JPS5851698Y2 - Combine harvester cutting height detection device - Google Patents

Description

[Detailed description of the invention] This invention relates to a cutting height detection device that detects the cutting height of a husk in a combine harvester that reaps a planted culm while traveling in a field and threshes the cut culm. It is.

As a cutting height detection device for a combine harvester, a device with a structure in which a sensor switch in a switch box is actuated by a sensor arm that is rotatable around a horizontal fulcrum axis and slides into contact with the field surface is already known, but the conventional one Generally, the sensor arm in the field is formed in such a shape that only one end thereof is slightly curved upward, and the free end side tends to get caught in obstacles such as mounds of mud or stumps on the field, and it also prevents the sensor arm from reaching the field. The sliding properties of the rollers are not always good, and there is a problem that they are easily damaged due to getting caught on obstacles or sliding resistance against the field.

Furthermore, the long and narrow sensor arm formed by the rod is prone to lateral vibration, which reduces detection accuracy.

One purpose of this invention is to provide a new cutting height detection device for combine harvesters, which eliminates the above-mentioned problems by devising the shape and support method of the sensor arm. It is in.

Next, as the sensor switch for cutting height detection, there is a sensor switch for the cutting height display device that displays the cutting height during cutting work to inform the operator, and a sensor switch for the cutting height display device that displays the cutting height during cutting work and informs the operator. A sensor switch for an automatic cutting height adjustment device for automatic adjustment is conventionally known.The sensor switch of the latter automatic cutting height adjustment device is supported so that it can be raised and lowered, and the cutting height is adjusted by adjusting its vertical position. Although it is known to set such a sensor switch, there has never been an example in the past in which a dual-purpose or dual-system sensor switch as described above is directly actuated by a single sensor arm.

However, if the two series of sensor switches can be operated directly by a single sensor, not only will the structure of the cutting height detection device be simplified, but the detection accuracy of each series of sensor switches will be increased by direct operation by the sensor. While the two series of sensor switches are used for the final purpose of obtaining the optimum cutting height, mowing is performed while checking the cutting height displayed on the cutting height display device. This will prevent a situation where the cutting height differs greatly between when the height is adjusted manually and when the cutting height is dynamically controlled by an automatic adjustment device.

Another purpose of this invention is to achieve the above-mentioned purpose by using a mechanism to stably support the sensor arm, and by using the sensor switch of the cutting height display device and automatic cutting height adjustment. The sensor switch of the device is directly actuated in a stable manner by a single sensor, and the advantages described above are exhibited.

A novel cutting height detection device for a combine harvester is provided.

Regarding the illustrated embodiment, the configuration of the mowing height detection device for a combine harvester according to the present invention will be explained. As shown in FIG. The planted culm is divided by the divider 3 at the lower front end, and the planted culm is pulled up by the culm lifting device 4 in the cutting section 2, and the planted culm is removed from the plant by the cutting blade 5. The harvested husk culm is harvested and transported in the direction of the threshing section 6, and the cut husk culm is transported rearward by the foot chain 7 on the side of the threshing section 6, and the tip side of the husk is transported into the threshing section 6. In a combine harvester configured to supply and thresh grain, this invention is implemented as follows.

That is, as shown in FIG. 1, the divider 3 is attached to the tip of a divider attachment rod 8 provided on the bottom side of the reaping section 2 along the longitudinal direction of the machine body, but it is clearly shown in FIG. As shown in FIG. 2, the sensor arm 10 is supported at its rear end by a divider mounting rod 8 at one end so as to be rotatable around a horizontal fulcrum shaft 9, and extends along the front-rear direction. An arc-shaped sensor arm 10 is arranged so as to be in sliding contact with the field surface on the lower surface side of the approximately center in the length direction on the outer side of the divider mounting rod 8 described above.

Also, as clearly shown in FIG. 2, a switch box 11 is fixed to the divider mounting rod 8 above the sensor arm 10, and the divider mounting rod 8 is attached to the bottom wall of the switch box 11. An operating rod 12 is inserted into a through hole formed at an exceptional position and guided to the switch box 11 so as to be movable up and down.
It is installed across the inside and outside of the building.

The lower end of the operating rod 12 is pivotally supported 12a on the upper surface of the sensor arm 10 at a substantially central position in the length direction of the sensor arm 10.

Inside the switch box 11, a low mowing detection switch 14A and a standard mowing detection switch 14B are arranged vertically on one side of the operating rod 12, and two sensor switches are provided on the other side of the operating rod 12. 15A and 15B are arranged one above the other with an interval d between them.

