Air-jet-form adjustment structure for large-sized combine-harvester and large-sized combine-harvester including the same

Abstract

To provide an air-jet-form adjustment structure for large-sized combine-harvesters capable of harvesting a large amount of beans such as Adzuk beans at a time, while reducing falling of the beans and pods when reaping the beans such as the Adzuk beans and greatly reducing the loss of yield regardless of sowing in various ridge widths.SOLUTION: An air-jet-form adjustment structure for large-sized combine-harvesters comprises: a long hole 26a1-1' formed at a part of a main pipe 26a' disposed parallel to a cutting blade and having such a size as to surround connecting portions of a large number of branch pipes 26b' connected to each other at prescribed intervals apart; first male screws 26b2-1' provided at ends in a connecting side, of the respective branch pipes; a plurality of branch pipe connecting units 2 each including a pair of first female screws 2b3 into which the first male screws can be screwed and capable of attaching / detaching a pair of branch pipes; and a branch pipe connecting unit fixing member 3 for fixing the respective branch pipe connecting units to the main pipe. The air-jet-form adjustment structure is configured to adjust intervals between the respective branch pipes connected to the main pipe and an approximately horizontal direction of tips of the branch pipes.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an air ejection configuration adjustment structure for a large combine harvester, which is equipped with a cutting section for harvesting agricultural grains, the cutting section comprising a cutting blade, a raking reel, and an air ejection device, the air ejection device comprising a main pipe and a number of branch pipes each connected to the main pipe at a predetermined interval and ejecting air from its tip toward the cutting blade side, and to a large combine harvester equipped with the same, for efficiently harvesting beans such as azuki beans with minimal loss. [Background technology]

[0002] Conventionally, large combine harvesters have been equipped with a running section 10 that moves the main body, a harvesting section 20 that harvests agricultural grains, a transporting section 30 equipped with a conveyor 31 that transports the harvested agricultural grains, a threshing section 40 that threshes the transported agricultural grains, a sorting section 50 that sorts the threshed grains, and a straw waste processing section 60 that shreds the straw discharged by the threshing section 40, as shown in Figures 13 and 14, for example.

[0003] The harvesting section 20 of this type of combine harvester includes, for example, a platform 21, a cutting blade 22 for harvesting agricultural grains, a scraping reel 23 for scraping the agricultural grains toward the cutting blade 22, and a lateral feed auger 24 for sending the agricultural grains harvested by the cutting blade 22 to the conveying section 30, as shown in Figures 15 and 16. The cutting blade 22 is configured as a clipper-shaped blade extending in the left-right direction, and is provided on the front lower edge of the platform 21. The pick-up reel 23 is configured to include a pair of reel support arms 23a, a reel spindle 23b provided between the tips of the reel support arms 23a, reel forming arms 23c extending radially from the left and right ends of the reel spindle 23b, a connecting piece 23d connecting the reel forming arms 23c, a tine bar 23e installed between the tips of the reel forming arms 23c, tines 23f hung at a predetermined interval from the tine bar 23e, a rotation drive means (reference number omitted) that rotates the reel spindle 23b, and a position adjustment means (reference number omitted) that can adjust the position up, down, front, and back. The pick-up reel 23 is disposed above the platform 21 so that it can pick up agricultural grains toward the cutting blade 22. The lateral feed auger 24 is provided with a pair of spiral members 24b symmetrically arranged on the outer periphery of a cylindrical member 24a, and with raking fingers 24c arranged in the radial direction.When rotated by a rotary drive means (symbol omitted), the lateral feed auger 24 is configured to laterally feed the agricultural grains cut by the cutting blade 22 to the area where the conveying section 30 is provided. In addition, a grass-dividing member 25 for dividing agricultural grains in the harvesting range in the field is attached to both front end portions of the platform 21.

[0004] When harvesting agricultural grains, this type of combine travels via the traveling section 10, grasses the agricultural grains in the cutting range with the grass-dividing member 25, and then the agricultural grains in the cutting range that have been grassed by the grass-dividing member 25 are raked into the cutting blade 22 by the rotating raking reel 23, and the roots of the stalks of the raking grains are cut by the cutting blade 22. The pair of rotating lateral feed augers 24 feed the reaped agricultural grains laterally to a portion where the conveying section 30 is provided, and the conveyor 31 of the conveying section 30 conveys the lateral fed agricultural grains to the threshing section 40, where the sorting section 50 sorts the threshed grains, and the straw discharged by the threshing section 40 is shredded and discharged to the outside by the straw waste processing section 60. Such combine harvesters are disclosed in the following Patent Documents 1 and 2.

[0005] Further, among conventional large combine harvesters, there is one having a structure in which a cutting section 20' is further provided with an air ejection device 26' in addition to a cutting blade 22' and a raking reel 23' as shown in FIG. In this type of combine harvester, for example, as shown in FIG. 18, an air ejection device 26' includes a main pipe 26a' and a number of elongated branch pipes 26b'. The main pipe 26a' is configured by connecting a hose and a pipe. One end of the main pipe 26a' is connected to a centrifugal blower 26c'. The main pipe 26a' has a portion 26a1' disposed in front of and above the cutting blade 22' and approximately parallel to the cutting blade 22'. The other end of the main pipe 26a' is closed by a lid (reference number omitted). The branch pipes 26b' are connected at predetermined intervals to portions 26a1' of the main pipe 26a' that are disposed approximately parallel to the cutting blade 22'. The branch pipes 26b' are bent near the tip end 26b1' toward the cutting blade 22' located rearward and below. The branch pipes 26b' are configured to eject air from the tip end 26b1' toward the cutting blade 22' in an approximately horizontal direction. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2009-171851 A [Patent Document 2] JP 2009-171917 A [Non-patent literature]

[0007] [Non-Patent Document 1] Auger heads, [online], https: / / awsairbar.com / products / auger-heads / Summary of the Invention [Problem to be solved by the invention]

[0008] Conventionally, when harvesting beans such as adzuki beans, there has been a problem in that when the beans are harvested, the weight of the beans and pods themselves, or the impact of contact with the cutting blade or the tines of the scraping reel, causes the beans and pods to pop out of the pods, causing them to fall below the platform instead of being sent to the lateral feed auger at the rear of the platform, which can easily result in a loss of harvest. In order to send the harvested beans and pods to the lateral feed auger at the rear of the platform, it is considered necessary to spray air from the front toward the cutting blade, as in the large combine harvester equipped with an air spray device shown in Figures 17 and 18.

[0009] However, in large combine harvesters of the type shown in Figures 17 and 18 that are equipped with an air blowing device that blows air from the front toward the cutting blade, the spacing of the branch pipes does not match the standard row width for common beans such as azuki beans, and the branch pipes are likely to collide with the beans such as azuki beans and cause them to fall just before harvesting. In addition, the single branch pipe installed on large combine harvesters does not provide enough airflow to send the beans and pods to the rear after harvesting without them falling. For this reason, it has been difficult to harvest beans such as azuki beans without loss using a large combine harvester equipped with an air ejection device that ejects air from the front toward the cutting blade, as shown in Figures 17 and 18, and no large combine harvester has been developed that can harvest beans such as azuki beans without loss.

[0010] However, the inventors of the present invention have repeatedly studied and gone through trial and error to realize the harvesting of beans such as adzuki beans without loss using a large combine harvester equipped with an air ejection device as shown in Figures 17 and 18, which had not previously been possible. More specifically, in order to ensure sufficient airflow to send the beans and pods rearward after harvesting without causing them to fall, and to conform to the standard row width for common beans such as adzuki beans, a prototype was created in which the existing holes in the main pipe of a large combine were blocked and new holes were drilled, and the arrangement of branch pipes connected to the main pipe was changed, and repeated tests were conducted. As a result, they were able to create a prototype large combine harvester with a branch pipe in the main pipe, enabling it to harvest large amounts of beans, such as azuki beans, at once without losing any harvest.

[0011] In recent years, in order to improve productivity, there has been active development of improved varieties of beans such as adzuki beans, and test cultivation has been carried out with sowing widths that differ from the conventional standard ridge widths. For this reason, it is expected that in the future, beans such as adzuki beans will be sown with various ridge widths that differ from the conventional standard ridge widths.

[0012] However, in the prototype of the large combine harvester created by the inventors, the existing holes in the main pipe are blocked and new holes are drilled to change the arrangement of the branch pipes connected to the main pipe, and the connection positions of the branch pipes attached to the main pipe cannot be freely and easily changed. Therefore, with the prototype of the large combine harvester created by the inventors, it is difficult to harvest beans sown with various ridge widths without loss.

[0013] The present invention has been made in consideration of the above problems, and relates to a large-scale combine harvester equipped with a reaping section for reaping agricultural grains, the reaping section comprising a cutting blade, a raking reel and an air blowing device, the air blowing device comprising a main pipe and a number of branch pipes each connected to the main pipe at a predetermined interval and blowing air from its tip toward the cutting blade, the present invention relates to a large-scale combine harvester equipped with a reaping section for reaping agricultural grains, the reaping section comprising a reaping blade, a raking reel and an air blowing device, the air blowing device comprising a main pipe and a number of branch pipes each connected to the main pipe at a predetermined interval and blowing air from its tip toward the cutting blade, the present invention relates to a large-scale combine harvester equipped with a reaping section for reaping agricultural grains, the air blowing device comprising a main pipe and a number of branch pipes each connected to the main pipe at a predetermined interval and blowing air from its tip toward the cutting blade, the branch pipes do not collide with the beans and pods immediately before reaping, regardless of whether seeds are sown with various furrow widths, and the weight of the beans and pods when reaped and the type of the reaping blade and the raking reel are not affected by the weight of the beans and pods when reaped, ... regardless of whether seeds are sown with various furrow widths, and the air blowing device is equipped with a main pipe and a number of branch pipes each connected to the main pipe and each blowing air from its tip toward the cutting blade To provide an air ejection form adjustment structure for a large combine harvester, which reduces the falling of beans and pods when harvesting beans such as azuki beans, which is caused by the beans popping out of the pods due to the impact of contact with the in, and feeds air so that the harvested beans such as azuki beans are more reliably sent to a lateral feed auger at the rear of the platform, thereby extremely reducing loss of harvest yield while harvesting a large amount of beans such as azuki beans at once and greatly shortening working time, and a large combine harvester equipped with the same, with extremely high harvesting efficiency. [Means for solving the problem]

[0014] In order to achieve the above object, the air ejection configuration adjustment structure for a large combine harvester according to the present invention is provided for a large combine harvester equipped with a traveling section and a cutting section that cuts agricultural grains while being moved by the traveling section, the cutting section having a cutting blade, a raking reel, and an air ejection device, the air ejection device being connected to a centrifugal type blower device, a main pipe having a portion disposed substantially parallel to the cutting blade in front of and above the cutting blade, and a number of elongated branch pipes each connected at a predetermined interval to the portion of the main pipe disposed substantially parallel to the cutting blade, bending near the tip portion toward the cutting blade located rearward and below, and ejecting air from the tip portion in a substantially horizontal direction toward the cutting blade side, the air ejection configuration adjustment structure for a large combine harvester comprising: a traveling section; a first male screw portion provided at an end of each of the branch pipes on the connection side with the main pipe; a pair of first female screw portions into which the first male screw portions can be screwed, the first male screw portion being provided at an end of each of the branch pipes on the connection side with the main pipe; a plurality of branch pipe connection units capable of attaching and detaching the pair of branch pipes; and a branch pipe connection unit fixing member that fixes each of the branch pipe connection units to the main pipe, the structure being configured to be able to adjust the spacing between the branch pipes connected to the main pipe and the approximately horizontal orientation of the tips of the branch pipes.

