CH701412A2 - Load cell for electrically measuring negative and positive injection force in plastic-injection molding machine, has thin membrane bending in S-stripe form, and strain gauges measuring force and pressed by pressing-strain sensors - Google Patents
Load cell for electrically measuring negative and positive injection force in plastic-injection molding machine, has thin membrane bending in S-stripe form, and strain gauges measuring force and pressed by pressing-strain sensors Download PDFInfo
- Publication number
- CH701412A2 CH701412A2 CH10622009A CH10622009A CH701412A2 CH 701412 A2 CH701412 A2 CH 701412A2 CH 10622009 A CH10622009 A CH 10622009A CH 10622009 A CH10622009 A CH 10622009A CH 701412 A2 CH701412 A2 CH 701412A2
- Authority
- CH
- Switzerland
- Prior art keywords
- force
- strain
- strain gauges
- pressed
- sensors
- Prior art date
Links
- 239000012528 membrane Substances 0.000 title claims abstract description 6
- 238000002347 injection Methods 0.000 title description 2
- 239000007924 injection Substances 0.000 title description 2
- 238000001746 injection moulding Methods 0.000 title description 2
- 238000005452 bending Methods 0.000 title 1
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 6
- 239000010959 steel Substances 0.000 claims abstract description 6
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- 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
- G01L1/2231—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being disc- or ring-shaped, adapted for measuring a force along a single direction
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
-
- 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
- G01L1/2287—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 constructional details of the strain gauges
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
Description
[0001] Die vorliegende Erfindung bezieht sich auf eine Lastdose gemäss dem einleitenden Teil des unabhängigen Anspruches. The present invention relates to a load box according to the introductory part of the independent claim.
[0002] An Kunststoff-Spritzgiessmaschinen ist die Messung der Einspritzkraft immer wichtiger. Zur Messung dieser Kräfte werden mit Dehnungsmessstreifen beklebte Lastdosen hinter der Schnecke angebracht. At plastic injection molding machines, the measurement of the injection force is more important. To measure these forces, strain gauges pasted with strain gauges are placed behind the screw.
[0003] Oft werden Membran-Lastdosen verwendet, welche 4 oder 8 geklebte Dehnungsmessstreifen aufweisen. Es können aber auch zylindrische Kompressionslastdosen zum Einsatz kommen. Often membrane load boxes are used, which have 4 or 8 bonded strain gauges. But it can also be used cylindrical compression load cans.
[0004] All diesen Lastdosen ist eigen, dass die Dehnungsmessstreifen in aufwendigen Verfahren von Spezialisten aufgebracht werden müssen. Ausserdem ist für jeden Maschinentyp eine speziell dimensionierte Lastdose zu entwickeln. Die Spedition dieser schweren Maschinenbauteile vom Betrieb welcher die Dehnungsmessstreifen klebt zum Maschinenhersteller ist aufwendig. Ausserdem muss im Schadensfall die ganze Lastdose, welche Bestandteil der Produktionsmaschine ist, ausgewechselt werden. Dies dauert in der Regel sehr lange und die Maschine kann in dieser Zeit nicht produzieren. All these load doses is peculiar that the strain gauges must be applied by specialists in complex procedures. In addition, a specially dimensioned load cell has to be developed for each machine type. The forwarding of these heavy machine components from the company which the strain gauges sticks to the machine manufacturer is expensive. In addition, in case of damage, the entire load box, which is part of the production machine, must be replaced. This usually takes a long time and the machine can not produce during this time.
[0005] Ziel der Erfindung ist es, diese Nachteile zu vermeiden. Erfindungsgemäss wird dies mit Lastdosen der eingangs erwähnten Art durch die Merkmale des unabhängigen Anspruches erreicht. The aim of the invention is to avoid these disadvantages. According to the invention this is achieved by load cells of the type mentioned by the features of the independent claim.
[0006] Die erfindungsgemässen Lastdosen bestehen im Wesentlichen aus dem Stahlkörper mit einer Messmembrane und Aufpress-Dehnungssensoren welche in der CH Patentnummer 697 545 beschrieben sind. Diese Aufpress-Dehnungssensoren werden in eine axial eingefräste Nut geschraubt und so stark angepresst dass die Dehnungsmessstreifen dieselbe Funktion wie aufwendig geklebte Dehnungsmessstreifen erfüllen. Allerdings kann der Dehnungsmessstreifen auf Kundenebene angeschraubt werden, und der Lastdosenkörper kann vom Kunden hergestellt werden. Der Dehnungsmessstreifen ist im Schadensfall ohne erneute Kalibration auswechselbar, und der Lastdosenkörper kann direkt vom Maschinenhersteller gefertigt werden, ohne dass die Stahlteile verschickt werden müssen. Zusätzlich ist die Lagerhaltung erleichtert, da nur ein Sensortyp für alle Maschinentypen verwendet werden kann. The load boxes according to the invention essentially consist of the steel body with a measuring diaphragm and compression-strain sensors which are described in Swiss Patent No. 697,545. These press-fit strain sensors are screwed into an axially milled groove and pressed so hard that the strain gauges perform the same function as elaborately bonded strain gauges. However, the strain gauge can be bolted to customer level, and the load can body can be made by the customer. The strain gauge can be replaced in the event of damage without recalibration, and the load can body can be manufactured directly by the machine manufacturer without having to ship the steel parts. In addition, warehousing is facilitated because only one type of sensor can be used for all machine types.
