JPS6033780Y2 - Cutting height control device for reaping harvester - Google Patents

Description

[Detailed description of the invention] This invention is a cutting height that maintains the height above the ground of the cutting section of a harvester such as a combine at a predetermined value so that the cutting height of the standing stem rod can always be kept constant. This relates to a control device.

In order to harvest the erect hair culms planted in a field, it is preferable to bring the cutting blade close to the cutting ground and lower the cutting height to the extent that the durability of the cutting blade is not impaired.

For this reason, in the past, a bridge-like ground sliding body was attached to the lower part of the reaping section so that it could be raised and lowered, and the means for raising and lowering the reaping section was made by utilizing the relative movement between the ground sliding body and the reaping section frame due to the unevenness of the reaping ground. Through control, the height of the cutting section above the ground was maintained constant.

However, when a bridge-like ground sliding body is installed in this way, mud or weeds, etc. adhere to the ground sliding body, making it difficult to move up and down smoothly, and in extreme cases, it becomes tangled with weeds. This does not mean that the ground sliding body is locked and does not perform the intended detection function, but that its durability is deteriorated due to excessive force from weeds, etc., and when the aircraft is moved backwards, the rear end of the ground sliding body There was a risk of damage due to excessive force being applied to the parts.

In addition, conventionally, the movement of the ground sliding body was detected using microswitches, etc., which made it impossible to make delicate adjustments. There was a drawback that the desired control effect was not achieved.

The present invention was devised to eliminate the above-mentioned drawbacks, and its purpose is to curve the ground sliding body made of an elastic body facing backward from the lower part near the front end of the reaping part downward. The rear end is slidably locked in a guide groove formed in the front-rear direction of the weeding rod, and the above-mentioned ground sliding body detects the ground height of the reaped portion through deformation due to ground contact pressure. By installing a strain sensor and a control circuit that controls the raising and lowering of the cutting section according to the output of the strain sensor, it is possible to eliminate malfunctions caused by mud or weed entanglement, and at the same time to smoothly adjust to uneven ground conditions. The machine moves up and down, and even when the machine moves backwards, it does not apply excessive force and its durability is greatly increased.In addition, by sensing near the front end of the cutting section, it is possible to properly cut the grass. It is an object of the present invention to provide a cutting height control device for a reaping/harvesting machine that can feed a cutting blade in a height state.

The structure of the present invention will be described with reference to the embodiment shown in the drawings. Reference numeral 1 denotes 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 and a A reaping section 4 is attached to the front part so as to be movable up and down.

The reaping section 4 has a reaping section frame 5 mounted on the body frame 1 so as to be able to rise and fall freely by a lifting device (not shown).
A cutting blade 6 attached to the reaping section frame 5, a weeding rod 7 extending forward from the reaping section frame 5 along the ground, and a weeding rod attached to the tip of the weeding section 7. 8, a narrow guide 9 extending outward from one side of the body from the tip of the dividing rod 7, a culm combing device 10, and the like.

Further, a horizontal horizontal shaft 11 is welded and fixed to the front end of the above-mentioned weeding rod 7, and a guide groove 12 along the front-rear direction is behind the horizontal shaft 11.
is formed.

Then, the front end of the ground sliding body 13 made of an elastic body curved downward is rotatably attached to the horizontal horizontal shaft 11, and the guide pin 14 attached to the rear end of the ground sliding body 13 is attached. It is fitted into the guide groove 12 so as to be slidable back and forth.

Furthermore, a compression spring 15 is installed between the rear end of the guide groove 12 and the guide pin 14 to provide resistance to the rearward sliding of the guide pin 14 when the guide pin 14 slides beyond a certain level. As a result, when the ground sliding body 13 in contact with the ground is lifted upward and bent beyond a certain level, the stress on the ground sliding body 13 increases rapidly.

In addition, the ground sliding body 13 made of an elastic body as described above
is equipped with a strain sensor 16 made of a strain gauge or the like that can detect the height of the reaping section 4 above the ground by deformation due to its contact pressure with the ground.
The output is inputted to a control circuit 17 shown in FIG.

The control circuit 17 is connected to a detection circuit 18, which is composed of an amplifier, etc., and whose output value increases as the deformation of the ground sliding body 13 detected by the strain sensor 16 increases. Reference setting device 19u for rising
and a descending reference setter 19d.

Both of these two-stage regulators 19u and 19d are variable type, and when the output value of the detection circuit 18 is higher than the rising reference value set by the rising reference setting device 19u, the rising riser 20u The lifting electromagnetic valve 22u is opened via the switching element 21U, and a hydraulic lifting device (not shown) is operated to lift, thereby raising the reaping section 4.

Further, when the output value of the detection circuit 18 is lower than the lowering reference value set by the lowering reference setting device 19d, the lowering solenoid valve 22d is opened via the lowering amplifier 20d and the switching element 21u, and the reaping section is opened. 4 is lowered and the output value of the detection circuit 18 is within the range of both the reference values,
Both electromagnetic valves 22u and 22d are closed to maintain the hydraulic lifting device in a stopped state.

