JPS58202815A - Slant detecting device - Google Patents

Abstract

PURPOSE:To enhance the detecting accuracy of a slant, by optically detecting the change in position of a bubble, which is formed between a hollow body and liquid filled therein, by utilizing a low light transmitting rate of a bubble. CONSTITUTION:A bubble 2, which is formed between a transparent liquid that is filled in a transparent hollow body 1 and said hollow body 1, is moved to positions 2a and 2b by the slant of a substrate 3. When the bubble 2 is located at a position in a light path between a light emitting device 4 and a light receiving device 5, the amount of received light is decreased by the diffused reflection of light in the bubble 2. Therefore, the presence or absence of the slant of the substrate 3 can be accurately detected by the change in output signal of the light receiving device 5. The detecting device is suitable as a slant sensor for a rotary of an agricultural machine.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tilt detection device that uses optical means to detect a change in the position of a bubble formed between a hollow body and a liquid filled therein. The main feature is that a hollow body is filled with a transparent liquid, and changes in the position of the bubbles are detected by utilizing the fact that the bubbles have a lower light transmittance than the transparent liquid.

2. Description of the Related Art Devices configured to detect the inclination of an object to be detected by detecting changes in the position of air bubbles are widely known.

For example, M
There is a detection device filled with a colored liquid and in which a light emitter and a light receiver are disposed facing each other with a hollow body interposed therebetween.

This detection device utilizes the characteristic of light passing through bubbles, and is configured to detect an inclination when a bubble is located in the light emitting path.

However, the above-mentioned detection device is not necessarily suitable, since diffuse reflection of light occurs within the bubbles, and the degree of reduction in passing light is large. That is, the sensitivity of the photodetector is required to correspond to the degree of light reduction, and the circuit configuration for processing the photoelectric conversion signal of the photodetector tends to be complicated.

Therefore, in the present invention, the above-mentioned problem is solved by effectively utilizing the light reduction characteristic within the bubble.

Furthermore, the present invention proposes a detection device suitable as a tilt sensor for a rotary for agricultural machinery, and detects the horizontal tilt of the rotary using the state in which the rotary is raised at a predetermined angle during soaking work as a detection reference point. The purpose is to improve tilt detection accuracy.

In the present invention, however, there is provided a hollow body that transmits light, a transparent liquid filled with air bubbles, and an optical system that detects a change in the position of the air bubbles by allowing light to pass through a portion of the hollow body. The inclination of the object to be detected is detected by utilizing the fact that the bubble portion has a lower light transmittance than that of a transparent liquid.

Further, a second invention of the present invention provides a hollow body made of a material that transmits light and slightly curved along the longitudinal direction, a transparent liquid filled in the hollow body with air bubbles, and An inclination detection device is composed of an optical detector that detects changes in the position of the bubbles by passing light through two parts of the body, and this inclination detection device is used to detect the left and right inclinations of the rotary for the pickled vegetables machine. As an inclination sensor for detecting the inclination, the hollow body is installed so that when the rotary rises at a predetermined angle during agricultural work, the curved twill portion of the hollow body is oriented substantially upward. .

Hereinafter, the actual relaxation of the present invention will be explained along with the drawings.

FIG. 1 schematically shows an inclination detection device according to the present invention.
is a hollow body made of a transparent material such as glass or synthetic resin, which is filled with a transparent liquid such as alcohol, silicone oil, or ether. Reference numeral 2 denotes a bubble provided between the hollow body 1 and the transparent liquid, and the bubble 2 moves as shown by two-dot chain lines 2α and 2h according to the inclination of the device base 3. 4 is a light emitter such as an LED, and 5 is a light receiver consisting of a phototransistor or the like. The light emitter 4 and the light receiver 5 are arranged opposite to each other with the hollow body 1 in between, as shown in the figure.

