JP3166674B2 - Magnetic detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic detector for measuring geomagnetism and the like.

[0002]

2. Description of the Related Art A conventional magnetic detecting device is shown in FIGS. FIG. 3 is a perspective view, and FIG. 4 is a sectional view thereof. As shown in FIG. 3, the magnetic detection device includes a sensor main body 3 supported by a biaxial gimbal mechanism 2 in a casing 1a thereof.
(Magnetic sensor and signal processing circuit). The two-axis gimbal mechanism 2 includes a short shaft 22 having a bearing portion provided on a pair of side frames facing the frame 21 and a long shaft 23 fixed to the other pair of side frames in a direction perpendicular to the short axis 22. 4, both ends of the long shaft 23 are supported by bearings 16, 16 provided in the casing 1a as shown in FIG. Tip 23 of major axis 23
The power supply lead wire 57 from the sensor main body 3 taken out from a is connected to one end of the hair spring 5 and the other end is taken out to the outside via a screw 54. Therefore, the sensor main body 3 can be rotated in both directions of the long axis 23 and the short axis 22 by the two-axis gimbal mechanism 2, and the sensor main body 3 is always kept in the vertical direction by the weight 31 provided thereunder. . However, when the magnetic detector is transported or installed underwater, a clamp mechanism for the sensor main body 3 is required to protect the sensor main body 3 from vibration and impact. Mechanisms have been used. In FIG. 4, the clamp mechanism 4 is pressed against a stopper receiving plate 41 fixed to the long axis end 23 b of the biaxial gimbal mechanism 2 so as to advance and retreat in the long axis direction and to be able to contact and separate from the stopper receiving plate 41. And the long axis 23
And a motor 4 for moving the stopper 42 forward and backward with respect to the stopper receiving plate 41.
3d. Flat plate-shaped triangular stopper 4
3, a screw hole 42c is provided at the top of each of three points as shown in FIG. 3, and a screw shaft 43c whose head is a gear is screwed into the screw hole 42c. Further, the screw shaft gear 43b is screwed with the motor rotation shaft gear 43e via the relay large gear 43a. Therefore, the motor 43
When d is rotated, the screw shaft 43c rotates, and at the same time, the stopper 42 directly moves in the long axis direction. Then, the stopper 42 comes into pressure contact with the opposing stopper receiving plate 41, and the rotation of the sensor main body 3 in the short axis direction is prevented. Rotation in the long axis direction
Although limited by the frame 21 that supports the short axis, the accommodation chamber 13 that accommodates the clamp mechanism 4 shown in FIG. 4 and the accommodation chamber 1 that accommodates the biaxial gimbal mechanism 2 in which the sensor body 3 is suspended.
2, the box body 51 accommodating the bellows 15 and the hair spring 5 is communicated through the through hole 17, and the shock absorbing oil 6 is sealed to protect the sensor main body 3 from vibration and shock.

[0003]

The conventional magnetic detecting device is constructed as described above. However, the clamp means of the sensor main body has a stopper mounted on a stopper receiving plate fixed to the long axis in one direction of the long axis. Since the pressing is performed, an excessive thrust load is applied to the bearings provided at both ends of the long shaft, and there is a problem that the bearings are damaged.

Further, in order to suppress the movement of the sensor in the longitudinal direction, oil is sealed to reduce the coefficient of friction of the clamp mechanism. As a result, the clamp function is weakened, and the stopper receiving plate is provided with a larger pressing force. Have to be pressed into contact with each other, and it takes a lot of time to remove the oil in the event of a failure or to fill the oil after the repair.

The present invention has been made in view of the above circumstances, and provides a magnetic detection device having a clamp mechanism that eliminates a thrust load on a bearing of a bearing portion and does not require oil filling. The purpose is to:

[0006]

In order to achieve the above object, a magnetic detecting device according to the present invention has a sensor main body suspended from a short axis of a two-axis gimbal mechanism in which a short axis and a long axis are connected at right angles. In the magnetic detection device described above, the disc brake plate attached to the end of the long axis and the longitudinal direction move forward and backward in opposite directions to each other, sandwiching the disc brake plate, and pressing and locking the rotation of the long axis. A clamp mechanism including a pair of clamp plates is provided.

