CN108760362A - A kind of the elevator row checking device and elevator detecting system of integrated leveling error detection - Google Patents
A kind of the elevator row checking device and elevator detecting system of integrated leveling error detection Download PDFInfo
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- CN108760362A CN108760362A CN201810337444.2A CN201810337444A CN108760362A CN 108760362 A CN108760362 A CN 108760362A CN 201810337444 A CN201810337444 A CN 201810337444A CN 108760362 A CN108760362 A CN 108760362A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
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Abstract
The present invention relates to a kind of elevator row detection devices of integrated leveling error detection and elevator detecting system, the elevator row detection device to include：Leveling error acquisition module, elevator information acquisition module, first communication module, processor module and power management module, the leveling error acquisition module are used to measure the leveling error of elevator；The elevator information acquisition module is used to acquire the parameter information of elevator, the first communication module is used to establish with background server and connect, the data of leveling error acquisition module and the acquisition of elevator information acquisition module are transmitted, and receive the data that background server is sent.The beneficial effects of the practice of the present invention is, the automatic of result is simultaneously uploaded to background server by the multinomial elevator information of elevator row checking device automatic collection, improve the objective and accurate property that elevator safety is examined, reduce the labor intensity of reviewer, and substantially shorten the field test time, improve the efficiency that elevator is examined.
Description
Technical field
The invention patent relates to a kind of the elevator row checking devices and elevator detecting system of integrated leveling error detection, belong to electricity
Terraced detection technique field.
Background technology
With domestic elevator manufacturing enterprise flourish and high-rise emerging in large numbers like the mushrooms after rain especially, elevator
Thousand users are come into.Elevator is closely related with daily life, but its safety hazards take place frequently also give people with
Carry out fear, reinforces the inspection of elevator to safeguarding that elevator safety aspect plays an important role.However in China, elevator is determined
Phase is examined still based on artificial detection, and a large amount of detecting instruments, such as vernier caliper, sound level meter, illumination meter are carried by reviewer
On-the-spot test, testing result is gone to be recorded in papery report, go back to be input in server again, detecting step is cumbersome, and time-consuming
And the artificial data that read can cause reading to have deviation, it is more difficult to the safe condition of accurate judgement elevator.
Particularly, detection of the row checking device of current elevator all without integrating Elevator landing error.The leveling error of elevator
When referring to car stop, distance value of the plane between plane on landing sill in vertical direction on sill, the flat bed of elevator
The comfort level of accuracy and operation has much relations with stationarity.But the measurement range of Elevator landing error is small, it is desirable that precision is high,
And the reason of because of elevator structure, it has not been convenient to measure.The tool of Elevator landing error measure at present measures still based on vernier caliper
It is very inconvenient.
Invention content
Technical problem to be solved by the invention is to provide a kind of the elevator row checking devices and electricity of integrated leveling error detection
Terraced detecting system.
In order to solve the above-mentioned technical problem the present invention uses following technical scheme：
A kind of elevator row checking device of integrated leveling error detection includes：Leveling error acquisition module, elevator information acquisition
Module, first communication module, processor module and power management module；The leveling error acquisition module is for measuring elevator
Leveling error；
The elevator information acquisition module is used to acquire the parameter information of elevator, including the temperature value of car, humidity value, light
According to value, traction machine three-phase voltage, current value and elevator attribute information；
The first communication module is used to establish with background server and connect, and transmits leveling error acquisition module and elevator letter
The data of acquisition module acquisition are ceased, and receive the data that background server is sent；
The processor module controls other modules operation of elevator row checking device for providing data-interface；
The power management module is used to provide power supply to the elevator row detection device.
As a preferred technical solution of the present invention：Leveling error acquisition module is based on using ultrasonic distance-measuring sensor
The contactless measurement of difference in height measures the vertical range of the car ground level and respective layer ground level when elevator arrives at a station.
As a preferred technical solution of the present invention：The ultrasonic distance-measuring sensor is mounted on elevator row checking device
Dorsal edge, and make ultrasonic wave delivery header and receive head perpendicular alignmnet car ground.
