CN109142910A - A kind of elevator door-motor condition monitoring system and method - Google Patents
A kind of elevator door-motor condition monitoring system and method Download PDFInfo
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- CN109142910A CN109142910A CN201810756303.4A CN201810756303A CN109142910A CN 109142910 A CN109142910 A CN 109142910A CN 201810756303 A CN201810756303 A CN 201810756303A CN 109142910 A CN109142910 A CN 109142910A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
Abstract
The invention provides a kind of elevator door-motor condition monitoring system and method, including signal capture device, envelope eapsulotomy circuit, processing unit and communication unit, signal capture device is used to acquire the electric signal of element in elevator door-motor, envelope eapsulotomy circuit is for carrying out integration processing to the electric signal captured, for the electric signal after envelope eapsulotomy processing of circuit to be compared with preset value, communication unit is used to comparison result information being sent to host computer processing unit；Signal capture device, envelope eapsulotomy circuit, processing unit and communication unit are sequentially electrically connected, and communication unit sends testing result by wireless signal.Door machine condition monitoring system described in the invention can obtain door machine status information by simple route under the premise of not adding additional monitoring device.
Description
Technical field
The invention belongs to technical field of elevator equipment, more particularly, to a kind of elevator door-motor condition monitoring system and side
Method.
Background technique
Further perfect with Urbanization in China, people are more and more using the number of elevator.Although elevator side
People's lives, but also brought security risk, only for 2016, elevator accident 48 occurs altogether for the whole nation
It rises, causes 41 people dead and 20 people injury, elevator safety become the focus of attention of public opinion and society.
For guarantee ladder personnel safety, cope with elevator in each component be monitored, in its operation irregularity in time into
Row information feedback.Major mechanical structure one of of the elevator door-motor as elevator interior, is chronically at motion state, internal mechanical
Construction can generate abrasion condition, and at the same time, the sensor frequency of use for detecting elevator door-motor switch state is higher, be easy to happen
Once elevator door-motor operating status is abnormal elevator accident easily occurs for failure.Door status sensor is relied in existing elevator mostly
Or travel switch judges the folding condition of elevator door, needs additionally to install biography in the end face of elevator door using door status sensor
Sensor；The generation of elevator status data can be judged by accident due to its included mechanical structure breaks down using travel switch.
Summary of the invention
In view of this, the invention is directed to a kind of elevator door-motor condition monitoring system and method, utilized with realizing
Original elevator components realize the purpose being monitored to elevator door-motor state.
In order to achieve the above objectives, the technical solution of the invention is achieved in that
A kind of elevator door-motor condition monitoring system, comprising: signal capture device, envelope eapsulotomy circuit, processing unit and communication
Unit；The signal capture device is used for for acquiring element current in elevator door-motor, the envelope eapsulotomy circuit to signal capture
The electric signal of device output carries out fidelity processing, and the processing unit is used for the electric signal after envelope eapsulotomy processing of circuit and presets
Value is compared, and the communication unit is used to comparison result being sent to host computer；The output end and letter of the signal capture device
The input terminal electrical connection of number fidelity circuit, the output end of envelope eapsulotomy circuit be electrically connecteds with the input terminal of processing unit, and processing is singly
The output end of member is electrically connected with the input terminal of communication unit.
Further, the envelope eapsulotomy circuit includes:
First processing module, input terminal are connected with the output end of signal capture device, to stablize the telecommunications number of access
Value；
Second processing module, input terminal are connected with the output end of first processing module, for further being promoted at first
Electric signal precision after managing resume module；
Buffer module, input terminal are connected with the output end of Second processing module, for the output to Second processing module
Signal is buffered；
Reference signal module, output end are connected with the input terminal of Second processing module, for mentioning to envelope eapsulotomy circuit
Signal for reference.
Further, the envelope eapsulotomy circuit further includes preposition earthing module, the input terminal of the preposition earthing module
It is connected with the input terminal of first processing module, to prevent envelope eapsulotomy circuit to be saturated.
