JP2010068771A - Sugarcane harvester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base cutter and a chopping device capable of smoothly and surely introducing sugarcane cut with the base cutter into a drawing port of the chopping device. <P>SOLUTION: The base cutter 1 has a portal casing 5, an upper horizontal part of the portal casing 5 is a transmission case, right and left legs of the casing are vertical shaft cases 5b, a spiral butt lifter 11a is fixed to an upper circumference of a rotary disk placed at a lower end of a vertical shaft in the vertical shaft case 5b, a lower end of the butt lifter 11a is directed forward and an upper end is directed backward in a rotational direction, a lifting level with the butt lifter 11a is nearly the same as a lower rotary shaft of a pair of upper and lower chopping blades of the chopping device, a lower face of the upper horizontal part of the portal casing 5 of the base cutter 1 is positioned at or below the height of the upper rotary shaft of the upper and lower chopping blades of the chopping device, and each of the upper and lower chopping blades of the chopping device has three rotary blades. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sugar cane harvesting machine, and more particularly to an apparatus for harvesting and chopping sugar cane. The harvesting operation can be carried out very smoothly and efficiently, and a sugar cane harvesting operation for large varieties (thick and long varieties). Can also demonstrate high work ability.

  Sugar cane cultivation in Japan is extremely intensive compared to other countries, and like other agricultural crops, straw cultivation (cultivation method for cultivation in straw) is carried out, most of which are medium varieties, but in the future ethanol It seems that the cultivation of large varieties (thick and long varieties) suitable for production will flourish. And when cutting sugar cane P with the cutting blades 16 (see FIG. 1) of the pair of left and right base cutters 1 at the base, cutting at the part that is on the ground will break the stump B (the remaining strain). If the stump B is broken, it is invaded by pathogenic bacteria, and the stocking (new sprouting) worsens, and the growth after germination also worsens. And it is desirable to avoid as much as possible the occurrence of stock cracking by root cutting with the base cutter 1, so the cutting blade 16 of the base cutter 1 is put into the soil at the top of the ridge A, and the cut line L of a predetermined depth is formed. A root cutting method is used in which the roots of sugar cane P are cut in the soil (see FIG. 3).

  The rotating disk 15 of the base cutter 1 is tilted slightly forward, the cutting blade 16 is fixed to the outer periphery thereof, and the left and right base cutters 1 move forward while rotating inward. Therefore, the sugar cane P is cut in the soil by the base cutter 1 and is scraped and drawn by a scraping roller (by a pair of upper and lower rotating rollers) immediately behind the base cutter 1 and then obliquely upward by the transport roller. And is fed into a chopping device (chopper) 2 disposed at the rear end of the transport roller, and is chopped into a predetermined length (for example, about 25 cm) by the chopping device 2. The shredded sugar cane (hereinafter referred to as “sugar cane fine piece”) Pa is dropped on the wind separator while the trash (dead leaves etc.) is separated by wind pressure, and only the sugar cane fine piece Pa is accommodated in a bag or the like.

[Prior art 1]
The basic form of a conventional sugar cane harvesting machine is as shown in FIG. 5, and there is a raising device (crop divider) 50 at the tip, and a base cutter 51, a raking roller 52, a conveying roller 53, and a chopping device 54 are arranged in order from the front. It is arranged, unraveled while being caused by the sugar cane and being caused by the device 50, drawn into it, and cut by the base cutter 51. The root of the cut sugar cane (the rear end in the state of being cut and pushed down by the base cutter) is flipped up by the butt lifter 51a (provided on the upper surface of the rotating disk of the base cutter 51), and the scraping roller behind it 52, is pulled and fed to the transport roller 53 behind it, and then is transported to the rear upper chopping device (chopping device) 54 by the transport roller 53 to be chopped (Japanese Unexamined Patent Application Publication No. 2004). -337036).
In the above prior art 1, when the sugar cane P stands relatively straight, the harvesting operation is performed relatively smoothly. However, when the sugar cane P falls down and is intertwined, the sugar cane P is smoothly drawn into the scooping roller 52. As a result, the entrance of the raking roller 52 is clogged, and as a result, the harvesting operation is sometimes stopped.

  If the sugar cane is a large variety (thick and long variety), the amount of scraping by the scraping roller 52 increases, and each sugar cane is strong and has a high resistance to scratching. As a result, the scraping ability decreases, and as a result, a large amount of sugar cane is clogged at the entrance (scratching opening) of the scraping roller 52. In this way, when the sugar cane is clogged at the entrance of the raking roller 52 and the harvesting operation is frequently interrupted, the work efficiency is greatly reduced.

