CN114878053A - Novel high accuracy cable force device of piezoelectric type - Google Patents
Novel high accuracy cable force device of piezoelectric type Download PDFInfo
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- CN114878053A CN114878053A CN202210625546.0A CN202210625546A CN114878053A CN 114878053 A CN114878053 A CN 114878053A CN 202210625546 A CN202210625546 A CN 202210625546A CN 114878053 A CN114878053 A CN 114878053A
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- 229910001285 shape-memory alloy Inorganic materials 0.000 claims abstract description 62
- 238000001514 detection method Methods 0.000 claims abstract description 46
- 238000005259 measurement Methods 0.000 claims abstract description 19
- 238000007781 pre-processing Methods 0.000 claims description 10
- 238000009434 installation Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 abstract description 9
- 239000013078 crystal Substances 0.000 description 14
- 230000006872 improvement Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 239000003921 oil Substances 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007716 flux method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
- G01L5/10—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means
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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
- G01L1/18—Measuring force or stress, in general using properties of piezo-resistive materials, i.e. materials of which the ohmic resistance varies according to changes in magnitude or direction of force applied to the material
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Abstract
The invention provides a piezoelectric type novel high-precision cable force device, which relates to the technical field of cable force detection and comprises a cable force detection unit and a sling, wherein the sling is connected to a bridge body, the cable force detection unit is connected to one end of the sling, the cable force detection unit comprises a memory alloy block and a piezoelectric type force sensor, one side inside the memory alloy block is provided with a mounting groove, and the piezoelectric type force sensor is arranged inside the mounting groove; the upper end of the memory alloy block is provided with a load sharing block, and the lower end of the memory alloy block is provided with a supporting plate; the lower end of the sling is connected with the piezoelectric force sensor in the cable force detection unit so as to detect the cable force of the sling, the load sharing block in the cable force detection unit is supported below the bridge body, the piezoelectric force sensor is extruded at one side below the load sharing block, and a load sharing effect is formed by the area ratio of the piezoelectric force sensor to the load sharing block, so that the sensor part bears the pretightening force, and the measurement range of the sensor is expanded.
Description
Technical Field
The invention relates to the technical field of cable force detection, in particular to a piezoelectric type novel high-precision cable force device.
Background
In the last 10 years, the highway bridges in China are increased at the speed of 2.7 ten thousand per year on average, and at the end of 2015, the highway bridges in China reach 77.9 ten thousand per year, so that the highway bridges become the first bridge and the country in the world, the measuring requirement of the pull-rope bridge is doubled, the development prospect is wide, in the pull-rope bridge, the steel cable is the core of the pull-rope bridge, and in the world, the accidents of the pull-rope bridge are multisourced, so the cable force detection of the steel cable is critical;
in the prior art, the cable force detection generally adopts an oil pressure reading method, a pressure sensor measuring method, a magnetic flux method and a frequency method, wherein the oil pressure reading method converts the cable force by the pressure of a jack hydraulic oil cylinder and calculates the cable force by reading an oil pressure value through an oil gauge, but the oil pressure gauge needs to be calibrated in advance, and the precision of the oil pressure gauge is lower than that of the pressure sensor; the pressure sensor measuring method is characterized in that a through pressure sensor is arranged at the front end of a jack, and the end stay tension is calculated through indicating values, but the end stay tension cannot be replaced or removed, and the unit price is high; the coil is wound on the stay cable by a magnetic flux method to form a small magnetic field, and the cable force of the stay cable is converted by measuring the change of the magnetic flux, but the manufacturing cost of the coil is high; in the frequency method, a sensor measures signals of the stay cable under manual or environmental excitation, calculates the frequency of the stay cable, and then calculates the cable force of the stay cable according to the frequency and cable structure parameters, but the test precision has certain deviation under the influence of bending rigidity, boundary conditions and the like, so that the invention provides a piezoelectric type novel high-precision cable force device to solve the problems in the prior art.
Disclosure of Invention
In order to solve the problems, the invention provides a piezoelectric type novel high-precision cable force device, which forms a load sharing effect through the area ratio of a piezoelectric type force sensor to a load sharing block, so that the sensor part bears pretightening force, and the measurement range of the sensor is expanded.