Further, a cushion is provided on the sensor main body portion that comes into contact with a frame that bears the short axis by rotating the sensor main body vertically suspended on the short axis of the biaxial gimbal mechanism in the long axis direction.

The magnetic detection device of the present invention is constructed as described above, and has a clamp mechanism in which thrust loads are not applied to the bearings at both ends of the long shaft, and an impact of the sensor body in the short-axis direction without oil filling. It is possible to obtain a magnetic detection device capable of suppressing the force.

[0009]

1 and 2 show an embodiment of a magnetic detecting device according to the present invention. FIG. 1 is a perspective view thereof, and FIG. 2 is a sectional view thereof. In the drawings, components having the same functions as those of the conventional example shown in FIGS. 3 and 4 are denoted by the same reference numerals. In FIG. 2, circular blocks 11a, 11
b and 11c are connected by four connecting rods 11d and 11e, respectively.
The frame assembly 1 is constructed, and three functional areas 12, 13, 1
4 are formed. The sensor body 3 containing the two-axis gimbal mechanism 2, the magnetic sensor supported by the two-axis gimbal mechanism 2, and its processing circuit is provided in the central functional area 12, and the right functional area 13 is provided.
And a hair spring 5 for power supply in the functional area 14 on the left side.

As shown in FIG. 1, the two-axis gimbal mechanism 2 has a rectangular frame 21 having a long shaft 23 projecting therefrom.
3 are the circular blocks 11a, 11
b. One end portion 23 of the long shaft 23 penetrating the bearing portion 16
a is connected to the hair spring 5 of the functional area 14. Further, the other tip portion 23b is connected to the functional region 13
And a disc brake plate 4 to be described later
4 is installed.

The sensor main body 3 is suspended from the short shaft 22 and has a weight 31 attached to a lower portion thereof. The sensor main body 3 is configured to be rotatable in a long axis direction and a short axis direction, and is always positioned in a vertical direction. ing. The sensor body 3 has a cushion 32 made of an elastic material wound around a portion where the sensor body 3 comes into contact with the frame with respect to the rotation in the long axis direction.

The hair spring 5 provided in the functional area 14 is connected to the tip 23a of the long shaft 23. The other end of the hair spring 5 is connected to a terminal 54 and is taken out through a lead 56. That is, the sensor main body 3 is connected to the power supply via the lead 56, the hair spring 5, the long shaft 23, and the lead 57, and is supplied with power.

As shown in FIG. 1, a feature of the present invention is that a disc brake plate 44 attached to the distal end of the long shaft 23 and clamp plates 44a and 44b which are pressed against the disc brake plate 44 so as to be able to come and go. Driving means 43 for moving;
In addition, a pair of the clamp plates 44a and 44b which advance and retreat in opposite directions in the long axis direction, sandwich the disc brake plate 44, and lock the rotation of the long shaft 23 are provided. The disc brake plate 44 is a non-magnetic metal disc of about 0.5 mm, and the clamp plates 44a and 44b are provided with a rubber O-ring 44e for strengthening the frictional force with the disc brake plate 44, and near the outer periphery. A plurality of small holes for passing the rotation stopper 44c are provided. The positions of the small holes are selected so that the distance between the clamp plates 44a and 44b and the disc brake plate 44 is equal. The driving means 43 is a right-hand screw on the left and a left-hand screw on the right from the center of the screw shaft.
The clamp shaft 44d is driven by an electrostrictive motor 43d through the clamp plates 44a and 44b.

When the clamp shaft 44d is rotated by the driving of the electrostrictive motor 43d, the clamp plate 44a moves rightward and the clamp plate 44b moves leftward. Then, the two clamp plates sandwich the disc brake plate 44 and come into pressure contact from both sides to prevent the rotation of the long shaft 23. At this time, even if the plane portion at the axial position of the disc brake plate 44 and the plane portion pressed by the clamp plate are not on the same plane, the disc brake plate 44 can absorb the distortion with a thin metal plate. Prevents the disc brake plate 44 from rotating, and does not apply a thrust load to the bearing. With respect to the rotation of the sensor body 3 in the long axis direction, the rotation range is limited by the frame 21 that supports the short axis 22, and the vibration and impact are reduced by the cushion 32 of the sensor body. Absent.

