CN103728057A

CN103728057A - Ultrahigh-accuracy force sensor

Info

Publication number: CN103728057A
Application number: CN201410009479.5A
Authority: CN
Inventors: 王秋晓; 沈利坚
Original assignee: Chongqing University
Current assignee: Chongqing University
Priority date: 2014-01-09
Filing date: 2014-01-09
Publication date: 2014-04-16

Abstract

The invention relates to an ultrahigh-accuracy force sensor and belongs to the field of mechanics measurement. The ultrahigh-accuracy force sensor consists of a lever, an armature, an electromagnet, an electromagnet support, a supporting column, a rotating mechanism, a lever balancing and detecting device, a base plate, a closed-loop control system and the like. The armature is connected onto the lever through a screw, and the lever is installed on the rotating mechanism. The electromagnet is arranged under the armature and installed on the electromagnet support. The supporting column is fixed at the rear end of the lever and can move with the lever, and the lever balancing and detecting device is arranged under the supporting column. When pressure acts on the sensor, the lever rotates, passes the lever balancing and detecting device and then passes the closed-loop control system to enable the electromagnet to produce electromagnetic force, and the armature is attracted to enable the lever to return to the initial position. Due to the fact that a mechanical structure of the sensor is not changed after the lever returns to the initial position and an output of the sensor adopts a mode that electrical parameters are controlled by electromagnets, control voltage can reach to dozens of volts, and the sensor can have ultrahigh accuracy.

Description

Superhigh precision power sensor

Technical field

The present invention relates to a kind of superhigh precision power sensor, belong to mechanics metering field.

Technical background

As everyone knows, conventional force sensors has the types such as resistance strain gage, semiconductor gauge, pressure resistance type, piezoelectric type, and its ultimate principle is by elastic sensing element stress deformation, by pressing the effects such as change, pressure drag, piezoelectricity, deflection is converted into electric signal, reflects the size of the power meeting.There is limitation in this measuring principle, and in elastic sensing element and architectural characteristic, the linearity is difficult to surpass ten thousand/.Because power sensor is in linearity limitation in this respect, although power sensor in a lot of method development rapidly for a long time, technology reaches its maturity, but aspect the basic technical indicators such as the linearity, precision secular stagnation not before, can not break through 100,000/several linearity, the power sensor of superhigh precision fails to obtain substantial progress always, has affected the development of the technology such as quality center of mass measurement.

Traditional power sensor that the strain-ga(u)ge technique of take is at present basis, its linearity is lower than 0.3%, and measuring accuracy is difficult surpasses 0.03%, and power sensor is the core component of mass of object barycenter measuring equipment, and the precision of sensor determines measurement accuracy.

Summary of the invention

In order to overcome, take the linearity of traditional power sensor that strain gauge technique is basis lower than 0.3%, difficult 0.03% the deficiency that surpasses of measuring accuracy, the invention provides and a kind ofly can improve the linearity, carry high-precision superhigh precision power sensor.

In order to achieve the above object, design of the present invention is:

Manage to adopt a balancing force to offset power suffered on superhigh precision pressure transducer, and this balancing force can produce by electromagnet, as everyone knows, electromagnetic force on electromagnet, the size that can flow through its electric current by change is controlled, electric current can pass through Control of Voltage again, in the time of on acting on effectively superhigh precision pressure transducer, use a pick-up unit, detect the displacement deformation of sensor, by a closed-loop control system, control and flow through the electric current on electromagnet, make electromagnetic force just equal to act on the power on sensor, sensor is returned to before distortion, therefore as long as can guarantee to control the linearity of voltage, just can guarantee the linearity of superhigh precision sensor, be equivalent to the linearity to transfer on control voltage.

In order to reach foregoing invention design, technical scheme of the present invention is:

A superhigh precision power sensor, comprises the ingredients such as lever, electromagnet, electromagnet bearing, armature, support column, rotating mechanism, lever balance pick-up unit, closed-loop control system, base plate.Armature is connected on lever, and lever is placed on rotating mechanism, and rotating mechanism is fixed on base plate, and during lever level, under armature, correspondence is being placed electromagnet, and electromagnet is fixed on electromagnet bearing, and electromagnet bearing is fixed on base plate.In order to detect lever, whether return to initial position, the present invention has adopted a lever balance pick-up unit, has adopted a pressure transducer, also can adopt other sensor, and this lever balance pick-up unit is placed on lever and is subject to pressure side below.

