JPH0419508A - Inclination detector - 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 A6 Purpose of the Invention 1) Industrial Application Field The present invention relates to a tilt detection device for detecting the tilt of a certain member, elliptical corpse, etc. when it tilts from a horizontal state by a certain angle or more. .

Such an inclination detection device can be used, for example, when an aerial work vehicle is
It is used to issue a warning when the construction vehicle is tilted more than 13.5 degrees or when the construction vehicle is tilted more than 13.5 degrees.

2) Prior Art As a conventional tilt detection device of this type, those shown in FIGS. 7A to 9B are known.

The tilt detection device shown in FIGS. 7A and 7B is a mercury switch in which mercury 02 and terminals 03 and 04 are enclosed in a sealed container 01. This mercury switch is off in the horizontal state shown in FIG. 7A, but in the left-down tilted state shown in FIG. 7B, the mercury switch connects the terminals 03 and 04 and turns on. Therefore, if it is tilted downward to the left by a predetermined angle or more, it can be detected.

The tilt detection device shown in FIGS. 8A and 8B is composed of a reed switch 05, a magnetic fluid 07 sealed in a container 06, and a magnet 08 floating in the magnetic fluid 07.

The member supporting this inclination detection device is in a horizontal state (No. 8A
In the tilted state (see Figure 8B), the reed switch 05 is on because the magnet 08 is close to it; however, in the tilted state (see Figure 8B), the reed switch 05 is off because the magnet 08 is far away. be.

The inclination detection device shown in FIGS. 9A and 9B has a pendulum 010 swingably supported around a rotation axis 09 with a slit 011 of a predetermined shape formed therein, and a light emitting element 012 and a light receiving element placed on both sides of the slit 011. 013 are arranged facing each other. This 9th A.

In the tilt detection device shown in FIG. 9B, when the pendulum 010 rotates around the rotation axis 09 by more than a predetermined angle, the light receiving element 013 stops receiving light from the light emitting element 012.

3) The problem to be solved by the invention is the inclination detection device shown in FIGS. 7A, 7B, 8A, and 8B! Since this method utilizes the flow of a fluid, there is a problem in that when the viscosity of the fluid increases at low temperatures, the fluidity decreases and the sensitivity decreases. Moreover, the seventh A
The inclination detection device shown in FIG. 7B also has a problem in that it can only detect inclination in one direction. Also, the 9th
The inclination detection device shown in Figures A and 9B can detect the inclination angle around the rotational axis that supports the pendulum, but has a problem in that it cannot detect the inclination around the axis perpendicular to the rotational axis.

In view of the above-mentioned circumstances, it is an object of the present invention to enable accurate detection of inclination angles in arbitrary directions.

B1 Configuration of the Invention 1) Means for Solving the Problems In order to solve the above problems, the inclination detection device of the present invention includes:
A shielding plate is provided at the lower end of the vertical member, which is rotatably supported around a fulcrum provided on the fixed member and maintained in a vertical position by gravity, and the fixed member blocks the light emitting element and the light emitted from the light emitting element. A plurality of optical sensors each comprising a light-receiving element that receives light is supported, and when the shielding plate rotates about the fulcrum together with the vertical member, the optical path of the optical sensor is traversed by the shielding plate. It is characterized by being placed in a position where

The above-mentioned "position where the optical path of the optical sensor is crossed by the shielding plate when the shielding plate rotates around the fulcrum together with the vertical member" is the position where the shielding plate is rotated. , the position where the optical path of the optical sensor changes from the conductive state to the blocked state (i.e., the position where it is initially in the conductive state) and the position where it changes from the blocked state to the conductive state (i.e., the position where it is initially in the blocked state). position).

2) Operation The inclination detection device of the present invention having the above-mentioned configuration is used by fixing the fixing member to the body of a construction vehicle or the like. When the fixed member tilts together with the vehicle body, the vertical member is held in a vertical position by gravity, but at that time, the vertical member and the shielding plate rotate relative to the fixed member.

The shielding plate moves to cross the optical path of the optical sensor, and when the amount of relative rotation thereof exceeds a predetermined value, the optical path between the light emitting element and the light receiving element of the optical sensor becomes
The light is no longer blocked by the shielding plate, and the previously blocked optical path becomes conductive. The inclination of the vehicle body or the like is detected by the change in the blocking/conducting of the optical path by the shielding plate.