Accordingly, when the sensor body 3 is transported in a state clamped by the clamp mechanism 4 or dropped on the seabed, the sensor body 3 is completely protected from vibration and impact.
Also, the ground plane is a flat surface or the two-axis gimbal 2 of the magnetic detection device.
When the sensor body 3 is in a state parallel to the long axis direction, the sensor body 3 is always positioned in the vertical direction only by the free rotation of the short shaft 22 without releasing the clamp mechanism 4. If the long axis direction and the inclination angle of the magnetic detection device are not parallel and swing obliquely, the rotation of the sensor body 3 in the short axis direction is free, and when the sensor body 3 is in the vertical state, The clamp mechanism 4 is operated again to lock the rotation of the long shaft. In this case, since the clamp mechanism 4 locks the sensor main body 3 in a state parallel to the long axis 23, the sensor main body 3 can be locked in a vertical state regardless of how the installation surface is inclined, Accurate magnetic detection can be achieved.

[0016]

The magnetic detecting device of the present invention is constructed as described above, and rotates the long axis of the two-axis gimbal mechanism by moving the disk brake plate held on the long axis in a direction parallel to the long axis. This is a locking method in which a pair of clamp plates sandwiches and presses against each other, so that the sensor main body can always be located in the vertical direction even if the magnetic detection surface is any inclined surface, and the detection accuracy can be improved. it can. Further, by providing the sensor body 3 with a cushion, it is possible to eliminate the influence of vibration and impact without filling oil.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a magnetic detector according to the present invention.

FIG. 2 is a sectional view showing an embodiment of the magnetic detector of the present invention.

FIG. 3 is a perspective view showing a conventional magnetic detector.

FIG. 4 is a sectional view showing a conventional magnetic detector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Frame assembly 1a ... Casing 2 ... 2-axis gimbal mechanism 3 ... Sensor main body 4 ... Clamp mechanism 5 ... Hair spring 6 ... Oil 11a, 11b, 11c ... Circular block 11d, 11e ... Connection rod 12, 13, 14 ... Functional area DESCRIPTION OF SYMBOLS 15 ... Bellows 16 ... Bearing part 17 ... Through-hole 21 ... Frame 22 ... Short axis 23 ... Long axis 23a, 23b ... Tip part 31 ... Weight 32 ... Cushion 41 ... Stopper receiving plate 42 ... Stopper 42c ... Screw hole 43 ... Drive Means 43a ... relay large gear 43d ... motor 43e ... gear 44 ... disk brake plate 44a, 44b ... clamp plate 44c ... rotation stop 44d ... clamp shaft 51 ... box body 54 ... screw 56, 57 ... lead wire

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-150024 (JP, A) JP-A-59-100883 (JP, A) JP-A-59-3375 (JP, A) JP-A-63-1988 124974 (JP, A) Japanese Utility Model Hei 2-77688 (JP, U) Japanese Utility Model Showa 57-205095 (JP, U) Japanese Utility Model Utility Model 1-126086 (JP, U) Japanese Utility Model Utility Model 1-1118384 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G01R 33/00-33/18

Claims (2)

(57) [Claims] 1. A magnetic detecting device in which a magnetic sensor and a sensor main body containing a signal processing circuit are suspended from a short axis of a two-axis gimbal mechanism having a short axis and a long axis set at right angles. A clamp mechanism comprising a disc brake plate attached to an end and a pair of clamp plates which reciprocate in opposite directions in the major axis direction, sandwich the disc brake plate, and lock the rotation of the major axis. A magnetic detection device characterized by the above-mentioned. 2. A cushion is provided at a portion of the sensor main body that comes into contact with a frame that bears the short axis with respect to a rotation of the sensor main body vertically suspended on a short axis of the two-axis gimbal mechanism in a long axis direction. The magnetic detection device according to claim 1, wherein: