WO2005024357A2 - Gehäuselose wägezelle - Google Patents
Gehäuselose wägezelle Download PDFInfo
- Publication number
- WO2005024357A2 WO2005024357A2 PCT/EP2004/009680 EP2004009680W WO2005024357A2 WO 2005024357 A2 WO2005024357 A2 WO 2005024357A2 EP 2004009680 W EP2004009680 W EP 2004009680W WO 2005024357 A2 WO2005024357 A2 WO 2005024357A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- load cell
- housing
- cell according
- foot
- head
- Prior art date
Links
- 230000002093 peripheral effect Effects 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 210000004027 cell Anatomy 0.000 claims description 62
- 210000005056 cell body Anatomy 0.000 claims description 34
- 150000001875 compounds Chemical class 0.000 claims description 8
- 230000007704 transition Effects 0.000 claims description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 238000004382 potting Methods 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 238000003466 welding Methods 0.000 description 3
- IWZSHWBGHQBIML-ZGGLMWTQSA-N (3S,8S,10R,13S,14S,17S)-17-isoquinolin-7-yl-N,N,10,13-tetramethyl-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-amine Chemical compound CN(C)[C@H]1CC[C@]2(C)C3CC[C@@]4(C)[C@@H](CC[C@@H]4c4ccc5ccncc5c4)[C@@H]3CC=C2C1 IWZSHWBGHQBIML-ZGGLMWTQSA-N 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 229920002457 flexible plastic Polymers 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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
- G01G19/08—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for incorporation in vehicles
- G01G19/12—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for incorporation in vehicles having electrical weight-sensitive devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
- G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
- G01G3/14—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing measuring variations of electrical resistance
- G01G3/1402—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
- G01G3/1408—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being of the column type, e.g. cylindric
Definitions
- the invention relates to a housing-free load cell with a load cell body comprising a head, a torso and a foot, the head being offset from the torso by at least one upper, rotationally symmetrical recess that runs symmetrically around the Langsach.se of the load cell body, the recess being towards the torso has a tapering surface and a surface tapering towards the head, the fuselage is essentially cylindrical, and the fuselage is offset from the foot by at least one lower, rotationally symmetrical recess that runs around the longitudinal axis of the load cell body, the recess extending towards the foot Surface and a surface running towards the fuselage.
- Load cells for example pendulum load cells for use in road vehicle wagons, generally consist of a measuring element stuck with strain gauges, which is referred to below as the load cell body.
- the load cell body is made of a high-strength metallic material, usually steel, and comprises a head, a foot and a fuselage arranged between them.
- Strain gauges are arranged on the surface of the load cell body at a suitable location, usually on the essentially cylindrical body. These strain gauges, usually constant or karma strain gauges, are usually electrically connected as a full heatstone bridge. To protect the strain gauges from water or.
- a separate housing is arranged around the load cell body against moisture or dirt.
- a calibration chamber is also attached to this housing, in which electronics for electrical calibration of the load cell, for example for determining the zero point, the characteristic value, the temperature behavior, etc., and optionally a signal processing device are located. This . Calibration chamber is also used for. Protection of electronic components from moisture and dirt.
- Load cell body is provided a transverse through hole, in the middle of which a membrane has been retrofitted, to which the strain gauges are glued. It is also known, instead of a through hole and a separate membrane, to provide two transverse holes lying on the same axis, the depth of which is less than the radius of the fuselage, and which form a web between them, which has the function of the membrane and on which the strain gauges are glued ,
- moisture and dirt can still collect at various points on the load cell body, including in the transverse holes, and damage the load cell body, for example due to corrosion. Moisture can accumulate, particularly in the area of the rotationally symmetrical punctures that separate the trunk from the head or foot.
- a balancing chamber is still required to accommodate the balancing electronics.
- the present invention is based on the object of creating a housing-free load cell which is particularly resistant to environmental influences and has a high measurement accuracy.