[0015] In addition, in the air ejection form adjustment structure for a large combine harvester of the present invention, the branch pipe connection unit has an outer shape large enough to cover a part of the elongated hole formed in the main pipe, and has a pair of holes formed in the longitudinal center with a predetermined size corresponding to the pipe diameter of the end of the connection side of the branch pipe, and further has a plurality of plate-like base members having a predetermined interval of about 40 to 50 cm from the longitudinal middle position to each longitudinal edge, and a plate-like base member that is rotatable and non-detachable in each of the holes formed in each of the plate-like base members. a pair of annular members provided on the plate-shaped base member, the pair of first female screw portions being provided on the inner periphery thereof, and the pair of first female screw portions being provided on the upper edge thereof, the pair of first female screw portions being provided on the inner periphery thereof, and the pair of first female screw portions being provided on the upper edge thereof, the pair of first female screw portions being provided on the inner periphery thereof, and the pair of first female screw portions being provided on the upper edge thereof, and an annular member fixing member that fixes the annular member to the plate-shaped base member, wherein a plurality of the branch pipe connection units, each having the first male screw portion of the branch pipe screwed into the first female screw portion of the annular member so as to cover the entire area of ​​the long hole portion formed in the main pipe, are overlapped so that the first female screw portions of adjacent branch pipe connection units are spaced apart at a desired interval, and the branch pipe connection units are fixed to the main pipe via the branch pipe connection unit fixing member, so that the arrangement interval between the branch pipes connected to the main pipe in a state where adjacent branch pipe connection units are attached to the plate-shaped base member can be adjusted to a desired interval including 50 cm and 67 cm, and by rotating the rotation amount adjustment portion in the branch pipe connection unit a desired amount and fixing the annular member via the annular member fixing member, the orientation of the tip portions of the branch pipes connected to the main pipe in a state where adjacent branch pipe connection units are attached to the plate-shaped base member can be adjusted to a desired orientation in a substantially horizontal direction.

[0016] In the air ejection form adjustment structure for a large combine harvester of the present invention, the branch pipe connection unit has an outer shape large enough to close a part of the long hole formed in the main pipe, has a pair of the first female screw portions in the longitudinal center, and further includes a plurality of plate-shaped base members having a predetermined interval of about 40 to 50 cm from the longitudinal middle position to each longitudinal edge, and a rotational screw of the branch pipe that is fixed to the vicinity of the root of the first male screw portion of each of the branch pipes and screws into the first female screw portion. a rotation amount adjustment member having an arc-shaped guide hole formed at a predetermined position on a concentric circle with an orbit that is formed on the branch pipe; a second female screw portion provided on the orbit of the guide hole of the rotation amount adjustment member fixed to the branch pipe in the plate-shaped base member where the first male screw portion of the branch pipe screws into the first female screw portion; a second male screw portion capable of screwing into the second female screw portion; and a head portion provided at a base of the second male screw portion, and the rotation amount adjustment member is fastened to the plate-shaped base member via the head portion. and a rotation amount adjustment member fixing member for fixing the branch pipe connection units to the plate-shaped base member of adjacent branch pipe connection units, wherein the branch pipe connection units are overlapped so that the first female screw portions of adjacent branch pipe connection units are spaced apart at a desired interval so as to cover the entire area of ​​the long hole portion formed in the main pipe, and the branch pipe connection units are fixed to the main pipe via the branch pipe connection unit fixing members. By attaching the branch pipe connection units to the plate-shaped base member of adjacent branch pipe connection units, the arrangement interval between the branch pipes connected to the main pipe can be adjusted to a desired interval including 50 cm and 67 cm, and when the first male screw portion of the branch pipe is screwed into the first female screw portion of the plate-shaped base member, the rotation amount adjustment member in the branch pipe connection unit is rotated a desired amount, and the rotation amount adjustment member is fixed via the rotation amount adjustment member fixing member, thereby attaching the branch pipe connection units to the plate-shaped base member of adjacent branch pipe connection units, the orientation of the tip portions of the branch pipes connected to the main pipe can be adjusted to a desired orientation in a substantially horizontal direction.

[0017] In the air ejection configuration adjustment structure for a large combine harvester of the present invention, it is preferable that the distances from the longitudinal middle positions of each of the plate-shaped base members to the longitudinal end edges of each of the plate-shaped base members are the same.

[0018] In addition, in the air ejection configuration adjustment structure for a large combine of the present invention, it is preferable to have multiple types of branch pipe connection units having different distances from the longitudinal intermediate position of each of the plate-shaped base members to each of the longitudinal end edges.

[0019] In addition, in the air ejection shape adjustment structure for a large combine of the present invention, it is preferable that the height positions of the tips of the branch pipes connected to the main pipe when attached to the plate-shaped base member of adjacent branch pipe connection units are configured so that they can be adjusted to a desired height.

[0020] In addition, a large combine harvester according to the present invention is equipped with a running section and a cutting section that cuts agricultural grains while being moved by the running section, the cutting section having a cutting blade, a raking reel, and an air blowing device, the air blowing device being connected to a centrifugal type blowing device and having a main pipe having a portion that is arranged in front of and above the cutting blade and approximately parallel to the cutting blade, and a number of elongated branch pipes that are each connected to the portion of the main pipe that is arranged approximately parallel to the cutting blade at a predetermined interval, bent near the tip toward the cutting blade located rearward and below, and blow air in an approximately horizontal direction from the tip toward the cutting blade, and are characterized by being equipped with any of the air blowing shape adjustment structures for large combines of the present invention described above. Effect of the Invention

[0021] According to the present invention, in a large combine harvester equipped with a reaping section for reaping agricultural grains, the reaping section comprising a cutting blade, a raking reel and an air ejection device, the air ejection device comprising a main pipe and a number of branch pipes each connected to the main pipe at a predetermined interval and ejecting air from its tip toward the cutting blade, regardless of whether seeds are sown with various furrow widths, the branch pipes do not collide with the beans and pods immediately before reaping, and when the beans and pods are reaped, the weight of the beans and pods and the tines of the cutting blade and raking reel are not applied to the air ejection device. To provide an air ejection shape adjustment structure for a large combine harvester and a large combine harvester equipped therewith that can reduce the falling of beans and pods when harvesting beans such as azuki beans, which is caused by the beans popping out of the pods due to the impact of contact, and can more reliably send the harvested beans such as azuki beans to the lateral feed auger at the rear of the platform while drastically reducing loss of harvest yield, while harvesting a large amount of beans such as azuki beans at once and significantly shortening working time. [Brief description of the drawings]

[0022] [Figure 1] 1 is an explanatory diagram showing a schematic overall configuration of an air ejection configuration adjustment structure for a large combine harvester according to a first embodiment of the present invention; [Diagram 2] FIG. 1 is an explanatory diagram showing the essential configurations of the main pipe and the branch pipe in the air ejection shape adjustment structure for a large combine harvester of the first embodiment, in which (a) is a partial plan view showing the side where the branch pipe of the main pipe is attached, (b) is an enlarged cross-sectional view along line AA of (a), (c) is a view of one branch pipe from the side, and (d) is an enlarged cross-sectional view along line BB of (c). [Diagram 3] 1A and 1B are explanatory diagrams showing the configuration of a plate-shaped base member provided in a branch pipe connection unit in an air ejection configuration adjustment structure for a large combine of the first embodiment, where (a) is a plan view and (b) is a CC cross-sectional view of (a). [Figure 4] FIG. 11 is an explanatory diagram showing the configuration of the annular member provided in the branch pipe connection unit in the air ejection configuration adjustment structure for a large combine harvester of the first embodiment, where (a) is a plan view, (b) is a side view, (c) is a DD cross-section of (a) showing the state in which a pair of annular members are provided on a plate-shaped base member, and (d) is a cross-sectional view showing the first female screw portion when the branch pipe is screwed into it. [Diagram 5] FIG. 11 is an explanatory diagram showing the configuration of the annular member fixing member provided on the branch pipe connection unit in the air ejection shape adjustment structure for a large combine of the first embodiment, where (a) is a plan view showing the positional relationship of the rotation amount adjustment part of the annular member with respect to the guide hole, and (b) is a cross-sectional view showing the positional relationship with the annular member provided on the plate-shaped base member. [Figure 6] FIG. 11 is an explanatory diagram showing the configuration of a branch pipe connection unit fixing member in the air ejection shape adjustment structure for a large combine harvester of the first embodiment, where (a) is a diagram showing the configuration of a plate belt, and (b) is a diagram showing the configuration of a U-shaped bolt. [Figure 7] FIG. 1 is an explanatory diagram showing an example of a state in which the spacing between multiple branch pipes connected to the main pipe and the horizontal orientation of the tip of each branch pipe are adjusted using the air ejection form adjustment structure for a large combine of the first embodiment, where (a) is a diagram showing the positional relationship between the branch pipes of a conventional large combine and the general ridge width of beans such as azuki beans, and (b) is a diagram showing the positional relationship between the branch pipes and the general ridge width of beans such as azuki beans when the spacing between multiple branch pipes connected to the main pipe and the horizontal orientation of the tip of each branch pipe are adjusted using the air ejection form adjustment structure for a large combine of the first embodiment. [Figure 8] 1 is an explanatory diagram showing a schematic overall configuration of an air ejection configuration adjustment structure for a large combine harvester according to a second embodiment of the present invention; FIG. [Figure 9] 10A is an explanatory diagram showing the configuration of a plate-shaped base member provided in a branch pipe connection unit in an air ejection shape adjustment structure for a large combine harvester of the second embodiment, where (a) is a plan view, (b) is an E-E cross-sectional view of (a), and (c) is a cross-sectional view showing the first female screw portion when the branch pipe is screwed into it. [Figure 10] 13 is an explanatory diagram showing the configuration of a rotation amount adjustment member provided on a branch pipe connection unit in an air ejection shape adjustment structure for a large combine of the second embodiment, where (a) is a diagram showing the mounting position with respect to one branch pipe, and (b) is a plan view. [Figure 11]An explanatory diagram showing the configuration of a rotation amount adjustment member fixing member provided on a branch pipe connection unit in an air ejection shape adjustment structure for a large combine of the second embodiment, where (a) is a plan view showing the positional relationship of the rotation amount adjustment member with respect to the guide hole, and (b) is a cross-sectional view showing the positional relationship with the plate-shaped base member. [Figure 12] FIG. 1 is an explanatory diagram showing the configuration of an air ejection shape adjustment structure for a large combine harvester according to a modified example of the present invention, in which (a) is a side view of one branch pipe, (b) is a partially enlarged cross-sectional view of (a), and (c) is a diagram showing the state in which the spacing between multiple branch pipes connected to the main piping, and the horizontal direction and height position of the tip of each branch pipe are adjusted using the air ejection shape adjustment structure for a large combine harvester according to a modified example. [Figure 13] FIG. 1 is a side view showing an example of the overall configuration of a conventional large combine harvester. [Figure 14] FIG. 14 is a top view of the large combine harvester of FIG. [Figure 15] FIG. 14 is a plan view showing an example of the configuration of the reaping section of the large combine harvester of FIG. 13. [Figure 16] FIG. 16 is a side view of the reaping section of the large combine harvester of FIG. [Figure 17] FIG. 1 is a perspective view showing an example of the overall configuration of a large combine harvester of a conventional type equipped with an air ejection device that ejects air from the front toward the cutting blade side. [Figure 18] 18A and 18B are explanatory diagrams showing an example of the configuration of an air ejection device in the large combine of FIG. 17, in which (a) is a schematic diagram showing the overall schematic configuration, and (b) is a schematic diagram seen from the side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Prior to describing the embodiments, the circumstances under which the present invention was derived and the effects of the present invention will be described. 1. How the present invention was developed (1) Problems in harvesting beans such as adzuki beans As described above, in the past, when harvesting beans such as adzuki beans, there was a problem in that the weight of the beans and pods themselves when they were harvested, or the impact of coming into contact with the cutting blade or the tines of the scraping reel, would cause the beans and pods to pop out of the pods, causing them to fall below the platform instead of being sent to the lateral feed auger at the rear of the platform, which could result in a loss of harvest volume. For this reason, it is difficult to reduce losses in the harvest yield with the large combine harvesters of the types described in Patent Documents 1 and 2 shown in Figs. 13 to 16. In order to send the harvested beans and pods to the lateral feed auger at the rear of the platform, it is considered necessary to spray air from the front toward the cutting blade, as in the large combine harvester equipped with an air spray device shown in Figures 17 and 18.