Among these switches 14.15, switch 14A,
The switch 14B is selectively turned on when pressed by the operating protrusion 12a on one side of the operating rod 12, which is raised and lowered as the sensor arm 10 moves up and down.
A and 15B are the operating protrusions 12 on the other side of the operating rod 12.
When pressed, it is selectively turned on.

In addition, the switches 15A and 15B are particularly fixed to a support plate 16 that is separate from the box 11, and are screwed into a nut 17 on the top wall of the switch box 11 at a threaded portion 18a. The upper end of the support plate 16 is engaged with the handle 18, which faces the switch, using the pin 16a and the spring 16b, and the height of the switches 15A, 15B together with the support plate 16 is adjusted by rotating the handle 18. Changes have been made so that they can be adjusted.

Switches 14,15 are inserted into a control circuit as shown in FIG.

That is, first, the switches 14A and 14B are connected in series with the low mowing indicator lamp 19A and the standard mowing indicator lamp 19B, respectively, and then each set of switches 14 and indicator lamp 19 is connected to both ends of the battery B that constitutes the power source. The display lamps 19A and 19B are connected to each other so that each indicator lamp 19A, 19B is selectively turned on by closing each switch 14A, 14B.

The indicator lamps 19A and 19B are installed in the operation column 20a (see FIG. 1) in front of the pilot's seat 20 of the combine harvester shown.

As described above, the switches 14A and 14B are used as sensor switches for a cutting height display device.

Next, the switches 15A and 15B are connected in series with the solenoids 21A and 21B, respectively, and the switches 15 and the solenoids 21A and 21B of each set are connected as sensor switches of the automatic cutting height adjustment device. 21
B is connected to both terminals of the battery B, and by closing each switch 15A, 15B, each solenoid 21A,
21B is selectively energized.

As shown in FIG. 4, each switch 15A, 15B
Manual switches 22A and 22B are provided in parallel with the
These manual switches 22A and 22B are also installed on the operation column 20a.

In FIG. 3, S is a power switch. The solenoids 21A and 21B described above have the following functions.

That is, FIG. 4 shows a hydraulic circuit for controlling the supply and discharge of hydraulic oil to and from the lift cylinder 23 for raising and lowering the reaping section 2 of the combine harvester shown in the figure. It is connected to an oil supply circuit 27 that supplies hydraulic oil at the hydraulic pressure set by the pressure regulating valve 26 toward the lift cylinder 23, and a tank circuit 28 that discharges hydraulic oil from the lift cylinder 23 direction to the oil tank 24.
A three-position electromagnetic switching valve 29 for controlling hydraulic oil supply and discharge is provided, and the solenoids 21A and 21B are as shown in the figure.
It is a solenoid attached to the electromagnetic switching valve 29.

Then, the electromagnetic switching valve 29 connects the oil supply circuit 27 to the tank circuit 2.
8 and both oil chambers 23 of the lift cylinder 23.
a, 23b are blocked and the lift cylinder 23 is maintained in a constant expansion/contraction state, and a lifting position U is assumed when the solenoid 21A is energized. The oil supply circuit 27 is connected to the expansion oil chamber 23a of the cylinder 23, and the contraction oil chamber 23b of the cylinder 23 is connected to the tank circuit 28.
a lifting action position U where the lift cylinder 23 is extended and the reaping section 2 is raised; and the solenoid 21
This is the downward action position taken when B is energized, and the oil supply circuit 27 is connected to the reduction action oil chamber 23 of the cylinder 23.
b and extension oil chamber 23 of the same cylinder 23.
a to the tank circuit 28, and the lift cylinder 2
3 and a lowering position where the reaping section 2 is lowered.

Next, to explain the operation, the state shown in Fig. 2 is as follows.
The state in which the standard cutting height is set and the operating rod 1 is
The standard mowing detection switch 1 is pushed by the operating protrusion 12a of 2
4B is closed and the standard mowing indicator lamp 19B is lit, so that the operator in the driver's seat 20 can immediately visually confirm that the mowing height is set to the standard mowing height.

In addition, when the reaping section 2 is raised, the sensor arm 10
is relatively rotated downward around the fulcrum shaft 9, the operating rod 12 is lowered, and the operating protrusion 12a thereon engages the switch 14B.
The display lamp 19A is out of position and lowered.
, 19B are both off, but from the state shown in the figure, for example, when the rice has a large lodging and needs to be harvested at a low mowing height, the reaping unit 2 may be lowered slightly to lower the mowing height. When set, the operating rod 12 is raised and the operating protrusion 12a on it pushes the low mowing detection switch 14A, closing the switch 14A and lighting the low mowing indicator lamp 19A. , it is immediately visible that the cutting height is set to a low cutting height.