Further, the first processing module includes first resistor and the first operational amplifier；Second processing module packet
Include 3rd resistor and second operational amplifier；Buffer module includes the 5th resistance, the 6th resistance and the second grounding ports；With reference to letter
Number module includes the 4th resistance and reference voltage port；Preposition earthing module includes second resistance and the first grounding ports；
The first end of the output end connection first resistor of the signal capture device, the first fortune of second end connection of first resistor
The positive input of amplifier is calculated, the output end of first operational amplifier connects the reverse input end of itself, constitutes negative anti-
Current feed circuit；
The first end of the 3rd resistor connects the output end of the first operational amplifier, and second end connects the second operation amplifier
The positive input of device, the output end of the second operational amplifier connect the reverse input end of itself, constitute negative-feedback circuit；
The output end of the first end connection second operational amplifier of 5th resistance, second end connect the defeated of processing unit
Enter end；
The positive input of one end connection second operational amplifier of 4th resistance, second end connection reference voltage connect
Mouthful；
The first end of the first end connection first resistor of the second resistance, the first ground connection of second end connection of second resistance
Port, the first grounding ports ground connection；
The first end of 6th resistance connects the second end of the 5th resistance, the second ground connection of second end connection of the 6th resistance
Port, the second grounding ports ground connection.
Further, the signal capture device is the first leakage current sensor being mounted on door machine sensor, described
Current information of one leakage current sensor to capture door machine opening and closing movement.
Further, the signal capture device further includes the second leakage current sensor being mounted on door machine motor, institute
The second leakage current sensor is stated to capture electric motor operation electric current.
Further, the processing unit is micro-control unit or comparator.
Further, the communication unit is that MTK-MT7681 wireless communication module or high pass MSM8916-4G communicate mould
Block.
Further, a kind of operating method of elevator door-motor condition monitoring system is as follows:
Door machine sensor internal electric signal of the elevator door-motor in enabling extreme position and shutdown extreme position is recorded, is denoted as
A1 and a2；The electric signal of door machine motor in normal work is recorded, b1 is denoted as；
Signal capture device collects the real-time working electric signal of counter element, and the signal that the first leakage current sensor captures is denoted as
C1, the signal that the second leakage current sensor captures are denoted as c2；
C1 and c2 input signal fidelity circuit is subjected to fidelity processing, it will treated c11 and c21 input processing unit；
Processing unit compares c11 and a1, a2, and c21 and b1 are compared；
Elevator door-motor is in enabling extreme position at this time if c11=a1, if elevator door-motor is in pass to c11=a2 at this time
Gate pole extreme position, the electric motor normal working at this time if c12=b1, if c12=0 motor stall at this time；
The comparing result of processing unit is sent to host computer by communication unit.
Compared with the existing technology, a kind of elevator door-motor condition monitoring system and method described in the invention have following
Advantage:
A kind of elevator door-motor condition monitoring system described in the invention can pass through the structure of advantages of simple and collect electricity
The real-time status of terraced door machine avoids additionally installing monitoring device；The invention utilizes the security component in door machine --- electric leakage
Flow sensor carries out signal acquisition, avoids additionally installing signal collecting device, is suitable for most of elevator.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide to further understand the invention, present invention wound
The illustrative embodiments and their description made are used to explain the present invention creation, do not constitute the improper restriction to the invention.?
In attached drawing:
Fig. 1 is the envelope eapsulotomy electrical block diagram of the invention；
Fig. 2 is the circuit diagram of the envelope eapsulotomy circuit in the invention embodiment；
Fig. 3 is the same phase dc amplifier schematic diagram in the invention embodiment.
Description of symbols:
11- first processing module；12- Second processing module；13- buffer module；14- reference signal module；15- is preposition to be connect
Ground module；101- second resistance；102- first resistor；103- 3rd resistor；The 4th resistance of 104-；The 5th resistance of 105-；106-
6th resistance；The first operational amplifier of 111-；112- second operational amplifier；121- reference voltage interface.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the invention can
To be combined with each other.
In the description of the invention, it is to be understood that term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description the invention and simplifies description, rather than indicate
Or imply that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot understand
For the limitation to the invention.In addition, term " first ", " second " etc. are used for description purposes only, and should not be understood as indicating
Or it implies relative importance or implicitly indicates the quantity of indicated technical characteristic." first ", " second " etc. are defined as a result,
Feature can explicitly or implicitly include one or more of the features.In the description of the invention, unless separately
It is described, the meaning of " plurality " is two or more.
