combine

Abstract

To provide a combine harvester equipped with an inspection port on the right side of the grain tank 5 that is easy to open and close, and that allows for easy inspection, adjustment, and cleaning. [Solution] In a combine harvester in which the right side plate (51) of the grain tank (5) rotates upward to form an inspection opening (50), the long side of the side plate (51) is aligned in the front-to-back direction, a lock plate (53) that can rotate left-to-right is provided on one side of the side plate (51), the lock plate (53) forms an L-shaped elongated hole rail (57), the elongated hole rail (57) has a long side portion, a bent portion and a short side portion, a lock shaft is provided on the body of the grain tank (5), and when the side plate (51) is opened, the lock shaft passes through the long side portion of the elongated hole rail (57), and automatically enters the short side portion after passing the bent portion of the elongated hole rail (57), thereby restricting the side plate (51) from rotating in the closing direction.

Description

Technical Field

[0001] The present invention relates to a combine harvester.

Background Art

[0002] Conventionally, in a combine harvester, the opening and closing wall portion of the grain tank is provided so as to be openable and closable about a rotation axis extending vertically along the rear edge, and a configuration in which the right side surface of the grain tank is largely opened leaving the fixed wall portion is known (Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above-known example, since the opening and closing wall portion of the grain tank is opened horizontally by the long side, there is a problem that both an open space and a working space are required.

Means for Solving the Problems

[0005] The invention of claim 1 is a combine harvester in which the right side plate (51) of the grain tank (5) rotates upward to form an inspection opening (50), wherein the long side of the side plate (51) is aligned in the front-rear direction, a lock plate (53) that can rotate in the left-right direction is provided on one side of the side plate (51), the lock plate (53) forms an L-shaped elongated hole rail (57), the elongated hole rail (57) has a long side portion, a bent portion and a short side portion, a lock shaft is provided on the body of the grain tank (5), and when the side plate (51) is opened, the lock shaft passes through the long side portion of the elongated hole rail (57), and the lock shaft automatically enters the short side portion after passing over the bent portion of the elongated hole rail (57), thereby restricting the side plate (51) from rotating in the closing direction.

[0006] The invention of claim 2 is a combine harvester according to claim 1, characterized in that the side plate (51) is fixed so as to be able to be opened and closed by a snap lock (52) provided on the main body of the grain tank (5) and a lock hook (52A) provided on the lower edge of the side plate (51).

[0007] The invention of claim 3 is a combine harvester according to claim 1 or 2, characterized in that an opening and closing rotating arm (55) that can rotate in the left-right direction is provided on the other side surface of the side plate (51), and the opening and closing rotating arm (55) is fixed by inserting a stopper pin (56) into a hole provided in the grain tank (5). [Effects of the Invention]

[0008] The invention of claim 1 relates to a combine harvester in which the right side plate (51) of the grain tank (5) rotates upward to form an inspection opening (50), wherein the long side of the side plate (51) is aligned in the front-rear direction, a lock plate (53) that can rotate in the left-right direction is provided on one side of the side plate (51), the lock plate (53) forms an L-shaped elongated hole rail (57), the elongated hole rail (57) has a long side portion, a bent portion and a short side portion, a lock shaft is provided on the body of the grain tank (5), and when the side plate (51) is opened, the lock shaft passes through the long side portion of the elongated hole rail (57), and automatically enters the short side portion after passing over the bent portion of the elongated hole rail (57), thereby restricting the side plate (51) from rotating in the closing direction, so that the side plate (51) can be opened easily, and inspection and adjustment of internal shutters, sensors, etc. through the inspection opening (50) can be made easier and more reliable. Furthermore, it allows for faster emergency discharges.

[0009] In the invention of claim 2, in addition to the effects of the invention of claim 1, the side plate (51) is fixed so that it can be opened and closed by a snap lock (52) provided on the main body of the grain tank (5) and a lock hook (52A) provided on the lower edge of the side plate (51), so that the inspection opening (50) is closed by the side plate 51 and can be fixed so that it can be attached and detached and opened and closed by the snap lock 52.

[0010] By detecting grains using a non-contact grain sensor 12, it is possible to prevent the grains from cracking or discoloring due to contact with the grain sensor 12, thereby preventing a deterioration in grain quality.

