CN104992216A - Magnetorheological-effect-based piezoelectric-pulse-counting flow density detection apparatus - Google Patents
Magnetorheological-effect-based piezoelectric-pulse-counting flow density detection apparatus Download PDFInfo
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- CN104992216A CN104992216A CN201510398588.5A CN201510398588A CN104992216A CN 104992216 A CN104992216 A CN 104992216A CN 201510398588 A CN201510398588 A CN 201510398588A CN 104992216 A CN104992216 A CN 104992216A
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- 238000001514 detection method Methods 0.000 title abstract description 3
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 238000007789 sealing Methods 0.000 claims abstract description 5
- 238000010276 construction Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 5
- 238000000518 rheometry Methods 0.000 claims description 5
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 238000002955 isolation Methods 0.000 abstract 1
- 230000037396 body weight Effects 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
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Abstract
The invention relates to a magnetorheological-effect-based piezoelectric-pulse-counting flow density detection apparatus for measuring a flow intensity in a selected area. The overall structure of the apparatus is in a symmetric mode. The apparatus comprises a support plate, a piston rod, a piston, a contact, a housing, magnetorheological liquid, a solenoid coil, a sealing ring, a piezoelectric plate, an isolation ring, and a reset spring. An initial current of the solenoid coil is adjusted, so that a flowing deformation phenomenon occurs at the magnetorheological liquid and a certain cutting yield force is realized, wherein the yield force is less than the restoring force of the reset spring after compression. Because the weight of the person presses the support plate, the piston is driven by the piston rod to make cutting motion on the magnetorheological liquid; the piston drives the contact to press the piezoelectric plate, so that the piezoelectric plate generates power to form a pulse. A flow intensity of the crowd in a specific weight range at a selected area can be monitored in real time by adjusting the spring coefficient of the reset spring and the current of the solenoid coil.
Description
Technical field
The present invention relates to stream of people's device for detecting density, especially relate to stream of people's device for detecting density that the piezoelectric pulses based on magnetic rheology effect counts.
Background technology
Often there is crowd's undue concentration in public places such as People's Square, large supermarket, stations, thus cause all security incidents to occur, therefore, need to carry out Real-Time Monitoring to the stream of people of these public places, to manage, avoid accident to occur.
The detection adopting various sensing technology or video image processing technology etc. public place to be carried out to people's current density at present more.Such as, application number be 201420465463.0 China's utility model " a kind of stream of people detects carpet " be exactly utilize inner integrated transmitter and sensor to carry out Real-Time Monitoring to people's current density, the heat produced during the work of this device, and all can produce certain impact to the precision of testing result from the vibration and humidity etc. of outside, therefore inventor adds various sound-proof material, acoustical material, heat-absorbing material and anti-corrosion material etc. in this device, and this makes the cost of this device greatly improve undoubtedly.In addition, application number is China's patent of invention " counter for person number at exit and entrance " of 200510025186.7, camera shooting is used to carry out population image analysis processing, but this algorithm research and development are very difficult, simultaneously due to the restriction of know-why, to shaven head, white hair and the special population resolution such as to be branded as not high.These two innovation and creation also have a common defect: can not carry out Real-Time Monitoring to people's current density with specific weight range crowd.Therefore.Develop a kind of physical construction simple, low to the susceptibility of environment, testing result precision is high, and stream of people's device for detecting density that can carry out Real-Time Monitoring to the close mobility of the stream of people with specific weight range crowd is significant.
Summary of the invention
It is simple that the technical problem to be solved in the present invention is to provide a kind of physical construction, and low to the susceptibility of environment, testing result precision is high, and can carry out stream of people's device for detecting density of Real-Time Monitoring to people's current density with specific weight range crowd.
In order to effectively realize the feature as above of hydraulic pressure sensor, the present invention realizes as follows: this device mainly by back up pad, piston rod, piston, contact, shell, magnetic flow liquid, solenoid, O-ring seal, piezoelectric patches, cage ring, back-moving spring forms; The one-piece construction of this device is symmetrical, each antimeric shell is divided into two chambers: one of them chamber is by the sealing of piston rod, contact and O-ring seal, magnetic flow liquid is full of this sealed chamber, another chamber is by contact and O-ring seal sealing, and piezoelectric patches is arranged on this chamber; Piston has a groove, and solenoid is inside this groove, and magnetic flow liquid and solenoid are isolated by cage ring, back up pad is arranged on above piston rod, and is provided with back-moving spring between back up pad and shell.