- the previously derived and shown object is first achieved in that, in the case of a housing-free load cell with the features of the preamble of patent claim 1, at least the The majority of the surface of the upper recess and / or the majority of the surface of the lower recess has an oblique profile, such that when the load cell is installed as intended, water can flow onto the load cell body, whereby the angle ⁇ x between the inclined part of the surface of the upper recess that runs towards the trunk and the vertical peripheral surface of the trunk and / or the angle ⁇ 2 between the inclined part of the surface of the lower recess that runs towards the foot and the peripheral surface of the foot j is sometimes greater than 90 ° and is in particular between 93 ° and 120 °. A value of 117.5 ° has proven to be particularly suitable.
- the surface line of the upper recess and / or the lower recess always has a bevel in the area that runs downwards, which ideally extends to the edge of the fuselage or. of the foot. In this area Impinging water or accumulating moisture flows away in this way, and dirt particles are also washed away. This significantly reduces the risk of corrosion in the area of the punctures.
- the angle ⁇ 2 between the surface of the lower recess running towards the fuselage and the vertical peripheral surface of the fuselage and / or the angle ⁇ i between the surface of the upper recess and the peripheral surface running towards the head of the head is in each case greater than 90 ° and in particular is between 93 ° and 120 °, as a result of which an inclined surface is also formed in the upper region of the punctures, on which water can flow off more easily than on a horizontal surface.
- a value of 117.5 ° has proven particularly suitable.
- the surface of the upper recess which runs towards the trunk can also have an oblique course in the region which is not covered by the head, and / or the area of the lower recess that runs towards the fuselage can also have an oblique course in the area that is not covered by the foot. Covered is the area of the inclined surfaces which, when the load cell body is viewed from above or. from underneath is covered by the head or foot and is therefore not visible.
- the upper recess and / or the lower recess in longitudinal section have an at least partially curved, in particular circular, elliptical or parabolic, course of the surface line. having .
- Other courses of the surface line are also conceivable, as long as it is ensured that there is sufficient slope of the surfaces in the area of the recess so that moisture can drain off optimally.
- the transition region between the surface of the upper recess that runs towards the trunk and the vertical peripheral surface of the trunk and / or the transition region between the surface of the lower recess that runs towards the foot and the peripheral surface of the foot is in each case chamfered or rounded , Accordingly, it is conceivable that the transition region between the surface of the upper recess that runs out towards the head and the peripheral surface of the head is in each case beveled or rounded. In this way, edges are avoided and instead a shape is created where water can drain off easily.
- Edges by chamfering or rounding can also be avoided in the transition area between the inner surface of the transverse holes and the vertical circumferential surface of the fuselage.
- strain gauges are arranged on the web, which are electrically connected to an adjustment electronics, which is arranged in one of the transverse holes.
- Temperature compensation in particular a me-shaped layer made of nickel, may no longer require a separate balancing chamber.
- the adjustment electronics are arranged directly in the area of the strain gauges.
- strain gauges are advantageously surrounded by a potting compound, for example a potting compound made of plastic, in particular flexible plastic, so that they are now completely protected from moisture or dirt in the transverse holes.
- the casting compound can also serve as a fastening for the printed circuit board by at least partially embedding it in the casting compound.
- a particularly good measurement result is achieved if at least one strain gauge is arranged on each side of the web.
- a hole can be provided in the web for the electrical connection of the strain gauges and the adjustment electronics, through which the connecting lines are guided.
- a cable bushing can be provided in the load cell body, through which the signal and power supply lines are led outwards from one of the transverse holes into a load cell cable.
- This cable bushing is advantageously sealed against moisture and dirt.
- Particularly good protection against moisture and dirt is achieved if the cross holes are closed with lids.
- the lid can be closed by welding, in particular by micro plasma welding. This ensures optimal tightness of the cover. It is also possible, as an alternative or in addition, to glue, screw on and / or tighten the covers.
- the circumferential surface of the foot has at least one essentially vertical groove, which with a protruding element provided on the lower plate in each case installed condition of the load cell can interact.
- a protruding element can be, for example, a pin, which extends in particular perpendicular to the longitudinal axis of the weighing cell body.
