CN111780900A - Strain force transducer - Google Patents
Strain force transducer Download PDFInfo
- Publication number
- CN111780900A CN111780900A CN202010530054.4A CN202010530054A CN111780900A CN 111780900 A CN111780900 A CN 111780900A CN 202010530054 A CN202010530054 A CN 202010530054A CN 111780900 A CN111780900 A CN 111780900A
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- Prior art keywords
- strain gauge
- main beam
- strain
- elastic main
- resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/225—Measuring circuits therefor
- G01L1/2262—Measuring circuits therefor involving simple electrical bridges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2206—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2287—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges constructional details of the strain gauges
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Force In General (AREA)
Abstract
The invention discloses a strain force transducer. The problems of low precision and instability of signal output errors caused by expansion with heat and contraction with cold of equipment due to temperature cannot be solved in the prior art; the device comprises a first elastic main beam and a second elastic main beam which are vertically arranged, wherein the first elastic main beam is arranged along the stress direction of the equipment to be tested; the first elastic main beam and the second elastic main beam are respectively provided with a first strain gauge and a second strain gauge, and output ends of the first strain gauge and the second strain gauge are connected in parallel in an anti-phase mode. The scheme indirectly measures the stress of the tested equipment without changing the structure of the original tested equipment, and has simple and safe installation and convenient use; the structure is simple, and the cost is low; the scene adaptability is strong. The strain gauges which are perpendicular to each other are connected in parallel in an anti-phase mode, so that the temperature-sensitive thermal expansion and cold contraction compensation device has a thermal expansion and cold contraction compensation function during temperature change, and is strong in scene adaptability and temperature stability.
Description
Technical Field
The invention relates to the field of sensors, in particular to a strain force sensor.
Background
At present, more and more industrial occasions need implement the transformation of weighing to engineering equipment in order to realize monitoring and automatic control, but the tradition transformation scheme all need destroy original atress structure and remove to install direct weighing sensor additional, and is with high costs like this, and the transformation volume is big, can destroy former equipment design intensity moreover, so need a appearance small and exquisite, the installation is simple, transforms safe, indirect survey strain sensor. The existing indirect strain measurement sensor in the market only considers the signal output caused by the stress deformation of the equipment structure, fails to solve the problem of signal output errors caused by expansion caused by heat and contraction caused by cold of the equipment due to temperature, has low precision and instability, and can only be used in indoor constant-temperature environment.
For example, an "attached force sensor" disclosed in chinese patent literature, whose publication number CN101603865B includes an elastic body main beam, where two ends of the elastic body main beam are provided with left and right mounting ends, the middle of the elastic body main beam is provided with a structural hole, the middle of the structural hole is provided with a strain beam, and the elastic body main beam, the left and right mounting ends, the strain beam are all of axially symmetric rectangular structures, and the middle of the left and right mounting ends is respectively provided with a first mounting hole and a second mounting hole; the structural hole, the strain beam, the first mounting hole and the second mounting hole are positioned on the same axis; resistance strain gauges are respectively stuck on the upper surface and the lower surface of the strain beam. The scheme only considers the signal output caused by the stress deformation of the equipment structure, fails to solve the problem of signal output errors caused by expansion with heat and contraction with cold of the equipment caused by temperature, has very low precision and instability, and can only be used in indoor constant-temperature environments.
Disclosure of Invention
The invention mainly solves the problems of low precision and instability of signal output errors caused by expansion with heat and contraction with cold of equipment caused by temperature in the prior art; the strain force transducer has the functions of expansion with heat and contraction with cold self-compensation, can indirectly measure strain on the basis of not damaging original equipment, can overcome the influence of poor stability caused by temperature, and has the advantages of simple installation and strong occasion adaptability.
The technical problem of the invention is mainly solved by the following technical scheme:
a strain force transducer is used for testing the strain of a tested device; the device comprises a first elastic main beam and a second elastic main beam which are arranged vertically to each other, wherein the first elastic main beam is arranged along the stress direction of the tested device; the first elastic main beam and the second elastic main beam are respectively provided with a first strain gauge and a second strain gauge, and output ends of the first strain gauge and the second strain gauge are connected in parallel in an anti-phase mode.
