CN106441678A - System and method for measuring primary pressure of contact of load switch spring system - Google Patents
System and method for measuring primary pressure of contact of load switch spring system Download PDFInfo
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- CN106441678A CN106441678A CN201611039878.1A CN201611039878A CN106441678A CN 106441678 A CN106441678 A CN 106441678A CN 201611039878 A CN201611039878 A CN 201611039878A CN 106441678 A CN106441678 A CN 106441678A
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- gram force
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000003068 static effect Effects 0.000 claims abstract description 29
- 230000033001 locomotion Effects 0.000 claims abstract description 17
- 238000012545 processing Methods 0.000 claims description 20
- 238000004891 communication Methods 0.000 claims description 16
- 230000000052 comparative effect Effects 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 22
- 238000003908 quality control method Methods 0.000 abstract description 2
- 230000006870 function Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 235000014676 Phragmites communis Nutrition 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
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- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 230000007659 motor function Effects 0.000 description 1
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- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0057—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to spring-shaped elements
Abstract
The invention provides a system and a method for measuring primary pressure of a contact of a load switch spring system. The system comprises a gram force meter movement device and an image acquisition device, wherein the gram force meter movement device is used for pulling a static stationary spring leaf of a relay to be separated from a dynamic spring leaf through a gram force meter, and used for transmitting an image acquisition instrument when the static stationary spring leaf of a relay is separated from the dynamic spring leaf; the image acquisition device is connected with the ram force meter movement device, and is used for acquiring gram force meter reads according to the image acquisition instruction. By adopting the system and the method, an automatic measurement requirement of the primary pressure of the contact in an ammeter mounting load switch contact spring system can be achieved, measurement on primary pressure of one or more groups of ammeter load switch contacts can be automatically and independently controlled, and thus convenience in quality control and checking of operators can be brought.
Description
Technical field
The present invention relates to electric energy meter assembles compliance evaluation field with on-load switch contact spring system, espespecially a kind of electric energy meter is used
On-load switch spring system contact first pressing force measuring system and method.
Background technology
With intelligent electric energy meter popularization in China, on-load switch relay is used as cut-offfing and closed load electric current
Critical component be used widely, to realize " arrearage is operated a switch " function during electrical network sale of electricity.
It is a series of that electric energy meter on-load switch has high, big, strong antijamming capability of input and output control ratio of conversion level etc.
The irreplaceable advantage of solid electronic device, and versatility is good, stability is high, life-span length, small volume and the low advantage of price, because
This its be widely used in the intelligent electric meter of various models.But intelligent electric meter occurs in that the life-span in use and different in size shows
As disassembling analysis and finding that the reason for causing most of intelligent electric meter life-span inconsistent is mainly the life-span of electric energy meter on-load switch
Inconsistent.On electric energy meter on-load switch, analysis finds that it is which is closing to affect its life-span conforming one of the main reasons further
The moment meeting occurrence degree of conjunction is larger once even repeatedly to bounce, and can produce energy when contact occurs to bounce between 2 points of contact
Larger electric arc, so that relay contact occurs ablation to affect the life-span of relay, and then affects the life-span of intelligent electric meter.
One of the reason for contact occurs spring is that the quiet initial pressure that closes between stationary contact and moving together contact is not allowed in design
In the range of, it is therefore desirable in relay installation process, contact initial pressure is controlled, current electric energy meter is touched with on-load switch
The measurement of spring system initial pressure is mainly manually measured using gram force meter, and high labor intensive is subjective, has a strong impact on
Certainty of measurement；And can only be to batch products sampling measurement, it is impossible to realize batch products and measure one by one, therefore exploitation electric energy meter use
On-load switch contact spring system contact initial pressure self-operated measuring unit has very great meaning.
Content of the invention
Present invention aim at providing a kind of electric energy meter on-load switch contact spring system contact initial pressure automatic measurement system
And method, overcome Traditional Man to measure subjective, the not high problem of certainty of measurement with this, reduce loaded down with trivial details manual measurement
Link, can meet the demand of the quick measurement of current electric energy meter on-load switch contact spring system, improve efficiency, time-consuming.