As a preferred technical solution of the present invention：The elevator information acquisition module include Temperature and Humidity module,
Illumination detection module, barcode scanning module and traction machine three-phase voltage current detection module；Temperature and Humidity module is passed by humiture
Sensor acquires temperature, humidity in car；Light intensity sensor is combined by illumination detection module with distance measuring sensor, detects car
With the intensity of illumination under different height in elevator(lift) machine room；Barcode scanning module is for scanning the bar code of elevator to obtain the attribute of elevator
Information, including manufacture information, model and service life；Traction machine three-phase voltage current detection module by RS485 interfaces with
Processor is connected, traction machine three-phase voltage, current data in acquisition running process of elevator.
As a preferred technical solution of the present invention：Described device further includes：The power management module includes battery
Charging circuit, power supply switch circuit, electricity monitoring circuit and voltage conversion circuit；The charging circuit is that battery is filled
Electricity, and charge protection is provided；The power supply switch circuit be used for when external direct current power supply system power supply input switch to it is external
Power supply；Electricity monitoring circuit is used to read the remaining capacity of lithium battery；Voltage conversion circuit is to convert core by LDO or DC-DC
Lithium battery voltage is converted into the supply voltage of system needs by piece.
As a preferred technical solution of the present invention：Described device further includes human-computer interaction module, man-machine for providing
Interactive interface receives detection control instruction.
As a preferred technical solution of the present invention：Described device is handheld device.
The present invention also proposes that a kind of elevator detecting system, the elevator detecting system include elevator row detection device, acquisition
Device and background server；The collector is used to acquire the vibration information and noise information in running process of elevator；It is described
Background server is used to receive the data from elevator detection scene, and storage and maintenance data.
As a preferred technical solution of the present invention：The elevator row checking device further includes being connected with processor module
Second communication module, the second communication module establish bluetooth connection, elevator row for the elevator row checking device with collector
Checking device obtains the vibration information and noise information when the elevator operation of collector acquisition based on the bluetooth connection.
A kind of elevator row detection device of integrated leveling error detection of the present invention, is integrated with the leveling error inspection of elevator
Module is surveyed, car ground level when elevator arrives at a station is measured with respective layer by ultrasonic distance-measuring sensor based on difference in height principle
The vertical range of plane, it is convenient to measure, high certainty of measurement；Elevator detecting system of the present invention, using it is advanced it is embedded,
Detection and the communication technology realize the automatic collection and remote transmission of elevator safety detection field data, after the completion of detection, electricity
Terraced row checking device is docked with background server, automatic uploading detection data, and quickly judgement is detected the safety of elevator, to improve electricity
The objective and accurate property of terraced safety examination reduces the labor intensity of reviewer, and substantially shortens the field test time, improves inspection
The efficiency tested.
Description of the drawings
Fig. 1 is the system block diagram of elevator row checking device；
Fig. 2 is the schematic diagram of Elevator landing error measure；
Fig. 3 is the interface circuit schematic diagram of the capacitance touch screen of elevator row checking device；
Fig. 4 is that RS485 of the elevator row checking device for traction machine measure voltage & current turns TTL circuit diagrams；
Fig. 5 (a) (b) (c) is the GPRS communication module circuitry schematic diagrams that elevator row checking device is used to send gathered data；
Fig. 6 is elevator row checking device power management module schematic diagram；
Fig. 7 is elevator row checking device lithium battery charging chip AP5056 circuit diagrams；
Fig. 8 is elevator detecting system block diagram.
Specific implementation mode
Below in conjunction with the drawings and specific embodiments in patent of the present invention, to the technology in patent Example of the present invention
Scheme is clearly and completely described.
As shown in Figure 1, the present embodiment provides a kind of elevator row checking device of integrated leveling error detection, which is hand-held
Equipment is integrated with leveling error detection module 106 using lithium battery power supply, further includes processor module 102, power management mould
Block 101, data memory module 110, human-computer interaction module 103, first communication module 109, second communication module 111 and elevator
Each module of information collection.In patent of the present invention, elevator information acquisition module 100 includes Temperature and Humidity module 104, illumination inspection
Survey module 105, barcode scanning module 107 and traction machine three-phase voltage current detection module 108.
