CN202853813U - Elevator roller stress field detection and node energy collection device - Google Patents
Elevator roller stress field detection and node energy collection device Download PDFInfo
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- CN202853813U CN202853813U CN2012205474299U CN201220547429U CN202853813U CN 202853813 U CN202853813 U CN 202853813U CN 2012205474299 U CN2012205474299 U CN 2012205474299U CN 201220547429 U CN201220547429 U CN 201220547429U CN 202853813 U CN202853813 U CN 202853813U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The utility model relates to an elevator roller stress field detection and node energy collection device, comprising an elevator roller, stress wireless sensor working nodes, stress wireless sensor redundancy nodes, a converge node, a USB interface and an industrial control computer, wherein a minisize wind turbine and a stress wireless sensor are integrally designed, the stress wireless sensor working and redundancy nodes are fixed on the elevator roller, the device is powered by a mixed structure formed by a lithium ion battery and the minisize wide turbine based on the wind-induced vibration principle, the converge nodes are fixed on the housing of an elevator operation table, and the converge node is connected with the industrial control computer through the USB interface. The device is safe and reliable; a sensor network employs a redundancy framework, and even if one node breaks down, the normal operation of a system cannot be influenced; the stress wireless sensor nodes are powered by the mixed structure, thereby enabling various assemblies have complementary advantages, and realizing the permanent power supply of the sensor; and the elevator roller stress field detection and node energy collection device is simple in structure, low in cost, is combined with the lithium ion battery to form the mixed structure, and saves the space.
Description
Technical field
The present invention relates to a kind of cylinder stress field pick-up unit, particularly a kind of elevator drum stress field detects and the node energy gathering-device.
Background technology
At present, to the monitoring of hoister running status all by the hoisting cable force measurements is realized.The detection method of hoisting cable tension force comprises direct Detection Method and indirect detection method.Direct Detection Method is that steel cable tension tester is installed on the hoisting conveyance top, and this device is made of sensor, signal acquisition module, wireless transmitter module and accumulator.The steel wire rope tension signal that detects sends by wireless transmitter module, carries out the data processing after being accepted by the receiver module of well head and obtains steel wire rope tension.Detection mainly contains following three kinds with the sensor of steel wire rope tension: pulling force sensor is connected between the hoisting cable hoisting conveyance; The bikini armored rope tension sensor; Oil pressure sensor is applicable to have between hoisting conveyance and the wire rope multirope friction winder of hydraulic balance device.Mainly there are four point defects in direct Detection Method: the transmission range of radio communication in pit shaft is short, when mine shaft depth surpasses 500 meters, can't realize reliable communication; Accumulator needs periodic replacement, safeguards inconvenience; Installation of sensors is safeguarded inconvenience; Pulling force sensor sensitivity is low, and tension pick-up can aggravate the fatigue wear of wire rope, and oil pressure sensor is only suitable for directly having for hoisting conveyance and wire rope the occasion of hydraulic balance device.Indirect detection method is at the bearing base of head sheave force cell to be installed to detect steel wire rope tension.The method requires force cell to have structure practicality, practical function, long-time stability and high reliability.Sensor design is difficult, cost is very high, and is difficult to install.When damaging, sensor also is difficult in time find.
Can find that according to above analysis the at present detection by hoisting cable tension force reflects that mainly there is following defective in the method for hoister running status: installation of sensors inconvenience, detection system is difficult in maintenance; Detection system is used has certain limitation, can not be applied to deep-well and detect; Battery-driven scheme need to regularly replace battery, safeguards inconvenience; Existing sensor exists that cost is high, sensitivity is low, wire rope is had the problem such as infringement.
Summary of the invention
The objective of the invention is to provide a kind of Maintenance free, can be applied to that deep-well detects, sensor life-time is unlimited, cost is low, highly sensitive, the harmless elevator drum stress field of wire rope is detected and the node energy gathering-device.
Elevator drum stress field of the present invention detects and the node energy gathering-device, comprises elevator drum, stress wireless senser working node, stress wireless senser redundant node, aggregation node, USB interface and industrial computer; Stress wireless senser working node and redundant node evenly are fixed on the elevator drum at intervals, and aggregation node is fixed on the hoister operator's console shell, and aggregation node links to each other with industrial computer by USB interface.
