CA1326593C - Device for measuring the deflection of elongate components - Google Patents
Device for measuring the deflection of elongate componentsInfo
- Publication number
- CA1326593C CA1326593C CA000606823A CA606823A CA1326593C CA 1326593 C CA1326593 C CA 1326593C CA 000606823 A CA000606823 A CA 000606823A CA 606823 A CA606823 A CA 606823A CA 1326593 C CA1326593 C CA 1326593C
- Authority
- CA
- Canada
- Prior art keywords
- receiving unit
- elongate component
- deflection
- component
- transmitting
- 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.)
- Expired - Fee Related
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Paper (AREA)
- Traffic Control Systems (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
ABSTRACT
The invention concerns a device for determining the distortions of elongate components with a longitudinal axis. The invention is characterized by a transmitter of electromagnetic radiation including light waves, which at least in an axially parallel plane approximately in the center (at one-half of its length) of the component is attached to its outside or firmly connected with it, and through pickups for the electromagnetic radiation, including light waves, that are arranged in the same axial line with these, outside on the ends of the component, the sensor surface of which pickups, sensitive to the radiation, features sensor elements which are distributed in the way of a faceted eye.
The invention concerns a device for determining the distortions of elongate components with a longitudinal axis. The invention is characterized by a transmitter of electromagnetic radiation including light waves, which at least in an axially parallel plane approximately in the center (at one-half of its length) of the component is attached to its outside or firmly connected with it, and through pickups for the electromagnetic radiation, including light waves, that are arranged in the same axial line with these, outside on the ends of the component, the sensor surface of which pickups, sensitive to the radiation, features sensor elements which are distributed in the way of a faceted eye.
Description
2 ~ 5 9 3 -`` DEVICE FOR MEASURING THE DEFLECTION OF ELONGATE COMPONENTS
.~:
; The invention concerns a device for measuring the deflection ` of elongate components, specifîcally of a beam supported on both ends, such as a support beam for the scraper blade of a paper coater or for the upper lip of a paper machine headbox.
, Elongate components in various machine construction areas, specifically support ~eams which are preferably formed of metal, often are subject to stress by static forces, but also are subject to stresses by thermal forces due to temperature differences. The latter often lead to heavy distortions of elongate components.
,; .
The problem underlying the invention is to determine the extent of these distortions or deflections. This problem is inventionally solved by the features of the present invention in a device of the type initially cited above.
"j .
A device for measuring the deflection of an elongate component with a longitudinal axis, specifically a beam supported on both ends, includes a transmitting unit which is firmly connected wi'h the outside of the elongate component in approxlmately the center thereof, which transmitting unit emits sharply focused electromagnetic radiation. A receiving unit responsive to electro~agnetic radiation is arranged in axial alignment with the transmitting unit outside on the ends of the elongate component, and has a sensor surface sensitive to the radiation and including at least one row of sensor elements which are distributed in the manner of a faceted eye, with the row extending in the direction of the deflection.
.- .
~ 326593 The invention will be explained hereafter with the aid of ~he embodiment illustrated in the drawings.
Fig. 1 is an elevational view of an elongate component incorporating an ~mbodiment of the present invention.
Fig. 2 is a diagrammatic sketch showing the conditions of deflection of the elongate component of Fig. 1.
,~
Referring to FIGS. 1 and 2, the beam 1 sketched as an elongate component rests on lateral supports 2 and 3. As :
indicated, its straight axis C, indicated by the dash-dot line, ;~ is deflected by mechanical defects so as to form the axis C' ~ indicated by the dash-double dot line. Installed on the beam . .
through the intermediary of brackets, in its center, i.e., at one-half of its length, is a transmitting unit 4 for electromagnetic radiation or light, including laser light, and on the two ends of the beam, receiving units (pickup 5 and 6) for the electromagnetic radiation or light. The electromagnetic radiation or light is indicated by the arrows marked L. The pickups have a sensor surface on which sensor elements 5' or 6' are distributed ln the way of a faceted eye. These are able to determine the degree of center axis distortion according to the distorted center axis C', on the basis of the inclination of the rays L that exists then relative to the undistorted center axis C. There may as well be provided only a single row of sensor elements, as can be seen from Fig. 2, if the plane of deflection is clearly known to begin with.
