JP2002148081A - Bending force sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that there is no sensor capable of simply and accurately sensing a bending force represented by a land slide or the like. SOLUTION: A sensing bar 3 has an electrically insulating casing 9, center leads 29 disposed in a state in which the leads 29 are pulled by a coiled spring 27 from both end sides, and a conductive coil 31 disposed separately from the leads 29 in the casing 9 and surrounding the leads 29. A DC voltage is applied to the bar 3. When the land slide occurs so that the casing 9 is bent, the leads 29 are contacted with the coil 31 to generate a contact to become a DC conducting state. This is sensed by a sensing means such as a photocoupler or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending force sensor, and more particularly, to a bending force sensor capable of easily and accurately detecting the generation of a bending force represented by the occurrence of a landslide.

[0002]

2. Description of the Related Art In a conventional landslide detection sensor, a plurality of piles are driven into the ground at a predetermined distance from each other, the tips of the piles protruding from the ground surface are connected to each other by wires, and the wires are pulled. In this state, the sensor body is disposed at the tip of the wire. In this sensor, when a landslide occurs, tension is applied to the wire, and the occurrence of the landslide is detected using the fact that the tension of the wire changes.

[0003]

A sensor of the above-mentioned type can detect only a landslide on the ground surface because it utilizes a change in the tension of the wire. However, landslides caused by rainwater seepage into the ground often occur underground. Further, since the wire is on the ground, the degree of pulling of the wire may change due to causes other than the landslide. Therefore, an object of the present invention is to solve the above-described problems and to provide a bending force sensor that can easily and accurately detect the generation of a bending force represented by the occurrence of a landslide or the like.

[0004]

In order to solve the above-mentioned problems, a first aspect of the present invention provides an electric insulating and flexible casing, a first conductor disposed in the casing, A second conductor disposed in the casing;
A power supply that applies a DC voltage between the first conductor and the second conductor; and a DC conduction detection unit that detects DC conduction between the first conductor and the second conductor. When the casing is bent, a contact is formed between the first conductor and the second conductor, and a direct current is applied through the contact to provide a bending force sensor.

According to a second aspect of the present invention, there is provided the bending force sensor according to the first aspect, wherein the first conductor is a linear conductor provided in the casing, and the second conductor is disposed in the casing. Wherein the linear conductor is disposed at a predetermined distance from the second conductor.

According to a third aspect of the present invention, there is provided the bending force sensor according to the first or second aspect, wherein the first conductor is a center conductor coaxially arranged with a central axis in the casing, and the second conductor is a second conductor. The bending force sensor is characterized in that the body is a conductive coil disposed in contact with the inner peripheral surface of the casing.

According to a fourth aspect of the present invention, there is provided the bending force sensor according to any one of the first to third aspects, wherein the first conductor and the second conductor are connected via a capacitor. A bending force sensor comprising a power supply for applying an AC voltage between one conductor and the second conductor.

According to a fifth aspect of the present invention, there is provided the bending force sensor according to any one of the first to fourth aspects, wherein the first conductor has a plurality of center conductors electrically insulated from each other at the center of the casing. It is a bending force sensor characterized by being arranged on a shaft.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A landslide detecting bending force sensor 1 according to a first embodiment of the present invention will be described below with reference to FIGS. The bending force sensor 1 includes a detection rod 3, a terminator 5, a sensor body 7, and the like.

The configuration of the detection rod 3 will be described. Code 9
Shows an elongated cylindrical transparent casing, and this casing 9 is made of an electrically insulating material, vinyl chloride (plastic). The casing 9 has flexibility. Caps 11 made of an electrically insulating material are respectively attached to both ends of the casing 9, and the openings at both ends of the casing 9 are closed by the pair of caps 11. A center hole 13 is formed at the center of the bottom plate of the cap 11, and an end hole 15 is formed at an eccentric position of the bottom plate.

A male screw shaft 17 penetrates through a center hole 13 of the cap 11, and the male screw shaft 17 projects inside and outside the casing 9. Male screw shaft 1
7 are provided with nuts 19, 21 and 23
Is installed. Reference numeral 25 denotes a terminal, and the terminal 25 has a base portion passed through the male screw shaft 17 and is fixed between the nut 19 and the nut 21.
One end of a coil spring 27 is connected to a portion protruding into the male screw shaft 17. A center conductor 29 is connected to the other end of the coil spring 27, and the center conductor 29 is arranged on the center axis in the casing 9 while being pulled by the coil spring 27 from both ends.

