JPH0725737Y2 - Magnetic detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a magnetic detection device for measuring geomagnetism and the like.

(B) Conventional Technology In general, a magnetic detection device is installed in an inner space of a casing.
A sensor body supported by an axial gimbal mechanism is provided. The biaxial gimbal mechanism is composed of a short shaft that is supported between both side pieces of the frame body and a long axis that is fixed to both end pieces of the frame body and that projects in a direction perpendicular to the short axis. The shaft is supported by a bearing in the casing, and the tip of the long shaft is directly connected to a hair spring for power supply. The sensor body is hung on the short axis and is fed from a hair spring through a lead wire. Therefore, the sensor body is held by the gimbal mechanism so as to be rotatable in the major axis direction and the minor axis direction, and the weight attached to the lower part
It is set to always orient in the vertical direction.

(C) Problem to be Solved by the Invention The above magnetic detection device is provided with a clamp means for preventing rotation of the sensor body. The clamp means is composed of a plurality of locking pieces that are directly connected to the rotation shaft of the motor, and the rotation of each rotation shaft causes each locking piece to stand upright with respect to the long axis. The vertical state of the sensor body is clamped by each of the upright locking pieces. That is, the plurality of upright locking pieces forming the clamp means are arranged in a circle around the sensor body in the vertical state so that the sensor body is sandwiched.

For example, when the magnetic detection device is dropped on the seabed to measure the earth's magnetism, the sensor body in a vertical state is clamped by a locking piece in advance and then dropped. As a result, the sensor body is protected from vibrations and impacts that occur when it is dropped. If the ground surface of the magnetic detection device is a flat surface, the sensor body (the detection axis of the sensor body) is vertically positioned in the clamped state. However, when the ground contact surface is an inclined surface, the clamp of the sensor main body is once released, that is, the sensor main body is returned in the vertical direction and then clamped again.

However, in this clamp means, a locking piece stands upright with respect to the long axis to embrace the sensor body. Therefore, when the clamp means is released (the locking piece is laid down) and the sensor body that has returned to the vertical direction is clamped by this clamping means (locking piece), the angle shifts due to the inclination of the grounding surface. It is clamped in the open state. In other words, the sensor body is clamped perpendicularly to the long axis and is not vertically oriented,
There was a disadvantage that generated a detection error.

It is an object of the present invention to provide a magnetic detection device that can always orient the sensor body in the vertical state regardless of the inclination of the ground surface.

(D) Means and Actions for Solving the Problem In order to achieve this object, the magnetic detection device of the present invention has the following configuration.

The magnetic detection device has a sensor body supported on a short axis of a biaxial gimbal mechanism including a short axis and a long axis arranged in a direction perpendicular to the short axis. Stop stopper plate attached to the end of the long axis, a stopper that advances and retreats in the long axis direction and presses against the stop receiver plate so that it can come into contact with and separate from it, and locks rotation of the long axis. A clamp mechanism composed of a motor for advancing and retreating is arranged.

In the magnetic detection device having such a configuration, clamping means for clamping the rotation of the sensor body (rotation of the long axis) in the direction parallel to the long axis is provided. This clamp means is a disc-shaped stop receiving plate attached to the end of the long shaft,
It comprises a stopper for pressing and fixing the stop receiving plate, and a motor for moving the stopper forward and backward with respect to the stop receiving plate. The flat triangular stopper is provided with screw holes at the tops of three points, and the head is screwed into the screw shaft of the gear in the screw holes. Further, this screw shaft gear is screwed with the gear of the motor rotating shaft via a large relay gear.
Therefore, when the motor is rotated, the screw shaft rotates, and at the same time, the stopper linearly moves in the long axis direction. Then, the stopper comes into pressure contact with the opposing stop receiving plate. Both the stop receiving plate and the stopper are formed with conical surface portions that descend and incline inward. The corresponding conical surface portions are pressed into close contact with each other, whereby rotation of the major axis, that is, rotation of the sensor body in the minor axis direction is prevented. However, the rotation of the sensor body in the major axis direction is always allowed by the rotation of the minor axis, but the rotation of the sensor body in the major axis direction receives the minor axis (the major axis is projected. The rotation range is limited by the frame body, and there is no problem.