For reaching above-mentioned purpose, first pressing force measuring system in on-load switch spring system contact provided by the present invention, concrete bag
The telecontrol equipment of meter containing gram force and image collecting device；The gram force meter telecontrol equipment pulls the quiet conjunction of relay based on by gram force
Static contact spring piece is separated with movable contact spring, and sends image capture instruction in quiet the conjunction when static contact spring piece is separated with movable contact spring of the relay；
Described image harvester is connected with the gram force meter telecontrol equipment, is read based on gathering gram force according to described image acquisition instructions
Number.
In above-mentioned on-load switch spring system contact first pressing force measuring system, it is preferred that the gram force meter telecontrol equipment
Comprising one or more ball screw slide units, the ball screw slide unit carries motor type relay quiet based on by drawing the gram force
Close static contact spring piece to separate with movable contact spring.
In above-mentioned on-load switch spring system contact first pressing force measuring system, it is preferred that the ball screw slide unit bag
Containing ball screw and motor；The ball screw is drawn based on driving the gram force according to instruction by the motor
The quiet static contact spring piece that closes of motor type relay is separated with movable contact spring；The motor is variable-ratio motion motor.
In above-mentioned on-load switch spring system contact first pressing force measuring system, it is preferred that the measuring system also includes
Processing module, processing module telecontrol equipment separation relay based on controlling the gram force is quiet close static contact spring piece and movable contact spring with
And control described image harvester to gather gram force meter reading according to described image acquisition instructions.
In above-mentioned on-load switch spring system contact first pressing force measuring system, it is preferred that the processing module is comprising control
Unit processed, communication unit and processor unit；Described control unit is used for sending the control ball screw slide unit drive gram force
Meter pulls the quiet control that closes static contact spring piece control instruction detached with movable contact spring and gram force meter is returned back to original reading of relay to refer to
Order, and according to the feedback signal output image acquisition instructions for receiving；The communication unit is used for receiving the control instruction
And the control instruction is sent to the processor unit, and receive processor unit feedback relay quiet close quiet
Feedback signal when reed is separated with movable contact spring；The processing unit is used for controlling the ball screw according to the control instruction
Slide unit moves, and closes output feedback signal when static contact spring piece is separated with movable contact spring when the relay is quiet.
In above-mentioned on-load switch spring system contact first pressing force measuring system, it is preferred that the processing module also includes
Alarm unit, the alarm unit by the reading based on obtaining the gram force is compared with predetermined threshold value, when more than or little
Alarm signal is sent when the predetermined threshold value.
In above-mentioned on-load switch spring system contact first pressing force measuring system, it is preferred that described image harvester bag
Containing one or more camera models and one or more image capture modules；The camera model is used for being gathered according to described image
The reading of gram force meter described in instruction acquisition, and the view data of collection acquisition is transmitted to described image acquisition module；The figure
As acquisition module is used for by described image data transfer to the processing unit；The processing unit is obtained according to described image data
Obtain the reading of the gram force meter.
In above-mentioned on-load switch spring system contact first pressing force measuring system, it is preferred that the camera model is industry
CCD camera.
In above-mentioned on-load switch spring system contact first pressing force measuring system, it is preferred that described image harvester is also
Comprising annular light source, the annular light source is used for providing photoenvironment for the camera model.
The present invention also provides a kind of on-load switch spring system contact first pressing force measuring method, and the measuring method includes：
The quiet static contact spring piece that closes of relay is pulled to separate with movable contact spring by gram force meter；When the quiet conjunction static contact spring piece of the relay is separated with movable contact spring
When send image capture instruction；Gram force meter reading is gathered according to described image acquisition instructions；The gram force meter for collecting is read
Number is compared with predetermined threshold value, is obtained comparative result and is stored.
The Advantageous Effects of the present invention are：Can install in on-load switch contact spring system to contact initial pressure in electric energy meter
Realize automatic measurement requirement, the measurement of on-load switch contact initial pressure of automatic, independently controlled one or more groups of electric energy meters,
The apparatus structure is simple, low cost, good economy performance, effectively reduces measurement cost.