Described stress wireless senser working node and redundant node consist of by micro wind turbine generator, synchronous charge-extraction circuit, Buck-Boost pressure regulator, foil gauge, signal conditioning circuit, MCU microcontroller chip, UWB radio transmitting and receiving chip, FLASH extended memory, PCB antenna, clock chip and power module; Foil gauge is connected with signal conditioning circuit, the output terminal of signal conditioning circuit is connected with the input end of MCU microcontroller chip, the output terminal of MCU microcontroller chip and UWB radio transmitting and receiving chip, the FLASH extended memory connects, the clock chip output terminal links to each other with the MCU microcontroller chip, UWB radio transmitting and receiving chip output terminal is connected with the PCB antenna, micro wind turbine generator is connected with synchronous charge-extraction circuit, the charge-extraction circuit is connected with power module synchronously, power module is connected with the Buck-Boost pressure regulator, Buck-Boost pressure regulator and signal conditioning circuit, the MCU microcontroller chip, the UWB radio transmitting and receiving chip is connected with clock chip.
Described micro wind turbine generator is the miniature piezoelectric aerogenerator based on wind-induced vibration mechanism, and described miniature piezoelectric aerogenerator is comprised of silicon substrate, piezoelectricity composite beam and mass; The piezoelectricity composite beam adopts cantilever beam structure, adopt micro-processing technology that one end is fixed on the silicon substrate, contain multilayer PZT piezoelectric patches in the piezoelectricity composite beam, the upper and lower surface of every one deck PZT piezoelectric patches all has metal electrode to be used to collect electric charge, and wherein the metal electrode between every two-layer PZT piezoelectric patches shares; Mass is positioned at piezoelectricity composite beam free end.
Described aggregation node is made of MCU microcontroller chip, UWB radio transmitting and receiving chip, FLASH extended memory, usb circuit, PCB antenna, clock chip, AC-DC switch power module and low pressure difference linear voltage regulator; The output terminal of MCU microcontroller chip and UWB radio transmitting and receiving chip, FLASH extended memory and usb circuit join, clock chip links to each other with the MCU microcontroller chip, the UWB radio transmitting and receiving chip is connected with the PCB antenna, the AC-DC switch power module output terminal that is connected with alternating current is connected with low pressure difference linear voltage regulator, and low pressure difference linear voltage regulator is connected with clock chip with MCU microcontroller chip, UWB radio transmitting and receiving chip.
Beneficial effect, owing to adopted such scheme, adopt the power supply of miniature piezoelectric aerogenerator and lithium battery mixed structure counter stress wireless sensor node, so that each assembly is had complementary advantages: with the energy source of energy harvester-miniature piezoelectric aerogenerator as system, it can export unlimited energy, but underpower is directly to power to wireless senser, and the output power of battery is higher, but the finite energy of storage, therefore it is used as the power buffer memory, output power then when needing is constantly accepted electric charge from gatherer At All Other Times; Described micro wind turbine generator is captured the wind energy of drum rotating drive and is converted into electric energy, because air toughness, the existence of viscosity makes near the gas the cylinder surface rotate with cylinder, the speed of cylinder is generally several metre per second (m/s)s to tens metre per second (m/s)s, much smaller than the velocity of sound, so can regard near the gas that rotates with cylinder the cylinder as rational incompressible fluid.Cylinder pivots in viscous incompressible fluid, and the circular stream line motion of the gas that viscosity causes is equivalent to the flow field of the ideal fluid irrotational flow that point unit vortex induces.The speed of supposing cylinder is
v 0, the gas of cylinder surface is attached to cylinder surface with speed
v 0Rotate around cylinder axis, relative with cylinder static, the gas flow rate on it reduces with the increase inverse proportion of radius of turn.
Mass is positioned at the piezoelectric cantilever free end, regulate the frequency of piezoelectricity composite beam, and in wind, form vortex as bluff body, vortex shedding causes the vibration of mass, cause the distortion of piezoelectric cantilever, and then cause the variation of piezoelectricity internal stress and strain, because piezoelectric effect, the electric potential difference that will change between the upper/lower electrode of piezoelectric layer realizes the power supply to lithium ion battery.