- Several grooves are also conceivable, which can be arranged around the circumference at equal intervals, as well as several corresponding elements in the lower plate. In this way, the load cell is secured against rotation, which ensures permanent positioning of the load cell and thus significantly reduces the risk of measurement errors.
- FIG. 2 shows a longitudinal section of the load cell from FIG. La);
- Fig. 3 shows a cross section of the load cell from Fig. La
- a housing-free load cell for two "different load levels is shown, namely in Fig. La) for a load level of 50 t and in Fig. Lb) for a load level of 25 t.
- the load cell shown comprises one each Load cell body 1, which in turn consists of a head 2, a trunk 3 and a foot 4.
- the head 2 is offset from the trunk 3 by an upper recess 5, which runs rotationally symmetrically around the longitudinal axis of the load cell body 1.
- the trunk 3 is at the bottom Foot 4 is offset by a corresponding recess 6.
- the essentially cylindrical fuselage 3 has two transverse holes 7 and 8 in its vertical circumferential surface, of which only one transverse hole 7 can be seen in the view selected in Fig. La) and b) are each sealed with a welded cover 9 by welding.
- a cable bushing 10 is also provided in the load cell body 1, through which the signal and power supply lines are led outward from the front transverse hole 7 into a load cell cable 11. Since the load cell shown does not have a separate housing and is therefore directly exposed to environmental influences, in particular water, moisture, dirt, etc., no flat surfaces running perpendicular to the longitudinal axis are formed. It can thus be clearly seen that the surface 12 tapering towards the fuselage 3 and the surface 13 of the upper recess 5 tapering towards the head 2 have an oblique course, so that water or moisture can drain off directly and cannot accumulate.
- a corresponding embodiment also has the surface 14 tapering towards the foot 4 and the surface 15 of the lower recess 6 tapering towards the trunk 3.
- the transition area 16 between the inner surface of the transverse holes 7 and 8 and the vertical circumferential surface of the fuselage 3 is also slightly beveled, so that water can also flow off directly here.
- FIG. 2 shows a longitudinal section through the load cell from Fig. La).
- Fig. La shows a longitudinal section through the load cell from Fig. La).
- the two recesses 5 and 6 are designed in such a way that the angle ⁇ x between the surface 12 of the upper recess 5 tapering towards the trunk 3 and the vertical circumferential surface of the trunk 3 is greater than 90 °.
- the angle beta 2 between the outgoing to the foot 4 towards surface 14 of the lower puncture 6 and the 'peripheral surface of the foot 4.
- both the angle ⁇ 2 between the ⁇ for trunk 3 towards outgoing surface 15 of the lower puncture 6 and the vertical peripheral surface of the fuselage 3 and the Angle ⁇ i between the surface 13 of the upper recess 5 tapering towards the head 2 and the circumferential surface of the head 2 is in each case greater than 90 °.
- the surface line is approximately parabolic.
- Fig. 2 also shows the two transverse holes 7 and 8, which are so deep that a web 17 is still formed between them, to which a strain gauge 18 is glued on both sides.
- the strain gauge 18 is each surrounded by a potting compound made of flexible plastic. Due to the relatively soft potting compound 19, the strain gauges 18 are permanently protected against mechanical and climatic influences, in particular also during the adjustment procedure.
- a separate, welded-on cover 20 closes the two transverse holes 7 and 8 from the outside.
- the adjustment electronics consisting of a printed circuit board 21 and a meandering layer 22 made of nickel for temperature compensation.
- the adjustment electronics is fixed in that the printed circuit board 21 is embedded on one side in the potting compound 19. In this way, a separate balancing chamber can be completely dispensed with, since it is formed by the transverse hole 7.
- Fig. 2 also shows a vertical groove 24 in which a pin extending perpendicular to the longitudinal axis of the load cell can engage, which is firmly connected to a lower plate which carries the load cell in the installed state.