In order to realize the purpose of the invention, the invention is realized by the following technical scheme: the novel piezoelectric high-precision cable force device comprises a cable force detection unit and a cable, wherein the cable is connected to a bridge body, the cable force detection unit is connected to one end of the cable, the cable force detection unit comprises a memory alloy block and a piezoelectric force sensor, an installation groove is formed in one side inside the memory alloy block, and the piezoelectric force sensor is arranged inside the installation groove;
the upper end of memory alloy piece is equipped with the load sharing piece, and the lower extreme of memory alloy piece is equipped with the layer board, be equipped with the snap ring between the upper end of piezoelectric type force transducer and the load sharing piece, one side of the inside of load sharing piece is equipped with the perforating hole, the one end of hoist cable pass the perforating hole with piezoelectric type force transducer is connected.
The further improvement lies in that: the bridge body comprises a support and bridge plates, the bridge plates are mounted on the support, and the slings are connected between the two sides of the support and the bridge plates.
The further improvement lies in that: the cable force detection unit is arranged below the bridge plate, and the lower end of the sling penetrates through the bridge plate to be connected with the cable force detection unit.
The further improvement lies in that: the memory alloy block is characterized in that a first mounting hole is formed in the load sharing block, a first mounting bolt is arranged in the first mounting hole, and the load sharing block is connected with the memory alloy block through the first mounting bolt.
The further improvement lies in that: and a second mounting hole is formed in the supporting plate, a second mounting bolt is arranged in the second mounting hole, and the supporting plate is connected with the memory alloy block through the second mounting bolt.
The further improvement lies in that: the memory alloy block is made of temperature control memory alloy, and when the temperature of the memory alloy block reaches a critical point, the memory alloy block stretches, tensions the piezoelectric force sensor and starts to measure; when the memory alloy block is cooled, the memory alloy block contracts, and the piezoelectric force sensor does not participate in measurement.
The further improvement lies in that: the piezoelectric type force sensor comprises a shell, a crystal group and a cover body, wherein the crystal group is arranged inside the shell, the cover body covers the bottom of the shell, a mounting hole is formed in the upper portion of the shell, and the sling is connected with the crystal group through the mounting hole.
The further improvement lies in that: the signal output end of the piezoelectric force sensor is connected with the charge amplifier through a lead, the output end of the charge amplifier is connected with the embedded type pre-processing module PCB through a lead, and the embedded type pre-processing module PCB is connected with the control terminal.
The invention has the beneficial effects that:
1. the lower end of the sling is connected with the piezoelectric force sensor in the cable force detection unit so as to detect the cable force of the sling, the load sharing block in the cable force detection unit is supported below the bridge body, the piezoelectric force sensor is extruded at one side below the load sharing block, and a load sharing effect is formed by the area ratio of the piezoelectric force sensor to the load sharing block, so that the sensor part bears the pretightening force, and the measurement range of the sensor is expanded.
2. The temperature control memory alloy is adopted, when the temperature of the memory alloy block rises and reaches a critical point, the memory alloy block stretches downwards, the piezoelectric force sensor is tensioned to generate an offset downwards, the sensor starts to measure, and when the temperature is reduced, the memory alloy block contracts, the sensor does not participate in measurement, so that dynamic detection is performed on different stress variables, and the use is more reliable.
3. The invention adopts the crystal group to connect with the sling, utilizes the crystal group deformation to measure, has high sensitivity, is matched with the charge amplifier to amplify the signal charge and process the signal charge by the embedded pre-processing module PCB, is beneficial to accurately tracking the dynamic load change at high frequency, and has low part cost.
Drawings
FIG. 1 is a schematic view of the installation of the present invention;
FIG. 2 is a cross-sectional view of a cable force sensing unit of the present invention;
FIG. 3 is a schematic exploded view of the cable force detecting unit of the present invention;
FIG. 4 is a schematic exploded view of a piezoelectric force transducer according to the present invention;
fig. 5 is a schematic diagram of signal transmission according to the present invention.
Wherein: 1. a cable force detection unit; 2. a sling; 3. a memory alloy block; 4. a piezoelectric force sensor; 5. dividing the carrier block; 6. a support plate; 7. a snap ring; 8. a through hole; 9. a support; 10. a bridge plate; 11. a first mounting hole; 12. a first mounting bolt; 13. a second mounting hole; 14. a second mounting bolt; 15. a housing; 16. a crystal group; 17. a cover body; 18. a charge amplifier; 19. an embedded pre-processing module PCB.
