CN203323842U - Parallel beam weighing sensor - Google Patents
Parallel beam weighing sensor Download PDFInfo
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- CN203323842U CN203323842U CN2013203908391U CN201320390839U CN203323842U CN 203323842 U CN203323842 U CN 203323842U CN 2013203908391 U CN2013203908391 U CN 2013203908391U CN 201320390839 U CN201320390839 U CN 201320390839U CN 203323842 U CN203323842 U CN 203323842U
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- parallel girder
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- slit
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Abstract
The utility model relates to a parallel beam weighing sensor. The sensor comprises an elastomer. At least one part of the elastomer is divided into an upper parallel beam and a lower parallel beam which are mutually separated. There is a slit between a central section of the upper parallel beam and a central section of the lower parallel beam. The upper parallel beam possesses a groove which is arranged at the position of the slit. The lower parallel beam possesses a boss which is arranged at the position of the slit. The boss is inserted into the groove and maintains a gap with the groove in a normal state.
Description
Technical field
The utility model relates to the weighing instrument field, especially relates to a kind of parallel girder LOAD CELLS.
Background technology
The parallel girder LOAD CELLS is one of sensor the most frequently used in LOAD CELLS, is widely used in the industry fields such as electronic scales, kitchen scale, jewelry scale, is indispensable core component in industry and agricultural automation system.The advantage of parallel girder sensor is that precision is high, and measurement range is wide, and the life-span is long, simple in structure, and good frequency response can be worked under mal-condition, is easy to realize miniaturization, integration and diversification of varieties etc.
Basic structure and the principle of work of parallel girder sensor are as follows: elastic body (or flexible member, sensitive beam) produces elastic deformation under external force, makes to stick on its surperficial resistance strain gage (conversion element) also in company with producing distortion; After the resistance strain gage distortion, its resistance will change (as increased or reducing), then through corresponding metering circuit, this resistance variations will be converted to electric signal (as voltage or electric current), thereby complete the process that external force is transformed to electric signal.
The parallel girder LOAD CELLS generally is applied to the weighing of low capacity, so elastic body is at the position thinner thickness of pasting foil gauge.Under the effect that is subject to rated load power more than 1.5 times, elastic body is easy to occur that local stress surpasses the phenomenon of material yield stress, makes elastomeric mechanical property change even fracture.
Also some can realize overload protection function to existing diplopore parallel girder sensor, but all has following significantly shortcoming: only for special sensor, and narrow application range, the volume increase is larger, and requirement on machining accuracy is high, and cost is larger.
The LOAD CELLS that for example Chinese utility model patent application 201010510746.9 proposes, its overload protection mode is to add a motionless fixed beam in two parallel girders.When sensor transships, upper beam is because distortion can contact with middle fixed beam.Fixed beam has been shared load and has been protected underbeam, plays the antioverloading purpose.This structure can be born larger overload power, but shortcoming is to add a fixed beam in the middle of two parallel girders.Extra fixed beam will inevitably increase the volume and weight of sensor.And fixed beam be subject to structural limitations from bearing end away from.This has just caused in fixed beam apical position place the parallel girder deflection very small.If can not in the middle of upper beam and fixed beam, process by integrated job operation the effective term that enough little gap meets overload protection.Adjust gap width so must inlay two cylinders at the fixed beam end.Such design causes volume, difficulty of processing, assembly difficulty, cost all will be multiplied.
And for example Chinese utility model patent 200720058642.2 antioverloading principles are the power that fixed beam is born overload that arranges in the middle of two parallel girders equally.This structural volume is larger, and external structure is arranged, and can not make the closed type sensor.
The utility model content
The purpose of this utility model is to provide a kind of parallel girder LOAD CELLS, the one or more problems that exist to overcome prior art.
The utility model is that to solve the problems of the technologies described above the technical scheme adopted be to propose a kind of parallel girder LOAD CELLS, comprise an elastic body, this elastomeric at least a portion is divided into upper parallel girder spaced apart from each other and lower parallel girder, above between parallel girder middle part and this time parallel girder middle part, there is a slit, wherein should there is a groove at this slit place by upper parallel girder, this time parallel girder has a boss at this slit place, this boss stretch in this groove and and this groove between keep normally a gap.
In an embodiment of the present utility model, on this, the parallel girder middle part separates by a pair of perforation be interconnected respectively with this time parallel girder two ends.
In an embodiment of the present utility model, on this, parallel girder and this time parallel girder are provided with foil gauge in each perforation place.
In an embodiment of the present utility model, this groove and this boss are positioned at the lateral center position of this slit.