[0011] In the invention of claim 3, in addition to the effects of the invention of claim 1 or 2, an opening and closing rotating arm (55) that can rotate in the left and right directions is provided on the other side surface of the side plate (51), The opening and closing rotating arm (55) and the stopper pin (56) are fixed by inserting them into holes provided in the grain tank (5), thereby shortening the time required to open the side plate (51) and improving work efficiency. [Brief explanation of the drawing]

[0012] [Figure 1] Plan view of the combine [Figure 2] Plan view and side view of the storage tank and the grain conveying path [Figure 3] Other embodiment diagrams [Figure 4] Other embodiment diagrams [Figure 5] Other embodiment diagrams [Figure 6] Other embodiment diagrams [Figure 7] Other embodiment diagrams [Figure 8] Side view of the rotary valve part [Figure 9] Operation state diagram in the rear view of another embodiment of the storage tank [Figure 10] Operation state diagram in the rear view of another embodiment [Figure 11] Side view of another embodiment [Figure 12] Side view of the storage tank [Figure 13] Perspective view of the storage tank with a part opened [Figure 14] Perspective view of another embodiment and side view of the opening / closing rotating arm and the stopper pin [Figure 15] Perspective view of another embodiment [Figure 16] Perspective view of another embodiment [Figure 17] Perspective view of another embodiment [Figure 18] (A) Conventional side view of the storage tank, (B) Side view of the storage tank of the present invention [Figure 19] Perspective view of another embodiment [Figure 20] Plan and side views of the operation (use) state of the cleaning port [Figure 21] Perspective view of the cleaning port [Figure 22] Plan and side views of the operation (use) state of another embodiment of the cleaning port

[0013] Perspective view of another embodiment [Modes for carrying out the invention]

[0014] One embodiment of the present invention will be explained with reference to the drawings. 1 is the machine frame of a work vehicle (combine harvester), 2 is the running gear located below the machine frame 1, 3 is a separation device (threshing device) located on one side above the machine frame 1, 4 is a harvesting device, 5 is a storage tank (grain tank) located to the side of the threshing device 3, 6 is the control unit, and 7 is a discharge auger that discharges the harvested material from the recovery device 5.

[0015] In a combine harvester comprising a traveling machine body, a harvesting device 4 for harvesting crops at the front of the machine body, a threshing device 3 for separating and sorting grain from the harvested stalks, a storage tank 5 for storing the threshed grain, and a control unit 6 on which an operator sits, a grain lifting cylinder 13 is provided to form a grain transport path 10 for transporting grain from the threshing device 3 to the storage tank 5. The discharge port 11 formed in the connecting trough 14 of the grain transport path 10 to the grain tank 5 is configured to be wide (fan-shaped in plan view, with a short vertical length), and one or more grain sensors 12 for detecting the passage of grain are arranged in the longitudinal direction of the discharge port 11, and the amount of grain is estimated and calculated from the detection position and detection time of the grain sensors 12 (Figure 2).

[0016] By making the discharge port 11 from the grain transport path 10 to the storage tank 5 wide, grain can be fed into the storage tank 5 over a wide area, making it less likely for grain to be fed into uneven locations and preventing the machine's weight balance from being disrupted.

[0017] By keeping the vertical length of the grains immediately before they are put into the storage tank 5 short, the grain sensor 12 can more easily detect the grains, reducing the difference between the actual yield and the detected yield, and improving the accuracy of yield detection.

[0018] Multiple grain sensors 12 are arranged above and below the discharge port 11 at predetermined intervals in the width direction. The grain sensors 12 are positioned so as not to overlap on the upper and lower sides, and the grain sensors 12 are configured to detect grain without contact with it (Figure 3).

[0019] In other words, the grain sensor 12 is a non-contact type sensor that does not come into contact with the grain.

[0020] By arranging the grain sensors 12 vertically, the density of the grain sensors 12 can be increased, reducing the amount of grain that is collected in the storage tank 5 without being detected, thereby improving the accuracy of yield measurement.

[0021] By detecting grains using a non-contact grain sensor 12, it is possible to prevent the grains from cracking or discoloring due to contact with the grain sensor 12, thereby preventing a deterioration in grain quality.