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

Next, the operation of the present invention constructed as described above will be explained.

When the ground sliding body 13 is brought into contact with the ground, the smaller the ground height of the reaping section 4 is, the greater the amount of deflection of the ground sliding body 13 becomes.
The output amount of the detection circuit 18 grounded to the strain sensor 16 increases.

Therefore, the output value of the detection circuit 1B changes depending on the height above the ground of the reaping section 4, that is, the cutting height of the cutting section 4, so when this output value is within a predetermined level, the cutting height is It is determined that it is appropriate.

Now, the output value of the detection circuit 18 is increased by the reference setting device 19u.
If it is higher than the rising reference value set in , the rising amplifier 20u is driven, and the rising solenoid valve 22u is opened via the switching element 21u.

Therefore, the reaping section 4 is raised by a hydraulic lifting device (not shown).

Such raising of the reaping section 4 continues until the output value of the detection circuit 18 becomes equal to or less than the reference value for raising, so that the height of the reaping section 4 above the ground (cutting height) is returned to the set value.

Further, when the output value of the detection circuit 18 becomes lower than the lowering reference value, that is, when the height of the reaping section 4 above the ground becomes higher than the permissible value, the lowering amplifier 20d is driven and the switching element Since the lowering electromagnetic valve 22d is opened via 21d, the reaping section 4 is lowered to a predetermined position.

Furthermore, since the ground sliding body 13 of the present invention is provided near the front end of the reaping section 4, while the mowing blade 6 position is moving to the position where a change in the ground contact pressure of the sliding section 13 is detected, the reaping section 4 is automatically adjusted up and down, so the cutting height can always be accurately regulated.

In addition, the rear end of the curved ground running body 13 is slidably engaged with the guide groove 12 of the weeding rod 7, so weeds and straw do not get stuck, and the ground running body 13 moves smoothly according to the irregularities of the ground. It moves up and down smoothly, and even when the aircraft moves backward, no excessive force is applied to the rear end of the ground sliding body 13, allowing it to be used for a long period of time without damage.

In this way, the cutting height is automatically controlled to a predetermined value according to the output from the strain sensor 16. However, in wet fields, for example, the ground sliding body 13 is buried in the ground and the detection circuit 18
The error between the output value and the actual cutting height may become large.

Therefore, in such a case, each standard setting device 19u
, 19d to lower each reference value by an amount corresponding to the amount of reduction in stress, the cutting height can be maintained at a predetermined value even if the ground sliding body 13 is buried in the ground.

Furthermore, in order to change the cutting height, each reference value may be changed in the same manner as described above.

The present invention is applicable not only to combines but also to general harvesting machines having a reaping section.

In short, the present invention is a reaping harvester in which a reaping section is attached to the front part of the machine so that it can be raised and lowered. The rear end is slidably locked in a guide groove formed in the front-back direction of the weeding rod, and the above-mentioned ground sliding body has a structure that adjusts the height of the cutting section above the ground through deformation due to contact pressure with the ground. Since a strain sensor is provided to detect the strain, and a control circuit is provided to control the raising and lowering of the reaping section according to the output of the strain sensor, this method is more effective than the conventional case of simply detecting the amount of raising and lowering of the bridge-like sliding body. Since the ground sliding body is an elastic body, its displacement position (stress change) can be large, and therefore the mowing height adjustment range can be widened. Since it is slidably attached to the grass divider, it moves up and down smoothly according to the unevenness of the ground, making it difficult for mud to get stuck or weeds to get tangled. A particularly large force is not applied to the rear end, so that a constant detection performance can be maintained at all times, and the reliability of cutting height control can be significantly improved.

In addition, even if the tip of the weeder penetrates into the ground and is subjected to excessive force, the reaping section will be raised and will not be damaged or permanently deformed, and the durability of the detection section will be improved, so it can be used for a long time. The mowing height can be automatically controlled with high precision.Furthermore, since the main ground sliding body is installed near the front end of the cutting section, it is possible to automatically control the mowing height to the position where a change in the ground contact pressure of the ground sliding body is detected. While the cutting blade is moving, the reaping section is automatically adjusted up and down, which provides extremely useful practical effects.

[Brief explanation of drawings]

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.
2 is a side view of the main parts of the first embodiment, FIG. 3 is a side view of the same operating state, and FIG. 4 is a block diagram of the control circuit. In the figure, 2... threshing section, 4... reaping section,
7... Curved grass rod, 13... Ground sliding body, 16.
...Distortion sensor, 17... Control circuit.

Claims (1)

[Scope of utility model registration request] In a reaping harvester with a reaping section attached to the front part of the machine so that it can be raised and lowered, a ground sliding body made of an elastic body facing rearward from the lower part near the front end of the reaping section is curved downward, and the rear end is bent downward. The ground sliding body is slidably engaged with a guide groove formed in the front-rear direction of the weeding rod, and a strain sensor is installed on the ground sliding body to detect the height of the cutting section above the ground through deformation due to contact pressure with the ground. 1. A cutting height control device for a reaping harvester, characterized in that a control circuit is provided for controlling the elevation of a cutting section in accordance with the output of a sensor.