JPS5825770Y2 - Mowing height sensor mounting structure for reaper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure for installing a cutting height sensor for controlling the cutting height of a culm in a reaper.

Reaping work using a reaper involves ripping apart the culms in the field with a weeding body installed at the front end of the machine, and then raising the fallen culms with a lifting device and harvesting them.

In this reaping operation, the cutting height is determined by the length of the culm in the field or the conditions of the field (dry field, wet field).

The cutting height is adjusted by raising and lowering the cutting frame 2 that supports the cutting blade 1, as shown in FIG. 1, to change its height above the ground.

That is, it is set by changing the distance between the reaping frame and the tip of the actuator 3a (low mowing when short, high mowing when long).

After adjusting the mowing height, the mowing operation is carried out, but during mowing, the height of the cutting blade 1 relative to the ground must be kept constant regardless of the height of the ground.

For this reason, a cutting height sensor 3 is provided on the cutting frame that supports the cutting blade 1, and the control is performed by sensing changes in the height of the ground and operating a hydraulic cylinder to raise and lower the entire cutting group.

FIG. 2 shows the structure of a conventional cutting height sensor.

In the figure, the mowing height sensor 3 is fixed to the rear lower end of the mowing frame 2, and its actuator 3a is always biased with a rotational force in the direction of bringing its tip into contact with the ground.

If the ground is high or low, the tip of the actuator 3a moves up and down, changing the angle a formed between the actuator 3a and the sensor box 3b, which activates a hydraulic cylinder via a solenoid to move the entire cutting area up and down. let

By the way, as mentioned above, the cutting height is adjusted before the start of the cutting work by changing the relative distance between the cutting frame 2 and the cutting height sensor. For example, if the height setting reference position is set at an intermediate position between the solid line and the chain line shown in the figure, then during reaping work, the mower will move up and down with a trajectory that connects the upper and lower limit positions as shown by the solid line and the chain line, depending on the range of unevenness of the ground.

In this case, in the conventional device shown in FIG. 2, the cutting height sensor 3 is fixed to the cutting frame 2, so the cutting height sensor 3 moves up and down integrally with the cutting frame 2.

Therefore, the angle formed between the actuator 3a and the sensor box 3b changes from a to b, and the ground contact angle of the actuator 3a also changes from C to d. This resulted in errors in control.

The present invention was developed in view of these points, and by connecting the mowing height sensor and the mowing frame with two long and short links to form a four-part parallel link, the mowing height sensor and the mowing frame are connected with each other using two long and short links to form a four-part parallel link. The mowing height sensor of the reaper is configured so that the height above the ground and the angle above the ground are always kept constant without the height sensor following this, and detection errors in setting the standard mowing height and controlling the mowing height are eliminated. The appendix provides structure.

The structure and the like will be explained in detail below with reference to embodiments shown in the drawings.

FIG. 3 is a side view showing the structure of the mowing height sensor installation according to the present invention.

In the figure, the reaping frame 2 is installed on both sides of the machine at the lower end of the reaping machine so that it can be raised and lowered, as in the conventional device shown in Figure 1, and it can be operated from the driver's seat to reach the upper and lower limits shown by solid lines and chain lines in the figure. It ascends and descends with a trajectory that connects the positions.

A cutting blade 1 provided by connecting the central parts of the reaping frames 2 on both sides is formed in the shape of a clipper and cuts the root of the grain culm.

Reference numeral 3 denotes a cutting height sensor, which is composed of a sensor box 3b and an actuator 3a rotatably attached to the side surface of the sensor box 3b.

Parallel links 5, 5 each consisting of two long and short links are rotatably attached to a pivot shaft 4 installed on the cutting height sensor 3 at an appropriate interval.

The other ends of the links 5, 5 are rotatably connected to a pivot 6 which is installed in the reaping frame 2 at an appropriate interval.

Reference numeral 7 denotes a mowing height adjustment wire whose one end is pivotally connected to the link 5 to support the sensor box 3b in a suspended state from above.By operating this wire, the relative position between the mowing frame 2 and the sensor box 3 can be adjusted. It changes the distance.

With the structure described above, when the mowing frame 2 rises from the position shown by the solid line to the position shown by the chain line in the figure, the link 5 also rotates to the position shown by the chain line, but the cutting height sensor 3 Maintain the old position in terms of ground angle.

As is clear from the above explanation, in the present invention, in the automatic cutting height control device of the reaper, the cutting height sensor is connected to the cutting blade frame by two links and installed so as to form a four-part parallel link. As a result, even if the cutting blade frame is raised or lowered, the cutting height sensor does not follow this and always maintains the ground angle constant, reducing detection errors in setting the standard cutting height and controlling cutting height during cutting work. Accurate control is always performed without causing any problems.

[Brief explanation of the drawing]

Figures 1 and 2 show the structure of a conventional reaper with a cutting height sensor installed, Figure 1 is a side view showing an outline of a reaper that implements this, and Figure 2 shows the installation of a cutting height sensor. The attached part is a side view of the part, and FIG. 3 is a side view showing the structure of the attachment of the cutting height sensor of the reaper according to the present invention. 2... Reaping frame, 3... Cutting height sensor, 3a... Actuator, 5...
···Link.

Claims (1)

[Scope of utility model registration request] In a reaper equipped with a control device that grounds an actuator 3a of a mowing height sensor 3 and senses the height relative to the ground through rotation of the actuator 3a to raise and lower the mowing section and control the mowing height, one end is connected to the mowing section. The mowing height sensor 3 is attached to the mowing frame 2 via parallel links 5, 5, which are pivotally attached to the front and rear of the sensor box 3b of the height sensor 3, and whose other ends are pivotally coupled to the mowing frame 2. The mowing height sensor mounting structure of the reaper is characterized in that the mowing height sensor 3 is held by a mowing height adjuster.