The respective l'zero sensor", which is located in the origin of the x-y coordinate cross, i.e., in the zero point of the y-axis, is marked 15 and 16, respectively. The scale in the ,. ,:, , , ~ , direction of the y-axis is consi~e~b~9enlarged here relative to the length, along the "zero sensor plane" E.
The measured values of the various receivers arranged on the two ends of the elongate component or beam are preferably added and the result is divided by two. In this way, a good measure for the actual deflection is obtained also in the case of an asymmetric deflection, according to Fig. 2. Employed to that end ,,.
is a summing device 11, which may be designed also as an averaging device. Here, the signal Y 1 = + 6, the signal Y 2 = - 1, thus, one-half the sum is 2.5.
Thermal stresses can preferably be precluded by providing the beam with cooling channels or heating channels, which are provided within it or on its outside. A slight localized distortion of the beam in the csnter area, however, where the receiver(s) are preferably applied, is compensated for in the measuriny result by the proposed arrangement. Resulting from such distortions ~plate distortion) of the beam is a slanted arrangement of the transmltter which, however, essentially leads to equally large measuring results of opposite sign, of a faked beam de~lection, which offset one another through the summation.
Suitable as sensor elements of the pickups 5 and 6 are preferably light-sensitive diodes and it is recommended that the transmitter 4, respectively 4', operate with laser light.
For the "simple" case of a symmetric deflection according to Fig~ 1, one transmitting unit (for instance the right-hand unit 4 in Fig. 2) is frequently sufficient, and consequently also only one receiver unit ~unit 6 in Fig. 1 or, alternatively, also transmitting unit 4' of Fig. 2 and receiving unit 5 in Fig. 1).
For a trouble free operation, naturally, it is favorable to arrange the signal devices within a sheet metal cover 10 attached to the elongate component or beam 1. The one receiver circuit -: .. . , ~. .
.: ',; , ~ .
.
~ r evaluation of the receiver signal is marked 8 while the other receiver circuit is marked 9. The transmitters for laser light ~ are supplied by the firm Raytec AG, in Chur/Switz~rland, , 65 Rossbodenstrasse, designated as laser directional measuring instrument. The design of support beams for coating devices can be seen, e.g., fro U.S. Patent No. 4,512,279.
r', ' .
.
',
.~:
; The invention concerns a device for measuring the deflection ` of elongate components, specifîcally of a beam supported on both ends, such as a support beam for the scraper blade of a paper coater or for the upper lip of a paper machine headbox.
, Elongate components in various machine construction areas, specifically support ~eams which are preferably formed of metal, often are subject to stress by static forces, but also are subject to stresses by thermal forces due to temperature differences. The latter often lead to heavy distortions of elongate components.
,; .
The problem underlying the invention is to determine the extent of these distortions or deflections. This problem is inventionally solved by the features of the present invention in a device of the type initially cited above.
"j .
A device for measuring the deflection of an elongate component with a longitudinal axis, specifically a beam supported on both ends, includes a transmitting unit which is firmly connected wi'h the outside of the elongate component in approxlmately the center thereof, which transmitting unit emits sharply focused electromagnetic radiation. A receiving unit responsive to electro~agnetic radiation is arranged in axial alignment with the transmitting unit outside on the ends of the elongate component, and has a sensor surface sensitive to the radiation and including at least one row of sensor elements which are distributed in the manner of a faceted eye, with the row extending in the direction of the deflection.
.- .
~ 326593 The invention will be explained hereafter with the aid of ~he embodiment illustrated in the drawings.
Fig. 1 is an elevational view of an elongate component incorporating an ~mbodiment of the present invention.
Fig. 2 is a diagrammatic sketch showing the conditions of deflection of the elongate component of Fig. 1.
