JP2004222667A - Ground height detecting apparatus for reaping part of harvester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the detection accuracy and durability of an apparatus for detecting the ground height of a reaping part by using a ground contact sensor. <P>SOLUTION: The ground contact sensor 21 is supported in a vertically movable manner by a gear case 40 fixed to a grass-dividing frame 16. A detection part 22 to detect the ground height of the reaping part based on the tilting angle of the ground contact sensor 21 is supported by the gear case 40. The motion of a rotary shaft 41 supporting the ground contact sensor 21 in a vertically tiltable manner is amplified and interlocked to the input shaft of the detection part 22 with a gear mechanism built in the gear case 40. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cutting unit of a harvester, comprising: a ground contact sensor that can swing up and down with respect to a weeding frame; and a detection unit that detects a height of the cutting unit with respect to the ground based on the swing angle of the contact sensor. The present invention relates to a ground height detection device.
[0002]
[Prior art]
In the harvester, a detecting device for detecting the ground height of the mowing part is provided, and when the height detected by the ground height detecting device becomes equal to or less than the set height, the mowing part is automatically raised with respect to the traveling body. The mowing unit is automatically moved up and down with respect to the traveling body so that the ground height of the mowing unit is set within a set range based on a result of detection by the ground height detecting device. The control is executed so that the mowing part of the mowing part can be prevented from plunging into the ground even when the traveling machine leans back and forth, or the mowing height of the mowing device is maintained at the set height. You may be able to work while you work.
[0003]
Conventionally, as a detecting device that detects the height of the mowing portion with respect to the ground by a ground contact sensor, for example, there has been a detecting device disclosed in Patent Document 1, for example.
That is, a detection unit is provided in such a manner that the grounding sensor is pivotally supported so as to be vertically swingable around a horizontal axis with respect to a tip end of a cutting support frame as a weeding frame, and a vertical swing displacement of the grounding sensor is detected. Some have provided a potentiometer.
[0004]
[Patent Document 1]
Published Japanese Utility Model Application No. 58-26821 (Pages 4-5, Fig. 2)
[0005]
[Problems to be solved by the invention]
If a conventional height detector is used, it is necessary to take into account the rotation angle of the input shaft, even if the input shaft is slightly rotated. It is necessary to employ a detection unit in which the detection unit main body operates over a large stroke, and the entire detection device becomes large in view of the detection unit.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to provide a compact and highly durable harvester harvester-to-ground height detector that is sensitive and accurate with respect to the swing angle of a ground sensor. It is to provide a device.
[0007]
[Means for Solving the Problems]
The configuration and operation of the invention according to claim 1 are as follows.
[0008]
〔Constitution〕
A ground contact sensor that can swing up and down with respect to the weeding frame, and a cutting unit-to-ground height detection of a harvester that includes a detecting unit that detects the ground height of the cutting unit based on the swing angle of the ground sensor. In the apparatus, a gear mechanism for increasing the speed of a rotation support shaft that supports the grounding sensor so as to be able to swing up and down with respect to the input shaft of the detection unit, and a gear case including the gear mechanism are provided. is there.
[0009]
[Action]
When the grounding sensor swings up and down to rotate the rotation support shaft, the rotation is speeded up by the gear mechanism and transmitted to the input shaft of the detection unit. As a result, even if a small detection unit is used in which the detection unit main body operates with only a relatively small stroke when the input shaft is slightly rotated, even if the ground sensor oscillates, the detection Operate over a large stroke.
[0010]
Since the gear mechanism is provided with the gear case therein, the gear mechanism can be covered with the gear case so that mud and swarf do not adhere to the gear mechanism, and detection can be performed while avoiding the occurrence of troubles such as malfunction due to mud.
[0011]
〔effect〕
Therefore, the detection unit operates over a large stroke, and can detect sensitively and accurately with respect to the swing angle of the grounding sensor. In spite of this, a small detector is used to make the entire detector compact, and it is also durable so that troubles such as detection failure due to gear mechanism malfunction due to mud or straw waste are unlikely to occur. Will be excellent.
The structure and operation of the invention according to claim 2 are as follows.
[0012]
〔Constitution〕
In the configuration according to the first aspect of the present invention, the weeding frame is provided with an engagement portion that locks to the free end side of the grounding sensor and regulates the lateral displacement of the free end side of the grounding sensor with respect to the weeding frame. is there.