(1) based on wireless sensor network technology, by design stress wireless senser working node, stress wireless senser redundant node and aggregation node, realized elevator drum stress is detected;
(2) based on the little energy technology of MEMS, by the mixed structure that the miniature piezoelectric aerogenerator is combined with lithium battery wireless strain gauge node is powered, realized the wireless sensor node Maintenance free, the advantage that the life-span is unlimited, and reduced node size;
(3) this elevator drum stress field detection method can not brought any potential safety hazard to elevator system with device, and is safe and reliable;
(4) adopt the UWB the Technology of Ultra, have very high traffic rate and communication reliability, system responses is quick, and is low in energy consumption;
(5) simple in structure, stability is strong, and reliability is high, install simple, Maintenance free, cost low, highly sensitive, can be used in deep-well and detect.
Maintenance free, can be applied to that deep-well detects, sensor life-time is unlimited, cost is low, highly sensitive, harmless to wire rope, reach purpose of the present invention.
Advantage: the pick-up unit of this elevator drum stress field can not bring any potential safety hazard to hoister, and is safe and reliable; Sensor network adopts redundant framework, even certain node breaks down and also can not affect system and normally move; Adopt the power supply of mixed structure counter stress wireless senser working node and redundant node, so that each assembly has complementary advantages, realized that sensor forever powers.And do not need rotating mechanism based on the miniature piezoelectric aerogenerator of wind-induced vibration mechanism, and simple in structure, be convenient to adopt little silicon processing technique to produce in batches, cost is low, becomes mixed structure with assembling lithium ion battery, has saved greatly the space.
Description of drawings
Fig. 1 is system construction drawing of the present invention;
Fig. 2 is the structural drawing of stress wireless senser working node of the present invention and redundant node;
Fig. 3 is the structural drawing of stress wireless senser working node of the present invention and redundant node;
Fig. 4 is the structural drawing of piezoelectricity wind-power electricity generation micro-system of the present invention;
Fig. 5 is the circuit diagram of synchronous charge-extraction circuit of the present invention;
Fig. 6 is the circuit diagram of Buck-Boost pressure regulator of the present invention;
Fig. 7 is the circuit diagram of lithium battery protection circuit of the present invention;
Fig. 8 is the structural drawing of aggregation node of the present invention.
Among the figure: 1, stress wireless senser working node; 2, stress wireless senser redundant node; 1 (2)-1, stress wireless senser and synchronously charge-extraction circuit; 1 (2)-2, piezoelectricity composite beam; 1 (2)-3, mass; 1 (2)-4, silicon substrate; 3, elevator drum; 4, aggregation node; 5, usb bus; 6, industrial computer; 7, operator's console.
Embodiment
Embodiment 1: the present invention includes apparatus and method, this device comprises: elevator drum, stress wireless senser working node, stress wireless senser redundant node, aggregation node, USB interface and industrial computer; Stress wireless senser working node and redundant node evenly are fixed on the elevator drum at intervals, and aggregation node is fixed on the hoister operator's console shell, and aggregation node links to each other with industrial computer by USB interface.
Described stress wireless senser working node and redundant node consist of by micro wind turbine generator, synchronous charge-extraction circuit, Buck-Boost pressure regulator, foil gauge, signal conditioning circuit, MCU microcontroller chip, UWB radio transmitting and receiving chip, FLASH extended memory, PCB antenna, clock chip and power module; Foil gauge is connected with signal conditioning circuit, the output terminal of signal conditioning circuit is connected with the input end of MCU microcontroller chip, the output terminal of MCU microcontroller chip and UWB radio transmitting and receiving chip, the FLASH extended memory connects, the clock chip output terminal links to each other with the MCU microcontroller chip, UWB radio transmitting and receiving chip output terminal is connected with the PCB antenna, micro wind turbine generator is connected with synchronous charge-extraction circuit, the charge-extraction circuit is connected with power module synchronously, power module is connected with the Buck-Boost pressure regulator, Buck-Boost pressure regulator and signal conditioning circuit, the MCU microcontroller chip, the UWB radio transmitting and receiving chip is connected with clock chip.
