EP3350461A1 - Device and method for monitoring loosenable bolt-nut connections - Google Patents
Device and method for monitoring loosenable bolt-nut connectionsInfo
- Publication number
- EP3350461A1 EP3350461A1 EP16801370.4A EP16801370A EP3350461A1 EP 3350461 A1 EP3350461 A1 EP 3350461A1 EP 16801370 A EP16801370 A EP 16801370A EP 3350461 A1 EP3350461 A1 EP 3350461A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nut
- bolt
- sensor
- carrier
- magnet
- 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.)
- Withdrawn
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims description 10
- 230000008859 change Effects 0.000 claims abstract description 32
- 125000006850 spacer group Chemical group 0.000 claims description 23
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000004904 shortening Methods 0.000 claims 1
- 230000033001 locomotion Effects 0.000 abstract description 23
- 230000002045 lasting effect Effects 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 6
- 230000006378 damage Effects 0.000 description 5
- 239000002184 metal Substances 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008447 perception Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
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- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
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- 238000001514 detection method Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
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- 238000011179 visual inspection Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
- F16B31/02—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
- G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
Definitions
- retaining rings which are held by means of a securing pin, are widely used for securing screw-retained connections. But also a variety of washers or lock nuts are used. Mechanically they prevent an automatic release of the connections. Due to the force and vibration, which means both a mechanical load for securing and screw connection, it is not sufficient to subject their connection at regular intervals a functional inspection. For easier recognition, the connecting elements are marked in color. A change of the seat becomes visible as a result of the color breakage. Nevertheless, the human error and the strongly fluctuating sense perception from person to person sets narrow limits for reliable control. Therefore, what is required is an independent and automatic electronic check of the connecting elements.
- DE 101 38 261 AI discloses a sensor element that checks the non-positive connection between workpieces to its predetermined requirement and determines whether they do their job in full or only reduced or not at all more fulfilled.
- Proposed is a pressure-sensitive sensor element integrated in the frictional connection of the connection. This monitors the constant force constantly or at predetermined times.
- the sensor element consists of one or more disc springs, which are pressed together by the screw force.
- On the disc springs is a coil, which forms a resonant circuit together with the acting as a capacitor disc springs. Either via a cable connection or a radio link, the excitation of the resonant circuit is triggered from the outside. Even the smallest changes in the capacitance value due to different pressures lead to a very high-resolution change in the natural frequency to be measured.
- a disadvantage of this invention is the arrangement of the sensor element in the frictional connection of the screw, since the force acting on the sensor element forces falsify the measurement result. In addition, it is not distinguished according to whether only the load on the screw changed or whether their connection dissolves.
- DE 40 02 259 AI discloses an invention for the purpose of detecting the unauthorized loosening and unscrewing a screwed nut.
- a monitoring nut is proposed. This has mounted in its interior a monitoring unit consisting of an electrical pressure contact or a torque sensor. The respective signals are detected in a local control device and can be read here or forwarded by this to a central control room.
- the disadvantage of this invention is that the complex sensors must be accommodated in a nut.
- the thread of the female pin must extend beyond the mounting nut so far that the sensor nut can still be permanently attached.
- the main disadvantage is the indirect significance of the measurement result. From the movement of the monitored mother is closed to a movement of the mounting nut to be measured. A direct detection of the monitored mother does not succeed.
- WO 2005/021983 AI proposes a sensor device for determining the loosening of screws and nuts.
- the arrangement consists of a detector that the Release the bolts / screw connections registered. This is done by measuring a change in position of the screw and nut. The change in position is detected relatively by screw or nut to the workpiece. In this case, a reference point outside the screw is proposed. A clamp without connection to the monitoring screw or nut is mounted so that it aligns the sensor, the power supply as well as a transmitting device on the screw. By a change in position in relation to the sensor housed in the clip, it is determined whether the nut or the bolt have loosened.
- the clip is replaced by a pulled over the screw head hood, which sits directly on the workpiece.
- the disadvantage of this invention is that it always determines the change in position in relation to the workpiece or to the clip. However, if it is to be determined whether a nut is released from the threaded bolt against the pulling direction, the relation to the workpiece is irrelevant. In the case of a uniaxial screw connection, for example, it may happen that the workpiece, together with the nut, turns off the spindle of the bolt without the position of the nut and thread changing relative to one another. Thus, it is not excluded that the loosening of the attachment remains undetected.
- DE 10 2013 218 845 A1 discloses a device for monitoring a flange connection with a monitoring body mounted in positive and / or non-positive engagement on a bolt head or a bolt nut.
