combine

Abstract

In a combine harvester equipped with a threshing depth control system that uses a tip sensor and a base sensor to detect the depth of the harvested crop being fed to the threshing section and controls the threshing depth adjustment motor to change the position of the threshing depth adjustment chain so that the depth is appropriate, when a detection failure is detected by the tip sensor, output to the threshing depth adjustment motor is stopped to prevent jamming of the straw discharge chain or cutter due to transport failure. However, since operation is stopped, the operator is required to check the grain stalk supply transport device and clear the error. Therefore, we provide a combine harvester that improves threshing accuracy by eliminating weeds and straw piles without stopping operation. [Solution] When the threshing depth sensor detects that the threshing depth is in a deep threshing state and the grain quantity sensor that detects the amount of grain in the threshing device detects that the amount of grain is below a predetermined level, the threshing depth adjustment drive device is driven to move the threshing depth adjustment device to the deeper threshing depth side.

Description

[Technical Field]

[0001] The present invention relates to a combine harvester equipped with a threshing device that threshes grain stalks harvested by a reaping device. [Background technology]

[0002] In combine harvesters equipped with threshing depth control, a threshing depth sensor consisting of an ear tip sensor and a plant base sensor detects the depth at which the harvested crop is fed to the threshing section, and controls a threshing depth adjustment motor to change the position of the threshing depth adjustment chain so that the depth is appropriate.When stalks break during wheat harvesting or harvested weeds become lodged in the inlet funnel, the ear tip sensor detects this and moves the adjustment chain to the shallower side, preventing the ears from being transported properly into the threshing drum.

[0003] Therefore, if the threshing goes too far to the shallow side, the transport posture becomes unstable, causing blockages in the straw discharge section and reducing threshing accuracy.

[0004] Therefore, there is a combine that automatically stops output to the handling depth adjustment motor when it detects a poor detection state of the tip sensor, preventing blockages in the straw discharge chain or cutter due to poor transport (see Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-176798 Summary of the Invention [Problem to be solved by the invention]

[0006] However, this would stop work, and the worker would have to check the straw supply and transport device and clear the error.

[0007] In view of the above, the present invention provides a combine harvester that eliminates weeds and straw piles without stopping operations, thereby improving threshing accuracy. [Means for solving the problem]

[0008] The invention described in claim 1 is a combine harvester that has a harvesting device 4 and a threshing device 3 on a body equipped with a traveling device 2, clamps and transports the harvested stalks by the harvesting device 4, and hands them over to a stalk supplying and conveying device 16 that supplies the stalks into the threshing device 3, and is equipped with a threshing depth adjusting device 15 that adjusts the position at which the stalks are clamped by the stalk supplying and conveying device 16, and automatically controls the threshing depth by driving a threshing depth adjustment drive device 20 that operates the threshing depth adjusting device 15 based on the detection of a threshing depth sensor S.When the threshing depth sensor S detects that the threshing depth is in a deep threshing state and a grain quantity sensor 50 that detects the amount of grain in the threshing device 3 detects that the amount of grain is below a predetermined amount, the threshing depth adjustment drive device 20 is driven to perform corrective control to move the threshing depth adjusting device 15 to the deeper threshing depth side.

[0009] According to the invention described in claim 1, it is possible to eliminate the situation where broken culms occur during wheat harvesting or where cut weeds remain in the inlet funnel of the threshing device 3, thereby improving threshing accuracy.

[0010] The invention described in claim 2 is the combine described in claim 1, in which correction control is not performed when the machine body is not moving forward.

[0011] The invention described in claim 3 is the combine harvester described in claim 1, in which correction control is not performed when the manual handling depth operating device 75 is operated.