Described micro wind turbine generator is the miniature piezoelectric aerogenerator based on wind-induced vibration mechanism, and described miniature piezoelectric aerogenerator is comprised of silicon substrate, piezoelectricity composite beam and mass; The piezoelectricity composite beam adopts cantilever beam structure, adopt micro-processing technology that one end is fixed on the silicon substrate, contain multilayer PZT piezoelectric patches in the piezoelectricity composite beam, the upper and lower surface of every one deck PZT piezoelectric patches all has metal electrode to be used to collect electric charge, and wherein the metal electrode between every two-layer PZT piezoelectric patches shares; Mass is positioned at piezoelectricity composite beam free end.
Described aggregation node is made of MCU microcontroller chip, UWB radio transmitting and receiving chip, FLASH extended memory, usb circuit, PCB antenna, clock chip, AC-DC switch power module and low pressure difference linear voltage regulator; The output terminal of MCU microcontroller chip and UWB radio transmitting and receiving chip, FLASH extended memory and usb circuit join, clock chip links to each other with the MCU microcontroller chip, the UWB radio transmitting and receiving chip is connected with the PCB antenna, the AC-DC switch power module output terminal that is connected with alternating current is connected with low pressure difference linear voltage regulator, and low pressure difference linear voltage regulator is connected with clock chip with MCU microcontroller chip, UWB radio transmitting and receiving chip.
Among Fig. 1, the elevator drum stress detection device mainly contains 6 stress wireless senser working nodes, 6 stress wireless senser redundant nodes, elevator drum, aggregation node, USB interface and industrial computers consist of.12 stress wireless senser working nodes and redundant node evenly are fixed on the edge of elevator drum at intervals, and for detection of the stress of cylinder, according to on-the-spot actual needs, the stress wireless sensor node can increase or reduce; Fix an aggregation node at hoister operator's console shell, be used for receiving the stress data of stress wireless senser working node transmission and judging, data are normally then carried out pre-service, send the data to industrial computer by USB interface afterwards, when data exception or working node do not send data, aggregation node then requires to make normal response in the malfunctioning node 5s, otherwise just abandon and open redundant node and replace malfunctioning node to finish detection to the elevator drum stress field; Industrial computer is processed the machine cylinder information of force field that gets a promotion with the information analysis that receives.
Among Fig. 2, be integrated in one based on miniature piezoelectric aerogenerator and the stress wireless senser of wind-induced vibration.The miniature piezoelectric aerogenerator is made of piezoelectricity composite beam, mass and silicon substrate.The piezoelectricity composite beam adopts cantilever beam structure, adopts micro-processing technology that one end is fixed on the silicon substrate.Contain multilayer PZT piezoelectric patches in the piezoelectricity composite beam, be used for the output characteristics of regulator generator internal impedance or raising generator, the upper and lower surface of each layer piezoelectric layer all has metal electrode to be used to collect electric charge, and wherein the metal electrode between every two-layer piezoelectric layer shares.Mass is positioned at the piezoelectric cantilever free end, regulate the frequency of piezoelectricity composite beam, and in wind, form vortex as bluff body, vortex shedding causes the vibration of mass, cause the distortion of piezoelectric cantilever, and then cause the variation of piezoelectricity internal stress and strain, because piezoelectric effect, the electric potential difference that will change between the upper/lower electrode of piezoelectric layer realizes the power supply to lithium ion battery.