Regulate the initial current of solenoid, make magnetic flow liquid generation rheological phenomena, there is certain shear yielding power, and this yield force is less than back-moving spring by the restoring force after compressing, due to the gravity compressing back up pad of people, drive piston by piston rod, make piston do shearing motion to magnetic flow liquid, piston driving contact compressing piezoelectric patches, makes piezoelectric patches send a pulse.Regulate the electric current of two of this device antimeric spring constants, solenoid can carry out stream of people's density measure to the crowd with different weight in selection area respectively: the size regulating the electric current of this device two antimeric solenoids, make two of this device antimeric magnetic flow liquids generations rheological phenomena in various degree, be in different initial shear yield situations, then regulate the elasticity coefficient of back-moving spring to make restoring force be greater than the initial shear yield force of respective symmetric part magnetic flow liquid.Therefore, , a people steps down in two back up pads (because pick-up unit size is much smaller than sole size, so must be step down in two back up pads simultaneously) time, when the body weight of people is all greater than two initial shear yield forces, two piezoelectric patches all have a pulse out, then output 0 is subtracted each other by subtracter, when the body weight of people is all less than two initial shear yield forces, two piezoelectric patches all do not export pulse, when the body weight of people is between two initial shear yield forces, a pulse is only had to export, output or 1 is subtracted each other through subtracter, last counter adds 1.
Accompanying drawing explanation
Fig. 1 is the inner structure schematic diagram of stream of people's device for detecting density of the piezoelectric pulses counting that the present invention is based on magnetic rheology effect
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in more detail.
In FIG, the present invention is based on stream of people's device for detecting density of the piezoelectric pulses counting of magnetic rheology effect, its inner structure is mainly made up of back up pad 1, piston rod 2, piston 3, contact 4, shell 5, magnetic flow liquid 6, solenoid 7, O-ring seal 8, piezoelectric patches 9, cage ring 10, back-moving spring 11.The one-piece construction of this device is symmetrical, each antimeric shell 5 is divided into two chambers: one of them chamber is sealed by piston rod 2, contact 4 and O-ring seal 8, magnetic flow liquid 6 is full of this sealed chamber, another chamber is sealed by contact 4 and O-ring seal 8, and piezoelectric patches 9 is contained in this chamber; Piston 3 has a groove, and magnetic flow liquid 6 and solenoid 7, inside this groove, are isolated by cage ring 10 by solenoid 7; Back up pad 1 is arranged on above piston rod 2, and is provided with back-moving spring 11 between back up pad 1 and shell 5.
Regulate the initial current of solenoid 7, make magnetic flow liquid 6 that rheological phenomena occur, there is certain shear yielding power, and this yield force is less than back-moving spring 11 by the restoring force after compressing, due to the gravity compressing back up pad 1 of people, drive piston 3 by piston rod 2, make piston 3 pairs of magnetic flow liquids 6 do shearing motion, piston 3 is with moving contact 4 to oppress piezoelectric patches 9, makes piezoelectric patches 9 send a pulse.Regulate the electric current of two of this device antimeric spring constants, solenoid 7 can carry out stream of people's density measure to the crowd with different weight in selection area respectively: the size regulating the electric current of the antimeric solenoid 7 of two, this device, make the rheological phenomena that two of this device antimeric magnetic flow liquids 6 occur in various degree, be in different initial shear yield situations, then regulate the elasticity coefficient of back-moving spring 11 to make restoring force be greater than the initial shear yield force of respective symmetric part magnetic flow liquid 6.Therefore, , a people steps down in two back up pads 1 (because pick-up unit size is much smaller than sole size, so must be step down in two back up pads simultaneously) time, when the body weight of people is all greater than two initial shear yield forces, two piezoelectric patches 9 all have a pulse out, then output 0 is subtracted each other by subtracter, when the body weight of people is all less than two initial shear yield forces, two piezoelectric patches 9 all do not export pulse, when people body weight between two initial shear yield forces be time, a pulse is only had to export, output or 1 is subtracted each other through subtracter, last counter adds 1.
