CN218787860U

CN218787860U - Force sensor

Info

Publication number: CN218787860U
Application number: CN202220747807.1U
Authority: CN
Inventors: 冉秋宏
Original assignee: Shenzhen Innoview Technology Co ltd
Current assignee: Shenzhen Innoview Technology Co ltd
Priority date: 2022-03-31
Filing date: 2022-03-31
Publication date: 2023-04-04
Anticipated expiration: 2032-03-31

Abstract

The utility model discloses a force sensor relates to sensor technical field. The utility model discloses an elastomer, quartz section, strainometer and based on measurement circuit of strain gauge principle and based on the measurement circuit of quartz piezoelectricity principle, wherein, quartz section and strainometer set gradually on the elastomer, have seted up the mounting hole on the elastomer, and quartz section and strainometer all install on the elastomer through the mounting hole. The load acts on the elastic body, the elastic body deforms, the quartz slice and the strain gauge synchronously deform along with the elastic body, the surface of the quartz slice generates charges due to the piezoelectric effect, and the resistance value of the strain gauge changes; the measuring circuit based on the piezoelectric principle and the measuring circuit based on the strain type principle respectively output electric signals proportional to loads, the device has the function of independently outputting two signals based on two different effects, the use in various occasions can be met, the two signals can be independently used and can also be mutually compensated for use, and the measuring accuracy of the sensor is ensured.

Description

Force sensor

Technical Field

The utility model relates to a force sensor technical field specifically is a force sensor.

Background

The force sensor is a device for converting the force magnitude into corresponding electric signals, the mechanical quantity is mainly divided into static force and dynamic force according to the action mode, the strain principle is mainly adopted for measuring the static force, and the piezoelectric principle is mainly adopted for measuring the dynamic force. The accuracy is not high when the strain principle measures dynamic force, and the piezoelectric principle cannot meet the requirement of static force measurement. The engineering field usually needs two measurement modes to be carried out synchronously, for example, the axle weight of an automobile is a dynamic force when the automobile runs, and the axle weight of the automobile is a static force when the automobile is static.

SUMMERY OF THE UTILITY MODEL

The utility model provides a force sensor to solve the problem in the background art.

In order to achieve the above object, the utility model provides a following technical scheme: a force sensor comprises an elastic body, a quartz slice, a strain gauge, a measurement circuit based on a strain type principle and a measurement circuit based on a quartz piezoelectric principle, and is characterized in that: the quartz slice and the strain gauge are sequentially arranged on the elastic body. The elastic body is provided with a mounting hole, and the quartz slice and the strain gauge are mounted on the elastic body through the mounting hole.

As an optimal technical scheme of the utility model, the elastomer can set up to cantilever beam structure, column type structure, parallel beam structure, solid strutbeam structural style according to the condition of use occasion atress.

As an optimized technical solution of the present invention, the piezoelectric effect mode according to the stress structure of the elastic body and the quartz slice includes any one of the following: thickness compression, length compression, planar cutting deformation.

As an optimal technical scheme of the utility model, by the measurement circuit based on strain formula principle that the strainometer is constituteed is provided with zero compensation, zero temperature compensation, linear compensation, sensitivity temperature compensation or sensitivity compensation.

As an optimized technical solution of the present invention, a measuring circuit based on piezoelectric effect, which is composed of quartz slices, is provided with a charge amplifier.

As an optimal technical scheme of the utility model, based on the measuring circuit of quartz chip piezoelectricity principle with based on the measuring circuit of strainometer strain formula principle exports the signal of telecommunication proportional to load respectively. The use of both signals includes any of the following: used independently and mutually compensated.

Compared with the prior art, the utility model provides a force sensor possesses following beneficial effect: this force sensor, through setting up the elastomer, quartzy section and strainometer, when the vehicle passes through the road surface, exert pressure to the elastomer through load effect portion, quartzy section and strainometer are along with the synchronous deformation of elastomer, through quartzy section and strainometer cooperation based on the measuring circuit of strain gauge principle and based on the measuring circuit of quartzy piezoelectricity principle, compare in conventional force sensor, the device has the function of two kinds of signal independent output, measurement accuracy has effectively been guaranteed, the device structure is retrencied, the commonality is high, vehicle to under high-speed or the low-speed state keeps good weighing efficiency.

Drawings

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a schematic diagram showing the deformation state of the quartz slice of the present invention;

fig. 3 is a schematic diagram of the strain gauge according to the present invention.

