CN107014472A - A kind of dynamic electron miniature self-service car weighing apparatus of single hole cantilever beam foil gauge - Google Patents
A kind of dynamic electron miniature self-service car weighing apparatus of single hole cantilever beam foil gauge Download PDFInfo
- Publication number
- CN107014472A CN107014472A CN201710374333.4A CN201710374333A CN107014472A CN 107014472 A CN107014472 A CN 107014472A CN 201710374333 A CN201710374333 A CN 201710374333A CN 107014472 A CN107014472 A CN 107014472A
- Authority
- CN
- China
- Prior art keywords
- resistance strain
- weighing apparatus
- circuit
- cantilever beam
- foil gauge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/02—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G21/00—Details of weighing apparatus
Abstract
The invention provides a kind of dynamic electron miniature self-service car of single hole cantilever beam foil gauge weighing apparatus, including resistance strain system, voltage signal amplifying circuit, A/D data acquisitions and change-over circuit, controller, resistance strain gauge measuring circuit, display, information input equipment and weighing apparatus health monitoring system, wherein described resistance strain system is from sensing element of the resistance strain gage as weighing sensor, the cantilever beam of the resistance strain gage is using single elliptical aperture girder construction, an elliptical aperture is provided with tabular beam, pass through the effect of weight of object, power is all acted on to the central point of oval upper and lower surface, the resistance strain gage is pasted respectively in the top and bottom of elliptical aperture, so that four one group of foil gauges two are in opposite stressed zone, so as to which power is transformed on resistance strain gage.
Description
Technical field
The present invention relates to weighing technology, the dynamic electron miniature self-service car of particularly a kind of single hole cantilever beam foil gauge weighs.
Background technology
Electronics unmanned vehicle weighing apparatus is a kind of new electronic scale, with weighing rapid, degree of accuracy height, intuitive display, function
Complete the characteristics of, it is adaptable to unmanned vehicle under the occasion such as industry, business, building, storage, logistics shipping, or it is sensu lato nobody
The metering of intelligent transport equipment, is a kind of more satisfactory measurement instrument.Dynamic unmanned vehicle weighs by way of vehicle weighing or axle
Weight (non-vehicle) weighs the dynamic unmanned vehicle gross weight in mode, ponderable quantity traveling or the Automatic balance of axle weight.What vehicle was weighed
Dynamic unmanned vehicle weighing apparatus profile is identical with static electronic unmanned vehicle weighing apparatus, therefore can be made into sound dual-purpose electronic unmanned vehicle weighing apparatus, main
Be used for it is non-it is simple carried on trade clearing according to weighing result, and with weighing result progress technology judgement and statistics.
Some unmanned vehicles are used for logistic industry, and small volume, operation is convenient, and efficiently, but its trade settlement relies primarily on title
Sensor is retransmitted, and because its shipping signal is smaller, and the transport of such case must be low for the cost requirement of electronic scale, and
Precision must be high, additionally, due to for vehicle, then the service life of weighing apparatus and unattended warning function are just weighed very much
Will, therefore, for foil gauge in current existing weighing apparatus easily infringement and alarm free function defect, it is necessary to design new pin
To the electronic scale of unmanned vehicle.
The content of the invention
It is an object of the invention to provide a kind of dynamic electron miniature self-service car of single hole cantilever beam foil gauge weighing apparatus, including electricity
Resistive strain transducer system, voltage signal amplifying circuit, A/D data acquisitions and change-over circuit, controller, resistance strain gauge are surveyed
Circuit, display, information input equipment and weighing apparatus health monitoring system are measured, wherein the resistance strain system
System is from sensing element of the resistance strain gage as weighing sensor, and the cantilever beam of the resistance strain gage is using single oval hole beam
An elliptical aperture is provided with structure, tabular beam, by the effect of weight of object, power is all acted on to oval upper surface and following table
The central point in face, the resistance strain gage is pasted in the top and bottom of elliptical aperture respectively so that four one group of foil gauges two
In opposite stressed zone, so that power is transformed on resistance strain gage.
