JPH0548085B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention eliminates the need to continue reaping work when there is no grain culm in the reaping section after reaping, or when the machine is retreating. The present invention relates to an improvement in a combine harvester equipped with a mechanism that automatically raises the reaping section above the ground surface and prevents damage due to collision with other objects.

(Prior art) Conventionally, a grain culm presence sensor that detects whether or not there is grain culm in the reaping section, and a back switch that is activated when the change lever on the driver's seat is switched to the reverse position, are used to raise the reaping section. Connected to the solenoid valve of the hydraulic system, it detects when there is no grain in the reaping section or when the change lever is switched to the backward position, and in either case, the hydraulic system is immediately started to safely move the reaping section. It was automatically raised to the same height.

(Problem to be solved by the invention) In this way, conventionally, when the change lever is switched to the backward position, the reaping section is immediately raised in the same way as when there is no grain culm in the reaping section. When reversing the machine with the tip of the cutting section inserted between the rows of uncut grain culms, the grain culm could become entangled with the rising tip of the cutting section and be forcibly pulled out.

An object of the present invention is to prevent the rising reaping section from pulling out the grain culms and wasting them, and to prevent the tip of the reaping section from breaking due to the impact of pulling out the grain when the machine moves backward.

(Means for Solving the Invention) In the present invention, as shown in the functional block diagram of FIG. A rise timing determining means 3 is provided for determining whether to ascend immediately or after a certain period of time has elapsed, and a control signal from this determining means 3 controls a rising mechanism control means 4, so that when the aircraft retreats, the above fixed period of time is determined. It is characterized in that the reaping part raising mechanism 5 is stopped until the time elapses.

(Function) As a result, when there is no grain culm in the reaping part while the machine is moving forward, the grain culm presence/absence sensor 1 detects this, and the rise timing determining means 3 outputs a rise timing signal to immediately raise the reaping part. When moving the machine backwards, the back sensor 2 detects this, and even if the grain culm presence/absence sensor 1 outputs a detection signal indicating no grain culm, the ascent timing determining means 3 determines the ascent timing so that the reaping section is stopped until a certain period of time has elapsed. A signal is output, and the reaping section is raised after the margin time for the tip of the reaping section to retire backward from between the grain culm rows has elapsed.

(Example) Next, embodiments of the present invention will be described with reference to the drawings.

Reference numeral 6 denotes a conventionally known combine reaping section, which has a grass cutting rod 7, a grain culm moving device 8, a raking device 9, and a clipper blade 10, and is moved up and down by a hydraulic cylinder 13 around a connecting shaft 12 with a combine main body 11 as a fulcrum. It is rotatably connected to.

Then, a grain culm presence sensor 1 consisting of a limit switch 1a is attached to the outer wall of the raking device 9 in front of the clipper blade 10, and the switch operating piece is made to look into the grain culm transfer path, and the limit switch 2a is operated as a back sensor 2. It is attached to the main part of the change lever 15 of the seat 14, and when the lever 15 is switched to the backward position, a part of the shaft pushes the switch 2a.

The output side of the limit switch 2a for the back sensor 2 (point A in Figure 2) is branched into two branches, one of which is connected to the input side of the AND circuit 17 via the inverter 16, and the other is connected to the input side of the AND circuit 17 via the delay circuit 18 and the OR circuit 19.
Connect to the input side of the Also, the output side of the limit switch 1a for the grain culm presence sensor 1 (point B in Figure 2)
is connected to the input side of the AND circuit 17, and the output side of the AND circuit 17 (point C in FIG. 2) is connected to the input side of the OR circuit 19. The output side of the OR circuit 19 (point D in Figure 2) is connected to the cutting section height sensor 20.
It is connected to the input side of the CPU 21, and the solenoid valve 22 of the hydraulic cylinder 13 is connected to its output side. The reaping section height sensor 20 detects the height of the reaping section 6 relative to the combine main body 11 by moving a potentiometer in conjunction with the rotation of the reaping section 6 about the connection shaft 12 as a fulcrum. 23 and 24 are an input interface and an output interface, respectively.

