DE2950337A1 - Tension measuring appts. for cable laying equipment - has sensing cell and signal converting circuits mounted on insulation plate - Google Patents

Tension measuring appts. for cable laying equipment - has sensing cell and signal converting circuits mounted on insulation plate

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Publication number
DE2950337A1
DE2950337A1 DE19792950337 DE2950337A DE2950337A1 DE 2950337 A1 DE2950337 A1 DE 2950337A1 DE 19792950337 DE19792950337 DE 19792950337 DE 2950337 A DE2950337 A DE 2950337A DE 2950337 A1 DE2950337 A1 DE 2950337A1
Authority
DE
Germany
Prior art keywords
cable
converter
tension measuring
board
strip
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.)
Granted
Application number
DE19792950337
Other languages
German (de)
Other versions
DE2950337C2 (en
Inventor
Ing.(grad.) Lutz Giehmann
Ing.(grad.) Klaus Gottwald
Wilfried 1000 Berlin Jacobi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Kommunikations Industrie AG
Original Assignee
Felten & Guilleaume 5000 Koeln GmbH
Felten and Guilleaume Carlswerk AG
Felten and Guilleaume AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Felten & Guilleaume 5000 Koeln GmbH, Felten and Guilleaume Carlswerk AG, Felten and Guilleaume AG filed Critical Felten & Guilleaume 5000 Koeln GmbH
Priority to DE19792950337 priority Critical patent/DE2950337C2/en
Publication of DE2950337A1 publication Critical patent/DE2950337A1/en
Application granted granted Critical
Publication of DE2950337C2 publication Critical patent/DE2950337C2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
    • H02G1/06—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle
    • H02G1/08—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle through tubing or conduit, e.g. rod or draw wire for pushing or pulling
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
    • G01L5/10—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means
    • G01L5/101—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means using sensors inserted into the flexible member

Abstract

The continuous tension measuring apparatus is connected between the cable and the pulling or laying machine, and is used to provide a feedback signal for controlling the latter. The apparatus comprises an insulation plate (2) to which are attached coupling ends (4a,4b) for connecting it between the cable and the machine. The plate is typically an epoxy resin bonded woven glass fibre laminate. It carries the tension sensing cell (3), for example a strain gauge, and also the signal processing and amplification circuit (1). The latter is built up on the plate in printed circuit form. Printed connections may also be used between the cell (3) and the circuit (1). To calibrate the cell (3) parts of the edge (8) of the plate can be trimmed away. With the proposed construction a compact and relatively interference free unit can be produced.

Description

Anordnung zur kontinuierlichen Messung von ZugkräftenArrangement for continuous measurement of tensile forces

Die Erfindung betrifft eine Anordnung zur kontinuierlichen Messung der Zugkraft, die in einem Kabel während seines Einziehens in Kabelkanäle oder -rohre auftritt, nach dem Oberbegriff des Anspruchs 1.The invention relates to an arrangement for continuous measurement the tensile force in a cable while it is being pulled into cable ducts or ducts occurs, according to the preamble of claim 1.

Diese Anordnung eignet sich allgemein zur Messung von Zugkräften an unzugänglichen Stellen mit Ubertragung der Meßsignale an einen Beobachtungsort. Eine Anwendungsmöglichkeit entsteht unter anderem beim Einziehen von Kabeln in vorbereitete Kabelkanäle. Insbesondere beim Einziehen von Kabeln, die Lichtleitfasern enthalten, kann es wegen deren Zugempfindlichkeit wichtig sein, die auf den Kabelanfang wirksamen Zugkräfte zu messen und zu registrieren.This arrangement is generally suitable for measuring tensile forces inaccessible places with transmission of the measurement signals to an observation site. One possible application arises, among other things, when pulling cables into prepared ones Cable channels. Especially when pulling in cables that contain optical fibers, It can be important because of their tensile sensitivity that have an effect on the beginning of the cable Measure and register tensile forces.

Eine für diese Zwecke geeignete Anordnung mit einem Zugmeßkopf zwischen dem Zugseil und dem Kabel ist in der Hauptanmeldung P 29 OO 770.3 eingehend beschrieben. Für die Umformung von Kräften in elektrische Meßsignale werden hier handelsübliche Umformer, beispielsweise Meßdosen mit Dehnungsmeßstretfen im Zugmeßkopf angeordnet, deren elektrische Signale im Zugmeßkopf für die Ubertragung aufbereitet werden.A suitable arrangement for these purposes with a tension measuring head between the pull rope and the cable is described in detail in the main application P 29 OO 770.3. For the conversion of forces into electrical measurement signals, commercially available Transducers, for example load cells with strain gauges arranged in the tensile measuring head, whose electrical signals are processed in the tension measuring head for transmission.