In an embodiment of the present utility model, the parallel girder LOAD CELLS also comprises corrugated tube, and this elastomeric seal is in this corrugated tube.
The utility model by arranging and can stop groove and the boss of the relative changing of the relative positions of upper and lower two beam to realize overload protection between two parallel girders.Compare existing overcurrent protection structure, the utility model does not need extra parts, implements simple, technical difficulty and processing cost lower.
The accompanying drawing explanation
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent, below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated, wherein:
The sensor outside drawing that Fig. 1 is the utility model one embodiment.
The A-A directional profile structural representation that Fig. 2 is Fig. 1.
The Z place partial enlarged drawing that Fig. 3 is Fig. 2.
The stress deformation figure of the sensor that does not add overload protection that Fig. 4 is prior art when overload.
The stress deformation figure of the sensor that adds overload protection that Fig. 5 is the utility model one embodiment when overload.
Embodiment
The sensor outside drawing that Fig. 1 is the utility model one embodiment.The A-A directional profile structural representation that Fig. 2 is Fig. 1.Shown in seeing figures.1.and.2, the parallel girder LOAD CELLS 10 of the present embodiment is the sensor of sylphon seal type, comprises corrugated tube 11 and is sealed in the elastic body 12 in corrugated tube 11.Elastic body 12 is core components of sensor, below will be illustrated.
The Z place partial enlarged drawing that Fig. 3 is Fig. 2.Shown in Fig. 2,3, the same with the elastic body in existing parallel girder LOAD CELLS, the elastic body 12 of the present embodiment has a part at least by minute upper parallel girder 21 and a lower parallel girder 22.Upper parallel girder 21 and lower parallel girder 22 are spaced apart from each other.Wherein, left end and lower parallel girder 22 left ends at upper parallel girder 21, rely on a pair of perforation 23,24 to separate.Be interconnected between perforation 23,24, form and be similar to the cucurbit shape.Similarly, right-hand member and lower parallel girder 22 right-hand members at upper parallel girder 21, rely on a pair of perforation 25,26 to separate.Be interconnected between perforation 25,26, form and be similar to the cucurbit shape.Upper parallel girder 21 and lower parallel girder 22 are provided with foil gauge 27 at each perforation 23,24,25,26 place, have 4.The mode that these foil gauges 27 can attach is arranged on parallel girder 21 and lower parallel girder 22.And the position of setting can be by cutting out the upper parallel girder 21 of respectively boring a hole after 23,24,25,26 and the thinnest part of lower parallel girder 22.
There is a slit 28 between upper parallel girder 21 middle parts and lower parallel girder 22 middle parts.Therefore upper parallel girder 21 and lower parallel girder 22 are that normality is separated.In the present embodiment, upper parallel girder 21 has a groove 21a at slit 28 places, and lower parallel girder 22 has a boss 22a at slit 28 places.This boss 22a stretch in groove 21a and and groove 21a between keep normally a gap.As an example, the gap between boss 22a and groove 21a is 0.25mm.
In the present embodiment, boss 22a and groove 21a provide overload protection.The power of bearing overload by independent fixed beam from routine is different, and boss 22a and groove 21a are just on the parallel girder in needing protection, and overload protection works the stressed 22a direction of rear boss perpendicular to loading direction, does not share load and protects elastic body.
In embodiment of the present utility model, the quantity of boss 22a and the groove 21a that coordinates with it is not limited to one, can also be a plurality of.
The stress deformation figure of the sensor that adds overload protection that Fig. 5 is the utility model one embodiment when overload.Shown in Fig. 5, this overload protection principle be: after sensor 10 overload, when upper and lower two parallel girders 21,22 distortion changing of the relative positions distances equal between boss 22a and groove 21a gap, two parallel girders 21,22 produce and contact, and have triggered overload protection mechanism.Originally the unsettled quadrilateral structure of diplopore parallel girder has become two triangular structures that stable summit is connected; structural weak point is transferred to two connected summits of triangle from tetragonal four summits (paster that parallel girder is the thinnest) and locates namely contact point T place; and elastic body herein is the most abundant; change the mechanics of elastic bodies structure thereby play; reduce strain regions stress, protect elastomeric purpose.
The stress deformation figure of the sensor that does not add overload protection that Fig. 4 is prior art when overload.By finite element analysis, the elastic body of not changing is after the power F effect that is subject to the rated load twice as shown in Figure 4, and bearing end can deform to the Y-axis negative direction, and upper beam 41, with underbeam 42, the directions X parallel changing of the relative positions in opposite directions can occur simultaneously.By calculating, the distance of the changing of the relative positions approximates 2/3rds of bearing part sinking maximum displacement.And now the maximum stress at elastic body strain gauge adhesion place has reached MPa more than 700, although do not reach Materials Yield Limit, the precision of sensor produced to impact, as increased power F, sensor will damage even fracture again.
