JP2003052228A - Grain culms-conveying apparatus of combine harvester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grain culms-conveying apparatus of a combine harvester with which a variable speed transmission for pretreatment driving is protected from excessive pressure due to blockage of grain culms. SOLUTION: In this grain culms-conveying apparatus of the combine harvester controlled so that a relationship between a traveling speed of the combine harvester and a conveying speed of grain culms in the pre-treating part becomes a proportional relation, a controller 85 is provided. When conveying speed of the grain culms in the pre-treating part is lowered by a predetermined ratio or larger than the proportional relation after the conveying speed of grain culms in the pre-treating part becomes a relation which is proportional to the traveling speed of the combine harvester, the controller 85 controls so as to stop the conveyance of grain culms in the pre-treating part. The controller 85 prevents excessive pressure to a variable speed transmission for driving the pre-treating part to enable protection of the variable speed transmission.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combine grain culm transporting device for transporting grain stalks cut by a pretreatment section toward a threshing section.

[0002]

2. Description of the Related Art In a combine harvester, grain cutting and threshing of grain culm are performed at the same time. Therefore, a grain reaping unit and a conveying unit are provided in a pretreatment unit, and the grain culm cut by the cutting unit is conveyed to a conveying unit (scraping device, It is designed to be sequentially fed into the feed chain of the threshing section by a saw depth conveying device). The transport section is provided with a saw depth main sensor that detects a cut grain culm, a stock source sensor and a tip sensor that detect the tip of the cut grain culm, and a detection output of the saw depth main sensor. Based on this, the stock origin sensor and the tip sensor are operated to detect the tip of the cut grain culm, and the passing position of the tip of the grain culm with respect to the saw barrel is controlled to perform depth control.

Further, in the combine, the pretreatment section has a speed proportional to the rotation speed of the main transmission (HST) of the transmission, that is, the traveling speed of the combine has a proportional relationship with the grain transfer speed in the pretreatment section. Is controlled.

[0004]

In such a combine, when the transfer of the pretreatment section is clogged with grain culms,
The transportation speed of the grain culms in the transportation unit decreases, and an excessive force acts on the pretreatment drive continuously variable transmission. A detection switch for detecting clogging of grain culms is arranged in the transport section of the pre-processing section, and when the grain culm is clogged in the transport section, traveling of the combine is stopped. Further, a relief valve is provided in the pretreatment drive continuously variable transmission to prevent an increase in pressure, thereby protecting the pretreatment drive continuously variable transmission.

In view of the above circumstances, the present invention detects a change in the grain culm conveying speed in the conveying section of the pretreatment section which is proportionally controlled with respect to the traveling speed of the combine, or the grain culm at the time of starting the combine. Detects changes in transport speed,
To provide a combine grain culm transport device capable of protecting a continuously variable transmission for pretreatment drive by detecting clogging of grain culm in the pretreatment unit and stopping transportation of the grain culm in the pretreatment unit. With the goal.

[0006]

In order to achieve the above object, the first aspect of the present invention provides a power source (13) and an output of the power source (13) transmitted to a crawler traveling device (11). And a drive chain continuously variable transmission (60) for driving the combine (10), and the feed chain (46) of the preprocessing section (16) and the threshing section (45) with the output of the power source (13).
A continuous transmission (72) for driving pretreatment for cutting and transporting the grain culms to the traveling speed of the combine (10) and the grain culm in the pretreatment unit (16). In a combine grain and culm transport device configured to control the transport speed in a proportional relationship, after the grain culm transport speed in the pretreatment unit (16) becomes in a proportional relationship with the traveling speed of the combine (10), A control device (85) for stopping the transportation of the grain culms in the pretreatment unit (16) when the transportation speed of the grain culm in the pretreatment unit (16) is lower than the proportional relationship by a predetermined ratio or more. It is provided in a combine grain culm transporting device.