In the above-described detection device, when the bubble 2 is located in the light emitting path of the light emitter 4, the amount of light received by the light receiver 5 is extremely reduced. That is, when the bubble is moving like 2α or 2h, the light passes through the hollow body 1 and the transparent liquid;
The light collected by the lens action of the transparent liquid is received by the light receiver 5. When the bubble 2 is located in the light emitting path of the light emitter 4 as shown in the figure, the amount of light reaching the light receiver 5 decreases due to diffuse reflection of light within the bubble.

Therefore, it is possible to determine whether or not the device base 3 is tilted based on a change in the output signal of the light receiver 5.

However, in the above detection device, the arrangement of the light emitter 4 and the light receiver 5 is important. In this embodiment, their arrangement was determined based on the experimental results shown in FIGS. 2 to 4.

FIG. 2 is an enlarged longitudinal sectional view of the hollow body 1, FIG. 3 is a detection control circuit, and FIG. 4 is a graph showing experimental results.

In this experiment, a hollow body 1 with a diameter S1 of 7 mm was used, and the depth S2 of the bubble 2 was set to 4 mm. used.

In addition, in this experiment, the light emitter 4 and the light receiver 5 were set at each height of H1 to H4 shown in FIG. 2, and the voltage at the output point P of the light receiver 5 shown in FIG. Measured as ■.

In the experiment conducted in this way, the emitter 4 and the receiver 5
When H is set to Hi = 3.5 mm, it turns out that the curve shown in Fig. 4 is obtained, and the emitter 4 and receiver 5 are set to H2 =
When set to 4 mm, it was confirmed that 8 curves as shown in FIG. 4 were obtained. A colleague installed the emitter 4 and receiver 5 at H3=4.5m.
m, H4 = 5mm, C curve, D curve.
It turned out to be a ticket.

From this, it is preferable that the light emitter 4 and the light receiver 5 be set at the H2 position.

Next, FIGS. 5 and 6 show an embodiment in which the inclination detection device of the present invention is implemented as an inclination sensor for a rotary for agricultural machinery.

FIG. 5 shows an agricultural machine, in which 6 is a tractor, 7 is a rotary as a working machine, and 8 is an inclination sensor attached to the rotary 7.

The above-described tilt sensor 8 detects the horizontal tilt of the rotary 7 and generates a detection signal to correct this tilt.
Many devices generate a detection signal when the temperature exceeds .

In addition, the rotary 7 is normally in a horizontal position as shown in the figure, but when it is used for agricultural work, the rotary 7 moves upward at a angle of d7 of p = 2 cf to 30 degrees, using the shaft of the tractor 6 as a fulcrum.
rises with For this reason, it is preferable that the inclination sensor 8 is configured to operate properly when the rotary 7 is raised during the operation.

FIG. 6 is a plan view of the inclination sensor 8, and FIG. 7 is a sectional view taken along the line x-xm of FIG. 6↓. In these drawings, 9 is a sensor cover, 10 is a sensor board, 11 is a detection device, 12 is a mounting base that gives the detection device 11 an installation angle of approximately 5 degrees, and 13 is a drive device that corrects the inclination of the rotary 7. This is the concatenated code.

Moreover, the detection device 11 has approximately 2
It is installed so that it has an upward slope of 5 degrees, and the detection device 1 is installed when the rotary 7 is tilted upward by approximately 25 degrees.
1 is horizontal.

The detection device 11 has the structure shown in FIG. 8, and the hollow body 14 has almost the same structure as the one shown in FIG. This causes bubbles 15 to be formed. However, this hollow body 14 is slightly curved in the longitudinal direction as detailed in FIG. 9 and FIG. be.

Further, it is preferable that the hollow body 14 has a flattened shape with a somewhat rounded shape.

In the detection device 11, a light emitter 1 is attached to one end of the hollow body 14.
7 and a light receiver 18, and a light emitter 19 and a light receiving fat at the other end, and when the bubble 15 moves to the side of the hollow body 14, it is detected by these optical means.

