CN211904497U

CN211904497U - Sensor circuit and sensor for measuring pressure-torsion composite force

Info

Publication number: CN211904497U
Application number: CN202020870183.3U
Authority: CN
Inventors: 吕华
Original assignee: Changzhou Right Measuring And Controlling System Co ltd
Current assignee: Changzhou Right Measuring And Controlling System Co ltd
Priority date: 2020-05-22
Filing date: 2020-05-22
Publication date: 2020-11-10
Anticipated expiration: 2030-05-22

Abstract

The utility model belongs to the technical field of sensors, in particular to a sensor circuit and a sensor for measuring pressure-torsion composite force, a fixed ring body of the sensor, a stress ring which is coaxial with the fixed ring body, and a connecting ring which is arranged between the fixed ring body and the stress ring; wherein a plurality of torque cross beams are connected between the connecting ring and the stress ring; a plurality of vertical pressing beams are connected between the connecting ring and the fixed ring body; torque strain gauges are adhered to the upper side and the lower side of each torque beam; and the left side and the right side of each vertical pressing beam are bonded with the strain gauges. This measure pressure is turned round sensor of compound power has can measure two dependent variables alone, reduces the influence between two dependent variables, promotes measurement accuracy's effect.

Description

Sensor circuit and sensor for measuring pressure-torsion composite force

Technical Field

The utility model belongs to the technical field of the sensor, concretely relates to sensor circuit and measurement press and turn round sensor of compound power.

Background

The sensor is a detection device which can sense the measured information and convert the sensed information into an electric signal or other information in a required form according to a certain rule to output so as to meet the requirements of information transmission, processing, storage, display, recording, control and the like. The method is the first link for realizing automatic detection and automatic control. The composite sensor itself is an assembly in which 2 or more sensor units for detecting different physical quantities are integrated, which can be understood as a whole. In daily life, sensors with combined torque and pressure are often used.

The prior Chinese patent with publication number CN109141718B discloses a two-dimensional wireless passive tension-torsion composite force sensor, which comprises an elastomer intelligent structure and a sensitive element; the elastic body intelligent structure comprises a loading part, a torsion strain part, a left fixing part, a tensile strain part, a buffer ring and a right fixing part; the sensing elements are made of magnetostrictive soft magnetic strips and comprise a first sensing element, a second sensing element and a third sensing element, the first sensing element is adhered to a torsion strain part of the elastomer intelligent structure, and the second sensing element and the third sensing element are respectively arranged on the two tension strain parts. The two-dimensional wireless passive tension-torsion composite force sensor realizes the decoupling of tension and torsion through the design of an elastomer intelligent structure, and realizes the measurement of the tension and torsion through respective sensitive elements, thereby solving the technical problems.

The above prior art solutions have the following drawbacks: during actual measurement, because pressure and torsion exist simultaneously, the pressure interferes with the torsion detection unit, and the torsion interferes with the pressure detection unit, so that the problems that the interference of signals of tension and pressure and torque is serious, and the measurement accuracy is low exist.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a sensor circuit has two dependent variables that can the independent measurement, reduces the effect that pulling pressure and torque signal interfere.

In order to solve the technical problem, the utility model provides a sensor circuit, including pressing strain gage and moment of torsion strain gage, the pressing strain gage electricity is connected with first wheatstone bridge;

the first Wheatstone bridge is suitable for outputting a corresponding voltage value according to the deformation quantity pressed to the strain gauge;

the torque strain gauge is electrically connected with a second Wheatstone bridge;

the second Wheatstone bridge is suitable for outputting corresponding voltage value according to the deformation quantity of the torque strain gauge.

Furthermore, the first Wheatstone bridge and the second Wheatstone bridge are both provided with zero point compensation circuits; for regulating the temperature drift of the sensor when the output of the sensor is zero, as described above.

Furthermore, the first Wheatstone bridge and the second Wheatstone bridge are both provided with a range temperature coefficient compensation circuit; for compensating the sensor as described above for temperature variations.

Further, the first wheatstone bridge and the second wheatstone bridge are both provided with a TC0 compensation circuit; for compensation of the sensor as described above at zero temperature.

The beneficial effects of the utility model are that, the utility model discloses a first Wheatstone bridge can measure the deformation volume that presses to the foil gage, and the deformation volume of second Wheatstone bridge measurement moment of torsion foil gage is regarded two deformation volumes as data output. The zero point compensation circuit can compensate the output of the sensor when the output is zero. The span temperature coefficient compensation circuit can compensate the sensor along with the temperature change. The TC0 compensation circuit is capable of compensating for the sensor at zero temperature.