Reference numeral 31 denotes a conductive coil. The conductive coil 31 is housed in the casing 9 and is provided in contact with the inner peripheral surface of the casing 9. That is, the conductive coil 31
Are arranged in the casing 9 so as to be spaced from and surround the center conductor 29. The terminal 25 fixed to the pair of male screw shafts 17 has a lead wire 3
3 is connected to one end, and one end of a lead wire 35 is also connected to both ends of the conductive coil 31. Lead wire 3
Terminals 37 and 39 are attached to the other ends of the terminals 3 and 35, respectively. The terminals 37 and 39 are attached to a connection case 41. These terminals 37 and 39 and the connection case 4
1 forms a connector 43.

In this bending force sensor 1, the conductive coil 31
As the distance (X-Y) between the sensor and the center conductor 29 becomes smaller, the sensor sensitivity becomes higher. Therefore, as the diameter of the conductive coil 31 decreases, the sensor sensitivity increases. The reason is that the occurrence of a landslide is detected in the bending force sensor 1 by utilizing the contact between the center conductor 29 and the conductive coil 31 as will be described later in detail.

The terminator 5 has a capacitor 45, which is connected to the connector 43 of the detection rod 3.

An electrical configuration centering on the sensor body 7 will be described. The sensor connection portion 49 of the sensor body 7 and the connector 43 of the detection rod 3 are connected by a joint 50.
The DC voltage is supplied to the CPU 55 via the power input unit 51 and the stabilized power circuit 53. Further, the DC voltage is supplied to the constant current power supply circuit 59 via the power supply input unit 51, the stabilized power supply circuit 53, and the voltage variable circuit 57. Based on this, a constant current is output from the constant current power supply circuit 59. The DC current output from the constant current power supply circuit 59 is provided to the detection rod 3 via the sensor connection unit 49. A sensor current detection circuit (photocoupler) 61 as a DC conduction detection means is connected between the constant current power supply circuit 59 and the sensor connection unit 49.
The DC detection signal detected by the sensor current detection circuit (photocoupler) 61 is sent to the CPU 55.

The CPU 55 outputs an AC signal.
This AC signal is amplified by the signal amplifying circuit 63 and sent to the detection rod 3 via the sensor connection 49. The AC signal returned from the detection rod 3 is applied to the inductance load circuit 6.
5 and the like, and detected by a PLLF / D circuit 67 as an AC conduction detecting means.
Sent to 5. Rewritable EEPR as memory
An OM 69 is provided, and the EEPROM 69 has a CP.
A program that defines the operation of U55 is stored.

A joint box 71 described later is connected to the sensor main body 7, and the joint box 71 is provided with an operation setting section (dip switch) 73, and according to the installation environment, detection information is provided. The operation mode is selected depending on whether the provision is only necessary in the vicinity of the installation location or whether it is necessary to transmit the information to a fire department, a government office, a disaster prevention center, or the like. In the first embodiment, the latter operation mode is set.

The system has three serial interfaces 75 for extracting a detection signal, and an appropriate interface is selected according to the installation location and environment. In addition, it has a 20 mA current loop interface 77 for one channel, and can be directly operated from a remote place by connecting to a personal computer.

The usage of the bending force sensor 1 will be described. After the detection rod 3 and the terminator 5 are connected, the bottom cap 75 is fitted to the end of the terminator 5 and fixed. An adhesive is applied to the inside of the bottom cap 75 in advance. Sensor connection portion 49 of sensor body 7 and detection rod 3
Are connected via a joint joint 50 and fixed with an adhesive. The rod 78 in which the bottom cap 75, the terminator 5, the detection rod 3, the joint 50, and the sensor body 7 are integrated is embedded in the underground 80 as shown in FIG.

The sensor body 7 includes a joint box 71
Is connected to the alarm line 79. The alarm line 79 is connected to a power supply / communication line 85 via a collective device (lead battery) 83 fixed to the steel column 81. Assembly device (lead battery) 8
An emergency bell or the like (not shown) is attached to 3. Although the alarm line 79 is buried in the ground in FIG. 5, the alarm line 79 may be extended in the air as shown in FIG.

The detection operation of the bending force sensor 1 will be described. When the bending force sensor 1 is installed in the electrical configuration of FIG.
In the normal state, the center conductor 29 and the conductive coil 31 are connected via the capacitor 45 of the terminator 5, so that an AC circuit is formed. On the other hand, center conductor 2
Since there is no contact between the coil 9 and the conductive coil 31 without passing through the terminator 5, a DC circuit is not formed. Therefore,
When the DC voltage and the AC voltage are applied, P
Only the AC detection signal detected by the LLF / O circuit 67 is sent.