For example, if the standard cutting height is set and the rice is heavily lodging in a part of the field, the above-mentioned manual switch 22B may be manually closed and the solenoid The electromagnetic switching valve 29 is brought to the lowering position by the excitation of 21B, the lift cylinder 23 is reduced and the reaping section 2 is lowered, and the lowering of the reaping section 2 to the low mowing height is indicated by the low mowing indicator lamp 19A. Check it by lighting it,
Turn off the switch 15B and return the electromagnetic switching valve 29 to the neutral position N.
In the large part of the rice lodging, the cutting is carried out at a low cutting height, and once the rice has passed the large part of the rice lodging, the other manual switch 22A is temporarily turned off and the standard mowing indicator lamp 19B lights up. The cutting height can be freely controlled without looking at the tip of the divider 3, such as raising the cutting part 2 to a maximum height and returning it to the standard cutting height.

Next, to explain the function of the sensor switches 15A and 15B, when the standard cutting height is set as shown in FIG.
When the operating protrusion 12b on the operating rod 12 is located inside, both sensor switches 15A and 15B are off and solenoids 21A and 21B are both demagnetized.
Therefore, the electromagnetic switching valve 29 assumes the neutral position N, and the lift cylinder 23 is held at a constant expansion/contraction position.

In this state, the reaping unit 2 moves up and down due to the ups and downs of the field, and when the cutting height becomes excessive, the sensor switch 15B is turned on by lowering the operating rod 12, and conversely, the cutting height becomes too small. When the operating rod 12 rises, the sensor switch 15A is turned on.

Therefore, when the cutting height is too high, the solenoid 21B is energized and the electromagnetic switching valve 29 is temporarily brought to the lowering position, and conversely, when the cutting height is too small, the solenoid 21A is energized and the electromagnetic switching valve 29 is temporarily raised. Lift cylinder 2 is brought into working position U until it returns to the standard cutting height during interval d.
The mowing height is automatically adjusted by raising and lowering the mowing section 2 by the telescopic operation of step 3.

That is, the sensor switches 15A and 15B are configured as sensor switches of an automatic cutting height adjustment device.

When setting a low mowing height in the reaping section 2, both sensor switches 15A and 15B are raised to levels L1 and L2 in FIG. 2 by operating the bundle 18, and the levels L1. Both sensor switches 15A, 15 at L2
B detects whether the cutting height is too small or too large as described above, and automatically adjusts the cutting height as described above.

Note that the operating rod 12 is connected to the switches 15A and 1.
It can also be used as a connection terminal for 5B.

As is clear from the above description, the mowing height detection device for a combine harvester of this invention has a sensor arm 10 that is formed in a downwardly convex substantially arc shape and that slides into contact with the field surface on the lower surface side of the substantially central portion in the length direction. is rotatably supported at one end around the horizontal fulcrum shaft 9 and is provided along the front and back direction, and is an operating rod 12 for operating a sensor switch installed inside the switch box 11. An operating rod 12, which is guided so as to be vertically movable and is provided so as to straddle the inside and outside of the switch box 11, is pivoted at its lower end to the upper surface of the sensor arm 10 at a substantially central position in the length direction of the sensor arm 10. Furthermore, a plurality of sensor switches 14A and 14B of a cutting height display device are installed in the switch box 11 as the sensor switches.
are provided on one side of the operating rod 12, and sensor switches 15A and 15B of the automatic cutting height adjustment device are arranged vertically on the other side of the operating rod 12, respectively, and the automatic cutting height adjustment device described above is provided. The switch box 11 is equipped with an operating tool 18 that supports the sensor switches 15A and 15B so as to be movable up and down within the switch box 11, and allows the sensor switches 15A and 15B to be raised and lowered to change their vertical positions. It is characterized by the following advantages:

That is, the mowing height detection device of this invention has a sensor arm 10 that slides in contact with the field surface and has a substantially circular arc shape convex downward, and the sensor arm 10 is supported at one end so as to be movable up and down. In order to slide the sensor arm 10 into sliding contact with the field surface on the lower surface side of the approximately center in the length direction, the free end side of the sensor arm 10 is made large so that it is located approximately at the same level as the horizontal fulcrum shaft 9 that supports the sensor arm 10. Since the sensor arm 10 is lifted upward, the possibility that the free end side 1 of the sensor arm 10 gets caught on an obstacle on the field is extremely reduced. Even if the field is changed, it almost always contacts the field surface smoothly on the lower surface side of the central part in the length direction, where the bending dust relative to the field surface is large, and the sliding contact with the field surface is good. This makes it difficult for the sensor arm 10 to be damaged.