[0022] The grain sensor 12 is positioned on the upper inside of the discharge port 11, extending for approximately the same length as the internal width. A moisture content sensor 15, which calculates the moisture content by electrical resistance, is positioned on the lower inside of the discharge port 11, extending for approximately the same length as the internal width. The moisture content sensor 15 detects the moisture content, and the detected value of the grain sensor 12 is corrected (high moisture content → decrease correction, low moisture content → increase correction). The grain sensor 12 and the moisture content sensor 15 are configured to detect without contact with the grain (Figure 4).

[0023] By widening the placement range (detection range) of the grain sensor 12, the amount of grain collected in the storage tank 5 without being detected can be reduced, thereby improving the accuracy of yield measurement.

[0024] The moisture content sensor 15 detects the moisture content, and by applying an increase or decrease correction to the number of grains that would have been counted if they were densely clustered together due to moisture, the detection accuracy can be improved according to the working environment.

[0025] The grain sensor 12 and moisture sensor 15 detect grains in a non-contact manner, preventing the grains from cracking or discoloring due to contact, thus preventing a deterioration in grain quality. A grain chute 16 is provided inside the storage tank 5 to guide the grains that enter from the grain transport path 10 towards the discharge port 11 side of the storage tank 5 into the storage tank 5 on the outside of the machine, opposite the discharge port 11. The grain chute 16 is positioned closer to the inside of the machine than the discharge position (outer end of the machine). A partition plate 17, which is long in the downward direction, is arranged in the front-to-back direction within the storage tank 5. When the capacity of the storage tank 5 is small, the grain is stored between the outer wall 18 of the machine body and the partition plate 17, and when it exceeds the height of the partition plate 17, it is stored between the partition plate 17 and the inner wall 19 of the machine body of the storage tank 5. Below the storage plate 20, a discharge conveying path (discharge conveying spiral) 21 is provided to transport the grain to a discharge device (discharge auger) 7 that discharges the grain outside the machine (Figure 9).

[0026] At the start of storage, grain is stored closer to the outside of the machine, which reduces the imbalance caused by heavy objects (engine, battery, etc.) located on opposite sides of the machine. This minimizes disturbances in the harvesting posture and direction of travel, improving work efficiency and precision.

[0027] As the amount of grain recovered increases, the weight increases towards the inside of storage tank 5, that is, near the center of the aircraft in the left-right direction. This ensures that storage capacity is maintained while stabilizing the left-right balance of the aircraft.

[0028] Below the threshing device 3 and the storage tank 5, a battery mounting space 25 is formed in the left-right direction. Within the battery mounting space 25, a slide platform 27 is provided on which a battery 26 is mounted and which can move in the left-right direction. A pull spring 28 is provided at the outer end of the storage tank 5 to pull the slide platform 27. A grain elevator 30 is provided inside the storage tank 5 to receive grain and descend as the weight increases. The grain elevator 30 and the slide platform 27 are connected by a connecting wire 31. When the grain elevator 30 descends, the slide platform 27 moves towards the threshing device 3, and when the grain elevator 30 rises, the slide platform 27 moves towards the storage tank 5 due to the elasticity of the pull spring 28. At the bottom of the storage tank 5, a discharge conveying path (discharge conveying spiral) 21 is provided to transport grain to a discharge device (discharge auger) that discharges grain outside the machine. The battery mounting space 25 is formed behind the machine, beyond the discharge conveying path 21.

[0029] 31A is a pulley.

[0030] Before the battery 26 begins to be stored in the storage tank 5, the battery 26 is positioned on the outside of the machine body of the storage tank 5, which prevents the weight balance from shifting to the opposite side and stabilizes the working posture and direction of travel.

[0031] As the amount of stored grain increases, the battery 26 moves inward towards the inside of the machine, preventing the machine's balance from shifting towards the storage tank 5 even as the amount of stored grain increases, thus stabilizing the working posture and direction of travel.

[0032] By forming the battery mounting space 25 near the rear of the machine, the heavy objects placed at the front of the machine, such as the harvesting device 4, prevent an imbalance in the front-to-rear balance of the machine. This prevents the harvesting device 4 from coming into contact with the ground and being damaged, and prevents the cutting height at the harvesting position 4 from becoming excessively high, thus preventing tall stubble from being left behind that would affect the machine's movement.

[0033] The discharge port 11 (grain tank inlet) of the grain lifting cylinder 13 is made into a long, narrow shape, and multiple grain sensors 12 (proximity switches 35) are arranged in a row to measure the flow rate. The flow rate is calculated from the sensing time and detection range of the grain sensors 12 (proximity switches 35) (Figure 2).