Description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, not
Constitute limitation of the invention.In the accompanying drawings：
Fig. 1 is on-load switch spring system contact first pressing force measuring system structural representation；
Fig. 2 is on-load switch spring system contact first pressing force measuring method schematic flow sheet.
Specific embodiment
Purpose, technical scheme and advantage for making the embodiment of the present invention becomes more apparent, with reference to embodiment and attached
Figure, is described in further details to the present invention.Here, the schematic description and description of the present invention is used for explaining the present invention,
But it is not as a limitation of the invention.
Refer to shown in Fig. 1, first pressing force measuring system in on-load switch spring system contact provided by the present invention, the survey
Amount system is comprising gram force meter telecontrol equipment and image collecting device；The gram force meter telecontrol equipment is pulled based on by gram force and is continued
The quiet static contact spring piece that closes of electrical equipment is separated with movable contact spring, and is sent image and adopted in quiet the conjunction when static contact spring piece is separated with movable contact spring of the relay
Collection instruction；Described image harvester is connected with the gram force meter telecontrol equipment, for being gathered according to described image acquisition instructions
Gram force meter reading.
In said system, the gram force meter telecontrol equipment is mainly realized gram force meter and drives relay movable reed motion,
So as to realize the indirect measurement of contact initial pressure in the quiet conjunction static contact spring piece of relay and movable contact spring detached moment；And described image is adopted
Acquisition means are then mainly realized the reading to gram force meter and are gathered, and then the reading image can be entered by acquisition reading image of taking pictures
Row discriminatory analysiss, so as to obtaining and determining the reading of the gram force meter.
In above-mentioned on-load switch spring system contact first pressing force measuring system, the gram force meter telecontrol equipment includes one
Or multiple ball screw slide units, the ball screw slide unit quiet conjunction static contact spring piece of band motor type relay based on by drawing the gram force
Separate with movable contact spring；Wherein, the ball screw slide unit is comprising ball screw and motor；The ball screw is used for basis
Instruction drives the gram force meter to pull the quiet static contact spring piece that closes of relay to separate with movable contact spring by the motor；The stepping electricity
Machine is variable-ratio motion motor；In real work, the ball-screw slide unit is the group of ball-screw and motor
Close, Main Function is to drive the motion of gram force meter by the rotation of motor, so as to reach the purpose of dynamometry, other motor
The switch relay that meets for variable-ratio motion being set to for different initial pressures measures provides convenient；The gram force meter needs basis to treat
The relay contact initial pressure scope for surveying on-load switch selects suitable range.
For coordinating the control on-load switch spring system contact first pressing force measuring system, preferably implement in the present invention one
In example, the measuring system also includes processing module, processing module telecontrol equipment based on controlling the gram force further
The quiet conjunction static contact spring piece of relay is separated with movable contact spring and control the collection of described image harvester according to described image acquisition instructions
Gram force meter reading；Wherein, the processing module is comprising control unit, communication unit and processor unit；Described control unit is used
Gram force meter is driven to pull the control detached with movable contact spring of the quiet conjunction static contact spring piece of relay to refer in the control ball screw slide unit is sent
Make and gram force meter is returned back to the control instruction of original reading, and referred to according to the feedback signal output image collection for receiving
Order；The communication unit is used for receiving the control instruction and sending the control instruction to the processor unit, and
Receive the quiet feedback signal for static contact spring piece being closed when separating with movable contact spring of relay of processor unit feedback；The processing unit
For controlling the ball screw slide unit motion according to the control instruction, and static contact spring piece and dynamic spring is closed when the relay is quiet
Output feedback signal when piece is separated.In real work, described control unit completes to control ball-screw slide unit motor function, control
Ball-screw slide unit travels forward and drives the motion of gram force meter and control ball-screw slide unit setback to be returned to gram force meter
Position originally；Described control unit also sends image capture instruction with to industrial CCD camera, and by gram force meter measurement data
Contrast is carried out with design data and judge whether relay contact spring system is installed qualified.The communication unit is used for receiving the control
The ball-screw slide unit movement instruction of unit transmission simultaneously passes it to processor unit, and communication unit is additionally operable to pass to host computer
Pass the information that the relay contact spring system contact of processor unit feedback disconnects.The processor unit adopts DSP
Processor, the ball-screw slide unit motion command on the one hand sending for reception control unit, and feddback relay device contact
The information of disconnection；Another aspect processor unit is additionally operable to process the image that arrives of industrial CCD collected by camera and according to image procossing
As a result the reading of gram force meter is calculated.