Detailed Description
In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
Example one
According to the drawings of fig. 1, 2, 3 and 4, the embodiment provides a piezoelectric type novel high-precision cable force device, which comprises a cable force detection unit 1 and a sling 2, wherein the sling 2 is connected to a bridge body, the cable force detection unit 1 is connected to one end of the sling 2, the cable force detection unit 1 comprises a memory alloy block 3 and a piezoelectric type force sensor 4, a mounting groove is formed in one side inside the memory alloy block 3, and the piezoelectric type force sensor 4 is arranged inside the mounting groove;
the upper end of memory alloy piece 3 is equipped with partial loading block 5, and the lower extreme of memory alloy piece 3 is equipped with layer board 6, be equipped with snap ring 7 between the upper end of piezoelectric type force transducer 4 and the partial loading block 5, one side of partial loading block 5 inside is equipped with perforating hole 8, the one end of hoist cable 2 pass perforating hole 8 with piezoelectric type force transducer 4 is connected. When the cable force detection device is used, the sling 2 is connected to a bridge body, the lower end of the sling 2 is connected with the piezoelectric type force sensor 4 in the cable force detection unit 1, the cable force detection unit 1 is arranged below the bridge body to detect the cable force of the sling 2, in the structure, the partial loading block 5 is supported below the bridge body, the piezoelectric type force sensor 4 is extruded on one side below the partial loading block 5, and a partial loading effect is formed by the area ratio of the piezoelectric type force sensor 4 to the partial loading block 5, so that the sensor part bears the pre-tightening force, the measurement range of the sensor is expanded, meanwhile, when any problem exists in the piezoelectric type force sensor 4, the partial loading block 5 bears the pre-tightening force, the pre-tightening force of the sling 2 is not changed, and a safety effect is formed.
The bridge body comprises a support 9 and a bridge plate 10, wherein the bridge plate 10 is installed on the support 9, and the suspension ropes 2 are connected between two sides of the support 9 and the bridge plate 10. The cable force detection unit 1 is arranged below the bridge plate 10, and the lower end of the sling 2 penetrates through the bridge plate 10 and is connected with the cable force detection unit 1. When the cable force detection device is used, the lower end of a sling 2 is connected with a piezoelectric force sensor 4 in a cable force detection unit 1, the cable force detection unit 1 is arranged below a bridge plate, the sling 2 is connected with a support 9 and the bridge plate 10 to detect the cable force of the sling 2, in the structure, a load sharing block 5 is supported below the bridge plate 10, the piezoelectric force sensor 4 is extruded on one side below the load sharing block 5, and a load sharing effect is formed by the area ratio of the piezoelectric force sensor 4 to the area of the load sharing block 5, so that the sensor part bears the pretightening force, and the measurement range of the sensor is expanded.
The load sharing block 5 is provided with a first mounting hole 11, a first mounting bolt 12 is arranged inside the first mounting hole 11, and the load sharing block 5 is connected with the memory alloy block 3 through the first mounting bolt 12. And a second mounting hole 13 is formed in the supporting plate 6, a second mounting bolt 14 is arranged in the second mounting hole 13, and the supporting plate 6 is connected with the memory alloy block 3 through the second mounting bolt 14. When in use, the bearing block 5 is fixed above the memory alloy block 3 through the first mounting bolt 12, then the load-sharing block 5 is arranged below the bridge plate 10, and the supporting plate 6 is fixed below the memory alloy block 3 through the second mounting bolt 14.
The memory alloy block 3 is made of temperature control memory alloy, and when the temperature of the memory alloy block 3 reaches a critical point, the memory alloy block 3 stretches to tension the piezoelectric force sensor 4 to start measurement; when the memory alloy block 3 is cooled, the memory alloy block 3 contracts, and the piezoelectric force sensor 4 does not participate in measurement. When the temperature of the memory alloy block 3 is raised to reach a critical point, the memory alloy block 3 stretches downwards, the piezoelectric force sensor 4 is tensioned to generate an offset downwards, the piezoelectric force sensor 4 bears the load and starts to measure, when the temperature is reduced, the memory alloy block 3 contracts, the piezoelectric force sensor 4 does not participate in measurement, dynamic detection is carried out on different stress variables, and the use is more reliable.
Piezoelectric type force transducer 4 includes casing 15, brilliant group 16 and lid 17, brilliant group 16 is established the inside of casing 15, lid 17 lid is established the bottom at casing 15, the top of casing 15 is equipped with the mounting hole, hoist cable 2 passes through the mounting hole and is connected with brilliant group 16. When the device is used, the crystal group 16 is adopted to be connected with the sling, the deformation of the crystal group 16 is utilized to carry out measurement, the sensitivity is high, and the cost of parts is low.
Example two
According to fig. 1, 2, 3, 4 and 5, the embodiment provides a novel piezoelectric high-precision cable force device, which comprises a cable force detection unit 1 and a sling 2, wherein the sling 2 is connected to a bridge body, the cable force detection unit 1 is connected to one end of the sling 2, the cable force detection unit 1 comprises a memory alloy block 3 and a piezoelectric force sensor 4, one side inside the memory alloy block 3 is provided with an installation groove, and the piezoelectric force sensor 4 is arranged inside the installation groove;
the upper end of memory alloy piece 3 is equipped with partial loading block 5, and the lower extreme of memory alloy piece 3 is equipped with layer board 6, be equipped with snap ring 7 between the upper end of piezoelectric type force transducer 4 and the partial loading block 5, one side of partial loading block 5 inside is equipped with perforating hole 8, the one end of hoist cable 2 pass perforating hole 8 with piezoelectric type force transducer 4 is connected. When the cable force detection device is used, the sling 2 is connected to a bridge body, the lower end of the sling 2 is connected with the piezoelectric type force sensor 4 in the cable force detection unit 1, the cable force detection unit 1 is arranged below the bridge body to detect the cable force of the sling 2, in the structure, the partial loading block 5 is supported below the bridge body, the piezoelectric type force sensor 4 is extruded on one side below the partial loading block 5, and a partial loading effect is formed by the area ratio of the piezoelectric type force sensor 4 to the partial loading block 5, so that the sensor part bears the pre-tightening force, the measurement range of the sensor is expanded, meanwhile, when any problem exists in the piezoelectric type force sensor 4, the partial loading block 5 bears the pre-tightening force, the pre-tightening force of the sling 2 is not changed, and a safety effect is formed.
Piezoelectric type force transducer 4 includes casing 15, brilliant group 16 and lid 17, brilliant group 16 is established the inside of casing 15, lid 17 lid is established the bottom at casing 15, the top of casing 15 is equipped with the mounting hole, hoist cable 2 passes through the mounting hole and is connected with brilliant group 16. When the device is used, the crystal group 16 is adopted to be connected with the sling, the deformation of the crystal group 16 is utilized to carry out measurement, the sensitivity is high, and the cost of parts is low.
The signal output end of the piezoelectric force sensor 4 is connected with the charge amplifier 18 through a lead, the output end of the charge amplifier 18 is connected with the embedded pre-processing module PCB19 through a lead, and the embedded pre-processing module PCB19 is connected with the control terminal. When the device is used, the crystal group 16 is connected with the sling, the deformation of the crystal group 16 is utilized for measurement, the sensitivity is high, the device is matched with the charge amplifier 18 to amplify signal charges, the embedded pre-processing module PCB19 is used for processing, a detection signal is transmitted to the control terminal, and the device is favorable for accurately tracking the dynamic load change at high frequency.
According to the invention, the lower end of a sling 2 is connected with a piezoelectric force sensor 4 in a sling force detection unit 1, the sling force detection unit 1 is arranged below a bridge plate, and the sling 2 is connected with a support 9 and the bridge plate 10 so as to detect the cable force of the sling 2. Meanwhile, when any problem exists in the piezoelectric force sensor 4, the piezoelectric force sensor is borne by the load sharing block 5, the pretightening force of the sling 2 is not changed, and a safety effect is formed. In addition, the memory alloy block 3 is made of temperature control memory alloy, when the temperature of the memory alloy block 3 is raised and reaches a critical point, the memory alloy block 3 stretches downwards, the piezoelectric force sensor 4 is tensioned to generate an offset downwards, the piezoelectric force sensor 4 starts to carry out measurement, when the temperature is reduced, the memory alloy block 3 contracts, the piezoelectric force sensor 4 does not participate in measurement, dynamic detection is conducted on different stress variables, and the use is more reliable. Finally, the crystal group 16 is connected with the sling, the deformation of the crystal group 16 is used for measurement, the sensitivity is high, the signal charge amplification and the embedded pre-processing module PCB19 are processed by matching with the charge amplifier 18, the accurate high-frequency tracking of the dynamic load change is facilitated, and the cost of parts is low.