It is preferred that, the voltage signal amplifying circuit is amplified using integrated operational amplifier to signal, the integrated computation
Amplifier is made up of input stage, intergrade, output stage and the part of biasing circuit four.
It is preferred that, the voltage signal amplifying circuit is used as direct-coupled circuit and measuring circuit using differential amplifier circuit
Input stage, using the symmetry and negative feedback of circuit parameter, stable quiescent point is amplified difference mode signal, suppressed altogether
Mould signal, uses voltage gain stages for intergrade, and mutual symmetry voltage follower circuit is output stage, and current elements circuit constitutes biasing
Circuit and active pull-up circuit.
It is preferred that, the voltage signal amplifying circuit is put using FET or triode to sensor output signal
Greatly.
It is preferred that, the voltage signal amplifying circuit is using the precision amplifier having from zero and zero temp shift characteristic.
It is preferred that, the A/D data acquisitions are used with change-over circuit is compared A/D converter parallel, is internally integrated amplifier
Tailored version A/D converter or the controller built in A/D change-over circuits.
It is preferred that, the cantilever beam of the resistance strain gage is plastic material.
It is preferred that, the resistance strain gauge measuring circuit uses Wheatstone bridge, measures the resistance variations of resistance strain gage
Rate, and then unmanned vehicle weight is measured, wherein group bridge mode is divided into full-bridge, half-bridge or 1/4 bridge.
It is preferred that, the resistance strain gage can be used metal resistance strain gauge, semiconductor gauge, low temperature foil gauge, often
Warm foil gauge or high temperature strain foil, the metal resistance strain gauge should including metal wire type foil gauge, foil gage and film
Become piece.
It is preferred that, actual performance and storage that the weighing apparatus health monitoring system weighs dynamic electron miniature self-service car
Dynamic electron miniature self-service car weighing apparatus reference performance in controller is compared, if deviation is more than 5%, by described aobvious
Show device display alarm information.
According to the accompanying drawings to the detailed description of the specific embodiment of the invention, those skilled in the art will be brighter
Above-mentioned and other purposes, the advantages and features of the present invention.
Brief description of the drawings
Some specific embodiments of the present invention are described in detail by way of example, and not by way of limitation with reference to the accompanying drawings hereinafter.
Identical reference denotes same or similar part or part in accompanying drawing.It should be appreciated by those skilled in the art that these
What accompanying drawing was not necessarily drawn to scale.The target and feature of the present invention is considered to will be apparent from below in conjunction with the description of accompanying drawing,
In accompanying drawing：
Fig. 1 is the system block diagram weighed according to the dynamic electron miniature self-service car of the embodiment of the present invention.
Fig. 2 is the diplopore girder construction schematic diagram according to the embodiment of the present invention.
Embodiment
Referring to accompanying drawing 1, a kind of dynamic electron miniature self-service car of single hole cantilever beam foil gauge weighs, by resistance-type strain sensing
Device system, voltage signal amplifying circuit, A/D data acquisitions and change-over circuit, MSP430F149 controllers, resistance strain gauge measurement
Circuit, LCD1604 displays and keyboard composition, wherein the resistance strain system selects resistance strain gage conduct
The sensing element of weighing sensor, referring to accompanying drawing 2, the cantilever beam of the resistance strain gage is using single elliptical aperture girder construction, tabular
An elliptical aperture is provided with beam, by the effect of weight of object, power is all acted on to the center of oval upper and lower surface
Point, the resistance strain gage is pasted in the top and bottom of elliptical aperture respectively so that four one group of foil gauges two are in opposite
Stressed zone in so that power is transformed on resistance strain gage.Four resistance R1, R2, R3 and R4 are pasted altogether, when R1 and R4 deformation
During for stretching, R2 and R3 are compression, and four resistance constitute differential bridge, and the linearity of output characteristics is good.Elliptical aperture than
Circular hole improves deformation range and the sensitivity of foil gauge.
