JPS5831485Y2 - combine - Google Patents

Description

[Detailed description of the invention] This invention relates to a combine harvester that automatically controls the height of the cutting section above the ground using a sensor for controlling the cutting height. To provide a combine harvester in which there is no fear that a sensor will be damaged even when the machine is moved backwards with the machine being lowered.

In general, combine harvesters equipped with a cutting height control sensor do not use automatic control and when the machine is moved backwards with the cutting section lowered manually, the grounding piece of the sensor swings downward beyond a certain range. This may cause damage to parts such as the grounding piece.

Therefore, the present invention was devised to eliminate such problems, and the circuit is opened in the electric circuit for automatic control of the reaping section, which is equipped with a rise switch and a fall switch that are opened and closed by the rocking of the grounding piece. In addition to interposing a manual switch, a safety switch is provided at a downward swing position of the grounding piece above a certain range, and this safety switch is interposed in a bypass circuit to a power source that bypasses the rising switch in the electric circuit. It is characterized by the fact that it is equipped with

Embodiments of the present invention will be described below based on illustrative drawings.

In the figure, reference numeral 1 denotes a cutting rod of a cutting section (not shown) supported on the machine body so that it can be raised and lowered, and a mowing height control sensor 2 equipped with a grounding piece 3 is attached to the cutting rod 1 via a bracket 4. At the same time, the sensor 2 is equipped with a lift switch SW which is activated by the counterclockwise rocking of the grounding piece 3 (position ∫ in the imaginary line in Figure 1) and a clockwise rocking of the grounding piece 3 (the first A lowering switch SW2 is provided which is activated by the imaginary line II position in the figure.

On the other hand, a hydraulic piston 5 for lifting and lowering is connected to the reaping section, and the hydraulic piston 5 is communicated with a hydraulic pump P, and an electromagnetic switching valve 6 is interposed in the communication path, and this electromagnetic switching valve 6
A manual switching valve 7 and a pressure compensation type pilot valve 8 are interposed between the hydraulic piston 5 and the hydraulic piston 5.

Therefore, the solenoid 5QL1°5O of the electromagnetic switching valve 6
L2 is connected to the switch SW1. While connecting to the power source E through the normally open contact of SW2, this swing (first
A safety switch SWa is provided to sense the position of the imaginary line III in the figure, and this safety switch SWa is interposed in a bypass circuit a to a power source E that bypasses the rise switch SW1 in the electric circuit.

In the figure, PB is a manual switch for automatic/manual switching.

The combine harvester of the present invention is constructed as described above, and when the manual switch PB is turned ON to close the automatic control circuit and the machine is moved forward, if the relative height of the reaping part is low, the sensor 2 The grounding piece 3 swings counterclockwise to turn on the rise switch SW1, and the solenoid SQL
is energized and switches the electromagnetic switching valve 6 to the right in the figure, supplies pressure oil from the hydraulic pump P to the right chamber of the hydraulic piston 5, opens the left chamber to the tank T, and closes the reaping section. If the height of the reaped part is high from the ground,
Pressure oil from the hydraulic pump P is supplied to the left chamber of the hydraulic piston 5 in the same operating order as described above, and the reaping section is lowered from the ground.

At this time, the circulation circuit to the manual switching valve 7 is closed, and even if the switching valve 7 is operated, the hydraulic piston 5 is not affected in any way.

When the manual switch PB is turned OFF to close the automatic control circuit, the electromagnetic switching valve 6 returns to the offshore position, and the pressure oil from the hydraulic pump P is supplied to the manual switching valve 7 side. Ru.

At this time, if the manual switching valve 7 is in the neutral position, the pressure oil is returned to the tank T.

In order to raise and lower the reaping section in such a state, it is sufficient to switch the manual switching valve 7 to either the left or right side, and thereby the pressure oil from the hydraulic pump P acts on the right or left side of the pilot valve 8. The valve 8 is then switched to either the left or right side, and the pressure oil is supplied to the right or left chamber of the hydraulic piston 5, thereby raising and lowering the reaping section.

In this way, when the reaping section is lowered manually without using automatic control as described above, when the machine moves backward, the grounding piece 3 of the sensor 2 gets caught on the ground or the stump of a grain stalk, causing it to move clockwise. It swings downward over a certain range, but when it swings like this, the safety switch SWa is turned on,
Solenoid SQL regardless of the development of the electric circuit for automatic control
is energized by the power source E via the bypass circuit a, switches the electromagnetic switching valve 6 as described above, supplies pressure oil from the hydraulic pump P to the hydraulic piston 5, and automatically raises the reaping section above the ground. It is.

As explained above, the combine harvester according to the present invention does not damage the cutting height control sensor when the machine is moved backwards with the cutting section lowered manually without using automatic control, that is, the automatic control electric circuit This makes it possible to automatically raise the reaping section regardless of whether it is in the open (off) state, and it has become possible to eliminate the risk of sensor damage when the aircraft moves backwards.

Moreover, since the structure utilizes a device for controlling the height of the cutting section above the ground without using any special device, the structure is extremely simple and can be implemented at low cost.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the present invention; FIG. 1 is a partial side view thereof, FIG. 2 is a plan view thereof, FIG. 3 is a hydraulic circuit diagram, and FIG. 4 is an electric circuit diagram. 2... Sensor for cutting height control, 3...
Grounding piece, SWl...Rising switch, SW2...
...Down switch, SWa...Safety switch, a...Bypass circuit, E...Power supply, PB... (for automatic manual switching) manual switch.

Claims (1)

[Scope of utility model registration request] A mowing height control sensor is provided, which includes a grounding piece that is supported so as to be able to swing up and down, and a rise switch and a fall switch that are opened and closed by the swinging of the grounding piece. In the combine harvester, a manual switch for opening the circuit is interposed in the electric circuit for automatic control of the reaping section, which is interposed with each of the switches. A combine harvester characterized in that a safety switch is provided at a downward swinging position of the combine harvester, and the safety switch is interposed in a bypass circuit to a power source that bypasses the rise switch in the electric circuit.