WO2006034795A1 - Messgrössenaufnehmer - Google Patents
Messgrössenaufnehmer Download PDFInfo
- Publication number
- WO2006034795A1 WO2006034795A1 PCT/EP2005/010099 EP2005010099W WO2006034795A1 WO 2006034795 A1 WO2006034795 A1 WO 2006034795A1 EP 2005010099 W EP2005010099 W EP 2005010099W WO 2006034795 A1 WO2006034795 A1 WO 2006034795A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sheet metal
- metal part
- spring steel
- meßgrößenaufnehmer
- deformation body
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G21/00—Details of weighing apparatus
- G01G21/30—Means for preventing contamination by dust
-
- 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
- G01G3/1412—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being parallelogram shaped
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2206—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
- G01L1/2218—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being of the column type, e.g. cylindric, adapted for measuring a force along a single direction
- G01L1/2225—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being of the column type, e.g. cylindric, adapted for measuring a force along a single direction the direction being perpendicular to the central axis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2206—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
- G01L1/2243—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being parallelogram-shaped
Definitions
- the invention relates to a hermetically sealed measuring transducer according to the preamble of patent claim 1 and to the use of a high-strength hardenable corrosion-resistant maraging spring steel according to the preamble of patent claim 7 for the hermetic sealing of a transducer.
- Measuring sensors are usually used to detect a physical measured quantity and to convert this into a corresponding electrical signal.
- a physical force is often detected by means of which a deformation body is applied, to which strain gauges are applied, which convert the force into a proportional electrical measurement signal by means of the expansion-induced change in resistance.
- Such transducers are used as force transducers, load cells, expansion, torque or pressure transducers, which are often arranged in moist rooms or must be exposed to other unfavorable environmental influences.
- a force transducer which consists of a rod-shaped deformation or compression body and is used as a load cell.
- a continuous transverse bore is provided approximately in the middle of the longitudinal rod-shaped compression body, which is closed by two disc-shaped opposite support plates.
- the strain gauges are attached to the insides of the carrier plates, the carrier plates being welded or soldered to the lateral surface of the upsetting body.
- a hermetic seal of the strain gauges is achieved, with the sealing carrier plate directly acting as a deformation body, so that the Force is detected directly in the force shunt branch.
- both the compression body and the support plates made of the same metal, so that on the entire deformation body as homogeneous as possible surface elongation occurs, which is proportional to the weight load.
- structural changes also occur at the weld or solder joints as a result of the thermal stress, which can lead to non-linearities on the deformation body, which impairs the measurement accuracy.
- EP 0 752 575 B1 discloses a rod-shaped load cell with hermetically sealed strain gauges, in which the strain gauges are mounted directly on the rod-shaped deformation body.
- the strain gauges are mounted directly on the rod-shaped deformation body.
- preformed metal sheet covers are used, which are welded directly on the edge side on the rod-shaped deformation body and have a radial distance to the strain gauges.
- the strain gauges are partially arranged in transverse bores of the axially formed deforming body.
- the vor ⁇ preferably by a laser welding process with the circumference of the deformation body are hermetically sealed. Due to the radial distance from the strain gauges and the shape of the sheet metal covers, a significant influence on the power supply was avoided.
- rod-shaped load cells are preferably designed for larger loads and compressive deformation body load, so that the influence of the cover at cup-like training and ra ⁇ dialem distance to the measurement result is relatively low.
- the Kraftneben gleicheinl of such steel sheet covers would be considerably larger, so that only Abdeck ⁇ forms with relatively steep and high Napf- or sidewall parts are necessary to te in Meßkraftraum mögli ⁇ ches To be flexible, so that the force shunt effect does not distort the measurement result.
- the invention was therefore based on the object of providing a measuring quantity sensor whose strain gauges are permanently resistant to harmful environmental influences, in particular
- the sealing means should also be producible at low cost and in the simplest manner attachable to the deformation body and not appreciably impair the measurement accuracy.
- Sheet metal cover only a small increase in the positive creep effect determined, which was compensated in a simple way even by the negative creep property of the strain gauges, so that by the thin metal sheet cover and the hard Federblecheigenschaft with high thermoforming ability a ver negligible force shunt effect occurred.
- This advantageously made it possible to produce hermetically sealed measuring transducers with very high accuracy values, such as, for example, load cells with an accuracy class C6 according to OIML R60 and a number of parts of n LC 6000.
- the invention furthermore has the advantage that the high-strength curable maraging spring steel used has a high resistance to corrosion and good laser weldability, so that in a simple manner a permanent hermetically sealed Ab ⁇ encapsulation of the sensitive strain gauges can be achieved and this surprisingly with only the slightest negative metrological influence.
- mechanical stabilities were achieved, in particular with very thin-walled sheet metal part covers of preferably 0.1 mm, which are only achievable with austenitic steels at much higher sheet thicknesses and thus advantageously also offer a high mechanical protection against external influences.
- FIG. 1 shows a side view of a bending beam sensor
- FIG. 2 shows an enlarged detail in plan view of a hermetically sealed strain gauge.
