JPS6262123B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for cutting and harvesting in which the distance between the cutting part of a cutting and harvesting machine such as a combine harvester and the ground is maintained at a predetermined value so that the cutting height of the standing stem culm is always maintained at an appropriate level. This relates to a mowing height control device for a machine.

Conventionally, in this type of control device, the sensing part of the cutting height sensor is kept in sliding contact with the cutting ground, and the relative movement between this sensing part and the cutting part frame is detected by a sensing device such as a micro switch. The reaping section was raised and lowered by

However, with this type of device in which the sensing part is held in sliding contact with the cutting ground, mud or grass, etc. may get entangled in the joint between the sensing part and the cutting part frame, causing the sensing part to become locked. There was a risk that the control function would be lost.

In addition, the conventional type has a large structure and cannot be attached to the tip of the weeding rod, resulting in poor detection accuracy.Furthermore, the sensing part must always protrude below the weeding rod. When harvesting fallen timber, the tips of the weeders could not be controlled so that they were close to the ground, and the problem was that the weeders could not perform an auxiliary combing action.

The present invention was devised to eliminate the above-mentioned drawbacks, and its purpose is to use the ground pressure of the weeding rod supporting the weeders as a signal source for raising and lowering the reaping section. , a reaping/harvesting machine that can control the desired cutting height not only for upright erect stem culms but also for lodging erect stem culms, and at the same time maintain high control reliability and durability. It is intended to provide a mowing height control position.

To explain the configuration of the present invention with reference to each embodiment shown in the drawings, 1 is a body frame of a combine on which a threshing section 2 is mounted, and the body frame 1 is equipped with a traveling device 3. A reaping section 4 is attached to the front part of the reaping section 4 so as to be movable up and down.

The reaping section 4 includes a cutting blade 6 attached to a reaping section frame 5, a grass dividing rod 7 extending forward from the reaping section frame 5 along the cutting ground, and a grass dividing rod 7 attached to the tip of the cutting section 7. A weeder 8, a grain culm combing device 9 for combing the reaped grain culms separated from the standing grain culm group by the shearer 8, and a weeding rod 7 extending outward from one side of the fuselage. Consists of 10 narrow guides,
The tip of the weeding rod 7 is brought into sliding contact with the reaping ground to reap the weeded grain culm.

In addition, a stress detection sensor 11 is installed near the front end of the weeding rod 7 to detect stress changes caused by the ground pressure of the weeding rod 7, and the strain resistance wire 12 is connected to the strain resistance wire 12 under the control described below. It is connected to the circuit via a lead wire 13.

In addition, the stress detection sensor 11 is basically attached directly to the dividing rod 7 as shown in FIGS. 2 and 3, but if the rigidity of the dividing rod 7 is too large, As shown in FIG. 2, the intermediate portion of the grass dividing rod 7 may be constructed of an elastic body 7a, and the ground pressure of the grass dividing rod 7 may be detected through the stress of the elastic body 7a. In addition, in order to prevent the weeding rod 7 from being buried in wet fields etc., as shown in FIGS.
By installing b, it is sufficient to reduce the ground pressure of the weeding rod 7 and prevent it from sinking.

On the other hand, the stress detection sensor 11 attached to the dividing rod 7
The output is input to the detection circuit 14 via the lead wire 13, as shown in FIG. This detection circuit 14 has a built-in amplifier and the like, and is configured such that the output value output from the detection circuit 14 increases as the upward stress increases due to the increase in the ground pressure of the dividing rod 7. . Further, the output of the detection circuit is input to the rising amplifier 16c together with the reference value output from the rising reference setting device 15c, and is input to the falling amplifier 16c together with the reference value output from the falling reference setting device 15d. 6d.

In this case, the rising amplifier 16c opens the rising solenoid valve 18c via the switching element 17c when the value output from the detection circuit 14 is higher than the reference value output from the rising reference setting device 15c. In addition, the descending amplifier 16
d opens the lowering solenoid valve 18d via the switching element 17d when the output value from the detection circuit 14 is smaller than the reference value set by the lowering reference setting device 15d. When the solenoid valve 18c for raising is opened, a hydraulic lifting device (not shown) raises the reaping section 4, and conversely, when the solenoid valve 18d for lowering is opened, a hydraulic lifting device (not shown) raises the reaping section 4. It is designed to lower.

Note that this hydraulic lifting device can also be controlled up and down by a manual lever (not shown).