In another aspect, the present invention further provides a sensor for measuring a torsional composite force, including:

the fixed ring body and the stress ring are arranged at the center of the fixed ring body; and a connecting ring arranged between the fixed ring body and the stress ring; wherein

A plurality of torque cross beams are connected between the connecting ring and the stress ring;

a plurality of vertical pressing beams are connected between the connecting ring and the fixed ring body;

torque strain gauges are adhered to the upper side and the lower side of each torque beam;

and the left side and the right side of each vertical pressing beam are bonded with the strain gauges.

Furthermore, the side face of the fixing ring body is provided with a connecting face, and a connecting threaded hole is formed in the connecting face.

Furthermore, a plurality of convex parts are arranged in the connecting ring, the convex parts are uniformly distributed around the stress ring, and two ends of the torque beam are respectively connected to the side wall of the stress ring and the inner concave surface of the convex part; and

each pressing vertical beam is arranged between the adjacent convex parts and connected with the inner surface of the fixed ring body.

Further, the sensor employs a sensor circuit as described above.

The beneficial effects of the utility model are that, when the pressure atress in the atress ring, pressure acts on and fixes pressing to on the perpendicular roof beam that the ring body and atress ring are connected to through to the foil gage, measure vertical pressure, and pressure is upper and lower power, makes the moment of torsion foil gage can not act on the pressure crossbeam, and pressure is little to the influence of moment of torsion foil gage. When torsion acts on the stress ring, the torsion acts on the torque beam, the torque beam deforms, the torque strain gauge measures torsion pressure, the vertical beam is pressed to be free from moving up and down when the torsion is received, strain is small, and the influence of the torsion on the pressure strain gauge is small, so that the interference of a sensor on tension pressure and a torque signal is reduced.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a perspective view of the present invention;

FIG. 2 is a circuit diagram of a first Wheatstone bridge according to the present invention;

fig. 3 is a circuit diagram of a second wheatstone bridge of the present invention.

In the figure:

1. a stationary ring body; 101. a stress ring; 102. a connecting surface; 103. connecting the threaded hole; 104. a connecting ring;

2. pressing to the vertical beam; 201. pressing the strain gauge;

3. a torque beam; 301. a torque strain gauge;

4. a first Wheatstone bridge;

5. a second Wheatstone bridge.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are 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.

Example 1

As shown in fig. 1, a sensor for measuring a composite force of pressure and torsion includes: the fixed ring body 2 and the stress ring 101 are coaxially arranged, and the connecting ring 104 is arranged between the fixed ring body 1 and the stress ring 101; a plurality of torque cross beams 3 are connected between the connecting ring 104 and the stress ring 101; a plurality of pressing vertical beams 2 are connected between the connecting ring 104 and the fixed ring body 1; torque strain gauges 301 are bonded to the upper side and the lower side of each torque beam 3; the left and right sides of each of the pressing vertical beams 2 are bonded to the strain gauge 201.

As shown in fig. 1, a connection surface 102 is disposed on a side surface of the fixed ring body 1, and a connection threaded hole 103 is disposed on the connection surface 102. The user fixes the sensor through the connection screw hole 103.

As shown in fig. 1, the connecting ring 104 is provided with a plurality of protrusions 105, each protrusion 105 is uniformly distributed around the force-bearing ring 101, and two ends of the torque beam 3 are respectively connected to the side wall of the force-bearing ring 101 and the inner concave surface of the protrusion 105; and each of the pressing vertical beams 2 is respectively disposed between the adjacent protrusions 105 and connected to the inner surface of the stationary ring body 1.

In summary, when pressure is applied to the force-receiving ring 101, the pressure acts on the vertical beam 2 connected to the fixed ring 1 and the force-receiving ring 101, and the vertical pressure is measured by the strain gauge. When a torsion force acts on the stress ring 101, the torsion force acts on the torque beam 3, the torque beam 3 deforms, and the torsion strain gauge 301 measures a torsion pressure. Pressure is up-down force, so that the torque strain gauge 301 cannot act on a pressure cross beam, the influence of the pressure on the torque strain gauge 301 is small, the pressure vertical beam 2 cannot move up and down when receiving torque, so that the strain amount is small, the influence of the torque force on the pressure strain gauge is small, and the interference of a sensor on tension pressure and torque signals is reduced

As shown in fig. 2 and 3, for the sensor according to the embodiment, a sensor circuit for measuring the composite force of pressure and torsion is further provided, and a first wheatstone bridge 4 is electrically connected to a pressure strain gauge 201 (see fig. 1); the first wheatstone bridge 4 is adapted to output a corresponding voltage value according to the deformation amount pressed to the strain gauge 201; the torque strain gauge 301 (see fig. 1) is electrically connected with a second wheatstone bridge 5; the second wheatstone bridge 5 is adapted to output a corresponding voltage value according to the amount of deformation of the torque strain gauge 301.