- the invention is based on the assumption that in the case of a torn nut or the likewise monitored bolt head, the monitoring body is destroyed. This impairment is sensory detected and passed by signal forwarding to the evaluation.
- the disadvantage of the device is that it only reacts to mechanical damage of bolts and nuts. However, if the bolt winds off the nut without destroying the device, the system will not respond. Only a mechanical destruction as a result of the dissolved flange connection triggers the sensor. However, a connection that does not function properly must be identified in advance and suitable measures must be taken to prevent possible destruction. A process monitoring that registers and reports the loosening of the screw is included DE 10 2013 218 845 AI not provided.
- US 2009 / 0207008A1 discloses a device by means of a magnet and Hall sonsors. It is proposed that the Hall sensor is carried or embedded in the bolt or the nut, according to the magnet is carried or embedded in the nut or in the bolt. If the magnet is mounted in or on the bolt, the invention provides the corresponding sensor in or on the fastening nut.
- the path difference "D" determined by the sensor measures a change in position of the sensor along the bolt. "D” describes in the case of disengagement of the sensor-bearing nut an increasing and in case of further tightening of the nut a decreasing distance parallel to the central axis of the bolt.
- the disadvantage of the invention is obvious. It provides as a fastener before a sensor-bearing mother.
- the mother is thus a special component. This not only has to ensure the fixture; it also contains or carries the sensors. The component thus monitors itself. Failure of the sensor requires either replacement of the attachment element or changes to the sensor-bearing nut. With the dual task perception special structural requirements are to be placed on this component.
- the fastening element is also modified.
- the disadvantage is that the provided according to this invention additional bore on the stability of the mother of influence.
- Another disadvantage is that the sensor is the front side between the mother and component.
- US 2010 0163333 AI discloses a rotational position detecting device. On a rotatable thread, a magnetic or magnet-supporting nut is attached. So that this does not follow the rotational movement of the spindle, it is locked on the side. If the bolt rotates in the thread of the nut, this undergoes a vertical change in position in the axial direction of the bolt. This is registered by a side-mounted sensor.
- the invention further provides for a second magnet located in the tip of the Bolzens is admitted. Opposite him a sensor is provided, which detects only the change in position of the magnetic field embedded in the bolt.
- the disadvantage of this invention is that it provides a relative change from nut to bolt only by offsetting two independent sensor results. For this, the linear change of position in relation to the rotation is considered.
- the device is therefore not intended for monitoring releasable bolt-nut connections, especially since the mother is prevented by a limiting pin on its rotation.
- WO 2005/021983 discloses a detector system for bolted ZMutteritatien, consisting of a capped over the mother cap and an outer protective dome.
- the protective dome is at its base - by way of example is a rim - attached, whereby accidental loosening is prevented.
- radially projecting from the bolt guide elements are arranged, although allow a radial movement, however, prevents axial movement between the cap and the protective dome.
- the metal strips on top of the cap move toward the detector pins. In the case of a contact of metal strip and detector pins a release of the mother is signaled.
- Disadvantage of this invention is the high mechanical complexity consisting of two caps running into one another and the no less high susceptibility of detector bolts and metal strips.
- the invention does not detect relative movement from bolt to nut, but relies on the ratio of nut to base of the point of use. Thus, it limits the use to those connections in which the nut is screwed onto a bolt fixedly connected to the base of the point of use. A loosening of the bolt, in a stuck example, by corrosion, contamination or the like mother will not be registered.
- WO 2013/053758 AI discloses a mother cap with integrated sensor that detects the rotational movement of a nut.
- the nut is connected to the sensor via wires.
- a major disadvantage of this invention is that always only one turn of the nut is detected. A loosening of the bolt in the case of a mother who is watching is not detected.
- the object of the invention is the relative axial rotation of bolt thread and It is preferable for the nut to be experienced during operation and to be directed to a location for outputting measured quantities for monitoring, without affecting the carrying capacity of the bolt connection.
- the object is achieved by a device and a method according to the invention.
- the following description differentiates between nut and bushing.
- the generic term for both is mother (1).
- the nut has an internal thread that can be rotatably mounted on an external thread.
- the socket is slipped over a bolt (2) without thread. It has no internal thread. It is fixed in another way to the bolt (2). This can be done, for example, via a locking screw or a split pin, which is guided transversely to the axial direction through the bush to the bolt (2) fitting or engaging in this.
- the bolt has a screw thread. It is synonymous with the term screw is used.
- the difference between screw and bolt is that the bolt can be turned over the bolt head (13), for example. This does not apply to the bolt. He is firmly mounted. Besides there is a threadless bolt. This comes without screw thread, but can also be provided with grooves and other depressions to ensure improved adhesion of the locking screw.