For ease of operated by personnel, when detecting multiple on-load switch spring systems at the same time, the processing module may be used also
Comprising alarm unit, the alarm unit by the reading based on obtaining the gram force is compared with predetermined threshold value, when being more than
Or alarm signal is sent during less than the predetermined threshold value.With this, staff is reminded not conform to the on-load switch spring system of rule in time
System, is easy to rebuild and adjusts.
In the above-described embodiments, described control unit is connected with the communication unit, and described control unit is used for described
Processor unit sends ball-screw slide unit motion command, and control ball-screw slide unit is moved so as to drive gram force meter and gram force meter
Probe motion；Described control unit is additionally operable to receive and the contact of video-stream processor unit feedback disconnects information；Image is adopted
Acquisition means include：One control unit, a communication unit and processor unit, industrial CCD camera, an industry
Camera lens, an annular light source；This part communication unit is connected between described control unit and the processor unit, mainly
Information is disconnected for the contact that receiving processor unit feeds back to；When control unit receives the information of contact disconnection, control is single
First then send image capture instruction by communication unit to processor unit, now industrial CCD camera receives instruction and completes image
Collection.Treat that image acquisition completes image of the processor processing unit then to collecting and processes, carry out Image semantic classification first,
Then Edge extraction is carried out, and gram force meter reading now, processor is calculated finally according to the relation between image border
Computed information is fed back to unit control unit in time, and measurement data is compared by control unit with design data, from
And judge whether installation is qualified.Wherein, the communication unit can be CAN communication unit, and the communication unit purpose is to provide control
Communication port between unit processed and processor unit and image collecting device, here is no longer described in detail.
Refer to shown in Fig. 1 again, one or more camera moulds can be included in image collecting device provided by the present invention
Block and one or more image capture modules；The camera model is based on gathering the gram force according to described image acquisition instructions
Reading, and by collection obtain view data transmit to described image acquisition module；Described image acquisition module is used for institute
State view data to transmit to the processing unit；The processing unit obtains the reading of the gram force meter according to described image data
Number；Wherein, the camera model is industrial CCD camera.
In one preferred embodiment of the present invention, described image harvester also includes annular light source, the annular light source
For providing photoenvironment for the camera model.
In real work, the industrial CCD camera major function is that the image acquisition that the above-mentioned control unit of reception sends refers to
Order, the moment for disconnecting in contact completes the image acquisition of gram force meter dial plate and image is passed to image pick-up card；May be used also
Industrial lens are provided with, the industrial lens Main Function is that the image for coordinating above-mentioned industrial CCD camera to complete gram force meter is adopted
Collection；The annular light source mainly provides box-like photoenvironment for industrial CCD camera, it is to avoid the change of external environment is to industry
The image acquisition of CCD camera produces interference, improves certainty of measurement to greatest extent.Described image capture card major function is to receive work
Industry CCD camera shoots gained image, and image is passed to processor unit in real time.
The present invention also provides a kind of on-load switch spring system contact first pressing force measuring method, refer to shown in Fig. 2, described
Measuring method includes：The quiet static contact spring piece that closes of relay is pulled to separate with movable contact spring by gram force meter；Quiet spring is closed when the relay is quiet
Image capture instruction is sent with movable contact spring when piece is separated；Gram force meter reading is gathered according to described image acquisition instructions；To collect
The gram force meter reading be compared with predetermined threshold value, obtain comparative result and simultaneously store.
