CN112014010A - Novel strain type pressure two-dimensional force sensor - Google Patents

Abstract

The invention relates to the technical field of sensors, and discloses a novel strain type pressure two-dimensional force sensor which comprises an elastic element, wherein the elastic element is of a T-shaped beam structure and comprises a longitudinal beam extending longitudinally and a transverse beam extending horizontally, a first through groove extending transversely is formed in the side surface of the longitudinal beam, and a second through groove extending longitudinally is formed in the side surface of the transverse beam; the resistive strain gauge R1, the resistive strain gauge R2, the resistive strain gauge R3, and the resistive strain gauge R4 are bonded to the side member, and the resistive strain gauge R1, the resistive strain gauge R2, the resistive strain gauge R3, and the resistive strain gauge R4 form a lateral pressure measurement wheatstone bridge. According to the novel strain type pressure two-dimensional force sensor, the structural design of a T-shaped beam is adopted, the eccentric load resistance and the lateral load resistance are high, and the dynamic and static application performances can be improved; meanwhile, the structure is simple and compact, the installation and the disassembly are convenient, and the installation space is saved.

Description

A new strain-type pressure two-dimensional force sensor

technical field

The invention relates to the technical field of sensors, in particular to a novel strain-type pressure two-dimensional force sensor.

Background technique

With the rapid development of the trend of industrial automation, more and more products nowadays rely on different pressure sensations on product components to improve the user's experience of using products, such as pressure-sensitive pens, game mouse wheels, and so on. However, these products often have some problems in the assembly process. For example, when using the game mouse wheel, it is necessary to detect the force in two directions on the wheel, that is, the vertical pressure of the wheel and the horizontal rolling pressure, so as to ensure that the user uses the mouse when using the mouse. , can have a good feel. Therefore, it is necessary to provide a sensor that can precisely control the pressure output in two directions to solve the above problems, so as to improve production efficiency, product quality, and further improve product user experience.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a novel strain-type pressure two-dimensional force sensor, which aims to solve the problem of lack of a sensor that can measure pressure from two different directions in real time in the prior art.

The present invention is achieved by providing a novel strain-type pressure two-dimensional force sensor, which includes an elastic element, the elastic element is a "T"-shaped beam structure, and the elastic element includes a longitudinally extending longitudinal beam and a horizontally extending transverse beam , the side of the longitudinal beam has a first through groove extending laterally, and the side of the transverse beam has a second through groove extending longitudinally; the longitudinal beam is pasted with a resistance strain gauge R1, a resistance strain gauge R2, a resistor Strain gauge R3 and resistance strain gauge R4, the resistance strain gauge R1, resistance strain gauge R2, resistance strain gauge R3 and resistance strain gauge R4 constitute a transverse pressure measurement Wheatstone bridge; resistance strain gauge R5 is pasted on the beam , resistance strain gauge R6, resistance strain gauge R7 and resistance strain gauge R8, the resistance strain gauge R5, resistance strain gauge R6, resistance strain gauge R7 and resistance strain gauge R8 constitute a longitudinal pressure measurement Wheatstone bridge.

Further, the top of the longitudinal beam is fixedly connected with the middle of the transverse beam to form the "T" beam structure.

Further, the first end of the resistance strain gauge R1 is coupled to the positive electrode of the power supply, the first end of the resistance strain gauge R4 is coupled to the second end of the resistance strain gauge R1, and the resistance strain gauge R4 The second end is coupled to the negative pole of the power supply, the first end of the resistance strain gauge R2 is coupled to the first end of the resistance strain gauge R1, and the first end of the resistance strain gauge R3 is coupled to the resistance strain gauge R2 The second end of the resistance strain gauge R3 is coupled to the negative electrode of the power supply.

Further, the first end of the resistance strain gauge R5 is coupled to the positive electrode of the power supply, the first end of the resistance strain gauge R8 is coupled to the second end of the resistance strain gauge R5, and the resistance strain gauge R8 The second end is coupled to the negative pole of the power supply, the first end of the resistance strain gauge R6 is coupled to the first end of the resistance strain gauge R5, and the first end of the resistance strain gauge R7 is coupled to the resistance strain gauge R6 The second end of the resistance strain gauge R7 is coupled to the negative electrode of the power supply.

Further, the outer periphery of the elastic element is sleeved with a casing for protecting the elastic element, and there is a gap between the casing and the elastic element.