Therefore, when the sensor body is clamped by the clamp means and sinks to the seabed, the sensor body is completely protected from vibration and impact. Further, when the ground contact surface is a flat surface, or when the longitudinal direction (major axis direction) of the magnetic detection device and the inclined surface (ground contact surface) are in a parallel state, the free short axis without releasing the clamping means. The sensor body is always oriented in the vertical state only by rotating. If the ground contact surface is inclined,
And when the inclination angle is not parallel to the longitudinal direction (long axis direction) of the magnetic detection device but is tilted, that is, when the sensor body is displaced in the short axis direction and is grounded in a state where it is not in a vertical state, It is necessary to release the clamp means so that the sensor body is free to rotate in the short axis direction. When the clamp means is released and the sensor body returns to the vertical state, the clamp means is actuated again to lock the rotation of the long axis (prevent rotation of the sensor body in the short axis direction). In this case, the clamping means locks the sensor body parallel to the long axis. Therefore, no matter how the ground plane is inclined, the sensor body can be locked in the vertical state, and accurate magnetic detection can be realized.

(E) Embodiment FIG. 2 is a sectional view showing a concrete embodiment of the magnetic detection device according to the present invention.

The magnetic detection device has two partition plates 11 inside the casing 1,
The chamber 11 is divided into three chambers by 11, and the biaxial gimbal mechanism 2 and the sensor body (magnetic sensor) 3 supported by the gimbal mechanism 2 are arranged in the central chamber 12 and the clamping means 4 is provided in one chamber 13 on both sides. The hair springs 5 for power supply are provided in the other accommodation chambers 14, respectively.

The casing 1 is open at one end (on the accommodation chamber 14 side), and a bellows 15 is provided on this opening (on the accommodation side of the hair spring 5). In use, the casing 1 is mounted in, for example, a cylindrical outer case 1a (see FIG. 1). The bellows 15 expands and contracts due to the volume change of oil (described later) 6 due to the temperature change in the casing 1, and absorbs the change in the internal pressure of the casing 1 to prevent a measurement error.

As shown in FIG. 1, the biaxial gimbal mechanism 2 has a short shaft 22 mounted between both side pieces of a rectangular frame body 21.
The long shaft 23 is projected on both end pieces of the (projected in the direction perpendicular to the short shaft 22)
Then configured. Both ends of the long shaft 23 are supported by bearings 16 and 16 arranged in through holes of the partition walls 11 and 11, respectively. One end portion 23a of the long shaft 23 penetrating the bearing portions 16 and 16 is directly connected to the hair spring 5 of the accommodation chamber 14. Further, the other tip portion 23b projects into the accommodating chamber 13, and a stop receiving plate 41 described later is attached to this projecting end (see FIG. 2).

The sensor body (magnetic sensor) 3 is fixedly hung on the short shaft 22 and has a weight 31 attached to the lower portion. The sensor body 3 is moved by the biaxial gimbal mechanism 2 in the major axis direction (rotation of the minor axis 22) and the minor axis direction (rotation of the major axis 23, hairspring 5).
It is rotatable so that it is always oriented in the vertical direction.

The hair spring 5 provided in the accommodation chamber 14 is installed in a box 51 as shown in FIG. The box 51 has a window hole 52 in the surface of one side plate and a through hole 53 in the other side plate. The box body 51 is fixed to the partition plate 11 with the window hole 52 corresponding to the receiving portion 16. The spiral hair spring 5 has one end fixed to the side plate with a screw 54 and the other end connected to the tip portion 23a of the long shaft 23. A lead 56 connected to one end (terminal) 55 of the hair spring 5 is pulled out from the casing (accommodation chamber 14) 1 and connected to a power supply. That is, the sensor main body (processing circuit section) 3 is connected to the power source via the lead 56, the hair spring 5, the long shaft 23, and the lead 57 to supply power.

The accommodation chambers 12, 13, 14 in the casing 1 are communicated with each other by the through holes 17 of the partition plates 11, 11. That is, an accommodating chamber 13 for accommodating the clamp means 4 described later, an accommodating chamber 12 for accommodating the gimbal mechanism (sensor body 3) 2, and a bellows 15.
The box bodies 51 accommodating the hair springs 5 and the hair springs 5 are set to be in communication with each other, and the buffer oil 6 is filled in each box. By viscous and fluid resistance of the oil 6, the shock absorbing properties of the hair spring 5 and the sensor body 3 and the oil supply to the bearing portions 16 of the gimbal mechanism 2 are realized.

The feature of this invention resides in that the clamp means 4 for locking the rotation of the long shaft 23 in the long axis direction is provided.

As shown in FIG. 1, the clamping means 4 includes a stop receiving plate 41 attached to the tip of the long shaft 23 and the stop receiving plate 41.
It is composed of a stopper 42 that comes into contact with and separates from 41, and a driving means 43 that directly moves the stopper 42.

In the embodiment, the stopper 42 is a flat plate having a triangular shape, has a circular hole 42a in the surface thereof, and has a conical surface portion 42b protruding downward inwardly on the outer periphery of the circular hole 42a. Furthermore, 3 of stopper 42
A screw hole 42c is provided on each of the apexes.

