JPS585002B2 - Combine cutting height control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cutting height control device for a combine harvester.

Generally, a combine harvester has a cutting height sensor which is a means for keeping the cutting height of the culm at a constant height from the ground.

This cutting height sensor is installed on a continuous cutting rod at the tip of a frame extending from the combine main body, and detects the height of the cutting section by bringing an arc-shaped actuator into contact with the ground. The hydraulic cylinder that rotates the frame is operated to keep the mowing height constant.

The presence of this cutting height sensor allows the combine harvester to always maintain a constant height while cutting the culm.

However, if the shell culm is lying down, the shell culm may not be able to be harvested at this constant cutting height.

In other words, the cutting height must be set lower than the normal state.

However, conventional cutting height sensors are configured to automatically adjust to a preset constant cutting height, so it is difficult to operate to lower the cutting height in response to special cases such as this. cannot be made to do so.

The present invention was made in view of the above circumstances,
The details will be explained below together with the embodiments shown in the drawings.

FIG. 1 and the following illustrate one embodiment of the present invention. In the figures, reference numeral 1 indicates the entire combine harvester, and in front of it is attached a frame 2 that is rotated by a hydraulic cylinder (not shown). At the tip of 2, there is a continuous dividing rod 3.

An inverted cone-shaped grass divider 4 is attached to the tip of the grass divider 3,
A plurality of shell culm lifting devices 5 are installed in parallel inside these weeding bodies 4 and above the weeding rods.

As is clear from FIGS. 2 and 3, a culm lodging sensing sensor 6 is attached to the upper part of the weeding body 4.

The lodging detection sensor 6 has a switch box 6a and an actuator 6b, and when the culm 7 is lodging, its tip comes into contact and rotates the actuator 6b to turn on the switch and detect the lodging state.

Further, a culm detection sensor 8 is attached below the weeding body 4, and this culm detection sensor 8 consists of a linear actuator 8a extending horizontally to the side of the weeding body and a switch box 3b. .

On the other hand, as shown in FIG. 3, a cutting height sensor 9 is attached to the base of the weeding rod 3.

The cutting height sensor 9 includes a switch box 9a and an actuator 9b.The actuator 9b is formed in an arc shape, and its base is rotatably supported on the switch box 9a.

As shown in the enlarged view in FIG. 4, the switch box 9 has two contacts S with a rotatable actuator 9b sandwiched between them.
1. There is an actuator S2 and actuator 9 according to the unevenness of the ground.
b rotates up and down, these contacts S1. The position of the frame 2 and the weeding rod 3 that constitute the reaping section if they do not contact S2,
In other words, no signal is output to change the cutting height.

To be more specific, if the actuator 9b rotates upward enough to contact the contact point S1, the distance between the ground and the ground becomes smaller, and the signal activates a cylinder (not shown) to increase the cutting height. Frame 2, dividing rod 3 is raised as follows.

Furthermore, when the actuator 9b comes into contact with the contact point S2, the distance between the ground and the ground increases, and the frame 2 and the weeding rod 3 are lowered in response to this signal so as to lower the cutting height.

As shown in FIGS. 3 and 4, the lower end of a connecting rod 10 is rotatably connected to a cam C rotatably provided adjacent to the base of the actuator 9b. The upper end is rotatably connected to one end of a crank arm 12 rotatably supported on a machine frame 11 on the combine main body side.

The other end of the crank arm 12 is rotatably connected to the tip of a rod of a solenoid 13 fixed to the side surface of the machine frame 11.

Further, a spring 14 is stretched between the other end of the crank arm 12 and the machine frame and the side facing the solenoid 13, but the tensile force of this spring 14 is smaller than the suction force of the solenoid 13.

Therefore, when the solenoid 13 is energized, the crank arm 12 is attracted against the tensile force of the spring 14, and the actuator 9b is rotated upward via the connecting rod 10 to forcibly connect the actuator 9b to the contact point Sl. ,
By operating the hydraulic cylinder, it is possible to cause a lower cutting height than normal.

Next, regarding the operation of this embodiment configured as above,
This will be explained with reference to the circuit diagram shown in FIG.

First, the combine 1 is operated to harvest the culm while the cutting height sensor 9 maintains the normal operating state. In this state, if the culm does not fall down, only the culm detection sensor 8 detects the culm. is detected and is in the ON state, timer T1 is activated,
After a certain period of time has elapsed, the normally closed switch t1 becomes "open".

However, since the normally open switch t2 is in the "open" state,
Solenoid 13 is not energized.

However, when the lodging detection sensor 6 detects the lodging of the culm, the lodging detection sensor 6 turns ON, and the timer T2 is activated.
After a certain period of time, the switch t2 becomes "closed", and simultaneously or at the same time, the culm detection sensor 8 detects the culm and turns on, the timer T1 is activated, and after a certain period of time, the switch t1 becomes "open".

Here, if the delay time of the timer T1 is set longer than the delay time of the timer T2 by a certain period of time, the switch t1. t
2 are turned on at the same time, the solenoid 13 is energized, and the actuator of the cutting height sensor 9 is rotated counterclockwise in FIG. 4 via the cam C to contact the contact point S2.

Therefore, the cutting height sensor 9 sends a signal that the height above the ground is too high even though the height above the ground is in a normal state, and the frame 2 and the cutting rod 3 are set in advance by a hydraulic cylinder (not shown). The cutting height is lowered by a certain distance.

As a result, the fallen culm 7 is harvested at a low position.

In addition, in the above explanation, as a means to forcefully operate the actuator of the cutting height sensor which is in a normal state,
Although a structure using a solenoid, a link arm, a cam, etc. is adopted, the present invention is not limited to this, and the actuator can be rotated by other means, such as configuring the actuator to be directly rotated by a stepping motor or the like. Rotate or directly switch contact S2 to O.
It will be understood that the configuration may be configured to emit a signal such that N.

As is clear from the above description, according to the present invention, in a combine harvester having a shell culm detection sensor and a lodging detection sensor, when a lodging shell culm is detected, even though the cutting height sensor is in a normal state, the lodging shell is detected. It is configured to send a signal to a hydraulic cylinder that displaces the cutting height position to lower the cutting height so that the culm can be cut accurately, so that when a lodging culm is present, the lower position can be harvested accurately.

[Brief explanation of the drawing]

The drawings are for explaining one embodiment of the present invention. Fig. 1 is an overall side view, Fig. 2 is a front view of the dividing body, Fig. 3 is a side view explaining the present invention in detail, and Fig. 4 is a side view of the whole. FIG. 5 is an enlarged cross-sectional view of the cutting height sensor and is an operating circuit diagram. 1... Combine harvester, 2... Frame,
3...Brunching rod, 4...Brunching body, 5...
... Culm lifting device, 6... Lodging detection sensor, 7... Culm, 8... Culm detection sensor, 9... Mowing Height sensor, 9a... Switch box, 9b... Actuator, 10
...... Connecting rod, 11... Machine frame, 12
...Link arm, 13...Solenoid, 14...Spring.

Claims (1)

[Claims] 1. In a combine harvester having a cutting height sensor, a reaping part whose cutting height is controlled by the detection output of the cutting height sensor, and a culm lodging detection sensor, the culm lodging detection sensor detects a lodging culm. The combine harvester is characterized by comprising means for lowering the reaping section so as to lower the reaping height according to the detection output of the culm lodging sensor even if the reaping height sensor is in the normal position. Cutting height control device.