- a Meß beneficialnier beneficia is shown in the form of a Biegebalkenaufsacrificings 1, the two Dehnungs ⁇ measuring strip 2 in two opposing holes 3, the steel by means of two cup-shaped sheet metal parts 4 from a special high-strength hardenable corrosion-resistant Feder ⁇ steel from maraging Type are hermetically sealed.
- the Biegebalkenauf productivity 1 consists of a Kraftein Arthurs ⁇ part 5, to which a weighing platform 9 is fixed and a firmly clamped force receiving part 6.
- a deformation body 7 is arranged, consisting essentially of two gegen ⁇ is formed in front of intermediate holes 8, between which a senk ⁇ right partition wall 8 remains, to which on each side Deh ⁇ voltage gauges 2 in the form of Scherkraftaufillon appli ⁇ are.
- the arrangement of the two strain gauges 2 in the opposite holes 3 is shown in detail from the sectional view in Fig. 2 of the drawing.
- the Biegebalkenauf choir 1 is rectangular and is preferably used as a load cell for weight determination.
- the bending beam is formed in one piece and consists vorzugs ⁇ of a special high-strength hardenable corrosion-resistant martensitigen spring steel, which was produced by machining and in particular for metrstechni ⁇ cal purposes little hysteresis and has only low creep behavior. Therefore, very accurate force and weight measurements can be carried out with such transducers.
- Derar ⁇ term Meß conductingnaufillon with strain gauges 2 on ent-speaking kraftbeetzschlagbaren deformation bodies 7 can be produced in other embodiments and can also be used for torque, pressure, strain measurement or other force-relevant measurements.
- the illustrated force transducer or load cell contains strain gauges 2 in the form of shear force transducers, which are applied to the vertical intermediate wall 8 and are therefore provided within a bore 3.
- these strain gauges 2 are hermetically sealed by a cup-shaped sheet-metal part 4 made of a special maraging steel, which extends into the bore 3 and is welded all around with its outer edge 10 to the deformation body 7 preferably automatically by means of a laser welding system.
- the cup-shaped sheet-metal part 4 is produced by a deep drawing process and consists of a maraging spring steel known from DE 100 01 650 A1, which is manufactured and sold under the trade name Marvac 125 by the company Vacuumschmelze GmbH from D-63460 Hanau ,
- This maraging steel preferably consists of an alloy with 7.8% by weight of nickel, 13% by weight of chromium, 1% by weight of molybdenum, 0.2% by weight of silicon, 0.3% by weight.
- the cup-shaped sheet-metal part 4 is made of a thin maraging steel sheet of preferably 0.1 mm thickness by deep drawing her ⁇ .
- the illustrated embodiment for a bending beam load cell has a round diameter of about 20 mm at a depth of about 10 mm, which is set in a 25 mm bore ein ⁇ .
- the cup-shaped sheet-metal part 4 has an outer edge 19 flattened at right angles to the outside, which rests on the outer edge of the deformation body 7 and can be welded thereto completely automatically.
- Such cup-shaped sheet-metal parts 4 for hermetic sealing of strain gauges 2 to transducers are not only within bores 3 attachable, but also directed to the outside to cover strain gauges 2 on flat outer wall surfaces suitable.
- Such Napfformen need not be round, but are due to the good thermoformability basically in angular shape design produced.
- the side wall parts 11 which can be deformed under load can also be formed in corrugated form in order to reduce the low force shunt effect. Due to the good deep-drawing ability, it is also possible to produce inwardly directed cup-shaped formations with round as well as angular formations, as are necessary, for example, for double bending beam receivers with double bores.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Measurement Of Force In General (AREA)
- Measuring Fluid Pressure (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05788701A EP1794560A1 (de) | 2004-09-28 | 2005-09-20 | Messgrössenaufnehmer |
US11/663,907 US20070277621A1 (en) | 2004-09-28 | 2005-09-20 | Measuring Sensor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004047508A DE102004047508B3 (de) | 2004-09-28 | 2004-09-28 | Messgrößenaufnehmer |
DE102004047508.3 | 2004-09-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006034795A1 true WO2006034795A1 (de) | 2006-04-06 |
Family
ID=35285573
