JPS59109110A - Apparatus for regulating reaming height of combine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for detecting the cutting height (hereinafter referred to as margin) from a sensor that detects the cutting height.
Continued on next page. ) This invention relates to a combine harvester that automatically adjusts the cutting height using a hydraulic device that responds to commands.

Conventionally, there was an adjustment device for this Yuzu in which a detection device for detecting the height above the ground was located behind the cutting blade.
Since reaping and threshing work is normally performed when the machine is moving forward, the cutting blade moves forward before the detection device. Therefore, with such a conventional structure, if there is a protrusion in the field, the cutting blade will collide with the protrusion in the field, or it will sink into the field and cut the mud, causing significant wear on the cutting blade. There was a drawback that it could be damaged or damaged.

On the other hand, if there is a concave part, these four parts will be detected after the cutting blade has cut off the culm, which results in a high cutting and it is extremely difficult to maintain a constant cutting height. was there. In addition, conventionally, there was a device in which the cutting blade was fully positioned forward f from the starting end of the lifting device, but with such a structure, when the grain culms are lodging and intertwined, the lodging grain Due to the influence of the culm, it is not possible to accurately detect the height above the ground relative to the field, which also has the disadvantage that the cutting height cannot be maintained constant.

Furthermore, regarding the detection device itself, conventionally it was a contact type using a sensing sled body, so in soft fields, the sled body may sink into muddy soil, causing malfunction, or Since it is pressed against the field, it has the disadvantage of being prone to breakdowns, and in addition, there are various points that need improvement, such as the complicated operation of setting the cutting height.

The present invention eliminates these conventional drawbacks, and provides a practical mowing height that allows relatively simple and easy cutting height setting operations, and allows stable cutting height adjustment at all times with fewer failures. The purpose is to provide an adjustment device.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, ``■'' is a combine harvester that reaps and threshes the planted grain culm, and 2 is a pulling device installed obliquely at the front of the machine, which raises the planted grain culm to a substantially upright position.

Reference numeral 3 denotes a cutting blade that performs a cutting action at the stock base of the planted grain culm raised by the pulling device 2, and this cutting blade 3 is located rearward from the lifting start end of the lifting device 2. 4 is a conveyance device for conveying the cut culms. Next, 5 is a hydraulic cylinder, and the operation of this hydraulic cylinder 5 moves the pre-processing section 7, which includes the above-mentioned lifting device 2, cutting blade 3, conveyance device 4, etc., toward the main body of the machine about the pivot point A. The cutting height can be changed by raising and lowering the cutting height.

8 is an ultrasonic type non-contact height detection device above the ground, which includes a transmitter that transmits ultrasonic waves, and a voltage that is generated by receiving the reflected waves of the transmitted ultrasonic waves that bounce back from the field. Uke 1d
It has a section and outputs a detection voltage v6. In particular, in the present invention, the detection device 8 is located between the lifting start end of the lifting device 2 and the cutting blade 3 in side view.

Note that this detection device 8 has a lower detection voltage 8 as the height above the ground is lower.
This is to make sure that the value is high.

In addition, as a non-contact type detection device, instead of the ultrasonic type described above, a capacitive method (for example, a voltage is applied to the field and the sensing body through a chain hanging over the field, and the capacitance change between the field and the sensing body is detected) It is possible to use a photoelectric type (converting to a voltage value) or a photoelectric type.

FIG. 2 is a block diagram showing the operating sequence of cutting height adjustment, in which the signal detected by the detection device 8 is transferred to the comparison circuit Com.
p, - Cam p 11, where it is compared with a preset signal (setting value), a cutting height adjustment signal is generated through this comparison circuit, and this signal is sent to the solenoid valve 9 of the hydraulic device 6, which will be described later. The hydraulic cylinder 5 is actuated to adjust the cutting height.

FIG. 3 shows an electric circuit that operates the stain solenoid valve 9 based on the signal detected by the non-contact detection device 8, and a hydraulic system that adjusts the cutting height as the solenoid valve 9 operates. #6
FIG. In the figure, first and second comparison circuits Comp, -Comp.

The detection voltage ■ detected by the non-contact detection device 8 is applied to the positive terminal of the , and the constant voltage ■s is applied to the negative terminal of the
Voltages v1 and -2 obtained by dividing t by variable resistors 1t1 and R2 are applied. In addition, in this embodiment, the voltage 1 applied to the first comparator circuit C0IiIp1 divided by the variable resistor l(1) is the same <'M'f
2nd comparator circuit Cornp voltage-divided by R2 (variable resistor)
Applied voltage to 2■ Be smaller than 2 (■, <VB)
It is set in advance. Further, the comparison circuit comp
, .C0rfIp2 are used which operate to generate an output voltage only when the voltage applied to the positive side terminal is higher than the negative side terminal. Therefore, for example, the first comparison circuit C
At θInp, an output voltage is generated when the voltage V8 applied to the positive terminal from the detection device 8 is higher than the voltage \/1 divided by the variable resistor R1.