As shown in FIG. 7, when a landslide occurs, a bending force is applied to the casing 9 as shown by an arrow, the casing 9 bends, and the center conductor 29 in the casing 9 and the conductive coil 31 come into contact with each other, and a contact is generated. . When a contact is made, a DC current flows between the center conductor 29 and the conductive coil 31, and a DC circuit is formed. As a result, a DC current flows, and DC conduction is detected by a sensor current detection circuit (photocoupler) 71, and a DC detection signal is sent to the CPU 55. Therefore, the occurrence of the landslide is detected by the bending force sensor 1. Further, when the degree of the landslide increases, the detection rod 3 and the terminator 5 are destroyed, the AC circuit is cut off, and no AC detection signal is sent to the CPU 55. Therefore, the occurrence of a large landslide is detected by the bending force sensor 1.

FIG. 8 shows a rod 87 of a bending force sensor according to the second embodiment. This rod body 87 is different from the first embodiment in that two detection rods 3 are connected via a joint joint 77. Other configurations are the same as those of the first embodiment, and the same reference numerals are given and the description is omitted. By burying a plurality of detection rods 3 connected in the ground in this way, the detection rods 3 can be buried deep underground 80 to a desired depth. Therefore, even when a landslide occurs deep underground, it can be detected. Further, since the resistance value of the DC circuit changes depending on the location of the contact, the location (depth) of the occurrence of the landslide can be detected.

FIG. 9 shows a detection rod 89 of the bending force sensor according to the third embodiment. This detection rod 89 is connected to a conducting wire 91.
Are arranged on the central axis and fixed by fixing means (not shown). The conducting wire 91 has a triple structure, and a central conducting wire 95 is arranged at the center. The outer periphery of the center conductor 95 is covered with an electrically insulating vinyl coating 93. The outer periphery of the vinyl coating 93 is covered with a cylindrical center conductor 97. Therefore, the center conductor 95 and the cylindrical center conductor 97 are electrically insulated.
One ends of lead wires 98 are respectively connected to both ends of the cylindrical center conductor 97. One end of a lead wire (not shown) is connected to both ends of the center conductor 95. Furthermore, one end of a lead wire 35 is connected to both ends of the conductive wire 31 respectively.

Terminals are attached to the other ends of the lead wires, respectively, and these terminals are attached to the connection case 41 as in the first embodiment. A connector 43 is formed by these terminals and the connection case 41, and the detection rods 89, the terminator 5, and the sensor connection unit 49 can be connected via the connector 43. Other configurations are
Since it is the same as the detection rod 3 of the bending force sensor 1 according to the first embodiment, the same reference numeral is given and the description is omitted.

FIG. 10 shows the detection rod 89 (89a, 89b,
89c) shows the connection state. In this mode of use 3
The detection rods 89a, 89b, 89c are installed at a predetermined distance from each other. One end of the cylindrical center conductor 93a is connected to the sensor connection portion 49, and the other end of the cylindrical center conductor 93a is connected to the other end of the center conductor 95a via the joint 50. One end of the center conductor 95a is connected to one end of a cylindrical center conductor 93b via a connecting means (not shown). The other end of the cylindrical center conductor 93b is connected to the other end of the center conductor 95b via the joint 50. One end of the center conductor 95b is connected to one end of a cylindrical center conductor 93c via a connecting means (not shown). The other end of the cylindrical center conductor 93c is connected to the conductive coil 31 via the terminator 5.

If the detection rods are installed in a wide area and the number of the detection rods is large, it is costly to connect the detection rods connected to the terminator in a multi-drop manner. Therefore, the detection rods are connected and the terminator 5 is connected. I want to connect to the end detection rod. However, when the detection rod 3 according to the first embodiment is used, the lower end of the center conductor 29 of the detection rod 3 and the upper end of the center conductor 29 of another detection rod 3 adjacent thereto must be connected. The connection work is troublesome. On the other hand, when the detection rod 89 according to the third embodiment is used, since the cylindrical center conductor 93 is connected via the center conductor 95, the connection between the cylindrical center conductors 93 is made. The construction is simple.

FIG. 11 shows a detection rod 99 according to the fourth embodiment. In this detection rod 99, four center conductors 101, 103, 105, and 107 are arranged on the central axis inside the casing 9 in a state where the four center conductors are electrically insulated through an electrically insulating separator 109. ing.
Four center conductors 101, 103, 105, 107
Are arranged in the same manner as in the first embodiment, and are configured to be connectable via a connector 43.