[0024] (2) Problems with large combine harvesters equipped with an air blowing device that blows air toward the cutting blade from the front However, in large combine harvesters of the type shown in Figures 17 and 18 that are equipped with an air blowing device that blows air from the front toward the cutting blade, the spacing of the branch pipes does not match the standard row width for common beans such as azuki beans, and the branch pipes are likely to collide with the beans such as azuki beans and cause them to fall just before harvesting. In addition, the single branch pipe installed on large combine harvesters does not provide enough airflow to send the beans and pods to the rear after harvesting without them falling. For this reason, in the past, it was difficult to harvest beans such as azuki beans without loss using a large combine harvester equipped with an air ejection device that ejects air from the front toward the cutting blade, as shown in Figures 17 and 18, and there were no large combine harvesters that were capable of harvesting beans such as azuki beans without loss.

[0025] (3) A trial and error process to realize the harvesting of beans such as azuki beans without loss using a large combine harvester equipped with an air blowing device that blows air from the front toward the cutting blade. As mentioned above, it has traditionally been thought that harvesting azuki beans using a large combine harvester equipped with an air ejection device that ejects air from the front toward the cutting blade, and it has not been possible to harvest azuki beans and other legumes without loss using this type of large combine harvester. However, the inventors of the present invention decided to take on the challenge of harvesting beans such as adzuki beans without loss by using a large combine harvester equipped with an air ejection device that ejects air from the front toward the cutting blade, as shown in Figures 17 and 18, which had not previously been possible. However, such trial and error was criticized by experienced farmers, agricultural cooperatives, agricultural machinery manufacturers, and other experts, who said that such trial and error was wasteful, and the project was also abandoned by officials from the manufacturer of the large combine harvester in question, so the project was unable to receive any support for its trial and error efforts. For this reason, the inventors decided to conduct repeated trial and error on their own.

[0026] (3-1) Confirmation of yield loss when harvesting azuki beans sown and cultivated with standard ridge widths using a large combine harvester equipped with an air blowing device that blows air from the front toward the cutting blade side. First, the inventors prepared a large combine harvester equipped with an air blowing device that blows air from the front toward the cutting blade side, as shown in Figures 17 and 18. In addition, in the test field, seeds were sown with a ridge width of 67 cm, which is the conventional standard. When sowing azuki beans produced in Tokachi, Hokkaido, the ridge width is usually 67 cm, and the tractor, sower, cultivator, and harvesting machine are all generally adapted to the ridge width of 67 cm. On the other hand, in the large combine harvester equipped with an air blowing device that blows air from the front toward the cutting blade side shown in Figures 17 and 18, the attachment width of the branch pipes to the main pipe is designed to be 30 cm, which does not match the width of the azuki bean rows, which is 67 cm. For this reason, it was predicted that the branch pipes would collide with many of the azuki bean pods during harvesting, resulting in a large loss of harvest volume. The inventors then used the purchased large combine to harvest the adzuki beans that had been sown and cultivated in a test field with a generally-standard ridge width. During actual test harvesting, it was confirmed that the branch pipe collided with many azuki bean pods, causing the pods to burst open and fall, resulting in a large loss of harvested yield.

[0027] (3-2) Harvesting test of adzuki beans sown and cultivated with standard ridge width using a large combine harvester equipped with an air jet device modified by adjusting the installation position of the branch pipe to match the standard ridge width The following year, the inventors of this case removed the branch pipe attached to the main pipe of the large combine harvester, welded together the holes that had been drilled in the main pipe at 30 cm intervals, and drilled new holes at 67 cm intervals and attached the branch pipes in the positions of the new holes. Then, using a large combine harvester with the branch pipe attachment position modified as described above, a harvest test was conducted on adzuki beans that had been sown and cultivated at the conventional general standard of 67 cm. When harvesting, one branch pipe was positioned at one end of a ridge in the width direction, and air was sprayed in a carpet-like pattern over the entire width of the ridge, while ensuring that the branch pipe did not collide with the adzuki beans grown in the center. The results of the harvesting test showed that the branch pipes could be prevented from colliding with the azuki bean pods during harvesting. However, with one branch pipe per ridge, the amount of air blown from the branch pipe toward the cutting blade that cuts the azuki beans was insufficient in the area away from the branch pipe in the width direction of the ridge, and the beans and pods fell after being cut by the cutting blade and could not be sent backwards.

[0028] (3-3) A harvest test of adzuki beans sown and cultivated with a standard ridge width was conducted using a large combine harvester equipped with an air ejection device modified so that the installation position of the branch pipes was adapted to the standard ridge width and air was ejected from two branch pipes per ridge. Therefore, the inventors of the present invention modified the large combine harvester by welding the holes drilled in the main pipe, drilling a pair of new holes 67 cm apart, and attaching branch pipes to the holes. When attaching the branch pipes to the holes in the main pipe, the branch pipes were fixed to the main pipe with the horizontal direction of the tips of the branch pipes oriented so that air from the tips of the branch pipes attached to the holes spaced 67 cm apart could be sprayed toward the azuki beans grown in one ridge. Then, the installation position of the branch pipes was adjusted to match the general standard ridge width, and a large combine harvester was modified so that air would be ejected from two branch pipes per ridge. Using this, harvesting tests were conducted on adzuki beans that had been sown and grown at the conventional general standard 67 cm width. Harvesting tests showed that the branch pipes could be prevented from colliding with the azuki bean pods during harvesting. Moreover, by arranging two branch pipes per ridge, the amount of air spurting from the branch pipes toward the cutting blade that cuts the azuki beans was sufficient, forming an air carpet (air bed) over the entire harvest inlet, and the beans and pods cut by the cutting blade could be sent to the rear without falling. In this way, the large combine harvester prototyped by the inventors of the present invention can harvest beans such as adzuki beans grown on multiple ridges at once while drastically reducing harvest loss caused by pods popping off when contacted with the machine and the impact of the cutting blade when harvesting, which was not possible with the past. This has greatly improved the efficiency of harvesting work and made it possible to drastically shorten harvesting time.

[0029] (4) Examination and consideration of the problems inherent in the prototype large combine harvester developed by the present inventors Furthermore, the inventors of the present invention further examined and considered the prototype of the large combine harvester that they had created. As a result, they found that the prototype had the following inherent problems. In recent years, in order to improve productivity, there has been active development of improved varieties of beans such as adzuki beans, and test cultivation has been carried out with sowing widths that differ from the conventional standard ridge widths. Therefore, in the future, it is expected that there will be the emergence of beans such as adzuki beans that are sown with various ridge widths that differ from the conventional standard ridge widths. However, the prototype of the large combine harvester created by the inventors of the present invention has a different arrangement of the branch pipes connected to the main pipe by closing the existing holes in the main pipe and drilling new holes, and it is not possible to freely and easily change the connection positions of the branch pipes attached to the main pipe. Therefore, it is difficult to harvest beans such as adzuki beans that are sown in various ridge widths without loss using the prototype of the large combine harvester created by the inventors of the present invention.

[0030] Therefore, the inventors of the present invention further studied, considered, and conducted trial and error to find a way to easily harvest, without loss, beans sown in various ridge widths using a large combine harvester. As a result, in a large combine harvester equipped with a harvesting section that harvests agricultural grains, the harvesting section comprising a cutting blade, a raking reel, and an air blowing device, the air blowing device comprising a main pipe and numerous branch pipes that are each connected to the main pipe at predetermined intervals and blow air from their tips toward the cutting blade side, regardless of the variety of row widths at which seeds are sown, the branch pipes do not collide with the beans and pods just before harvesting, reducing the falling of beans and pods when harvesting beans such as azuki beans due to the weight of the beans and pods when harvested, or the beans popping out of the pods due to the impact when they come into contact with the cutting blade or the tines of the raking reel, and air is fed in to more reliably send the harvested beans such as azuki beans to the lateral feed auger at the rear of the platform, thereby extremely reducing loss of harvest yield, and this has led to the development of the air blowing configuration adjustment structure for a large combine harvester of the present invention, and a combine harvester equipped with the same.

[0031] 2. Configuration and Effects of the Present Invention The air ejection form adjustment structure for a large combine of the present invention is provided with a traveling part and a reaping part that reaps agricultural grains while being moved by the traveling part, the reaping part having a cutting blade, a raking reel, and an air ejection device, the air ejection device being connected to a centrifugal type blower device, a main pipe having a portion disposed substantially parallel to the cutting blade in front of and above the cutting blade, and a large number of elongated branch pipes each connected at a predetermined interval to the portion of the main pipe disposed substantially parallel to the cutting blade, bent near the tip portion toward the cutting blade located rearward and below, and ejecting air from the tip portion in a substantially horizontal direction toward the cutting blade side, the large combine being provided with an air ejection form from the air ejection device. the air ejection shape adjustment structure for a large combine harvester for adjusting the distance between the main pipe and the blade; a long hole portion formed in a portion of the main pipe arranged parallel to the blade, the long hole portion being large enough to surround the connection portions of a number of branch pipes which are each connected at a predetermined interval; a first male screw portion provided at the end of each branch pipe which is connected to the main pipe; a pair of first female screw portions into which the first male screw portions can be screwed, the branch pipe connection units being multiplexed to attach and detach a pair of branch pipes; and a branch pipe connection unit fixing member which fixes each branch pipe connection unit to the main pipe, and the structure is configured to be able to adjust the distance between the branch pipes connected to the main pipe and the approximately horizontal orientation of the tips of the branch pipes.

[0032] By configuring the spacing between each branch pipe connected to the main pipe to be adjustable, as in the air ejection shape adjustment structure for large combines of the present invention, it is possible to prevent the branch pipes from colliding with the beans and pods just before harvesting, regardless of whether seeds are sown with various row widths. Furthermore, if the approximately horizontal direction of the tips of the branch pipes is adjustable, as in the air ejection shape adjustment structure for large combines of the present invention, the branch pipes can be attached and the direction of their tips adjusted so that air from two branch pipes is ejected onto beans such as adzuki beans sown and cultivated in one ridge. This reduces the falling of beans and pods when harvesting beans, such as beans popping out of the pods due to their own weight or the impact of coming into contact with the cutting blade or the tines of the scraping reel, regardless of the ridge widths of sowing, and makes it possible to send air so that the harvested beans such as adzuki beans are more reliably sent to the cross-feed auger at the rear of the platform. As a result, it is possible to greatly reduce harvest loss. Also, by using a large combine harvester, it is possible to harvest large amounts of beans such as azuki beans at once, and the work time can be significantly shortened, resulting in extremely high harvesting efficiency.