- Both the unthreaded bolt and the threaded bolt and the bolt are grouped under the generic term bolt (2).
- a basic idea of the inventive method is to detect the relative rotational movement of nut (1) and pin (2). This is understood as an indicator of whether the connection is tight.
- the invention is not limited to the determination of a rotational movement.
- the changing angle of rotation is also available as a result of the continuous measurement.
- the measurement result can be recorded analogously or determined in digital form.
- the resulting technical interruptions of a continuous measurement are negligible due to the tight timing. They do not differ much from analogue data acquisition.
- the rotational angle-dependent measured value acquisition is based on the following idea: When a nut starts to loosen, the statics of the machine are not immediately jeopardized. Due to sufficient safety margins, it may be advantageous, depending on the degree of change observed from nut (1) to bolt (2), to let the machine continue to operate for lack of specific danger or to shut it down in a controlled manner and not rush into expensive emergency stops.
- a magnet (3) is fastened to the bolt (2). This can be done by means of a permanent adhesive. But it is also possible that a recess is provided in the bolt, in which the magnet is clicked and / or inserted. In a further preferred embodiment, the magnet (3) is attached by means of a carrier unit (6).
- a hood (4) is slipped over the bolt (2). This extends down to the mother (1) and enters with this a non-positive connection. Each rotational movement of the nut (1) is thus transmitted directly to the hood (4). As a result, the hood (4) performs the same rotational movement as the nut (1). Contrary to its open end, a magnetically sensitive sensor (8) is installed in the hood (4). This reacts to a change in position of the magnetic field described by the magnet (3). In a preferred embodiment, in addition to the sensor (8) and other electronics (9) housed in the hood. These are temperature and / or motion sensors and / or transmitting / receiving device and / or a power supply.
- the sensor (8) registers any relative rotational movement of bolt (2) to nut (1).
- an automatic shutdown can be initiated.
- a stop of the system may be prompted if suddenly changed values are registered. These can be caused by material failure or mechanical damage to cables and electronics.
- the invention is also suitable for detecting mechanical malfunctions of bolt (2) and nut (1).
- a carrier unit (6) is fixed non-positively on the protruding end of the bolt. She picks up the magnet (3).
- the carrier unit (6) is designed so that the sensor carrier (7) is freely rotatably mounted on it.
- a power supply and, in a further preferred embodiment, a transmitting / receiving device are accommodated on the sensor carrier (7) in addition to the sensor (8). Also can be accommodated here temperature and movement sensor.
- a driver (10) is provided on the outer edge of the sensor carrier (7). In a preferred embodiment, this corresponds in its plan view in shape and diameter of the mother to be controlled (1).
- the rotational movement of the nut (1) is transmitted to the sensor carrier (7).
- the spacer (11) on the one hand non-positively connected to the nut (1), on the other hand it detects the driver (10) non-positively.
- the driver (10) is interchangeable. He can thus assume different diameters and shapes, without the sensor carrier (7) must be replaced.
- the spacer (11) consists of a torsionally stiff variable-length molded part.
- a folded element (FIG. 7) is proposed, which can be stretched or compressed in the same way as a concertina.
- Fig. 6 and Fig. 6a are also mutually frictionally connectable spacers (Fig. 6 and Fig. 6a), which may vary in height and the inner diameter and for different nut (1) - bolt (2) connection can be put together.
- the transmission of the rotation angle change from the nut (1) to the sensor (8) can also be effected by means of so-called distance angle (FIG. 8).
- distance angle FOG. 8
- recesses are proposed in the driver through which the distance angles are guided and connectable to the sensor carrier.
- Fig. 11 In a simple embodiment and perforated metal strips are provided (Fig. 11), on the one hand with the mother and on the other hand connectable to the sensor carrier or driver. The invention will be explained in more detail in the following embodiments.
- Fig. 1 shows the basic principle.
- Fig. 2 shows the over the bolt (2) inverted hood (4).
- a hood (4) is slipped.
- This carries in its upper part a sensor (8).
- the power supply and a transmitting / receiving unit are housed here as further electronics (9).
- the hood (4) extends in the assembled state except for the nut (1) and enters with this a non-positive connection (Fig. 2).
- the sensor (8) thus detects the relative position to the magnet (3).
- the release of the nut (1) is accompanied by a relative change in position relative to the bolt (2). If the position of nut (1) to pin (2) changes, for example, as the nut (1) or pin (2) rotates, or both move in different ratio, the position change is registered by the sensor (8). In that regard, one speaks of a horizontal change in position. This refers to a rotation angle shift of magnet (3) to the position of the sensor (8).