The leveling error of elevator is not easy directly to measure, and the leveling error height of general elevator is less than 30mm, measurement range
It is short, it is desirable that precision is high, therefore proposes the contactless measurement based on difference in height, selects high-precision ultrasonic transducer conduct
Survey tool.The operation principle of ultrasonic sensor is to send out ultrasonic wave by ultrasonic transmission device, in transmitting ultrasound
Start timing while the wave moment, ultrasonic wave is propagated by air, and propagation encounters barrier on the way will reflect biography immediately
It broadcasts back, ultrasonic probe, ultrasonic receiver stops timing immediately at the time of receiving back wave, and ultrasonic wave is calculated by the propagation time
Distance of the sensor to barrier.As shown in Fig. 2, elevator detection case is for storing elevator row checking device and collector and electricity
The suitcase of source line, in the present embodiment, suitcase volume are 480mm*355mm*145mm, when carrying out elevator detection, detection
Personnel carry the detection case to scene, open detection case taking-up row checking device and collector works, wherein row checking device is taken
What is operated on hand, and collector (being not shown in Fig. 2) is placed on the first-class personnel's instruction to be detected in car ground.Row checking device is
It is designed to the handheld terminal of straight-plate-type fuselage, is convenient for carrying and operates, capacitance touch screen is expert at checking device front as man-machine friendship
Mutual interface, for checking testing result and selection operation content, communication interface and sensor interface installation are expert at the four of checking device
It week is convenient for measuring and plugs, wherein ultrasonic sensor installs the checking device back side of being expert at, and ultrasonic wave delivery header is vertical with head is received
It is directed at car ground.Because leveling error measurement range is too small, it is not easy directly to measure, therefore increases a stand-off for sensor
From, by within the scope of extended detection range to sensor measurement, this reference recording be elevator detection case height (for example,
145mm), when carrying out leveling error measurement, by row checking device face-up be positioned over detection babinet on, the row checking device back side with
Corresponding movable clamp groove connection on babinet, the position of fixed row checking device are detected, the mouth of ultrasonic sensor detection at this time can be stretched
Go out babinet, the vertical range of detection sensor to ground.The detailed process of detection is that detection babinet is placed on elevator car first
In compartment, the distance of measurement sensor to car ground detects the height of babinet, is denoted as reference distance；Then by row checking device
It is moved at elevator door with babinet, ultrasonic sensor stretches out elevator door, is directed at respective layer ground, again measurement sensor to ground
The difference of the distance in face, this distance and a reference value is leveling error.Leveling error be it is positive indicate car ground level higher than pair
A layer ground is answered, is less than respective layer ground if negative indication car ground level.The leveling error detection module 106 of elevator is selected high-precision
Ultrasonic distance-measuring sensor KS103 is spent, measurement range is 1cm~3m, and highest measurement precision is up to 1mm.Sensor supply voltage
For 5V, pass through IIC interfaces and processor communication.
STM32F429 processor chips of the elevator processor module 102 based on ST companies realize that the processor is based on
Cortex-M4 kernels, highest dominant frequency possess abundant Peripheral Interface up to 180MHz, and also TFT-LCD controllers and quickening is schemed
The accelerator of shape process performance is equipped with embedded graphic software stack STemwin, it can be achieved that abundant human-computer interaction interface.And
Processor minimum consumption electric current under low-power consumption mode is only 2.2uA, is suitble to the application of row checking device.
Elevator row checking device human-computer interaction module 103 uses 4.3 inch capacitance touch screens, capacitance plate to be carried out using human body sensing
Contact detection control, it is only necessary to gentle touchdown, so that it may to position touch coordinate by induced current.The capacitance screen is differentiated
Rate is 800*480, and by dual power supply, 3.3V power supplys are powered to capacitance plate driving chip, and 5V powers to screen backlight.Screen
Driving chip is NT35510, which carries image register, need not separately add driver, pass through 8,080 16 parallel busses
It is connected with processor, color data is stored using RGB565 formats, processor only needs the instruction that read-write register is arranged, write-in
Coordinate and color can show the color data needed in screen corresponding position.Capacitance touch driving chip is selected
OTT2001A is connected by IIC interfaces with processor, can be obtained by the status register and coordinate registers of inquiring chip
Contact coordinate.Capacitance touch screen interface circuit is as shown in Figure 3.