[0034] Therefore, the grain sensor 12 can measure the harvest flow rate without contacting the grain.

[0035] The grain can be widely dispersed and introduced into the storage tank 5, and stored uniformly within the storage tank 5.

[0036] The grain sensors 12 are provided on both the upper and lower sides of the discharge port 11, and are arranged so that the upper grain sensor 12 and the lower grain sensor 12 do not overlap in an alternating manner in a plan view (Figure 3).

[0037] Therefore, the difference between the actual yield and the detected yield can be minimized, improving the accuracy of yield detection.

[0038] In the embodiment shown in Figure 6, a capacitance sensor 36 is positioned to measure the flow rate of the grains, and the flow rate is calculated from the change in capacitance as the grains pass through.

[0039] Therefore, the harvest flow rate can be measured non-contact using the grain sensor 12 (capacitive sensor 36).

[0040] It can be widely dispersed and stored uniformly within the storage tank 5.

[0041] The discharge port 11 of the grain transport path 10 (grain lifting cylinder 13) may be made elongated in the front-to-back direction, and a capacitance sensor 36 may be placed at the discharge port 11 to measure the flow rate. Alternatively, a moisture content sensor 15 may be installed at the discharge port 11, and the flow rate calculation may be corrected based on the moisture content value of the moisture content sensor 15.

[0042] Therefore, since the flow rate calculation is corrected based on the moisture content sensor 15, the difference between the actual yield and the detected yield can be further reduced, improving the accuracy of yield detection.

[0043] The outlet 11 of the grain transport path 10 (grain lifting tube 13) of the storage tank 5 is located at the top of the storage tank 5, and the grain is configured to free-fall from the grain lifting tube 13 into the storage tank 5 by a grain chute 16. A microwave flow sensor 40 is installed inside the storage tank 5 where the grain is free-falling (Figure 5).

[0044] Therefore, harvest flow rate can be measured without contact.

[0045] Figure 7 shows another embodiment, in which the discharge port 11 of the grain transport path 10 (grain lifting tube 13) of the storage tank 5 is located at the top of the storage tank 5, and the grain is allowed to free fall from the grain lifting tube 13 into the storage tank 5 by a grain chute 16, with a microwave flow sensor 40 provided on the lower surface of the grain chute 16 (Figure 7).

[0046] Therefore, harvest flow rate can be measured without contact.

[0047] A microwave flow sensor 40 is installed in the grain free-fall section of the grain discharge port 7a located at the end of the conveying section of the discharge auger 7. The flow rate is measured by detecting the grain falling into the collection container 39 using microwaves (Figure 11).

[0048] The grain discharge port 7a of the discharge auger 7 is located at the end of the conveying section of the discharge auger 7, and the auger discharge port 7a The grain is then discharged into an external recovery container (or flexible intermediate bulk container, etc.) 39 of the combine harvester's grain tank 5 (Figure 11).

[0049] Therefore, harvest flow rate can be measured without contact.

[0050] In a combine harvester equipped with an air grain 41, a microwave flow sensor 40 is provided at the outlet 43 of the rotary valve 42 (Figure 8).

[0051] Therefore, it is possible to measure the flow rate during discharge.

[0052] By integrating the rotary valve 42 and the flow sensor mounting section 45, a compact configuration can be achieved.

[0053] A large inspection port (cleaning port) 50 is provided on the right side of the grain tank 5 in the direction of travel (Figure 13). The inspection port 50 is closed by a side plate 51 and is fixed with a latch 52 so that it can be attached and detached and opened and closed.

[0054] In this case, the side plate 51 opens upward and is fixed to the main body of the grain tank 5 with the lock plate 53.

[0055] The snap lock 52 engages with the lock hook 52A provided on the inner wall 51 when closing the inner wall 51. It prevents it from opening by hooking it onto something.

[0056] The lock plate 53 is a plate member rotatably mounted on the rear side of the inner wall 51, forming an L-shaped elongated hole rail 57 into which a lock shaft, provided on the main body side of the grain tank 5, is inserted. When the inner wall 51 is opened, the lock shaft passes through the long side portion of the elongated hole rail 57, and when it is opened to its maximum extent, the lock shaft automatically moves into the short side portion beyond the bend of the elongated hole rail 57, restricting the inner wall 51 from rotating in the closing direction.