The tilt sensor 8 having the above structure is attached to a suitable horizontal surface of the rotary 7 in the state shown in FIG. When installing, make sure that the left side in Fig. 7 is on the tractor side.

The creation of the tilt sensor 8 mounted in this manner, especially the operation of the detection device ff1l, takes the 111th Mi (α), (b), (cl) states with respect to the vertical movement of the rotary 7.

Fig. 11 (α) shows the operating state when the rotary 7 is in its normal state, that is, horizontally as shown in Fig. FIG. 11(e) shows the expansion of the operation when the rotary 7 moves upward by 45 degrees.

(b) As can be understood from the above, when the tilt of the rotary 7 reaches 25 degrees, the detection device 11 becomes almost horizontal while the rotary 7 is engaged in agricultural work. When the rotary 7 is tilted to the left or right in this state, the bubbles 15 move within the curved chair portion of the hollow body 14. When the bubble 15 moves within the curved section, the greatest resistance is applied to this movement, and if the rotary 7 is tilted to the left or right, for example, within 1 degree, the bubble 15 moves to the light emitting path of the light emitter. Without this, tilt detection will not be performed. In this embodiment, the rotary 7 is
The configuration is such that the bubble 15 moves sufficiently to detect the inclination when the inclination in the left-right direction exceeds 1.7°.

Furthermore, when the rotary 7 is horizontal as shown in FIG. 11 (α), and when the rotary 7 is in a raised state as shown in FIG. The body 14 moves from side to side with respect to the curved body 5. In such a state, the resistance to the movement of the bubble 15 decreases compared to the case of b+ in Figure 11. Figure (α: and the 11th evil (C
In state I, almost the same direction detection condition is set, that is, the rotary tilt angle is approximately the same.

The twelfth graph is a graph showing the detection operating point of the inclination sensor 8. When the rotary 7 is horizontal, it is detected when the horizontal inclination of the rotary 7 is about 1°55°. In a case where the rotary 〒7 is tilted upward by 25 degrees, the inclination of the rotary 7 in the left and right direction is approximately 1.74.
If the rotary 7 is tilted upward by 45 degrees, it is detected when the horizontal tilt of the rotary 7 reaches approximately 1.58 degrees.

As can be seen from this graph, the tilt sensor 8 of this embodiment
According to , even if the rotary 7 moves vertically at an angle of 0° to 45°, the horizontal inclination of the rotary 7 is FJl, within an extremely narrow change of 55° to 1.75°. It can be extracted.

The 13th line shows the tilt control circuit that uses the tilt sensor 8, and the diodes 21, 22 and capacitors 24 and 24 are connected to the current circuit, and 5, Z
Reference numeral b indicates a comparator forming a comparator, reference numbers 27 to 27 indicate folding resistors that generate a reference voltage, and reference numerals 31 and 32 indicate switching transistors that are turned on in response to the comparator output.

In this control circuit, each comparator 5.26 is in a non-detecting state when the bubble 15 is at the position shown, and when the bubble 15 moves to the light emitting path of either the light emitter 17 or 19. The comparator 25 or 26 operates to turn on the transistor 31 or 32.

As mentioned above, in the present invention, the hollow body is filled with a transparent liquid and the bubbles form a light-blocking medium, so that the drawbacks of the optical detector for detecting changes in the position of bubbles can be easily solved. This is advantageous in that it is possible to improve the accuracy of detecting the tilting debris and to simplify the additional detection signal processing circuit.

In addition, when using the tilt detection device of the present invention as a tilt sensor for a rotary for corrosive damage storage, (1) Set an installation angle on the detection device in advance, and adjust the tilt based on this installation angle. Since the detection operating point has been determined, the rotary is 00~
Even if the rotary is moved up and down over a wide range of 45 degrees, the horizontal tilt of the rotary can be detected within a narrow range, which improves the accuracy of the tilt sensor.
The sensor control circuit is simple and effective.