[0033] In addition, in the air ejection form adjustment structure for a large combine harvester of the present invention, preferably, the branch pipe connection unit has an outer shape large enough to cover a part of the elongated hole formed in the main pipe, and has a pair of holes formed in the longitudinal center portion to a predetermined size corresponding to the pipe diameter of the end of the branch pipe connected thereto, and further has a plurality of plate-like base members having a predetermined interval of about 40 to 50 cm from the longitudinal center position to each longitudinal edge portion, and each of the plate-like base members formed thereon. The plate-shaped base member has a pair of annular members provided with a rotation amount adjustment portion which is rotatably and non-detachably provided in the hole portion, has a pair of first female screw portions on its inner circumference, and has an arc-shaped guide hole formed at a predetermined position on the same circle as the rotation orbit on its upper edge portion, and has a second female screw portion provided on the orbit of the guide hole of each of the rotation amount adjustment portions of the annular members, a second male screw portion which screws into the second female screw portions, and a head portion provided at the base of the second male screw portion, and the rotation amount adjustment portion is adjusted via the head portion. and an annular member fixing member which fixes each annular member to the plate-like base member by tightening the adjustment portion, and a plurality of branch pipe connection units, each having a first male screw portion of a branch pipe screwed into a first female screw portion of the annular member so as to cover the entire area of ​​a long hole portion formed in the main pipe, are overlapped so that the first female screw portions of adjacent branch pipe connection units are spaced apart at a desired interval, and the branch pipe connection units are fixed to the main pipe via the branch pipe connection unit fixing member, so that the arrangement interval between the branch pipes connected to the main pipe when attached to the plate-like base members of adjacent branch pipe connection units can be adjusted to a desired interval including 50 cm and 67 cm, and by rotating the rotation amount adjustment portion in the branch pipe connection unit by a desired amount and fixing the annular member via the annular member fixing member, the orientation of the tips of the branch pipes connected to the main pipe when attached to the plate-like base members of adjacent branch pipe connection units can be adjusted to a desired orientation approximately horizontally.

[0034] With this configuration, it is possible to prevent the branch pipes from colliding with the beans and pods just before harvesting, regardless of whether seeds are sown in various ridge widths including 50 cm and 67 cm, without having to re-drill holes in the main pipe to connect the branch pipes, and it is possible to reduce the falling of beans and pods when harvesting beans such as azuki beans due to their own weight when harvested, or the beans popping out of the pods due to the impact when they come into contact with the cutting blade or the tines of the scraping reel, and it is possible to realize a configuration in which air from two branch pipes that supply air is sprayed onto beans such as azuki beans sown and cultivated in one ridge so that the harvested beans such as azuki beans are more reliably sent to the cross-feed auger at the rear of the platform. Furthermore, as in the air ejection form adjustment structure for a large combine of the present invention, the branch pipe connection unit is provided with a pair of annular members which are rotatably and non-detachably provided in respective hole portions formed in the plate-shaped base member, have a pair of first female screw portions on their inner circumference, and are equipped with a rotation amount adjustment portion on their upper edge portion which has an arc-shaped guide hole formed at a predetermined position on a circle concentric with the rotating track.Therefore, with the first male screw portion of the branch pipe screwed into the first female screw portion of the annular members, the approximately horizontal orientation of the tip of the branch pipe can be adjusted via the rotation amount adjustment portion, making it easier to prevent the attached branch pipe from loosening.

[0035] In the air ejection form adjustment structure for a large combine harvester of the present invention, the branch pipe connection unit preferably has an outer shape large enough to close a part of the elongated hole formed in the main pipe, has a pair of first female screw portions in the longitudinal center, and further includes a plurality of plate-shaped base members having a predetermined interval of about 40 to 50 cm from the longitudinal middle position to each longitudinal edge, and is fixed to the vicinity of the root of the first male screw portion of each branch pipe, and the first male screw portion is fixed to the first female screw portion. The rotation amount adjustment member has an arc-shaped guide hole formed at a predetermined position on the same circle as the rotation track of the screwed branch pipe, and a plate-shaped base member in which a first male screw of the branch pipe screws into a first female screw, the plate-shaped base member has a second female screw provided on the track of the guide hole of the rotation amount adjustment member fixed to the branch pipe, a second male screw capable of screwing into the second female screw, and a head provided at the base of the second male screw, and the rotation amount adjustment member is tightened via the head. and a rotation amount adjustment member fixing member that fixes the member to the plate-shaped base member, and the branch pipe connection units are overlapped so that the first female screw portions of adjacent branch pipe connection units are spaced apart at a desired distance so as to cover the entire area of ​​the long hole portion formed in the main pipe, and the branch pipe connection units are fixed to the main pipe via the branch pipe connection unit fixing member. By attaching the branch pipe connection units to the plate-shaped base members of adjacent branch pipe connection units, the arrangement distance between the branch pipes connected to the main pipe can be adjusted to a desired distance including 50 cm or 67 cm, and when the first male screw portion of the branch pipe is screwed into the first female screw portion of the plate-shaped base member, the rotation amount adjustment member in the branch pipe connection unit is rotated a desired amount and fixed via the rotation amount adjustment member fixing member, so that the orientation of the tips of the branch pipes connected to the main pipe can be adjusted to a desired orientation in a substantially horizontal direction by attaching the branch pipe connection units to the plate-shaped base members of adjacent branch pipe connection units.

[0036] With this configuration, it is possible to avoid drilling holes in the main pipe to connect the branch pipes again, and regardless of whether seeds are sown in various ridge widths including 50 cm and 67 cm, it is possible to prevent the branch pipes from colliding with the beans and pods just before harvesting, while reducing the falling of beans and pods when harvesting beans such as azuki beans due to their own weight when harvested, or the beans popping out of the pods due to the impact when they come into contact with the cutting blade or the tines of the scraping reel, and it is possible to realize a configuration in which air from two branch pipes that supply air is sprayed onto beans such as azuki beans sown and cultivated in one ridge so that the harvested beans, such as azuki beans, are more reliably sent to the cross-feed auger at the rear of the platform. Furthermore, as in the air ejection form adjustment structure for a large combine of the present invention, if the branch pipe connection unit is configured to include a plurality of plate-shaped base members having a pair of first female screw portions, a rotation amount adjustment member fixed to the vicinity of the base of the first male screw portion of each branch pipe and having an arc-shaped guide hole formed at a predetermined position on a concentric circle with the rotational orbit of the branch pipe where the first male screw portion screws into the first female screw portion, and a rotation amount adjustment member fixing member, it is possible to simplify the configuration for adjusting the approximately horizontal orientation of the tip of the branch pipe.

[0037] In the air ejection configuration adjustment structure for a large combine harvester of the present invention, preferably, the distances from the longitudinal middle positions of the respective plate-like base members to the longitudinal end edges of the respective branch pipe connection units are the same. With this configuration, it is possible to manufacture a large number of branch pipe connection units of the same standard so that the branch pipes do not collide with the beans and pods just before harvesting, regardless of whether seeds are sown in various row widths including 50 cm and 67 cm, without having to re-drill holes in the main pipe to connect the branch pipes, thereby reducing costs.

[0038] In addition, the air ejection configuration adjustment structure for a large combine harvester of the present invention preferably has multiple types of branch pipe connection units with different distances from the longitudinal intermediate position of each plate-shaped base member to each longitudinal end edge. With this configuration, it is possible to accommodate sowing with a wider range of furrow widths and to prevent the branch pipes from colliding with the beans and pods just before harvesting.

[0039] In addition, in the air ejection shape adjustment structure for a large combine of the present invention, it is preferable that the height positions of the tips of the branch pipes connected to the main pipe when attached to the plate-shaped base member of adjacent branch pipe connection units are configured so that they can be adjusted to a desired height. With this configuration, it is possible to avoid the collision of the carpet of air sprayed from the two branch pipes facing each other for one ridge, and to prevent the creation of spatial areas where the wind pressure is offset and attenuated. This also makes it possible to prevent a situation where a sufficient amount of air is not sprayed onto the beans and pods of harvested azuki beans, causing them to fall, thereby making it possible to further reduce the loss of harvest volume during harvesting.

[0040] In addition, the large combine of the present invention is equipped with a running section and a cutting section that cuts agricultural grains while being moved by the running section, the cutting section having a cutting blade, a raking reel, and an air blowing device, the air blowing device being connected to a centrifugal type blowing device and having a main pipe having a portion that is arranged approximately parallel to the cutting blade in front of and above the cutting blade, and a number of elongated branch pipes that are each connected to the portion of the main pipe that is arranged approximately parallel to the cutting blade at a predetermined interval, bent near the tip toward the cutting blade located rearward and below, and blowing air in an approximately horizontal direction from the tip toward the cutting blade side, and is equipped with any of the air blowing shape adjustment structures for large combines of the present invention described above.

[0041] With this configuration, it is possible to prevent the branch pipes from colliding with the beans and pods just before harvesting, regardless of whether the seeds are sown in various ridge widths, without having to re-drill holes in the main pipe to connect the branch pipes, and at the same time, it is possible to reduce the falling of beans and pods when harvesting beans such as azuki beans, which is caused by the weight of the beans and pods when harvested, or the beans popping out of the pods due to the impact when they come into contact with the cutting blade or the tines of the raking reel, and it is possible to feed air so that the harvested beans such as azuki beans are more reliably sent to the lateral feed auger at the rear of the platform. As a result, it is possible to greatly reduce the loss of the harvest volume. Moreover, it is possible to harvest a large amount of beans such as azuki beans at once, and the working time can be significantly shortened, so the harvesting efficiency is extremely high.

[0042] Therefore, according to the present invention, in a large combine harvester equipped with a reaping section for reaping agricultural grains, the reaping section being provided with a cutting blade, a raking reel, and an air ejection device, the air ejection device being provided with a main pipe and a number of branch pipes each connected to the main pipe at a predetermined interval and ejecting air from its tip toward the cutting blade, regardless of whether seeds are sown with various furrow widths, the branch pipes are not caused to collide with the beans and pods immediately before reaping, and the weight of the beans and pods when reaped and the type of the cutting blade and raking reel are taken into consideration. To provide an air ejection shape adjustment structure for a large combine harvester and a large combine harvester equipped with the same, which reduces the falling of beans and pods when harvesting beans such as azuki beans, which is caused by the beans popping out of the pods due to the impact of contact with the in, and feeds air so that the harvested beans such as azuki beans are more reliably sent to the lateral feed auger at the rear of the platform, thereby making it possible to harvest a large amount of beans such as azuki beans at once while drastically reducing loss of harvest yield and greatly shortening working time.