Can be according to electricity by first pressing force measuring system in on-load switch spring system contact provided by the present invention and method
Energy table on-load switch contact spring system realizes automatic measurement requirement to contact initial pressure in installation process, by control unit
The motion command of ball-screw slide unit is sent, and on-load switch contact is used so as to automatic, independently controlled one or more groups of electric energy meters
The measurement of initial pressure, can be rapidly completed the measurement of contact initial pressure；Control unit can be with real-time reception processor unit feedback
Contact first pressing force data, and whether the installation of automatic decision contact spring system is qualified, is easy to quality control officer to inquire about；The apparatus structure
Simply, low cost, good economy performance, single on-load switch lotus switch relay contact spring system contact initial pressure automatic measurement dress
By putting, multiple on-load switch testpieces are measured, reduce measurement cost.Device design take into full account multiple practical,
The on-load switch relay of measurement different model only needs to change gram force meter, convenient use, and with low cost.
Particular embodiments described above, has been carried out to the purpose of the present invention, technical scheme and beneficial effect further in detail
Describe in detail bright, the specific embodiment that the foregoing is only the present invention is should be understood that, the guarantor being not intended to limit the present invention
Shield scope, all any modification, equivalent substitution and improvement that within the spirit and principles in the present invention, is done etc., should be included in this
Within the protection domain of invention.
Claims (10)
1. a kind of on-load switch spring system contact first pressing force measuring system, it is characterised in that the measuring system includes gram force
Meter telecontrol equipment and image collecting device；
The gram force meter telecontrol equipment pulls the quiet static contact spring piece that closes of relay to separate with movable contact spring based on by gram force, and in institute
State quiet the conjunction when static contact spring piece is separated with movable contact spring of relay and send image capture instruction；
Described image harvester is connected with the gram force meter telecontrol equipment, for gathering gram force according to described image acquisition instructions
Meter reading.
2. first pressing force measuring system in on-load switch spring system contact according to claim 1, it is characterised in that described gram
Power meter telecontrol equipment includes one or more ball screw slide units, and the ball screw slide unit is based on by drawing the gram force
The quiet static contact spring piece that closes of band motor type relay is separated with movable contact spring.
3. first pressing force measuring system in on-load switch spring system contact according to claim 2, it is characterised in that the rolling
Ballscrew slide unit is comprising ball screw and motor；
The ball screw pulls the quiet spring of the quiet conjunction of relay based on driving the gram force according to instruction by the motor
Piece is separated with movable contact spring；
The motor is variable-ratio motion motor.
4. first pressing force measuring system in on-load switch spring system contact according to claim 2, it is characterised in that the survey
Amount system also includes processing module, and processing module telecontrol equipment separation relay based on controlling the gram force is quiet to close quiet spring
Piece controls described image harvester to gather gram force meter reading with movable contact spring and according to described image acquisition instructions.
5. first pressing force measuring system in on-load switch spring system contact according to claim 4, it is characterised in that the place
Reason module is comprising control unit, communication unit and processor unit；
Described control unit by send the control ball screw slide unit drive gram force based on pull relay quiet close static contact spring piece with
The detached control instruction of movable contact spring and gram force meter is returned back to the control instruction of original reading, and according to the feedback letter for receiving
Number output image acquisition instructions；
The communication unit is used for receiving the control instruction and sending the control instruction to the processor unit, and
Receive the quiet feedback signal for static contact spring piece being closed when separating with movable contact spring of relay of processor unit feedback；
The processing unit is used for controlling the ball screw slide unit motion according to the control instruction, and works as the relay
Output feedback signal when quiet conjunction static contact spring piece is separated with movable contact spring.
6. first pressing force measuring system in on-load switch spring system contact according to claim 4, it is characterised in that the place
Reason module also includes alarm unit, and the alarm unit by being compared the reading based on obtaining the gram force with predetermined threshold value
Relatively, when more than or less than the predetermined threshold value, alarm signal is sent.
7. first pressing force measuring system in on-load switch spring system contact according to claim 5, it is characterised in that the figure
As harvester is comprising one or more camera models and one or more image capture modules；
Reading of the camera model based on gathering the gram force according to described image acquisition instructions, and the figure that collection is obtained
As data transfer is to described image acquisition module；
Described image acquisition module is used for by described image data transfer to the processing unit；
The processing unit obtains the reading of the gram force meter according to described image data.