In the description of the invention, it should be noted that unless otherwise clearly defined and limited, term " peace
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, on being understood by concrete condition
State concrete meaning of the term in the invention.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments creates.
Elevator door-motor is also referred to as door lifter, is the opening and closing device of elevator cab door, when elevator receives open and close gate signal
The torque that door machine motor generates is changed into the power of a specific direction, and elevator door-motor realization is made to open or close movement.To elevator
The motion state of door machine is monitored the instantaneous operating conditions that will appreciate that elevator, while also can be timely when door machine breaks down
Reply processing.
The monitoring of elevator door-motor state is usually realized by door status sensor or travel switch at this stage, but both
Method, which requires the monitoring device installing additional equipment, smaller scope of application in door machine, while additionally adding, to be gone out
Existing failure, and unnecessary interference information is introduced for the monitoring of door machine state.
The present invention proposes a kind of elevator door-motor condition monitoring system, realizes elevator door-motor by component original inside door machine
Status monitoring.
A kind of elevator door-motor condition monitoring system, comprising: signal capture device, envelope eapsulotomy circuit, processing unit and communication
Unit.
The output end of signal capture device is electrically connected with the input terminal of envelope eapsulotomy circuit, the output end of envelope eapsulotomy circuit with
The input terminal of processing unit is electrically connected, and the output end of processing unit is electrically connected with the input terminal of communication unit.
Signal capture device is used to export signal capture device for acquiring element current in elevator door-motor, envelope eapsulotomy circuit
Electric signal carry out fidelity processing, processing unit is for comparing the electric signal after envelope eapsulotomy processing of circuit with preset value
Right, communication unit is used to comparison result being sent to host computer.
It should be noted that envelope eapsulotomy circuit after receiving the electric signal in signal capture device, carries out the signal
It follows, buffer and is filtered, reduce the error generated during electric signal transmission.
In the present embodiment, signal capture device is original leakage current sensor inside door machine.
Leakage current sensor is a kind of according to device made of mutual inductance phenomenon and magnetic modulation principle, can be cross, straight by what is be tested
The DC current or DC voltage of flow pattern micro-current isolation conversion linearly.The leakage current sensor in existing elevator door-motor
Usually as safety attachment, it is sleeved in the positive and negative outlet of each sensor.When the failure of the wire insulation of sensor, electric leakage is spread
Sensor detects the electric current escaped and is translated into voltage signal, is sent to host computer and alarms.
Signal capture device includes on the first leakage current sensor and door machine motor on door machine sensor in the present embodiment
The second leakage current sensor.
It should be noted that the first leakage current sensor is used to capture the operating current of door machine sensor internal, the second leakage
Current sensor is used to capture the operating current of door machine motor interior；Leakage current sensor converts the current signal captured
For voltage signal, supplies envelope eapsulotomy circuit and use.
As shown in Figure 1, for the structural schematic diagram of envelope eapsulotomy circuit in the present embodiment, envelope eapsulotomy circuit includes:
First processing module 11, input terminal are connected with the output end of signal capture device, to stablize the electric signal of access
Numerical value；
Second processing module 12, input terminal are connected with the output end of first processing module 11, for further promoting the
One processing module 11 treated electric signal precision；
Buffer module 13, input terminal are connected with the output end of Second processing module 12, for Second processing module 12
Output signal buffered；
Reference signal module 14, output end are connected with the input terminal of Second processing module 12, for electric to envelope eapsulotomy
Road provides reference signal；
The input terminal of preposition earthing module 15 is connected with the input terminal of first processing module 11, for preventing envelope eapsulotomy electric
Road saturation.
It should be noted that first processing module 11 is common-collector circuit.Signal is inputted from base stage, emitter-base bandgap grading output, therefore
Also known as emitter-follower.Its base voltage is identical as collector voltage phase, i.e. input voltage and the same phase of output voltage, that is,
The voltage amplification factor perseverance of voltage follower is less than and close to 1.