[0013]
[Action]
When the aircraft is steered, the ground contact sensor may skid on the ground. At this time, even if the grounding sensor is caught by a ridge on the ground and the free end of the sensor tries to move sideways with respect to the weeding frame, the free end of the sensor is received and locked by the engaging portion of the weeding frame, and the side of the sensor greatly shifts. No longer. Unreasonable bending force is less likely to be applied to the ground sensor and the support shaft that supports the ground sensor so that it can swing up and down.
[0014]
〔effect〕
Therefore, even if the ground contact sensor slides on the ground, deformation and breakage due to an excessive bending force applied to the ground contact sensor and its support shaft hardly occur, and the durability is excellent.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
As shown in FIG. 1, a crawler-type traveling device 1 is self-propelled, and is provided with a boarding-type driving unit equipped with a driving seat 2 and an engine (not shown) located below the driving seat 2. The base end side of the pre-processing unit frame 11 of the mowing unit 10 is rotatably connected to the support unit 4 located at the front of the body frame 3 of the self-propelled body having a driving unit. At the same time, a threshing device 5 and a grain tank 6 are provided on the rear end side of the body frame 3 to constitute a combine.
[0017]
This combine harvests grains such as rice and wheat. When a hydraulic lift cylinder 8 having a cylinder rod connected to the pre-processing unit frame 11 via a link mechanism 7 is operated, this combine is lifted. The cylinder 8 swings the pre-processing unit frame 11 up and down to move the reaping unit 10 up and down to a working position in which the reaping unit 10 is lowered to near the ground and a non-working position in which the mowing unit 10 rises high from the ground. When the mowing unit 10 is set to the lowering work position and the self-propelled machine is caused to travel, the mowing unit 10 weeds a plurality of planting stems to be mowed by a plurality of planting streaks by a plurality of weeding tools 12 arranged in the lateral direction of the machine. To a corresponding one of the plurality of raising devices 13 arranged in the lateral direction of the body, and is raised and raised by raising raising claws (not shown) of each raising device 13, and is clipped by a clipper type cutting device 14. The harvesting and cutting grain culm is transported to the rear side of the machine body by a transporting device 17 including a pinching transporting device acting on the base of the stock and a locking transporting device acting on the tip side, and the threshing device 5 cuts the grain from the transporting device 17. While conveying the culm by the threshing feed chain 5a in the rearward direction of the machine body, the tip side is supplied to a handling room (not shown) for threshing, and the grain tank 6 collects and stores threshing grains from the threshing device 5. To go.
[0018]
More specifically, the mowing unit 10 is configured as shown in FIGS.
That is, a main frame 11a, which is a transmission case facing in the front and rear direction of the fuselage, the base end of which is rotatably connected to the support portion 4 of the body frame 3, and an intermediate portion is connected to the distal end of the main frame 11a. The pre-processing unit frame 11 is constituted by a transmission case 15 or the like in which the body is oriented sideways. The weeding frame 16 is extended forwardly from a plurality of portions of the support member 15a of the laterally transmitting case 15 in the lateral direction of the fuselage, and the culm is raised by a pair of neighboring weeding frames 16. 18, the weeding tool 12 is fixed to the tip of each weeding frame 16, and the raising device 13 is arranged on the side of each grain stem raising path 18. The mowing device 14 is mounted over the base end of the mowing device.
[0019]
As shown in FIG. 2 and the like, the mowing unit 10 is located slightly behind the weeding device 12 located on the outermost side of the fuselage 12 of the mowing unit 10 using the grounding sensor 21. A cutting section-to-ground height detecting device 20 for detecting the height of the ground is provided. As shown in FIG. 8, the control means 30 linked with the detecting section 22 of the cutting section-to-ground height detecting device 20 is connected to the electromagnetic operating section of the control valve 31 of the lift cylinder 8 and the cutting height provided in the operating section. The setting means 32 is linked.
[0020]
The cutting height setting means 32 is constituted by a potentiometer which can be manually operated, and variably sets the cutting height of the cutting device 14 to be maintained by cutting height control, and converts the set cutting height to an electric signal to control means. 30.
[0021]
The control means 30 is constituted by using a microcomputer, and automatically controls the lift cylinder 8 based on information detected by the cutting section-to-ground height detecting device 20 and setting information by the cutting height setting means 32. Height control is performed. In other words, when the height detected by the cutting section-to-ground height detecting device 20 deviates from the cutting height set by the cutting height setting means 32, the control valve 31 outputs a signal for operating the lift cylinder 8, thereby causing the lift cylinder 8 to operate. Is operated on the ascending side or the descending side of the mowing unit 10, so that the mowing unit 10 is raised or lowered, and the mowing unit-to-ground height detecting device 20 corresponds to the setting height set by the cutting height setting means 32. When the ground height is detected, a signal to stop the lift cylinder 8 is output to the control valve 31 to stop the lift cylinder 8 to stop the raising and lowering of the mowing unit 10. I have.