It should be noted that the cutting blade 16 and mounting bolts do not collide with the cut stump B (refer to the stump B in FIG. 3) to damage the stump B, and the rotation with respect to the base cutter becomes an obstacle. The rotating disk 15 of the base cutter 1 is tilted forward so that the resistance does not increase (prior art 1).
In the prior art 1, the position is raised so that the scraping roller 52 immediately after the base cutter does not thrust into the heel A so that its bottom is slightly higher than the heel A. The base of the sugar cane P is jumped up by the butt lifter 51a on the rotating disk of the base cutter.

[Prior art 2]
Another conventional technique has the following configuration (FIG. 6). This is because a chopping device 62 with a pair of upper and lower chopping blades is disposed immediately behind the base cutter 61, and the upper and lower chopping blades of the chopping device 62 immediately behind the base of the sugar cane P cut by the base cutter. Grabbed by 62a, 62b, chopped backward with the chopping blade, and chopped (sugar cane fine pieces) discharged to the tip of the conveyor 63 below, and obliquely upward by the conveyor 63 And then dropped onto the wind-selecting device at the rear end.
In addition, although the patent document in which the said prior art 2 is described cannot be discovered, it is a fact that it is publicly used in Southeast Asia etc. Since it is not an intensively cultivated area like Japan, but a relatively loosely cultivated area, the rotating blade of the base cutter rotates within a horizontal plane several cm above the ground. It is a structure to do.

By the way, in the said prior art 2, since the sugar cane P cut | disconnected from the base with the base cutter 61 slips through the clearance below the chopping apparatus 62, it will not be harvested but will be left behind. The lower end of the chopping device needs to be lowered below the rotating disk 61a of the base cutter 61, but this is not possible because the bottom of the chopping device 62 must not be pushed into the ground (the rotation in FIG. 6). (See the vertical positional relationship between the disk 61a and the chopping device 62).
Moreover, since the rotating disk 61a of the base cutter is horizontal and is not premised on vine cultivation, and the root of the sugarcane mower is different in the prior art 2, the base as a sugar cane mower is different. Compared to that of the prior art 1, the overall mechanism from rooting to storage is very simple, and the sugar cane P that has been trimmed is cut by the upper and lower cutting blades of the chopping device immediately behind it. Because it is grabbed and pulled strongly, the sugar cane's backward flow is much faster and stronger than that of prior art 1 with a scraping roller. Therefore, even if the sugar cane P cut by the base cutter 61 is a large variety, its scraping and shredding processing capability is high.

  Considering the above, based on the conventional technology 2, while taking advantage of this conventional technology 2, while aiming to be able to efficiently harvest large varieties cultivated in Japan, A sugar cane harvesting machine has been developed that is designed to tilt the rotating disk forward (however, this is also not known, hereinafter referred to as “prior art”). There are important issues that must be done. This problem will be described with reference to FIG.

  Since the sugar cane P is cut with the base cutter 1 in the soil of the reed, foreign matter w such as dirt, dust, and pebbles is bounced obliquely upward and rearward by the rotating disk 15 and the cutting blade and its mounting bolts (FIG. 4). Reference), it is drawn into the chopping device, falls onto the transport belt that transports the fine pieces Pa, and is mixed into the harvest. One reason for this is that the rotating disk 15 of the base cutter rotates in a forward tilting posture.

  In the above prior art, since the chopping device 2 is located immediately behind the forwardly inclined base cutter, the foreign matter w such as pebbles jumped off by the base cutter is easily drawn into the chopping device 2, and the foreign matter w such as pebbles is When pulled into the chopping device 2, the chopping blade bites it and is damaged. This is a problem due to the chopping device being lowered to a height that can surely retract the base of the sugar cane P (those cut and cut) cut by the base cutter (see FIG. 4).

There are also the following problems.
In order for sugar cane cut by the base cutter 1 to be drawn into the chopping device 2, the roots must be scooped up from below with a chopping blade. If the base of the cut sugar cane enters the lower side of the chopping blade, it will not be drawn into the chopping device 2 and will be missed.
And when the position of the base cutter 1 is low in order to cut the sugar cane P in the soil, the position of the chopping device must be further lowered accordingly, otherwise the above problem will occur. It becomes even more prominent.