A second aspect of the present invention provides a power source (1
3) and an output of the power source (13) to the crawler traveling device (11) to drive the combine (10) to travel continuously variable transmission (60), and the power source (13).
And a continuously variable transmission (72) for driving pretreatment for transmitting the output of the above to the feed chain (46) of the pretreatment section (16) and the threshing section (45) to perform harvesting and transportation of grain culms. ,
The traveling speed of the combine (10) and the pretreatment unit (1
6) In the combine grain culm transporting device in which the transport speed of the grain culm in 6) is controlled in a proportional relationship, the power source (13) is started and the continuously variable transmission (72) for pretreatment drive is stopped. After that, the continuously variable transmission (7
A control device (85) for stopping the transportation of the grain culms in the pretreatment unit (16) when the rotation speed does not increase even if the output shaft is accelerated in 2). It is a combine grain culm conveying device characterized by.

The numbers in parentheses are for convenience of showing the corresponding elements in the drawings, and the present description is not limited to the description in the drawings.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 is a cross-sectional side view of a combine implementing the present invention, FIG. 2 is a drive system diagram of the combine shown in FIG. 1, FIG. 3 is a control system diagram of the combine in FIG.
FIG. 4 is a flowchart showing the process of grain culm transport control.

In FIG. 1, a combine 10 has a body 12 supported by a pair of left and right crawler traveling devices 11, 11. Front part of this fuselage 12 (left side of Fig. 1)
An engine 13 is mounted on either the left or right side of the. A driver's seat 15 is arranged above the engine 13.

The front of the machine body 12 (left side in FIG. 1)
A pre-processing unit 16 for cutting grain culms is supported by the vertically movable unit. Further, a threshing unit 45 for threshing the cut grain culms and selecting the threshed grains is arranged on the other side of the front portion of the machine body 12 on the other side.

And, the crawler traveling devices 11, 1
1, the pretreatment unit 16 and the threshing unit 45, the engine 13
The combine 10 is driven, and the grain culm is mowed and threshing is performed.

The pretreatment section 16 directs the raising device 26 for raising the laid grain culm, the scraping device 31 for scraping the cut grain culm, and the cut grain culm to the threshing unit 45. A transporting device 36 for transporting and adjusting the position of the grain culm is provided, and its operation base end side is rotatably supported by a transmission shaft case 17 arranged in front of the machine body 12.

A transmission case 19 extending from the transmission shaft case 17 to the machine body 12 obliquely downward and forward of the machine body 12 is transmitted by expansion and contraction of a hydraulic cylinder 20 arranged at an intermediate position in the longitudinal direction. It swings around the shaft case 17. The transmission shaft case 17 is provided with a lift potentiometer 21 that detects the amount of rotation of the transmission case 19.

Below the transmission case 19, a transmission shaft cylinder extending in the left-right direction of the machine body 12 (front-back direction in the plane of FIG. 1) and orthogonal to the transmission case 19 in a substantially T-shape. 22 are integrally connected. This transmission shaft cylinder 22
A plurality of dividers 25 are integrally connected to the vehicle body 12 via a pretreatment frame 23 extending toward the front of the machine body 12 so as to weed the uncut grain culms, raise them, and guide them to the passage.

Further, below the dividers 25 at the left and right ends, there are directional sensors (not shown) which enable the combine 10 to run automatically. Behind the divider 25, the raising device 26 that raises the culms that have been weeded is provided in an inclined shape that rises from the front of the pretreatment unit 16 toward the rear.

The raising device 26 includes a chain 27 with a claw.
And a plurality of pawls are attached to the chain 27 with pawls at predetermined intervals, and these pawls are raised to rotate upward in the case 29 to scoop up the grain culm. The claw chain 27 is driven by a drive system described later.

A cutting blade 30 is provided behind the raising device 26 and at the lower front portion of the transmission shaft cylinder 22 so as to be close to the ground and cut the root of the grain stem. The grain culm cut by the cutting blade 30 is scraped by the scraping device 31 and transferred to the rear.