[0022]
As a result, in performing the harvesting operation, the cutting height control by the control means 30 is switched on. Then, the cutting height control for automatically raising and lowering the cutting unit 10 is performed so that the detection height of the cutting unit-to-ground height detection device 20 becomes the setting height set by the cutting height setting means 32, and the running ground is controlled. Even if the self-propelled body leans in the front-rear direction due to the unevenness and inclination of the stub, the ground height of the reaper 14 is maintained at or near the set height, and the height of the stump is at or near the set trim height. You can work in the state.
[0023]
The raising / lowering lever 34 shown in FIG. 8 is provided so as to be manually operated by the driving unit, and when operated, outputs a command to raise or lower the reaping unit 10 to the control means 30 to raise or lower the reaping unit 10. It is something to be operated. That is, the mowing unit 10 is manually moved up and down. The control means 30 switches the control valve 31 to prioritize the detection result by the reaping section-to-ground height detecting device 20 and cuts the lift slider 8 when the raising / lowering lever 34 is operated to raise or lower and input a command. The operation is performed on the ascending side or the descending side of the unit 10.
[0024]
As shown in FIG. 2 and FIG. 3, the cutting unit-to-ground height detecting device 20 is located at the most laterally outer side of the fuselage on the side opposite to the side where the driving unit is located among the plurality of weeding tools 12. Near the rear side of the weeding tool 12 to be fixed, the weeding tool 12 is fixed to a flat-shaped weeding tool support portion 16a provided to attach the weeding tool 12 to the tip of the weeding frame 16 that supports the weeding tool 12. A gear case 40, the ground sensor 21 having a lower lateral side connected to an alligator base end side of the gear case 40, and the detection unit 22 attached to an upper lateral side of the gear case 40 are configured. .
[0025]
The ground contact sensor 21 is formed of a band spring which is bent and formed so as to have a mounting piece 21c on the front end side, and to have a front end portion 21b in an intermediate portion and a grounding action portion 21a protruding downward from the rear end side. Then, in a state where almost the entirety of the grounding sensor 21 such as the grounding action part 21a and the rear end side is located directly below the weeding frame 16, the mounting part 21c is rotated as an input shaft of the gear case 40. It is supported by the gear case 40 by being integrally rotatably connected to the support shaft 41. As a result, the ground contact sensor 21 swings up and down with respect to the weeding frame 16 around the axis X of the rotation support shaft 41 in the body lateral direction.
[0026]
As shown in FIG. 6 and the like, the detection unit 22 is configured by a rotary potentiometer whose main body is fixed to a side surface of the gear case 40 and an input shaft 22a enters the inside of the gear case 40.
[0027]
As shown in FIGS. 5 and 6, a sector gear 42 in which an attachment portion 42 a is fitted to the rotation support shaft 41 of the gear case 40, and the input shaft 22 a is meshed with the sector gear 42. A gear interlocking mechanism 44 including a circular gear 43 fitted on the outside is provided inside the gear case 40. The mounting portion 42a of the sector gear 42 is integrally rotatably engaged with the rotation support shaft 41 because of the non-circular cross section of the rotation support shaft 41. The circular gear 43 is integrally rotatably engaged with the input shaft 22a because of the non-circular cross section of the input shaft 22a. The pitch circle diameter of the sector gear 42 is larger than the pitch circle diameter of the circular gear 43. Accordingly, the gear interlocking mechanism 44 increases the rotation of the rotation support shaft 41 that supports the ground sensor 21 so as to be able to swing up and down and transmits the rotation to the input shaft 22 a of the detection unit 22. Are linked to the input shaft 22a.
[0028]
Inside the gear case 40, there is provided a sensor spring 46, which is a coil spring whose coil portion is fitted around the rotation support shaft 41. The sensor spring 46 pivotally urges the rotation support shaft 41 via the sector gear 42 to swing the ground sensor 21 downward so that the ground action portion 21a of the ground sensor 21 reliably performs the ground action. It is energizing.
[0029]
As a result, the mowing unit-to-ground height detecting device 20 operates as follows.