Die Auswahl, Beschaffung, der Einbau und Abgleich von handelsüblichen Meßdosen in den Zugmeßkopf für die verschiedenen Anwendungszwecke kann Probleme aufwerfen. Hinzu kommt, daß die Verbindungsleitungen zwischen Meßdose und Signalwandler sehr störungsanfällig sind.The selection, procurement, installation and comparison of commercially available Load cells in the tension measuring head for various purposes can cause problems raise. In addition, the connecting lines between the load cell and the signal converter are very prone to failure.

Der Erfindung liegt die Aufgabe zugrunde, den Meßaufbau im Zugmeßkopf zu vereinfachen, kostengünstçer zu gestalten und seine Störanfälligkeit zu vermindern.The invention is based on the object of the measurement structure in the tensile measuring head to simplify, to design more cost-effectively and to reduce its susceptibility to failure.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Signalwandler als gedruckte Schaltung auf einer Platine aufgebaut ist, daß der Umformer auf der gleichen Platine angeordnet ist, und daß diese Platine zur Aufnahme der zu messenden Kräfte mechantsch mit Kraftübertragungs-Elementen verbunden ist.This object is achieved according to the invention in that the signal converter is constructed as a printed circuit on a circuit board that the converter on the the same board is arranged, and that this board for receiving the to be measured Forces is mechanically connected to power transmission elements.

Ausgestaltungen der Erfindung sind in den Ansprüchen 2 bis 4 angegeben.Refinements of the invention are specified in claims 2 to 4.

Ein AusfUhrungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben. Es zeigen: Fig. 1 einen Zugmeßkopf, geöffnet, 0 Fig. 2 den gleichen Kopf, um 90 um seine Längsachse gedreht.An exemplary embodiment of the invention is shown in the drawing and is described in more detail below. They show: FIG. 1 a tension measuring head, open, 0 Fig. 2 shows the same head, rotated 90 about its longitudinal axis.

In den Figuren 1 und 2 ist ein Zugmeßkopf einer Anordnung zur kontinuierlichen Messung von Zugkräften in zwei um 900 gegeneinander verdrehten Ansichten schematisch im Aufbau dargeStellt. Der von den elektrischen Bauteilen des Signalwandlers 1 eingenommene Raum ist in Fig. 1 durch eine unterbrochene Linie angedeutet. Die elektrische Verbindung der Teile untereinander geschieht durch eine gedruckte Schaltung, die auf einer Platine 2 aufgebracht ist. Auf der gleichen Platine ist auch der Umformer 3 angeordnet und mit dem in seiner unmittelbaren Nähe liegenden Signalwandler verbunden.In Figures 1 and 2 is a tension measuring head of an arrangement for continuous Measurement of tensile forces in two views rotated by 900 against each other, schematic shown under construction. The amount occupied by the electrical components of the signal converter 1 Space is indicated in Fig. 1 by a broken line. The electrical connection the parts between each other is done by a printed circuit that is on a Board 2 is applied. The converter 3 is also arranged on the same board and with the in signal converter located in the immediate vicinity tied together.