Further, a plurality of first threaded holes are provided on the side surface of the elastic element, and the first threaded holes are matched and fixed with the casing by screws, and the screws are sleeved with "O"-shaped washers, and the The "O"-shaped gasket is used to separate the housing from the elastic element and is located between the housing and the elastic element.

Further, the "O"-shaped gasket is made of rubber material.

Further, a plurality of the first threaded holes are provided on the side surface of the beam, and/or the plurality of the first threaded holes are arranged symmetrically with respect to the central axis of the elastic element.

Further, the second through groove is symmetrical with respect to the central axis of the elastic element.

Further, the upper surface of the beam is provided with a plurality of second threaded holes for installing and fixing the sensor to a designated position.

Compared with the prior art, the present invention mainly has the following beneficial effects:

A new strain-type pressure two-dimensional force sensor provided above, because the pressure measurement adopts the structural design of "T" beam, it has strong resistance to eccentric load and lateral load, and can improve the dynamic and static application performance. At the same time, the structure is simple and compact, easy to install and disassemble, save installation space, and can meet the real-time measurement and control of force values in different directions for products such as pressure-sensitive pens and game mouse wheels, thereby improving production efficiency, reducing product defect rates, and optimizing users. experience.

Description of drawings

1 is a schematic structural diagram of a novel strain-type pressure two-dimensional force sensor provided by an embodiment of the present invention;

FIG. 2 is a schematic structural exploded view of a novel strain-type pressure two-dimensional force sensor provided by an embodiment of the present invention;

FIG. 3 is a circuit diagram of a Wheatstone bridge for pressure measurement provided by an embodiment of the present invention.

Reference numerals: 1- elastic element, 2- housing, 3- screw, 4- "O" washer, 5- wire, 11- stringer, 12- beam, 13- first threaded hole, 14- second thread Holes, 111-first through-slot, 121-second through-slot.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

The same or similar numbers in the drawings of this embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. structure and operation, so the terms describing the positional relationship in the accompanying drawings are only used for exemplary illustration, and should not be construed as a limitation on this patent, and those of ordinary skill in the art can understand the specific meanings of the above terms according to specific situations.

The implementation of the present invention will be described in detail below with reference to specific embodiments.

Please refer to FIG. 1. FIG. 1 shows a schematic structural diagram of a novel strain-type pressure two-dimensional force sensor provided by the present invention. Referring to FIG. 2 at the same time, a novel strain-type pressure two-dimensional force sensor provided in this embodiment includes: Elastic element 1, the elastic element 1 is a "T" beam structure, the elastic element 1 includes a longitudinally extending longitudinal beam 11 and a horizontally extending beam 12, the longitudinal beam 11 has a laterally extending first through groove 111 on the side, and the transverse beam 12 There is a second through slot 121 extending longitudinally on the side of the longitudinal beam 11; resistance strain gauge R1, resistance strain gauge R2, resistance strain gauge R3 and resistance strain gauge R4 are pasted on the longitudinal beam 11, resistance strain gauge R1, resistance strain gauge R2, resistance strain gauge R2, resistance strain gauge R1, resistance strain gauge R2, resistance strain gauge R2 The strain gauge R3 and the resistance strain gauge R4 constitute a Wheatstone bridge for transverse pressure measurement; on the beam 12 are pasted the resistance strain gauge R5, the resistance strain gauge R6, the resistance strain gauge R7 and the resistance strain gauge R8, the resistance strain gauge R5, the resistance strain gauge Gauge R6, resistance strain gauge R7, and resistance strain gauge R8 constitute a longitudinal pressure measurement Wheatstone bridge.

In the above-mentioned novel strain-type pressure two-dimensional force sensor, the resistance strain gauge R1, resistance strain gauge R2, resistance strain gauge R3, and resistance strain gauge R4 are attached to the longitudinal beam 11. When the elastic element 1 is subjected to lateral pressure, the longitudinal The beam 11 will deform in the lateral direction, which makes the resistance of the resistance strain gauge on the longitudinal beam 11 change, and then the measurement of the pressure value is completed through the transverse pressure measurement Wheatstone bridge; resistance strain gauge R5, resistance strain gauge R6, The resistance strain gauge R7 and the resistance strain gauge R8 are attached to the beam 12. When the elastic element 1 is subjected to longitudinal pressure, the beam 12 will deform in the longitudinal direction, which makes the resistance of the resistance strain gauge on the beam 12 change. Longitudinal pressure measurement Wheatstone bridge completes the measurement of pressure value, so as to realize real-time measurement of longitudinal pressure and lateral pressure; the elastic element 1 adopts the structural design of "T" beam, which has a simple and compact structure, and is easy to install and disassemble; High precision and good reliability.