Illustratively, it is illustrated in figure 3 one and it is disconnected to be regarded as R1 to realize voltage follow effect with phase dc amplifier
R2 and Rf are regarded as short circuit, i.e. Rf=R2=0 by road, i.e. R1=∞；It can be obtained according to the calculating formula with phase dc amplifier at this time
Change the voltage amplification factor Auf ≈ 1 of amplifier, i.e., output voltage is approximately equal with input voltage at this time, realizes output end pair
The voltage follow of input terminal.
Since the output impedance of voltage amplifier is generally relatively high, usually at several kilo-ohms to tens kilo-ohms, if rear class
Input impedance is smaller, then signal just has comparable partition losses in the output resistance of prime.During this time, it just needs
Voltage follower is wanted therefrom to be buffered.Play the role of forming a connecting link.Specifically, when input impedance is very high, just quite
Open a way in front stage circuits, when output impedance is very low, a constant pressure source be equivalent to late-class circuit, i.e., output voltage not by
Late-class circuit impedance influences.Therefore, influence of the load to input terminal is isolated by voltage follower completely.
Second processing module 12 is identical as 11 structure of first processing module, and difference is the input of Second processing module 12
Signal is the output signal of first processing module 11, so that the output signal of envelope eapsulotomy circuit is more leveled off to input signal, simultaneously
Second processing module 12 can also be avoided blocking when the gain effect of first processing module 11 is larger, guarantee circuit operation.
Its working principle is identical as first processing module, and details are not described herein.
Collected electric signal can isolate the influence loaded to input terminal by envelope eapsulotomy circuit, can believe input
Number high-precision guiding processing unit.
It should be noted that the reference signal that reference information module 14 provides can provide numerical value base for Second processing module 12
The output signal of standard, Second processing module 12 is changed on the basis of reference signal.
As shown in Fig. 2, for a preferred embodiment of envelope eapsulotomy circuit in the present embodiment, in which: the first processing mould
Block 11 includes first resistor 102 and the first operational amplifier 111；Second processing module 12 includes 3rd resistor 103 and the second fortune
Calculate amplifier 112；Buffer module 13 includes the 5th resistance 105, the 6th resistance 106 and the second grounding ports；Reference signal module
14 include the 4th resistance 104 and reference voltage port；Preposition earthing module 15 includes second resistance 101 and the first grounding ports；
The first end of the output end connection first resistor 102 of signal capture device, the second end connection first of first resistor 102
The output end of the positive input of operational amplifier 111, the first operational amplifier 111 connects the reverse input end of itself, constitutes
Negative-feedback circuit；
The first end of 3rd resistor 103 connects the output end of the first operational amplifier 111, and second end connects the second operation and puts
The positive input of big device 112, the output end of second operational amplifier 112 connect the reverse input end of itself, constitute negative-feedback
Circuit；
The output end of the first end connection second operational amplifier 112 of 5th resistance 105, second end connect processing unit
Input terminal；
The positive input of one end connection second operational amplifier 112 of 4th resistance 104, second end connect reference voltage
Interface 121；
The first end of the first end connection first resistor 102 of second resistance 101, the second end connection the of second resistance 101
One grounding ports, the first grounding ports ground connection；
The first end of 6th resistance 106 connects the second end of the 5th resistance 105, the second end connection of the 6th resistance 106 the
Two grounding ports, the second grounding ports ground connection.
It should be noted that constituting two by the operational amplifier of two negative-feedback connections of series connection in this preferred embodiment
Step voltage follows circuit, so that the more accurate stabilization of the output signal of envelope eapsulotomy circuit；First resistor 102,3rd resistor 103
Secondary voltage is serially connected in the 5th resistance 105 to follow in circuit, and buffering and current limliting can be carried out to circuit；4th resistance 104 concatenation
Between reference voltage interface 121 and second operational amplifier, impact of the reference voltage to circuit is reduced；Second resistance 101,
Six resistance 106 are serially connected in ground path, and integrated circuit is prevented to be distorted.
In the present embodiment, processing unit can be micro-control unit or comparator.
It should be noted that micro-control unit or comparator are used to carry out data comparison, by by envelope eapsulotomy circuit
It is compared with the numerical benchmark of setting, judges the real-time status of door machine.