That is, when the ground height of the mowing part 10 changes and the ground height of the weeding frame 16 changes, the ground contact sensor 21 determines that there is a ground reaction force acting on the ground action part 21a, Due to the descending force of the sensor spring 46, and further to the descending force provided by the rear end side of the ground contact sensor 21 abutting against the weeding frame 16 and the ground contact sensor 21 being elastically deformed due to the ground reaction force, The ground contact sensor 21 swings up and down with respect to the weeding frame 16 around the axis X. Then, the rotation of the grounding sensor 21 is accelerated by the gear interlocking mechanism 44 and transmitted to the input shaft 22a of the detection unit 22 to operate the detection unit 22. Thereby, the detecting unit 22 detects the ground height of the cutting unit 10 based on the swing angle of the ground contact sensor 21 with respect to the weeding frame 16, and detects the ground height of the cutting device 14 based on the detection result. The detection result is output to the control unit 30 as an electric signal.
[0030]
As shown in FIG. 3 and the like, a bent round bar material bent in a U-shape is attached to the base end side of the weeding frame 16, and an engaging portion 65 for the ground contact sensor 21 is provided. As shown in FIG. 7A, the width W1 of the engaging portion 65 at the rear end side of the grounding sensor 21 is smaller than the width W2 of the grounding action portion 21a (FIGS. 4 and 7B). The engaging portion 65 d is slidably inserted into the engaging portion 65. Even if the free end side of the ground contact sensor 21 tries to shift laterally with respect to the weeding frame 16, the engaging portion 65 is a pair of left and right vertical The side portion 65a engages with the locking portion 21d so that the sensor free end side does not move more than the stroke in which the free end of the sensor moves due to the interval between the vertical side portions 65a being larger than the width W1 of the locking portion 21d. The lateral displacement is regulated.
[0031]
That is, even if the ground sensor 21 slides on the ground and is caught on the raised portion, the engaging portion 65 receives and locks the free end side of the ground sensor 21 so that a large twist is not easily generated in the ground sensor 21. . Thus, even if the ground contact sensor 21 slides on the ground, an excessive bending force or the like is not applied to the ground contact sensor 21 and the rotating shaft 41.
[0032]
[Another embodiment]
The lift cylinder 8 is mounted on the mowing unit 10 based on the detection result of the mowing unit-ground height detecting device 20 so that the ground height of the mowing device 14 is within the set range regardless of the longitudinal inclination of the self-propelled body as in the above-described embodiment. The lift cylinder 8 is automatically operated on the ascending side or the descending side of the lift cylinder 8 on the basis of the detection result of the mowing portion-to-ground height detecting device 20 so as to prevent the weeding implement 12 from sticking into the ground. The present invention can also be applied to a case in which is automatically operated on the ascending side of the mowing unit 10.
[0033]
The reaping unit-to-ground height detecting device 20 is disposed behind the weeding implement 12 located at the most lateral side of the body opposite to the driving unit as in the above-described embodiment, and is also located at the most lateral end of the driving unit side. It may be arranged behind the weeding implement 12 or behind the weeding implement 12 located on the inside of the fuselage rather than the weeding implements 12 located at both lateral ends thereof.
[0034]
The present invention can also be applied to work vehicles for harvesting various crops such as onions and carrots in addition to combine harvesters, and these work vehicles and combines are collectively referred to as harvesters.
[Brief description of the drawings]
FIG. 1 is a side view of a front portion of a combiner. FIG. 2 is a perspective view showing a main frame of a cutting unit and a ground height detecting device. FIG. 3 is a side view of a cutting unit and ground height detecting device. FIG. 5 is a cross-sectional view of a gear interlocking mechanism. FIG. 7A is a cross-sectional view of a weeding frame at an engaging portion disposed portion. (B) is a cross-sectional view showing the width of the grounding sensor in the grounding action part. [Fig. 8] Block diagram [Description of reference numerals]
Reference Signs List 10 Cutting unit 16 Weeding frame 21 Grounding sensor 22 Detecting unit 22a Input shaft 40 of detecting unit Gear case 41 Rotating support shaft 44 Gear mechanism 65 Engaging unit

Claims (2)

A grounding sensor that can swing up and down with respect to the weeding frame, and a detecting unit that detects a ground height of the cutting unit based on a swing angle of the grounding sensor. A device,
A harvester comprising: a gear mechanism for increasing the speed of a rotation support shaft that supports the ground sensor so as to be able to swing up and down with respect to the input shaft of the detection unit; and a gear case containing the gear mechanism. Reaper height detector. 2. The harvester according to claim 1, wherein the weeding frame is provided with an engagement portion that locks on a free end side of the grounding sensor to restrict lateral displacement of the weeding side of the grounding sensor with respect to the weeding frame. 3. Cutting part-to-ground height detection device.

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