CN114910195A - Monitoring device for monitoring whether bolt connecting device has tendency deviating from locking state - Google Patents
Monitoring device for monitoring whether bolt connecting device has tendency deviating from locking state Download PDFInfo
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- CN114910195A CN114910195A CN202110176721.8A CN202110176721A CN114910195A CN 114910195 A CN114910195 A CN 114910195A CN 202110176721 A CN202110176721 A CN 202110176721A CN 114910195 A CN114910195 A CN 114910195A
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- G01L1/00—Measuring force or stress, in general
- G01L1/04—Measuring force or stress, in general by measuring elastic deformation of gauges, e.g. of springs
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The present invention relates to a monitoring device for monitoring whether a bolted connection has a tendency to deviate from a locked state, one of the bolted connection and the monitoring device comprising a magnetoelastic member which is arranged at a certain stressed surface of the bolted connection, which in use is subjected to a pretensioning pressure by the stressed surface, which generates an internal stress corresponding to the pretensioning pressure, and which generates a magnetic field corresponding to the internal stress. The monitoring device comprises a sensing unit for sensing a real-time parameter value of a magnetic field parameter of the magnetic field and outputting a signal representing the real-time parameter value; and a control unit in communication with the sensing unit, the control unit configured to: receiving the signal from the sensing unit, determining whether a real-time parameter value exceeds a preset parameter threshold based on the signal, and determining that the bolt connection device has a tendency to deviate from a locked state when the real-time parameter value exceeds the parameter threshold. The present application also relates to a bolt connection device for use with the above monitoring device.
Description
Technical Field
The application relates to the field of crane connecting piece detection, in particular to a monitoring device for monitoring whether a bolt connecting device for connecting or fixing different structural components of a crane has a tendency of deviating from a locking state.
Background
Cranes or cranes are large machines commonly used in the construction field and are assembled from a large number of machine parts, and because of the frequent need for disassembly and reassembly, the connection or fixation of many structural parts is performed by means of detachable fasteners, such as bolts. Safety monitoring of these machines is important because of the enormous loads that are imposed on them and the corresponding inestimable loss of personnel and property due to accidents.
One important monitoring step is to monitor the locking state of the fastener. The fastener is normally held in a locked condition by means of a pretensioning pressure, and effective monitoring of the locked condition of the fastener is of concern for safety in use of the crane. Therefore, during the execution of a heavy construction project, the locking state of the bolt in the crane needs to be continuously monitored.
In most cases, the locking state of the bolt is monitored by means of manual detection. The manual detection has low accuracy and large limitation, can not be continuously carried out for a long time, so that a plurality of holes are formed, and no measurable parameter capable of indicating the current locking state of the bolt exists in the process.
There are also methods for monitoring the use or locking state of a bolt by detecting the axial or angular displacement of the bolt or nut. However, these methods cannot be used for prevention, because they cannot be detected after the bolt or nut has been axially or angularly displaced, or loosened or failed.
Disclosure of Invention
The object of the application is to detect in advance whether a bolt has a tendency to deviate from its locked state before the bolt deviates from its locked state, i.e. before physical loosening or failure occurs.
According to a first aspect of the present application, there is provided a monitoring device for monitoring whether there is a tendency of a bolt connecting device to deviate from a locked state, wherein the bolt connecting device is held in the locked state by a pretension pressure to connect or fix a target component, the bolt connecting device having at least one force receiving surface that receives the pretension pressure, the monitoring device comprising:
a magnetoelastic member provided at a certain force-receiving surface of the at least one force-receiving surface, being a component provided separately from the bolt connection device, and configured to receive, in use, the pre-tightening pressure received by the force-receiving surface, generate an internal stress corresponding to the received pre-tightening pressure, and generate a magnetic field corresponding to the internal stress;
a sensing unit for sensing a real-time parameter value of a magnetic field parameter of the magnetic field and outputting a signal representing the real-time parameter value; and
a control unit in communication with the sensing unit, the control unit configured to: receiving the signal from the sensing unit, determining whether the real-time parameter value exceeds a preset parameter threshold value based on the signal, and determining that the bolt connection device has a tendency to deviate from a locked state when the real-time parameter value exceeds the parameter threshold value.
According to a second aspect of the present application, there is provided a monitoring device for monitoring whether a bolt connection device has a tendency to deviate from a locked state, wherein the bolt connection device is held in the locked state by a pretension pressure to connect or fix a target component, the bolt connection device has at least one force-receiving surface that receives the pretension pressure, and includes a magnetoelastic member, wherein the magnetoelastic member is provided at a certain force-receiving surface of the at least one force-receiving surface, is integrally formed with a component that provides the certain force-receiving surface, and is configured to receive the pretension pressure received by the force-receiving surface in use, generate an internal stress corresponding to the received pretension pressure, and generate a magnetic field corresponding to the internal stress;
the monitoring device includes:
a sensing unit for sensing a real-time parameter value of a magnetic field parameter of the magnetic field and outputting a signal representing the real-time parameter value; and
a control unit in communication with the sensing unit, the control unit configured to: receiving the signal from the sensing unit, determining whether the real-time parameter value exceeds a preset parameter threshold based on the signal, and determining that the bolt connection device has a tendency to deviate from a locked state when the real-time parameter value exceeds the parameter threshold.
According to a third aspect of the present application there is provided a bolt comprising a shank defining a longitudinal axis and including an external thread over at least a portion of its length along the longitudinal axis, and a head integrally formed with the shank, the head (120) defining a stepped surface adjacent the shank, the head comprising an integrally formed magnetoelastic portion defining at least a portion of the stepped surface and configured to generate an internal stress in response to a force experienced by the at least a portion of the stepped surface and to generate a magnetic field corresponding to the internal stress.
According to a fourth aspect of the present application, there is provided a nut comprising a bore having an internal thread, and an end surface adapted to abut a target component when used with a threaded rod for connecting and securing the target component, the nut comprising an integrally formed magnetoelastic portion defining at least a portion of the end surface and configured to generate an internal stress and to generate a magnetic field corresponding to the internal stress in response to a force to which the at least a portion of the end surface is subjected.
According to a fifth aspect of the present application, there is provided a washer comprising an internal bore and opposing first and second washer surfaces, the washer comprising an integrally formed magnetoelastic portion defining at least a portion of at least one of the first and second washer surfaces and configured to generate an internal stress and generate a magnetic field corresponding to the internal stress in response to a force experienced by the at least a portion of at least one of the first and second washer surfaces.
According to a sixth aspect of the present application there is provided a cap comprising a cap-like housing and a sensor disposed on or in the cap-like housing, the sensor being configured to sense a magnetic field parameter of a magnetic field generated by the magnetoelastic portion during use of the cap with the bolt or nut or washer described above for connecting or fixing a target component.
According to the monitoring device, the magnetoelastic component is arranged in the bolt connecting device, particularly on the stressed surface of the bolt connecting device bearing the pre-tightening pressure, so that the magnetoelastic component bears the pre-tightening pressure same as that of the bolt connecting device, internal stress corresponding to the force borne by the magnetoelastic component is generated in the magnetoelastic component, and then the magnetic characteristic of a magnetic field corresponding to the internal stress generated by the magnetoelastic component is utilized to convert the potential pre-tightening pressure change of the bolt connecting device in the using process into a measurable magnetic field. According to the application, by providing a sensing unit comprising a sensor, a magnetic field parameter of the magnetic field generated by the magnetoelastic is measured and the measured real-time parameter value is converted into a signal, e.g. an electrical signal. The control unit of the monitoring device receives a signal from the sensing unit representing the value of the real-time parameter and compares the value of the real-time parameter with a preset parameter threshold. And if the real-time parameter value exceeds a preset parameter threshold value, judging that the bolt connecting device has a trend of deviating from the locking state.
By means of the monitoring device, when the pretightening pressure in the bolt connecting device changes, the loosening trend of the bolt connecting device can be monitored in time, but the loosening trend is detected when the bolt connecting device loosens in the axial displacement or angular displacement, so that a key prevention effect is achieved, operators of machinery can stop working, check and solve problems in time, and the safety of mechanical work is guaranteed to the maximum extent.
The present application also provides bolts, nuts and washers including a magnetoelastic part (also referred to herein as a "magnetoelastic part" when the "magnetoelastic member" is provided as an integral part of a component part of a bolt connection device, these two terms having the same meaning herein) and a cover including a sensor, which allow for uninterrupted monitoring of the locked state of the bolt connection device without adding parts during use for connecting and securing structural members, serving to prevent the bolt from deviating from the locked state.
Drawings
Fig. 1 shows a schematic structure according to a first embodiment of the present application;
fig. 2 shows a schematic structure according to a first modification of the first embodiment;
FIG. 3 shows a schematic structure according to another embodiment of the present application;
FIG. 4 shows a schematic structure according to yet another embodiment of the present application;
FIG. 5 is a schematic view of a bolt constructed in accordance with the principles of the present application.
Throughout the drawings, the same reference numbers indicate components that are structurally or functionally the same or similar.
Detailed Description
The present application aims to provide a monitoring device which is able to detect as early as possible a tendency of a bolted connection to deviate from its locked state before the bolted connection deviates from the locked state and thus before the bolted connection fails with serious adverse consequences.
The term "bolted connection" as used herein includes threaded fasteners or connections, including but not limited to bolts, screws, bolts, and the like, that connect or secure two or more structural components together with a pretensioning pressure. These fastening or connecting elements usually perform a connecting or fixing function by means of a pretensioning pressure and should always be kept at a predetermined pretensioning pressure, i.e. should always be in a locked state.
In the locked state of the screw connection, the screw connection comprises at least one force-bearing surface which is subjected to a pretensioning pressure. This force receiving surface may be a contact surface between the head of the bolt and the washer (if present) or between the washer and the structural component, may be a contact surface between the head of the bolt and the structural component (if a washer is not provided), or any other location. Here, "bolt connection means" also includes the washer.
The pretensioning pressure is first changed (e.g. reduced) before the bolt connection becomes loose, i.e. deviates from the locked state, and when the pretensioning pressure changes beyond a (minimum) pressure threshold that maintains the bolt connection in the locked state, the bolt connection will deviate from its locked state and become loose. According to the method and the device, whether the bolt connecting device is loosened or failed or not or whether the bolt connecting device has a trend of deviating from a locking state or not is judged by monitoring whether the pre-tightening pressure in the bolt connecting device is changed to exceed the pressure threshold value, so that the purpose of prevention is achieved. Reference herein to a "threshold" may include a pressure threshold for pretension stress of the bolt connection means, a stress threshold for internal stress of the magnetoelastic, a magnetic field parameter threshold for a magnetic field generated by the magnetoelastic, a signal threshold for a signal representing a real-time parameter value of a sensed magnetic field parameter, etc. It should be understood that the "threshold" of a parameter is a critical limit for the parameter at which physical loosening of the bolted joint (e.g., axial displacement, angular displacement, thread tooth breakage, etc.) will occur without the bolted joint deviating from the locked condition, and may be a predetermined parameter value or a predetermined parameter value range.
Therefore, the monitoring device for monitoring whether the bolt connecting device has the tendency of deviating from the locking state comprises the magnetic elastic piece, wherein the magnetic elastic piece is arranged at any stress surface of stress surfaces bearing pre-stress pressure in the bolt connecting device to bear the pre-stress pressure same as the stress surface, so that the stress change is synchronously sensed with the stress surface at the first time when the pre-stress pressure in the bolt connecting device changes, and the change of the internal stress of the magnetic elastic piece is further triggered. The magnetoelastic means are made of a permanently magnetized metallic material, for example a ferromagnetic material, alternatively it can also be made of a synthetic material that can fulfill the same function as described above.
The magnetoelastic element is subjected to the same force as the pretensioning pressure in the bolted connection, generates a corresponding internal stress and generates a magnetic field corresponding to its internal stress. When the pretightening pressure of the bolt connecting device changes, the internal stress generated by the magnetoelastic part also changes, and the generated magnetic field synchronously changes, which is embodied as the change of parameters such as the distribution of the magnetic field, the magnetic field intensity, the magnetic flux and the like.
The monitoring device of the application further comprises a sensing unit which comprises a sensor used for sensing the magnetic field parameters of the magnetic field generated by the magnetoelastic piece, wherein the sensor detects the magnetic field parameters representing the magnetic field generated by the magnetoelastic piece on one hand and converts the measured real-time parameter values into signals to be output on the other hand. The monitoring device further comprises a control unit, wherein the control unit receives a signal representing a real-time parameter value of the magnetic field parameter from the sensing unit, compares the real-time parameter value with a preset parameter threshold value, and obtains a conclusion whether the bolt connecting device has a trend deviating from a locking state according to a comparison result.
It will be appreciated by those skilled in the art that more than one magnetic field parameter characterizing the magnetic field generated by the magnetoelastic member may be, for example, magnetic flux, magnetic field strength, etc., and that the corresponding sensor may be any suitable sensor known in the art. Magnetic flux will be described herein as an example.
Specific embodiments of the present application are described below with reference to the accompanying drawings.
In the embodiment shown in fig. 1, the bolting arrangement comprises a bolt and washer 130 having a threaded shank 110 and a head 120 for connecting or securing the structural component 10 and the structural component 20 together. The threaded shank 110 of the bolt extends through the washer 130 into the structural members 10 and 20, and the head 120 is secured to the structural member 20 by the washer 130, the shank 110 defining a longitudinal axis. The monitoring device comprises a magnetoelastic member 210, a sensing unit 220 and a control unit 230 communicatively connected to the sensing unit.
In this embodiment, the magnetoelastic member 210 is made of a ferromagnetic material, is a separately provided component, and is disposed and, in use, compressed between the head 120 of the bolt and the washer 130. The pressure applied to the magnetoelastic member 210 is a pre-tightening pressure in the bolt coupling device, generates an internal stress corresponding to the pressure applied thereto, and generates a magnetic field corresponding to the internal stress thereof.
The sensing unit 220 may be a sensor itself for measuring a parameter of the magnetic field, e.g. a magnetic flux sensor in the present application. Optionally, for ease of operation, in the illustrated embodiment, the sensing unit 220 may include a housing 222, with the sensor 224 for measuring a parameter of the magnetic field being placed or attached or housed or attached on or in the housing 222, or supported by the housing 222, in any manner known in the art. For example, the housing 222 may be a cover-shaped housing, and when used, the housing 222 may be covered on the head 120, and the sensor 224 may be exposed to the magnetic field generated by the magnetoelastic member 210. It should be understood that the cap-like housing 222 is merely schematic and represents a support for supporting the sensor 224. One skilled in the art may envision any support to place and support the sensor 224 or may omit the support.
The communication between the control unit 230 and the sensing unit 220 may be achieved wirelessly, although a wired manner or any suitable communication manner known in the art may be used. The control unit 230 receives a signal from the sensing unit 220 indicative of a real-time parameter value of the measured magnetic field parameter, compares the real-time parameter value measured by the sensing unit 220 with a pre-stored parameter threshold value for the magnetic field parameter. When the real-time parameter value does not exceed the pre-stored parameter threshold value, the control unit 230 determines that the bolt connection device is in a normal locking state, and there is no loosening tendency. Otherwise, when the real-time parameter value exceeds the pre-stored parameter threshold value, the control unit 230 determines that the bolt coupling device has a tendency to deviate from the locked state. At this time, optionally, the control unit 230 may further include a warning unit or be in communication connection with other warning units already existing on the crane, so that the warning unit can be timely notified to provide a warning to the operator of the crane when the control unit 230 determines that the bolt connection device has a tendency to deviate from the locked state.
Further, optionally, the control unit 230 may further comprise a memory for storing all measured values of the magnetic field parameter sensed by the sensing unit 220, either in the form of the received signal or in the form of measured values of the magnetic field parameter. And storing numerical values of the pre-tightening pressure in the bolt connecting device changing along with the working time, the working load, the working environment and the like of the crane so that related personnel can analyze or research the change rule of the pre-tightening pressure in the bolt connecting device and provide support and basis for the subsequent optimization of the structural design of the crane.
In the embodiment of fig. 1, the magnetoelastic member 210 is disposed between the head 120 of the bolt coupling device and the washer 130 as a separately provided annular member. The magnetoelastic 210 may then be provided as an integral part of the monitoring device, as described above.
As a first variant of the embodiment of fig. 1, the magnetoelastic member 210 may be integrally formed with the head 120, providing at least a portion of the surface of the head 120 in contact with the washer 130, preferably providing a majority of this force-receiving surface of the head 120, more preferably providing the entire force-receiving surface.
As a second variant of the embodiment of fig. 1, the magnetoelastic member 210 may be integrally formed with the washer 130, providing at least part of the surface of the washer 130 in contact with the head 120 of the bolt. For example, as shown in fig. 2, the magnetoelastic member 210 is integrally embedded in the washer 130, providing a portion of the washer 130 that contacts the head 120 toward the first washer surface 132 of the head 120. Alternatively, the magnetoelastic member 210 may be integrally formed with the gasket 130 to provide the entire first gasket surface 132.
In the embodiment shown in fig. 1 and 2, the magnetoelastic member 210 is disposed at the force receiving surface between the head 120 of the bolt and the washer 130. According to the principles of the present application, the magnetoelastic member 210 may not be limited to this force-receiving surface, but any surface that receives a pretension pressure in a bolted connection may be used.
For example, in the embodiment of fig. 3, the magnetoelastic member 210 is disposed between the washer 130 and the structural member 20. The magnetoelastic member 210 may be provided as a separately provided component between the gasket 120 and the structural member 20. Alternatively, the magnetoelastic 210 may be formed as part of the washer 130 to provide at least a portion of the second washer surface of the washer 130 facing the structural component 20, preferably the entire second washer surface.
In the embodiment of fig. 1 to 3, the bolting means each comprise a bolt having a head 120 and a shank 110. It will be understood by those skilled in the art that the principles of the present application are not limited to the bolts shown in fig. 1-3, and that a combination of a stud and nut including only the threaded shank 110 may also be used. In embodiments of the bolted connection comprising a stud and nut combination, the head 120 in fig. 1 to 3 may be considered to be replaced by a nut. In this case, a separately formed magnetoelastic element may be arranged between the nut and the washer or between the washer and the structural component. Alternatively, the magnetoelastic member may be integrally formed with the nut so as to provide a surface of the nut that contacts the washer; the magnetoelastic member may be integrally formed with the washer so as to provide at least one of a first washer surface of the washer in contact with the nut and a second washer surface of the washer in contact with the structural component.
In the embodiment of the present application described with reference to fig. 1 to 3, when the magnetoelastic member 210 is provided as a separate component, it may be a constituent component of the monitoring device, and in this case, the monitoring device may include the magnetoelastic member 210, the sensing unit 220 and the control unit 230. When the magnetoelastic member 210 is provided as an integral part of a component part (a head of a bolt, a nut, or a washer) of the bolt coupling apparatus (which may also be referred to as a "magnetoelastic portion" at this time), the monitoring apparatus may include only the sensing unit 220 and the control unit 230.
Fig. 4 shows an embodiment in which a magnetoelastic member 210 is disposed between the head 120 and the structural member 20 instead of the washer 130. It can also be said that the magnetoelastic element 210 now provides the two washer surfaces of the washer 130 of the previous embodiment which are in contact with the nut and the structural part.
The application adopts the magnetoelasticity technology to carry out non-contact sensing, overcomes the limitation of manual detection, and can generate measurable parameters for indicating the locking state of the bolt connecting device. Under the condition that the magnetic elastic piece and the bolt or the gasket are integrally formed, the bolt is not influenced in use, continuous and uninterrupted monitoring is realized, and accidents caused by bolt loosening are reduced to the maximum extent.
Whether bolt connection device has the trend of deviating from the locking state is judged through the change of the pretension pressure in the monitoring bolt connection device to this application, detects before bolt connection device takes place that physics is not hard up, rather than just detect after bolt connection device takes place that physics is not hard up the displacement, has played the effect of effective prevention. Of course, according to the principle of the application, not only can the tendency of deviation from the locking state of the bolt connecting device be judged, but also any other failure modes which can be reflected through the pre-tightening pressure can be effectively prevented, and only the pre-tightening pressure threshold, the internal stress threshold of the magnetoelastic part corresponding to the pre-tightening pressure threshold and the threshold of the magnetic field parameter corresponding to the internal stress threshold are reasonably preset. This greatly reduces the engineering accidents caused by the failure of the bolt and avoids the loss of personnel and property caused thereby.
In connection with the above-mentioned monitoring device, the present application also relates to a bolt connection device as described above, such as a bolt or a nut or a washer comprising a magnetoelastic portion.
As shown in fig. 5, the bolt of the present application, which is a component of the bolting apparatus of the present application, includes a shank 110 and a head 120 integrally formed with the shank 110, the shank 110 defining a longitudinal axis and including an external thread over at least a portion of a length along the longitudinal axis, the head 120 defining a stepped surface 125 adjacent to the shank 110, the head 120 including an integrally formed magnetoelastic portion 150, the magnetoelastic portion 150 defining at least a portion of the stepped surface 125, preferably the entire stepped surface 125, and being configured to generate an internal stress in response to a force to which the stepped surface is subjected and to generate a magnetic field corresponding to the internal stress. As shown in fig. 5, the magnetoelastic portion 130 may be integrally embedded in the head portion 120.
A nut according to the present application includes an internal bore having internal threads and an end surface (similar to surface 125 of fig. 5) adapted to abut a target component (e.g., structural component 20 of fig. 1) when used with a threaded rod (e.g., bolt shank 110 of fig. 1) for connecting and securing the target component. The nut includes an integrally formed magnetoelastic portion defining at least a portion of the end surface and configured to generate an internal stress in response to a force experienced by the end surface and to generate a magnetic field corresponding to the internal stress.
The gasket of the present application may be the gasket 130 of the embodiment shown in fig. 1 to 4, the gasket 130 comprising an integrally formed magnetoelastic portion defining at least a portion of at least one of the first and second opposing gasket surfaces and being configured to generate an internal stress in response to a force experienced by the end surface and to generate a magnetic field corresponding to the internal stress.
The present application also provides a cover comprising a sensor 224 and a cover-like housing 222, as shown in fig. 1 to 4. The cover can monitor the locking state of the bolted connection when used with the bolt, nut and washer of the present application, playing a preventive role.
The bolt state monitoring device can be not only used for cranes, but also applied to any other machines which comprise bolt connection modes and need to monitor the bolt locking state, such as engineering machinery, such as excavators and road rollers; agricultural machines such as seeders, harvesters, and the like; such as trucks, cars, and the like.
While the invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. On the contrary, various modifications and equivalent arrangements may be devised by those skilled in the art without departing from the principles of the present application. The scope of protection of this application is limited only by the claims.
Claims (12)
1. A monitoring device for monitoring whether a bolted connection has a tendency to deviate from a locked state, wherein the bolted connection is held in the locked state by a pretensioning pressure to connect or fix a target component (10, 20), the bolted connection having at least one force-receiving surface subjected to the pretensioning pressure, the monitoring device comprising:
a magnetoelastic member (210) provided at a certain force-receiving surface of the at least one force-receiving surface, being a component provided separately from the bolt connection device, and configured to receive, in use, the pre-tightening pressure received by the force-receiving surface, generate an internal stress corresponding to the received pre-tightening pressure, and generate a magnetic field corresponding to the internal stress;
a sensing unit (220) for sensing a real-time parameter value of a magnetic field parameter of the magnetic field and outputting a signal representing the real-time parameter value; and
a control unit (230) in communication with the sensing unit (220), the control unit (230) configured for: receiving the signal from the sensing unit (220), determining whether the real-time parameter value exceeds a preset parameter threshold based on the signal, and determining that the bolt connection has a tendency to deviate from a locked state when the real-time parameter value exceeds the parameter threshold.
2. A monitoring device according to claim 1, wherein the bolt connection means comprises a bolt having a shank (110) and a head (120) integrally connected to the shank (110), or the bolt connection means comprises a shank and a nut threadedly connected to the shank,
the bolt connecting device further includes: a washer (130) disposed between the head (120) or the nut and the target component in a longitudinal direction along a longitudinal axis defined by the stem (110),
wherein the magnetoelastic (210) is arranged between the head (120) or the nut and the washer (130); or between the washer (130) and the target component; or the magnetoelastic member (210) serves as the gasket (130).
3. A monitoring device for monitoring whether a bolted connection has a tendency to deviate from a locked state, wherein the bolted connection is held in the locked state by a pretensioning pressure to connect or fix a target component (10, 20), the bolted connection having at least one force-receiving surface subjected to the pretensioning pressure, and comprising a magnetoelastic member (210), wherein the magnetoelastic member is provided at a force-receiving surface of the at least one force-receiving surface, is integrally formed with a component providing the force-receiving surface, and is configured to receive the pretensioning pressure to which the force-receiving surface is subjected in use, generate an internal stress corresponding to the received pretensioning pressure, and generate a magnetic field corresponding to the internal stress;
the monitoring device includes:
a sensing unit (220) for sensing a real-time parameter value of a magnetic field parameter of the magnetic field and outputting a signal representing the real-time parameter value; and
a control unit (230) in communication with the sensing unit (220), the control unit (230) configured for: receiving the signal from the sensing unit (220), determining whether the real-time parameter value exceeds a preset parameter threshold based on the signal, and determining that the bolt connection has a tendency to deviate from a locked state when the real-time parameter value exceeds the parameter threshold.
4. A monitoring device according to claim 3, wherein the bolt connection means comprises a bolt having a shank (110) and a head (120) integrally connected to the shank (110), or the bolt connection means comprises a shank and a nut threadedly connected to the shank,
wherein the head or the nut provides the certain stressed surface, the magnetoelastic (210) being integrally formed with the head or the nut and providing the certain stressed surface to withstand the pre-tensioning stress.
5. A monitoring device according to claim 4, characterised in that a washer (130) is arranged between the head (120) or the nut and the target part in the longitudinal direction of the longitudinal axis defined by the shank (110), the washer (130) providing the certain force-receiving surface, the magnetoelastic (210) being formed integrally with the washer (130) and providing the certain force-receiving surface to receive the pretensioning stress.
6. A monitoring device according to any one of claims 1-5, in which the magnetoelastic (210) is made of a magnetoelastic material, such as a ferromagnetic material.
7. A monitoring device according to any one of claims 1-6, wherein the sensing unit (220) comprises a sensor (224) for measuring a parameter of a magnetic field, preferably the sensing unit (220) comprises a cap-like housing (222) adapted to be placed or attached or mounted onto a head (120) or a nut of the bolt connection device, the sensor (224) being provided on or in the cap-like housing (222).
8. The monitoring device according to claims 1-7, wherein the control unit (230) comprises a memory for storing the signal representing the real-time parameter value received from the sensing unit (220) for subsequent analysis purposes, preferably wherein the control unit (230) communicates with the sensing unit (220) via a wireless or wired connection.
9. A bolt comprising a shank (110) and a head (120) formed integrally with the shank (110), the shank (110) defining a longitudinal axis and including an external thread over at least a portion of its length along the longitudinal axis, the head (120) defining a stepped surface (125) adjacent the shank (110), the head (120) including an integrally formed magnetoelastic portion (150), the magnetoelastic portion (150) defining at least a portion of the stepped surface (125) and being configured to generate an internal stress in response to a force to which the at least a portion of the stepped surface is subjected and to generate a magnetic field corresponding to the internal stress.
10. A nut comprising an internal bore with an internal thread, and an end surface adapted to abut a target component when used with a threaded rod for connecting and fixing the target component, characterized in that the nut comprises an integrally formed magnetoelastic portion defining at least a portion of the end surface and configured to generate internal stresses and to generate a magnetic field corresponding to the internal stresses in response to forces to which the at least a portion of the end surface is subjected.
11. A washer comprising an internal bore and opposing first and second washer surfaces, the washer comprising an integrally formed magnetoelastic portion defining at least a portion of at least one of the first and second washer surfaces and configured to generate an internal stress and generate a magnetic field corresponding to the internal stress in response to a force experienced by the at least a portion of at least one of the first and second washer surfaces.
12. A cover comprising a cover-like housing (222) and a sensor (224) disposed on or in the cover-like housing (222), the sensor (224) being configured for sensing a magnetic field parameter of a magnetic field generated by the magnetoelastic portion during use of the cover with a bolt according to claim 9 or a nut according to claim 10 or a washer according to claim 11 for connecting or fixing a target component (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110176721.8A CN114910195A (en) | 2021-02-07 | 2021-02-07 | Monitoring device for monitoring whether bolt connecting device has tendency deviating from locking state |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110176721.8A CN114910195A (en) | 2021-02-07 | 2021-02-07 | Monitoring device for monitoring whether bolt connecting device has tendency deviating from locking state |
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| Publication Number | Publication Date |
|---|---|
| CN114910195A true CN114910195A (en) | 2022-08-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110176721.8A Pending CN114910195A (en) | 2021-02-07 | 2021-02-07 | Monitoring device for monitoring whether bolt connecting device has tendency deviating from locking state |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116292132A (en) * | 2022-12-27 | 2023-06-23 | 国核信息科技有限公司 | Device and method for monitoring bolt looseness of wind generating set |
-
2021
- 2021-02-07 CN CN202110176721.8A patent/CN114910195A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116292132A (en) * | 2022-12-27 | 2023-06-23 | 国核信息科技有限公司 | Device and method for monitoring bolt looseness of wind generating set |
| CN116292132B (en) * | 2022-12-27 | 2024-04-05 | 国核信息科技有限公司 | Device and method for monitoring bolt looseness of wind generating set |
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