Der Umformer 3 kann, wie im Beispiel angedeutet, aus Dehnungsmeßstreifen (DMS), aber auch aus kapazitiven oder induktiven Wegumformern bestehen. Die Platine 2 ist vorteilhafterweise als Streifen eines faserverstärkten Kunstha-zes gestaltet, beispielsweise als glasfaserverstärkte Epoxydharzplatte, die für die Herstellung der gedruckten Schaltung teilweise kupferbeschichtet ist. Die schwingungsdämpfenden Materialeigenschaften derartiger gewebeverstärkter Kunstharzplatten als Trägermaterial für einen Weg-Widerstandsumformer ergibt eine resonanzarme Ubertragungscharakteristik bei der Umwandlung von schnellen Kraftänderungen in elektrische Widerstandsänderungen. Bei dieser Anordnung entfällt eine zusätzliche Meßdose und ihre Verbindung mit den Kraftübertragungselemengen 4a und 4b. Weiterhin ergibt sich dabei durch die äußerst kurzen Verbindungsleitungen zwischen Umformer und Signalwandler eine gute Störfestigkeit. Die Enden 6a und 6b der Platine 2 sind in geeigneter Weise mit je zwei Metallstreifen 5a und 5b verstärkt, wodurch die Lastverteilung aus den Kraftübertragungselementen 4 in die Platine 2 wesentlich verbesser werden kann. Es hat sich als vorteilhaft herausgestellt, vor dem Abgleich der Meßanordnung eine Reihe von Lastwechseln Uber die Kraftübertragungs-Elemente 4 in die Platine 2 einzuleiten, diese also vorzurecken. Das geschieht zweckmäßig nach dem Aufbringen der Teile des Umformers 3 und dem Zusammenbau der Teile des Signalwandlers 1. Eine derartig vorbehandelte Platine zeigt gute Langzeit-Konstanz in ihren Meßwerten. Eine Anpassung einer Platine 2 mit aufgebrachten Umformern 3 an bestimmte zu übertragende oder zu überwachende Kraftwerte kann dadurch erfolgen, daß die Längsseiten 7 der Platine im Bereich des Umformers 3 Ausnehmungen 8 erhalten. Durch weitere Vertiefung dieser Ausnehmungen 8 ist ein weitgehender Abgleich der Anordnung möglich.As indicated in the example, the converter 3 can consist of strain gauges (DMS), but also consist of capacitive or inductive position transducers. The board 2 is advantageously designed as a strip of fiber-reinforced synthetic resin, for example as a glass fiber reinforced epoxy resin board, which is used for the production the printed circuit is partially copper-coated. The vibration dampening Material properties of such fabric-reinforced synthetic resin panels as a carrier material for a displacement resistance converter results in a low-resonance transmission characteristic in the conversion of rapid changes in force into changes in electrical resistance. With this arrangement there is no need for an additional load cell and its connection to the Power transmission elements 4a and 4b. Furthermore, it results from the extremely short connecting lines between the converter and the signal converter ensure good immunity to interference. The ends 6a and 6b of the board 2 are suitably provided with two metal strips each 5a and 5b reinforced, whereby the load distribution from the power transmission elements 4 in the board 2 can be significantly improved. It has been found to be beneficial turned out to be a series of load changes Uber before the calibration of the measuring arrangement to initiate the power transmission elements 4 into the plate 2, that is, to advance it. This is expediently done after the parts of the converter 3 have been applied and assembled of the parts of the signal converter 1. A board pretreated in this way shows good long-term constancy in their readings. An adaptation of a circuit board 2 with applied converters 3 to certain force values to be transmitted or monitored can be done by that the longitudinal sides 7 of the board in the region of the converter 3 receive recesses 8. By deepening these recesses 8, an extensive comparison of the Arrangement possible.

Die für den Aurbau des Signalwandlers 1 erforderlichen Leiterbahnen auf der Platine 2 wie auch die Verbindung des Signalwandlers 1 mit dem Umformer 3 kann in allen für die Herstellung von gedruckten Schaltungen oder von integrierten Schaltkreisen üblichen Techniken erfolgen. In Sonderfällen ist es auch möglich, beispielsweise die Dehnungsmeßstreifen des Umformers 3 in der gleichen Technik auf die Platine 2 aufzubringen wie die Leiterbahnen. In den Figuren ist eine die Platine 2 umgebende Schutzhülle nicht dargestellt worden.The conductor tracks required for the construction of the signal converter 1 on the circuit board 2 as well as the connection of the signal converter 1 with the converter 3 can be used in all for the manufacture of printed circuit boards or integrated Circuits using conventional techniques. In special cases it is also possible for example, the strain gauges of the converter 3 in the same technology to apply the circuit board 2 like the conductor tracks. In the figures, one is the circuit board 2 surrounding protective cover has not been shown.

Bei ihrer Befestigung an einem der Kraftübertragungselemente 4a oder 4b muß beachtet werden, daß die Schutzhülle die Bewegung des Jeweils anderen Elementes 4 und damit die Dehnung der Platine 2 nicht behindert.When they are attached to one of the force transmission elements 4a or 4b it must be noted that the protective cover prevents the movement of the respective other element 4 and thus the expansion of the board 2 is not hindered.

Claims (4)