As a preferred embodiment of the present embodiment, communication unit can be MTK-MT7681 wireless communication module or
High pass MSM8916-4G communication module.Information transmission speed can be accelerated using WIFI or 4G communication module, make door machine state
Feedback is more for real-time.
A kind of elevator door-motor condition monitoring system provided in this embodiment, operating method are as follows:
Door machine sensor internal electric signal of the elevator door-motor in enabling extreme position and shutdown extreme position is recorded, is denoted as
A1 and a2；The electric signal of door machine motor in normal work is recorded, b1 is denoted as；
Signal capture device collects the real-time working electric signal of counter element, and the signal that the first leakage current sensor captures is denoted as
C1, the signal that the second leakage current sensor captures are denoted as c2；
C1 and c2 input signal fidelity circuit is subjected to fidelity processing, it will treated c11 and c21 input processing unit；
Processing unit compares c11 and a1, a2, and c21 and b1 are compared；
Elevator door-motor is in enabling extreme position at this time if c11=a1, if elevator door-motor is in pass to c11=a2 at this time
Gate pole extreme position, the electric motor normal working at this time if c12=b1, if c12=0 motor stall at this time；
The comparing result of processing unit is sent to host computer by communication unit.
Effect explanation is carried out to the preferred embodiment of this implementation below:
When elevator door-motor acts, the first leakage current sensor captures the operating current of door machine sensor internal, the
Two leakage current sensors capture the operating current of door machine motor interior, and current signal is converted voltage by two leakage current sensors
Envelope eapsulotomy circuit is imported after signal.Envelope eapsulotomy circuit the signal received is buffered, is isolated, is stablized and filtering at
Reason guarantees that signal accurately enters processing unit.Processing unit carries out the signal received with the numerical benchmark recorded in advance
It compares, obtains the current state of elevator door-motor.
Vertical remote-ETCR025K can be used in first leakage current sensor and the second leakage current sensor described in the present embodiment,
Comparator is ST-LM393DT, and micro-control unit is Rui Sa-RX130.The Nomenclature Composition and Structure of Complexes of above equipment is big well known, therefore
It does not repeat herein.The innovative point of the invention is monitoring of this system to elevator door-motor state, therefore inner structure of elevator
As the prior art, do not repeat in this application.
The foregoing is merely the preferred embodiments of the invention, are not intended to limit the invention creation, all at this
Within the spirit and principle of innovation and creation, any modification, equivalent replacement, improvement and so on should be included in the invention
Protection scope within.
Claims (9)
1. a kind of elevator door-motor condition monitoring system, including signal capture device, envelope eapsulotomy circuit, processing unit and communication are single
Member, it is characterised in that: the signal capture device for acquiring element current in elevator door-motor, the envelope eapsulotomy circuit for pair
The electric signal of signal capture device output carries out fidelity processing, and the processing unit is used for the telecommunications after envelope eapsulotomy processing of circuit
It number is compared with preset value, the communication unit is used to comparison result being sent to host computer；The signal capture device it is defeated
Outlet is electrically connected with the input terminal of envelope eapsulotomy circuit, and the output end of envelope eapsulotomy circuit and the input terminal of processing unit are electrically connected
It connects, the output end of processing unit is electrically connected with the input terminal of communication unit.
2. a kind of elevator door-motor condition monitoring system according to claim 1, it is characterised in that the envelope eapsulotomy circuit
Include:
First processing module (11), input terminal are connected with the output end of signal capture device, to stablize the telecommunications number of access
Value；
Second processing module (12), input terminal are connected with the output end of first processing module (11), for further promoting the
One processing module (11) treated electric signal precision；
Buffer module (13), input terminal are connected with the output end of Second processing module (12), are used for Second processing module (12)
Output signal buffered；
Reference signal module (14), output end are connected with the input terminal of Second processing module (12), for electric to envelope eapsulotomy
Road provides reference signal.
3. a kind of elevator door-motor condition monitoring system according to claim 2, it is characterised in that: the envelope eapsulotomy circuit
It further include preposition earthing module (15), the input terminal of the preposition earthing module (15) and the input terminal of first processing module (11)
It is connected, to prevent envelope eapsulotomy circuit to be saturated.