Get back to Fig. 5 of the present embodiment.By finite element analysis, after changing structure, after power F surpasses 15 times of rated load, the groove 21a of upper beam 21 and the boss 22a of underbeam 22 can be because the relative changing of the relative positions laminatings of two beams, continue to increase F to twice load, the position that whole sensor maximum stress place has departed from the foil gauge paster, and maximum stress numerical value only has MPa more than 100, far below Materials Yield Limit.Sensor anti-overload ability several times strengthen.
Therefore, under comparing, the overload protection method of the present embodiment has following advantage:
1, implement simply, the mechanism that can stop the relative changing of the relative positions of upper and lower two beam is set between two parallel girders and can realizes protection.
2, the distance of the mutual changing of the relative positions of upper and lower two beam can be adjusted by the parameters such as spacing of adjusting the left and right perforation, can realize adjusting the changing of the relative positions distance of upper underbeam by minimum structural adjustment.
3, the high-speed wire linear cutting equipment that common roughing is used just can easily be realized the joint-cutting that 0.18mm is above, and the effective term of overload protection is low, easily adjusts.
4, technical threshold and the cost realized are low.
In sum, the overcurrent protection structure that embodiment of the present utility model provides a kind of principle to be different from existing diplopore parallel girder LOAD CELLS fully, go for the diplopore parallel girder sensor of most of low capacities, and do not increase volume.The parallel girder load cell structure of the utility model embodiment is simple, and technical threshold is low, and cost increases little.
Although the utility model is described with reference to current specific embodiment, but those of ordinary skill in the art will be appreciated that, above embodiment is only for the utility model is described, in the situation that do not break away from variation or the replacement that the utility model spirit also can be made various equivalences, therefore, as long as in connotation scope of the present utility model in the scope to the variation of above-described embodiment, claims that modification all will drop on the application.
Claims (5)
1. a parallel girder LOAD CELLS, comprise an elastic body, it is characterized in that this elastomeric at least a portion is divided into upper parallel girder spaced apart from each other and lower parallel girder, above between parallel girder middle part and this time parallel girder middle part, there is a slit, wherein should there is a groove at this slit place by upper parallel girder, this time parallel girder has a boss at this slit place, this boss stretch in this groove and and this groove between keep normally a gap.
2. parallel girder LOAD CELLS as claimed in claim 1, is characterized in that, on this, the parallel girder middle part separates by a pair of perforation be interconnected respectively with this time parallel girder two ends.
3. parallel girder LOAD CELLS as claimed in claim 2, is characterized in that, on this, parallel girder and this time parallel girder are provided with foil gauge in each perforation place.
4. parallel girder LOAD CELLS as claimed in claim 1, is characterized in that, this groove and this boss are positioned at the lateral center position of this slit.
5. parallel girder LOAD CELLS as claimed in claim 1, is characterized in that, also comprises corrugated tube, and this elastomeric seal is in this corrugated tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203908391U CN203323842U (en) | 2013-07-02 | 2013-07-02 | Parallel beam weighing sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203908391U CN203323842U (en) | 2013-07-02 | 2013-07-02 | Parallel beam weighing sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203323842U true CN203323842U (en) | 2013-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203908391U Expired - Fee Related CN203323842U (en) | 2013-07-02 | 2013-07-02 | Parallel beam weighing sensor |
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| CN (1) | CN203323842U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104280099A (en) * | 2013-07-02 | 2015-01-14 | 梅特勒-托利多(常州)精密仪器有限公司 | Parallel girder weighing sensor |
| CN106644012A (en) * | 2015-10-29 | 2017-05-10 | 上海朝辉压力仪器有限公司 | Vehicle-mounted weighing transmitter |
-
2013
- 2013-07-02 CN CN2013203908391U patent/CN203323842U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104280099A (en) * | 2013-07-02 | 2015-01-14 | 梅特勒-托利多(常州)精密仪器有限公司 | Parallel girder weighing sensor |
| CN104280099B (en) * | 2013-07-02 | 2016-12-28 | 梅特勒-托利多(常州)精密仪器有限公司 | Parallel girder LOAD CELLS |
| CN106644012A (en) * | 2015-10-29 | 2017-05-10 | 上海朝辉压力仪器有限公司 | Vehicle-mounted weighing transmitter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131204 Termination date: 20160702 |