[0043] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is an explanatory diagram showing the overall schematic configuration of the air ejection configuration adjustment structure for a large combine harvester according to the first embodiment of the present invention. Fig. 2 is an explanatory diagram showing the main pipe and the main pipe in the air ejection configuration adjustment structure for a large combine harvester according to the first embodiment, where (a) is a partial plan view showing the side where the branch pipe of the main pipe is attached, (b) is an enlarged AA cross-sectional view of (a), (c) is a side view of one branch pipe, and (d) is an enlarged BB cross-sectional view of (c). Fig. 3 is an explanatory diagram showing the configuration of a plate-shaped base member provided in the branch pipe connection unit in the air ejection configuration adjustment structure for a large combine harvester according to the first embodiment, where (a) is a plan view and (b) is a CC cross-sectional view of (a). 4 is an explanatory diagram showing the configuration of the annular member provided in the branch pipe connection unit in the air ejection form adjustment structure for a large combine harvester of the first embodiment, (a) is a plan view, (b) is a side view, (c) is a view showing a state in which a pair of annular members are provided on a plate-shaped base member in a DD cross section of (a), and (d) is a cross-sectional view showing a first female screw portion in a state in which a branch pipe is screwed. FIG. 5 is an explanatory diagram showing the configuration of the annular member fixing member provided in the branch pipe connection unit in the air ejection form adjustment structure for a large combine harvester of the first embodiment, (a) is a plan view showing the positional relationship of the rotation amount adjustment portion of the annular member with respect to the guide hole, and (b) is a cross-sectional view showing the positional relationship with the annular member provided on the plate-shaped base member. FIG. 6 is an explanatory diagram showing the configuration of the branch pipe connection unit fixing member in the air ejection form adjustment structure for a large combine harvester of the first embodiment, (a) is a view showing the configuration of the plate belt, and (b) is a view showing the configuration of the U-shaped bolt. Figure 7 is an explanatory diagram showing an example of a state in which the spacing between multiple branch pipes connected to the main pipe and the horizontal direction of the tip of each branch pipe are adjusted using the air ejection form adjustment structure for a large combine of the first embodiment, where (a) is a diagram showing the positional relationship between the branch pipes of a conventional large combine and the general ridge width of beans such as azuki beans, and (b) is a diagram showing the positional relationship between the branch pipes and the general ridge width of beans such as azuki beans when the spacing between multiple branch pipes connected to the main pipe and the horizontal direction of the tip of each branch pipe are adjusted using the air ejection form adjustment structure for a large combine of the first embodiment.

[0044] The air ejection configuration adjustment structure 1 for a large combine of this embodiment is a structure applicable to a large combine, for example, as shown in Figures 17 and 18, which is equipped with a running part (symbol omitted) and a cutting part 20' that cuts agricultural grains while being moved by the running part, the cutting part 20' having a cutting blade 22', a scraping reel 23' and an air ejection device 26', the air ejection device 26' being connected to a centrifugal type blower 26c', a main pipe 26a' having a portion 26a1' arranged substantially parallel to the cutting blade 22' in front of and above the cutting blade 22', and a number of elongated branch pipes 26b' that are each connected at a predetermined interval to the portion 26a1' of the main pipe 26a' arranged substantially parallel to the cutting blade 22', bent near the tip 26b1' toward the cutting blade 22' located rearward and below, and eject air in a substantially horizontal direction from the tip 26b1' toward the cutting blade side. The air ejection configuration adjustment structure 1 for a large combine harvester in this embodiment has, for example, as shown in Figure 1, a long hole portion 26a1-1' formed in the main pipe 26a', a first male screw portion 26b2-1' provided on each branch pipe 26b', a plurality of branch pipe connection units 2 to which a pair of branch pipes 26b' can be attached and detached, and a branch pipe connection unit fixing member 3, and is configured to be able to adjust the spacing between each branch pipe 26b' connected to the main pipe 26a' and the approximately horizontal orientation of the tip portion 26b1' of the branch pipe 26b'.

[0045] The long hole portion 26a1-1' is formed in a portion 26a1' arranged parallel to the cutting blade (not shown) of the main pipe 26a', for example, as shown in Figures 2(a) and 2(b), and has a size sufficient to surround the connection portions of a number of branch pipes 26b' that are each connected at a predetermined interval.

[0046] The first male screw portion 26b2-1' is provided on an end portion 26b2' of each branch pipe 26b' on the connection side with the main pipe 26a', as shown in, for example, FIGS. 2(c) and 2(d).

[0047] The branch pipe connection unit 2 is configured to include a plate-shaped base member 2a, a pair of annular members 2b, and an annular member fixing member 2c.

[0048] 3(a) and 3(b), the plate-shaped base member 2a has an outer shape large enough to cover a part of the elongated hole 26a1-1' formed in the main pipe 26a'. The plate-shaped base member 2a has a pair of holes 2a1 in the longitudinal center thereof, the holes 2a1 being formed to a predetermined size corresponding to the pipe diameter of the end 26b2' of the branch pipe 26b' on the connection side (with the main pipe 26a'). Furthermore, the plate-like base member 2a has a predetermined distance of about 40 to 50 cm from the longitudinal center position to each longitudinal edge.

[0049] The pair of annular members 2b, as shown in Figures 4(a) to 4(c), are configured to have a cylindrical portion 2b1 and flange portions 2b2 at both ends of the cylindrical portion 2b1, and are rotatably and non-detachably provided in respective holes 2a1 formed in the respective plate-like base members 2a. Also, as shown in Figure 4(d), for example, the inner periphery of the pair of annular members 2b has a pair of first female screw portions 2b3 that can screw in a first male screw portion 26b2-1' provided in an end portion 26b2' of the branch pipe 26b' on the connection side (with the main pipe 26a'). Furthermore, the pair of annular members 2b are provided at their upper edges with rotation amount adjustment portions 2b4. The rotation amount adjustment portions 2b4 have arc-shaped guide holes 2b4-1 formed at predetermined positions on a circle concentric with the rotation path of the annular members 2b.

[0050] As shown in Fig. 5(a) and Fig. 5(b), the annular member fixing member 2c has a second female screw portion 2c1 provided on the track of the guide hole 2b4-1 of the rotation amount adjustment portion 2b4 of each annular member 2b in each plate-like base member 2a, a second male screw portion 2c2 screwed into the second female screw portion 2c1, and a head portion 2c3 provided at the base of the second male screw portion 2c2. The annular member 2b is fixed to the plate-like base member 2a by tightening the rotation amount adjustment portion 2b4 via the head portion 2c3.

[0051] The branch pipe connection unit fixing member 3 has, for example, a plate belt 3a and a U-bolt 3b, as shown in Figures 6(a) and 6(b), and is configured so as to be able to fix each branch pipe connection unit 2 to the main pipe 26a'. The plate belt 3a is used to wrap and fix the plate-shaped base member 2a of the branch pipe connection unit 2 around the main pipe 26a'. The U-bolt 3b is used to connect to both ends 3a1, 3a2 of the plate belt 3a, thereby maintaining the branch pipe connection unit 2 fixed to the main pipe 26a'. The branch pipe connection unit 2 is fixed to the main pipe 26a' using the branch pipe connection unit fixing member 3 by wrapping the plate belt 3a around the main pipe 26a' to hold down the overlapping portions of the plate-shaped base members 2a of adjacent branch pipe connection units 2, which are positioned so as to cover the long hole portions 26a1-1' of the main pipe 26a', and screwing and joining the U-shaped bolts 3b to both ends 3a1, 3a2 of the plate belt 3a via nuts not shown.

[0052] The following describes the procedure for adjusting the spacing between the multiple branch pipes 26b' connected to the main pipe 26a' and the approximately horizontal orientation of the tip ends 26b1' of each branch pipe 26b' using the air ejection configuration adjustment structure 1 for a large combine of the first embodiment configured in this manner. First, the first male screw portion 26b2-1' of the branch pipe 26b' is screwed into the first female screw portion 2b3 of the pair of annular members 2b provided on the plate-like base member 2a of each branch pipe connection unit 2 so as to be rotatable and undetachable. Next, a plurality of branch pipe connection units 2, each having the first male screw portion 26b2-1' of the branch pipe 26b' screwed into the first female screw portion 2b3 of the annular member 2b, are stacked so that the first female screw portions 2b3 of adjacent branch pipe connection units 2 are spaced apart at a desired interval so as to block a predetermined area of ​​the long hole portion 26a1-1' formed in the main pipe 26a'. Then, the branch pipe connection units 2 are fixed to the main pipe 26a' via the branch pipe connection unit fixing member 3. These operations are repeated until the entire area of ​​the long hole portion 26a1-1' formed in the main pipe 26a' is blocked. At this time, there is a predetermined interval of about 40 to 50 cm from the longitudinal center position of the plate-like base member 2a to each longitudinal edge portion. Therefore, the arrangement interval between the branch pipes 26b' connected to the main pipe 26a' when attached to the plate-like base member 2a of adjacent branch pipe connection units 2 can be adjusted to a desired interval including 50 cm and 67 cm. Next, the rotation amount adjustment parts 2b4 of each branch pipe connection unit 2 fixed to the main pipe 26a' are rotated by a desired amount, and the annular member 2b is fixed via the annular member fixing member 2c. As a result, for example, as shown in Fig. 7(b), the orientations of the tip ends 26b1' of the branch pipes 26b' connected to the main pipe 26a' in a state attached to the plate-like base members 2a of adjacent branch pipe connection units 2 can be adjusted to a desired orientation in the substantially horizontal direction (the orientation in which the amount of air sprayed toward beans such as adzuki beans sown and cultivated in one furrow from the tip ends 26b1' of the two branch pipes 26b' is optimized).

[0053] In the air ejection configuration adjustment structure 1 for a large combine of this embodiment, it is preferable to configure each branch pipe connection unit 2 so that the distance from the longitudinal middle position of each plate-shaped base member 2a to each longitudinal edge portion is the same, since this enables a large number of branch pipe connection units 2 to be manufactured to the same standard, thereby reducing costs. In addition, the air ejection configuration adjustment structure 1 for a large combine harvester of this embodiment may be configured to have multiple types of branch pipe connection units 2 with different intervals from the longitudinal middle position to the longitudinal edge of each plate-like base member 2a. With this configuration, it is possible to accommodate sowing with more ridge widths and prevent the branch pipes from colliding with beans and pods just before harvesting.

[0054] Second embodiment FIG. 8 is an explanatory diagram showing a schematic overall configuration of the air ejection form adjustment structure for a large combine harvester according to the second embodiment of the present invention. FIG. 9 is an explanatory diagram showing the configuration of a plate-shaped base member provided in a branch pipe connection unit in the air ejection form adjustment structure for a large combine harvester according to the second embodiment, where (a) is a plan view, (b) is an E-E sectional view of (a), and (c) is a sectional view showing a first female screw portion in a state in which a branch pipe is screwed. FIG. 10 is an explanatory diagram showing the configuration of a rotation amount adjustment member provided in a branch pipe connection unit in the air ejection form adjustment structure for a large combine harvester according to the second embodiment, where (a) is a view showing an attachment position for one branch pipe, and (b) is a plan view. FIG. 11 is an explanatory diagram showing the configuration of a rotation amount adjustment member fixing member provided in a branch pipe connection unit in the air ejection form adjustment structure for a large combine harvester according to the second embodiment, where (a) is a plan view showing the positional relationship of the rotation amount adjustment member with respect to the guide hole, and (b) is a sectional view showing the positional relationship with the plate-shaped base member.

[0055] The air ejection mode adjustment structure 1' for a large combine harvester of this embodiment has a plurality of branch pipe connection units 2' to which a pair of branch pipes 26b' can be attached / detached, for example, as shown in FIG. The branch pipe connection unit 2' is configured to include a plate-shaped base member 2a', a rotation amount adjustment member 2b', and a rotation amount adjustment member fixing member 2c'.

[0056] As shown in Fig. 9, the plate-shaped base member 2a' has an outer shape large enough to cover a part of the elongated hole 26a1-1' formed in the main pipe 26a'. The plate-shaped base member 2a' has a pair of first female screw portions 2a1' in the longitudinal center thereof, into which the first male screw portions 26b2-1' provided in the end portion 26b2' of the branch pipe 26b' on the connection side (with the main pipe 26a') can be screwed. The plate-shaped base member 2a' has a predetermined distance of about 40 to 50 cm from the longitudinal center position to each longitudinal edge portion.