On the other hand, in the prior art 2 in which sugar cane is cut while being scraped with the chopping blade of the chopping device, there is an idling section (θ2 in FIG. 1-1) where the chopping operation is not performed during one rotation of the chopping blade. Therefore, the speed of sugar cane pulsation. When the pulsation of the scraping speed is significant, the scraping ability of the chopping device is greatly reduced.
In order to complete and disseminate a sugar cane harvesting machine suitable for Japanese sugar cane cultivation method and excellent in workability based on the above-mentioned conventional technique 2, the above problems must be solved.
JP 2004-337036 A

This invention has a chopping device immediately behind the base cutter, and the sugar cane cut by the base cutter is scraped by the chopping blade of the chopping device, gripped by this, and then chopped while being fed backward. And about the sugar cane harvesting machine that is designed to convey the shredded sugar cane pieces diagonally upward and backward on the conveyor,
The purpose is to eliminate the problem of scratching by the chopping device of the root-cut sugar cane, so that the sugar cane cut by the base cutter is smoothly and reliably introduced into the inlet of the chopping device at a high position, The technical problem is to devise the base cutter and the chopping device so that the sugar cane introduced into the drawing port is drawn as smoothly as possible with the chopping blade of the chopping device.

Means for solving the above-mentioned problem is that there is a chopping device with a pair of upper and lower chopping blades immediately behind the forwardly inclined base cutter, and the chopping device chops sugar cane cut (root-cut) by the base cutter. With regard to the sugar cane harvesting machine that pulls in with the blade, chops it while feeding it backwards, and conveys the chopped sugar cane diagonally upwards toward the back with a conveyor, the following (a) to (f) It is.
(A) The base cutter has a portal casing, the upper horizontal portion of the portal casing is a transmission case, and the left and right legs are vertical axis cases,
(B) A spiral butt lifter is fixed to the outer periphery of the upper surface of the rotating disk provided at the lower end of the vertical axis in the vertical axis case,
(C) The lower end of the butt lifter is forward in the rotational direction, and the upper end is backward in the rotational direction.
(D) The pushing-up height position by the butt lifter is substantially the same height position as the lower rotation shaft of the pair of upper and lower shredded blades of the chopping device
(E) the lower surface of the upper horizontal portion of the base-shaped casing of the base cutter is at a position below the height of the upper rotary shaft of the pair of upper and lower shredded blades of the chopping device;
(F) The upper and lower chopping blades of the chopping device are each provided with three rotary blades.

[Action]
The left and right cutting blades of the base cutter tilted forward rotate inward to cut the sugar cane in the soil. At this time, since the spiral bat lifter provided on the upper surface of the rotating disk is also rotated inward, the lower end collides with the butt lifter at the moment when the sugar cane is cut by the base cutter and is pushed up greatly by this ( Or you can jump up). Therefore, even if the drawing-in port m (see FIG. 1-1) of the chopping device is raised, the position of the chopping device with respect to the base cutter can be raised without the problem of entering the lower side of the chopping device.
In other words, the base of the sugar cane is pushed up above the lower rotating shaft of the shredded blade by the butt lifter, so that it can be surely scooped up by the lower shredded blade, so it will sink under the lower shredded blade. Is prevented.

  On the other hand, the base of the sugar cane is strongly bounced up by a butt lifter whose inclination angle is larger than that of the prior art 1 and is surely pushed up to a sufficient height, but when it is bounced up above the upper rotating shaft of the chopping device, It hits the upper horizontal part of the casing of the chopping device or slips over it. However, the upper limit of the height of the sugar cane root is limited by the upper horizontal part 5a of the gate-type casing 5, and similarly, the right and left jumping is limited by the left and right leg parts 5b and 5b. 5a and left and right vertical shaft cases 5b and 5b are smoothly and reliably guided toward the drawing port m of the chopping device while being pressed from above and from the left and right (see FIG. 1-1).