In Fig. 3, wireless strain gauge working node and redundant node consist of by micro wind turbine generator, synchronous charge-extraction circuit, Buck-Boost pressure regulator, foil gauge, signal conditioning circuit, MCU microcontroller chip, UWB radio transmitting and receiving chip, FLASH extended memory, PCB antenna, clock chip and power module.Foil gauge consists of by 4, and wherein two for detection of circumferential and radial strain, and two are used for temperature compensation in addition, and four foil gauges consist of full-bridge circuits.Signal conditioning circuit is made of filter amplification circuit, and the voltage signal that full-bridge circuit is exported converts 0-5V standard signal input MCU microcontroller chip to.The MCU microcontroller chip is selected the MSP430F1611 low-power chip, and the integrated 8 Channel 12-Bit A/D converters of this chip internal carry out analog to digital conversion with voltage signal and are stored in the internal RAM.Clock chip is selected X1226, is used for timing wake-up MCU microcontroller chip and gathers stress data.The UWB radio transmitting and receiving chip is selected XS110, and the wireless signal transmission frequency of this chip is 3.1GHz, and traffic rate is 110M/S, is used for the stress data of MCU microcontroller chip collection is sent to aggregation node by the PCB antenna.Adopt the power supply of mixed structure counter stress wireless senser, so that each assembly is had complementary advantages: with the energy source of energy micro wind turbine generator as system, it can export unlimited energy, but underpower is directly to power to wireless senser, and the output power of battery is higher, but therefore the finite energy of storage uses it as the power buffer memory, output power then when needing is constantly accepted electric charge from gatherer At All Other Times.Piezoelectricity aerogenerator, lithium ion battery and stress wireless sensor node have different voltage and current characteristics.Here by batch (-type) trickle synchronous charge-extraction circuit period property ground the electric charge that accumulates on the piezoelectricity aerogenerator is transferred in the lithium ion battery, be embodied as the continuous charging of lithium ion battery.Adopt holding circuit to the carrying out of lithium ion battery put, overcharge and short-circuit protection.Adopt the Buck-Boost pressure regulator to provide stable 3.3V voltage for signal conditioning circuit, MCU microcontroller chip, UWB radio transmitting and receiving chip and clock chip.
In Fig. 4, piezoelectricity aerogenerator based on wind-induced vibration is converted to electric energy with wind energy, by batch (-type) trickle synchronous charge-extraction circuit period property ground the electric charge that accumulates on the piezoelectricity aerogenerator is transferred in the lithium ion battery, be embodied as the continuous charging of lithium ion battery.Adopt holding circuit to the carrying out of lithium ion battery put, overcharge with short-circuit protection and adopt the Buck-Boost pressure regulator to provide stable 3.3V voltage for sensor load.
Fig. 5 is synchronous charge-extraction circuit, and lithium ion battery has different voltage and current characteristics with the stress wireless sensor node.Here by batch (-type) trickle synchronous charge-extraction circuit period property ground the electric charge that accumulates on the piezoelectricity aerogenerator is transferred in the lithium ion battery, be embodied as the continuous charging of lithium ion battery.
Fig. 6 is Buck-Boost regulator circuit schematic diagram, adopt the Buck-Boost pressure regulator to provide stable 3.3V voltage for signal conditioning circuit, MCU microcontroller chip, UWB radio transmitting and receiving chip and clock chip, it is by gate-controlled switch Q, energy storage inductor L, diode D, filter capacitor C, pull-up resistor R
LWith compositions such as control circuits.
Fig. 7 is lithium ionic battery protection circuit; the rated voltage of lithium ion battery is generally 3.7V, stops sparking voltage and is about 2.7V, stops charging voltage and is about 4.2V; surpass the mistake that stops sparking voltage or termination charging voltage and put or overcharge the damage battery, caused the remarkable decline of battery performance.Here adopt holding circuit to the carrying out of lithium ion battery put, overcharge and short-circuit protection.Wherein integrated protective circuit ICR5421 is used for detecting the parameters such as the current voltage of holding circuit, electric current, time and controls the on off state of field effect transistor V1 and V2 with this; Whether field effect transistor V1 and V2 then come to have in the control loop and need open or close according to protection IC; Chip-R is as current limliting; Patch capacitor act as filtering, control lag time; Thermistor is used for detecting the environment temperature in the battery block; It is excessive that fuse prevents from flowing through the electric current of battery, cuts off current return.
In Fig. 8, aggregation node is not owing to needing to detect stress information, so do not have foil gauge and signal conditioning circuit in its structural design.Because aggregation node is in the real-time working state, energy consumption is larger, and its position is convenient to power supply, is its power supply so adopt alternating current.The 220V AC power converts the 5V DC voltage to through AC-DC switch power module AOC_5S, then provides stable 3.3V voltage by low pressure difference linear voltage regulator MAX16999 for peripheral circuit and chip.Remainder is identical with the stress wireless sensor node.