The drive means 43 is a back surface of the stopper 42, that is, a conical surface portion.
The large-diameter relay gear 43a provided on the opposite side of the 42b and the screw hole
Screw shaft 43c with a small-diameter gear 43b on the head that engages with 42c
And an electrostrictive motor 43d. The rotating gear 43e of the electrostrictive element motor 43d and the relay gear 43a are screwed together, and this relay gear 43a
And each screw shaft gear 43b are screwed together. Above, screw shaft gear 4
The screw shaft 43c of 3b is supported by the casing 1, and the stopper 4
2 is supported (see Fig. 2).

Further, a conical surface portion 41a corresponding to the conical surface portion 42b of the stopper 42 is provided on the outer peripheral portion of the disc-shaped stop receiving plate 41 attached to the tip of the long shaft 23.

In the magnetic detection device having such a configuration, the clamp means 4 for preventing the rotation of the sensor body 3 in the direction parallel to the long axis 23 is provided. In the clamp means 4, when the small gear 43e of the rotary shaft is rotated by the drive of the electrostrictive motor 43d, the large relay gear 43a is rotated, and the screw shaft 43 is further mounted via the gear 43b of the head.
c rotates. As a result, the stopper 42 linearly moves on the screw shaft 43c. When the stopper 42 moves in the direction of the long axis 23, the conical surface portion 42b of the stopper 42 presses against the conical surface portion 41a of the stop receiving plate 41 that opposes, and locks the rotation of the long shaft 23. That is, rotation of the sensor body 3 in the short axis direction is prevented. However, the rotation of the sensor body 3 in the long axis direction is
Although the rotation of the short shaft 22 is always permitted, the rotation of the sensor main body 3 in the long axis direction is limited by the frame body 21 that supports the short shaft 22 (the long shaft projects). There is no problem.

Therefore, when the sensor body 3 is clamped by the clamp means 4 and dropped onto the seabed, the sensor body 3 is completely protected from vibration and impact. Further, when the ground contact surface is a flat surface or when the longitudinal direction of the magnetic detection device and the inclined surface (ground contact surface) are parallel to each other, the free rotation of the short shaft 22 is possible without releasing the clamp means 4. Only the sensor body 3
Always orients vertically. If the ground plane is inclined and the longitudinal direction (long axis direction) of the magnetic detection device and the inclination angle are not parallel, the sensor body 3 is displaced in the short axis direction and is in a vertical state. In the case where the sensor unit 3 is grounded in a state where the sensor unit 3 does not come into contact, the clamp unit 4 is released to allow the sensor body 3 to rotate in the short axis direction, and the clamp unit 4 is activated again when the sensor body 3 is in the vertical state. Then, the rotation of the long shaft 23 is locked (the rotation of the sensor body 3 in the short axis direction is blocked). In this case, since the clamp means 4 locks the sensor body 3 in a state parallel to the long axis 23, the sensor body 3 can be locked in a vertical state regardless of how the grounding surface is inclined. , Accurate magnetic detection can be achieved.

Further, in this embodiment, an electrostrictive element motor 43d is adopted as a drive source for the clamp means 4. Therefore, the sensor 3 detects the magnetic distortion of the electric motor (coil motor) which has been conventionally used, and the disadvantage such as an error is eliminated. Further, in the case of the electrostrictive motor 43d, since it rotates in one direction, the disadvantage that the clamped state is loosened due to vibration or reaction of the sensor body 3 in a stopped state like a conventional electric motor is eliminated.

(F) Effect of the Invention In this invention, as described above, the rotation of the long axis of the biaxial gimbal mechanism is locked by the clamp means that moves forward and backward in the direction parallel to the long axis. No matter what the slope is, the sensor main body can be always oriented in the vertical direction and the detection accuracy can be improved.

Further, since the clamp means is automatically operated by the motor, the release / operation of the clamp means can be remotely controlled from the sea when the magnetic detection device is grounded on the seabed, for example, and the diver operates under the control of the device. It also has the effect that there is no need.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example magnetic detection device, and FIG. 2 is a sectional view showing the example magnetic detection device. 2: 2-axis gimbal mechanism, 3: sensor body, 4: clamping means, 4
1: Stop support plate, 42: Stopper.

Claims (1)

[Scope of utility model registration request] 1. A magnetic detection device in which a sensor main body is supported on a short axis of a biaxial gimbal mechanism composed of a short axis and a long axis arranged in a direction perpendicular to the short axis. Stop stopper plate attached to the end of the long axis, a stopper that advances and retreats in the long axis direction and presses against the stop receiver plate so that it can come into contact with and separate from it, and locks rotation of the long axis. A magnetic detection device comprising a clamp means composed of a motor for advancing and retreating.