The scraping device 31 includes a conveyor belt 32.
And the stock carrier transport star wheel 33, the stock carrier chain 35, etc., and the grain culms cut by the cutting blade 30 are scraped by the carrier belt 32 and the stock carrier star wheel 33 and moved to the respective paths. It is then clamped by the stock carrier transport chain 35 and taken over by the saw depth transport device 36 arranged behind the scraping device 31.

The saw depth conveying device 36 has a rear portion rotatably supported around the transmission shaft case 17 so that the saw depth can be adjusted, and conveys the tip side of the grain stem. It is provided with a tip transport chain 37 and a stock carrier chain 39 for carrying the stock side. The tip transport chain 37 and the stock carrier transport chain 39 are vertically movable integrally with the rear part as a fulcrum (in the direction of the arrow in the figure), and the starting end side thereof is the stock source of the scraping device 31. It extends above the terminal end of the transport chain 35 in the transport direction.

U attached to the saw depth conveying device 36
The pipe section 40 is provided with a saw depth main sensor 41 as a first detection means for detecting the presence or absence of grain culms during transportation. The saw depth main sensor 41 uses, for example, an on / off switch to detect the presence or absence of a grain culm during transportation. In addition, the U pipe portion 40 has a second
Stock sensor 42 and tip sensor 43 as detection means for
It is equipped with a stock source and tip sensor. This stock origin / tip sensor detects the position of the tip of the grain culvert which is passed from the scraping device 31 to the saw depth conveying device 36.

In the threshing section 45, the feed chain 4
6 and the feed chamber 46 substantially parallel to the feed chamber 4
7, a saw cylinder 49 is rotatably disposed in the saw chamber 47 about a rotation axis extending in the front-rear direction of the machine body 12. Below the saw cylinder 49, a receiving net 50 for leaking threshered grains is provided, and below the receiving net 50, a swing selecting section 51 is arranged so as to be swingable back and forth. ing.

[0023] Then, due to the swinging action of the swing selecting section 51 and the sorting wind generated from the Karaji 52 and the suction fan 53, the grains mixed with the sprouts are sorted. The grains selected by the swing selection unit 51 are the No. 1 gutter 55 or 2 arranged below.
It is dropped and stored in the gutter 56. The grain culms that have been threshed by the saw cylinder 49 in the saw chamber 47 are taken over from the feed chain 46 to the culm chain 57 provided at the rear of the machine body 12 for processing.

The drive system of the combine 10 using the engine 13 (E / G) as a power source is constructed as shown in FIG. A transmission 59 (T / M) that constitutes a traveling drive system of the combine 10 is provided with an HST 60 that constitutes a main transmission, an auxiliary transmission 61 and a gear train 62, and drives the crawler traveling device 11. Engine 13
From the HST 60 to the HST 60, a belt 63 that is stretched between a pulley 13 b fixed to the output shaft 13 a of the engine 13 and a pulley 60 b fixed to the input shaft 60 a of the HST 60.
Transmission of power is carried out.

The drive shaft 65 is rotatably supported at a predetermined position of the combine 10. From the engine 13 to the drive shaft 65, a pulley 13c fixed to the output shaft 13a of the engine 13 and a pulley 65a fixed to the drive shaft 65.
Power is transmitted by the belt 66 that is stretched between the two. A work machine clutch 67 (tension clutch) is arranged on the belt 66.

The intermediate shaft 69 is rotatably supported at a predetermined position of the combine 10. From the drive shaft 65 to the intermediate shaft 69, a bevel gear 65b fixed to one end of the drive shaft 65.
Then, power is transmitted by the bevel gear 69a fixed to the intermediate shaft 69 so as to mesh with the bevel gear 65b.