4. a kind of door machine condition monitoring system according to claim 3, it is characterised in that: the first processing module (11)
Including first resistor (102) and the first operational amplifier (111)；Second processing module (12) includes 3rd resistor (103) and
Two operational amplifiers (112)；Buffer module (13) includes the 5th resistance (105), the 6th resistance (106) and the second grounding ports；
Reference signal module (14) includes the 4th resistance (104) and reference voltage port (121)；Preposition earthing module (15) includes second
Resistance (101) and the first grounding ports；
The first end of output end connection first resistor (102) of the signal capture device, the second end connection of first resistor (102)
The output end of the positive input of first operational amplifier (111), first operational amplifier (111) connects the reversed of itself
Input terminal constitutes negative-feedback circuit；
The output end of the first end connection the first operational amplifier (111) of the 3rd resistor (103), the second fortune of second end connection
The positive input of amplifier (112) is calculated, the output end of the second operational amplifier (112) connects the reversed input of itself
End constitutes negative-feedback circuit；
The output end of first end connection second operational amplifier (112) of 5th resistance (105), second end connection processing are single
The input terminal of member；
The positive input of one end connection second operational amplifier (112) of 4th resistance (104), second end connection reference
Voltage interface (121)；
The first end of first end connection first resistor (102) of the second resistance (101), the second end of second resistance (101)
Connect the first grounding ports, the first grounding ports ground connection；
The first end of 6th resistance (106) connects the second end of the 5th resistance (105), the second end of the 6th resistance (106)
Connect the second grounding ports, the second grounding ports ground connection.
5. a kind of elevator door-motor condition monitoring system according to claim 1, it is characterised in that: the signal capture device is
The first leakage current sensor being mounted on door machine sensor, first leakage current sensor is to capture door machine opening and closing movement
Current information.
6. a kind of elevator door-motor condition monitoring system according to claim 1, it is characterised in that: the signal capture device is also
Including the second leakage current sensor being mounted on door machine motor, second leakage current sensor is to capture motor work
Make electric current.
7. a kind of elevator door-motor condition monitoring system according to claim 1, it is characterised in that: the processing unit is micro-
Control unit or comparator.
8. a kind of elevator door-motor condition monitoring system according to claim 1, it is characterised in that: the communication unit is
MTK-MT7681 wireless communication module or high pass MSM8916-4G communication module.
9. a kind of elevator door-motor state monitoring method, which is characterized in that pass through any elevator door-motor shape of claim 1-8
State monitors system and realizes, comprising:
Record door machine sensor internal electric signal of the elevator door-motor in enabling extreme position and shutdown extreme position, be denoted as a1 and
a2；The electric signal of door machine motor in normal work is recorded, b1 is denoted as；
Signal capture device collects the real-time working electric signal of counter element, and the signal that the first leakage current sensor captures is denoted as c1,
The signal that second leakage current sensor captures is denoted as c2；
C1 and c2 input signal fidelity circuit is subjected to fidelity processing, it will treated c11 and c21 input processing unit；
Processing unit compares c11 and a1, a2, and c21 and b1 are compared；
Elevator door-motor is in enabling extreme position at this time if c11=a1, if elevator door-motor is in shutdown pole to c11=a2 at this time
Extreme position, the electric motor normal working at this time if c12=b1, if c12=0 motor stall at this time；
The comparing result of processing unit is sent to host computer by communication unit.
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| CN201810756303.4A CN109142910A (en) | 2018-07-11 | 2018-07-11 | A kind of elevator door-motor condition monitoring system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111521903A (en) * | 2020-07-03 | 2020-08-11 | 长沙润迅通信设备有限公司 | SPD resistive current online intelligent monitoring device and monitoring method |
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| CN108069313A (en) * | 2017-12-27 | 2018-05-25 | 比亦特网络科技（天津）有限公司 | Novel universal elevator monitoring and pre- diagnostic system |
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| CN111521903A (en) * | 2020-07-03 | 2020-08-11 | 长沙润迅通信设备有限公司 | SPD resistive current online intelligent monitoring device and monitoring method |
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Application publication date: 20190104 |