Claims (4)
1. an elevator drum stress field detects and the node energy gathering-device, it is characterized in that, comprises elevator drum, stress wireless senser working node, stress wireless senser redundant node, aggregation node, USB interface and industrial computer; Stress wireless senser working node and redundant node evenly are fixed on the elevator drum at intervals, and aggregation node is fixed on the hoister operator's console shell, and aggregation node links to each other with industrial computer by USB interface.
2. elevator drum stress field according to claim 1 detects and the node energy gathering-device, it is characterized in that described stress wireless senser working node, stress wireless senser redundant node are made of micro wind turbine generator, synchronous charge-extraction circuit, Buck-Boost pressure regulator, foil gauge, signal conditioning circuit, MCU microcontroller chip, UWB radio transmitting and receiving chip, FLASH extended memory, PCB antenna, clock chip and power module; Foil gauge is connected with signal conditioning circuit, the output terminal of signal conditioning circuit is connected with the MCU microcontroller chip, the output terminal of MCU microcontroller chip and UWB radio transmitting and receiving chip, the FLASH extended memory connects, the clock chip output terminal links to each other with the MCU microcontroller chip, UWB radio transmitting and receiving chip output terminal is connected with the PCB antenna, micro wind turbine generator is connected with synchronous charge-extraction circuit, the charge-extraction circuit is connected with power module synchronously, power module is connected with the Buck-Boost pressure regulator, Buck-Boost pressure regulator and signal conditioning circuit, the MCU microcontroller chip, the UWB radio transmitting and receiving chip is connected with clock chip.
3. elevator drum stress field according to claim 1 detects and the node energy gathering-device, it is characterized in that, described aggregation node is by the MCU microcontroller chip, the UWB radio transmitting and receiving chip, the FLASH extended memory, usb circuit, the PCB antenna, clock chip, AC-DC switch power module and low pressure difference linear voltage regulator consist of, the output terminal of MCU microcontroller chip and UWB radio transmitting and receiving chip, FLASH extended memory and usb circuit join, clock chip links to each other with the MCU microcontroller chip, the UWB radio transmitting and receiving chip is connected with the PCB antenna, the AC-DC switch power module output terminal that is connected with alternating current is connected with low pressure difference linear voltage regulator, low pressure difference linear voltage regulator and MCU microcontroller chip, the UWB radio transmitting and receiving chip is connected with clock chip.
4. elevator drum stress field according to claim 2 detects and the node energy gathering-device, it is characterized in that, described micro wind turbine generator is the miniature piezoelectric aerogenerator based on wind-induced vibration mechanism, and described miniature piezoelectric aerogenerator is comprised of silicon substrate, piezoelectricity composite beam and mass; The piezoelectricity composite beam adopts cantilever beam structure, adopt micro-processing technology that one end is fixed on the silicon substrate, contain multilayer PZT piezoelectric patches in the piezoelectricity composite beam, the upper and lower surface of every one deck PZT piezoelectric patches all has metal electrode to be used to collect electric charge, and wherein the metal electrode between every two-layer PZT piezoelectric patches shares; Mass is positioned at piezoelectricity composite beam free end.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205474299U CN202853813U (en) | 2012-10-24 | 2012-10-24 | Elevator roller stress field detection and node energy collection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012205474299U CN202853813U (en) | 2012-10-24 | 2012-10-24 | Elevator roller stress field detection and node energy collection device |
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| CN202853813U true CN202853813U (en) | 2013-04-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103217235A (en) * | 2012-10-24 | 2013-07-24 | 中国矿业大学 | Device and method for promoting stress field detection and node energy collection of expansion cylinder of elevator |
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2012
- 2012-10-24 CN CN2012205474299U patent/CN202853813U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103217235A (en) * | 2012-10-24 | 2013-07-24 | 中国矿业大学 | Device and method for promoting stress field detection and node energy collection of expansion cylinder of elevator |
| CN103217235B (en) * | 2012-10-24 | 2015-04-01 | 中国矿业大学 | Device and method for promoting stress field detection and node energy collection of expansion cylinder of elevator |
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