From the intermediate shaft 69 to the saw cylinder 49, the intermediate shaft 6
Power is transmitted by a belt 70 that is stretched between a pulley 69b fixed to one end of the shaft 9 and a pulley 49b fixed to one end of an input shaft 49a of the saw cylinder 49. Therefore, the saw cylinder 49 is always rotating when the work clutch 67 is in the ON state.

The pretreatment transmission 71 comprises an HST 72 which constitutes a pretreatment drive continuously variable transmission. Drive shaft 65
From the HST 72 to the pulley 6 fixed to the drive shaft 65
Power is transmitted by a belt 73 that is stretched between 5c and a pulley 72b fixed to an input shaft 72a of the HST 72. The HST 72 has an HST drive motor 75.

The HST 72 has a T / M proportional mode in which the output shaft 71c of the pretreatment transmission 71 rotates in proportion to the rotation of the HST 60, and an E / M in which the output shaft 71c rotates in proportion to the rotational speed of the engine 13. The pre-processing unit 16 and the feed chain 46 of the threshing unit 45 are driven by rotating in the G proportional mode.

The pretreatment drive shaft 76 is rotatably supported at a predetermined position of the combine 10. From the pretreatment transmission 71 to the pretreatment drive shaft 76, it is bridged between a pulley 71d fixed to the output shaft 71c of the pretreatment transmission 71 and a pulley 76a fixed to the pretreatment drive shaft 76. The power is transmitted by the belt 77. A reaping clutch 79 (tension clutch) is arranged on the belt 77, and is configured to stop the pretreatment unit 16 while the threshing unit 45 is being driven, thereby enabling a handcuffing operation.

The pretreatment drive shaft 76 is a bevel gear 76b.
Via the bevel gear 37a that meshes with the bevel gear 76b.
Drive 9

The transmission shaft 80 is rotatably supported at a predetermined position of the combine 10. The pretreatment drive shaft 76
Power is transmitted to the transmission shaft 80 from the bevel gear 76c fixed to the pretreatment drive shaft 76 and the bevel gear 80a fixed to the transmission shaft 80 so as to mesh with the bevel gear 76c.

The transmission shaft 80 drives the cutting blade 30 and also via the gear 32a meshing with the gear 80b fixed to the transmission shaft 80 and the gear 32b meshing with the gear 32a, the conveyor belt 32 of the scraping device 31. To drive.

The drive shaft 81 is rotatably supported at a predetermined position of the combine 10. The pretreatment transmission 7
From the output shaft 71c of No. 1 to the drive shaft 81. Chain 8
2, the transmission of power is performed. And the drive shaft 8
The feed chain 46 is driven by the sprocket 81b fixed to 1.

The control device 85 of the combine 10 is constructed as shown in FIG. That is, the control device 85 includes an input interface 86, a microcomputer 87, and an output interface 89, and is connected to the main switch 90 of the combine 10.

The input interface 86 includes a lift potentiometer 21, a lift raising switch 91, a working machine clutch switch 92, and a cutting clutch switch 9.
3, main saw depth sensor 41, lift shut switch 94, hand switch 95, back switch 96, T
The / M rotation sensor 97, the HST rotation sensor 98, the engine rotation sensor 99, etc. are connected.

The lift raising switch 91 raises the pretreatment unit 16 when turned on. By continuously turning on the lift raising switch 91, the pretreatment unit 1
6 continuously rises.

The working machine clutch switch 92 is provided on a working clutch lever (not shown), and the combine 1
The work machine clutch 67 is switched so that the driving of 0 and the driving of the pretreatment unit 16 and the threshing unit 45 are interlocked or separated.

The reaping clutch switch 93 is provided on a reaping clutch lever (not shown), and the preprocessing unit 1
6 and the drive of the threshing unit 45 are switched so as to interlock or separate the cutting clutch 79. The lift raising switch 91 is arranged on an operation panel (not shown) and raises the pretreatment unit 16.

