CN116838693B

CN116838693B - Early warning device for preventing fastener from loosening and power system

Info

Publication number: CN116838693B
Application number: CN202311119090.1A
Authority: CN
Inventors: 丁晨星; 张滔; 叶健辉; 郭兴军; 潘巧; 叶翔; 魏向东
Original assignee: Guangzhou Power Supply Bureau of Guangdong Power Grid Co Ltd
Current assignee: Guangzhou Power Supply Bureau of Guangdong Power Grid Co Ltd
Priority date: 2023-09-01
Filing date: 2023-09-01
Publication date: 2023-11-21
Anticipated expiration: 2043-09-01
Also published as: CN116838693A

Abstract

The application relates to an early warning device and a power system for preventing fastener loosening, wherein the early warning device for preventing fastener loosening comprises: the device comprises a shell, an early warning piece and an elastic piece; the shell comprises a first shell part and a second shell part connected with the first shell part; the early warning part comprises an early warning part and a covering part, the early warning part is connected with the second shell part, the covering part is arranged at intervals with the early warning part, and the covering part can rotate from a first position to a second position relative to the early warning part; the elastic piece is arranged between the first shell part and the second shell part and is configured to enable the covering part to rotate from the second position to the first position. In the early warning device, workers can acquire early warning information through photographing at the initial stage of bolt loosening without waiting until the bolts are completely loosened, and the positions of the bolts are overhauled, so that the stable operation of a power grid line is ensured.

Description

Early warning device for preventing fastener from loosening and power system

Technical Field

The application relates to the technical field of power systems, in particular to an early warning device for preventing fasteners from loosening and a power system.

Background

The bolt is used as an important part in mechanical equipment and is widely applied to the fields of electric power, building engineering tower cranes, construction elevators, communication towers and the like. For example, in a power transmission line, a connecting fitting such as a wire, a strain clamp, a suspension clamp and the like is fixed by adopting bolts, and the bolts at the connecting positions of the components are easy to loosen under the condition of long-term dynamic wind load or large temperature difference due to the fact that the power transmission line is complex in stress and sensitive to wind. If the bolt is loosened, the resistance of the contact surface of the connecting fitting is increased, so that the wire clamp is heated, the line loss is increased, and the safety accident of the power grid is easily caused.

In the related art, bolts at all connection parts of a line are photographed in an unmanned aerial vehicle inspection mode, and whether the bolts are loosened is known through image recognition after photographing.

However, according to the unmanned aerial vehicle inspection mode, workers can know the situation of the bolt after the bolt is completely loosened through the image, but cannot know the situation of the bolt at the initial stage of loosening through the image, and the occurrence of a power grid safety accident is easy to occur after the bolt is loosened, so that if the situation that a small amount of loosening occurs to the bolt before the bolt is completely loosened, early warning can be carried out, and the unmanned aerial vehicle inspection mode has important significance for safe and stable operation of a power grid line.

Disclosure of Invention

Accordingly, it is necessary to provide an early warning device and a power system for preventing loosening of fasteners, which are directed to the problem that a worker can learn from an image that a bolt is completely loosened, but cannot learn from an image that the bolt is in an initial stage of loosening.

A first aspect of the present application provides a bolt loosening warning device, comprising: the device comprises a shell, an early warning piece and an elastic piece; the shell comprises a first shell part and a second shell part connected with the first shell part; the early warning part comprises an early warning part and a covering part, the early warning part is connected with the second shell part, the covering part is arranged at intervals with the early warning part, and the covering part can rotate from a first position to a second position relative to the early warning part; when the cover part is at the first position, the orthographic projection of the cover part and the early warning part along the first direction is at least partially misaligned, so that the early warning part can prompt early warning information to the outside; when the shielding part is at the second position, the front projection of the shielding part and the early warning part along the first direction are overlapped, so that the shielding part can cover the early warning part, and the first direction is perpendicular to the plane where the early warning part is positioned; the elastic piece is arranged between the first shell part and the second shell part and is configured to enable the covering part to rotate from the second position to the first position.

In one embodiment, the early warning device further comprises a mounting piece and a driving piece, the mounting piece is arranged between the first shell part and the second shell part, the driving piece is arranged on the mounting piece, one end of the elastic piece is connected with the driving piece, the other end of the elastic piece is abutted with the second shell part, and the driving piece can squeeze the elastic piece when the covering part rotates.

In one embodiment, the cover portion is coupled to the first housing portion, the first housing portion is rotatably coupled to the second housing portion, and the mounting member is coupled to the first housing portion.

In one embodiment, the early warning device further comprises a first fixing member, the first fixing member comprises a main body portion and a fixing portion connected with the main body portion, the main body portion is arranged between the second shell portion and the mounting member, the mounting member is provided with a containing groove, the fixing portion extends to the outside of the mounting member through the containing groove, and the elastic member is connected between the driving member and the fixing portion.

In one embodiment, the accommodating groove includes a first side wall and a second side wall which are oppositely arranged, the first side wall abuts against the fixing portion when the covering portion is in the first position, and the second side wall abuts against the fixing portion when the covering portion is in the second position.

In one embodiment, the early warning device further comprises a limiting piece and a clamping piece, wherein the limiting piece is arranged in the mounting piece, teeth are arranged on the outer peripheral surface of the limiting piece, and the clamping piece is arranged on the mounting piece and can abut against the teeth; when the cover part is at the second position, the limiting part is subjected to external pressure, and the teeth are used for preventing the clamping part from moving so as to keep the elastic part in a pressed state; when the external pressure is reduced to a preset pressure value, the limiting piece can promote the elastic piece to release the elastic force so as to rotate the covering part from the second position to the first position.

In one embodiment, the early warning device further comprises a first fixing piece, a limiting piece and a second fixing piece, wherein the first fixing piece is connected with the second shell part by means of the second fixing piece, the limiting piece is arranged between the first fixing piece and the second fixing piece, and through holes are formed in the first fixing piece, the limiting piece and the second fixing piece and used for allowing the fastening piece to pass through.

In one embodiment, the cover portion is coupled to the mounting member, the first housing portion is fixedly coupled to the second housing portion, and the mounting member is rotatable relative to the second housing portion.

In one embodiment, the second shell portion is provided with a slot for accommodating the cover portion, the slot comprising a third side wall and a fourth side wall arranged opposite to each other, the cover portion being rotatable in the slot relative to the second shell portion, the cover portion being in a first position, the third side wall being in abutment with the cover portion, the cover portion being in abutment with the fourth side wall in a second position.

A second aspect of the present application provides an electrical power system comprising a fastener, an electrical power device, and an early warning device for preventing loosening of the fastener as in any of the embodiments described above, wherein the early warning device is disposed between the fastener and the electrical power device.

In the early warning device for preventing the fastener from loosening, the covering part is rotated from the first position to the second position, the covering part moves to the upper side of the early warning part to cover the early warning part, the early warning part can not prompt early warning information to the outside, and the early warning part indicates that the fastener does not loosen at the moment; when the fastener is loosened, the covering part rotates from the second position to the first position through the elasticity released by the elastic piece, the covering part is far away from the position where the early warning part is located in the process, at the moment, the covering part can not cover the early warning part, and the early warning part can prompt early warning information to the outside. After the bolts are completely loosened, workers can acquire early warning information through photographing at the initial stage of loosening the bolts, and overhaul is carried out on the positions of the bolts, so that stable operation of a power grid line is ensured.

Drawings

Fig. 1 is a schematic diagram illustrating an installation of a power system according to an embodiment of the application.

FIG. 2 is a state diagram of the first shell portion in a first position according to an embodiment of the present application.

FIG. 3 is a state diagram of the first shell portion in the second position according to an embodiment of the present application.

FIG. 4 is an exploded view of an early warning device according to an embodiment of the present application.

FIG. 5 is a schematic view of the elastic member positioned between the first shell portion and the ring member according to an embodiment of the present application.

FIG. 6 is a block diagram of the ring, the driving member, and the detent member according to an embodiment of the present application.

Fig. 7 is a schematic view of the first sidewall abutting against the fixing portion in an embodiment of the application.

Fig. 8 is a schematic view of the second sidewall abutting against the fixing portion in an embodiment of the application.

Fig. 9 is a structural view of a second fixing member according to an embodiment of the present application.

Fig. 10 is a cross-sectional view of a first fixing member, a limiting member, and a second fixing member according to an embodiment of the present application.

FIG. 11 is an exploded view of an early warning device according to another embodiment of the present application.

Wherein, the reference numerals are as follows: the fastener 1, the power device 2, the warning device 3, the housing 10, the first housing portion 11, the second housing portion 12, the stopper 121, the warning member 20, the cover portion 21, the warning portion 22, the elastic member 30, the mount 40, the accommodation groove 41, the first side wall 411, the second side wall 412, the driving member 50, the first fixing member 60, the main body portion 61, the fixing portion 62, the stopper 70, the stopper 80, and the second fixing member 90.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that, if any, these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are used herein with respect to the orientation or positional relationship shown in the drawings, these terms refer to the orientation or positional relationship for convenience of description and simplicity of description only, and do not indicate or imply that the apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.

Referring to fig. 1, an embodiment of the present application provides an electric power system, which includes a fastener 1, an electric power device 2, and an early warning device 3 for preventing the fastener from loosening, wherein the early warning device 3 is disposed between the fastener 1 and the electric power device 2, the fastener 1 is used for fastening the electric power device 2, and the early warning device 3 is used for sending early warning information to a worker when the fastener 1 is loosened.

The fastener 1 may be a threaded member such as a bolt, a screw, a stud, etc., and in the embodiment of the present disclosure, the fastener 1 is a bolt. Correspondingly, the power device 2 is provided with screw holes, the fastening piece 1 fastens the power device 2 through the screw holes, and the early warning device 3 is tightly pressed between the fastening piece 1 and the power device 2.

The power device 2 includes, but is not limited to, devices located upstream, downstream of a power transmission substation, such as generators, motors, transformers, transmission lines, power cables, and the like. In some embodiments, the early warning device 3 of the present application is particularly suitable for use in a power transmission line.

In other embodiments, the warning device 3 may also be applied to various devices that use the fastener 1, such as a case, a mounting device, a fastening device, etc.

As shown in connection with fig. 2-4, in some embodiments, the pre-warning device 3 includes a housing 10, a pre-warning member 20, and a resilient member 30. The housing 10 includes a first housing portion 11 and a second housing portion 12, the first housing portion 11 and the second housing portion 12 for supporting and mounting components therein. The early warning member 20 includes a cover portion 21 and an early warning portion 22, the cover portion 21 is connected with the outside of the first shell portion 11, the early warning portion 22 is connected with the outside of the second shell portion 12, the first shell portion 11 can rotate relative to the second shell portion 12, and the cover portion 21 can follow the first shell portion 11 to move away from or close to the early warning portion 22. Specifically, when the first shell portion 11 rotates from the first position to the second position, the covering portion 21 moves to above the early warning portion 22 (as shown in fig. 3) along with the first shell portion 11, so as to cover the early warning portion 22, so that the early warning portion 22 cannot prompt the early warning information to the outside, and at this time, the bolt is indicated to be not loosened. The elastic member 30 is disposed between the first shell portion 11 and the second shell portion 12, and the elastic member 30 is configured to enable the first shell portion 11 to rotate from the second position to the first position, and when in the first position, the cover portion 21 follows the first shell portion 11 to move to be staggered with the early warning portion 22 (as shown in fig. 2), and the early warning portion 22 can prompt early warning information to the outside, and at the moment, the bolt is indicated to be loosened.

The first shell portion 11 is connected to the cover portion 21, and it is understood that when the first shell portion 11 rotates between a first position and a second position, the cover portion 21 can rotate along with the first shell portion (around a central axis of the first shell portion), that is, the first position where the first shell portion 11 is located corresponds to the first position where the cover portion 21 is located, and the second position where the first shell portion 11 is located corresponds to the second position where the cover portion 21 is located.

The rotary gap between the first shell part 11 and the second shell part 12 is sealed by a sealing ring, so that the dustproof and waterproof effects are achieved.

The initial state of the early warning device 3 corresponds to the state when the first shell portion 11 is in the first position, the operating state of the early warning device 3 corresponds to the state when the first shell portion 11 is in the second position, and it is understood that the early warning state (when the device is in use) and the initial state (when the device is not in use) of the early warning device 3 both correspond to the state when the first shell portion 11 is in the first position.

In practical application, the early warning device 3 passes through the rod part of the bolt, the bolt is screwed into the screw hole, the early warning device 3 is pressed between the bolt and the screw hole, and the worker rotates the first shell 11 from the first position to the second position, namely, the device enters into a working state. When the bolt does not loosen, the early warning device 3 is used as a gasket, the gasket has pretension, and after the bolt compresses the gasket, the bolt can be preliminarily prevented from loosening under the action of pretension and friction force. In the working state, the first shell 11 is always at the second position, and the cover 21 is located above the early warning portion 22 (as shown in fig. 3), so that the early warning portion 22 covers the portion 21, and the early warning portion 22 cannot prompt the early warning information to the outside. When the bolt loosens, the elastic piece 30 releases the elastic force to enable the first shell part 11 to rotate from the second position to the first position, the cover part 21 moves along with the first shell part 11, the early warning device 3 enters an early warning state, at the moment, the cover part 21 and the early warning part 22 are staggered (as shown in fig. 2), the early warning part 22 is exposed to the outside, and early warning information of the early warning part 22 can be timely obtained by staff.

When the bolt is loosened, the elastic piece 30 can actively react to make the covering part 21 far away from the position where the early warning part 22 is located, and a worker can timely acquire early warning information of the initial stage of bolt loosening from the early warning part 22, and can not discover the bolt after the bolt is completely loosened. Through obtaining early warning information, the staff can in time overhaul the position that the bolt is located, need not wait for the bolt to become flexible after completely can be found.

The cover portion 21 and the warning portion 22 are each provided in a plate/block shape. In the embodiment disclosed by the application, when the first shell 11 is at the first position, the front projection of the cover portion 21 and the early warning portion 22 along the first direction is at least partially misaligned, so that the early warning portion 22 can prompt the early warning information to the outside, and preferably, the cover portion 21 and the early warning portion 22 are completely staggered; when the first shell portion 11 is in the second position, the front projections of the covering portion 21 and the early warning portion 22 along the first direction coincide, so that the covering portion 21 can cover the early warning portion 22, and the first direction is perpendicular to the plane where the covering portion 21/the early warning portion 22 is located.

Specifically, the front projection of the cover portion 21 and the warning portion 22 in the first direction is at least partially misaligned, which means that at least a portion of one of the cover portion 21 and the warning portion 22 does not overlap with the projection of the other.

Preferably, the areas of orthographic projections of the cover portion 21 and the warning portion 22 in the first direction are the same in size, i.e., the shapes of the cover portion 21 and the warning portion 22 are the same.

The upper surface of the warning part 22 is provided with a light reflecting layer for reflecting external light. The light irradiates on the reflective film, and the reflected light information of the early warning part 22 can be obtained by flash shooting within a certain distance, and the reflected light information can be obtained both in the daytime and at night. The reflective layer can be used in places with darker light such as tunnels, subways and the like.

In other embodiments, the upper surface of the warning portion 22 may be provided with a reflective film, a reflective plate, and the like, which have the same function as the reflective layer.

As shown in connection with fig. 4-6, the pre-warning device 3 further comprises a mounting member 40. The mounting member 40 has a circular ring shape with its central axis coincident with the central axis of the first shell portion 11. The mounting member 40 is disposed inside the first shell portion 11 and is welded to the first shell portion 11, and the mounting member 40 is capable of following the movement of the first shell portion 11. The elastic member 30 is disposed between the mounting member 40 and the first housing portion 11, the elastic member 30 surrounds the outside of the mounting member 40, and the mounting member 40 is used for maintaining the elastic member 30 in a surrounding state.

The warning device 3 further comprises a driving member 50. The driving member 50 is disposed at an outer side of the mounting member 40, and the driving member 50 is capable of following the movement of the first housing portion 11. One side of the driving member 50 is connected to one end of the elastic member 30, the other end of the elastic member 30 abuts against the second shell portion 12, and when the first shell portion 11 rotates from the first position to the second position, the driving member 50 also follows the first shell portion 11 to rotate, and at this time, the driving member 50 presses the elastic member 30.

Further, due to the arrangement of the mounting member 40, the elastic member 30 is pushed or released to return, and the elastic member is wound around the outer side of the mounting member 40, i.e., the deformation and recovery path of the elastic member 30 is an arc.

The warning device 3 further comprises a first fixing element 60. The first fixing member 60 is located between the first and second shell portions 11 and 12, and the first fixing member 60 includes a main body portion 61 and a fixing portion 62. The main body portion 61 is provided inside the mount 40, the main body portion 61 is connected to the fixing portion 62, the main body portion 61 is bonded to the inside of the first housing 11, the main body portion 61 is connected to the second housing portion 12, and the second housing portion 12 is always stationary with respect to the first housing portion 11, that is, the main body portion 61 and the fixing portion 62 are also always stationary. The mounting member 40 is provided with a receiving groove 41, and the fixing portion 62 extends to the outside of the mounting member 40 through the receiving groove 41, i.e., the fixing portion 62 is located between the outside of the mounting member 40 and the inner wall of the first housing portion 11, the fixing portion 62 being for fixing the elastic member 30.

Referring to fig. 7-8, in a specific embodiment, between the first end of the elastic member 30 and one side of the fixing portion 62, the second end of the elastic member 30 is connected to the driving member 50 after surrounding the outer side of the mounting member 40, and when the driving member 50 moves, the first end of the elastic member 30 can be pressed toward the second end of the elastic member 30.

Further, the receiving groove 41 is provided at a side of the mounting member 40 fixed to the inner wall of the first housing portion 11. The size of the receiving groove 41 is larger than that of the fixing portion 62, wherein the size of the receiving groove 41 is the length of an arc formed by the receiving groove, the fixing portion 62 is in a fan shape, and the length of the fixing portion 62 is the length of an arc of an edge of the fixing portion, whereby the fixing portion 62 is stationary, and the receiving groove 41 on the mounting member 40 can move relative to the fixing portion 62.

The accommodating groove 41 includes a first side wall 411 and a second side wall 412 disposed opposite to each other, and in the first position, the first side wall 411 of the accommodating groove 41 abuts against one side of the fixing portion 62 (as shown in fig. 7); during the clockwise rotation of the first housing portion 11 from the first position to the second position, the driving member 50 presses the elastic member until the second sidewall 412 of the receiving groove 41 abuts against the other side of the fixing portion 62 (as shown in fig. 8). The first side wall 411 and the second side wall 412 of the accommodating groove 41 abut against the fixing portion 62 to limit the rotation position of the first shell portion 11, and when the first side wall 411 or the second side wall 412 hits against the fixing portion 62, the rotation of the first shell portion 11 is stopped and cannot be continued.

In practical use, the angle corresponding to the fan-shaped fixing portion 62 may be set to 45 degrees, so that the elastic member 30 generates an initial pressure, the elastic member 30 is always pressed to store energy initially even if the driving member 50 does not start to press the elastic member 30, after the driving member 50 presses the elastic member 30, the elastic member 30 further stores energy, and when the elastic member 30 releases energy, the driving member 50 can be pushed better, so that the first shell 11 can be rotated from the second position to the first position stably.

Preferably, the driving member 50 is disposed at a position of the mounting member 40 near the first side wall 411 of the receiving groove 41.

In other embodiments, the securing portion 62 may be other shapes, such as rectangular, etc.

Referring again to fig. 4 to 6, the warning device 3 further includes a stopper 70 and a stopper 80. The limiting member 70 is located below the first fixing member 60 and disposed inside the mounting member 40, the outer circumferential surface of the limiting member 70 is provided with teeth, and the positioning member 80 is disposed inside the mounting member 40 and can abut against the teeth. When the stopper 70 is subjected to external environmental pressure, i.e., the bolt presses the device, the stopper 70 is pressed by the bolt to be stationary. In the process of rotating the first shell 11 from the first position to the second position, the mounting member 40 and the driving member 50 move along with the first shell 11, the driving member 50 compresses the elastic member 30, and the clamping member 80 slides along the outer side surface of the tooth and can abut against the tooth. The limiting member 70 is stationary, and the tooth of the limiting member 70 is combined with the retaining member 80 to limit the rotation direction of the first shell portion 11, so that the first shell portion 11 can only rotate from the first position to the second position, and the first shell portion 11 cannot return to the first position during the process, and at this time, the elastic member 30 is always kept in the pressed state. When the environmental pressure value received by the limiting member 70 is reduced to a preset pressure value, that is, when the bolt is loosened, the limiting member 70 is not completely compressed by the bolt, at this time, the limiting member 70 can freely move, and the elastic member 30 can release the extruded elastic force, and the elastic force acts on the driving member 50 to push the driving member 50 to move. Further, in the process of moving the driving member 50 by the elastic force released by the elastic member 30, the mounting member 40 rotates around the central axis thereof, the blocking member 80 moves along with the mounting member 40, and since the limiting member 70 is not completely compressed by the bolt, the elastic force released by the elastic member 30 can cause the blocking member 80 to push the teeth reversely, so that the limiting member 70 rotates, that is, the limiting member 70 loses the limiting effect at this time, and finally, the first shell 11 rotates from the second position to the first position under the action of the elastic force of the elastic member 30.

In practical application, the bolt compresses the early warning device 3 between the early warning device and the screw hole, when the first shell 11 is located at the second position, the compression force of the bolt directly acts on the upper surface of the main body 61, and meanwhile, the compression force can also indirectly act on the limiting piece 70, so that the limiting piece 70 is fixed and cannot rotate, the teeth of the limiting piece 70 limit the mounting piece 40 from rotating, and then the first shell 11 cannot return to the first position from the second position, and the driving piece 50 always presses the elastic piece 30; when the bolt is loosened, the pressing force of the bolt cannot completely fix the limiting piece 70, the elastic piece 30 releases elastic force to push the driving piece 50 and the mounting piece 40 to move, and the limiting piece 70 cannot prevent the ring piece 4 from rotating, namely, the limiting piece 70 loses the limiting effect, so that the first shell 11 can rotate from the second position to the first position.

The teeth on the outer peripheral surface of the limiting piece 70 and the clamping piece 80 are combined to form a limiting structure of the ratchet pawl, so that the limiting effect is realized. The stopper 80 is elastically provided, and specifically, the stopper 80 is made of an elastic steel material. When the limiting member 70 is pressed and fixed by the bolt, and the first shell 11 rotates from the first position to the second position, the blocking member 80 can correspondingly change shape along the outer side surface of the tooth.

As shown in fig. 4 and fig. 9 to fig. 10, the warning device 3 further includes a second fixing member 90. The second fixing member 90 is located below the limiting member 70, the second fixing member 90 is connected with the second shell portion 12, the second fixing member 90 is further connected with the first fixing member 60, and the first fixing member 60, the second fixing member 90 and the second shell portion 12 are all in a static state relative to other components. The first fixing member 60, the limiting member 70, and the second fixing member 90 are provided with through holes for the bolts to pass through. The limiting piece 70 is arranged between the first fixing piece 60 and the second fixing piece 90, gaps are reserved between the limiting piece 70 and the first fixing piece 60 and between the limiting piece 70 and the second fixing piece 90, and when the early warning device 3 is in a working state, the first fixing piece 60, the limiting piece 70 and the second fixing piece 90 are compressed by the compression force of the bolts, so that the gaps disappear, and the limiting piece 70 cannot rotate.

In the embodiment disclosed in the present application, before the bolt is loosened, the first fixing member 60, the limiting member 70 and the second fixing member 90 may be used as gaskets, but not limited to, for primarily preventing the bolt from loosening; when the bolt loosens, the early warning device 3 is used for early warning to the outside, and the staff is reminded that the bolt has slightly loosened.

Further, the edge of the second fixing member 90 near the through hole is arranged in an arc shape, the second fixing member 90 is elastically arranged, the second fixing member 90 is equivalent to a disc spring, but the compression capacity and rigidity of the second fixing member 90 are far greater than those of a common disc spring.

The early warning device 3 provided by the application is used for testing the contact resistance of the wire clamp in a use scene, and the test shows that when the early warning device 3 generates an early warning signal, the contact resistance of the wire clamp has no obvious change, and the device can play a role in preventing the wire clamp from heating.

In the early warning device 3 according to an embodiment of the present application, when not in use (initial state), the first housing part 11 can be rotated from the first position to the second position, and then the first housing part 11 can be immediately rotated back from the second position to the first position due to the elastic force released by the elastic member 30. When the bolt compresses the early warning device 3 and the bolt is not loosened, the compressing force of the bolt compresses the first fixing member 60, the limiting member 70 and the second fixing member 90, and at this time, the limiting member 70 is compressed and fixed, and when the first shell portion 11 rotates from the first position to the second position, due to the arrangement of the teeth and the clamping member 80, the driving member 50 always presses the elastic member 30, and the elastic member 30 cannot release elasticity, so that the first shell portion 11 cannot return to the first position (working state) from the second position. When the bolt is loosened, the pressing force of the bolt is insufficient to press the limiting member 70, and at this time, the limiting effect of the limiting member 70 fails, and the elastic member 30 can release the elastic force to push the driving member 50 to move, so that the first housing portion 11 can swing from the second position to the first position (early warning state).

The using process of the device is as follows:

firstly, a rod part of a bolt passes through a common gasket, then the rod part of the bolt passes through a through hole, and the bolt is locked into a screw hole of an electric device (the device is locked between the common gasket and the screw hole, and the common gasket can prevent a worker from touching the first shell part 11 to cause abrasion on the first shell part 11 in the process of locking the bolt by a spanner);

the first housing portion 11 is rotated clockwise from the first position to the second position.

Assuming that the locking torque of the bolt is 100, when the locking force of the bolt is reduced to 60% (the early warning torque value) of the initial locking torque, the first shell 11 rotates from the second position to the first position, the early warning part 22 is exposed out of the covering part 21, and the early warning part 22 can prompt early warning information to a worker, so that the bolt is loosened at this time. The early warning torque value can be set according to the actual needs of users or the use environment; for the anti-leakage occasion, the early warning torsion value that needs to be set up can be bigger, and for the anti-loosening occasion, the early warning torsion that needs to be set up is less to the requirement.

Referring to fig. 11, in another embodiment, the warning device 3 includes a first housing portion 11, a second housing portion 12, a cover portion 21, a warning portion 22, an elastic member 30, a mounting member 40, a driving member 50, a first fixing member 60, a stopper 70, a stopper 80, and a second fixing member 90. The first fixing member 60 is fixedly connected with the first shell portion 11, the second fixing member 90 is fixedly connected with the second shell portion 12, the first shell portion 11 is fixedly connected with the second shell portion 12, the mounting member 40 is disposed between the first shell portion 11 and the second shell portion 12, and the mounting member 40 is rotatable relative to the second shell portion 12. The blocking member 80 is mounted on one side of the driving member 50 near the limiting member 70, the driving member 50 is mounted on the inner side of the mounting member 40, the covering portion 21 is disposed on the outer side of the mounting member 40, the second housing portion 12 is provided with a blocking piece 121, one end of the elastic member 30 is connected with the driving member 50, the other end of the elastic member 30 abuts against the blocking piece 121, and when the covering portion 21 (around the central axis of the mounting member 40) rotates from the first position to the second position, the driving member 50 can press the elastic member 30.

The second housing part 12 is provided with a slot for accommodating the cover part 21, the slot comprising a third side wall and a fourth side wall arranged opposite to each other, the cover part 21 being rotatable in the slot relative to the second housing part 12, the cover part 21 being in a first position, the third side wall being in abutment with the driving member 50, and the cover part 21 being in a second position, the fourth side wall being in abutment with the driving member 50. The third side wall and the fourth side wall of the notch are propped against the covering part 21 and used for limiting the rotation position of the covering part 21, and when the third side wall or the fourth side wall touches the covering part 21, the rotation of the covering part 21 is stopped and the rotation can not be continued.

In this embodiment, the first shell portion 11, the first fixing member 60, the second fixing member 90 and the second shell portion 12 are fastened, only the second shell portion 12 is provided with a slot for sliding the covering portion 21, and compared with the previous embodiment, the structure of this embodiment enables the path side length of the dust entering, and effectively reduces the gap for entering the dust.

In some embodiments, the structures of the first shell portion 11, the second shell portion 12, the cover portion 21, the warning portion 22, the elastic member 30, the mounting member 40, the driving member 50, the limiting member 70, the positioning member 80, and the second fixing member 90 may be the same as those of the previous embodiment, and it is understood that different structures may be used.

In this embodiment, the use process of the early warning device is as follows:

the cover portion 21 is rotated clockwise from the first position to the second position (in this process, the mounting member and the cover portion simultaneously rotate around the central axis of the mounting member, the driving member follows the movement, and at this time, the driving member presses the elastic member, and the retaining member slides along the outer side surface of the tooth and can abut against the tooth, because of the pressing force of the bolt, the retaining member 70 is stationary, and the tooth of the retaining member 70 engages with the retaining member 80 to restrict the rotation direction of the first shell portion 11, so that the first shell portion 11 can only rotate from the first position to the second position, in which process the first shell portion 11 cannot return to the first position, and at this time, the elastic member 30 is always kept in the pressed state, and at this time, the bolt is not loosened).

Assuming that the locking torque of the bolt is 100, when the locking force of the bolt is reduced to 60% of the initial locking torque (when the environmental pressure value to which the limiting member 70 is subjected is reduced to a preset pressure value, that is, when the bolt is loosened, the limiting member 70 is not completely compressed by the bolt, at this time, the limiting member 70 can freely move, the elastic member 30 can release the compressed elastic force, which acts on the driving member 50 to push the driving member 50 to move, further, in the process of pushing the driving member 50 to move by the elastic force released by the elastic member 30, the mounting member 40 rotates around the central axis thereof, the blocking member 80 follows the mounting member 40, and since the limiting member 70 is not completely compressed by the bolt, the elastic force released by the elastic member 30 can urge the blocking member 80 to push the teeth reversely, so that the limiting member 70 rotates, that is, at this time, the limiting member 70 loses the limiting function, finally, under the elastic force of the elastic member 30, the elastic member, the covering portion 21 can rotate from the second position to the first position, the elastic member 21 is rotated from the second position to the first position, the elastic member 22 is exposed to the driving member 50, further, the elastic member 22 is moved, and the early warning portion 22 is able to prompt the worker that the early warning information has been generated, because the early warning that the bolt is loosened.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims

1. An early warning device for preventing loosening of fasteners, comprising:

a housing including a first housing portion and a second housing portion connected to the first housing portion;

the early warning piece comprises an early warning part and a covering part, the early warning part is connected with the second shell part, the covering part is arranged at intervals with the early warning part, and the covering part can rotate from a first position to a second position relative to the early warning part; when the shielding part is at the first position, the orthographic projection of the shielding part and the early warning part along the first direction is at least partially misaligned, so that the early warning part can prompt early warning information to the outside; when the shielding part is at the second position, orthographic projection of the shielding part and the early warning part along the first direction are overlapped, so that the shielding part can cover the early warning part, and the first direction is perpendicular to the plane where the early warning part is positioned;

an elastic member disposed between the first and second housing portions, the elastic member configured to urge the cover portion to rotate from the second position to the first position;

the early warning device further comprises a mounting piece and a driving piece, wherein the mounting piece is arranged between the first shell part and the second shell part, the driving piece is arranged on the mounting piece, one end of the elastic piece is connected with the driving piece, and when the covering part rotates, the driving piece can squeeze the elastic piece;

the early warning device further comprises a first fixing piece, the first fixing piece comprises a main body portion and a fixing portion connected with the main body portion, the main body portion is arranged between the second shell portion and the mounting piece, the mounting piece is provided with a containing groove, the fixing portion penetrates through the containing groove to extend to the outside of the mounting piece, and the elastic piece is connected between the driving piece and the fixing portion.

2. The warning device for preventing loosening of fasteners as defined in claim 1, wherein said cover portion is coupled to said first housing portion, said first housing portion is rotatably coupled to said second housing portion, and said mounting member is coupled to said first housing portion.

3. The warning device for preventing loosening of fasteners as defined in claim 2, wherein said receiving slot includes oppositely disposed first and second side walls, said cover portion being in said first position with said first side wall abutting said fixed portion, said cover portion being in said second position with said second side wall abutting said fixed portion.

4. The early warning device for preventing loosening of a fastener according to claim 2, further comprising a stopper and a stopper, the stopper being provided inside the mounting member, the outer peripheral surface of the stopper being provided with teeth, the stopper being provided in the mounting member and being capable of abutting against the teeth; when the cover part is at the second position, the limiting part is subjected to external pressure, and the teeth are used for preventing the clamping part from moving so as to keep the elastic part in a pressed state; when the external pressure is reduced to a preset pressure value, the limiting piece can enable the elastic piece to release elastic force so as to rotate the covering portion from the second position to the first position.

5. The warning device for preventing loosening of a fastener as claimed in claim 2, further comprising a stopper and a second fixing member, wherein the first fixing member is connected to the second housing portion by means of the second fixing member, the stopper is disposed between the first fixing member and the second fixing member, and the first fixing member, the stopper, and the second fixing member are each provided with a through hole for the fastener to pass through.

6. An early warning device for preventing loosening of fasteners, comprising:

the early warning device further comprises a mounting piece and a driving piece, wherein the mounting piece is arranged between the first shell part and the second shell part, the driving piece is arranged on the mounting piece, and when the covering part rotates, the driving piece can squeeze the elastic piece;

the early warning device further comprises a first fixing piece, the first fixing piece is fixedly connected with the first shell part, the first shell part is fixedly connected with the second shell part, the second shell part is provided with a baffle, one end of the elastic piece is connected with the driving piece, and the other end of the elastic piece abuts against the baffle.

7. The warning device for preventing loosening of a fastener as claimed in claim 6, further comprising a stopper and a second fixing member, wherein the first fixing member is connected to the second housing portion by means of the second fixing member, the stopper is disposed between the first fixing member and the second fixing member, and the first fixing member, the stopper, and the second fixing member are each provided with a through hole for the fastener to pass through.

8. The warning device for preventing loosening of fasteners as claimed in claim 6, wherein said cover portion is connected to said mounting member, said mounting member being rotatable relative to said second housing portion.

9. The warning device for preventing loosening of fasteners as claimed in claim 6, wherein the second housing portion is provided with a slot for receiving the cover portion, the slot including oppositely disposed third and fourth side walls, the cover portion being rotatable relative to the second housing portion in the slot, the third side wall abutting the cover portion when the cover portion is in the first position and the fourth side wall abutting the cover portion when the cover portion is in the second position.

10. An electrical power system comprising a fastener, an electrical device, and an early warning device for preventing loosening of the fastener according to any one of claims 1 to 9, wherein the early warning device is disposed between the fastener and the electrical device.