[0012] The invention described in claim 4 is the combine harvester described in claim 1, in which correction control is not performed when the reaping device 4 and the stalk supplying and conveying device 16 are automatically stopped by other control. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a side view of a combine harvester according to an embodiment of the present invention. [Figure 2] 1 is a side view of a reaping device of a combine harvester according to an embodiment of the present invention. [Figure 3] 1 is a plan view of a reaping device of a combine harvester according to an embodiment of the present invention. [Figure 4] FIG. 2 is a side view of a tread depth adjustment means of a combine harvester according to an embodiment of the present invention. [Figure 5] FIG. 2 is a rear view of the tread depth adjustment means of the combine harvester according to the embodiment of the present invention. [Figure 6] FIG. 2 is a perspective view of the vicinity of a tread depth sensor of a combine harvester according to an embodiment of the present invention. [Figure 7] FIG. 2 is a side view for explaining the operation of the layer thickness sensor of the combine harvester according to the embodiment of the present invention. [Figure 8] 1 is a perspective view of a steering section of a combine harvester according to an embodiment of the present invention. FIG. [Figure 9] FIG. 2 is a control flow diagram of a combine harvester according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] A combine harvester as one embodiment of the harvester of the present invention will be described in detail below with reference to the drawings.

[0015] For ease of understanding, the description will be made for convenience, referring to the front as the front side, the rear as the rear side, the right hand side as the right side, and the left hand side as the left side, as seen from the operator's perspective, but the present invention is not limited to these.

[0016] As shown in Figure 1, 1 is the machine frame, 2 is a running device located below the machine frame 1, 3 is a threshing device located above the machine frame 1, 4 is a reaping device located in front of the machine frame 1, 5 is a grain tank located on the side of the threshing device 3 for temporarily storing grain removed from the threshing device 3, and 6 is a control unit.

[0017] To explain the configuration of the harvesting device 4 and its surroundings, as shown in Figures 1 to 3, 10 is the grass body, 11 is a lifting device, 12 is a cutting blade, 13 is a front conveying device, 14 is a rear conveying device, and 15 is a threshing depth adjustment device provided at the end of the conveying path transported by each of the above conveying devices, and at the end of the threshing depth adjustment device 15 is provided a stump supply conveying device (feed chain) 16 that supplies stumps to the threshing chamber (not shown) of the threshing device 3, and a handover conveying device 17 that takes over the stumps.

[0018] The stalk supplying and conveying device 16 supplies the stalks cut by the harvesting device 4 from the stalk supply port 18 of the threshing chamber of the threshing device 3 and conveys them until they are threshed and discharged from the stalk discharge port of the threshing chamber. However, the configuration for transporting the stalks cut by the harvesting device 4 to the stalk supplying and conveying device 16 is arbitrary and is not limited to the configuration of this embodiment. The starting end of the stalk supplying and conveying device 16 may face the end of the threshing depth adjustment device 15, and in the configuration of this embodiment, a handover conveying device 17 may be interposed between the threshing depth adjustment device 15 and the stalk supplying and conveying device 16.

[0019] As shown in Figures 4 to 6, the threshing depth adjustment device 15 changes the threshing depth by changing the clamping position of the stalks supplied to the stalk supply and conveyance device 16. In this embodiment, the base of the threshing depth adjustment device 15 is attached to the vertical support frame 19 of the harvesting device 4 so that the tip can move up and down. Reference numeral 20 denotes a threshing depth adjustment motor, 21 denotes a threshing depth adjustment means (threshing depth adjustment link) that moves the threshing depth adjustment device 15 using the threshing depth adjustment motor 20, 22 denotes a threshing depth position detection unit (potentiometer) that detects the actual threshing depth position of the threshing depth adjustment device 15, 23 denotes a tip sensor of the threshing depth sensor S, and 24 denotes a stalk base sensor. The appropriate threshing depth is when the tip is located midway between the stalk base sensor 24 and the tip sensor 23. When both the tip sensor 23 and the stalk base sensor 24 are off, the threshing state is shallow, and when both the tip sensor 23 and the stalk base sensor 24 are on, the threshing state is deep.

[0020] The reaping device 4 is provided with a front culm sensor 30 and a rear culm sensor 31 for detecting the culms to be reaped, and a long culm sensor 32 for detecting long culms.