In addition, amplification system of the voltage signal amplifying circuit as electronic scale, the signal for sensor to be exported enters
Row amplification, so as to meet the requirement of analog-to-digital conversion, accurate in order to measure, amplification system should be ensured that input stage end is resistance when designing
The of a relatively high system of value, output stage is the relatively low system of resistance, and the ability disturbed with higher suppression common mode,
Systematically then multiplication factor should press the output quantity of sensor according to the output quantity of the weight respective sensor of testee
Accordingly amplify according to certain ratio.We have attempted various ways, and finally determining can be using three kinds of mode：(1) using integrated
Operational amplifier amplifies to signal, and integrated operational amplifier is by input stage, intergrade, output stage and the part group of biasing circuit four
Into voltage signal amplifying circuit, as direct-coupled circuit and the input stage of measuring circuit, utilizes electricity using differential amplifier circuit
The symmetry and negative feedback of road parameter, stable quiescent point, amplify difference mode signal, suppression common mode signal, using voltage
Gain stage is intergrade, and mutual symmetry voltage follower circuit is output stage, and current elements circuit constitutes biasing circuit and active load
Circuit.(2) voltage signal amplifying circuit is amplified using FET or triode to sensor output signal.(3) voltage
Signal amplification circuit is using the precision amplifier having from zero and zero temp shift characteristic.Three kinds of schemes can simplify circuit and cause
Circuit stability is poor.
A/D data acquisitions are designed with change-over circuit for the dynamic electron miniature self-service car weighing apparatus based on foil gauge, are used
The A/D conversions for compare A/D converter parallel, being internally integrated built in the tailored version A/D converter or the controller of amplifier are electric
Road is all possible, if it is considered that in the case of cost, power consumption and resolution ratio specifically chosen when, it is impossible to using parallel ratio
Compared with A/D converter, it is considered to which the size of weighing apparatus is more compact, it is easy to use in the case of, using tailored version or internally-arranged type.To change
The characteristic of kind cantilever beam, while cost is low, the cantilever beam of resistance strain gage is the moderate plastic material of hardness, is easy to beat by hand
Hole, while base uses plank.
Resistance strain gauge measuring circuit uses Wheatstone bridge, measures the resistance change rate of resistance strain gage, and then measures
Bear a heavy burden, wherein group bridge mode is divided into full-bridge, half-bridge, 1/4 bridge.Resistance R1, R2, R3, R4, R1 and R4 are respectively connected on four arms
Between, two lines are drawn between R2 and R3 respectively and are connected to operational amplifier, between R1 and R3, two are drawn between R2 and R4 respectively
Line connects the both positive and negative polarity of power supply.
Resistance strain gage is the conversion component that strain variation amount is transformed into resistance change, and gold can be used in resistance strain gage
Belong to resistance strain gage, semiconductor gauge, low temperature foil gauge, normal temperature foil gauge or high temperature strain foil, the metallic resistance strain
Piece includes metal wire type foil gauge, foil gage and thin film strain-gauge.It is corresponding with resistance strain gage to use electromotive strain method, base
It is linear with straining in the resistance change rate of the strain effect of foil gauge, i.e. resistance strain gage, when strain gauge adhesion is in quilt
When surveying on component, main transformer shape can be produced with member stress.
Weighing apparatus belongs to precision instrument, in order to increase the service life of instrument and use reliability, increase health status prison
Examining system, operation principle is that the actual performance that dynamic electron miniature self-service car weighs and the dynamic electron being stored in controller are small
Type unmanned vehicle weighing apparatus reference performance is compared, if deviation is more than 5%, passes through the display display alarm information.Here
Performance comparision includes the offset drift of weighing apparatus, temperature drift, the linearity and resolution ratio.
Although the present invention is described by reference to specific illustrative embodiment, will not be by these embodiments
Restriction and only limited by accessory claim.It should be understood by those skilled in the art that can be without departing from the present invention's
Embodiments of the invention can be modified and be changed in the case of protection domain and spirit.