On the other hand, the upper and lower chopping blades of the chopping device are each provided with three rotary blades 24, and the chopping is repeated three times in one rotation. A shredding is performed once at a rotation angle of 120 degrees, and a drawing operation is performed within a rotation range of a rotation angle θ1 (for example, about 60 degrees).
Then, it is pulled in by the rotation angle θ1 (about 60 degrees) described above, and after the idling operation (idle feed) by the rotation of the remaining rotation angle θ2 (the remaining about 60 degrees), the next rotary blade 24 pulls in. The

As described above, the retraction operation by the chopping blades 21a and 21b is performed by repeating the retraction of sugar cane by the rotation angle θ1 (about 60 degrees) and the empty operation for the rotation angle θ2 (remaining about 60 degrees). Although sugar cane is continuously fed backwards by the advancement of the implement.
That is, sugar cane fed backward at a speed equal to the running speed is drawn with a relatively long drawing stroke three times per rotation of the chopping blade. The interval of the idle operation between the repetitive pulling operations is about 120 degrees in 180 degrees when there are two rotary blades, and about 60 degrees in 120 degrees when there are three rotary blades. That is, it is about 1/2 of the two cases, and therefore, the pulsation of the chopping blade is much smoother and more efficient than the two cases.

The sugar cane cut by the base cutter is bounced up by a spiral butt lifter on the base cutter's rotating disk, and is held down from the left and right and above by the base cutter casesing of the base cutter, toward the inlet m of the chopping device. Guided smoothly and reliably.
The sugar cane is intermittently driven in the pulling direction by the three rotary blades of the chopping device, but the sugar cane is continuously fed backward by the traveling of the harvester. The continuous feed by the traveling of the harvesting machine is overlapped with the intermittent feed by the three rotary blades, whereby the sugar cane is drawn into the chopping device almost continuously without being shredded.

If the pulsation of the pull-in speed is large, the pull-in ability is low, and if the pulsation is small and smooth, the pull-in ability is higher.
Since the base of the sugar cane is smoothly and reliably guided toward the inlet m of the chopping device by the base-shaped casing of the base cutter and the butt lifter of the base cutter, the sugar cane is reliably drawn into the chopping device.
Therefore, the sugar cane harvesting machine according to the present invention has a very simple overall mechanism as compared with that of the prior art 1, is small and light, and has a high work capacity. There is little missing, and there is little foreign matter such as pebbles and soil in the harvest, and the work ability is high.

Next, embodiments will be described with reference to the drawings.
The sugar cane harvesting machine of this embodiment has a trigger device (same as the trigger device 50 in FIG. 5) at its tip, a base cutter 1 behind it, a chopping device 2 immediately behind the base cutter 1, and a rear There is a chain conveyor 3, and there is a wind selection device (same as the wind selection device 55 in FIG. 5) behind the chain conveyor.
The overall mechanism is similar to the prior art 1 shown in FIG. 5, but differs in the following three points (a), (b), and (c).
(A) There is a chopping device 2 immediately behind the base cutter 1 equipped with a butt lifter, and there is a chain conveyor behind the chopping device 2.
(B) The base-type casing of the base cutter is located in front of the chopping device with a pair of upper and lower chopping blades in front of it,
(C) The number of rotating blades of each chopping blade of the chopping device is three.

Further, it differs from the prior art 2 in the following four points (a) to (d).
(A) The base cutter 1 disposed immediately in front of the chopping device 2 includes a gate-type casing 5, and the height of the lower surface of the upper horizontal portion of the gate-type casing 5 is that of the upper chopping blade of the chopping device. The point below the rotating shaft 23a,
(B) There are spiral butt lifters 11a and 11b on the rotating disk 15 of the base cutter 1 immediately in front of the chopping device 2.
(C) The height position of the upper ends of the butt lifters 11a and 11b is substantially the same height position as the rotary shaft 23b of the lower chopping blade of the chopping device 2,
(D) The upper and lower chopping blades of the chopping device each include three rotating blades.

The base cutter 1 includes a portal casing 5, and the vertical axis in the vertical axis case 5 b is driven by the gear box 10 of the upper horizontal portion 5 a, and the rotary disk 15 is driven by the vertical axis. The gear box 10 is driven by the oil motor m1, and the left and right rotating disks 15, 15 rotate inward in synchronization with each other in a forward tilted posture.
In this embodiment, four cutting blades 16 are fixed at equal intervals on the outer periphery of a rotating disk 15 having a diameter of 40 cm, and the peripheral speed of the cutting blades 16 is 7 to 8 m / sec. The vertical axis is tilted forward at an angle θ (FIG. 2), and the rotary disk 15 is also tilted forward at the same angle. The forward tilt angle θ in this embodiment is 15 to 20 degrees.