The reaping unit 6 is lowered to near the ground surface and the machine moves forward to perform the reaping operation, and when there are no more uncut grain culms in the process, the switch operating piece of the limit switch 1a is elastically moved to the grain culm transfer path of the raking device 9. As a result, it is detected that there is no grain culm in the reaping section 6, and the detection signal of the limit switch 1a changes from L to H level. At this time, change lever 1
If point 5 is not in the backward position R but in the forward position D or neutral position N, the detection signal of the limit switch 2a is at L level, so the point C is the limit switch 1.
At the same time that a switches from L to H level, it becomes H level, and therefore point D also becomes H level. As a result, the CPU 21 outputs a control signal instructing a continuous rise, the solenoid valve 22 opens, the hydraulic cylinder 13 extends, and the reaping part 6 rises at the same time as the grain culm disappears (see truth table in Figure 3).

Next, when the change lever 15 is moved to the reverse position R, the limit switch 2a is closed, and the detection signal changes from L to H level, point C in FIG.
, and the signal level at point D remains at the L level until the time set by the delay circuit 18 (for example, 3 seconds) has elapsed.
The solenoid valve 22 is closed and the raising of the reaping section 6 is interrupted.

After that, after the aforementioned set time has elapsed, the delay circuit 1
When the output side of 8 becomes H level, the D point becomes H level, the solenoid valve 22 opens and the reaping part 6 starts to rise again (see the truth table in FIG. 3).

When the reaping section 6 rises to a predetermined safe fixed point (for example, a height of 40 cm above the ground), the reaping section height sensor 20 detects this and outputs a stop signal, and the reaping section 6 stands still.

In this way, the reaping section 6 temporarily stops while the machine is retreating, so if uncut grain culms remain in front of the reaping section, the cutting rod 7 inserted between the rows of the grain culms will be at that height. It retreats and is pulled away from the grain culm without any hindrance.
Also, the grain culm entangled with the rub of the moving device 8 is also separated from the machine body.

Note that even one grain culm presence/absence sensor 1 may be used, but in that case, it is preferable to install it at a position away from the driver's seat 14.

As the sensors 1 and 2, optical non-contact detection means may be used in addition to limit switches.

(Effect) In short, in the present invention, the ascent timing determining means 3 is provided, and based on the detection signals from both the grain culm presence sensor 1 and the back sensor 2, the ascent is always suspended for a certain period of time when the aircraft is retreating. The grain culms entangled with the reaping part 6 are also separated, and the reaping part 6 can be raised smoothly thereafter, and the grain culms can also be prevented from being pulled out.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram of the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 3 is a truth table at each point in FIG. Fig. 4 is a flowchart, Fig. 5 is a plan view of the combine harvester with the dividing rod and pulling device of the combine reaping section removed, Fig. 6 is a cross-sectional view of the change lever, Fig. FIG. 7 is a side view of the combine harvester reaping section. 1 is a grain culm presence sensor, 2 is a buck sensor, 3 is a lifting timing determining means, 4 is a lifting mechanism control means, and 5 is a reaping part lifting mechanism.

Claims (1)

[Scope of Claims] 1. A reaping section lifting mechanism 5 that raises the reaping section of the combine; A grain culm detection sensor 1 that detects the presence or absence of grain culms in the reaping section; A back sensor 2 that detects the backward movement of the combine harvester body. , When reversing the machine based on the detection signals of both sensors 1 and 2, the reaping section is raised after a certain period of time after the machine starts moving backwards, and if the grain culms are exhausted without moving the machine backward, the machine immediately reaps the grain. and a raising mechanism control means 4 that controls the reaping part raising mechanism 5 based on a tamming signal from the determining means 3. A device for raising the reaping part of a combine harvester.