Claims (10)
1. a kind of dynamic electron miniature self-service car weighing apparatus of single hole cantilever beam foil gauge, including resistance strain system, electricity
Signal amplification circuit, A/D data acquisitions and change-over circuit are pressed, controller, resistance strain gauge measuring circuit, display, information is defeated
Enter equipment and weighing apparatus health monitoring system, wherein the resistance strain system selects resistance strain gage conduct
The sensing element of weighing sensor, the cantilever beam of the resistance strain gage is used is provided with one on single elliptical aperture girder construction, tabular beam
Individual elliptical aperture, by the effect of weight of object, power is all acted on the central point of oval upper and lower surface, in elliptical aperture
Top and bottom paste the resistance strain gage respectively so that one group of four foil gauges two in opposite stressed zone,
So as to which power is transformed on resistance strain gage.
2. a kind of dynamic electron miniature self-service car weighing apparatus of single hole cantilever beam foil gauge according to claim 1, the voltage
Signal amplification circuit is amplified using integrated operational amplifier to signal, and the integrated operational amplifier is by input stage, intergrade, defeated
Go out level and the part of biasing circuit four composition.
3. a kind of dynamic electron miniature self-service car weighing apparatus of single hole cantilever beam foil gauge according to claim 2, the voltage
Signal amplification circuit, as direct-coupled circuit and the input stage of measuring circuit, utilizes circuit parameter using differential amplifier circuit
Symmetry and negative feedback, stable quiescent point amplify difference mode signal, suppression common mode signal, use voltage gain stages for
Intergrade, mutual symmetry voltage follower circuit is output stage, and current elements circuit constitutes biasing circuit and active pull-up circuit.
4. a kind of dynamic electron miniature self-service car weighing apparatus of single hole cantilever beam foil gauge according to claim 1, the voltage
Signal amplification circuit is amplified using FET or triode to sensor output signal.
5. a kind of dynamic electron miniature self-service car weighing apparatus of single hole cantilever beam foil gauge according to claim 1, the voltage
Signal amplification circuit is using the precision amplifier having from zero and zero temp shift characteristic.
6. a kind of dynamic electron miniature self-service car weighing apparatus of single hole cantilever beam foil gauge according to claim 1, the A/D numbers
Used according to collection with change-over circuit and compared A/D converter, the tailored version A/D converter for being internally integrated amplifier or the control parallel
A/D change-over circuits built in device processed.
7. a kind of dynamic electron miniature self-service car weighing apparatus of single hole cantilever beam foil gauge according to claim 1, the resistance
The cantilever beam of foil gauge is plastic material.
8. a kind of dynamic electron miniature self-service car weighing apparatus of single hole cantilever beam foil gauge according to claim 1, the resistance
Strain-ga(u)ge measurement circuit uses Wheatstone bridge, measures the resistance change rate of resistance strain gage, and then measures heavy burden, wherein organizing bridge
Mode is divided into full-bridge, half-bridge, 1/4 bridge.
9. a kind of dynamic electron miniature self-service car weighing apparatus of single hole cantilever beam foil gauge according to claim 1, the resistance
Metal resistance strain gauge, semiconductor gauge, low temperature foil gauge, normal temperature foil gauge or high temperature strain foil, institute can be used in foil gauge
Stating metal resistance strain gauge includes metal wire type foil gauge, foil gage and thin film strain-gauge.