The novel strain-type pressure two-dimensional force sensor provided by the present invention has strong resistance to eccentric load and lateral load, and can improve dynamic and static application performance because the pressure measurement adopts the structural design of "T" beam. At the same time, the structure is simple and compact, easy to install and disassemble, save installation space, and can meet the real-time measurement and control of force values in different directions for products such as pressure-sensitive pens and game mouse wheels, thereby improving production efficiency, reducing product defect rates, and optimizing users. experience.

Preferably, the resistance strain gauge R1 , the resistance strain gauge R2 , the resistance strain gauge R3 , and the resistance strain gauge R4 are attached to the side surface of the longitudinal beam 11 .

Preferably, the resistance strain gauge R5 , the resistance strain gauge R6 , the resistance strain gauge R7 , and the resistance strain gauge R8 are attached to the lower surface of the beam 12 .

As an embodiment of the present invention, referring to FIG. 2 , the top of the longitudinal beam 11 is fixedly connected with the middle of the transverse beam 12 to form a "T"-shaped beam structure. This allows the longitudinal beams 11 to carry less weight, and the overall structure is more stable and bearing capacity.

Referring to FIG. 3, the first end of the resistance strain gauge R1 is coupled to the positive electrode of the power supply, the first end of the resistance strain gauge R4 is coupled to the second end of the resistance strain gauge R1, and the second end of the resistance strain gauge R4 is coupled to the power supply Negative, the first end of the resistance strain gauge R2 is coupled to the first end of the resistance strain gauge R1, the first end of the resistance strain gauge R3 is coupled to the second end of the resistance strain gauge R2, and the second end of the resistance strain gauge R3 coupled to the negative pole of the power supply. When the longitudinal beam 11 is subjected to lateral pressure, the resistance of the resistance strain gauge R1 and the resistance strain gauge R3 increases, and the resistance of the resistance strain gauge R2 and the resistance strain gauge R4 decreases. If the power supply of the bridge is U at this time, the output voltage U0, thus Convert the lateral pressure into a measurable voltage signal to measure the lateral pressure value.

Similarly, the first end of the resistance strain gauge R5 is coupled to the positive pole of the power supply, the first end of the resistance strain gauge R8 is coupled to the second end of the resistance strain gauge R5, and the second end of the resistance strain gauge R8 is coupled to the negative pole of the power supply , the first end of the resistance strain gauge R6 is coupled to the first end of the resistance strain gauge R5, the first end of the resistance strain gauge R7 is coupled to the second end of the resistance strain gauge R6, and the second end of the resistance strain gauge R7 is coupled to Connect to the negative pole of the power supply. When the beam 12 is subjected to longitudinal pressure, the resistances of R6 and R7 increase, and the resistances of R5 and R8 decrease. If the power supply of the bridge is U3 at this time, the output voltage U4 will convert the pressure into a measurable voltage signal to realize the pressure value. Measurement.

Specifically, the transverse pressure measurement Wheatstone bridge and the longitudinal pressure measurement Wheatstone bridge are connected to external circuits through wires 5 .

As an embodiment of the present invention, referring to FIG. 1 and FIG. 2 at the same time, the outer periphery of the elastic element 1 is sleeved with a casing 2 for protecting the elastic element 1 , and there is a gap between the casing 2 and the elastic element 1 . There needs to be a gap between the casing 2 and the elastic element 1, so that when the elastic element 1 is deformed, the degree of deformation of the elastic element 1 will not be affected by the blocking of the casing 2, thereby causing errors in pressure value detection.

Specifically, a plurality of first threaded holes 13 are provided on the side surface of the elastic element 1, and the first threaded holes 13 are fixed with the housing 2 by means of screws 3. The screws 3 are sleeved with "O"-shaped washers 4, and the "O" type washers 4 are set on the screws 3. ”-shaped gasket 4 is used to separate the housing 2 from the elastic element 1 and is located between the housing 2 and the elastic element 1 . By using the screws 3 to cooperate with the first threaded holes 13 for fixing, it is convenient to install and fix the housing 2 .