- This anti-rotation device ensures permanent positioning to reduce the
- Fig. 3 shows a cross section through the load cell from FIG. La). It can be clearly seen that a bore 23 runs through the web 17, which is formed between the transverse holes 7 and 8, through which the lines for the electrical connection of the strain gauges 18 and the adjustment electronics are guided. Furthermore, the cable bushing 10 is shown, through which the signal and power supply lines are led out of the transverse hole 7 into the load cell cable 11.
- 4a) and b) two embodiments of the load cell according to the invention are shown in longitudinal section.
- 4a) shows a load cell in which the surface 12 of the upper recess 5 tapering towards the fuselage 3 and the surface 15 of the lower recess 6 tapering towards the fuselage 3 predominantly have an oblique course and only in the end region of the surfaces 12 and 15 there is a narrow annular area which has a profile perpendicular to the longitudinal axis of the load cell body 1.
- 4b) shows an embodiment which is preferable to FIG. 4a) according to the solution according to the invention, in which the surfaces 12 and 15 have an oblique course up to the upper or lower edge of the fuselage 3 to have. 4a) and b) furthermore show that the surface 12 and the surface 15 each also have an oblique course in the region which is not covered by the head 2 or the foot 4. The covered area is on the right of the dashed line, the uncovered area on the left.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/569,931 US7319198B2 (en) | 2003-09-05 | 2004-08-31 | Housingless load cell |
EP04764646A EP1660847A2 (de) | 2003-09-05 | 2004-08-31 | Gehäuselose wägezelle |
JP2006525699A JP2007504465A (ja) | 2003-09-05 | 2004-08-31 | ハウジングレスロードセル |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10341482A DE10341482B4 (de) | 2003-09-05 | 2003-09-05 | Gehäuselose Wägezelle |
DE10341482.7 | 2003-09-05 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2005024357A2 true WO2005024357A2 (de) | 2005-03-17 |
WO2005024357A3 WO2005024357A3 (de) | 2005-08-11 |
Family
ID=34258508
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2004/009680 WO2005024357A2 (de) | 2003-09-05 | 2004-08-31 | Gehäuselose wägezelle |
Country Status (6)
Country | Link |
---|---|
US (1) | US7319198B2 (de) |
EP (1) | EP1660847A2 (de) |
JP (1) | JP2007504465A (de) |
CN (1) | CN100575892C (de) |
DE (1) | DE10341482B4 (de) |
WO (1) | WO2005024357A2 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017128078A1 (de) | 2017-11-28 | 2019-05-29 | Minebea Intec GmbH | Verdrehsensor für eine Wägezelle |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8436261B2 (en) * | 2004-12-13 | 2013-05-07 | Nate John Coleman | Cantilever beam scale |
US9360383B2 (en) | 2013-04-04 | 2016-06-07 | Nate J. Coleman and Aexius, LLC | System and method to measure force or location on an L-beam |
DE102008064169B4 (de) * | 2008-12-22 | 2013-07-18 | Hottinger Baldwin Messtechnik Gmbh | Wägezelle |
DE102010014152B4 (de) | 2010-04-07 | 2015-12-24 | Hottinger Baldwin Messtechnik Gmbh | Wägezelle |
CN104142172A (zh) * | 2013-05-08 | 2014-11-12 | 宁波博达电气有限公司 | 一种数字称重传感器及其安装方法 |
CN104807529A (zh) * | 2014-06-23 | 2015-07-29 | 蒋旭东 | 一种具有耐腐蚀性能的称重传感器 |
CN106338304B (zh) * | 2016-06-24 | 2018-10-30 | 湖北泰和电气有限公司 | 一种压力和地强组合测力装置 |
DE102016118045A1 (de) | 2016-09-23 | 2018-03-29 | Minebea Intec GmbH | Querkraft-unempfindliche Messzelle |