Next, the operation of the present invention constructed as described above will be explained. Now, lower the cutting section 4 and move the cutting rod 7.
When the machine moves forward while sliding its tip on the cutting ground, the ground pressure of the grass dividing rod 7 changes depending on the unevenness of the cutting ground, and the upward stress generated on the grass dividing rod 7 changes, so this stress The distance between the cutting blade 6 of the reaping unit 4 and the cutting ground, that is, the cutting height of the grain culm can be detected through this. In addition, the stress detection sensor 11
The detection circuit 14 detects a signal corresponding to the stress of the branching rod 7.
Since the detection circuit 14 is configured such that the output value increases as the upward stress increases, the output value of the detection circuit 14 is within the allowable range, that is, the rising reference setting device 15c When it is lower than the set reference value and higher than the reference value set by the lowering reference setting device 15d, it is determined that the height above the ground (cutting height) of the cutting section 4 is within a predetermined allowable range. In addition, in this state, which amplifier 16
c and 16d are also not activated, so the reaping section 4 is not raised or lowered.

Furthermore, when the height of the reaping section 4 above the ground becomes smaller than the allowable value, a detection circuit 14 that responds to the stress of the weeding rod 7
Since the output value becomes higher than the reference value for raising and the amplifier 16c for raising is driven, the solenoid valve 18c for raising is opened via the switching element 17c. When the lifting solenoid valve 18c is opened in this way, the cutting section 4 is lifted and the stress on the weeding rod 7 is gradually reduced. When this stress, that is, the height of the reaping section 4 above the ground, is returned to a predetermined value, the output value of the detection circuit 14 is also returned to the same level as the reference value for raising, so the amplifier 16c is stopped and the height for raising Solenoid valve 18
c is closed, and the raising of the reaping part 4 is stopped. Such raising and lowering of the reaping section 4 is performed via the lowering circuits even when the height of the reaping section 4 above the ground exceeds a predetermined value, so that the height of the reaping section 4 above the ground is maintained constant. , the cutting height of the stem culm is automatically controlled within a predetermined range.

In short, the present invention provides a stress detection sensor that detects the ground pressure of the weeding rod from the stress at an appropriate position of the weeding rod that supports the weeder, and also detects the ground pressure of the weeding rod based on the output of the stress detection sensor. Since the reaping section is configured to be controlled up and down, the height of the reaping section above the ground (cutting height of the stem culm) can be accurately detected from the stress of the dividing rod, and moreover, compared to conventional detection devices, The mowing height detection part can be configured extremely compactly, there is no risk of malfunction due to entanglement with mud or grass, etc., and the mowing rod can always be in sliding contact with the mowing ground, making the mowing height easier. It is possible to improve the weeding action of the standing stem culms by the weeders supported by the rods and the auxiliary combing action, and the reliability of the control device is improved because the cutting height is detected by a so-called non-contact sensor. This has an extremely useful practical effect of significantly improving properties and durability.

[Brief explanation of the drawing]

The drawings show an embodiment in which the cutting height control device for a reaping harvester according to the present invention is applied to a combine harvester, and FIG. 1 is an overall side view of the combine harvester;
Fig. 2 is a side view of the main part showing the first embodiment, Fig. 3 is a plan view of a part of the same as above, Fig. 4 is a side view of the main part showing the second embodiment, and Fig. 5 is the same as the fourth embodiment. FIG. 6 is a side view of essential parts showing the third embodiment, and FIG. 7 is a block diagram of the control circuit. In the figure, 7 is a divider rod, 8 is a divider, 11 is a stress detection sensor, 14 is a detection circuit, 15c, 15d are reference setters, 16c, 16d are amplifiers, 17c, 1
7d is a switching element, and 18c and 18d are solenoid valves.

Claims (1)

[Scope of Claims] 1. A stress detection sensor is provided at an appropriate position of the weeding rod that supports the weeding seedlings, and the stress detection sensor detects the ground pressure of the weeding rod based on the stress, and the mowing is carried out based on the output of the stress detection sensor. 1. A cutting height control device for a reaping/harvesting machine, characterized in that the cutting height control device is configured to control the lifting and lowering of the cutting section. 2. The reaping harvester according to claim 1, characterized in that the ground contact area of the weeding rod in front of the machine body from the mounting position of the stress detection sensor is larger than the ground contact area of the stress detection sensor mounting part. Cutting height control device.