,~
Referring to FIGS. 1 and 2, the beam 1 sketched as an elongate component rests on lateral supports 2 and 3. As :
indicated, its straight axis C, indicated by the dash-dot line, ;~ is deflected by mechanical defects so as to form the axis C' ~ indicated by the dash-double dot line. Installed on the beam . .
through the intermediary of brackets, in its center, i.e., at one-half of its length, is a transmitting unit 4 for electromagnetic radiation or light, including laser light, and on the two ends of the beam, receiving units (pickup 5 and 6) for the electromagnetic radiation or light. The electromagnetic radiation or light is indicated by the arrows marked L. The pickups have a sensor surface on which sensor elements 5' or 6' are distributed ln the way of a faceted eye. These are able to determine the degree of center axis distortion according to the distorted center axis C', on the basis of the inclination of the rays L that exists then relative to the undistorted center axis C. There may as well be provided only a single row of sensor elements, as can be seen from Fig. 2, if the plane of deflection is clearly known to begin with.
The respective l'zero sensor", which is located in the origin of the x-y coordinate cross, i.e., in the zero point of the y-axis, is marked 15 and 16, respectively. The scale in the ,. ,:, , , ~ , direction of the y-axis is consi~e~b~9enlarged here relative to the length, along the "zero sensor plane" E.
The measured values of the various receivers arranged on the two ends of the elongate component or beam are preferably added and the result is divided by two. In this way, a good measure for the actual deflection is obtained also in the case of an asymmetric deflection, according to Fig. 2. Employed to that end ,,.
is a summing device 11, which may be designed also as an averaging device. Here, the signal Y 1 = + 6, the signal Y 2 = - 1, thus, one-half the sum is 2.5.
Thermal stresses can preferably be precluded by providing the beam with cooling channels or heating channels, which are provided within it or on its outside. A slight localized distortion of the beam in the csnter area, however, where the receiver(s) are preferably applied, is compensated for in the measuriny result by the proposed arrangement. Resulting from such distortions ~plate distortion) of the beam is a slanted arrangement of the transmltter which, however, essentially leads to equally large measuring results of opposite sign, of a faked beam de~lection, which offset one another through the summation.
Suitable as sensor elements of the pickups 5 and 6 are preferably light-sensitive diodes and it is recommended that the transmitter 4, respectively 4', operate with laser light.
For the "simple" case of a symmetric deflection according to Fig~ 1, one transmitting unit (for instance the right-hand unit 4 in Fig. 2) is frequently sufficient, and consequently also only one receiver unit ~unit 6 in Fig. 1 or, alternatively, also transmitting unit 4' of Fig. 2 and receiving unit 5 in Fig. 1).
For a trouble free operation, naturally, it is favorable to arrange the signal devices within a sheet metal cover 10 attached to the elongate component or beam 1. The one receiver circuit -: .. . , ~. .
.: ',; , ~ .
.
~ r evaluation of the receiver signal is marked 8 while the other receiver circuit is marked 9. The transmitters for laser light ~ are supplied by the firm Raytec AG, in Chur/Switz~rland, , 65 Rossbodenstrasse, designated as laser directional measuring instrument. The design of support beams for coating devices can be seen, e.g., fro U.S. Patent No. 4,512,279.
r', ' .
.
',
Claims (8)
1. Device for measuring the deflection of an elongate component supported on both ends and having a longitudinal axis, said device comprising:
at least one transmitting unit having means for transmitting a pair of signals each in the form of a sharply focused energy beam, said transmitting unit being connected firmly with the elongate component at approximately the center thereof such that the beams extend in opposite directions essentially parallel to the longitudinal axis of the elongate component and toward the respective ends of me elongate component;
two receiving units each arranged on a respective end of said elongate component and axially aligned with one another and with said transmitting unit, each receiving unit receiving a transmitter signal only from one directionrelative to the ends of the elongate component, each receiving unit having a number of sensors arranged in at least one row, with the row extending in the direction of deflection of the elongate component;
said transmitting and receiving units being arranged such that at a condition of zero detection of the elongate component, each of the transmittedsignals per receiving unit will be received by a zero sensor of the row of sensors of the respective receiving unit, and that at a condition of non-zero detection that receiving unit whose sensor excited by the respective transmitter signal is at agreater distance from the respective zero sensor, relative to the excited sensor of the other receiving unit, emits a correspondingly stronger detection signal; and at least one of either a summing device and an averaging device to sum or average, respectively, the detection signals from each receiving unit in a given direction of deflection.