On the other hand, in the hydraulic system 6, when a cutting height adjustment signal is applied to one of the solenoid valves 9, solenoid SQL and 5QL2, the oil path is switched, the hydraulic cylinder 5 is operated, and the pre-processing section 7 is pivoted. The mowing height can be changed by raising and lowering the main body of the machine with A as the center [7]. -1 Next, the operation of the above embodiment will be explained.

Ultrasonic waves are emitted from the transmitting section of the ground height detecting device 8 toward the field, and the reflected waves are received by the receiving section to generate voltage VLI, and this detected voltage v8 is sent to the first and second comparator circuits C.
o, np, −Apply to the positive side terminal of Comp2. On the other hand, a constant voltage vst is connected to the variable resistor R on the negative side terminal.

Voltages 1 and v2, which are divided by R2 and R2, are applied. (As mentioned above, in this embodiment, it is determined that V<VB.) This range from vl to v2 (V + <Vs< V 2 ) is determined by the ground height detection device 8 as described later. The setting operation of this divided voltage V1 and ■2 is the dead zone of variable resistor 1 (
This can be easily done by changing 1 and I(2).

The relationship between the detected heavy pressure applied to the comparator circuit Comp, (,: Omp2) and the divided voltages v1 and VB is V
+<VB-JIK pressure Vs.

■ V, < detection voltage V 3 < ■ 2, ■ Detection voltage VB<V, <VB, The three cases will be explained below.

■ If V + < V 2 < detection voltage ■, that is,
If the height above the ground is too low, the first and second comparator circuits comp, ・Comp2 output voltage is generated, and the transistor 'rrl・JN r
Since the relays Ry and Ry2 are energized through 2, the relay switch SWI is opened and the other relay switch SW2 is opened.
is closed. Therefore, the solenoid SOL of solenoid valve 9! is energized by the power source E to switch the oil path, and the pretreatment section 7 is raised relative to the main body of the machine about the pivot point A by the operation of the hydraulic cylinder 5. As this rise continues, the detection voltage ■θ detected by the height above the ground detection device 8 decreases, but this detection voltage v8 is V, <VB
<VB, the rise of the preprocessing section 7 will be stopped for the reason described in the next section (2).

(2) When V<detection voltage VB<■2, that is, when the height above the ground is within the preset range (insensitive/within the meter), the second comparator circuit COMP2 is connected to the negative terminal. Since the applied voltage (2) is larger than the detection voltage V.j applied to the positive terminal, no output voltage is generated. Therefore relay tty
2 is not energized and the relay switch SW2 remains open. On the other hand, the first comparison circuit Com p 1 has Vs
> V, so an output voltage is generated. Therefore, relay Ry is energized via transistor R1, and relay switch SW is opened.

Therefore, since both the relay switches Sv■1 and 5VV2 are opened, the electromagnetic valve 9 is not energized and the hydraulic cylinder 5 is not operated, so that the preprocessing section 7 is held in the same position.

■ Detection voltage V8 (If V1<V!, that is,
If the height above the ground is too high, in this case, the first and second comparison circuits Camp
, -Comp, no output voltage is generated. Both the voltages (V+ and Vz) applied to the negative terminal are connected ■6
This is because it is also thick. Therefore, relay 1 (yl・FL
Both y and y are not energized. Since the relay switch 5w2it is a so-called a contact, it remains open when there is no signal, but the relay switch sw1 is a so-called b contact, and the contact remains closed when there is no signal. Therefore, the solenoid SQL of the electromagnetic valve 9 is energized by the power source E to switch the oil path, and the pretreatment section 7 is lowered about the pivot point A by the operation of the hydraulic cylinder 5. As this -F continues to fall, the height above ground detecting device 8 also continues to fall, so the detection voltage v day also increases. This detection voltage ■8 is within a preset range, that is, V, <v-3
<■ When the temperature falls within the range 2, the preprocessing section 7 stops descending due to the reason stated in section 2.

The cutting height of the culm is adjusted in this way. The detection device 8 is located between the lifting start end of the pulling device 2 and the cutting blade 3, and after the lifting start end passes, Since the height above the ground is detected prior to the cutting blade 3, constant cutting height adjustment is possible even when the field is uneven or when grain culms are collapsed and intertwined. The cutting height can be easily set by changing the voltages (1) and (2) to the comparator circuits Cζnom p and Comp.