[0021] As shown in Figure 7, the threshing device 3 has a threshing chamber 40 at the top where the stalks cut by the harvesting device 4 and transported by the stalk supply and transport device 16 are threshed.A threshing drum is mounted on a threshing drum shaft within the threshing chamber 40, and the lower side of the threshing drum is mainly surrounded by a threshing net 41.

[0022] Below the handling net 41 is a transfer shelf 43 at the start end of the swinging sorting shelf 42. A sieve 44 for separating grains from foreign matter is provided on the downstream side of the transfer shelf 43, and a straw rack 45 for transporting straw waste is provided on the downstream side of the sieve 44.

[0023] A winnower 46 is provided below the transfer shelf 43 of the oscillating sorting shelf 42, and the winnower 46 blows air toward the oscillating sorting shelf 42.

[0024] 47 is the first conveyor and 48 is the second conveyor.

[0025] At a predetermined position above the oscillating sorting shelf 42, a layer thickness sensor 50 that detects the layer thickness as a grain amount sensor that detects the amount of grains (material to be processed) on the oscillating sorting shelf 42 is provided at the center position on the left and right.

[0026] The layer thickness sensor 50 has a sensor body 51a located at the center left and right of an attachment stay 51 fixed to the left and right machine frames of the threshing device 3, and a detection arm 51b, whose base is rotatably attached to the sensor body 51a, extends toward the oscillating sorting shelf 42, and the detection arm 51b is rotatable upward from its initial angle.

[0027] The layer thickness sensor 50 has a detection arm 51b that rotates upward from an initial angle depending on the layer thickness of grains on the oscillating sorting shelf 42, and the sensor body 51a sends a detection voltage to the control device 60 according to the rotation angle.

[0028] That is, when the layer thickness of the grains on the oscillating sorting shelf 42 is thin (the amount of grains is small), the layer thickness sensor 50 sends a low detection voltage to the control device 60, and as the layer thickness increases (the amount of grains increases), it sends a high detection voltage.Based on the detection voltage from the layer thickness sensor 50, the control device 60 calculates the layer thickness of the grains on the oscillating sorting shelf 42 and determines the layer thickness in eight stages.

[0029] As shown in Figure 8, the operating unit 6 is equipped with a threshing depth switch 70 that turns the threshing depth control on and off, a threshing lever position sensor 72 that detects the operating position of a threshing lever 71 that turns the drive of the threshing device 3 and the reaping device 4 on and off, a reverse sensor 74 that detects the reverse operation of the main shift lever 73, a threshing depth manual switch 75 as a threshing depth manual operating device that manually operates the threshing depth, a monitor 76, etc.

[0030] Here, the automatic control of the treatment depth will be described with reference to the control flow diagram of FIG.

[0031] During harvesting work in the field, the threshing depth switch 70 is turned on to activate threshing depth control, the threshing lever 71 is operated to turn on the drive of the threshing device 3 and the reaping device 4, the threshing lever position sensor 72 detects the drive-on operation, the front stalk sensor 30 and rear stalk sensor 31 of the reaping device 4 detect stalks and turn on, and the reverse sensor 74 does not detect the reverse operation of the main shift lever 73 (the machine is moving forward), and based on this information, the control device 60 performs the automatic threshing depth control (S1) described below.

[0032] The automatic threshing depth control automatically controls the tip position of the threshing depth adjustment device 15 using the threshing depth adjustment motor 20 so as to keep the tip position constant according to the entire length of the stalk.The threshing depth adjustment by the threshing depth adjustment device 15 is performed by automatically driving the threshing depth adjustment motor 20, which operates the threshing depth adjustment device 15, based on the detection results of the tip position of the stalk by the tip sensor 23 and base sensor 24 of the threshing depth sensor S, which are arranged at intervals in the stalk direction of the stalk being transported.

[0033] In other words, when the tip of the stalk is in the middle position between the base sensor 24 and the tip sensor 23 of the threshing depth sensor S, and the base sensor 24 is on and the tip sensor 23 is off, the threshing depth is appropriate, and the control device 60 does not output control for automatic threshing depth control.

[0034] When both the tip sensor 23 and the base sensor 24 are off, the threshing state is shallow, and the control device 60 controls the threshing depth adjustment motor 20 to move the threshing depth adjustment device 15 in the direction of increasing the threshing depth until the appropriate threshing depth is reached.

[0035] When both the tip sensor 23 and the base sensor 24 are on, the threshing state is reached, and the control device 60 controls the threshing depth adjustment motor 20 to move the threshing depth adjustment device 15 in the direction of shallower threshing depth until the appropriate threshing depth is reached.

[0036] However, when wheat stalks are broken during harvesting or cut weeds become lodged in the inlet funnel of the threshing device 3, the ear tip sensor 23 detects this and turns on, causing the threshing depth adjustment device 15 to move to the shallower side, preventing the ears from being transported properly into the threshing device 3.

[0037] Therefore, if the threshing goes too far to the shallow side, the transport posture becomes unstable, causing blockages in the straw discharge section and reducing threshing accuracy.

[0038] Therefore, in this embodiment, in order to solve the above problem, the following correction control is performed.

[0039] If the long culm sensor 32 is off and the culm is not a long culm (S2), the ear tip sensor 23 and the base sensor 24 of the threshing depth sensor S are both on for a predetermined time (more than 2 seconds) and the threshing depth is detected to be deep (S3), the layer thickness detected by the layer thickness sensor 50 decreases below a predetermined level (below two stages) (detecting a grain amount below a predetermined level) (S4), the reverse sensor 74 is in a forward operating position that does not detect reverse operation of the main shift lever 73 (S5), the threshing depth manual switch 75 is off (S6), and the automatic stop of the reaping device 4 and the stump supply and conveying device 16 is not activated (S7), the threshing depth adjustment motor 20 moves the threshing depth adjustment device 15 in the direction that deepens the threshing depth (S8), and the monitor 76 of the control unit 6 displays that correction control is being performed (S9).

[0040] The above correction control allows the stalks to be transported normally into the threshing device 3, eliminating the problem of broken stalks during wheat harvesting and the situation where cut weeds remain in the inlet funnel of the threshing device 3, thereby improving threshing accuracy.

[0041] Although the above-described embodiment has been described as the best mode, not all steps are essential, and steps S2 and S5 to S7 may be omitted as appropriate. [Explanation of symbols]

[0042] 2 Running gear 3 Threshing equipment 4 Reaping device 15 Handling depth adjustment device 16 Grain straw supply and conveying device 20. Depth adjustment drive unit (depth adjustment motor) 50 Grain quantity sensor (layer thickness sensor) 75 Manual operating device for depth of operation (manual switch for depth of operation) S Depth Sensor

Claims

1. A combine harvester is provided with a reaping device (4) and a threshing device (3) on a machine body equipped with a traveling device (2), and the reaping device (4) clamps and transports the reaped stalks, which are then transferred to a stalk supplying and conveying device (16) that supplies the stalks into the threshing device (3). A threshing depth adjusting device (15) is provided to adjust the position at which the stalks are clamped by the stalk supplying and conveying device (16). The threshing depth is automatically controlled by driving a threshing depth adjusting drive device (20) that operates the threshing depth adjusting device (15) based on the detection of a threshing depth sensor (S). When the threshing depth sensor (S) detects that the threshing depth is in a deep threshing state and a grain amount sensor (50) that detects the amount of grain in the threshing device (3) detects that the amount of grain is below a predetermined value, the threshing depth adjusting drive device (20) is driven to perform correction control to move the threshing depth adjusting device (15) to the deeper threshing depth.

2. 2. The combine harvester according to claim 1, wherein the corrective control is not performed when the machine body is not moving forward.

3. 2. The combine harvester according to claim 1, wherein correction control is not performed when the manual operating device (75) for adjusting the cutting depth is operated.

4. 2. The combine harvester according to claim 1, wherein the corrective control is not performed when the reaping device (4) and the stalk supplying and conveying device (16) are automatically stopped by other control.

Images