[0057] Conventionally, a configuration in which a small inspection port is provided inside the outer cover of the grain tank 5 when the outer cover is opened is known. In the conventional example, because it is a side-opening configuration, both opening and working space are required.

[0058] Because the side panel 51 of this invention has an upward-opening configuration, it is easy to open, which facilitates inspection and adjustment of the internal shutter, sensors, etc., and makes cleaning easier and more reliable. In addition, it allows for faster emergency discharge.

[0059] If a malfunction occurs that prevents the driving force from being transmitted to the grain discharge conveying system, such as a break in the transmission belt or the inability to engage the clutch in the discharge transmission system, the machine stops moving, and with a recovery container placed to the side of the grain tank 5, the side plate 51 is rotated upward to discharge the grain stored inside. The grain flows out to the outside through the space created by opening the side plate 51 due to its own weight, but any grain near the bottom of the grain tank 5 is manually scooped out by an operator and moved to the recovery container.

[0060] If grain is left in the grain tank 5, it may sprout and become impossible to mill normally, mold may grow and it may lose its commercial value, or pests may enter and damage it. Therefore, the side plate 51 is rotated upward to open the inspection port 50 and remove any remaining material from the grain tank 5.

[0061] Furthermore, when repairing a malfunction, if the grain has not been discharged, the grain tank 5 becomes heavy, making the repair work difficult.

[0062] The discharge conveying channel 21, located at the bottom of the grain tank 5, which moves the stored grain to the discharge auger 7, can become impassable if contaminants such as straw debris, which are transported along with the grain, accumulate. This can prevent the grain from falling into the discharge conveying channel 21, making transport impossible. In this case, the operator needs to open the side wall 51 and remove the contaminants from the discharge conveying channel 21.

[0063] Furthermore, if the discharge conveying path 21 becomes immobile due to a break in the transmission belt or other reasons, the side plate 51 may be opened and the stored grain may be removed manually. When the inner wall 51 is opened, some of the grain will come out, and unless it is removed from inside the grain tank 5, the load of the grain will prevent the transmission belt from being reattached, which is problematic.

[0064] A locking plate 53 is provided on the left side for automatic support, and a manually lockable opening and closing rotating arm 55 is provided on the right side.

[0065] Note that setting both the left and right sides to automatic will make it difficult to deactivate.

[0066] The opening and closing rotating arm 55 is an arm that spans the front of the body of the grain tank 5 and the inner wall 51, and does not lock even when the inner wall 51 is opened to its maximum extent. This is because, similar to the lock plate 53, if it were locked, it would be necessary to move it to release the locks on both the front and rear, which would take time to close, but since the inner wall 51 is long in the front-to-back direction, it would be difficult to release the locks on both the front and rear.

[0067] In other words, due to the length of the grain tank 5, the front and rear locks must be released separately, which requires the worker to move, thus reducing work efficiency. Furthermore, because the grain tank 5 is heavy, releasing one lock can cause a slight misalignment, making it difficult (heavier) to release the other lock later, further reducing work efficiency.

[0068] The opening and closing rotating arm 55 is an arm that spans the front side of the body of the grain tank 5 and the inner wall 51. When the inner wall 51 is rotated to its maximum extent to open, it does not have a function to lock into place, for example, it does not have a groove into which a locking pin can be inserted.

[0069] If the opening / closing rotating arm 55 is designed to lock when the inner wall 51 is opened, similar to the lock plate 53, then when closing the inner wall 51, it would be necessary to move it to release the locks on both the front and rear of the machine, which would add extra time to the closing process.

[0070] Since the inner wall 51 is long in the front-to-back direction of the machine, it is difficult for one worker to simultaneously release the locks on both the front and rear sides. Therefore, by locking only the rear lock plate 53 of the machine as in this configuration, the working time can be shortened and the work efficiency can be improved.

[0071] Since the inner wall 51 is a fairly heavy component, when it is left open for extended periods, such as during maintenance, the lock plate 53 alone may not provide sufficient support. Therefore, when the inner wall 51 is in the open position, the opening / closing rotating arm 55 and the hole in the grain tank 5 (not shown) By inserting the stopper pin 56, it becomes possible to lock the front and rear.

[0072] The automatic locking plate 53 provides rails 57 inside the grain tank 5 (Figure 16).