3) Embodiments Hereinafter, embodiments of the inclination detection device of the present invention will be described with reference to the drawings.

1A and 18 are configuration explanatory diagrams of a first embodiment of the present invention.

1A and 18, the fixing member 1 has an upper conical side wall 2 and a lower spherical bottom wall 3. A ring-shaped intermediate wall 4 is provided inside the conical side wall 2. There is. Eight light emitting elements 5 are provided on this ring-shaped intermediate wall 4 along the circumferential direction. Eight light receiving elements 6 are disposed on the spherical bottom wall 3 to face the eight light emitting elements 5. A pair of light emitting elements 5 arranged opposite to each other
and the light receiving element 6 constitute one optical sensor.

A ball joint 7 is provided at the top of the conical side wall 2. In this ball joint 7, the upper end of the rod-shaped vertical member 8 is connected to the ball joint 7.
It is rotatably supported around the center point (fulcrum). A spherical shielding plate 9 is connected to the lower end of this vertical member 8 .

When the fixing member 1 is used by being attached to the body of a construction vehicle, etc., the fixing member 1 and the shielding plate 9 etc. are held in the state shown in FIG. 1A when the vehicle body is in a horizontal position. , attach. In that case, as can be seen from FIGS. 1A and 18, all of the optical paths of the eight light emitting elements 5 and the light receiving elements 6 are not blocked (all are in a conductive state).
However, when the fixing member 1 is tilted together with the vehicle body, the optical path is blocked by the shielding member 9, as shown in FIGS. 2A and 2B.

FIG. 3 shows a first embodiment of the tilt detection circuit of the tilt detection device.

In FIG. 3, if all the optical paths between the eight sets of light emitting elements 5 and light receiving elements 6 are not blocked, the transistor T
RI is on (ON), and transistor TR2 is also on.

However, if the optical path of one of the eight light emitting elements 5 and light receiving elements 6 is interrupted, the potential at point 0 rises due to the pull-up resistor R, and the potential of the transistor TR increases.
I and TR2 are turned OFF, and at this time, the emergency stop circuit 10 is activated.

Next, the operation of the first embodiment of the present invention shown in FIGS. 1A, IB, 2A, 2B, and 3 will be explained.

When the fixing member 1 is used by being attached to the body of a construction vehicle, etc., when the vehicle body is in a horizontal position, the fixing member 1
The shielding plate 9 and the like are maintained in the state shown in FIG. 1A. Then, all eight light emitting elements 5 are used in an on state. In this case, as can be seen from FIG. 3, the transistors TR1 and TR2 are kept on.

By the way, when the fixing member 1 is tilted by a predetermined angle or more together with the vehicle body, the optical path between any of the light emitting elements 5 and the light receiving elements 6 is blocked by the shielding plate 9, as shown in FIGS. 2A and 2B. At this time, the transistor T
RI and TR2 are turned off, and the emergency stop circuit 10 is activated. For example, when this emergency stop circuit 10 is activated,
By stopping the engine, the vehicle body and the like are prevented from rolling over.

FIG. 4 shows a second embodiment of the tilt detection circuit.

In FIG. 4, during the operation of this tilt detection circuit, all eight light emitting elements 5 are used in an on state. Therefore, the fixed member 1, the vertical member 8, etc.
In the state shown in the figure, all of the light receiving elements 6 are on. In this case, the outputs of each light receiving element are all at a low level. At this time, the output of the OR circuit 11 is "0", and the transistor TR3 is kept off.

However, when the optical path between any of the light emitting elements 5 and the light receiving elements 6 is blocked by the shielding plate 9, the output of the light receiving element 6 whose optical path is blocked becomes a high level H due to the pull-up resistor R. At this time, the output of the OR circuit 11 becomes "1", the transistor TR3 is turned on, and the alarm circuit 12 is activated. When this alarm circuit 12 is activated, for example, if an operation is performed to stop the vehicle body, etc.,
Overturning of the vehicle body etc. is prevented.

Next, the structure of a second embodiment of the inclination detection device of the present invention will be explained with reference to FIGS. 5A to 5C, 6A, and 6B.

