated by the operation operation section 14 to move the culm cut by the cutting section 8 to a threshing section. Threshing is performed at 4 and the straw is discharged through the straw chain 10 and the straw cutter 11 of the straw processing section 9. The thresh is separated into kernels and fine dust in the rocking sorter 19, and the kernels
The dust is stored in the grain tank 17 through 18 and the fine dust is discharged to the outside through the blower 20.

[0010] As shown in Figs.
At the rear end of the lower frame 30, which is formed in a substantially rectangular frame shape, left and right drive shaft cases 31L, 31R, which also serve as left and right vertical frames, are erected from front to back and low to form a mowing section frame 32.

At the front end of the lower frame 30, four lower support rods 33 are protruded forward while maintaining a predetermined interval, and a weeding body 34 is attached to each of the lower support rods 33 at the tip thereof. The planted grain culm introduction path 35 is formed.

On the upper surface of each lower supporting rod 33 behind the weeding body 34, a raising part supporting rod 36 is erected, and an upper end of each raising part supporting rod 36 and an upper end of the left and right drive shaft cases 31L, 31R. A raised portion 39 provided with a raised belt 38 having a plurality of raised tines 37 projecting therefrom is erected at an angle from the front to the lower and rear, and raised by the rotation of the raised belt 38. The culm that fell on the tine 37 is raised and raised.

A cutting blade device 40 is arranged on the lower surface of the rear end of the lower support rod 33 so as to cut the root of the planted grain culm that has moved backward through the planted grain culm introduction path 35. ing.

Behind the raising section 39, lower left and right transport chains 60L and 60R for transporting the grain stalks cut by the cutting blade device 40 to the succeeding feed chain 5 are provided.

The lower left transport chain 60L is configured as follows. That is, a left vertical frame 61L is erected on the upper surface on the left side of the lower frame 30, and a left rotating body support rod bent in a substantially L shape between a middle portion of the left vertical frame 61L and the left lower support rod 33. 62L, and the rotating body support rod 62L on the left side
A rotating body 63 is supported in a suspended state in the middle of the
A left front sprocket 64L is formed at the lower part of the outer periphery of 63, and a lower left conveying chain 60L is wound between the left front sprocket 64L, the left driving sprocket 65L, and the tension roller 66, and the left lower conveying chain 60L is rotated clockwise. Thus, the harvested culm is transported diagonally to the upper right.

The lower right transport chain 60R is configured as follows. That is, the pipe frame 67 is disposed obliquely to the upper left and lower left from the lower right front side inside the reaper 8, and the front end of the pipe frame 67 is supported by the upper portion of the lower support rod 33 on the right side.
The left drive shaft case 31R
We support in the middle.

The pipe frame 67 has a front part 67F in side view.
The upper part and the rear part 67R are bent in a stepped manner with the lower part, and in plan view, the front part is bent outward with the rear part inside, and the right front sprocket 64R is mounted on the outer periphery of the front part 67F of the pipe frame 67. The right rotating body 63 formed is supported in a suspended state, and the right front sprocket 64R, the rear sprocket 68 supported on the rear end of the pipe frame 67, the right driving sprocket 69, and the right Lower transport chain 60
R, and by rotating the lower right transfer chain 60R to the left,
The harvested culm is transported diagonally to the left and back.

A rotating body 63 is also provided behind the central culm introduction path 35, and the harvested grain culm is transferred toward the lower right transport chain 60R by rotating the central rotating body 63 clockwise. Like that.

Therefore, the harvested culm of the right and central strips merges at a position closer to the front in the middle of the lower right transport chain 60R,
The cut culm of the left strip is joined at the rear end of the lower right transport chain 60R and delivered to the subsequent feed chain 5.

In the lower right transport chain 60R, according to the present invention, the rear portion 67R of the pipe frame 67 is disposed close to and parallel to the inside of the lower right transport chain 60R.
A lower transport chain guide 72 extending from the rear end of the lower right transport chain 60R to the junction 71 with the central strip on the outer peripheral surface of 67R.
Is fixed by means such as welding, and the outer surface of the lower transport chain guide 72 is slid in contact with the inner surface of the lower right transport chain 60R,
The right-hand line and the central line merge to ensure that the harvested culm whose transport amount has increased is held.

As described above, by directly fixing the lower transport chain guide 72 to a part of the pipe frame 67, a member for supporting the lower transport chain guide 72 is not required, and the number of parts is reduced. The weight can be reduced.

Further, a rear rake belt pulley 73 is formed at the upper part of the outer periphery of each of the rotating bodies 63, and between each rake belt pulley 73 and a front rake belt pulley 74 which is supported diagonally forward.
A rake belt 76 having a number of rake tines protruding around the outer circumference is wound, and a star wheel 77 is formed on the outer circumference of the lower end of each rotating body 63. Therefore, the right scraping belt 76
And the star wheel 77 are supported by the pipe frame 67 via the respective rotating bodies 63.