KR102019944B1 (ko) * | 2019-04-09 | 2019-09-09 | 경희대학교 산학협력단 | 총 이온화 선량 효과에 기인한 완전 공핍형 실리콘 온 인슐레이터 공정을 이용한 집적 회로의 성능 저하 측정 장치 및 방법 |
DE102020126521A1 (de) | 2020-10-09 | 2022-04-14 | Minebea Intec GmbH | Wägezelle mit verbesserter Linearität |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2901235A (en) * | 1956-11-21 | 1959-08-25 | Toledo Scale Corp | Platform supporting structure for weighing scales |
US4838372A (en) * | 1987-09-12 | 1989-06-13 | U.S. Philips Corporation | Load cell |
EP0800069A1 (de) * | 1996-04-01 | 1997-10-08 | Societa' Cooperativa Bilanciai - Campogalliano a Responsabilita' Limitata | Säulenförmiger Kraftwandler |
WO2001018504A1 (de) * | 1999-09-07 | 2001-03-15 | Gwt Global Weighing Technologies Gmbh | Verformungskörper |
US20020069708A1 (en) * | 2000-08-24 | 2002-06-13 | Mckenna Paul A. | Double-ended load cell and method of mounting same |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0194234A (ja) * | 1987-10-06 | 1989-04-12 | Kyowa Electron Instr Co Ltd | 荷重変換器 |
US4804053B1 (en) * | 1987-11-10 | 1996-09-03 | Flintab Ab | Rocker pin load cell |
US4955441A (en) * | 1989-09-26 | 1990-09-11 | Toledo Scale Corporation | Load cell mounting for rotational control |
CN2061687U (zh) * | 1989-12-12 | 1990-09-05 | 襄樊卧龙传感器厂 | 电子计价秤专用称重传感器 |
JP3453654B2 (ja) * | 2000-05-22 | 2003-10-06 | ミネベア株式会社 | トルク量変換器 |
GB2369889B (en) * | 2001-07-13 | 2004-06-09 | John David Barnett | Strain sensing installation |
US6888074B2 (en) * | 2003-06-10 | 2005-05-03 | The Flintec Group, Ltd. | Compression column load cell |
-
2003
- 2003-09-05 DE DE10341482A patent/DE10341482B4/de not_active Expired - Fee Related
-
2004
- 2004-08-31 CN CN200480025410A patent/CN100575892C/zh not_active Expired - Fee Related
- 2004-08-31 US US10/569,931 patent/US7319198B2/en not_active Expired - Fee Related
- 2004-08-31 JP JP2006525699A patent/JP2007504465A/ja active Pending
- 2004-08-31 EP EP04764646A patent/EP1660847A2/de not_active Withdrawn
- 2004-08-31 WO PCT/EP2004/009680 patent/WO2005024357A2/de active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2901235A (en) * | 1956-11-21 | 1959-08-25 | Toledo Scale Corp | Platform supporting structure for weighing scales |
US4838372A (en) * | 1987-09-12 | 1989-06-13 | U.S. Philips Corporation | Load cell |
EP0800069A1 (de) * | 1996-04-01 | 1997-10-08 | Societa' Cooperativa Bilanciai - Campogalliano a Responsabilita' Limitata | Säulenförmiger Kraftwandler |
WO2001018504A1 (de) * | 1999-09-07 | 2001-03-15 | Gwt Global Weighing Technologies Gmbh | Verformungskörper |
US20020069708A1 (en) * | 2000-08-24 | 2002-06-13 | Mckenna Paul A. | Double-ended load cell and method of mounting same |
Non-Patent Citations (1)
Title |
---|
See also references of EP1660847A2 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017128078A1 (de) | 2017-11-28 | 2019-05-29 | Minebea Intec GmbH | Verdrehsensor für eine Wägezelle |
DE102017128078B4 (de) | 2017-11-28 | 2022-09-01 | Minebea Intec GmbH | Verdrehsensor für eine Wägezelle |
Also Published As
Publication number | Publication date |
---|---|
DE10341482A1 (de) | 2005-04-07 |
CN1846120A (zh) | 2006-10-11 |
US20070007049A1 (en) | 2007-01-11 |
JP2007504465A (ja) | 2007-03-01 |
WO2005024357A3 (de) | 2005-08-11 |
DE10341482B4 (de) | 2005-07-21 |
US7319198B2 (en) | 2008-01-15 |
EP1660847A2 (de) | 2006-05-31 |
CN100575892C (zh) | 2009-12-30 |
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