In addition, the mowing height detection device of this invention has a sensor arm 10.
The actuating rod 12 is used to operate the sensor switches 14 A, 14 B, 15 A, and 15 B in the switch box 11 according to the vertical movement, and the actuating rod is guided by the switch box 11 in a vertically movable manner. 12 is placed at the lower end of the sensor arm 12 on the upper surface side of the central part in the longitudinal direction where the sensor arm 10 touches the ground, and is pivoted to the sensor arm 10, and conversely, the operating rod 12 prevents the sensor arm 10 from swinging laterally at the central part. Since the sensor arm 10 is guided in this manner, the sensor arm 10 moves up and down in a straight line without causing lateral vibration, and a decrease in detection accuracy due to lateral vibration of the sensor arm is avoided, thereby increasing detection accuracy. .

As mentioned above, the actuating rod 12 stably supports the sensor arm 10 to improve detection accuracy, and therefore the actuating rod 12, which can be moved up and down by the sensor arm 10 without causing sideways vibration, is used to connect the two series in the switch box 11. The mowing height detection device of this invention is designed to operate the sensor switches 14A and 14A of the cutting height display device and the sensor switches 15A and 15B of the automatic cutting height adjustment device. Two series of sensor switches are directly activated by a single sensor such as a sensor arm 10 and an operating rod 12 that detect the cutting height, one for displaying the cutting height and one for automatically adjusting the cutting height. Not only has the structure of the device for operating the two series of sensor switches for use and use been simplified, but the detection accuracy of each series of sensor switches has been improved by direct activation by sensors 10 and 12, and the mowing height display has also been simplified. The detection criteria for cutting height can be determined depending on whether the cutting height is adjusted manually while checking the cutting height displayed on the device or when the cutting height is dynamically controlled using an automatic adjustment device. It is assumed that there will be no discrepancy in cutting height since there is no difference in cutting height.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a combine harvester equipped with an embodiment of this invention, Fig. 2 is a longitudinal cross-sectional side view of the same embodiment, Fig. 3 is a circuit diagram of an electric circuit in the same embodiment, and Fig. 4 is the same implementation. FIG. 3 is a circuit diagram of a hydraulic circuit in an example. 2... Reaping part, 8... Tavern mounting rod, 9... Fulcrum shaft, 10... Sensor arm, 11... Switch box , 12...
...Operating rod, 14A...Low mowing detection switch, 14B...Standard mowing detection switch, 15A
, 15B...Sensor switch, 16...
...Support plate, 17... Nut, 18...
・Bundle, 19A...Low mowing indicator lamp, 1
9B...Standard mowing indicator lamp, 20...
・Cockpit, 21A. 21 B...Solenoid, 22 A, 22 B
...Manual switch, 23...Lift cylinder, 29...Solenoid switching valve.

Claims (1)

[Claims for Utility Model Registration] A sensor arm 10 that is formed into a substantially circular arc shape convex downward and slides into contact with the field surface on the lower surface side of the substantially central portion in the length direction is rotated around a horizontal fulcrum shaft 9 at one end thereof. An operating rod 1 that is movably supported and provided along the front and rear direction, and is used to operate a sensor switch installed inside the switch box 11.
2, the operating rod 12, which is vertically movably guided by the switch box 11 and is provided astride the interior of the switch box 11, is connected to the sensor arm 1 at its lower end.
A plurality of sensor switches 14A and 14B of the cutting height display device are mounted on the upper surface of the sensor arm 10 at approximately the center position in the length direction of the sensor arm 12a, and are mounted in the switch box 11 as the sensor switches. On one side of the rod 12, there is also a sensor switch 1 of the automatic cutting height adjustment device.
5 A and 15 B are arranged vertically on the other side of the operating rod 12, and sensor switches 15 A and 15 B of the automatic cutting height adjustment device are supported in the switch box 11 so as to be movable up and down. and the sensor switch 15A. The switch box 11 is equipped with an operating tool 18 that can raise and lower the switch 15B and change its vertical position.
A feature of the combine harvester is the cutting height detection device.