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2005/010099 WO2006034795A1 (de) | 2004-09-28 | 2005-09-20 | Messgrössenaufnehmer |
Country Status (4)
Country | Link |
---|---|
US (1) | US20070277621A1 (de) |
EP (1) | EP1794560A1 (de) |
DE (1) | DE102004047508B3 (de) |
WO (1) | WO2006034795A1 (de) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7644628B2 (en) * | 2005-12-16 | 2010-01-12 | Loadstar Sensors, Inc. | Resistive force sensing device and method with an advanced communication interface |
DE102007017981B4 (de) | 2007-04-05 | 2008-12-04 | Bizerba Gmbh & Co. Kg | Kraftmesszelle und Verfahren zur Herstellung einer Kraftmesszelle |
DE102008064169B4 (de) | 2008-12-22 | 2013-07-18 | Hottinger Baldwin Messtechnik Gmbh | Wägezelle |
CN202158916U (zh) * | 2009-09-30 | 2012-03-07 | 泰科思有限责任公司 | 用于检测形变的测量装置 |
DE102010014152B4 (de) | 2010-04-07 | 2015-12-24 | Hottinger Baldwin Messtechnik Gmbh | Wägezelle |
DE102011115496A1 (de) | 2011-10-10 | 2013-04-11 | Bizerba Gmbh & Co. Kg | Wägezelle |
EP2857816A4 (de) * | 2012-05-25 | 2015-12-09 | Hitachi Ltd | Mechanische mengenmessvorrichtung |
JP6203629B2 (ja) * | 2013-12-24 | 2017-09-27 | 株式会社マルサン・ネーム | 重量センサ及び重量センサユニット |
JP6162670B2 (ja) * | 2014-10-03 | 2017-07-12 | 株式会社東京測器研究所 | ひずみゲージ用合金及びひずみゲージ |
DE102016004038B3 (de) * | 2016-04-02 | 2017-08-24 | Werner Steprath | Kraftmessbolzen, ein Kraftsensor, der besonders für den Einsatz in Ackerschleppern geeignet ist. |
DE102018113771B4 (de) * | 2018-06-08 | 2023-05-25 | Schenck Process Europe Gmbh | Messvorrichtung zur Ermittlung von Zug- und Druckkräften, insbesondere Wägezelle |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4459863A (en) * | 1982-08-09 | 1984-07-17 | Safelink Ab | Shear beam load cell |
EP0752575A2 (de) * | 1995-07-07 | 1997-01-08 | Hottinger Baldwin Messtechnik Gmbh | Wägezelle |
DE10001650A1 (de) * | 2000-01-17 | 2001-07-26 | Vacuumschmelze Gmbh | Federstahl vom Maraging-Typ |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2507501A (en) * | 1945-07-14 | 1950-05-16 | Clark James | Pressure operated resistor |
US3212325A (en) * | 1963-07-30 | 1965-10-19 | Katz Lester | Force measuring instrument |
US3444499A (en) * | 1967-01-16 | 1969-05-13 | Endevco Corp | Strain gauge |
US3521484A (en) * | 1967-03-06 | 1970-07-21 | Electro Dev Corp | Load measuring system |
US3696317A (en) * | 1970-08-19 | 1972-10-03 | Waukesha Bearings Corp | Low capacity, low profile load cell |
JPS55140112A (en) * | 1979-04-19 | 1980-11-01 | Tokyo Electric Co Ltd | Weighing device employing load cell |
US4596155A (en) * | 1983-12-27 | 1986-06-24 | Kistler-Morse Corporation | Isotropic strain sensor and load cell employing same |
DD242680A1 (de) * | 1985-11-14 | 1987-02-04 | Akad Wissenschaften Ddr | Hochdruckaufnehmer |
DE3730703A1 (de) * | 1987-09-12 | 1989-03-23 | Philips Patentverwaltung | Kraftaufnehmer |
JPH02150537U (de) * | 1989-05-24 | 1990-12-26 | ||
US5265461A (en) * | 1991-03-19 | 1993-11-30 | Exxon Production Research Company | Apparatuses and methods for measuring ultrasonic velocities in materials |
US5220971A (en) * | 1991-09-24 | 1993-06-22 | Sensortronics | Shear beam, single-point load cell |
US5313022A (en) * | 1992-11-12 | 1994-05-17 | Kistler-Morse Corporation | Load cell for weighing the contents of storage vessels |
DE19948045B4 (de) * | 1998-10-06 | 2008-01-10 | Takata Corp. | Sitzgewichtsmeßvorrichtung |
ATE302939T1 (de) * | 2001-12-15 | 2005-09-15 | S C A I M E S A | Messwertaufnehmer |
US6789435B2 (en) * | 2002-10-01 | 2004-09-14 | Hottinger Baldwin Measurements, Inc. | Hermetically sealed load cell |
-
2004
- 2004-09-28 DE DE102004047508A patent/DE102004047508B3/de not_active Expired - Fee Related
-
2005
- 2005-09-20 WO PCT/EP2005/010099 patent/WO2006034795A1/de active Application Filing
- 2005-09-20 US US11/663,907 patent/US20070277621A1/en not_active Abandoned
- 2005-09-20 EP EP05788701A patent/EP1794560A1/de not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4459863A (en) * | 1982-08-09 | 1984-07-17 | Safelink Ab | Shear beam load cell |
EP0752575A2 (de) * | 1995-07-07 | 1997-01-08 | Hottinger Baldwin Messtechnik Gmbh | Wägezelle |
DE10001650A1 (de) * | 2000-01-17 | 2001-07-26 | Vacuumschmelze Gmbh | Federstahl vom Maraging-Typ |
Also Published As
Publication number | Publication date |
---|---|
DE102004047508B3 (de) | 2006-04-20 |
EP1794560A1 (de) | 2007-06-13 |
US20070277621A1 (en) | 2007-12-06 |
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