CN218240089U - Force balance acceleration sensor - Google Patents

Abstract

A force balance acceleration sensor comprises a circuit device and an induction device which are electrically connected, wherein a rotating mechanism, a magnet and an optical coupler are arranged in the induction device, the rotating mechanism can rotate relative to the magnet, and when the rotating mechanism rotates, part of the structure of the rotating mechanism moves to a position between the paired optical couplers to shield a light beam; the rotating mechanism is provided with a coil which is electrically connected with the circuit device, the coil is arranged on the periphery of the magnet, and the north and south poles of the magnet are respectively positioned on two sides of the coil. The utility model discloses a rotary mechanism after the rotation is forced to reset to electromagnetic induction between the coil that does not directly contact and the magnet, guarantees the accuracy of the position that resets to correctly measure the acceleration.

Description

Force balance acceleration sensor

Technical Field

The utility model relates to a sensor, concretely relates to force balance acceleration sensor.

Background

Acceleration monitoring is a widely used technique, especially for monitoring acceleration during vehicle operation. The current acceleration monitoring is usually realized by adopting a piezoelectric acceleration sensor, a piezoresistive acceleration sensor or a capacitive acceleration sensor, and the like, the traditional acceleration monitoring mode has very high requirement on the processing precision of the sensor, otherwise, the error of the monitoring result is very large. Meanwhile, the sensitive material has larger temperature drift and time drift, so that higher requirements are placed on the use environment and the use method of the corresponding acceleration sensor. And due to the open loop test principle, the error of the measured output value has large change along with the change of the measured value, and the linearity of the sensor is greatly reduced.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the problem that requires much to equipment in the current acceleration monitoring mode, provided a force balance acceleration sensor, the inside relative motion that takes place of sensor when producing the acceleration to utilize the electromagnetic induction to make the part of motion reset, can accurately calculate the size of acceleration.

The utility model discloses a solve the technical means that above-mentioned problem adopted and do: a force balance acceleration sensor comprises a circuit device and an induction device which are electrically connected, wherein a rotating mechanism, a magnet and an optical coupler are arranged in the induction device, the rotating mechanism can rotate relative to the magnet, and when the rotating mechanism rotates, part of the structure of the rotating mechanism moves to a position between the paired optical couplers to shield light beams; the rotating mechanism is provided with a coil which is electrically connected with the circuit device, the coil is arranged on the periphery of the magnet, and the north and south poles of the magnet are respectively positioned on two sides of the coil.

Further, rotary mechanism includes coil former, pendulum roller and pendulum, and the winding has the coil on the coil former, and the pendulum passes through pendulum roller and coil former fixed connection, and when rotary mechanism rotated, the pendulum moved to sheltering from the light beam between the optical coupling that pairs.

Furthermore, a framework is arranged in the sensing device, and two ends of the rotating mechanism are connected with two ends of the framework respectively.

Furthermore, two ends of the framework are respectively fixed with a connecting ring, the connecting rings are connected with the rotating mechanism through conductive tension wires, one end of each tension wire is electrically connected to the coil, and the other end of each tension wire is electrically connected to the induction device.

Furthermore, the rotating mechanism also comprises an electrically conductive backing plate, two ends of the coil rack are respectively fixedly connected with one backing plate, the coil is electrically connected with the backing plates, the two tensile wires respectively penetrate through the central rings of the connecting rings and then are connected with the backing plates at the two ends of the coil rack, and the central line of the framework and the central line of the rotating mechanism are coincided with the connecting lines of the tensile wires.

Furthermore, the connecting ring is provided with an elastic sheet, one end of the tensile wire is fixed on the elastic sheet, and the elastic sheet is electrically connected with the circuit device.

Furthermore, protruding rings with through holes are arranged at two ends of the framework, the center ring of the connecting ring is sleeved on the protruding rings, and screws are arranged between the connecting ring and the framework for fixing.

Further, still be equipped with the opto-coupler board in the induction system, be equipped with upper plate and hypoplastron on the opto-coupler board, upper plate and hypoplastron are equipped with the opto-coupler of mating.

Furthermore, the induction device comprises a shell, the framework is fixed in the shell, a mounting hole is formed in the wall of the shell, and the optical coupling plate is fixed in the mounting hole.

Furtherly, the opto-coupler board is sealed to be fixed in the mounting hole, and the casing is inside to be filled there is damping fluid.

Further, the circuit device comprises a circuit board and a connecting column for fixing the circuit board, and the circuit board is electrically connected with the sensing device and is electrically connected to the outside of the sensor.

Further, the sensor further comprises a base body and a base plate, the circuit device and the induction device are fixed on the base plate and enclosed in an inner space enclosed by the base body and the base plate, a cable port is formed in the base body, and a cable connected with the circuit device is connected to the outside of the sensor through the cable port.

The beneficial effects of the utility model are that:

1. the utility model discloses a rotary mechanism after the rotation is forced to reset to electromagnetic induction between the coil that does not directly contact and the magnet, guarantees the accuracy of the position that resets to correctly measure the acceleration.

2. The utility model discloses required electric current size calculates the acceleration when reseing according to rotary mechanism, and calculation process accessible software realizes that the result is accurate.

3. The utility model discloses a very little stretch yarn of moment of torsion power is fixed rotary mechanism inside the skeleton, makes rotary mechanism only receive the pulling force of stretch yarn in both ends department, and the external force that the rotary mechanism that reduces as far as possible received at rotatory in-process influences.

4. The utility model discloses pack damping fluid in induction system's shell, make rotary mechanism soak in damping fluid, further reduce the external force influence that rotary mechanism received at rotatory in-process.

Drawings

FIG. 1 is a schematic diagram of an external structure of a force balancing acceleration sensor according to an embodiment;

FIG. 2 is a schematic view of the internal structure of FIG. 1 with the base removed, and the cable connected thereto is omitted;

FIG. 3 is a schematic diagram of the circuit device of FIG. 2;

FIG. 4 is a schematic structural diagram of the sensing device of FIG. 2;

FIG. 5 is a schematic structural view of FIG. 4 with the optocoupler board and the locking board removed;

FIG. 6 is a schematic diagram illustrating optical coupling induction of an induction device according to an embodiment;

FIG. 7 is a schematic view of the pendulum bob moving to block the light beam;

FIG. 8 is a schematic view of the skeleton and related components;

FIG. 9 is a schematic diagram illustrating the positional relationship between a connector, a rotating mechanism and a magnet according to an embodiment, and a tension wire connected between the elastic sheet and the backing plate is not shown;

FIG. 10 is a schematic view of the connecting head shown in FIG. 9;

FIG. 11 is a schematic view of the rotating mechanism of FIG. 9;

in the figure: 1. the welding wire welding machine comprises a base body, a seat plate, a cable port, a circuit device, a connecting column, a circuit board, a sensing device, a shell 311, a wiring port, a sealing cover 312, a locking plate 313, a mounting hole 314, an optical coupling plate 32, an upper plate 321, an upper plate 322, a lower plate 323, an optical coupler 33, a framework 33, an opening 331, a screw 332, a convex ring 333, a connecting ring 34, a spring plate 341, a spring plate 342, a wiring terminal 343, a welding wire point I, a rotating mechanism 35, a coil rack 351, a swinging roller 352, a pendulum 353, a pendulum bob 354, a welding wire point II, a pad 355 and a magnet 36.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

As shown in fig. 1, a force balance acceleration sensor (hereinafter referred to as sensor) includes a base body 1 and a seat plate 11 when viewed from the outside, the base body 1 and the bottom seat plate 11 enclose a cavity, the sensor is fixedly mounted on the base plate 11, the base body 1 is further provided with a cable port 12, and a cable connected with an internal structure of the sensor extends out of the cable port 12 and is connected to a device for calculation. The cable port 12 can be one or more and can be arranged on the top or the side wall of the holder body 1.

As shown in fig. 2, a circuit device 2 and an induction device 3 are disposed in an inner space enclosed by the seat body 1 and the seat plate 11, and both the circuit device 2 and the induction device 3 are fixed on the seat plate 11. As shown in fig. 3, the circuit device 2 includes a plurality of connection posts 21 and a circuit board 22 that is supported and connected by the connection posts 21. The circuit board 22 is connected to the induction device 3 through a cable, and a part of the cable of the circuit board 22 is also connected to a control center (not shown in the figure) through the cable port 12. The circuit board 22 provides power and reset current for the sensing device 3, and also transmits the reset current to the computing device, and the device software calculates acceleration according to the magnitude of the reset current.

As shown in fig. 4, the sensing device 3 is a sealed structure with a cavity inside formed by a housing 31 and a sealing cover 312, a connection port 311 is provided on the wall of the housing 31 (or the sealing cover 312), the internal cable is connected to the circuit board 22 through the connection port 311, and the cable can be fixed at the connection port 311 by waterproof adhesion, soldering, or the like in order to ensure the sealing inside the sensing device 3.

As shown in fig. 6, a frame 33 and an optical coupler plate 32 are arranged inside the sensing device 3, as shown in fig. 9, a rotating mechanism 35 and a magnet 36 are arranged inside the frame 33, the rotating mechanism 35 is used as a moving part, as shown in fig. 11, and comprises a backing plate 355, a coil frame 351, a pendulum roller 352 and a pendulum 353, the backing plate 355, the coil frame 351, the pendulum roller 352 and the pendulum 353 are rigidly connected, and when acceleration is generated, the rotating mechanism 35 integrally generates rotating motion. The pad 355 is made of a conductive material, the coil is wound on the bobbin 351 and is communicated with the pad 355, and the pendulum 353 is connected with the bobbin 351 and the pad 355 through the pendulum roller 352. As shown in fig. 8, an opening 331 is provided in a wall of the frame 33, the swing roller 352 extends from the opening 331, and the pendulum 353 is located outside the frame 33. As shown in fig. 7, an upper plate 321 and a lower plate 322 are arranged on the optical coupler plate 32, a pair of optical couplers 323 are arranged between the upper plate 321 and the lower plate 322, and two pairs of optical couplers 323 are provided, and the pendulum 353 extends between the upper plate 321 and the lower plate 322, and when the vehicle is stationary or advances at a constant speed, the pendulum 353 is located between the two pairs of optical couplers 323, so that light beams of any pair of optical couplers 323 are not blocked; when acceleration is generated, the pendulum 353 moves to a pair of optocouplers 323 to shield light beams, the optocouplers 323 are excited, a circuit between the rotating mechanism 35 and the circuit board 22 is conducted, and the circuit board 22 supplies power to the rotating mechanism 35. The two pairs of optical couplers are arranged, when the acceleration or deceleration is carried out, the pendulum 353 can always block the light beams of one pair of the optical couplers 323, and then the acceleration and the deceleration are distinguished through the control of a proper circuit program, namely the acceleration can be always detected. As shown in fig. 5, still be equipped with mounting hole 314 on the casing, opto-coupler plate 32 is installed in mounting hole 314 department, upper plate 321 and hypoplastron 322 are inside towards casing 31, in order to guarantee the inside leakproofness of induction system 3, can set up the sealing washer at the position that opto-coupler plate 32 and casing 31 contacted (like this embodiment, can set up the round sealing washer in opto-coupler plate 32's periphery), also can bond opto-coupler plate with waterproof glue is sealed at the casing (nevertheless this mode probably is not convenient for later maintenance and dismantles), the cable of being connected with opto-coupler plate 323 passes opto-coupler plate 32 and is connected with circuit board 22, of course, this cable also passes the department and seals. In this embodiment, in order to fix the optical coupler plate 32 to the housing 31 more stably, a locking plate 313 fixed to the housing 31 is further provided outside the optical coupler plate 32, a part of the locking plate 313 contacts with the optical coupler plate 32, and another part contacts with the housing 31, but a connection point may be only located between the locking plate 313 and the housing 31, for example, a threaded blind hole is provided in the housing 31, a through hole or a threaded hole is provided in the locking plate 313, and the locking plate 313 and the housing 31 are fixed by a bolt or the like. Of course, the optical coupler plate 32 and the sealing plate 312 may be formed integrally.

As shown in fig. 8, the frame 33 is provided at both ends thereof with protruding rings 333 having through holes in the middle, the two connecting rings 34 are respectively sleeved on the two protruding rings 333 through the central rings thereof, and each connecting ring 34 is fixed at both ends of the frame 33 by at least one screw 332. In this embodiment, the connection ring 34 is made of a conductive material, and the frame 33 is an insulator or at least a part of the frame is made of an insulating material, so that the two ends can be insulated. As shown in fig. 9 and 10, the connection ring 34 is provided with a spring 341 and a connection terminal 342, one end of the cable is connected to the connection terminal 342, and the other end is connected to the connection port 311, and since the connection ring 34 is made of a conductive material, the current flowing from the circuit board 22 flows to the spring 341 through the connection terminal 342. In the present embodiment, both ends of the tensile wire are fixedly connected to the elastic piece 341 and the backing plate 355 by welding, as shown in fig. 10 and 11, the elastic piece 341 has a first welding wire point 343, the backing plate 355 has a second welding wire point 354, when both ends of the tensile wire are respectively connected to the elastic piece 341 and the backing plate 355 at the first welding wire point 343 and the second welding wire point 354, the connection ring 34 is electrically connected to the coil of the coil frame 351, the entire rotating mechanism 35 is fixed to the framework 33 only by the tensile wires at both ends, the tensile wire connection line is the rotation axis of the entire rotating mechanism 35, and the magnet 36 can be fixed in the framework 33 by its side wall (for example, by using an adhesive) and no relative motion is generated between the magnet 36 and the framework during the operation. In order to ensure that the rotating mechanism 35 can be reset smoothly after rotating, the magnet 36 in this embodiment is a cylindrical permanent magnet, and its north and south ends are distributed along the axial direction. That is, the bobbin 351 is disposed at the outer circumference of the magnet 36 without contact between the entire rotating mechanism 35 and the magnet 36, the central axis of the bobbin 351 coincides with the central axis of the magnet 36 and coincides with the tensile wire connecting line, and the north and south poles of the magnet 36 are respectively located at both sides of the bobbin 351 when the bobbin is stationary or moving at a constant speed. When the rotating mechanism 35 rotates, the coil is energized to generate a magnetic field, which repels the magnet 36, thereby forcing the rotating mechanism 35 to reset.

In order to avoid the influence of external force on the rotating mechanism 35 in the moving process (except gravity of course) as much as possible and to avoid impurities from entering the internal space of the sensing device 3 as much as possible, non-conductive damping liquid such as silicone oil is filled in the shell 31 and sealed, at this time, the framework 33 can also be fixed in the shell 31 in an adhesive manner to ensure the sealing effect, and of course, the damping liquid is also filled in the framework 33, so that the whole sensing device 3 has a better anti-vibration effect, and the error of the required current size when the rotating mechanism is reset is also reduced.

The above embodiments are provided only for the purpose of illustration, not for the limitation of the present invention, and those skilled in the relevant art can make various changes or modifications without departing from the spirit and scope of the present invention, so all equivalent technical solutions should also belong to the protection scope of the present invention, and the protection scope of the present invention should be defined by the claims.

Claims (10)

1. A force balanced acceleration sensor characterized by: the device comprises a circuit device and an induction device which are electrically connected, wherein a rotating mechanism, a magnet and an optical coupler are arranged in the induction device, the rotating mechanism can rotate relative to the magnet, and when the rotating mechanism rotates, part of the structure moves to a position between the paired optical couplers to shield a light beam; the rotating mechanism is provided with a coil which is electrically connected with the circuit device, the coil is arranged on the periphery of the magnet, and the north and south poles of the magnet are respectively positioned on two sides of the coil.

2. The force-balanced acceleration sensor of claim 1, characterized in that: the rotating mechanism comprises a coil rack, a swinging roller and a pendulum bob, a coil is wound on the coil rack, the pendulum bob is fixedly connected with the coil rack through the swinging roller, and when the rotating mechanism rotates, the pendulum bob moves to a position between the paired optical couplers to shield light beams.

3. The force-balanced acceleration sensor of claim 2, characterized in that: the induction device is internally provided with a framework, and two ends of the rotating mechanism are respectively connected with two ends of the framework.

4. The force-balanced acceleration sensor of claim 3, characterized in that: the two ends of the framework are respectively fixed with a connecting ring, the connecting rings are connected with the rotating mechanism through conductive tension wires, one end of each tension wire is electrically connected to the coil, and the other end of each tension wire is electrically connected to the induction device.

5. The force-balanced acceleration sensor of claim 4, characterized in that: the rotating mechanism further comprises an electrically conductive backing plate, two ends of the coil rack are fixedly connected with one backing plate respectively, the coil is electrically connected with the backing plate, the two tensile wires penetrate through the central rings of the connecting rings and then are connected with the backing plates at the two ends of the coil rack respectively, and the central line of the framework and the central line of the rotating mechanism are coincided with the connecting lines of the tensile wires.

6. The force-balanced acceleration sensor of claim 4, characterized in that: the connecting ring is provided with a spring plate, one end of the tensile wire is fixed on the spring plate, and the spring plate is electrically connected with the circuit device.

7. The force-balanced acceleration sensor of claim 4, characterized in that: the two ends of the framework are provided with convex rings with through holes, the center ring of the connecting ring is sleeved on the convex rings, and screws are arranged between the connecting ring and the framework for fixing.

8. The force-balanced acceleration sensor of claim 1, characterized in that: an optical coupling plate is further arranged in the induction device, an upper plate and a lower plate are arranged on the optical coupling plate, and paired optical couplings are arranged on the upper plate and the lower plate.

9. The force-balanced acceleration sensor of claim 8, characterized in that: the induction device comprises a shell, the framework is fixed in the shell, a mounting hole is formed in the wall of the shell, and the optical coupling plate is fixed in the mounting hole.

10. The force balanced acceleration sensor of claim 9, characterized in that: the optical coupling plate is fixed in the mounting hole in a sealing mode, and damping liquid is filled inside the shell.

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