The foregoing shows and describes the general principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The utility model provides a novel high accuracy cable force device of piezoelectric type, includes cable force detecting element (1) and hoist cable (2), its characterized in that: the cable force detection device comprises a sling (2), a cable force detection unit (1), a piezoelectric force sensor (4), a memory alloy block (3), a cable and a cable, wherein the sling (2) is connected to a bridge body, the cable force detection unit (1) is connected to one end of the sling (2), the cable force detection unit (1) comprises the memory alloy block (3) and the piezoelectric force sensor (4), an installation groove is formed in one side of the interior of the memory alloy block (3), and the piezoelectric force sensor (4) is arranged in the installation groove;
the upper end of memory alloy piece (3) is equipped with branch carrier block (5), and the lower extreme of memory alloy piece (3) is equipped with layer board (6), be equipped with snap ring (7) between the upper end of piezoelectric type force transducer (4) and branch carrier block (5), one side of branch carrier block (5) inside is equipped with perforating hole (8), the one end of hoist cable (2) is passed perforating hole (8) with piezoelectric type force transducer (4) are connected.
2. The piezoelectric novel high-precision cable force device according to claim 1, wherein: the bridge body comprises a support (9) and a bridge plate (10), the bridge plate (10) is installed on the support (9), and the sling (2) is connected between the two sides of the support (9) and the bridge plate (10).
3. The piezoelectric novel high-precision cable force device according to claim 2, wherein: the cable force detection unit (1) is arranged below the bridge plate (10), and the lower end of the sling (2) penetrates through the bridge plate (10) to be connected with the cable force detection unit (1).
4. The piezoelectric novel high-precision cable force device according to claim 1, wherein: be equipped with first mounting hole (11) on year piece (5), and the inside of first mounting hole (11) is equipped with first mounting bolt (12), year piece (5) through first mounting bolt (12) with memory alloy piece (3) are connected.
5. The piezoelectric novel high-precision cable force device according to claim 4, wherein: the memory alloy block is characterized in that a second mounting hole (13) is formed in the supporting plate (6), a second mounting bolt (14) is arranged in the second mounting hole (13), and the supporting plate (6) is connected with the memory alloy block (3) through the second mounting bolt (14).
6. The piezoelectric novel high-precision cable force device according to claim 1, wherein: the memory alloy block (3) is made of temperature control memory alloy, and when the temperature of the memory alloy block (3) reaches a critical point, the memory alloy block (3) stretches to tension the piezoelectric force sensor (4) to start measurement; when the memory alloy block (3) is cooled, the memory alloy block (3) contracts, and the piezoelectric force sensor (4) does not participate in measurement.
7. The piezoelectric novel high-precision cable force device according to claim 1, wherein: piezoelectric type force transducer (4) include casing (15), brilliant group (16) and lid (17), establish brilliant group (16) the inside of casing (15), the bottom at casing (15) is established in lid (17) lid, the top of casing (15) is equipped with the mounting hole, hoist cable (2) are connected with brilliant group (16) through the mounting hole.
8. The piezoelectric novel high-precision cable force device according to claim 7, wherein: the signal output end of the piezoelectric type force sensor (4) is connected with the charge amplifier (18) through a lead, the output end of the charge amplifier (18) is connected with the embedded pre-processing module PCB (19) through a lead, and the embedded pre-processing module PCB (19) is connected with the control terminal.
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| CN202210625546.0A CN114878053B (en) | 2022-06-02 | 2022-06-02 | Novel high-precision cable force device of piezoelectric type |
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| CN202210625546.0A CN114878053B (en) | 2022-06-02 | 2022-06-02 | Novel high-precision cable force device of piezoelectric type |
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| CN114878053B CN114878053B (en) | 2024-04-19 |
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