When the handhold switch 95 is turned on, the running speed of the combine 10 and the pretreatment transmission 71 are released from each other, and the handhold lamp 102 described later is turned on.
When turned off, the traveling speed of the combine 10 and the pretreatment transmission 71 are interlocked, and the handhold lamp 102 is turned off. The hand-pitch switch 95 may be arranged on the operation panel (not shown) or may be arranged near the saw chamber 47.

The back switch 96 is arranged on the main shift operation lever (not shown) of the HST 60, and the combine 10
Select the traveling direction of. T / M (Transmission)
The rotation sensor 97 is provided on the output shaft of the traveling HST 60 and detects the rotation thereof as the traveling speed of the combine 10. The HST rotation sensor 98 is provided on the output shaft of the HST 72, and detects the rotation of the HST rotation sensor 98 as the transport speed of the grain culms in the pretreatment unit. The engine rotation sensor 99 counts the number of alternator pulses and detects the rotation of the engine 13.

Further, the output interface 89 is provided with a horn 101, a hand-operated lamp 102, and an HS for pretreatment conveyance.
The T drive motor 75 and the E / G stop solenoid 103 are connected.

In the combine 10 having such a structure, after the combine 10 is put in the field, the combine 10 is moved forward in the direction in which the grains are arranged. Then, the divider 25 enters into the array of grain culms, and the chains 27 with claws raise the grain culms. The culm is cut (cut) by the cutting blade 30.

The harvested grain culm is conveyed by the conveyor belt 32 to the saw depth conveying device 36, and the saw depth conveying device 36 is conveyed.
Passed to. While being conveyed toward the feed chain 46 by the saw depth conveying device 36, the grain culm is detected by the saw depth main sensor 41, and at the same time, the stock origin sensor 42 and the tip sensor 43 detect the tip of the grain culm. The position is detected. Then, based on the detection result, the position of the grain culm is adjusted by the saw depth transport device 36 so that the grain culm tip is located between the stock sensor 42 and the tip sensor 43.

The grain culm is transferred from the saw depth conveying device 36 to the feed chain 46. Then, the grain culm is conveyed by the feed chain 46 so that the tips thereof pass through the inside of the saw chamber 47, and is threshed by contact with the saw drum 49. The grain culm conveyed to the end of the feed chain 46 is transferred to the culm chain 57, and the culm chain 5
At 7, the waste is discarded outside the combine 10.

The grains threshed from the culms fall on the receiving net 50, and further pass through the receiving net 50 and are collected on the rocking / sorting section 51. Then, due to the swinging action of the swing selecting section 51 and the sorting wind generated from the Karako 52 and the suction fan 53,
Separated from the culm. The grain selected by the swing selection unit 51 is dropped and stored in the first gutter 55 or the second gutter 56 arranged below.

The control device 85 of the combine 10 as described above.
The transfer control of the grain culm in 1 is described with reference to the flowchart shown in FIG.

During operation of the combine 10, which is performing a normal mowing operation, the rotation speed of the output shaft of the HST 60 is read as the traveling speed of the combine 10 from the T / M rotation sensor 97, and the preprocessing is performed by a preset function. Part 16
Transport section (scraping device 31, saw depth transport device 36)
The target value of the transportation speed of the grain culm (that is, the rotation speed of the output shaft of the HST 72) in is calculated (step S1 in FIG. 4,
Hereinafter, simply referred to as step S ○).

The target value calculated in step S1 is
The target value calculated last time is compared (step S2). Here, if the newly calculated target value of the grain culm transport speed is different from the previously calculated target value of the grain culm transport speed, the control flag indicating that the grain culm transport speed is being controlled is set to ON. Yes (step S3).

The flag under control is determined (step S
4). When the control flag is ON, the preprocessing device 16
In addition to controlling (accelerating and decelerating) the transportation speed of the grain culms in the transportation section of (i.e., the rotation speed of the output shaft of the HST 72) (step S5), the transportation speed of the grain culms after the control is compared with the target value ( Step S6).