Incidentally, the inclination detection device of the present invention can be easily implemented as a inclination detection device for not only agricultural machinery Kawaguchi-Tally 1 or J sensor but also other agricultural machinery, construction machinery such as bulldozers and cranes, ships, etc. can do.

In addition, in the above embodiment, the mounting base 12 has an inclination of 25°.
is provided to give the detection device 11 a different mounting angle, but this detection device 11 must be mounted directly on the sensor board lO.
The sensor board 10 may be tilted with the mounting base 12 and a member attached thereto, and the mounting angle of the detection device 11 can be set as appropriate, such as 22.5° or 300°.

Furthermore, as a tilt sensor in which the detection device 11 has a mounting angle, it is also effective to use a conventional detection device in which a colored liquid is contained in a hollow body.

In addition, as an unconventional embodiment, the assembly device 11 is directly fixed to the sensor substrate 10, and the hollow body 14 is mounted so that the curved twill portion forms a predetermined angle with respect to the device base 16. You can also attach it.

[Brief explanation of the drawing]

FIG. 1 is a simplified diagram showing an embodiment of the inclination detection device according to the present invention, FIG. 15i1 wholesale circuit diagram, Figure 4 is a diagram showing the detection signal of the above detection device obtained by experiment, Figure 5
The figure is a side view of a tractor showing an example of using the inclination detection device according to the present invention as an inclination sensor, FIG. 6 is a plan view of the inclination sensor, and FIG. 7 is a sectional view taken along line X-X in FIG. 6. Figure 8 is a partially cut-out enlarged view of the detection device provided in the above-mentioned inclination sensor, Figure 9 is a sectional view of the hollow body provided in the detection device, and Figure 10 is the hollow body shown in Figure 9. Enlarged tm diagram of the hollow body cut along the Y X-ray, Figure 11 (α),
(b) and (e) are diagrams showing the operating state of the above-mentioned detection device provided in the tilt sensor, FIG. 12 is a graph showing the detection operating point of the tilt sensor, and FIG. 13 is a tilt control circuit diagram. 1...Hollow body 2...Bubble 3...Device base 4...Light emitter 5...Light receiver 7...Rotary 8...Tilt sensor 11...Detection device 1
2... Mounting base that gives the mounting angle to the detection device 14... Hollow body 15... Air bubble 1'7.19
...Emitter 18.20 ...Receiver clock Applicant Yugosayaki Kogyo Co., Ltd. Agent Hiroharu Koike, )jll Figure 1 Figure 2 Figure 3 Figure 4 Ki 4 Hitoshi Nagisa Fig. 5 Fig. 9 Fig. 8 Fig. 12 0910° 2♂ 3♂ 4♂ 5♂ 6♂ Rotary vertical blade direction

Claims (3)

[Claims] (1) A hollow body that transmits light, a transparent liquid filled with air bubbles, and optical detection that detects changes in the position of the air bubbles by allowing light to pass through a portion of the hollow body. An inclination detection device that detects the inclination of an object to be detected by utilizing the fact that the bubble portion has a lower light transmittance than the transmitted liquid. (2) Detecting changes in the position of the air bubbles by allowing light to pass through a hollow body that transmits light, a transparent liquid filled with air bubbles in the hollow body, and two parts of the hollow body. and an optical detector, which detects the inclination of the object to be detected by utilizing the fact that the bubble portion has a lower light transmittance than that of a transparent liquid. Device. (3) A hollow body made of a light-transmitting material and slightly curved in the longitudinal direction to form a core, a transparent liquid filled in the hollow body with air bubbles, and two parts of the hollow body. and an optical detector that detects a change in the position of the bubble by allowing light to pass through the portion thereof, and an optical detector that detects a change in the position of the bubble, and the tilt detection device is used as a tilt sensor that detects the left and right tilt of a rotary for agricultural machinery, and . An inclination detection device installed so that when the rotary is raised at a predetermined angle during agricultural work, the curved twill portion of the hollow body is almost at an upper angle.