[0007] Keiner der bisher bekannten Lastdosen kann all diese vorteilhaften Eigenschaften in sich vereinen. None of the previously known load boxes can combine all these advantageous properties in itself.
[0008] Die Erfindung wird nun anhand einer Zeichnung näher erläutert. Dabei zeigt: <tb>Fig. 1<sep>einen Querschnitt einer bevorzugten Ausführungsform der Lastdose mit Aussenansicht der aufgebrachten Aufpress-DehnungssensorenThe invention will now be explained in more detail with reference to a drawing. Showing: <Tb> FIG. 1 <sep> is a cross section of a preferred embodiment of the load box with an external view of the applied press-on strain sensors
[0009] Gleiche Bezugszeichen bedeuten in allen Figuren gleiche Einzelheiten. The same reference numerals mean the same details in all figures.
[0010] Eine erfindungsgemässe Lastdose nach Fig. 1besteht aus einem Lastdosen-Stahlkörper in Form eines Ringes wie er in der Messtechnik sehr häufig anzutreffen ist. Dieser Lastdosen-Stahlkörper 9 welcher am verdickten Umfang 2 auf einen Support oder Gehäuse 1 geschraubt ist wird am verdickten inneren Ring 10 mit der Kraft 5 beaufschlagt. Dadurch biegt sich die relativ dünne Membrane 8 im sogenannten S-Schlag in der Art, dass die Dehnungsmessstreifen 6 gestreckt werden, und die Dehnungsmessstreifen 7 gestaucht werden. Diese Dehnungsmessstreifen können nun in bekannter Art in einer Vollbrückenschaltung verschaltet werden und erzeugen der Kraft 5 proportionale Signale. Die Dehnungsmessstreifen 6 und 7 sind Erfindungsgemäss nicht geklebt sondern mittels den Sensoren 3 und den Schrauben 4 in die Nute 11 geschraubt womit die Dehnungsmessstreifen 6 und 7 fest angepresst werden und wie aufgeklebte Dehnungsmessstreifen verwendet werden können. Die Aufpress-Dehnungssensoren 3 können bereits eine Verstärkerelektronik enthalten. 1 according to the invention consists of a load can steel body in the form of a ring as it is very common in metrology. This load can steel body 9 which is screwed on a thickened circumference 2 on a support or housing 1 is applied to the thickened inner ring 10 with the force 5. As a result, the relatively thin diaphragm 8 bends in the so-called S-stroke in such a way that the strain gauges 6 are stretched, and the strain gauges 7 are compressed. These strain gauges can now be connected in a known manner in a full bridge circuit and generate the force 5 proportional signals. The strain gauges 6 and 7 are not glued according to the invention but screwed by means of the sensors 3 and the screws 4 in the groove 11 so that the strain gauges 6 and 7 are pressed firmly and how glued strain gauges can be used. The press-on strain sensors 3 may already contain an amplifier electronics.
[0011] Es können 1, 2 oder mehrere Aufpress-Dehnungssensoren 3 auf die Membrane 8 geschraubt werden. It can be screwed onto the membrane 1 1, 2 or more press-on strain sensors 3.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH10622009A CH701412B1 (en) | 2009-07-08 | 2009-07-08 | Load cell. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH10622009A CH701412B1 (en) | 2009-07-08 | 2009-07-08 | Load cell. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CH701412A2 true CH701412A2 (en) | 2011-01-14 |
| CH701412B1 CH701412B1 (en) | 2014-02-28 |
Family
ID=43466235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH10622009A CH701412B1 (en) | 2009-07-08 | 2009-07-08 | Load cell. |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH701412B1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105280859A (en) * | 2015-09-24 | 2016-01-27 | 奇瑞汽车股份有限公司 | Collision protection structure of battery system of electric vehicle, assembling method and detaching method for collision protection structure |
| WO2016170315A1 (en) * | 2015-04-21 | 2016-10-27 | Cambridge Medical Robotics Ltd | Load cells in an instrument drive |
-
2009
- 2009-07-08 CH CH10622009A patent/CH701412B1/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016170315A1 (en) * | 2015-04-21 | 2016-10-27 | Cambridge Medical Robotics Ltd | Load cells in an instrument drive |
| CN105280859A (en) * | 2015-09-24 | 2016-01-27 | 奇瑞汽车股份有限公司 | Collision protection structure of battery system of electric vehicle, assembling method and detaching method for collision protection structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CH701412B1 (en) | 2014-02-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCOW | Change of address of patent owner(s) |
Free format text: NEW ADDRESS: STEIGWEG 8, 8355 AADORF (CH) |
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| NV | New agent |
Representative=s name: HEPP WENGER RYFFEL AG, CH |
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| PK | Correction |
Free format text: BERICHTIGUNG INHABER |
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| PL | Patent ceased |