As shown in fig. 2 and 3, when the temperature changes, four parameters of the wheatstone bridge in the sensor are changed: zero output voltage, output amplitude, sensitivity and bridge arm resistance. Zero compensation circuits (abbreviated as Zero in the circuit) are provided in both the first wheatstone bridge 4 and the second wheatstone bridge 5. When the input signal of the amplifying circuit is zero, the voltage of the output end of the sensor circuit can be kept stable through the zero point compensation circuit due to the influence of factors such as temperature change, unstable power supply voltage and the like.

As shown in fig. 2 and fig. 3, in order to reduce the influence of the sensitivity on the sensor, span temperature coefficient compensation circuits (abbreviated as TCSpan in the circuit) are arranged on the first heuston bridge 4 and the second wheatstone bridge 5; for compensating the sensor as described above for temperature variations. Meanwhile, the first heuston bridge 4 and the second heuston bridge 5 are both provided with a TC0 compensation circuit (abbreviated as TC0 in the circuit); for compensation of the sensor as described above at zero temperature.

To sum up, the utility model discloses a first wheatstone bridge 4 can measure the deformation volume that presses to foil gage 201, and the deformation volume of second wheatstone bridge 5 measurement moment of torsion foil gage 301 is regarded as two deformation volumes as data output. The zero point compensation circuit can compensate the output of the sensor when the output is zero. The span temperature coefficient compensation circuit can compensate the sensor along with the temperature change. The TC0 compensation circuit is capable of compensating for the sensor at zero temperature.

All the components selected in the application are general standard components or components known by those skilled in the art, and the structure and the principle of the components can be known by technical manuals or by routine experiments.

In the description of the embodiments of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A sensor circuit comprising a pressure strain gauge (201) and a torque strain gauge (301),

the pressure strain gauge (201) is electrically connected with a first Wheatstone bridge (4);

the first Wheatstone bridge (4) is suitable for outputting a corresponding voltage value according to the deformation quantity pressed to the strain gauge (201);

the torque strain gauge (301) is electrically connected with a second Wheatstone bridge (5);

the second Wheatstone bridge (5) is suitable for outputting corresponding voltage value according to the deformation quantity of the torque strain gauge (301).

2. A sensor circuit as claimed in claim 1,

zero point compensation circuits are arranged on the first Wheatstone bridge (4) and the second Wheatstone bridge (5);

and the temperature drift adjusting device is used for adjusting the temperature drift amount of the sensor when the output of the sensor is zero.

3. A sensor circuit as claimed in claim 2,

and the first Wheatstone bridge (4) and the second Wheatstone bridge (5) are respectively provided with a measuring range temperature coefficient compensation circuit.

4. A sensor circuit as claimed in claim 3,

and the first Wheatstone bridge (4) and the second Wheatstone bridge (5) are provided with TC0 compensation circuits.

5. A sensor for measuring a combination of pressure and torque, comprising:

the device comprises a fixed ring body (1), a stress ring (101) which is coaxial with the fixed ring body (1), and a connecting ring (104) which is arranged between the fixed ring body (1) and the stress ring (101); wherein

A plurality of torque cross beams (3) are connected between the connecting ring (104) and the stress ring (101);

a plurality of pressing vertical beams (2) are connected between the connecting ring (104) and the fixed ring body (1);

torque strain gauges (301) are bonded to the upper side and the lower side of each torque beam (3);

and the left side and the right side of each vertical pressing beam (2) are bonded and pressed to the strain gauge (201).

6. The sensor for measuring composite force of pressure and torsion according to claim 5,

the side of the fixed ring body (1) is provided with a connecting surface (102), and the connecting surface (102) is provided with a connecting threaded hole (103).

7. The sensor for measuring composite force of pressure and torsion according to claim 6,

the connecting ring (104) is internally provided with a plurality of protrusions (105), the protrusions (105) are uniformly distributed around the stress ring (101), and two ends of the torque beam (3) are respectively connected to the side wall of the stress ring (101) and the inner concave surface of the protrusions (105); and

each pressing vertical beam (2) is arranged between the adjacent convex parts (105) and connected with the inner surface of the fixed ring body (1).

8. The sensor for measuring composite force of pressure and torsion according to claim 7,

the sensor employs a sensor circuit as claimed in any one of claims 1-4.