[0057] The rotation amount adjustment member 2b' is fixed near the base of the first male screw portion 26b2-1' of each branch pipe 26b', as shown in Figures 10(a) and 10(b), for example, and has an arc-shaped guide hole 2b1' formed at a predetermined position on a concentric circle with the rotational orbit of the branch pipe 26b' in which the first male screw portion 26b2-1' screws into the first female screw portion 2a1'.

[0058] 11(a) and 11(b), the rotation amount adjustment member fixing member 2c' has a second female screw portion 2c1' provided on the track of the guide hole 2b1' of the rotation amount adjustment member 2b' fixed to the branch pipe 26b' in the plate-shaped base member 2a' where the first male screw portion 26b2-1' of the branch pipe 26b' is screwed into the first female screw portion 2a1', a second male screw portion 2c2' that can be screwed into the second female screw portion 2c1', and a head portion 2c3' provided at the base of the second male screw portion 2c2'. The rotation amount adjustment member 2b' is fixed to the plate-shaped base member 2a' by tightening the rotation amount adjustment member 2b' via the head portion 2c3'. The other configurations are substantially the same as those of the air ejection configuration adjustment structure 1 for a large combine harvester of the first embodiment.

[0059] The following describes the procedure for adjusting the spacing between multiple branch pipes 26b' connected to the main pipe 26a' and the approximately horizontal orientation of the tip ends 26b1' of each branch pipe 26b' using the second embodiment of the air ejection configuration adjustment structure 1' for a large combine harvester configured in this manner. First, a plurality of branch pipe connection units 2' are overlapped so that the first female screw parts 2a1' of adjacent branch pipe connection units 2' are spaced apart at a desired interval so as to block a predetermined area of ​​the long hole part 26a1-1' formed in the main pipe 26a'. Then, the branch pipe connection units 2' are fixed to the main pipe 26a' via the branch pipe connection unit fixing member 3. This operation is repeated until the entire area of ​​the long hole part 26a1-1' formed in the main pipe 26a' is blocked. At this time, there is a predetermined interval of about 40 to 50 cm from the longitudinal center position of the plate-like base member 2a' to each longitudinal edge part. Therefore, by attaching the branch pipe connection units 2' to the plate-like base member 2a' of adjacent branch pipes, the arrangement interval between the branch pipes 26b' connected to the main pipe 26a' can be adjusted to a desired interval including 50 cm and 67 cm. Next, the first male screw portion 26b2-1' of the branch pipe 26b' is screwed into the first female screw portion 2a1' of the plate-like base member 2a' in each branch pipe connection unit 2' fixed to the main pipe 26a'. At that time, the rotation amount adjustment member 2b' in the branch pipe connection unit 2' is rotated by a desired amount, and the rotation amount adjustment member 2b' is fixed via the rotation amount adjustment member fixing member 2c'. As a result, the orientation of the tip portions 26b1' of the branch pipes 26b' connected to the main pipe 26a' by attaching them to the plate-like base members 2a' of adjacent branch pipe connection units 2' can be adjusted to a desired orientation in the approximately horizontal direction (the orientation in which the amount of air sprayed to beans such as adzuki beans sown and cultivated in one ridge from the tip portions 26b1' of the two branch pipes 26b' is optimal).

[0060] Next, a case will be described in which, for example, as shown in FIG. 7, a large combine harvester in which the interval between the multiple branch pipes 26b' connected to the main pipe 26a' and the direction of the tip 26b1' of each branch pipe 26b' are adjusted horizontally through the air ejection form adjustment structure 1, 1' for a large combine harvester of the first and second embodiments is used to harvest beans such as adzuki beans that are ripening at a height close to the ground. In addition, since beans such as adzuki beans tend to pop out of the pods due to impact, it is desirable to remove the raking reel when harvesting. Here, a case will be described in which the beans are harvested with the raking reel removed. In this example, adzuki beans that have been sown and cultivated with a ridge width of 67 cm are harvested, and the interval between the branch pipes 26b' connected to the main pipe 26a' is adjusted to 67 cm, and the approximately horizontal direction of the tip 26b1' of the two branch pipes 26b' is adjusted to face the adzuki beans in one ridge. The reaping unit is moved toward the azuki beans. As the reaping blade approaches the azuki beans, the two branch pipes 26b' pass through both sides of the azuki beans in each ridge without colliding with the beans and pods. Therefore, beans hardly pop out of the pods of the azuki beans cultivated in each ridge. When the cutting blade approaches the position for cutting the azuki beans, the two branch pipes 26b', the positions and orientations of which are adjusted to correspond to the respective ridges, reach a position where air is sprayed from the tip 26b1' in an approximately horizontal direction toward the azuki beans on the cutting blade side. Furthermore, as the cutting part continues to travel, the cutting blade cuts the legume pods and the stems containing the pods.

[0061] Meanwhile, beans such as adzuki beans, unlike barley and wheat, have the following characteristics: they tend to bear fruit close to the ground, each fruit is large and heavy, and they need to be dried before harvesting. For this reason, when harvesting beans such as adzuki beans using a conventional large combine that does not have the air ejection shape adjustment structure 1, 1' for a large combine of the first and second embodiments, the weight of the beans and pods when they are cut by the cutting blade, and the impact of contacting the cutting blade or the tines of the scraping reel, cause the beans to easily pop out of the pods and fall. Furthermore, weeds are likely to grow in fields where beans such as adzuki beans are cultivated. If beans such as adzuki beans are harvested using a conventional combine harvester in a field where weeds have grown, the beans and pods cut by the blade will be blocked by the weeds from moving from the position of the blade toward the lateral feed auger at the rear of the platform, and will easily fall below the platform, which may result in even greater losses in the harvest yield.

[0062] However, when a large combine is used in which the spacing between the multiple branch pipes 26b' connected to the main pipe 26a' and the direction of the tip 26b1' of each branch pipe 26b' are adjusted horizontally via the air ejection configuration adjustment structure 1, 1' for a large combine of the first and second embodiments, the strong wind pressure of the air ejected from the tip 26b1' of the two branch pipes 26b' for each ridge causes the beans and pods that would otherwise fall to be sent to the lateral feed auger at the rear of the platform together with the cut weeds. The harvested adzuki beans are fed laterally by a pair of rotating lateral feed augers 24 to a section where the conveying section 30 is provided, similar to the combine harvester shown in Figures 13 to 16. The fed laterally beans are transported to the threshing section 40 by the conveyor 31 of the conveying section 30. The threshed grains are sorted by the sorting section 50. The straw and weeds discharged by the threshing section 40 are chopped by the straw waste processing section 60 and discharged to the outside.

[0063] In this way, it has been confirmed that when azuki beans are harvested using a large combine in which the spacing between the multiple branch pipes 26b' connected to the main pipe 26a' and the direction of the tip 26b1' of each branch pipe 26b' are adjusted horizontally via the air ejection shape adjustment structure 1, 1' for a large combine of the first and second embodiments, beans that are ejected from the pods due to the impact when the azuki beans are cut by the cutting blade and beans and pods that tend to fall under their own weight are easily sent to the cross-feed auger at the rear of the platform without falling below the platform due to the strong wind pressure of the air ejected from the tip 26b1' of the two branch pipes 26b' for each ridge. It was also confirmed that when adzuki beans are harvested in a field where weeds have grown, even if the beans and pods cut by the cutting blade 22 are blocked by the cut weeds from moving from the position of the cutting blade 22 toward the lateral feed auger at the rear of the platform, the strong wind pressure of the air spraying out from the tips 26b1' of the two branch pipes 26b' for each furrow makes it easy for the cut beans and pods to be sent to the lateral feed auger at the rear of the platform without falling below the platform. In addition, by using a large combine harvester, the adzuki beans grown in multiple rows could be harvested at once, significantly reducing the work time. This, combined with a significant improvement in the loss of harvest volume due to beans and pods falling off when harvesting, has resulted in extremely high harvesting efficiency.

[0064] According to the air ejection configuration adjustment structure 1 (1') for a large combine harvester of each embodiment of the present invention, a long hole portion 26a1-1' having a size that surrounds the connection portions of a large number of branch pipes 26b' that are connected at predetermined intervals and are formed in a portion 26a1' of the main pipe 26a' arranged parallel to the cutting blade 22', and a first male screw portion 26b2-1' provided at the end of each branch pipe 26b' on the connection side with the main pipe 26a' The main pipe 26a' is configured so that the spacing between the branch pipes 26b' connected to the main pipe 26a' can be adjusted, and the branch pipes 26b' connected to the main pipe 26a' can be adjusted. This makes it possible to prevent the branch pipes from colliding with the beans and pods just before harvesting, regardless of the sowing width of various rows. In addition, according to the air ejection shape adjustment structure 1(1') for a large combine harvester in each embodiment of the present invention, the approximately horizontal direction of the tip 26b1' of the branch pipe 26b' can be adjusted. Therefore, by attaching the branch pipes 26b' and adjusting the direction of the tip 26b1' so that air from the two branch pipes 26b' is ejected onto beans such as azuki beans sown and cultivated in one ridge, regardless of the sowing width, it is possible to reduce the falling of beans and pods when harvesting beans such as azuki beans, which is caused by the weight of the beans and pods when harvested, or the beans popping out of the pods due to the impact when they come into contact with the cutting blade or the tines of the scraping reel, and to send air so that the harvested beans such as azuki beans are more reliably sent to the cross-feed auger at the rear of the platform. As a result, it is possible to greatly reduce harvest loss. Also, by using a large combine harvester, it is possible to harvest large amounts of beans such as azuki beans at once, and the work time can be significantly shortened, resulting in extremely high harvesting efficiency.

[0065] In detail, according to the first embodiment of the air ejection form adjustment structure 1 for a large combine harvester, "the branch pipe connection unit 2 has an outer shape large enough to cover a part of the elongated hole 26a1-1' formed in the main pipe 26a', and has a pair of holes 2a1 formed in the longitudinal center with a predetermined size corresponding to the pipe diameter of the end 26b2' of the connection side of the branch pipe 26b', and further has a plurality of plate-like base members 2a with a predetermined interval of about 40 to 50 cm from the longitudinal center position to each longitudinal end edge, and a plurality of plate-like base members 2a rotatably inserted into each hole 2a1 formed in each plate-like base member 2a. The pair of annular members 2b are provided with a rotation amount adjustment portion 2b4 that is inseparably attached to the plate-shaped base member 2a and has a pair of first female screw portions 2b3 on its inner periphery and has an arc-shaped guide hole 2b4-1 formed at a predetermined position on a circle concentric with the rotation orbit on its upper edge portion, and the pair of annular members 2b are provided with a second female screw portion 2c1 provided on the orbit of the guide hole 2b4-1 of the rotation amount adjustment portion 2b4 of each of the annular members 2b in the plate-shaped base member 2a, a second male screw portion 2c2 that screws into the second female screw portion 2c1, and a head portion 2c3 provided at the base of the second male screw portion 2c2, and the rotation amount adjustment portion 2b4 is fixed to the plate-shaped base member 2a via the head portion 2c3. and an annular member fixing member 2c that fixes each annular member 2b to the plate-like base member 2a by tightening the annular member fixing member 2c. A plurality of branch pipe connection units 2, each having a first male screw portion 26b2-1' of a branch pipe 26b' screwed into a first female screw portion 2b3 of the annular member 2b so as to close the entire area of ​​an elongated hole portion 26a1-1' formed in the main pipe 26a', are overlapped such that the first female screw portions 2b3 of adjacent branch pipe connection units 2 are spaced apart at a desired interval, and the branch pipe connection units 2 are fixed to the main pipe 26a' via the branch pipe connection unit fixing member 3, thereby closing the entire area of ​​the elongated hole portion 26a1-1' formed in the main pipe 26a'. The arrangement interval between the branch pipes 26b' connected to the main pipe 26a' in a state where the pipe connection unit 2 is attached to the plate-like base member 2a can be adjusted to a desired interval including 50 cm and 67 cm, and the orientation of the tip ends 26b1' of the branch pipes 26b' connected to the main pipe 26a' in a state where the pipe connection unit 2 is attached to the plate-like base member 2a of adjacent branch pipe connection units 2 can be adjusted to a desired orientation in the approximately horizontal direction by rotating the rotation amount adjustment portion 2b4 in the branch pipe connection unit 2 by a desired amount and fixing the annular member 2b via the annular member fixing member 2c.Without re-drilling a hole in the main pipe 26a' to connect the branch pipe 26b', it is possible to prevent the branch pipe 26b' from colliding with the beans and pods immediately before harvesting, regardless of whether sowing is performed with various ridge widths including 50 cm and 67 cm, and at the same time, it is possible to reduce the falling of beans and pods when harvesting beans such as azuki beans due to the weight of the beans and pods when harvested, or the beans popping out of the pods due to the impact when they come into contact with the cutting blade or the tines of the raking reel, and to realize a configuration in which air from two branch pipes 26b' that send air is sprayed onto beans such as azuki beans sown and cultivated in one ridge so that the harvested beans such as azuki beans are more reliably sent to the lateral feed auger at the rear of the platform.