In the figure, reference numerals 78L and 78R denote left and right tension mechanisms, which include left and right tension arms 79 and 80, a tension spring 81, and an adjusting screw 82, respectively.
In particular, the left tension mechanism 78L is provided between the left driving sprocket 65L and the tension roller 66 in the lower left transport chain.
60L is arranged substantially parallel to the left end of the lower right transport chain 60R to form a cereal culm transport path R, and the left vertical frame
An arm support 83 is fixed to the outer peripheral surface of the 61L, and the base end of a left tension arm 79 is pivotally connected to a pivot 84 provided on the arm support 83 so as to be freely rotatable. Is set to a position close to the perpendicular 86 drawn down to the virtual extension line 85 at the left end of the lower right transfer chain 60R, and the left tension arm
The rotation locus of the tension roller 66 pivotally supported at the tip of 79 is
When the lower left transfer chain 60L is normally mounted, the lower left transfer chain 60L is substantially parallel to the virtual extension line 85. Therefore, even if the tension roller 66 moves for the tension operation,
The lower left transfer chain 60L between the left driving sprocket 65L and the tension roller 66 and the lower right transfer chain 60R opposed to this portion will be maintained in a substantially parallel state.
The distance between the left and right lower transport chains 60L, 60R is kept substantially constant, and the harvested grain culm can be reliably clamped.

The left tension mechanism 78L has a restricting body 88 having a locking portion 87 formed by bending the distal end portion into a substantially L-shape.
The contact between the locking portion 87 and the left tension arm 79 restricts the operation of the tension roller 66 on the loose side, and when an abnormality occurs in the tension spring 81 or the adjusting screw 82, the lower left portion is This prevents the transport chain 60L from becoming too loose.

In the figure, reference numeral 89 denotes a lower left transport chain guide;
Is a left tensioner, 91 is a center-raising drive shaft case, 92 is an ear tine, 93 is a chain case, 94 is an upper conveying device, and 95 is a winding prevention cylinder.

[0026]

According to the present invention, the following effects can be obtained.

According to the first aspect of the present invention, in a cutting section of a combine provided with a lower transport chain for transporting the root of the harvested grain culm, the driving sprocket and the tension roller of the lower transport chain are connected to the root of the harvested grain culm. And a lower transport chain between the driving sprocket and the tension roller is disposed substantially parallel to the grain culm transport path, and the tension roller is mounted on the grain culm. By configuring the tension operation to be substantially parallel to the conveyance path, even if the tension roller moves for the tension operation, the change in the interval between the lower conveyance chain and the guide rod provided opposite thereto is suppressed. The gripping force of the harvested grain culm does not change, preventing dropping of the grain culm due to loose gripping force, loss of power due to excessive gripping force, and wear of the lower transport chain. Kill.

According to the second aspect of the present invention, the tension roller is supported at the tip of the tension arm, and
A pivot is arranged in proximity to a vertical line lowered from the axis of the tension roller to the grain culm conveying path, and the base end of the tension arm is pivotally supported on the pivot to allow the tension roller to rotate. It is possible to simplify the structure for moving the transport path substantially in parallel with the transport path.

[Brief description of the drawings]

FIG. 1 is a side view of a combine provided with a tension mechanism according to the present invention.

FIG. 2 is a partially cutaway side view of a cutting unit.

FIG. 3 is a partially cutaway plan view of a cutting unit.

[Explanation of symbols]

 A Combine R Grain culm conveying path 8 Cutting section 60L Lower conveying chain 65L Drive sprocket 66 Tension roller 78L Tension mechanism 79 Tension arm 86 Vertical line

Claims (2)

[Claims] A cutting sprocket (65L) of a lower transport chain (60L) and a tension roller in a harvester (8) of a combine (A) equipped with a lower transport chain (60L) for transporting a root of a harvested grain culm. (66) is pivotally supported at a position near the rear of the grain culm transport path (R) for transporting the root of the harvested grain culm, and the lower transport between the drive sprocket (65L) and the tension roller (66) is supported. The chain (60L) is arranged substantially parallel to the grain culm transport path (R), and the tension roller (66) is
A tension mechanism for the lower transport chain, which is configured to operate the tension substantially parallel to (R). The tension roller (66) is pivotally supported at the tip of a tension arm (79), and a perpendicular (8) lowered from the axis of the tension roller (66) to the grain culm transport path (R).
2. A lower conveying device according to claim 1, wherein a pivot (84) is arranged close to the pivot (6), and the base end of the tension arm (79) is pivotably supported on the pivot (84). Chain tension mechanism.