at least one transmitting unit having means for transmitting a pair of signals each in the form of a sharply focused energy beam, said transmitting unit being connected firmly with the elongate component at approximately the center thereof such that the beams extend in opposite directions essentially parallel to the longitudinal axis of the elongate component and toward the respective ends of me elongate component;
two receiving units each arranged on a respective end of said elongate component and axially aligned with one another and with said transmitting unit, each receiving unit receiving a transmitter signal only from one directionrelative to the ends of the elongate component, each receiving unit having a number of sensors arranged in at least one row, with the row extending in the direction of deflection of the elongate component;
said transmitting and receiving units being arranged such that at a condition of zero detection of the elongate component, each of the transmittedsignals per receiving unit will be received by a zero sensor of the row of sensors of the respective receiving unit, and that at a condition of non-zero detection that receiving unit whose sensor excited by the respective transmitter signal is at agreater distance from the respective zero sensor, relative to the excited sensor of the other receiving unit, emits a correspondingly stronger detection signal; and at least one of either a summing device and an averaging device to sum or average, respectively, the detection signals from each receiving unit in a given direction of deflection.
2. Device according to Claim 1, in which said electromagnetic radiation is laser light.
3. Device according to Claim 1, including two transmitting units arranged back to back at approximately the center of said elongate component, each transmitting unit interacting with only one of said receiving units.
4. Device according to Claim 1, in which each receiving unit includes several juxtaposed rows of sensors arranged as a faceted eye.
5. Device according to Claim 3, in which each receiving unit includes several juxtaposed rows of sensors arranged as a faceted eye.
6. Device according to Claim 5, in which the detection of the component is determined in two directions that are perpendicular to each other.
7. Device for measuring the detection of an elongate component with a longitudinal axis, specifically a beam supported on both ends, comprising:
a transmitting unit which at least in an axially parallel plane, in approximately the center of the component, is firmly connected with the outside of said elongate component, which transmitting unit emits sharply focused electromagnetic radiation;
a receiving unit responsive to electromagnetic radiation which is arranged in axial alignment with said transmitting unit outside on the ends of the elongate component, said receiving unit having a sensor surface sensitive to theradiation and including at least one row of sensor elements which are distributed in the manner of a faceted eye, with the row extending in the direction of the detection; and at least one of either a summing device and an averaging device to sum or average, respectively, the deflection signals from the receiving unit in a given direction of deflection.
a transmitting unit which at least in an axially parallel plane, in approximately the center of the component, is firmly connected with the outside of said elongate component, which transmitting unit emits sharply focused electromagnetic radiation;
a receiving unit responsive to electromagnetic radiation which is arranged in axial alignment with said transmitting unit outside on the ends of the elongate component, said receiving unit having a sensor surface sensitive to theradiation and including at least one row of sensor elements which are distributed in the manner of a faceted eye, with the row extending in the direction of the detection; and at least one of either a summing device and an averaging device to sum or average, respectively, the deflection signals from the receiving unit in a given direction of deflection.