8. first pressing force measuring system in on-load switch spring system contact according to claim 7, it is characterised in that the phase
Machine module is industrial CCD camera.
9. first pressing force measuring system in on-load switch spring system contact according to claim 7, it is characterised in that the figure
As harvester also includes annular light source, the annular light source is used for providing photoenvironment for the camera model.
10. a kind of on-load switch spring system contact first pressing force measuring method, it is characterised in that the measuring method includes：
The quiet static contact spring piece that closes of relay is pulled to separate with movable contact spring by gram force meter；
Image capture instruction is sent when the quiet conjunction static contact spring piece of the relay is separated with movable contact spring；
Gram force meter reading is gathered according to described image acquisition instructions；
The gram force meter reading for collecting is compared with predetermined threshold value, is obtained comparative result and store.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611039878.1A CN106441678A (en) | 2016-11-10 | 2016-11-10 | System and method for measuring primary pressure of contact of load switch spring system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611039878.1A CN106441678A (en) | 2016-11-10 | 2016-11-10 | System and method for measuring primary pressure of contact of load switch spring system |
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| CN201611039878.1A Pending CN106441678A (en) | 2016-11-10 | 2016-11-10 | System and method for measuring primary pressure of contact of load switch spring system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108614208A (en) * | 2018-05-11 | 2018-10-02 | 广东电网有限责任公司 | Hydraulic actuating mechanism circuit-breaker switching on-off pressure drop data detection device and method |
| CN108919103A (en) * | 2018-05-11 | 2018-11-30 | 广东电网有限责任公司 | The anti-tripping data acquisition device of hydraulic actuating mechanism breaker and method |
| CN110083987A (en) * | 2019-05-21 | 2019-08-02 | 国网湖南省电力有限公司 | Intelligent electric energy meter built-in load switch static state counter-force analysis method, system and medium |
| CN111832207A (en) * | 2020-07-13 | 2020-10-27 | 哈尔滨工业大学 | Method for predicting relative minimum penetration distance of movable contact spring applied to sealed electromagnetic relay |
| CN113344977A (en) * | 2021-06-29 | 2021-09-03 | 河北工业大学 | Contact pressure measurement model construction method based on image processing |
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| 梁慧敏等: "继电器簧片接触系统网络模型", 《机电元件》 * |
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| CN108614208A (en) * | 2018-05-11 | 2018-10-02 | 广东电网有限责任公司 | Hydraulic actuating mechanism circuit-breaker switching on-off pressure drop data detection device and method |
| CN108919103A (en) * | 2018-05-11 | 2018-11-30 | 广东电网有限责任公司 | The anti-tripping data acquisition device of hydraulic actuating mechanism breaker and method |
| CN108614208B (en) * | 2018-05-11 | 2020-09-11 | 广东电网有限责任公司 | Device and method for detecting opening and closing voltage drop data of circuit breaker of hydraulic operating mechanism |
| CN110083987A (en) * | 2019-05-21 | 2019-08-02 | 国网湖南省电力有限公司 | Intelligent electric energy meter built-in load switch static state counter-force analysis method, system and medium |
| CN110083987B (en) * | 2019-05-21 | 2023-04-28 | 国网湖南省电力有限公司 | Method, system and medium for analyzing Guan Jingtai counter force of built-in load opening of intelligent electric energy meter |
| CN111832207A (en) * | 2020-07-13 | 2020-10-27 | 哈尔滨工业大学 | Method for predicting relative minimum penetration distance of movable contact spring applied to sealed electromagnetic relay |
| CN111832207B (en) * | 2020-07-13 | 2022-06-10 | 哈尔滨工业大学 | Method for predicting relative minimum penetration distance of movable contact spring applied to sealed electromagnetic relay |
| CN113344977A (en) * | 2021-06-29 | 2021-09-03 | 河北工业大学 | Contact pressure measurement model construction method based on image processing |
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Application publication date: 20170222 |