- the sensor (8) also detects a horizontal change in position. This is understood to mean a reduction or increase in the distance from sensor (8) to magnet (3). This can be the result of a mother (1) who is loosening for various reasons. Due to the screw thread, the nut turns on the bolt and thus reduces the distance from nut (1) to magnet (3). Since the sensor (8) in the hood (4) has a connection to the nut (1), the ratio of sensor (8) to magnet (3) changes as it were. In the case of a loosening nut (1) this increases. The same effect occurs when the hood (4) unintentionally detached from the nut (1).
- the sensor (8) registered in a preferred embodiment, a relative horizontal and vertical position change.
- An absolute change of position is called when the entire device changes its position. This happens, for example, with a spinning wind turbine.
- the mounted around the axis of the wind turbine device moves with the rotor blade and thus makes an absolute change in position. In a preferred embodiment, this movement can also be registered by a sensor.
- a temperature sensor is provided for this purpose. By passing on the information, a change in position expected as a result of the temperature fluctuations can be calculated and predicted. By comparing the measured change in position and the calculated change in position, it is possible to conclude whether this is due to temperature or as a cause of a loosened nut (1) to bolt (2) connection.
- the data registered by the sensor (8) are processed by means of electronics (9) and then forwarded for use via a cable connection.
- This cable can be used to exchange data in both directions.
- the signal transmission is performed by a radio link, which is formed in a further preferred embodiment as a transmitting / receiving device.
- the sensor (8) is self-calibrating.
- Fig. 3 shows a preferred embodiment.
- the magnet (3) is mounted on a carrier unit (6) or embedded in this in whole or in part.
- the upper part of the one-piece carrier unit (6) is referred to as a magnetic carrier (17), the lower part as a cap (14).
- the carrier unit (6) can be connected to the upper end of the bolt (2).
- the cap (14) may be provided with an internal thread.
- the carrier unit (6) with the thread of the bolt (2) screw.
- Fig. 4 shows a further preferred embodiment. It indicates a multi-part carrier unit.
- This consists of a cap (14) and the magnetic carrier (17).
- the cap (14) in a preferred embodiment has a connecting element (18).
- the magnetic carrier (17) on the counterpart (19).
- By a coupling of magnetic carrier (17) and cap (14) so creates a multi-part carrier unit.
- About the cap (14) can be the multipart carrier unit with the bolt (2) connect.
- a screw is proposed.
- Fig. 5 shows a sensor carrier (7). This picks up the magnetically sensitive sensor (8).
- the sensor carrier (7) can be interchangeable equipped with a driver (10) and connected non-positively.
- Fig. 5a shows the driver (10) in plan view. He has a hexagonal shape. In a preferred embodiment, it has the shape and dimensions of the nut (1). If the dimensions of the nut (1) change depending on the intended use, the driver (10) can be replaced without replacing the sensor carrier (7).
- the sensor carrier (7) can be freely rotatably connected to the magnet carrier (17). In a preferred embodiment, the sensor carrier (7) engages with its detent (20) in a circumferential guide (21) of the magnetic carrier (17).
- the electronics (9), and / or the power supply and / or a transmitting / receiving device and / or additional sensors for temperature and movement is accommodated in the sensor carrier (7).
- Fig. 6 shows two nested spacers (11 / l la).
- Fig. 6a shows two spacers (11 / l la) in view.
- the lower of the two spacers (I Ia) is frictionally on the nut (1). At the same time it serves as a carrier of the second spacer (I Ia).
- several spacers (11) can be combined interlocking.
- At least the uppermost spacer (11) has a geometry which corresponds in shape and outer dimensions of the external size of the driver (10).
- the uppermost spacer (11) force fit over the driver (10) and connect with the nut (1) or an underlying spacer (I Ia) non-positively.
- Does the nut (1) in relation to the bolt (2) a rotational movement, this is transmitted via one or more spacers (11 / l la) on the driver (10). This leads to a relative change in the position of the sors (8) to the magnet (3).
- Fig. 7 discloses a folding Di punch piece (22) that can be pulled apart like a concertina. It is on the one hand frictionally on the mother (1), on the other hand it frictionally encloses the driver (10). A rotational movement is thus transmitted from the nut (1) on the driver (10) and registered by the sensor (8).
- Fig. 8 shows the non-positive transmission of the rotational movement of the nut (1) on the driver (10) via spacer angle (23).
- Fig. 8a shows the driver (10) in plan view.
- the distance angle (23) against the driver (10) with a screw (16) determine.
- Fig. 9 shows a detailed view of a spacer angle (23). In order to shorten this in length, he has predetermined breaking points (24).