The humiture module 104 of elevator is used to acquire the humiture information of car, selects AM2302 humiture modules, temperature
Measurement range is -40 DEG C~80 DEG C, and measurement accuracy is 0.5 DEG C, moisture measurement ranging from 0~100%RH, measurement accuracy 2%
RH.Probe power input is 3.3V, is connected with processor by monobus, external about 5.1k Ω's is upper on the data line
Pull-up resistor ensures when the data line free time to be in high level, consistent with monobus sequential.
The illumination acquisition module 105 of elevator is used to detect the light intensity in car with different height in computer room, selects 16 digits
Font light intensity sensor BH1750FVI, acquisition range are 1~65535lx.Probe power input is 3.3V, passes through iic bus
It is connected with processor, directly acquires the digital value of corresponding brightness.When detection, optical sensor is used in combination with distance measuring sensor,
Measure the corresponding intensity of illumination of different height.
The traction machine voltage and current measurement module 107 of elevator is detected using phase mutual inductance type circuit acquisition module, should
Sensor assembly voltage measurement range is 380V, and current measurement range is 50A, is exported by RS485 buses and is tested voltage and current
Virtual value.Processor reads testing result by 485 communication chip ADM2485, which mainly completes RS485 differential signals
Conversion between Transistor-Transistor Logic level, such processor can directly read 485 data by serial ports 2.As shown in figure 4,12 foot of chip
It is 485 differential signal inputs with 13 feet, the build-out resistor that 120R is added reduces the reflection of signal on the line.3 feet and 6 feet with
The serial ports 2 of processor is connected, and 7 feet are Power Supply Monitoring foot, and when supply voltage is less than 2.0V, chip is stopped.Because
ADM2485 is 485 isolating chips, and isolated from power chip B0505-1W is selected to provide 5V voltages for chip both ends power supply, power supply every
Ionization voltage is 2500V, and both ends power supply altogether, does not avoid the influence of power-supply fluctuation or static discharge to communication port.Voltage and current
Acquisition module carries out data interaction using Modbus-RTU communication formats and processor.
The bar code of elevator is generally attached on lift door frame, including the information such as the number of elevator, specification, the date of production.
The embedded barcode scanning module 107 of row checking device is used to scan the bar code data of elevator, the bar shaped for being obtained parsing by serial ports 1
Code data are transferred to processor.
The communication module of elevator row checking device includes the first communication module 109 and the second communication module 111.Wherein, first
Communication module 109 realizes GPRS functions, is realized based on SIM900A, embeds ICP/IP protocol, by the way that AT is arranged (i.e.
Attention) instruction carries out data transmission.Fig. 5 (a) is the core circuit of SIM900A communication modules, and main includes power supply electricity
Road, reset circuit and antenna circuit, SIM900A are connected by serial ports 3 with processor, because the serial ports level of module is
2.8V, and processor interface level is 3.3V, needs to add triode electrical level matching circuit therebetween, such as Fig. 5 (b) institutes
Show；GPRS is for when communicating, accessing network operator by SIM card, selecting the SIM card of 6 feet to be connect with SIM900A modules, such as
Shown in Fig. 5 (c).Second communication module 111 is based on low-power consumption bluetooth chip CC2541 and realizes, is connected with controller by serial ports 4,
Control the data interaction of bluetooth completion and collector.After the completion of elevator detection, all gathered datas are packaged by processor
JSON formats, JSON (JavaScript Object Notation) format is a kind of data interchange format of lightweight, is " name
Title/value " to set, facilitate server to explain.In one's own profession checking device, by the bar code data of elevator, the warm and humid number of degrees
According to photometric data, voltage and current data, vibration data and noise data are packaged into JSON formats, are passed by GPRS communication modules
It is defeated by background server.