8. Device according to Claim 7, in which said electromagnetic radiation is laser light.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3825415.8-52 | 1988-07-27 | ||
| DE3825415A DE3825415A1 (en) | 1988-07-27 | 1988-07-27 | DEVICE FOR MEASURING THE DEFLECTION OF LONG-STRETCHED COMPONENTS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1326593C true CA1326593C (en) | 1994-02-01 |
Family
ID=6359610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000606823A Expired - Fee Related CA1326593C (en) | 1988-07-27 | 1989-07-27 | Device for measuring the deflection of elongate components |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0352464B1 (en) |
| JP (1) | JPH0752092B2 (en) |
| AT (1) | ATE84143T1 (en) |
| CA (1) | CA1326593C (en) |
| DE (1) | DE3825415A1 (en) |
| ES (1) | ES2037912T3 (en) |
| FI (1) | FI93490C (en) |
| NO (1) | NO174440C (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO942358L (en) * | 1994-06-20 | 1995-12-21 | Hafslund Nycomed As | Device for monitoring electric overhead lines |
| FI4290U1 (en) * | 1999-09-14 | 2000-01-19 | Valmet Corp | Paper machine scraper |
| WO2003004968A1 (en) * | 2001-07-06 | 2003-01-16 | Inventio Ag | Method and device for determining the rectilinearity of guide rails |
| DE10152380A1 (en) | 2001-10-28 | 2003-06-26 | Pieper Siegfried | Device for detecting forces and changes on wheels of rail vehicles |
| US7403294B2 (en) * | 2003-03-07 | 2008-07-22 | Boxboro Systems, Llc | Optical measurement device and method |
| DE102005000610B3 (en) | 2005-01-03 | 2006-09-21 | Kamax-Werke Rudolf Kellermann Gmbh & Co. Kg | Method and device for determining the deflection of a connecting element |
| IT1399824B1 (en) * | 2010-03-29 | 2013-05-03 | Ocn S P A | METHOD FOR MEASURING THE DEGREE OF STRAIGHTNESS OF A METAL BAR AND IMPLEMENTING MACHINE SUCH A METHOD |
| CN102749037B (en) * | 2012-05-17 | 2014-11-05 | 合肥工业大学 | Photoelectric type derrick deflection detection device and detection method thereof |
| JP6027480B2 (en) * | 2013-03-29 | 2016-11-16 | 株式会社日立ハイテクノロジーズ | Trajectory inspection method and apparatus |
| CN107826981B (en) * | 2017-12-04 | 2024-03-22 | 湖北科技学院 | General gantry crane girder disturbance degree monitoring device |
| CN110360927B (en) * | 2019-07-24 | 2020-11-06 | 西南交通大学 | Device and method for quickly measuring deflection of long and large part |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1278758B (en) * | 1964-12-22 | 1968-09-26 | Precitronic | Device for measuring the bending and torsional loads on a ship |
| DE2043436A1 (en) * | 1970-09-02 | 1972-03-09 | Krupp Gmbh | Device for the automatic determination of a limit value or several values of the load on a structure |
| US4512279A (en) * | 1977-12-22 | 1985-04-23 | Consolidated Papers, Inc. | Paper coating apparatus |
| DE3475955D1 (en) * | 1983-06-21 | 1989-02-09 | Lasercheck Ltd | Position measurement by laser beam |
-
1988
- 1988-07-27 DE DE3825415A patent/DE3825415A1/en active Granted
-
1989
- 1989-06-16 ES ES198989110961T patent/ES2037912T3/en not_active Expired - Lifetime
- 1989-06-16 EP EP89110961A patent/EP0352464B1/en not_active Expired - Lifetime
- 1989-06-16 AT AT89110961T patent/ATE84143T1/en not_active IP Right Cessation
- 1989-07-19 FI FI893482A patent/FI93490C/en not_active IP Right Cessation
- 1989-07-26 NO NO893046A patent/NO174440C/en unknown
- 1989-07-27 CA CA000606823A patent/CA1326593C/en not_active Expired - Fee Related
- 1989-07-27 JP JP1192800A patent/JPH0752092B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| NO174440B (en) | 1994-01-24 |
| JPH0752092B2 (en) | 1995-06-05 |
| FI93490B (en) | 1994-12-30 |
| DE3825415C2 (en) | 1991-10-24 |
| JPH0278905A (en) | 1990-03-19 |
| DE3825415A1 (en) | 1990-04-12 |
| NO893046D0 (en) | 1989-07-26 |
| ES2037912T3 (en) | 1993-07-01 |
| EP0352464B1 (en) | 1992-12-30 |
| NO893046L (en) | 1990-01-29 |
| EP0352464A1 (en) | 1990-01-31 |
| FI893482A (en) | 1990-01-28 |
| FI93490C (en) | 1995-04-10 |
| FI893482A0 (en) | 1989-07-19 |
| NO174440C (en) | 1994-05-04 |
| ATE84143T1 (en) | 1993-01-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |