JPS6040805B2 - combine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combine harvester equipped with a mechanism capable of switching the handling depth between two states, deep and shallow, and a mechanism that automatically controls the vehicle speed to high or low according to an increase or decrease in threshing load.

This type of combine harvester makes it easier to maintain a constant handling depth than when controlling the threshing load to keep it within an appropriate range by switching the handling depth between deep and shallow depending on the increase or decrease in the threshing load. It has the advantage of being able to perform good threshing with less unhandled grain, but on the other hand, if the threshing load increases beyond a certain level and the speed of the vehicle is significantly reduced as a result,
Not only does the harvesting rate drop more than necessary, but the drive speed of each device in the reaping section also drops, causing problems such as a decline in raising performance and reaping performance, or poor reaping.

In view of the above-mentioned circumstances, the present invention has been developed without causing a decrease in hoisting performance or reaping performance or poor reaping, and without reducing harvest efficiency unnecessarily, and without leaving unhandled items. It is possible to appropriately automatically control the threshing load while ensuring good threshing processing, and in the above-mentioned system, when the vehicle speed decreases to a set value, the handling depth adjustment mechanism is set to a shallow position. It is characterized by having an automatic switching mechanism on the grade side.

In other words, until the vehicle speed decreases to the set value, the normal handling depth is determined by controlling the vehicle speed to a low or high level according to the increase or decrease in the threshing load, so that good threshing processing with less leftovers can be achieved.
The threshing load can be properly automatically controlled while this is maintained, but when the load increases above a certain value and the distance of the threshing drops to the set value, the handling depth adjustment mechanism is adjusted to the shallow level. It is possible to control the abnormal load by forcibly switching to the side where the vehicle is moving, so it is possible to prevent a decline in the pulling performance or mowing performance, or to prevent poor mowing, etc. due to the vehicle speed being decelerated below a certain value. It has now become possible to appropriately control the threshing load while maintaining the critical traveling speed without causing any problems or unnecessarily lowering the harvesting efficiency. Embodiments of the present invention will be described in detail below based on the drawings.

FIG. 1 shows a reaping section 6 consisting of a clipper-type cutting blade 4 and a pulling device 5 that engages with the base of the stock of the oak stick near the ground in front of the cutting blade 4 and raises it into a standing position. and a threshing device 9 mounted on a machine frame 8 having a pair of left and right crawler-type traveling devices 7, 7, the grain stalks harvested in an almost vertical position are gradually changed to a horizontal position while the threshing device 9 This figure shows a combine harvester in which a vertical conveying device 10 for conveying and supplying to the device 9 side is provided so as to be able to swing up and down with a fulcrum near the conveying end thereof, and a handling depth provided in the middle of the grain conveying path to the threshing device 9 A handling depth adjustment mechanism 1 that can switch the handling depth into two states, deep and shallow, in response to the detection results of the gutter length detection sensors S, S2 for adjustment, and an increase or decrease of the threshing load during forward movement of the harvest. A vehicle distance control mechanism 2 is provided to automatically control the vehicle speed to a low or high level accordingly, and a mechanism 3 is provided that automatically switches the depth adjustment mechanism 1 to the shallow side when the vehicle distance decreases to a set value. It is configured with the following.

As shown in FIG. 3, the handling depth adjustment mechanism 1 drives a fluid pressure cylinder 11 that vertically swings the vertical conveyance device 10 when both the gutter length detection sensors S, S2 are activated. The electromagnetic switching valve 12 is configured to excite one solenoid SOL to control it in the shallow handling direction, and when both of the gutter length detection sensors S, S2 are in a non-detecting state, the electromagnetic switching valve The other solenoid SOL2 of the sliding door valve 12 is energized and controlled in the deep handling direction.

The automatic vehicle speed control mechanism 2 is constructed as shown in FIGS. 2 and 3.

That is, a detection signal from the load detection device 14 that detects the load of the threshing device 9 as torque transmitted to the handling cylinder 13, and a hydraulic type that transmits the engine power to the pair of left and right traveling devices 7 and the reaping section 6 side. Continuously variable transmission 15 [consisting of a variable displacement pump and a hydraulic motor.

], i.e., a differential transformer 19 detects the swinging position of one link 18 in a link mechanism 17 that connects the gear change lever 16 provided in the control section and the transmission 15. A detection signal from a shift state detection mechanism 20 that detects the shift state is inputted to a comparison circuit 21, and an electric motor capable of switching between forward and reverse directions of an automatic shift operation device 22 that swings the comparison circuit 21 and the link 18. A speed increasing drive circuit 23 is provided between the motor M and a speed increasing drive circuit 23 that issues a speed increasing command to drive the electric motor M in normal rotation based on the comparison result of the comparison circuit 21; The comparator circuit 21 is connected to a deceleration drive circuit 24 that issues a deceleration command to reversely drive the
The electric motor M is driven in forward or reverse rotation based on the comparison result to perform proportional control to maintain the handling torque and the reaping travel speed in an inverse ratio relationship. Further, the link 18 of the link mechanism 17 and the automatic speed change operation device 22 are kinetically connected via a friction transmission device 25, so that the speed change lever 16 can be operated manually even during automatic control.

The eye movement cut-off prediction mechanism 3 inputs the detection result from the shift state detection mechanism 20 and the setting signal from the mechanism 26 for setting the minimum vehicle speed to the comparison circuit 27, and The comparison result is input to the solenoid SOL on the shallow handling control side of the handling depth adjustment mechanism 1, and when the vehicle speed decreases to the set value, the solenoid SOL is energized and controlled in the shallow handling direction. It is structured as possible.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the combine harvester according to the invention,
Figure 1 is an overall side view, Figure 2 is a schematic configuration diagram of the control mechanism,
FIG. 3 is a block diagram of the control mechanism. 1... handling depth adjustment mechanism, 2... automatic vehicle speed mechanism, 3... automatic cutting mechanism. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. Mechanism 1 capable of switching handling depth into two states: deep and shallow
In a combine harvester equipped with a mechanism 2 that automatically controls the vehicle speed to a low or high level according to an increase or decrease in threshing load, when the vehicle speed decreases to a set value, the handling depth adjustment mechanism 1 is set to the shallow handling side. A combine harvester characterized by being provided with a mechanism 3 that automatically switches between the two. 2 The handling depth adjustment mechanism 1 has a handling depth adjustment function based on culm length detection in a deep handling state where the vehicle speed is above the set value, and a culm length adjustment function in a shallow handling state where the vehicle speed is below the set value. The combine harvester according to claim 1, wherein the combine harvester is configured to also have a handling depth adjustment function based on detection.