Power management module is by taking lithium battery power supply as an example in embodiments of the present invention, as shown in fig. 6, lithium battery source control
Circuit includes lithium battery charging circuit, electric quantity monitoring circuit, power supply switch circuit and voltage conversion circuit.Lithium battery charging chip
AP5056 is used, as shown in fig. 7, chip AP5056 uses constant voltage constant current charging mode, prevents from overcharging lithium battery, passes through 2 feet
The charging current that the feedback resistance setting chip of connection exports is 500mA.6 feet and the LED of 7 feet connection are used to indicate current fill
Electricity condition, 7 feet set height, and 6 feet set low expression currently in charging, otherwise indicate that charging is completed.Processor is adopted by AD in piece
Collect lithium battery voltage and monitor electric quantity of lithium battery, cell voltage is in certain correspondence with electricity, therefore storage pair in memory
Relation table is answered to obtain current battery dump energy by look-up table.When electric quantity of lithium battery is too low, pass through external direct current power supply
It charges the battery.System power supply is switched to by external power supply by PMOS tube when charging, ensures that system power supply is drawn from lithium battery
Electric current is 0, improves the speed of charging.Lithium battery voltage is 3.7V, cannot use directly to subsequent module, be converted by DC-DC
Chip FP5056 is converted into 5V, and LDO chips ASM1117-3.3 is converted into 3.3V.The Enable Pin of power supply conversion and control chip and place
Manage device I/O port be connected, when external connection module when not in use, corresponding power supply chip is switched to low work(by the power input of closedown module
Consumption pattern.When row checking device does not have task execution for a period of time, the external I/O port of processor is closed, processor host frequency is reduced,
It is switched to the low-power consumption mode of STM32, extends the stand-by time of row checking device.
In conclusion the elevator row checking device for implementing a kind of integrated leveling error detection proposed by the present invention has following effect
Fruit：
(1) the row checking device application detection technique, the humiture of automatic collection elevator, illumination, leveling error and is draged
Draw electromechanical piezoelectricity stream information, avoids the error-prone property for manually reading and operating, improve detection efficiency；Handheld device be convenient for carrying and
It is easy to operate, detection data is shown by capacitance plate, detection present situation is intuitively understood convenient for testing staff, reduces testing staff's
Labor intensity.
(2) it applies difference in height principle to detect the leveling error of elevator by high-precision ultrasonic transducer, solves at present
The problem of leveling error information is not easy to obtain, accuracy of detection is high, convenient and efficient；
As shown in figure 8, elevator detecting system includes elevator 10, elevator row checking device 20, collector 30 and background server
40.Collector 30 is placed on lift car ground, for acquiring vibration information and noise information in running process of elevator.Afterwards
Platform server 40 is responsible for completing processing, storage and maintenance work to all detection datas from elevator on-site.Elevator row is examined
Device 20 grasps entire inspection process as the interface of human-computer interaction, works for controlling collector 30, is contact background service
The relaying of device 40 and collector 30.When elevator row checking device 20 by the selection of capacitance touch screen 103 for when detecting, needing to detect
Project, receive 30 detection data of collector that comes of Bluetooth feedback, data be packaged after the completion of detection, mould is communicated by GPRS
Block 109 is sent on background server 40.
Wherein, the elevator row checking device embodiment in the elevator detecting system is same as above, and details are not described herein.
It is had the advantages that in conclusion implementing elevator detecting system proposed by the present invention：
(1) elevator row checking device application detection technique, the humiture of automatic collection elevator, illumination, leveling error and is draged
Draw electromechanical piezoelectricity stream information, avoids the error-prone property for manually reading and operating, improve detection efficiency；Handheld device be convenient for carrying and
It is easy to operate, detection data is shown by capacitance plate, detection present situation is intuitively understood convenient for testing staff, reduces testing staff's
Labor intensity；
(2) it applies difference in height principle to detect the leveling error of elevator by high-precision ultrasonic transducer, solves at present
The problem of leveling error information is not easy to obtain, accuracy of detection is high, convenient and efficient；
(3) detection device is connected by GPRS communication modules with background server, realizes the automatic upload of gathered data
Function avoids the cumbersome of manual entry data, and the elevator current state that energy quick obtaining server analysis obtains
Any process described otherwise above or method description can be by flow chart or in an embodiment of the present invention
It is interpreted as, expression includes the steps that one or more codes for realizing specific logical function or the executable instruction of process
Module, segment or part, and the range of embodiment of the present invention includes other realization, wherein can not press it is shown or
The sequence of discussion, include according to involved function by it is basic simultaneously in the way of or in the opposite order, to execute function, this is answered
By the embodiment of the present invention, the technical personnel in the technical field understand.
For illustrative purposes, the description of front has used specific term, to provide a thorough understanding of the present invention.So
And it will be apparent to those skilled in the art that not needing to concrete details to put into practice the present invention.The present invention
The foregoing description of specific embodiment be to present for purposes of illustration and description.They are not intended in detail or send out this
It is bright to be limited to disclosed precise forms.In view of religious doctrine above, many modifications and variations are possible.In order to best explain this
The principle and its practical application of invention and these embodiments have shown and described, to enable others skilled in the art
Best using the present invention and with the various embodiments suitable for the expected specific various modifications used.It is intended to the model of the present invention
It encloses and is limited by following claims and its equivalent.