Wherein, the plurality of first threaded holes 13 are provided on the side surface of the beam 12 , and/or the plurality of first threaded holes 13 are arranged symmetrically with respect to the central axis of the elastic element 1 . In this way, the housing 2 can be fixed more stably, and the influence of the housing 2 on the deformation process of the elastic element 1 is minimized.

Preferably, the "O"-shaped gasket 4 is made of rubber. The "O"-shaped gasket 4 made of rubber has elasticity, which can minimize the influence on the deformation of the elastic element 1 .

Specifically, the second through groove 121 is symmetrical with respect to the central axis of the elastic element 1 ; such an arrangement can ensure smooth transmission of pressure.

As an embodiment of the present invention, the upper surface of the beam 12 is provided with a plurality of second threaded holes 14 for installing and fixing the sensor to a designated position. In this way, during the deformation process of the elastic element 1 , the upper surface of the beam 12 is connected with the designated position by bolts, which can minimize the influence on the elastic element 1 .

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (10)

1. A novel strain type pressure two-dimensional force sensor is characterized by comprising an elastic element, wherein the elastic element is of a T-shaped beam structure and comprises a longitudinal beam extending longitudinally and a horizontal beam extending horizontally, a first through groove extending transversely is formed in the side surface of the longitudinal beam, and a second through groove extending longitudinally is formed in the side surface of the horizontal beam; a resistance strain gauge R1, a resistance strain gauge R2, a resistance strain gauge R3 and a resistance strain gauge R4 are adhered to the longitudinal beam, and a transverse pressure measurement Wheatstone bridge is formed by the resistance strain gauge R1, the resistance strain gauge R2, the resistance strain gauge R3 and the resistance strain gauge R4; the beam is bonded with a resistance strain gauge R5, a resistance strain gauge R6, a resistance strain gauge R7 and a resistance strain gauge R8, and the resistance strain gauge R5, the resistance strain gauge R6, the resistance strain gauge R7 and the resistance strain gauge R8 form a longitudinal pressure measurement wheatstone bridge.

2. The novel strain type pressure two-dimensional force sensor as claimed in claim 1, wherein the top of the longitudinal beam is fixedly connected with the middle of the transverse beam to form the T-shaped beam structure.

3. The novel strain-type pressure two-dimensional force sensor as claimed in claim 1, wherein a first end of the R1 is coupled to a positive power supply, a first end of the R4 is coupled to a second end of the R1, a second end of the R4 is coupled to a negative power supply, a first end of the R2 is coupled to a first end of the R1, a first end of the R3 is coupled to a second end of the R2, and a second end of the R3 is coupled to a negative power supply.

4. The novel strain-type pressure two-dimensional force sensor as claimed in claim 1, wherein a first end of the R5 is coupled to a positive power supply, a first end of the R8 is coupled to a second end of the R5, a second end of the R8 is coupled to a negative power supply, a first end of the R6 is coupled to a first end of the R5, a first end of the R7 is coupled to a second end of the R6, and a second end of the R7 is coupled to a negative power supply.

5. The novel strain type pressure two-dimensional force sensor as claimed in any one of claims 1-4, wherein the elastic element is sleeved with a shell for protecting the elastic element, and a gap is formed between the shell and the elastic element.

6. The novel strain type pressure two-dimensional force sensor as claimed in claim 5, wherein a plurality of first threaded holes are provided on the side surface of the elastic element, the first threaded holes are fixed with the housing by screws in a matching manner, an "O" type gasket is sleeved on the screws, and the "O" type gasket is used for separating the housing from the elastic element and is located between the housing and the elastic element.

7. The novel strain gauge pressure two-dimensional force sensor according to claim 6, wherein the O-shaped gasket is made of rubber.

8. The novel strain gauge pressure two-dimensional force sensor according to claim 6, wherein a plurality of the first threaded holes are provided on a side surface of the cross beam, and/or a plurality of the first threaded holes are symmetrically arranged about a central axis of the elastic element.

9. The novel strain gauge pressure two-dimensional force sensor according to any of claims 1-4, wherein the second through groove is symmetrical about the central axis of the elastic element.

10. The novel strain gauge pressure two-dimensional force sensor as claimed in any one of claims 1-4, wherein the beam upper surface is provided with a plurality of second threaded holes for mounting and fixing the sensor to a specified position.

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