[0073] The lower tank cover 63 of the grain tank 5 has a hook portion 64 on its lower side, and a hook 66 is attached to the handle portion 65 for opening and closing the grain tank 5 (Figure 17).

[0074] The hooking portion 64 is an attachment portion equipped with a hook 66, and the handle portion 65, which is attached to the lower part of the inner wall 51, is hooked onto the hook 66.

[0075] The tank lower cover 63 has a shutter 68 on its lower right side (Figures 18 and 19). By opening or removing the shutter 68 without having to remove the entire lower cover 63, the grain tank 5 can be opened outwards around the pivot axis 5A by operating the open lever 69 on the grain tank 5.

[0076] Previously, as shown in Figure 18(A), the open lever 69 could not be operated without removing the tank lower cover 63. However, as shown in Figure 18(B), by opening the shutter 68, it can now be operated without removing the tank lower cover 63.

[0077] This eliminates the need to attach and detach the tank lower cover 63 when opening and closing the grain tank 5, thereby reducing working time.

[0078] A handle 73 is attached to the cleaning port 72, which is used to clean up rice grain and mud around the grain tank 5, to make it easier to remove (Figure 20).

[0079] The cleaning port 72 for cleaning up rice grain and mud around the grain tank 5 is fitted with a handle 73 to make it easy to remove, and is shaped like a dustpan so that it can be used as a dustpan.

[0080] The cleaning port 72 is designed to fit into the frame 75 and does not require fastening with bolts (Figure 19).

[0081] The cleaning port 72 is designed to fit into the frame 75 and has a deep, box-like shape (Figures 19 and 20). The cleaning port 72 can also be used as a mounting platform for a portable fuel can (not shown in the figure).

[0082] In the diagram, 75 is the frame, 76 is the mounting hole, 77 is the plate, 78 is the hinge, and 79 is the rib. [Explanation of symbols]

[0083] 1...Machine frame, 2...Traction mechanism, 3...Separation device, 4...Harvesting device, 5...Storage tank, 6...Control unit, 7...Discharge device, 10...Grain transport path, 11...Discharge port, 12...Grain sensor, 13...Grain lifting cylinder, 14...Connecting trough, 15...Moisture level sensor, 16...Grain chute, 17...Partition plate, 18...Machine outer wall, 19...Machine inner wall, 20...Storage plate, 21...Discharge transport path, 25...Battery mounting space, 26...Battery, 27...Slide platform, 28...Pulley, 30...Grain elevator, 31...Connecting wire, 31A...Pulley, 35...Near 36...Capacitive sensor, 40...Microwave flow sensor, 41...Air grain, 42...Rotary valve, 43...Outlet, 45...Flow sensor mounting section, 50...Inspection port, 51...Side plate, 52...Snap lock, 53...Lock plate, 55...Opening / closing rotating arm, 57...Rail, 63...Tank lower cover, 64...Hook, 65...Handle, 66...Hook, 68...Shutter, 69...Open lever, 72...Cleaning port, 73...Handle, 75...Frame, 76...Mounting hole, 77...Plate, 78...Hinge, 79...Rib.

Claims

1. In a combine harvester in which the right side plate (51) of the grain tank (5) rotates upward to form an inspection opening (50), The longer side of the side plate (51) is aligned in the front-to-back direction. A lock plate (53) that can rotate in the left-right direction is provided on one side of the side plate (51). The lock plate (53) forms an L-shaped elongated hole rail (57), The aforementioned elongated hole rail (57) has a long side portion, a bent portion, and a short side portion. A locking shaft is provided on the main body of the aforementioned grain tank (5). A combine harvester characterized in that, when the side plate (51) is opened, the locking shaft passes through the long side portion of the elongated hole rail (57), and the locking shaft automatically enters the short side portion beyond the bend of the elongated hole rail (57), thereby restricting the rotation of the side plate (51) in the closing direction.

2. The combine harvester according to claim 1, characterized in that the side plate (51) is fixed so as to be able to be opened and closed by a snap lock (52) provided on the main body of the grain tank (5) and a lock hook (52A) provided on the lower edge of the side plate (51).

3. An opening / closing rotating arm (55) that can rotate in the left-right direction is provided on the other side of the side plate (51). The combine harvester according to claim 1 or 2, characterized in that the opening and closing rotating arm (55) and the grain tank (5) are fixed by inserting a stopper pin (56) into a hole provided in the grain tank (5).

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