10. a kind of dynamic electron miniature self-service car weighing apparatus of single hole cantilever beam foil gauge according to claim 1, the weighing apparatus
The actual performance that health monitoring system weighs dynamic electron miniature self-service car and the dynamic electron being stored in controller are small
Type unmanned vehicle weighing apparatus reference performance is compared, if deviation is more than 5%, passes through the display display alarm information.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710374333.4A CN107014472A (en) | 2017-05-24 | 2017-05-24 | A kind of dynamic electron miniature self-service car weighing apparatus of single hole cantilever beam foil gauge |
| PCT/CN2017/090679 WO2018214230A1 (en) | 2017-05-24 | 2017-06-29 | Single-hole cantilever beam strain gauge dynamic electronic small unmanned vehicle scale |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710374333.4A CN107014472A (en) | 2017-05-24 | 2017-05-24 | A kind of dynamic electron miniature self-service car weighing apparatus of single hole cantilever beam foil gauge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107014472A true CN107014472A (en) | 2017-08-04 |
Family
ID=59451185
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710374333.4A Pending CN107014472A (en) | 2017-05-24 | 2017-05-24 | A kind of dynamic electron miniature self-service car weighing apparatus of single hole cantilever beam foil gauge |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107014472A (en) |
| WO (1) | WO2018214230A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107989357A (en) * | 2018-01-22 | 2018-05-04 | 晋江万芯晨电子科技有限公司 | The intelligent scaffolding steel pipe of stress can be surveyed |
| CN109374164A (en) * | 2018-12-24 | 2019-02-22 | 天津大学 | A kind of right-angled intersection formula strain sensitive core for force snesor |
| CN109374162A (en) * | 2018-12-24 | 2019-02-22 | 天津大学 | A kind of strain sensitive core for force snesor |
| CN109374163A (en) * | 2018-12-24 | 2019-02-22 | 天津大学 | A kind of ditrysian type strain sensitive core for force snesor |
| CN113607970A (en) * | 2021-08-10 | 2021-11-05 | 镇江明润信息科技有限公司 | Method and device for measuring rotating speed by using centrifugal force |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992005416A1 (en) * | 1990-09-26 | 1992-04-02 | Ishida Scales Mfg. Co., Ltd. | Load cell |
| CN2676166Y (en) * | 2004-02-16 | 2005-02-02 | 耿季军 | Thin type weighing sensor |
| CN2903934Y (en) * | 2006-01-25 | 2007-05-23 | 程金台 | Cantilever type weighing sensor |
| CN102967351A (en) * | 2012-11-18 | 2013-03-13 | 大连理工大学 | Multipurpose micro-mass sensor of porous cantilever structure |
| CN104374453A (en) * | 2014-12-03 | 2015-02-25 | 烟台钧杰衡器有限公司 | Multichannel digitized intelligent unbalance loading error correcting and weighing sensor and weighing method thereof |
| CN204202717U (en) * | 2014-12-03 | 2015-03-11 | 烟台钧杰衡器有限公司 | Multichannel digital uneven loading error intelligence revises porous many beam types LOAD CELLS |
| CN204556063U (en) * | 2015-03-24 | 2015-08-12 | 宁波柯力传感科技股份有限公司 | Cantilever beam weighting transducer |
| CN105806461A (en) * | 2016-04-14 | 2016-07-27 | 缤刻普锐(北京)科技有限责任公司 | Special-shaped metal cantilever weighing device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7478001B2 (en) * | 2007-04-19 | 2009-01-13 | Hi-Tech Transport Electronics, Inc. | Systems and methods for temperature-compensated measuring of a load |
| CN201212834Y (en) * | 2008-07-08 | 2009-03-25 | 梅特勒-托利多(常州)精密仪器有限公司 | Elastomer for weighing sensor |
| CN201382812Y (en) * | 2009-04-08 | 2010-01-13 | 沈阳铁路局科学技术研究所 | Container unbalance-loading overweight detecting device |
| CN103162774A (en) * | 2011-12-15 | 2013-06-19 | 西安民生电热技术工程有限责任公司 | Bridge type two-channel weighing sensor |
| CN203148559U (en) * | 2012-12-26 | 2013-08-21 | 董金波 | Novel intelligent weighing system |
-
2017
- 2017-05-24 CN CN201710374333.4A patent/CN107014472A/en active Pending
- 2017-06-29 WO PCT/CN2017/090679 patent/WO2018214230A1/en active Application Filing