  Then, on the upper surface of the rotating disk 15, there are spiral butt lifters 11a and 11b. The butt lifters 11a and 11b are gentle spiral members having a diameter of 42 cm and a pitch of 50 cm. The lower ends thereof are welded to the outer peripheral portion of the rotating disk 15, and the height of the upper ends is 25 cm from the upper surface of the disk. is there. Two such butt lifters 11a and 11b cover the entire circumference of the rotating disk 15 in pairs. The butt lifters 11a and 11b are made by bending a steel material having a wire diameter of 25 mm and quenching to improve wear resistance.

The chopping device 2 is composed of a pair of upper and lower chopping blades 21a and 21b, and the inter-axis distance L1 between the rotation shafts 23a and 23b is 25 cm. The rotating shafts of the chopping blades 21a and 21b are interlocked with a gear box 22, and the gear box 22 is driven by an oil motor m2 (FIG. 1), and the chopping blades 21a and 21b face each other inwardly. Are rotating at the same speed. The height H with respect to the cutting line L by the base cutter 1 of the rotating shaft 23b of the lower cutting blade 21b of the chopping device 2 is 30 cm (FIG. 2).
Each of the chopping blades 21a and 21b has three rotary blades 24, and the rotary radius of the rotary blades 24 is 13 cm. The central angle between the chopping blades 21a and 21b is 120 degrees.

By the way, in this embodiment, the sugar cane P is drawn at a predetermined speed and is shredded at a predetermined length (about 25 cm). Therefore, the smaller the number of blades, the shorter the inter-axis distance L1, and the shredded blade. The number of shredding in one rotation is small, the vertical width of the inlet for sugar cane is narrow, the larger the number of blades, the larger the radius of rotation, and the number of shredding of sugar cane in one rotation of the shredded blade is large .
If there are three rotary blades 24, the distance L1 between the shafts is larger than in the case of two, and the inlet for sugar cane becomes wider by the amount of the distance between the shafts, and the scavenging performance is improved. When there are four rotary blades 24, the inter-axis distance L1 is further increased, and as a result, the chopping device is further increased in size.

  Further, the central angle between the three rotary blades 24, 24 is 120 degrees, and the pulling action is exhibited in the latter half (rotation angle θ1: about 60 degrees in FIG. 1-1). In the first half (rotation angle θ2: about 60 degrees), it hardly interferes with the sugar cane, but the sugar cane is sent backward (pressed) to the base cutter 1 and the chopping device 2 by the forward traveling of the harvester, While the chopping blade makes one rotation, the rotating blade 24 is intermittently and repeatedly pulled three times. And when there are two rotary blades, the pulling action in one rotation is twice, so that the pulling speed is less pulsated and the sugar can be drawn smoothly. On the other hand, when there are four or more rotary blades, there is a section in which the two rotary blades 24 simultaneously act on the sugar cane, and in this section, the actions of the two rotary blades interfere with each other (interference due to the difference in speed component in the front-rear direction). Thus, this may cause a periodic increase in rotational resistance with respect to the chopping blade, but this is not the case with three rotating blades. Therefore, the drawing by the chopping blades 21a and 21b is smooth, the drawing force is strong, and the processing capacity of the chopping device is high.

  The center distance L1 between the rotation center of the rotating disk 15 of the base cutter 1 and the rotating shafts 23a, 23b of the chopping blades 21a, 21b of the chopping device 2 is 40 cm, and this center distance is 40 cm at the standard traveling speed. The base cutter 1 rotates several times (four rotations in this embodiment) during self-running. At the moment of cutting with the cutting blade 16 of the base cutter 1, the base of the sugar cane is reliably pushed up by the lift amount (25 cm) by the spiral butt lifters 11 a and 11 b, and the pushed up sugar cane is horizontally above the portal casing 5. It is pressed by the part 5a and the left and right leg parts 5b, guided toward the drawing port m of the chopping device 2, is gripped and drawn by the upper and lower chopping blades 21a and 21b, and is narrowed to a predetermined length (about 25 cm). Refused.

  Since the butt lifters 11a and 11b are spiral wires, they do not jump up the foreign matter w such as soil and pebbles, and push up only the base of the sugar cane P. Moreover, since the rotary blade 24 bites into the sugar cane P when pulled into the chopping device, it can be pulled in strongly without slipping against the sugar cane P.