Claims (1)
1., based on stream of people's device for detecting density that the piezoelectric pulses of magnetic rheology effect counts, be mainly made up of back up pad, piston rod, piston, contact, shell, magnetic flow liquid, solenoid, O-ring seal, piezoelectric patches, cage ring, back-moving spring; It is characterized in that: the one-piece construction of this device is symmetrical; Described each antimeric shell (5) is divided into two chambers: one of them chamber is by the sealing of piston rod (2), contact (4) and O-ring seal (8), magnetic flow liquid (6) is full of this sealed chamber, another chamber is by contact (4) and O-ring seal (8) sealing, and piezoelectric patches (9) is arranged on this chamber; Described piston (3) has a groove, and magnetic flow liquid (6) and solenoid (7), inside this groove, are isolated by cage ring (10) by solenoid (7); Described back up pad (1) is arranged on above piston rod (2), and is provided with back-moving spring (11) between back up pad (1) and shell (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510398588.5A CN104992216B (en) | 2015-07-01 | 2015-07-01 | The density of stream of people detection means that piezoelectric pulses based on magnetic rheology effect are counted |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510398588.5A CN104992216B (en) | 2015-07-01 | 2015-07-01 | The density of stream of people detection means that piezoelectric pulses based on magnetic rheology effect are counted |
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| Publication Number | Publication Date |
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| CN104992216A true CN104992216A (en) | 2015-10-21 |
| CN104992216B CN104992216B (en) | 2017-09-29 |
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| CN201510398588.5A Active CN104992216B (en) | 2015-07-01 | 2015-07-01 | The density of stream of people detection means that piezoelectric pulses based on magnetic rheology effect are counted |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110853200A (en) * | 2019-11-29 | 2020-02-28 | 河南职业技术学院 | Device for limiting number of people in closed occasions |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104134313A (en) * | 2014-03-09 | 2014-11-05 | 浙江师范大学 | Selective alarm based on magnetorheological fluid |
| CN204354836U (en) * | 2014-11-23 | 2015-05-27 | 浙江师范大学 | A kind of vehicle-mounted apparatus for warning overload based on magnetic rheology effect |
| CN204856578U (en) * | 2015-07-01 | 2015-12-09 | 孙美娜 | People's current density detection device of piezoelectricity pulse count based on magnetic current becomes effect |
-
2015
- 2015-07-01 CN CN201510398588.5A patent/CN104992216B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104134313A (en) * | 2014-03-09 | 2014-11-05 | 浙江师范大学 | Selective alarm based on magnetorheological fluid |
| CN204354836U (en) * | 2014-11-23 | 2015-05-27 | 浙江师范大学 | A kind of vehicle-mounted apparatus for warning overload based on magnetic rheology effect |
| CN204856578U (en) * | 2015-07-01 | 2015-12-09 | 孙美娜 | People's current density detection device of piezoelectricity pulse count based on magnetic current becomes effect |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110853200A (en) * | 2019-11-29 | 2020-02-28 | 河南职业技术学院 | Device for limiting number of people in closed occasions |
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| CN104992216B (en) | 2017-09-29 |
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Inventor after: Zhang Guang Inventor before: Sun Meina |
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Effective date of registration: 20170830 Address after: 325213 Ruian village, Yongan, Zhejiang, China, Yongsheng Applicant after: Zhang Guang Address before: 314409 Zhejiang city of Haining province Xu Cun Zhen Jing Shu Cun large pavilion No. 37 Applicant before: Sun Meina |
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Effective date of registration: 20181220 Address after: 525024 206 group six, poxia village, Xintian, mannan Town, Maonan District, Maoming, Guangdong Patentee after: Zhong Mingle Address before: 325213 Yongsheng Village, Yongan Township, Ruian City, Zhejiang Province Patentee before: Zhang Guang |
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Effective date of registration: 20190524 Address after: 226000 Tangfang Village, Zhangzhishan Town, Tongzhou District, Nantong City, Jiangsu Province Patentee after: Chuanmu Intelligent Equipment Jiangsu Co., Ltd. Address before: 525024 206 group six, poxia village, Xintian, mannan Town, Maonan District, Maoming, Guangdong Patentee before: Zhong Mingle |
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