As is clear from the above description, in the combine cutting height adjusting device according to the present invention, the detection device for detecting the height above the ground is positioned between the lifting start end of the pulling device and the cutting blade in side view. Because of this, unlike the conventional structure mentioned at the beginning, there are no drawbacks such as damage caused by the cutting blade colliding with convex parts of the field, or uneven cutting height, and the cutting height is always stable. Adjustments can be made. In addition, since the detection device is of a non-contact type, stable adjustment can be made without malfunction even in weak fields, and its durability is dramatically increased. Furthermore, a comparison circuit is provided that compares the detection signal from the detection device with a preset setting signal, and a solenoid valve is operated based on the signal from this comparison circuit to adjust the cutting height i. Because it is something to do,
Using this comparison circuit, the cutting height setting operation can be performed simply, easily, and reliably, and the conventional drawbacks mentioned at the beginning can be completely eliminated.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; the GT diagram is an overall side view of the combine, FIG. 2 is a block diagram, and FIG. 3 is an electro-hydraulic circuit diagram that controls the operation of the main parts. ... combine harvester, 2 ... pulling device, 3 ... cutting blade, 6 ... hydraulic system, 7 ... pretreatment section, 8 ... detection device, 9 ... solenoid valve. Voluntary procedure amendment dated December 13, 1980 1 Indication of case 1988 Patent Application No. 214590 2 Title of invention Cutting height adjustment device for combine harvester 3 Person making the amendment Relationship to the case Patent applicant 4 Agent 5, Date of amendment order 6, Number of inventions increased by amendment 7, Claims column of the specification subject to amendment, Detailed explanation of the invention column and Brief explanation of drawings column 8, Amendment Contents (1) The scope of the claims has been revised as shown in the attached sheet. (2) From page 3, line 2 to page 4, line 11 of the specification, the phrase ``always in the condition'' related to 1 will be corrected to the following sentence. Regarding l-, in detail, it has a cutting blade for reaping the bedside part of the culm, and a pulling device whose starting end is positioned forward of the cutting blade, and which is pivotally supported on the main body of the fuselage. This invention relates to a cutting height adjustment device for a combine harvester, which includes a processing section, a cutting height detection sensor, and a hydraulic device that adjusts the cutting height by raising and lowering the pretreatment section in accordance with the operation of a solenoid valve. . The conventional cutting height detection sensor in the above-mentioned cutting height adjustment device includes, for example, a sensing sled body provided at the free end of a swinging arm, and performs preprocessing based on the swinging of the arm as the preprocessing section moves up and down. Because it is a so-called field contact type that detects the ground height of the part and the trench cutting height, it is easy for straw waste to get wrapped around the arm and sled body, and for the pivot part to become clogged with mud. Therefore, there was a great risk of undetectable situations or malfunctions occurring. Furthermore, if the field is soft, the sled body (2) sinks into the mud, making it impossible to accurately detect the height of the pretreatment section above the ground, that is, the cutting height. If the sled body remains submerged in the mud (when several sled bodies are rotated, excessive force may be applied to the sled body and the sled body may be damaged). A set of sets is provided to separately detect whether the cutting height exceeds the upper limit or falls below the lower limit of the appropriate cutting height range,
Therefore, if the cutting height detected by both sensors is within the appropriate cutting height range, the cutting height is not adjusted, creating a so-called control dead zone.
Mechanically constructing a dead zone using a set of sensors not only complicates the device and increases cost, but also has the disadvantage that problems such as the above-mentioned problems such as the entanglement of straw waste become more prominent. The present invention eliminates these conventional drawbacks, has fewer failures, and is highly reliable.'' (3) Page 5, lines 8, 12, 15, 17, and 6
Lines 3, 10, and 15 of the page, lines 8 and 18 of the 7th page, line 07 of the 8th page, line 7 of the 9th page, line 1 of the 11th page, and line 2 of the 13th page. Correct "detection device" to "detection sensor". (4) On page 11, lines 6 to 12, “In this way...
Correct "...to be accomplished" to the following sentence. ``In summary, the height of the cutting blade 3 above the ground, that is, the cutting height, is detected based on the voltage V8 detected by the cutting height detection sensor 8, and one variable resistor R1 is connected to the upper limit setting device of the appropriate cutting height range. , the future divided voltage v1 is set as the upper limit cutting height setting value of the appropriate cutting height range, and the other variable resistor R2
is set as the lower limit setter of the appropriate cutting height range, the divided voltage v2 from this is set as the lower limit cutting height setting value of the appropriate cutting height range, and the upper limit cutting height setting value v1 from the upper limit setting device R1 is set as the lower limit setting value v1 of the upper limit setting device R1. The lower limit cutting height setting value ■2 from the lower limit setter R2 is input to the first comparison circuit Com-p, and the cutting height detection value VS from the cutting height detection sensor 8 is input to the second comparison circuit (com-p). The mowing height detected by the sensor 8 is input to the comparison circuits Comp1 and Comp2 respectively, so that when the mowing height detected by the sensor 8 is within the appropriate mowing height range, the cutting height is not adjusted. When the cutting height exceeds the -F limit cutting height of the appropriate cutting height range, a signal for driving the descending drive circuit is outputted from the first comparison circuit Comp, and the detected cutting height is lower than the -F limit cutting height. When the above-mentioned sensor 8 outputs a signal for driving the rising side drive circuit, the sensor 8 outputs a signal for driving the rising side drive circuit, and the sensor 8 detects that the cutting height is at the proper cutting height and within the cutting range. The pre-processing section 7 is lowered or raised until it falls within the dead zone of the cutting height control that does not allow high adjustment.In addition, the front pressure 1 and v2 are varied at the same value. By this, the upper and lower limits of the appropriate cutting height range can be changed while keeping the upper and lower dead zones (1) constant, and the cutting height can be adjusted to high or low cutting. By changing the upper value of one of heavy pressures ■1 and ■2, you can change the set value of either the upper limit or the lower limit, and of course, you can change the voltage values of both voltages ■1 and v2. The upper and lower limits can be changed by setting the upper and lower limits, that is, the upper and lower widths of the dead zone can be narrowed or widened.'' (5) ``Detection'' from page 11, line 17 to page 12, line 13. be able to...
” is corrected to the next sentence. Since the mowing height detection sensor that detects the mowing height based on R is a non-contact type, there are no cases where detection is impossible or malfunctions due to winding of straw waste or clogging of mud, etc., as in the past.
Furthermore, troubles such as damage to sensors due to turning of the aircraft are completely eliminated. Moreover, even if the field is weak and the aircraft sinks,
The cutting height relative to the first lifting surface can be detected accurately, and the cutting height can be adjusted with extremely high precision. Moreover, the cutting height setting Ii of the - limit and lower limit of the appropriate cutting height range
Compare & with the value detected by the cutting height detection sensor (
7) Since the cutting height detected by the cutting height detection sensor is controlled to be within the appropriate cutting height range, only one cutting height detection sensor is required, which simplifies the device. Aiming for cost reduction and overall simple technical improvement.'' Claims: A cutting blade 3 for reaping the base of a grain culm, and a pulling blade whose starting end is positioned in front of the cutting blade 3. A pre-processing section 7 having a device 2 and pivotally supported on the main body of the machine, a cutting height detection sensor 8, and a solenoid valve 9 are operated to raise and lower the pre-processing section 7 to adjust the cutting height. In the cutting height adjustment device for a combine harvester having a hydraulic device 6 for adjusting the cutting height, the cutting height detection sensor 8
consists of one non-contact ground height detection device, with setting devices R1 and R2 for the upper and lower limits of the appropriate cutting height range, and a first
and a second comparison circuit Comp, Comp2, and a drive circuit for raising and lowering the preprocessing section 7 so as to perform the second movement when the detected cutting height falls below the lower limit cutting height. A cutting height adjusting device for a combine harvester, characterized in that:

Claims (1)

[Claims] A pre-processing section 7 includes a cutting blade 3 for reaping the base of the grain culm and a pulling device 2 whose starting end is positioned forward of the cutting blade 3, and is pivotally supported on the main body of the machine. A mowing height adjustment device for a combine harvester, which has a mowing height detection sensor 8 and a hydraulic device 6 that adjusts the mowing height by raising and lowering the pretreatment section 7 in accordance with the operation of a solenoid valve 9. The cutting height detection sensor 8
consists of one non-contact ground height detection device, with setting devices R1 and R2 for the upper and lower limits of cutting height, and first and second
A comparison circuit (:'omp, Comp2) and a drive circuit for raising and lowering the preprocessing section 7 are provided, and the signal from the detection sensor 8 and the set value of the upper limit setting device R are Input it into the comparison circuit Comp,
When the sensor signal is smaller than the set value, the first comparison circuit Comp outputs a signal that drives the lowering drive circuit, and the signal from the detection sensor 8 and the lower limit setter R
2 is input to the second comparison circuit Camp2, and when the sensor signal is smaller than the set value, a signal for driving the ascending drive circuit is outputted from the second comparison circuit (:omp, . . . The signal from the detection sensor is the upper limit setter R1
is larger than the setting value of and the setting of lower limit setter R2 (lif
When it is smaller than , both comparison circuits Qornp,・C0
Cutting height adjustment device 0 for a combine harvester, characterized in that it is configured so as not to output a signal from any of IIIp2.