[0066] In addition, according to the first embodiment of the air ejection configuration adjustment structure 1 for a large combine harvester, the branch pipe connection unit 2 is provided with a pair of annular members 2b that are rotatably and non-detachably provided in each hole portion 2a1 formed in the plate-shaped base member 2a, have a pair of first female screw portions 2b3 on their inner circumference, and have a rotation amount adjustment portion 2b4 with an arc-shaped guide hole 2b4-1 formed at a predetermined position on a circle concentric with the rotating track on its upper edge portion.Therefore, when the first male screw portion 26b2-1' of the branch pipe 26b' is screwed into the first female screw portion 2b3 of the annular members 2b, the approximately horizontal orientation of the tip portion 26b1' of the branch pipe 26b' can be adjusted via the rotation amount adjustment portion 2b4, making it easier to prevent loosening of the attached branch pipe 26b'.

[0067] According to the second embodiment of the air ejection configuration adjustment structure 1' for a large combine harvester, "the branch pipe connection unit 2' has an outer shape large enough to close a part of the elongated hole 26a1-1' formed in the main pipe 26b', has a pair of first female screw portions 26b2-1' in the longitudinal center, and further has a plurality of plate-like base members 2a' having a predetermined interval of about 40 to 50 cm from the longitudinal middle position to each longitudinal end edge, and is fixed to the vicinity of the base of the first male screw portion 26b2-1' of each branch pipe 26b' and has a pair of first female screw portions 26b2-1' in the longitudinal center. a rotation amount adjustment member 2b' having an arc-shaped guide hole 2b1' formed at a predetermined position on a concentric circle with the rotation track of the branch pipe 26b' in which the first male screw portion 26b2-1' of the branch pipe 26b' screws into the first female screw portion 2a1'; a second female screw portion 2c1' provided on the track of the guide hole 2b1' of the rotation amount adjustment member 2b' fixed to the branch pipe 26b' in a plate-shaped base member 2a' in which the first male screw portion 26b2-1' of the branch pipe 26b' screws into the first female screw portion 2a1'; a second male screw portion 2c2' capable of screwing into the second female screw portion 2c1'; and a rotation amount adjustment member fixing member 2c' which fixes the rotation amount adjustment member 2b' to the plate-shaped base member 2a' by tightening the rotation amount adjustment member 2b' via the head 2c3'. A plurality of branch pipe connection units 2' are overlapped with each other so that the first female screw portions 2a1' of adjacent branch pipe connection units 2' are spaced apart at a desired interval so as to close the entire area of ​​the elongated hole portion 26a1-1' formed in the main pipe 26b', and the branch pipe connection units 2' are fixed to the main pipe 26b' via the branch pipe connection unit fixing member 3. By fixing the branch pipes 26b' to the plate-shaped base members 2a' of adjacent branch pipe connection units 2', the spacing between the branch pipes 26b' connected to the main pipe 26a' can be adjusted to a desired spacing, including 50 cm and 67 cm. When the first male screw portion 26b2-1' of the branch pipe 26b' is screwed into the first female screw portion 2a1' of the plate-shaped base member 2a', the rotation amount adjustment member 2b' in the branch pipe connection unit 2' is rotated a desired amount and the rotation amount adjustment member 2b' is fixed via the rotation amount adjustment member fixing member 2c'.By attaching the branch pipe connection units 2' to the plate-like base members 2a' of the adjacent branch pipe connection units 2', the orientation of the tip portions 26b1' of the branch pipes 26b' connected to the main pipe 26a' can be adjusted to a desired orientation in a substantially horizontal direction. Therefore, regardless of whether sowing is performed with various ridge widths including 50 cm and 67 cm, it is possible to adjust the orientation of the branch pipes 26b' so that the branch pipes 26b' do not collide with the beans and pods immediately before harvesting without having to re-open holes in the main pipe 26a' for connecting the branch pipes 26b'. At the same time, it is possible to reduce the falling of beans and pods when harvesting beans such as azuki beans, which is caused by the weight of the beans and pods themselves when harvested, or the beans popping out of the pods due to the impact of contact with the cutting blade or the tines of the raking reel, and to realize a configuration in which air from two branch pipes 26b' that feed air is sprayed onto beans such as azuki beans sown and cultivated in one furrow so that the harvested beans such as azuki beans are more reliably sent to the lateral feed auger at the rear of the platform.

[0068] In addition, according to the second embodiment of the air ejection configuration adjustment structure 1' for a large combine harvester, the branch pipe connection unit 2' is configured to include a plurality of plate-shaped base members 2a' having a pair of first female screw portions 2a1', a rotation amount adjustment member 2b' fixed near the base of the first male screw portion 26b2-1' of each branch pipe 26b' and having an arc-shaped guide hole 2b1' formed at a predetermined position on a concentric circle with the rotational orbit of the branch pipe 26b' in which the first male screw portion 26b2-1' screws into the first female screw portion 2a1', and a rotation amount adjustment member fixing member 2c', thereby simplifying the configuration for adjusting the approximately horizontal orientation of the tip portion 26b1' of the branch pipe 26b'.

[0069] In addition, according to the air ejection shape adjustment structure 1(1') for a large combine harvester of each embodiment of the present invention, each branch pipe connection unit 2(2') is configured so that the distance from the longitudinal center position of each plate-shaped base member 2a(2a') to each longitudinal edge portion is the same. Therefore, without re-drilling holes in the main piping for connecting the branch pipe 26b', it is possible to manufacture a large number of branch pipe connection units 2(2') of the same standard to prevent the branch pipes from colliding with the beans and pods just before harvesting, regardless of whether sowing is performed in various row widths including 50 cm and 67 cm, thereby reducing costs.

[0070] Furthermore, according to the air ejection shape adjustment structure 1(1') for a large combine in each embodiment of the present invention, it is configured to have multiple types of branch pipe connection units 2(2') with different distances from the longitudinal middle position of each plate-shaped base member 2a(2a') to each longitudinal edge portion, so that it is possible to accommodate sowing with a wider range of furrow widths and prevent the branch pipe 26b' from colliding with the beans and pods immediately before harvesting.

[0071] Further, in a large combine harvester equipped with a traveling section and a reaping section that reaps agricultural grains while being moved by the traveling section, the reaping section having a cutting blade, a raking reel, and an air blowing device, the air blowing device having a main pipe connected to a centrifugal type air blowing device and having a portion disposed substantially parallel to the cutting blade in front of and above the cutting blade, and a large number of elongated branch pipes that are connected at predetermined intervals to the portion of the main pipe disposed substantially parallel to the cutting blade, bent near the tip portion toward the cutting blade located rearward and below, and blow air in a substantially horizontal direction from the tip portion toward the cutting blade side, the large combine harvester according to each embodiment of the present invention By configuring the vine air ejection shape adjustment structure 1 (1'), it is possible to prevent the branch pipe 26b' from colliding with the beans and pods just before harvesting, regardless of the sowing width of the ridges, without having to re-drill a hole in the main pipe 26a' to connect the branch pipe 26b', and at the same time, it is possible to reduce the falling of beans and pods when harvesting beans such as azuki beans, which is caused by the weight of the beans and pods when harvested, or the beans popping out of the pods due to the impact when they come into contact with the cutting blade or the tines of the raking reel, and to feed air so that the harvested beans such as azuki beans are more reliably sent to the lateral feed auger at the rear of the platform. As a result, it is possible to greatly reduce the loss of the harvested amount. Moreover, it is possible to harvest a large amount of beans such as azuki beans at once, and the working time can be significantly shortened, so that the harvesting efficiency is extremely high.

[0072] Therefore, according to each embodiment of the present invention, in a large combine harvester equipped with a reaping unit for reaping agricultural grains, the reaping unit having a cutting blade, a raking reel, and an air ejection device, the air ejection device having a main pipe and a number of branch pipes each connected to the main pipe at a predetermined interval and ejecting air from its tip toward the cutting blade, regardless of whether seeds are sown with various furrow widths, the branch pipes are not caused to collide with the beans and pods immediately before reaping, and the weight of the beans and pods when reaped and the weight of the cutting blade and the raking reel are taken into consideration. This reduces the falling of beans and pods when harvesting beans such as azuki beans, which is caused by the beans popping out of the pods due to the impact when they come into contact with the tines of the harvester, and feeds air so that the harvested beans such as azuki beans are more reliably sent to the lateral feed auger at the rear of the platform, thereby making it possible to harvest a large amount of beans such as azuki beans at once while greatly reducing loss of harvest yield, and it is possible to obtain an air ejection shape adjustment structure for a large combine harvester and a large combine harvester equipped with the same, which has extremely high harvesting efficiency and can significantly shorten working time.

[0073] Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention.

[0074] For example, in the air ejection shape adjustment structure for large combines of the present invention and each embodiment, the distance from the longitudinal midpoint of the plate-shaped base member in each branch pipe connection unit to each longitudinal edge portion, and the distance from the longitudinal midpoint of the plate-shaped base member in each branch pipe connection unit to each longitudinal edge portion are approximately 40 to 50 cm, but the distance from the longitudinal midpoint of the plate-shaped base member in each branch pipe connection unit to each longitudinal edge portion is not limited to this numerical range. For example, in addition to the branch pipe connection unit provided in the air ejection configuration adjustment structure for a large combine harvester in each of the above-mentioned embodiments, another type of branch pipe connection unit may be provided separately, in which the minimum distance from the longitudinal center position of the plate-like base member to each longitudinal edge is 30 cm. In this way, it becomes possible to realize a harvest with extremely little loss in response to the development of a variety of beans such as adzuki beans with a ridge width shorter than 50 cm.

[0075] Furthermore, for example, in the air ejection shape adjustment structure for a large combine of the present invention and each embodiment, it is more preferable to configure it so that the height positions of the tips of the branch pipes connected to the main piping while attached to the plate-shaped base members of adjacent branch pipe connection units can be adjusted to a desired height. FIG. 12 is an explanatory diagram showing the configuration of an air ejection shape adjustment structure for a large combine harvester according to a modified example of the present invention, in which (a) is a side view of one branch pipe, (b) is a partially enlarged cross-sectional view of (a), and (c) is a diagram showing the state in which the spacing between multiple branch pipes connected to the main piping, and the horizontal direction and height position of the tip of each branch pipe are adjusted using the air ejection shape adjustment structure for a large combine harvester according to the modified example. In the air ejection mode adjusting structure 1" for a large combine harvester of this modified example, for example, as shown in Figures 12(a) and 12(b), the length of the first male screw portion 26b2-1" provided on the branch pipe 26b' is longer than the first male screw portion 26b2-1' of the branch pipe 26b' in the air ejection mode adjusting structure 1 for a large combine harvester of the first embodiment shown in Figures 1 to 7. By adjusting the amount of screwing of the first male screw portion 26b2-1" into the first female screw portion 2b3, for example, as shown in Figure 12(c), it is possible to vary the intervals between the multiple branch pipes 26b' connected to the main pipe 26a', the horizontal orientation of the tip portions 26b1' of each branch pipe 26b', and the height position of the tip portions 26b1' of each branch pipe 26b'. The other configurations are approximately the same as those of the air ejection mode adjusting structure 1 for a large combine harvester of the first embodiment.

[0076] The inventors of the present invention have also repeatedly considered and examined the possibility that, when the height positions of the tips 26b1' of the two branch pipes 26b' facing each other in one ridge are the same, a spatial region may occur in a part of the ridge where the carpet-like air jetted from both branch pipes 26b' collides and the wind pressure is offset and attenuated. They were concerned that, if such a spatial region occurs in a part of the ridge, a sufficient amount of air may not be jetted to the beans and pods of the harvested azuki beans, causing them to fall. However, according to the present modified air ejection configuration adjustment structure 1" for a large combine, by adjusting the amount of screwing of the first male screw portion 26b2-1" into the first female screw portion 2b3, the height positions of the tips 26b1' of the two branch pipes 26b' facing one ridge can be made different, thereby avoiding the collision of the carpet of air ejected from the two branch pipes 26b' facing one ridge and preventing the occurrence of a spatial region where the wind pressure is offset and attenuated. As a result, it is possible to prevent the beans and pods of harvested azuki beans from falling due to a lack of sufficient air being ejected therefrom, and further reducing the loss of harvest volume during harvesting.

[0077] In addition, in the air ejection configuration adjustment structure for a large combine of the present invention and each embodiment, the configuration for enabling the height positions of the tips of the branch pipes connected to the main pipe while attached to the plate-shaped base members of adjacent branch pipe connection units to be adjusted to the desired height may be a configuration in which, in the air ejection configuration adjustment structure for a large combine 1' of the second embodiment, a branch pipe 26b' of a different length is provided. [Industrial Applicability]

[0078] The air ejection configuration adjustment structure for a large combine harvester of the present invention and a large combine harvester equipped with the same are useful in fields where it is necessary to harvest beans such as adzuki beans that bear fruit at a height close to the ground. [Explanation of symbols]

[0079] 1, 1', 1" Air outlet shape adjustment structure for large combine harvesters 2, 2' Branch Pipe Connection Unit 2a, 2a' Plate-shaped base member 2a1 Hole 2b Annular member 2b1 Cylindrical section 2b2 Flange part 2b3, 2a1' First female screw part 2b4 Rotation amount adjustment part 2b4-1, 2b1' Arc-shaped guide hole 2b' Rotation amount adjustment member 2c Annular member fixing member 2c' Rotation amount adjustment member fixing member 2c1, 2c1' Second female screw part 2c2, 2c2' Second male screw part 2c3, 2c3' head 3 Branch pipe connection unit fixing member 3a Plate belt 3a1, 3a2 end 3b U-bolt 10 Running part 20, 20' reaping section 21 Platform 22, 22' cutting blade 23, 23' raking reel 23a Reel support arm 23b Reel spindle 23c Reel forming arm 23d connecting piece 23e Tine Bar 23f Tyne 24 Horizontal feed auger 24a Cylindrical member 24b Spiral member 24c Scraping Finger 25 Grass material 26' Air Jet 26a' Main piping 26a1': A portion disposed in front of and above the cutting blade 22' and approximately parallel to the cutting blade 22' 26a1-1' Long hole part 26b' Branch pipe 26b2' (connection end with main pipe 26a') 26b2-1', 26b2-1" First male thread 26b1' Tip 26c' centrifugal blower 30 Conveyor 31 Conveyor 40 Threshing Department 50 Sorting Department 60 Straw disposal unit

Claims

1. an air ejection pattern adjustment structure for a large combine harvester, the air ejection pattern adjustment structure being provided on a large combine harvester, the large combine harvester being equipped with a traveling section and a reaping section that reaps agricultural grains while being moved by the traveling section, the reaping section being equipped with a cutting blade, a raking reel, and an air ejection device, the air ejection device being connected to a centrifugal type blower device, a main pipe having a portion disposed substantially parallel to the cutting blade in front of and above the cutting blade, and a number of elongated branch pipes each connected at a predetermined interval to the portion of the main pipe disposed substantially parallel to the cutting blade, bending near its tip toward the cutting blade located rearward and below, and ejecting air from the tip in a substantially horizontal direction toward the cutting blade, a long hole portion formed in a portion of the main pipe arranged parallel to the cutting blade and having a size sufficient to surround connection portions of the multiple branch pipes connected at predetermined intervals; a first male screw portion provided at an end portion of each of the branch pipes on a connection side with the main pipe; a plurality of branch pipe connection units each including a pair of first female screw portions into which the first male screw portions can be screwed, the branch pipe connection units being capable of removably connecting the pair of branch pipes; a branch pipe connection unit fixing member for fixing each of the branch pipe connection units to the main pipe; having An air ejection configuration adjustment structure for a large combine harvester, characterized in that it is configured to enable adjustment of the spacing between each of the branch pipes connected to the main pipe and the approximately horizontal direction of the tips of the branch pipes.

2. The branch pipe connection unit includes: a plurality of plate-like base members each having an outer shape large enough to cover a portion of the elongated hole formed in the main pipe, a pair of holes formed in a longitudinal center portion with a predetermined size corresponding to the pipe diameter of the end portion of the connecting side of the branch pipe, and further having a predetermined interval of about 40 to 50 cm from a longitudinal center position to each longitudinal edge portion; a pair of annular members each provided in the hole formed in the plate-like base member so as to be rotatable and undetachable, the pair of first female screw portions being provided on the inner periphery thereof, and the pair of annular members each including a rotation amount adjustment portion having an arc-shaped guide hole formed at a predetermined position on a circle concentric with the rotation track on an upper edge thereof; an annular member fixing member having a second female screw portion provided on a track of the guide hole of the rotation amount adjustment portion of each of the annular members in the plate-like base member, a second male screw portion screwed into the second female screw portion, and a head portion provided at a base of the second male screw portion, and fixing the annular member to the plate-like base member by tightening the rotation amount adjustment portion via the head portion; having The branch pipe connection units, in which the first male screw portion of the branch pipe is screwed into the first female screw portion of the annular member so as to close the entire area of ​​the long hole portion formed in the main pipe, are stacked so that the first female screw portions of adjacent branch pipe connection units are spaced apart at a desired interval, and the branch pipe connection units are fixed to the main pipe via the branch pipe connection unit fixing member. This makes it possible to adjust the arrangement interval between the branch pipes connected to the main pipe in a state in which adjacent branch pipe connection units are attached to the plate-like base member to a desired interval including 50 cm and 67 cm, and by rotating the rotation amount adjustment portion in the branch pipe connection unit by a desired amount and fixing the annular member via the annular member fixing member, it is possible to adjust the orientation of the tip portions of the branch pipes connected to the main pipe in a state in which adjacent branch pipe connection units are attached to the plate-like base member to a desired orientation in a substantially horizontal direction.

2. The air ejection configuration adjustment structure for a large combine harvester according to claim 1.

3. The branch pipe connection unit includes: A plurality of plate-shaped base members each having an outer shape large enough to fill a portion of the long hole formed in the main pipe, each having a pair of the first female screw portions in a longitudinal center portion, and each having a predetermined interval of about 40 to 50 cm from a longitudinal middle position to each longitudinal edge portion; a rotation amount adjustment member fixed to the vicinity of a base of the first male screw portion of each of the branch pipes, the rotation amount adjustment member having an arc-shaped guide hole formed at a predetermined position on a circle concentric with a rotation track of the branch pipe in which the first male screw portion is screwed into the first female screw portion; a rotation amount adjustment member fixing member having a second female screw portion provided on a track of the guide hole of the rotation amount adjustment member fixed to the branch pipe in the plate-shaped base member where the first male screw portion of the branch pipe screws into the first female screw portion, a second male screw portion capable of screwing into the second female screw portion, and a head portion provided at a base of the second male screw portion, and fixing the rotation amount adjustment member to the plate-shaped base member by tightening the rotation amount adjustment member via the head portion; having The branch pipe connection units are overlapped such that the first female screw portions of adjacent branch pipe connection units are spaced apart at a desired interval so as to block the entire area of ​​the long hole portion formed in the main pipe, and the branch pipe connection units are fixed to the main pipe via the branch pipe connection unit fixing member. By attaching the branch pipe connection units to the plate-shaped base member of the adjacent branch pipe connection units, the arrangement interval between adjacent branch pipes connected to the main pipe can be adjusted to a desired interval including 50 cm and 67 cm. When the first male screw portion of the branch pipe is screwed into the first female screw portion of the plate-shaped base member, the rotation amount adjustment member in the branch pipe connection unit is rotated by a desired amount, and the rotation amount adjustment member is fixed via the rotation amount adjustment member fixing member. By attaching the branch pipe connection units to the plate-shaped base member of the adjacent branch pipe connection units, the orientation of the tip portions of the branch pipes connected to the main pipe can be adjusted to a desired orientation in a substantially horizontal direction.

2. The air ejection configuration adjustment structure for a large combine harvester according to claim 1.

4. An air ejection configuration adjustment structure for a large combine as described in claim 2 or 3, characterized in that each of the branch pipe connection units has the same distance from the longitudinal middle position of each of the plate-shaped base members to each of the longitudinal end edges.

5. An air ejection configuration adjustment structure for a large combine as described in claim 2 or 3, characterized in that it has multiple types of branch pipe connection units with different distances from the longitudinal intermediate position of each of the plate-shaped base members to each of the longitudinal end edges.

6. An air ejection configuration adjustment structure for a large combine as described in any one of claims 2 to 5, characterized in that the height positions of the tips of the branch pipes connected to the main pipe when attached to the plate-shaped base member of adjacent branch pipe connection units can be adjusted to a desired height.

7. a large combine harvester equipped with a traveling section and a cutting section that cuts agricultural grains while being moved by the traveling section, the cutting section having a cutting blade, a raking reel, and an air blowing device, the air blowing device being connected to a centrifugal type blowing device, a main pipe having a portion disposed substantially parallel to the cutting blade in front of and above the cutting blade, and a number of elongated branch pipes each connected at a predetermined interval to the portion of the main pipe disposed substantially parallel to the cutting blade, bending near the tip portion toward the cutting blade located rearward and below, and blowing air from the tip portion in a substantially horizontal direction toward the cutting blade; A large combine harvester comprising the air ejection configuration adjustment structure for a large combine harvester according to any one of claims 1 to 6.

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