In this second embodiment, Figures 5A and 5B correspond to Figures 1A and 18 of the first embodiment, and Figures 6A and 6
Figure B is 2A of the first embodiment.

FIG. 2B is a diagram corresponding to FIG. 2B. In addition, in this second embodiment, components corresponding to those of the first embodiment shown in FIGS. Omitted.

The shielding plate 9 of this second embodiment is made of a conductor.

Further, a magnet 13 and a yoke 1 are provided on the outside of the spherical bottom wall 3.
4 is arranged, and a magnetic field is applied to the shielding plate 9. When the shield plate 9 moves in this magnetic field, an eddy current is generated in the conductive shield plate 9. The faster the shielding plate 9 moves, the greater the brake is applied, which slows down the response (inclination detection speed) and produces a damper effect.

The tilt detection device of the second embodiment can be used in cases where slow response is required, for example, in cases where there is a risk of malfunction due to small vibrations or short jumps, such as in vehicles traveling on rough terrain. I can do it.

Although the embodiments of the present invention have been described above in detail, the present invention is not limited to the embodiments described above, and various small design changes may be made without departing from the scope of the invention described in the claims. It is possible to do so.

For example, in the tilt detection device of the present invention, by arranging the light emitting element and the light receiving element along an ellipse, the tilt angle to be detected can be varied depending on the detection direction. Further, by making the shape of the shield plate elliptical, the detected inclination angle can be adjusted according to the detection direction.

Moreover, the shielding plate can also be made into a flat plate instead of having a spherical shape. Furthermore, when the vehicle body, etc. whose attitude is to be detected is in a horizontal state, the light emitting element and the light receiving element are maintained in a conductive state, and when the vehicle body or the like is tilted by a predetermined angle or more, the state is cut off. Furthermore, it is also possible to maintain the connection between the light-emitting element and the light-receiving element in a cut-off state, and to turn on when the light-emitting element and the light-receiving element are tilted at a predetermined angle or more.

C9 Effects of the Invention In the above-mentioned inclination detection device of the present invention, a shielding plate is provided at the lower end of a vertical member that is rotatably supported around a fulcrum provided on a fixed member and maintained in a vertical posture by gravity, and A plurality of optical sensors each consisting of a light-emitting element and a light-receiving element that receives light emitted from the light-emitting element are supported by the fixing member, and the shielding plate of each optical sensor rotates around the fulcrum together with the vertical member. Since the optical sensor is placed in a position where the optical path of the optical sensor is crossed by the shielding plate when the sensor is moved, by appropriately setting the optical sensor position,
The tilt angle in any direction can be detected with high precision.

[Brief explanation of drawings]

Figures 1A and IB are structural explanatory diagrams of the first embodiment of the inclination detection device of the present invention, showing the state when the object to be detected is in a horizontal position, and Figures 2A and 2B are the first embodiment of the same. FIG. 3 is a diagram showing the first embodiment of the inclination detection circuit used in the first embodiment, and FIG. 4 is a diagram showing the second embodiment of the inclination detection circuit used in the first embodiment. 5A to 50 are structural explanatory diagrams of the second embodiment, FIG. 6 is an operational explanatory diagram of the second embodiment, and FIGS. 7A to 9B are explanatory diagrams of a conventional example. 1... Fixed member, 5... Light emitting element, 6... Light receiving element, 8... Vertical member, 9... Shielding plate, Patent applicant Shimadzu Corporation Representative Patent attorney 1) Takashi Naka Figure 1A Figure 1B Figure 2A Figure 2B Figure 5C Figure 5A Figure 5B Figure 3 Figure 4 Figure 6A Figure 6B Figure 9A Figure 9B Figure 7B Figure I Section 8B

Claims (1)

[Claims] A shielding plate is provided at the lower end of the vertical member, which is rotatably supported around a fulcrum provided on the fixed member and maintained in a vertical position by gravity, and the fixed member blocks the light emitting element and the light emitted from the light emitting element. A plurality of optical sensors each comprising a light-receiving element that receives light is supported, and when the shielding plate rotates about the fulcrum together with the vertical member, the optical path of the optical sensor is traversed by the shielding plate. Tilt detection device located at a position where