When the detection rod 99 is used, the electrical configuration of the sensor main body includes the center conductors 101, 103, 10
The first embodiment except that each of the DC circuits 5 and 107 is connected so as to form a DC circuit when it comes into contact with the conductive coil 31, and each DC circuit is provided with DC conduction detection means. Is the same as the bending force sensor 1 according to the first embodiment.

When the detection rod 99 is used, the center conductors 101, 103, 105, and 107 that come into contact with the conductive coil 31 change depending on the direction in which the bending force is generated. For example, when the detection rod 99 is buried in the ground so as to coincide with the direction shown in FIG. 12, when only the center conductor 101 comes into contact with the conductive coil 31, bending force toward the northeast, that is, landslide occurs. Is detected. Further, when the center conductor 101 and the center conductor 103 come into contact with the conductive coil 31, it is detected that a bending force, that is, a landslide has occurred in the east direction.

Although the embodiment of the present invention has been described in detail above, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. Are also included in the present invention. For example, a microphone may be connected to the terminator, and preferably a dynamic microphone may be connected in view of power consumption, so as to pick up a sound underground. Further, the detection rods according to the embodiments can be used in combination. In each of the embodiments, the AC circuit and the AC signal detecting means are provided. However, if the DC current supply state is detected, the generation of the bending force can be detected. Furthermore, the bending force sensor of the present invention is not limited to the occurrence of a landslide,
It can be used for detecting bending force.

[0032]

According to the bending force sensor of the present invention, generation of a bending force can be detected simply and accurately.

[Brief description of the drawings]

FIG. 1 is a perspective view of a detection rod of a bending force sensor according to a first embodiment.

FIG. 2 is a longitudinal sectional view of a detection rod of the bending force sensor according to the first embodiment.

FIG. 3 is a cross-sectional view in the AA direction of a detection rod of the bending force sensor according to the first embodiment.

FIG. 4 is an electrical configuration diagram of the bending force sensor according to the first embodiment.

FIG. 5 is a diagram showing a first mode of use of the bending force sensor according to the first embodiment.

FIG. 6 is a diagram illustrating a second mode of use of the bending force sensor according to the first embodiment.

FIG. 7 is a diagram illustrating a state when a landslide occurs in the detection rod according to the first embodiment.

FIG. 8 is a diagram illustrating a rod body of a bending force sensor according to a second embodiment.

FIG. 9 is a partially cutaway perspective view of a detection rod of a bending force sensor according to a third embodiment.

FIG. 10 is a diagram illustrating a connection state of a detection rod of a bending force sensor according to a third embodiment.

FIG. 11 is a partially broken perspective view of a detection rod of a bending force sensor according to a fourth embodiment.

FIG. 12 is a cross-sectional view of a detection rod according to a fourth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bending force sensor 3 Detection rod 5 Terminator 7 Sensor main body 9 Casing 27 Coil spring 29 Center conductor 31 Conductive coil 89 Detection rod 91 Conductor 95 Center conductor 97 Cylindrical center conductor 99 Detection rod 101, 103, 105, 107 Center conductor

Claims (5)

[Claims] 1. A casing having electrical insulation and flexibility, a first conductor disposed in the casing, a second conductor disposed in the casing, and the first conductor. A power supply for applying a DC voltage between the second conductor, and a DC conduction detection unit for detecting DC conduction between the first conductor and the second conductor, wherein the casing is bent. A contact point is formed between the first conductor and the second conductor, and a direct current is supplied through the contact point. 2. The bending force sensor according to claim 1, wherein the first conductor is a linear conductor provided in the casing, and the second conductor is disposed in the casing.
The bending force sensor, wherein the straight conductive wire is disposed at a predetermined distance from the second conductor. 3. The bending force sensor according to claim 1, wherein the first conductor is a center conductor disposed on a central axis in the casing, and the second conductor is an inner peripheral surface of the casing. A bending force sensor comprising a conductive coil disposed in contact with the sensor. 4. The bending force sensor according to claim 1, wherein the first conductor and the second conductor are connected via a capacitor, and the first conductor and the second conductor are connected to each other. Second
A bending force sensor comprising a power supply for applying an AC voltage between the conductor and a conductor. 5. The bending force sensor according to claim 1, wherein the first conductor is arranged on a central axis of the casing in a state where a plurality of center conductors are electrically insulated from each other. Bending force sensor characterized by the following.