When the tested equipment is stressed and deformed, the first strain gauge on the first elastic main beam detects stress, and the second strain gauge cannot detect the stress because the second elastic main beam is perpendicular to the stress direction of the tested equipment; the stress of the tested device is indirectly detected through the first elastic main beam and the first strain gauge, the structure of the original tested device does not need to be changed, and the device is convenient and safe to install and low in cost. When the temperature changes, the outputs of the first strain gauge and the second strain gauge are simultaneously subjected to interference changes caused by thermal expansion and cold contraction of equipment, the change trends are consistent, and the outputs of the first strain gauge and the second strain gauge are connected in parallel in an anti-phase mode, so that the output of the second strain gauge can counteract the interference changes on the output of the first strain gauge. The influence of the temperature on the measurement of the stress is avoided, so that the sensor is suitable for indoor environment and outdoor environment, and the scene adaptability is strong.
Preferably, the first strain gauge and the second strain gauge are full-bridge strain gauges; the positive input end of the first strain gauge is connected with the positive input end of the second strain gauge, and the negative input end of the first strain gauge is connected with the negative input end of the second strain gauge; the positive output end of the first strain gauge is connected with the negative output end of the second strain gauge to form the positive output end of the strain force measuring sensor, and the negative output end of the first strain gauge is connected with the positive input end of the second strain gauge to form the negative output end of the strain force measuring sensor. When the temperature changes, the outputs of the first strain gauge and the second strain gauge are simultaneously subjected to interference changes caused by thermal expansion and cold contraction of equipment, the change trends are consistent, and the outputs of the first strain gauge and the second strain gauge are connected in parallel in an anti-phase mode, so that the output of the second strain gauge can counteract the interference changes on the output of the first strain gauge. The influence of the temperature on the measurement of the stress is avoided, so that the sensor is suitable for indoor environment and outdoor environment, and the scene adaptability is strong.
Preferably, the full-bridge strain gauge comprises a first resistance strain gauge, a second resistance strain gauge, a fourth resistance strain gauge and a third resistance strain gauge which are connected in sequence, and the third resistance strain gauge is connected with the first resistance strain gauge; the connecting point of the first resistance strain gauge and the third resistance strain gauge is the positive input end of the full-bridge strain gauge, the connecting point of the second resistance strain gauge and the fourth resistance strain gauge is the negative input end of the full-bridge strain gauge, the connecting point of the first resistance strain gauge and the second resistance strain gauge is the positive output end of the full-bridge strain gauge, and the connecting point of the third resistance strain gauge and the fourth resistance strain gauge is the negative output end. And the full-bridge strain gauge is adopted, so that the output is more stable and accurate.
Preferably, the two ends of the first elastic main beam and the second elastic main beam are respectively provided with a mounting seat, and the first elastic main beam and the second elastic main beam are fixedly connected with the tested equipment through the mounting seats. Make sensor and equipment under test fixed through the mount pad, when equipment atress warp, the stress is experienced to the first strain gauge on the first elasticity girder, and indirect measurement equipment under test's stress need not destroy former equipment under test, and the installation is simple, safety, and scene strong adaptability.
Preferably, the mounting seat is provided with a mounting hole and is fixedly connected with the tested equipment through a screw. Only the mounting seat and the tested equipment are fixed, the original tested equipment does not need to be modified, the cost is low, and the installation is convenient.
Preferably, the mounting seat is adhered to the device to be tested. Only the mounting seat and the tested equipment are fixed, the original tested equipment does not need to be modified, the cost is low, and the installation is convenient.
Preferably, the mounting seat comprises a first mounting seat, a second mounting seat and a third mounting seat; the first elastic main beam is arranged between the first mounting seat and the second mounting seat, and the second elastic main beam is arranged between the second mounting block and the third mounting block. The scheme has the advantages of simple and reasonable structure, small volume, convenient use and low cost.
The invention has the beneficial effects that:
1. the stress of the tested equipment is indirectly measured, the structure of the original tested equipment does not need to be changed, and the device is simple and safe to install, simple in structure, low in cost, convenient to use and strong in scene adaptability.
2. The strain gauges which are perpendicular to each other are connected in parallel in an anti-phase mode, so that the temperature-sensitive thermal expansion and cold contraction compensation device has a thermal expansion and cold contraction compensation function during temperature change, and is strong in scene adaptability and temperature stability.
Drawings
FIG. 1 is a schematic diagram of a strain load cell configuration of the present invention.
Fig. 2 is a schematic diagram of a strain load cell circuit of the present invention.
FIG. 3 is a side view of a field installation of a strain load cell of the present invention.
In the figure, 1, a first elastic main beam, 2, a second elastic main beam, 3, a mounting block, 4, a first strain gauge, 5, a second strain gauge, 6, a screw rod and 7 are tested equipment.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b):
the strain force transducer of the embodiment is used for testing the strain of a device under test 7, and as shown in fig. 1, comprises a first elastic main beam 1, a second elastic main beam 2, a mounting block 3, a first strain gauge 4 and a second strain gauge 5.