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992005416A1 (en) * | 1990-09-26 | 1992-04-02 | Ishida Scales Mfg. Co., Ltd. | Load cell |
| CN2676166Y (en) * | 2004-02-16 | 2005-02-02 | 耿季军 | Thin type weighing sensor |
| CN2903934Y (en) * | 2006-01-25 | 2007-05-23 | 程金台 | Cantilever type weighing sensor |
| CN102967351A (en) * | 2012-11-18 | 2013-03-13 | 大连理工大学 | Multipurpose micro-mass sensor of porous cantilever structure |
| CN104374453A (en) * | 2014-12-03 | 2015-02-25 | 烟台钧杰衡器有限公司 | Multichannel digitized intelligent unbalance loading error correcting and weighing sensor and weighing method thereof |
| CN204202717U (en) * | 2014-12-03 | 2015-03-11 | 烟台钧杰衡器有限公司 | Multichannel digital uneven loading error intelligence revises porous many beam types LOAD CELLS |
| CN204556063U (en) * | 2015-03-24 | 2015-08-12 | 宁波柯力传感科技股份有限公司 | Cantilever beam weighting transducer |
| CN105806461A (en) * | 2016-04-14 | 2016-07-27 | 缤刻普锐(北京)科技有限责任公司 | Special-shaped metal cantilever weighing device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107989357A (en) * | 2018-01-22 | 2018-05-04 | 晋江万芯晨电子科技有限公司 | The intelligent scaffolding steel pipe of stress can be surveyed |
| CN109374164A (en) * | 2018-12-24 | 2019-02-22 | 天津大学 | A kind of right-angled intersection formula strain sensitive core for force snesor |
| CN109374162A (en) * | 2018-12-24 | 2019-02-22 | 天津大学 | A kind of strain sensitive core for force snesor |
| CN109374163A (en) * | 2018-12-24 | 2019-02-22 | 天津大学 | A kind of ditrysian type strain sensitive core for force snesor |
| CN113607970A (en) * | 2021-08-10 | 2021-11-05 | 镇江明润信息科技有限公司 | Method and device for measuring rotating speed by using centrifugal force |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018214230A1 (en) | 2018-11-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107014472A (en) | A kind of dynamic electron miniature self-service car weighing apparatus of single hole cantilever beam foil gauge | |
| CN107144330A (en) | A kind of dynamic electron miniature self-service car weighing apparatus of diplopore cantilever beam foil gauge | |
| US3650340A (en) | Strain gage weighing device | |
| CN104034469B (en) | The assay method of crane wheel load | |
| CN103822692A (en) | Freight transport vehicle load monitoring method and device based on ultrasonic ranging sensors | |
| CN107167269A (en) | A kind of strain-type electronic dynamometer | |
| CN213932791U (en) | Goods weighing and ranging device and logistics vehicle thereof | |
| CN107014473A (en) | A kind of dynamic electron miniature self-service car weighing apparatus of three holes cantilever beam foil gauge | |
| US3443652A (en) | Vehicle weighing device | |
| CN108760108A (en) | Crane wheel pressure detection method based on stress survey technology | |
| US7146860B2 (en) | Method for temperature compensation of a digital pressure meter | |
| CN206330658U (en) | A kind of simple high-precision electronic scale | |
| Gaikwad et al. | Design and development of novel weighing scale system | |
| WO2023173744A1 (en) | Comprehensive high-precision intelligent real-time vehicle weighing method and system | |
| CN203053529U (en) | Weighting device | |
| Suryana et al. | Strain gage for mass sensor using cantilever beam | |
| KR20000072271A (en) | Detection system which measures and detects physical quantity of structure by transformational detector applied from strain guage | |
| US20100300190A1 (en) | Monocoque of vehicle capable of detecting strain | |
| CN106840706B (en) | Sideslip detection method and device based on strain gauge type | |
| Sombatsompop et al. | Design and construction of photo-conductive light pressure sensor for highly viscous fluids | |
| EP3645984A1 (en) | A weighing device | |
| RU132539U1 (en) | BRIDGE PRESSURE TENSOR CONVERTER TYPE | |
| JPS6217694Y2 (en) | ||
| CN2709931Y (en) | Constant-flow static resistance strain gauge | |
| CN215448136U (en) | Spring weighing machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170804 |