Patentansprüche: Anordnung zur kontinuierlichen Messung der Zugkraft, die in einem Kabel während seines Einziehens in Kabelkanäle oder -rohre auftritt und in einem zwischen Kabel und Zugseil angeordneten Zugmeßkopf gemessen wird, wobei im Zugmeßkopf ein Umformer angeordnet ist, der die gemessene Zugkraft in ein elektrisches Meßwertsignal umformt, und zusätzlich ein Signalwandler, der das Meßwertsignal laufend in ein störfrei vom Zugmeßkopf zum Auswerteort hin übertragbares Mesignal umwandelt, nach Patentanmeldung P 29 00 770.D, d a d u r c h g e -k e n n z e i c h n e t, daß der Signalwandler (1) als gedruckte Schaltung auf einer Platine (2) aufgebaut ist, daß der Umformer (3) auf der gleichen Platine (2) angeordnet ist, und daß diese Platine (2) zur Aufnahme der zu messenden Kräfte mechanisch mit Kraftübertragungs-Elementen (4) verbunden ist. Claims: arrangement for continuous measurement of the tensile force, which occurs in a cable while it is being pulled into cable ducts or ducts and is measured in a tension measuring head arranged between the cable and the tension cord, wherein A transducer is arranged in the tensile measuring head, which converts the measured tensile force into an electrical The measured value signal is converted, and in addition a signal converter that continuously converts the measured value signal converts it into a measurement signal that can be transmitted from the tension measuring head to the evaluation location without interference, according to patent application P 29 00 770.D, d a d u r c h g e -k e n n z e i c h n e t, that the signal converter (1) constructed as a printed circuit on a circuit board (2) is that the converter (3) is arranged on the same board (2), and that this Board (2) for recording the forces to be measured mechanically with force transmission elements (4) is connected. 2. Anordnung nach Anspruch 1, d a d u r c h g e -k e n n z e i c h n e t, daß die Platine (2) als Streifen aup einem faserverstärkten Kunstharz gestaltet ist, und daß die beiden Enden (6a, 6b) des Streifens (2) zur Lastverteilung durch fest mit den Enden (6a, 6b) verbundene Metallauflagen (5a, 5b) verstärkt sind 2. Arrangement according to claim 1, d a d u r c h g e -k e n n z e i c h n e t that the circuit board (2) is designed as a strip made of a fiber-reinforced synthetic resin is, and that the two ends (6a, 6b) of the strip (2) for load distribution through metal supports (5a, 5b) firmly connected to the ends (6a, 6b) are reinforced 3. Anordnung nach Anspruch 1 oder ,', d a d u r c h g e -k e n n z e t c h n e t, daß der Streifen (2) nach dem Aufbringen aller vorgesehenen Bauteile (1, 3, 5) vorgereckt ist.3. Arrangement according to claim 1 or, ', d a d u r c h g e -k e n n z e t c h n e t that the strip (2) is pre-stretched after all the intended components (1, 3, 5) have been applied is. 4. Anordnung nach einem der Ansprüche 1 bis 3, d a -d u r c h g e k e n n z e i c hn e t, daß an den Längsseiten (7) des Streifens (2) im Bereich des Umformers (3) Ausnehmungen (8) für den Abgleich der Anordnung eingeformt sind.4. Arrangement according to one of claims 1 to 3, d a -d u r c h g e It is not possible to say that on the long sides (7) of the strip (2) in the area of the converter (3) recesses (8) are formed for the adjustment of the arrangement.
DE19792950337 1979-12-14 1979-12-14 Arrangement for continuous measurement of tensile forces Expired DE2950337C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19792950337 DE2950337C2 (en) 1979-12-14 1979-12-14 Arrangement for continuous measurement of tensile forces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19792950337 DE2950337C2 (en) 1979-12-14 1979-12-14 Arrangement for continuous measurement of tensile forces

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DE2950337A1 true DE2950337A1 (en) 1981-06-19
DE2950337C2 DE2950337C2 (en) 1986-10-23

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2541454A1 (en) * 1982-05-18 1984-08-24 Laborderie Alain Device for measuring mechanical stresses undergone by a telecommunications cable when it is placed in an underground network
GB2537342A (en) * 2015-01-21 2016-10-19 Slingco Ltd Load Sensor
WO2019233531A1 (en) * 2018-06-06 2019-12-12 Huesker Synthetic Gmbh Method for load monitoring and for determining the operational life of bodies of ground reinforced with geosynthetic materials

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005056610A1 (en) * 2005-11-28 2007-05-31 Siemens Ag Parking brake cable`s tractive force determining method for motor vehicle, involves connecting sensor support with longitudinal sensor whose signal voltage depends on elongation and parameter of force, and determining force from voltage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NICHTS-ERMITTELT *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2541454A1 (en) * 1982-05-18 1984-08-24 Laborderie Alain Device for measuring mechanical stresses undergone by a telecommunications cable when it is placed in an underground network
GB2537342A (en) * 2015-01-21 2016-10-19 Slingco Ltd Load Sensor
GB2537342B (en) * 2015-01-21 2020-04-08 Slingco Ltd Load Sensor
WO2019233531A1 (en) * 2018-06-06 2019-12-12 Huesker Synthetic Gmbh Method for load monitoring and for determining the operational life of bodies of ground reinforced with geosynthetic materials

Also Published As

Publication number Publication date
DE2950337C2 (en) 1986-10-23

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