In the step S6, when the controlled transportation speed of the grain culm coincides with the target value, the in-control flag is set to OFF (step S7), and the step S1 is executed.
Repeat the routine from. Further, when the transportation speed of the grain culms after control does not match the target value, the routine from step S1 is repeated while the control flag is ON.

In step S2, if the newly calculated target value and the previously calculated target value are the same, that is, the transport speed of the grain culm in the transport section of the pretreatment unit 16 that is proportional to the traveling speed of the combine 10 is the target. If the value has reached the value (that is, the control flag is OFF), the control flag is determined in step S4 without setting the control flag.

In step S4, the control flag is set to OF.
At F, the conveyance speed of the grain culm in the conveyance part of the pretreatment part 16 is compared with a target value, and the conveyance state of the grain culm in the conveyance part of the pretreatment part 16 is determined (step S8). If the grain culm transport speed in the transport unit of the pretreatment unit 16 is not lower than the target value by a predetermined ratio or more, the routine from step S1 is repeated.

In step S8, when the transport speed of the grain culm in the transport unit of the pretreatment unit 16 is lower than the target value by a predetermined ratio or more, the grain culm is transported to the transport unit of the pretreatment unit 16. Judge that a clogging has occurred and E /
The G-stop solenoid 103 is activated, and the engine 13
Is stopped (step S9), the traveling of the combine 10 is stopped, and the transportation of the grain culm in the transportation section of the pretreatment section 16 is stopped.

In step S9, the engine 13
Instead of stopping, the harvesting clutch 79 may be turned off to stop the driving of the pretreatment unit 16. Also, HS
The T drive motor 75 may be operated to stop the rotation of the output shaft of the HST 72.

As described above, the traveling speed and the preprocessing unit 16
In the combine 10 in which the transport speed of the grain culms in the transporting unit is controlled in a proportional relation, when the proportional relation collapses by a predetermined ratio or more, it is considered that the transporting jam of the grain culm has occurred in the pretreatment unit 16. By stopping the transportation of the grain culm in the pretreatment unit, the HST72 can be stopped before the excessive pressure acts on the HST72.
72 can be protected.

In this way, while the traveling of the combine 10 is stopped and the driving of the pretreatment section 16 is stopped, the grain culms clogging the transport section of the pretreatment section 16 are removed.

A control device 85 for such a combine 10
2nd Embodiment of the conveyance control of the grain culm in 3rd is described with reference to the flowchart shown in FIG. Note that steps S1 to S8 shown in FIG. 5 are the same as steps S1 to S8 shown in FIG. 4, so description thereof will be omitted.

When it is determined in step S8 that the transport speed of the grain culm in the transport section of the pretreatment section 16 has decreased, the level of the decrease in transport speed is determined (step S10). In this step S10, a decrease in the grain culm transport speed in the pretreatment unit 16 is caused by a decrease in the grain culm transport speed, but not enough to stop the transportation of the grain culm, and the pretreatment unit 1
Judgment is made in two stages of stage 2 in which the transportation of the grain culm in 6 must be stopped.

When it is determined in step S10 that the stage is 1, the horn 101 of the combine 10 is, for example, intermittently sounded to give a warning sound to the user, so that the conveyor of the pre-processing section 16 is instructed by the grain culm. An alarm pre-bell is sent to notify that a jam of transport is about to occur (step S11).

When it is determined to be Step 2 in step S10, the engine 13 of the combine 10 is stopped to stop the transportation of the grain culm in the pretreatment unit 16, and the horn 101 is continuously operated, for example. Soundingly as an alarm sound to inform the user that the transportation of the pretreatment section 16 has jammed the grain culms (step S1).
2).

With such a configuration, the traveling of the combine 10 is stopped and the grain culm in the pretreatment unit 16 is stopped before the conveyance jam of the grain culm in the conveying unit of the pretreatment unit 16 causes the combine 10 to malfunction. It is possible to discharge the grain culm accumulated in the pretreatment unit 16 by removing the grain culm or putting the combine 10 in the hand handling mode and cutting the grain without feeding the grain culm in the pretreatment unit 16 to the threshing unit 45. Because you can
It is possible to protect the HST72 by eliminating serious accidents.

The determination in step S10 may be performed not only in two steps but also in three steps or more, and appropriate treatment may be performed in each step.

Thus, when the combine 10 is restarted or the combine is started after the clogging of the grain culms in the pretreatment unit 16 is cleared, the traveling speed of the combine 10 and the pretreatment unit 16 are restarted. There is no proportional relationship with the transportation speed of grain culms in.

The transfer control of the grain culm at the time of starting or restarting the combine 10 will be described with reference to the flowchart shown in FIG.

The main switch 90 of the combine 10 is turned off.
It is determined whether N (power ON reset) has been performed (step S21).

In step S21, the main switch 9
When 0 is turned on, the HST 72 of the pretreatment transmission 71
Is decelerated (step S22). That is, when the main switch 90 is turned on, the HST drive motor 75 is
It operates in the direction of decelerating T72 to set the rotation speed of the output shaft of HST72 to "0".

It is determined whether or not the transport speed control condition is satisfied (step S23). Here, for example, hand combine work, confirmation work after clearing transport clogging of grain culms, maintenance work such as lubrication, etc., combine 1
In the case of work performed with 0 stopped, or when traveling on the road, it is determined that the transport speed control condition is not satisfied (NG). That is, it is determined that the transport control condition is satisfied (OK) only when the combine 10 starts traveling to start the mowing operation. If the transport speed control condition is not satisfied, the routine from step S21 is repeated.

When the transport speed control condition is satisfied, the combine 10 is detected by the output of the T / M rotation sensor 97.
Of the traveling speed (rotational speed of HST 60) is calculated, and a target value of the transportation speed (rotational speed of HST 72) in the transportation section of the preprocessing unit 16 is calculated (step S24).

By detecting the output of the HST rotation sensor 98,
The target value calculated in step S24 and the HST72
Is compared with the current rotation speed (current value) of (step S
25). Here, if the rotation speed of the output shaft of the HST 72 is smaller than the target value, the HST drive motor 75 is controlled so as to increase the rotation speed of the output shaft of the HST 72.
(Step S26).

By controlling the HST drive motor 75 in step S26, it is determined whether or not the rotation speed of the output shaft of the HST 72 has increased (step S27). This determination is made by comparing the rotational speed of the output shaft of the HST 72 at the time of the previous determination with the rotational speed of the output shaft of the HST at the time of the present determination.

When the rotational speed of the output shaft of the HST 72 is increased in step S27, the current operating state of the combine 10 is maintained, and the routine from step S21 is repeated.

In step S27, when the rotation speed of the output shaft of the HST 72 at the time of this determination is not higher than the rotation speed of the output shaft of the HST 72 at the time of the previous determination, the conveyance of the preprocessing unit 16 is performed. It is judged that there is a jam of the grain culm in the part, the engine 13 is stopped,
The traveling of the combine 10 is stopped (step S2
8).

If it is determined in step S25 that the current value is not smaller than the target value, the current value and the target value are compared again (step S29). Then, if it is determined to be ON (the current value is not larger than the target value, that is, the current value is the same as the target value), the routine from step S21 is repeated.

If it is determined to be YES (the current value is larger than the target value) in step S29, the HST drive motor 75 is controlled so that the rotation of the output shaft of the HST 72 is decelerated (step S30). Then, the routine from step S21 is repeated.

As described above, in the present embodiment, even when the combine 10 is started when the proportional control of the traveling speed of the combine 10 and the transport speed of the grain culm in the preprocessing section 16 is not established, the preprocessing section 16 is also started. Since it is possible to detect the conveyance clogging of the grain culm in the
Can be protected.