Claims (9)
1. a kind of elevator row checking device of integrated leveling error detection, which is characterized in that described device includes：Leveling error acquires
Module, elevator information acquisition module, first communication module, processor module and power management module；The leveling error is adopted
Collection module is used to measure the leveling error of elevator；
The elevator information acquisition module is used to acquire the parameter information of elevator, including the temperature value of car, humidity value, illumination
Value, traction machine three-phase voltage, current value and elevator attribute information；
The first communication module is used to establish with background server and connect, and transmits leveling error acquisition module and elevator information is adopted
Collect the data of module acquisition, and receives the data that background server is sent；
The processor module is used for other modules to elevator row checking device and provides data-interface, and controls the operation of other modules；
The power management module is used to provide power supply to the elevator row detection device.
2. a kind of elevator row checking device of integrated leveling error detection according to claim 1, which is characterized in that the flat bed
Error acquisition module is measured using contactless measurement of the ultrasonic distance-measuring sensor based on difference in height when elevator arrives at a station
The vertical range of car ground level and respective layer ground level.
3. a kind of elevator row checking device of integrated leveling error detection according to claim 2, which is characterized in that the ultrasound
Wave distance measuring sensor is mounted on the dorsal edge of elevator row checking device, and makes ultrasonic wave delivery header and receive head perpendicular alignmnet car
Ground.
4. a kind of elevator row checking device of integrated leveling error detection according to claim 1, which is characterized in that the elevator
Information acquisition module includes Temperature and Humidity module, illumination detection module, barcode scanning module and the detection of traction machine three-phase voltage current
Module；Temperature and Humidity module acquires temperature, humidity in car by Temperature Humidity Sensor；Illumination detection module passes light intensity
Sensor is combined with distance measuring sensor, detection car and the intensity of illumination under different height in elevator(lift) machine room；Barcode scanning module is used for
The bar code of elevator is scanned to obtain the attribute information of elevator, including manufacture information, model and service life；Traction machine three-phase
Measure voltage & is connected by RS485 interfaces with processor, obtain running process of elevator in traction machine three-phase voltage,
Current data.
5. a kind of elevator row checking device of integrated leveling error detection according to claim 1, it is characterised in that：The power supply
Management module includes battery charger, power supply switch circuit, electricity monitoring circuit and voltage conversion circuit；The charging electricity
Road is that battery charges, and provides charge protection；The power supply switch circuit is used for the system power supply when external direct current power supply
Input switches to external power supply；Electricity monitoring circuit is used to read the remaining capacity of lithium battery；Voltage conversion circuit is to pass through LDO
Or lithium battery voltage is converted into the supply voltage of system needs by DC-DC conversion chips.
6. a kind of elevator row checking device of integrated leveling error detection according to claim 1, it is characterised in that：Described device
Further include human-computer interaction module, for providing human-computer interaction interface, receives detection control instruction.
7. a kind of elevator row checking device of integrated leveling error detection according to claim 1, it is characterised in that：Described device
It is handheld device.
8. a kind of elevator detecting system, which is characterized in that the elevator detecting system includes collector, background server and such as
Any one of the claim 1-7 elevator row checking devices；The collector is used to acquire the vibration information in running process of elevator
And noise information；The background server is used to receive the data from elevator detection scene, and storage and maintenance data.
9. elevator detecting system according to claim 8, it is characterised in that：The elevator row checking device further includes and processor
The connected second communication module of module, the second communication module establish bluetooth company for the elevator row checking device and collector
It connects, the vibration information and noise when elevator row checking device obtains the elevator operation of collector acquisition based on the bluetooth connection are believed
Breath.
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| CN201810337444.2A CN108760362A (en) | 2018-04-16 | 2018-04-16 | A kind of the elevator row checking device and elevator detecting system of integrated leveling error detection |
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| CN111521865A (en) * | 2020-05-28 | 2020-08-11 | 深圳市通用互联科技有限责任公司 | Voltage monitoring system |
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