In the figure: 1. an elastomer; 2. slicing quartz; 3. a strain gauge; 4. an elastic fixing portion; 5. a load application portion.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-3, the present invention discloses a force sensor, which comprises an elastic body 1, a quartz slice 2, a strain gauge 3, a measurement circuit based on strain type principle and a measurement circuit based on quartz piezoelectric principle, wherein the quartz slice 2 and the strain gauge 3 are sequentially disposed on the elastic body 1. Set up the blind hole that quantity is no less than one on the elastomer 1, quartz chip 2 and strainometer 3 are all through blind hole installation and elastomer 1 on, the setup of blind hole has made things convenient for installation quartz chip 2 and strainometer 3, can also eliminate the internal stress of elastomer 1 inside.

Specifically, the bottom of elastomer 1 is provided with the downward outstanding elasticity fixed part 4 of one end for supporting elastomer 1, the top of elastomer 1 is provided with load effect portion 5 for bear the pressure that comes from the vehicle, elastomer 1 is the L shape setting with the combination of elasticity fixed part 4, and referring to fig. 2 and 3, when the vehicle passes through the road surface, exert pressure to elastomer 1 through load effect portion 5, be the cantilever beam structure, take place bending deformation to produce tensile deformation and produce compression deformation in 135 degrees directions in 45 degrees directions.

In use, referring to fig. 2 and 3, after a certain tangential quartz slice 2 is installed, when a vehicle passes through a road surface, pressure is applied to an elastic body 1 through a load acting part 5, the quartz slice 2 deforms synchronously with the elastic body 1, due to the piezoelectric effect of quartz, the Y surface of a quartz crystal is pressed, electric charges appear on the X surface, the electric charges meet the piezoelectric equation of quartz, the electric charges are led to a charge amplifier through a cable to form a measurement signal, the wire grids of the strain gauges 3 also deform synchronously with the elastic body 1, the wire grid in the 45-degree direction is pulled to be lengthened, the resistance value is enlarged, the wire grid in the 135-degree direction is compressed, the resistance value is reduced, the output voltage of a bridge consisting of the strain gauges 3 is changed to form the measurement signal, and the operation of the device is completed through the above.

To sum up, this force transducer, through setting up elastomer 1, quartz section 2 and strainometer 3, when the vehicle passes through the road surface, exert pressure to elastomer 1 through load effect portion 5, quartz section 2 and strainometer 3 along with elastomer 1 synchronous deformation, through quartz section 2 and strainometer 3 cooperation based on the measuring circuit of strain formula principle and based on the measuring circuit of quartz piezoelectricity principle, compare in conventional force transducer, the device has the function of two kinds of signal independent output, measurement accuracy has effectively been guaranteed, the device structure is simplified, the commonality is high, vehicle to high-speed or low-speed state keeps good weighing efficiency.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A force sensor comprises an elastic body (1), a quartz slice (2), a strain gauge (3), a measurement circuit based on a strain type principle and a measurement circuit based on a quartz piezoelectric principle, and is characterized in that: the quartz slice (2) and the strain gauge (3) are sequentially arranged on the elastic body (1); the elastic body (1) is provided with a mounting hole, and the quartz slice (2) and the strain gauge (3) are mounted on the elastic body (1) through the mounting hole.

2. A force sensor according to claim 1, wherein: the elastic body (1) is arranged in a cantilever beam structure, a column structure, a parallel beam structure or a fixed supporting beam structure mode according to the stress condition of a use occasion.

3. A force sensor according to claim 1, wherein: the stressed structure of the elastic body (1) and the piezoelectric effect mode of the quartz slice (2) comprise any one of the following modes: thickness compression, length compression, planar cutting deformation.

4. A force sensor according to claim 1, wherein: a measuring circuit based on a strain type principle and composed of the strain gauge (3) is provided with zero point compensation, zero point temperature compensation, linear compensation, sensitivity temperature compensation and sensitivity compensation.

5. A force sensor according to claim 1, wherein: and a measuring circuit consisting of the quartz slices (2) and based on a piezoelectric effect is provided with a charge amplifier.

6. A force sensor according to claim 1, wherein: and a measuring circuit based on the piezoelectric principle of the quartz slice (2) and a measuring circuit based on the strain type principle of the strain gauge (3) respectively output an electric signal proportional to the load.