Good effect of the present invention is:

1, solved the contradiction between traditional sensors range and the linearity.After restoring force effect, superhigh precision sensor mechanical structure is just the same before geometric aspects and loading, non-linear elimination completely mechanically, sensor self is completely linear, and relative strain survey sensor, it depends on the distortion of elastic sensing element, and it is innately nonlinear.2, the antijamming capability of sensor is stronger.The output of this sensor occurs with the form of magnet control electrical quantity, control voltage and can, up to tens of volts, by controlling the relation of the electromagnetic force of voltage and generation, obtain the size of ergometry, owing to controlling the noise of voltage far above electron device, can obtain very high sensor accuracy.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of superhigh precision power sensor;

Fig. 2 is support column schematic diagram;

Fig. 3 is lever balance pick-up unit schematic diagram;

Fig. 4 is the schematic diagram that lever coordinates with rotating mechanism;

Fig. 5 is electromagnet schematic diagram;

Embodiment

Below by specific embodiment, the invention will be further elaborated, is not limited only to the present embodiment, by simple transformation or equivalent application, also belongs to protection scope of the present invention.

A superhigh precision power sensor, mainly comprises lever 1, armature 2, electromagnet 3, electromagnet stent 4, support column 5, rotating mechanism 6, lever balance pick-up unit 7, base plate 8, closed-loop control system etc.As shown in Figure 1, armature 2 is connected by screw at lever 1 front end, corresponding electromagnet 3 under it; Electromagnet 3 is arranged on electromagnet stent 4, and electromagnet stent 4 is screwed on base plate 8; Whole lever 1, by rotating mechanism 6, is screwed on base plate 8 equally; Support column 5 is arranged on lever 1 end, and its below is lever balance pick-up unit 7.Fig. 2 is the schematic diagram of support column 5, is used for transmission of pressure.The work schematic diagram of Fig. 3 lever balance pick-up unit 7, what in this example, adopt is to detect with pressure transducer whether lever rotates and whether return to original equilibrium position, because support column 5 is fixed together with lever 1 by nut 9, so when support column 5 upper ends are under pressure, lever 1 end can sink, and when lever 1 end returns to origin-location, support column 5 equally also can be followed and return to together origin-location; Support column 5 lower ends, by steel ball 10, are transferring the pressure on the pressure transducer in lever balance pick-up unit 7 by sensor pressure head 11.What Fig. 4 illustrated is how lever 1 and rotating mechanism 6 coordinate, and rotating mechanism 6 is mainly comprised of shaft seating gland 13, rolling bearing 14, rotating shaft 15 and shaft seating 16, therefore lever 1 can rotate around rotating shaft 15.During concrete enforcement, when support column 5 is under pressure, lever 1 end can sink around rotating shaft 15, now, same big or small power also can act on the pressure transducer in lever balance pick-up unit 7, measures the size of this pressure according to this pressure transducer, pass through closed-loop control system, according to the pressure size of gained, change the electric current flowing through by electromagnet 3, the electromagnetic force that makes to produce can just make lever 1 can return to stressed before; Then by closed-loop control system, will flow through the electric current of electromagnet, be converted into the parameter of pressure, just can obtain having acted on the pressure on support column 5.

Claims

1. a novel superhigh precision power sensor, mainly by lever 1, armature 2, electromagnet 3, electromagnet bearing 4, support column 5, rotating mechanism 6, lever balance pick-up unit 7, base plate 8, the compositions such as closed-loop control system, it is characterized in that: lever 1 fixes 6 on base plate 8 by rotating mechanism, and can be around rotating mechanism 6 rotations, lever 1 front end is connecting armature 2, by electromagnet 3 absorption armature 2, can make lever 1 rotate around rotating mechanism 6, support column 5 coordinates with lever 1 end, be used for bearing pressure, by lever balance device 7, can detect lever 1 and whether return to initial position, thereby by closed-loop system, control the size of the electromagnetic force of electromagnet 3, make lever 1 return to initial position.

2. superhigh precision power sensor as claimed in claim 1, is characterized in that: described lever 1 can according to the actual requirements, be adjusted size.

3. superhigh precision power sensor as claimed in claim 1, is characterized in that: described rotating lever balance detecting device 7, can detect any sensor whether lever return to initial position by pressure transducer, displacement transducer or other and form.

4. superhigh precision power sensor as claimed in claim 1, is characterized in that: the Component Mechanisms such as described electromagnet bearing 4, support column 5, rotating mechanism 6 can, according to actual installation height needs, be adjusted height.

5. superhigh precision power sensor as claimed in claim 1, is characterized in that: described base plate 8, can adjust as required shape.

6. superhigh precision power sensor as claimed in claim 1, is characterized in that: described electromagnet 3 can be any other shape electromagnet.