[0077]

As described above, according to the present invention, after the transport speed of the grain culm in the pretreatment section becomes proportional to the traveling speed of the combine, the transport rate of the grain culm in the pretreatment section becomes When the rotation speed does not increase when the output speed of the preprocessing drive continuously variable transmission is commanded to decrease by a predetermined ratio or more from the proportional relationship, the transportation of the grain stems in the preprocessing unit As a result, the pretreatment continuously variable transmission is prevented from being applied with excessive pressure, and the pretreatment drive continuously variable transmission can be protected.

[Brief description of drawings]

FIG. 1 is a sectional side view of a combine for implementing the present invention.

FIG. 2 is a drive system diagram of the combine shown in FIG.

FIG. 3 is a control system diagram of the combine in FIG.

FIG. 4 is a flowchart showing a process of grain culm transport control.

FIG. 5 is a flowchart showing a process of second grain culm transport control.

FIG. 6 is a flowchart showing a process of third grain culm transport control.

[Explanation of symbols]

10 ... Combine 11 ... Crawler traveling device 13 ... Power source (engine) 16 ... Pretreatment unit 45 ... Threshing department 46 ... Feed chain 60 ... Continuously variable transmission (HST) for traveling drive 72 ... Continuously variable transmission (HST) for pretreatment drive 85 ... Control device

Continued front page    (72) Inventor Tatsuya Yamazaki             Shimane Prefecture Yatsuka-gun Higashi Izumo-cho Ojiyacho 667             1 Within Mitsubishi Agricultural Machinery Co., Ltd. (72) Inventor Masahiro Nishikori             Shimane Prefecture Yatsuka-gun Higashi Izumo-cho Ojiyacho 667             1 Within Mitsubishi Agricultural Machinery Co., Ltd. (72) Inventor Toshiyuki Ishibashi             Shimane Prefecture Yatsuka-gun Higashi Izumo-cho Ojiyacho 667             1 Within Mitsubishi Agricultural Machinery Co., Ltd. (72) Inventor Takashi Kadowaki             Shimane Prefecture Yatsuka-gun Higashi Izumo-cho Ojiyacho 667             1 Within Mitsubishi Agricultural Machinery Co., Ltd. F term (reference) 2B076 AA03 CA19 DA05 DA09 DB08                       DD04 EA01 EB05 EC23 ED01                       ED06                 2B084 AA01 BH02 BH06 BH13                 2B085 AA02 AC17 AC18 AC55 BC20                       BE11

Claims (2)

[Claims] 1. A continuously variable transmission for traveling drive for transmitting a power source, an output of the power source to a crawler traveling device to drive a combine, and an output of the power source for feeding to a pretreatment section and a threshing section. A continuously variable transmission for pretreatment drive that transmits to the chain to perform cutting and transportation of grain culm, and controls the traveling speed of the combine and the transportation speed of the grain stalk in the preprocessing unit in a proportional relationship. In the combine grain culm transporting device, the transport speed of the grain culm in the pretreatment unit becomes proportional to the traveling speed of the combine, and then the transport speed of the grain culm in the pretreatment unit is more than the proportional relation. A control device configured to stop the transportation of the grain culm in the pretreatment unit when the grain culm is reduced by a predetermined ratio or more. 2. A power source, a continuously variable transmission for traveling drive for transmitting the output of the power source to a crawler traveling device to drive the combine, and an output of the power source for feeding to a pretreatment unit and a threshing unit. A continuously variable transmission for pretreatment drive that transmits to the chain to perform cutting and transportation of grain culm, and controls the traveling speed of the combine and the transportation speed of the grain stalk in the preprocessing unit in a proportional relationship. In the combine grain culm transporting device, the power source is started, and after the pretreatment drive continuously variable transmission is stopped, a command is issued to increase the speed of the output shaft of the pretreatment drive continuously variable transmission. Even if the rotation speed does not increase, a control device for stopping the transportation of the grain culm in the pretreatment unit is provided.