In this embodiment, when this travels at a standard speed (0.5 m / sec), the rotation speed of the base cutter 1 is 300 rpm, and the rotation peripheral speed of the cutting blade 16 at this time is 7.8 m / sec. The lift speed of 11a and 11b (speed pushed up in the vertical direction) is 2.5 m / sec. And since the traveling speed during work, the rotational speed of the base cutter, and the rotational speed of the chopping device are all adjusted by the engine rotational speed, the traveling speed during the harvesting work, the rotational speed of the rotating disk 15 of the base cutter, The relationship with the rotational speed of the chopping blades 21a and 21b of the chopping device does not change.
Therefore, regardless of whether the traveling speed is increased or decreased, all the sugar cane cut by the base cutter is surely drawn into the chopping device 2 and chopped to a predetermined length (about 25 cm in this embodiment).

  Various conveyors can be adopted as the conveyor of the present invention. However, in this embodiment, the chain of sugar cane fine pieces Pa chopped to about 25 cm must be smoothly conveyed. A conveyor is used. This chain conveyor is composed of a steel plate 30 having a plate thickness of 2.3 to 3.0 mm and a chain 31 that slides on the steel plate 30, and blades 32 are fixed to the chain 31. Slide the upper surface of 30 and push up a large amount of shredded sugar cane pieces Pa upward. This is because the shredded sugar cane Pa is transported, and therefore, it is simpler and has a higher transport capacity than when a long sugar cane P is transported by a transport roller (conveying conveyor in the prior art 1).

  In addition, since this conveyor receives the sugar cane thin piece Pa shredded by the chopping device and conveys it to the rear wind selection device, the length and the inclination angle thereof are the rear wind selection device (not shown). Is appropriately selected according to the position (height direction, front-rear direction). Moreover, since the magnitude | size of the inclination angle of a conveyor influences the conveyance performance with respect to the sugar cane thin piece Pa shredded, this point must also be considered.

The chopping device has three chopping blades, its operation is smooth and its processing capacity is high, and a large amount of sugar cane is drawn into the chopping device smoothly and reliably by the butt lifter and the portal casing. Even if the traveling speed is increased, the shredding process is performed more smoothly than that of the prior art 1, and the ability of harvesting work is significantly higher than that of the prior art 1 equipped with the same horsepower engine.
Therefore, the harvesting operation is very efficiently performed as compared with the conventional technique 1.

The perspective view which shows the principal part of the Example of this invention Is a reference diagram for explaining the operation of the present invention. The side view of the principal part of the Example of this invention Is a schematic diagram for explaining the background art Is a schematic diagram for explaining the prior art FIG. 3 is a side view showing an overall image of prior art 1; The schematic diagram for demonstrating the prior art 2

Explanation of symbols

1: Base cutter 2: Chopping device 3: Chain conveyor 5: Portal casing 5a: Upper horizontal part 5b: Vertical case 10, 22: Gear box 11a, 11b: Butt lifter 15: Rotary disk 16: Cutting blades 21a, 21b : Shredder blades 23a, 23b: Rotating shaft 24: Rotating blade 30: Steel plate 31: Chain 32: Blade 50: Raising device (crop divider)
51: Base cutter 51a: Butt lifter 52: Scraping roller 53: Conveying roller 54: Chopping device 55: Wind sorting device A: 畝 B: Stump L: Cutting line w: Foreign matter m such as pebbles m: Inlet m1, m2: Oil motor P: Sugar cane Pa: Sugar cane fine fragment

Claims (1)

There is a chopping device with a pair of upper and lower chopping blades immediately behind the forward tilted base cutter, and the sugar cane cut by the base cutter is drawn with the chopping blade of the above chopping device, and chopped while feeding backward, chopped In the sugar cane harvesting machine that is designed to convey the sugar cane that has been transported diagonally upward and backward on the conveyor,
The base cutter has a portal casing, the upper horizontal portion of the portal casing is a transmission case, and the left and right legs are vertical axis cases,
A spiral butt lifter is fixed to the outer periphery of the upper surface of the rotating disk provided at the lower end of the vertical axis in the vertical axis case,
The lower end of the butt lifter is the front in the rotational direction, the upper end is the rear in the rotational direction,
The height pushed up by the butt lifter is substantially the same height as the lower rotation shaft of the upper and lower pair of chopping blades of the chopping device,
The lower surface of the upper horizontal part of the base-shaped casing of the base cutter is at a position equal to or lower than the height of the upper rotary shaft of the upper and lower pair of chopping blades of the chopping device,
A sugar cane harvesting machine, wherein the upper and lower shredder blades of the chopping device are each provided with three rotating blades.

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