The first elastic main beam 1 is arranged along the stress direction of the tested device 7, the second elastic main beam 2 is arranged perpendicular to the first elastic main beam 1, the first strain gauge 4 is arranged on the first elastic main beam 1, the second strain gauge 5 is arranged on the second elastic main beam 2, and the output ends of the first strain gauge 4 and the second strain gauge 5 are connected in parallel in an opposite phase mode.
The mount 3 includes a first mount, a second mount, and a third mount.
The first elastic main beam 1 and the second elastic main beam 2 are fixedly connected with a tested device 7 through the mounting base 3. First elasticity girder 1 sets up between first mount pad and second mount pad, and second elasticity girder 2 sets up between second installation piece and third installation piece.
The mounting seat 3 is provided with a mounting hole, and the mounting seat 3 is fixedly connected with the tested device 7 through a screw 6 or adhesion. Only the mounting seat and the tested equipment are fixed, the original tested equipment does not need to be modified, the cost is low, and the installation is convenient.
When equipment under test 7 receives the force deformation, because mount pad 3 and equipment under test 7 fixed connection, first mount pad and second mount pad take place the displacement along with equipment under test 7's surface deformation together, and make first elasticity girder 1 possess the deformation the same with equipment under test 7. The first strain gauges 4 on the first elastic main beams 1 detect the corresponding stress, and the second strain gauges 5 cannot detect the stress because the second elastic main beams 2 are perpendicular to the stress direction of the device under test 7. The stress of the tested equipment 7 is indirectly detected through the first elastic main beam 1 and the first strain gauge 4, the structure of the original tested equipment does not need to be changed, and the device is simple and safe to mount and convenient to use; the structure is simple, and the modification cost is low; can be used in each occasion, and has strong scene adaptability.
The first strain gauge 4 and the second strain gauge 5 are full-bridge strain gauges; the full-bridge strain gauge comprises a first resistance strain gauge, a second resistance strain gauge, a fourth resistance strain gauge and a third resistance strain gauge which are sequentially connected, and the third resistance strain gauge is connected with the first resistance strain gauge.
In the present embodiment, the first resistance strain gauge in the first strain gauge 4 is the strain gauge R11, the second resistance strain gauge is the strain gauge R12, the third resistance strain gauge is the strain gauge R13, and the fourth resistance strain gauge is the strain gauge R14. The first, second, third, and fourth strain gauges 5, R22, R23, and R24 are the first, second, and fourth strain gauges R21, R22, R23, and R24, respectively.
In the first strain gauge 4, the connection point of the strain gauge R11 and the strain gauge R13 is the positive input end E1+ of the first strain gauge 4, the connection point of the strain gauge R12 and the strain gauge R14 is the negative input end E1-of the first strain gauge 4, the connection point of the strain gauge R11 and the strain gauge R12 is the positive output end S1-of the first strain gauge 4, and the connection point of the strain gauge R13 and the strain gauge R14 is the negative output end S1-of the first strain gauge 4.
In the second strain gauge 5, the connection point of the strain gauge R21 and the strain gauge R23 is the positive input end E2+ of the second strain gauge 5, the connection point of the strain gauge R22 and the strain gauge R24 is the negative input end E2+ of the second strain gauge 5, the connection point of the strain gauge R21 and the strain gauge R22 is the positive output end S2+ of the second strain gauge 5, and the connection point of the strain gauge R23 and the strain gauge R24 is the negative output end S2-of the second strain gauge 5.
The positive input E1+ of the first strain gauge 4 is connected to the positive input E2+ of the second strain gauge 5, forming the positive input E + of the strain gauge cell, and the negative input E1-of the first strain gauge 4 is connected to the negative input E2-of the second strain gauge 5, forming the negative input E-of the strain gauge cell. The positive input end E-and the negative input end E-are respectively connected with the positive end and the negative end of the power supply.
The positive output terminal S1+ of the first strain gauge 4 is connected to the negative output terminal S2+ of the second strain gauge 5, forming the positive output terminal S + of the strain gauge, and the negative output terminal S1-of the first strain gauge 4 is connected to the positive input terminal S2+ of the second strain gauge 5, forming the negative output terminal S-of the strain gauge.
When the temperature changes, the outputs of the first strain gauge 4 and the second strain gauge 5 are simultaneously subjected to interference changes caused by thermal expansion and cold contraction of the tested device 7, the change trends are consistent, and the outputs of the first strain gauge 4 and the second strain gauge 5 are connected in parallel in an anti-phase mode, so that the output of the second strain gauge 5 can counteract the interference changes on the output of the first strain gauge 1. Avoid the measurement of stress to receive the influence of temperature, thermal stability is strong, not only makes the sensor of this scheme not only be applicable to indoorly, also is applicable to outdoor environment, and scene strong adaptability.
The scheme of the invention indirectly measures the stress of the tested device 7 without changing the structure of the original tested device 7, and has the advantages of simple and safe installation, simple structure, low cost, convenient use and strong scene adaptability. The strain gauges which are perpendicular to each other are connected in parallel in an anti-phase mode, so that the temperature-sensitive thermal expansion and cold contraction compensation device has a thermal expansion and cold contraction compensation function during temperature change, and is strong in scene adaptability and temperature stability.
Claims (7)
1. A strain gauge cell for testing the strain of a device under test (7); the device is characterized by comprising a first elastic main beam (1) and a second elastic main beam (2) which are vertically arranged, wherein the first elastic main beam (1) is arranged along the stress direction of the tested equipment (7); the first elastic main beam (1) and the second elastic main beam (2) are respectively provided with a first strain gauge (4) and a second strain gauge (5), and output ends of the first strain gauge (4) and the second strain gauge (5) are connected in parallel in an anti-phase mode.
2. A strain force transducer according to claim 1, characterized in that the first strain gauge (4) and the second strain gauge (5) are full bridge strain gauges; the positive input end of the first strain gauge (4) is connected with the positive input end of the second strain gauge (5), and the negative input end of the first strain gauge (4) is connected with the negative input end of the second strain gauge (5); the positive output end of the first strain gauge (4) is connected with the negative output end of the second strain gauge (5) to form the positive output end of the strain force measuring sensor, and the negative output end of the first strain gauge (4) is connected with the positive input end of the second strain gauge (5) to form the negative output end of the strain force measuring sensor.
3. The strain force transducer according to claim 2, wherein the full-bridge strain gauge comprises a first resistance strain gauge, a second resistance strain gauge, a fourth resistance strain gauge and a third resistance strain gauge which are connected in sequence, wherein the third resistance strain gauge is connected with the first resistance strain gauge; the connecting point of the first resistance strain gauge and the third resistance strain gauge is the positive input end of the full-bridge strain gauge, the connecting point of the second resistance strain gauge and the fourth resistance strain gauge is the negative input end of the full-bridge strain gauge, the connecting point of the first resistance strain gauge and the second resistance strain gauge is the positive output end of the full-bridge strain gauge, and the connecting point of the third resistance strain gauge and the fourth resistance strain gauge is the negative output end.
4. The strain force transducer according to claim 1, 2 or 3, wherein the first elastic main beam (1) and the second elastic main beam (2) are respectively provided with a mounting seat (3) at two ends thereof, and the first elastic main beam (1) and the second elastic main beam (2) are fixedly connected with the device under test (7) through the mounting seats (3).
5. Strain force transducer according to claim 4, wherein the mounting base (3) is provided with mounting holes, and the mounting base (3) is fixedly connected with the device under test (7) by means of screws (6).
6. Strain force transducer according to claim 4, wherein the mounting (3) is glued to the device under test (7).
7. A strain load cell according to claim 4, wherein said mounting seats (3) comprise a first mounting seat, a second mounting seat and a third mounting seat; the first elastic main beam (1) is arranged between the first mounting seat and the second mounting seat, and the second elastic main beam (2) is arranged between the second mounting block and the third mounting block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010530054.4A CN111780900B (en) | 2020-06-11 | 2020-06-11 | Strain force transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010530054.4A CN111780900B (en) | 2020-06-11 | 2020-06-11 | Strain force transducer |
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| Publication Number | Publication Date |
|---|---|
| CN111780900A true CN111780900A (en) | 2020-10-16 |
| CN111780900B CN111780900B (en) | 2022-06-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010530054.4A Active CN111780900B (en) | 2020-06-11 | 2020-06-11 | Strain force transducer |
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| Country | Link |
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| CN (1) | CN111780900B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114577318A (en) * | 2022-01-25 | 2022-06-03 | 常州纺织服装职业技术学院 | Vehicle-mounted weighing module and sensing method thereof |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114577318A (en) * | 2022-01-25 | 2022-06-03 | 常州纺织服装职业技术学院 | Vehicle-mounted weighing module and sensing method thereof |
| CN114577318B (en) * | 2022-01-25 | 2023-12-19 | 常州纺织服装职业技术学院 | Vehicle-mounted weighing module and sensing method thereof |
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| CN111780900B (en) | 2022-06-07 |
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