- the spacer angle (23) encloses the nut (1) via a corner in the form of a closed angle piece (5).
- Hood (4), spacer (11/1 la), folding spacer (22) and spacer bracket (23) provide the adhesion of nut to sensor. They are also called connecting agents.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102015115508.7A DE102015115508A1 (en) | 2015-09-15 | 2015-09-15 | Device and method for monitoring detachable bolt-nut connections |
PCT/DE2016/100419 WO2017045666A1 (en) | 2015-09-15 | 2016-09-09 | Device and method for monitoring loosenable bolt-nut connections |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3350461A1 true EP3350461A1 (en) | 2018-07-25 |
Family
ID=57396234
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16801370.4A Withdrawn EP3350461A1 (en) | 2015-09-15 | 2016-09-09 | Device and method for monitoring loosenable bolt-nut connections |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3350461A1 (en) |
DE (2) | DE102015115508A1 (en) |
WO (1) | WO2017045666A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016215202A1 (en) * | 2016-08-16 | 2018-02-22 | Voith Patent Gmbh | Screw connection with a monitoring device |
CN108680191B (en) * | 2018-06-27 | 2023-10-03 | 南昌大学 | Device for monitoring loosening of bolt |
DE102019106580A1 (en) * | 2019-03-14 | 2020-09-17 | Wobben Properties Gmbh | Flange connection, wind turbine with the same, and method for monitoring the same |
CN110273909A (en) * | 2019-06-05 | 2019-09-24 | 上海应谱科技有限公司 | A kind of intelligent fastener and on-line monitoring system that can perceive fastener nut loosening |
CN110285955B (en) * | 2019-07-19 | 2024-02-20 | 贵州北盘江电力股份有限公司董箐分公司 | Device and method for detecting loosening of bolts and nuts of top cover of water turbine unit |
CN112082471A (en) * | 2020-09-16 | 2020-12-15 | 罗治军 | Formula wind generating set bolt on-line monitoring device is inhaled to magnetism |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3846795A (en) * | 1972-11-03 | 1974-11-05 | Transfer Systems | Early warning material failure indicator |
DE4002259A1 (en) | 1990-01-26 | 1991-08-08 | Dieter W Dr Ing Vetterkind | Threaded nut incorporating antenna for wireless security monitoring - has radio or ultrasonic alarm signal transmitter triggered by loss of contact on loosening of nut |
DE10138261A1 (en) | 2001-08-03 | 2003-02-27 | Siemens Ag | Sensor device monitoring coupling force between workpieces via sensor element acted on by coupling force provided by coupling device |
FI20035142A0 (en) | 2003-09-03 | 2003-09-03 | Ari Paeaekkoe | Loose nut / bolt indicator |
GB0704700D0 (en) * | 2007-03-12 | 2007-04-18 | Schofield Barry J | Container protection system |
US7994901B2 (en) * | 2008-02-18 | 2011-08-09 | Tag Blue L.L.C. | Lug stud and lug nut monitoring system, method, and components therefor |
US8004277B2 (en) * | 2008-12-30 | 2011-08-23 | Honeywell International Inc. | Rotary position sensing apparatus |
DE102009043267A1 (en) * | 2009-09-29 | 2011-04-21 | Neumayer Tekfor Holding Gmbh | Screwing unit for screwing wheel of vehicle i.e. lorry, has sensor component arranged relative to nut and arranged in front side of nut, where variable characteristics depends on pre-stress force that is produced by nut |
DE102011053150B9 (en) * | 2011-08-31 | 2014-03-27 | Björn Maile | System and method for the clamping force-generating screwing of components |
AU2011235942B2 (en) * | 2011-10-11 | 2015-01-22 | Nicholas Charles Dooner | Safetytrim nut locking device |
DE102013218845A1 (en) | 2013-09-19 | 2015-03-19 | Senvion Se | Apparatus, system and method for monitoring a flange connection of a wind turbine |
-
2015
- 2015-09-15 DE DE102015115508.7A patent/DE102015115508A1/en not_active Withdrawn
-
2016
- 2016-09-08 DE DE202016104954.7U patent/DE202016104954U1/en not_active Expired - Lifetime
- 2016-09-09 EP EP16801370.4A patent/EP3350461A1/en not_active Withdrawn
- 2016-09-09 WO PCT/DE2016/100419 patent/WO2017045666A1/en active Search and Examination
Also Published As
Publication number | Publication date |
---|---|
DE102015115508A1 (en) | 2017-03-16 |
WO2017045666A1 (en) | 2017-03-23 |
DE202016104954U1 (en) | 2017-01-02 |
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