Bolt looseness detection device

Abstract

The utility model provides a bolt looseness detection device, and relates to the technical field of part detection, the device comprises a conductive fixing ring, the conductive fixing ring is sleeved on the outer side of a bolt, and the conductive fixing ring is provided with a contact boss; the rotating cap is arranged on a nut or a bolt column head, a conductive reed is arranged on the rotating cap, the conductive reed is in contact with the contact boss to form a detection circuit, and the detection circuit is used for being electrically connected with a detection assembly. A rotary cover and a conductive reed are arranged on a bolt column head / nut, and a conductive fixing ring is arranged on a fastened piece, so that a closed detection circuit can be formed by the conductive reed and the conductive fixing ring when a bolt is fastened; once the bolt is loosened, the conductive reed is driven to be separated from the conductive fixing ring, the detection circuit is immediately switched off, and the loosening condition of the bolt can be detected by monitoring the on-off state of the detection circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of parts detection, in particular to a bolt loosening detection device. Background Art

[0002] Bolted connections are the most widely used connection method in engineering practice. Bolts can experience fatigue damage and loosening under cyclic loads and forced vibration. Once a bolt loosens, the tightening effect fails, which can have serious consequences. Therefore, it is necessary to detect the degree of bolt loosening in engineering.

[0003] Existing bolt loosening detection methods mainly include the use of piezoelectric sensors, electromagnetic waves / ultrasonic waves, optical principles, and electromagnetic induction coils. However, these existing detection methods have defects such as high power consumption, susceptibility to environmental interference, or restrictions on the size and shape of bolts. Therefore, it is urgent to propose a new bolt loosening detection solution to solve the problems of existing technologies. Utility Model Content

[0004] The purpose of this utility model is to provide a bolt loosening detection device to improve the above problem. In order to achieve the above purpose, the technical solution adopted by this utility model is as follows:

[0005] The present application provides a bolt loosening detection device, comprising:

[0006] A conductive fixing ring, which is sleeved on the outer side of the bolt and has a contact boss;

[0007] A rotating cap is provided on the nut or bolt stud, and a conductive spring is provided on the rotating cap. The conductive spring contacts the contact boss to form a detection circuit, and the detection circuit is used to be electrically connected to the detection component.

[0008] Optionally, the conductive fixing ring includes a first wedge-shaped gasket and a second wedge-shaped gasket;

[0009] The first wedge-shaped washer is fixed to the bolt stud or the nut, and the second wedge-shaped washer is fixed to a fastener, wherein the fastener is an object fixed by the bolt;

[0010] The first wedge-shaped gasket is provided with a first wedge-shaped tooth, and the second wedge-shaped gasket is provided with a second wedge-shaped tooth, and the first wedge-shaped tooth and the second wedge-shaped tooth are engaged with each other;

[0011] The included angles between the first wedge-shaped teeth, the second wedge-shaped teeth and the plane of the conductive fixing ring are greater than the thread angle of the bolt.

[0012] Optionally, the first wedge-shaped washer is provided with first fine teeth on a surface facing the bolt stud or nut;

[0013] The second wedge-shaped washer is provided with second fine teeth on a surface facing the fastened member.

[0014] Optionally, the device further comprises a fixing cap, and the rotating cap is arranged on the stud of the nut or bolt through the fixing cap;

[0015] The fixing cap is provided with a fixing groove, and the nut or bolt stud is fixed in the fixing groove;

[0016] The rotating cap is buckled onto the fixed cap, a first constraint structure is provided on the outer side of the fixed cap, and a second constraint structure is provided on the inner side of the rotating cap. The second constraint structure limits the first structure through structural limitation or friction limitation, so that the rotational resistance between the second constraint structure and the first structure is greater than the rotational resistance between the conductive spring and the contact boss.

[0017] Optionally, one end of the fixing cap that contacts the rotating cap is provided with a chamfer or a rounded corner.

[0018] Optionally, the detection component includes a power supply, a processing circuit and an alarm module;

[0019] The power supply is connected to the detection circuit to form a power-on loop;

[0020] The processing circuit is connected to the power-on circuit, and the processing circuit is configured to obtain an on / off signal of the power-on circuit;

[0021] The alarm module is connected to the processing circuit.

[0022] Optionally, one end of the conductive spring is connected to the side of the rotating cap, and the other end is provided with a U-shaped slot, and the contact boss is snapped into the U-shaped slot;

[0023] The opening direction of the U-shaped slot is opposite to the loosening rotation direction of the screw or nut.

[0024] Optionally, the fastened component is made of a conductive material, and the conductive reed, the conductive fixing ring and the fastened component are connected in sequence to form a detection circuit.

[0025] Optionally, the conductive reed includes a first conductive reed and a second conductive reed;

[0026] The contact boss includes a first contact boss and a second contact boss;

[0027] The first conductive spring contacts the first contact boss, and the second conductive spring contacts the second contact boss.

[0028] Optionally, an insulating layer is provided on a side of the conductive fixing ring away from the rotating cap, and the first conductive reed, the conductive fixing ring and the second conductive reed are connected in sequence to form a detection circuit.

[0029] The beneficial effects of the utility model are:

[0030] This application provides a rotating cover and a conductive spring on the bolt stud / nut, and a conductive retaining ring on the fastener, so that when the bolt is tightened, the conductive spring and the conductive retaining ring form a closed detection circuit. Once the bolt loosens, the conductive spring will be driven away from the conductive retaining ring, and the detection circuit will immediately disconnect. By monitoring the on-off state of the detection circuit, the loosening of the bolt can be detected. Compared with existing bolt loosening detection devices, this utility model has a simple circuit, low wiring requirements, low installation and use costs, a wide range of applications, and is not easily affected by external environmental interference.

[0031] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by implementing embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 This is a schematic structural diagram of a bolt loosening detection device in an embodiment of the present application;

[0034] Figure 2 Schematic diagram of the structure of the first wedge-shaped gasket and the second wedge-shaped gasket in the embodiment of the present application;

[0035] Figure 3 This is a schematic diagram of the ring structure in the embodiment of the present application;

[0036] Figure 4 This is a schematic diagram of the structure of a rotating cap in the form of a clamp in an embodiment of the present application;

[0037] Figure 5 This is a schematic diagram of the U-shaped slot structure in an embodiment of the present application;

[0038] Figure 6 This is a schematic diagram of the spring sheet (side compression) structure in the embodiment of the present application;

[0039] Figure 7This is a schematic diagram of the structure of the spring sheet (upper surface pressed) in the embodiment of the present application;

[0040] Figure 8 This is a schematic diagram of the detection component structure in the embodiment of the present application;

[0041] Figure 9 Schematic diagram of a detection circuit formed by a conductive spring, a conductive fixing ring, and a fastened component in an embodiment of the present application;

[0042] Figure 10 This is a schematic diagram of the insulating layer arrangement in an embodiment of the present application.

[0043] Markings in the figure: 100, conductive fixing ring; 110, contact boss; 111, first contact boss; 112, second contact boss; 120, first wedge-shaped gasket; 130, second wedge-shaped gasket; 131, second wedge-shaped tooth; 140, ring member; 200, bolt; 210, bolt stud; 300, rotating cap; 310, flexible ratchet plate; 320, locking member; 400, nut; 500, conductive spring; 510, U-shaped slot; 520, first conductive spring; 530, second conductive spring; 540, spring piece; 600, fastener; 700, fixing cap; 710, ratchet tooth; 720, chamfer; 800, detection component; 810, power supply; 820, processing circuit; 821, wireless communication module; 830, alarm module; 900, insulation layer. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for protection, but merely represents selected embodiments of the present invention. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0045] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of this utility model, the terms "first", "second", etc. are used only to distinguish the description and should not be understood as indicating or implying relative importance.

[0046] The main bolt loosening detection technologies available on the market are as follows:

[0047] (1) Use color changes or mechanical signs to indicate the loosening status of the bolt (anti-loosening mark). The disadvantage of this technology is that it can only provide qualitative indications and requires manual regular inspections, and cannot achieve real-time monitoring.

[0048] (2) Use a resistance strain gauge or piezoelectric sensor to measure the tension or stress of the bolt and determine whether the bolt is loose based on a preset threshold. The disadvantage of this technology is that the resistance strain gauge or piezoelectric sensor is easily affected by the environment, the signal is easily interfered with, and the installation and maintenance costs are high, making it unsuitable for large-scale use.

[0049] (3) Using electromagnetic waves or ultrasonic waves to generate excitation signals inside the bolt, the characteristic parameters of the received signal, such as amplitude, frequency, and phase, are used to reflect the tightness of the bolt. The disadvantage of this technology is that it requires specialized equipment and operators, and is limited to the size and shape of the bolt, so it cannot be applied to all types of bolts.

[0050] (4) Use optical principles (similar to photoelectric mouse) to measure and calculate the bolt rotation angle, thereby inferring the bolt tension or stress to achieve bolt loosening monitoring. The advantages of this technology are lightness and easy installation; but the disadvantages are high energy consumption and high cost;

[0051] (5) Using the principle of frequency changes caused by the relative position changes of electromagnetic induction coils, the bolt rotation angle is measured and calculated, thereby inferring the tension or stress of the bolt and realizing bolt loosening monitoring. The disadvantages of this technology are high energy consumption and high cost. For details, please refer to Chinese patent CN202410177794.

[0052] (6) Using memory metal strain switches to measure preload and then monitor bolt loosening. The advantage of this technology is its compact structure, but its disadvantages are difficult processing, high cost, and poor weather resistance.

[0053] Therefore, the existing bolt loosening monitoring devices on the market have certain limitations and cannot meet the demand for efficient, reliable and intelligent monitoring of bolt fasteners in modern industrial production.

[0054] like Figure 1 As shown, this embodiment provides a device for detecting a loose bolt 200, comprising:

[0055] A conductive fixing ring 100 is sleeved on the outer side of the bolt 200 and is provided with a contact boss 110;

[0056] The rotating cap 300 is arranged on the nut 400 or the bolt stud 210 . The rotating cap 300 is provided with a conductive spring 500 . The conductive spring 500 contacts the contact boss 110 to form a detection circuit. The detection circuit is used to be electrically connected to the detection component 800 .

[0057] The conductive spring 500 and the contact boss 110 have a certain contact travel distance. This means the conductive spring 500 and the contact boss 110 can move relative to each other over a certain distance while maintaining contact within this distance, thereby keeping the detection circuit closed and allowing the detection assembly 800 to continuously detect the circuit closed signal. When the bolt 200 loosens, the rotating cap 300 rotates a certain angle following the nut 400 or the bolt stud 210, causing the conductive spring 500 to rotate as well. This causes the conductive spring 500 to disengage from the contact boss 110, disconnecting the detection circuit. At this point, the detection assembly 800 detects the circuit disconnect signal, indicating that the bolt 200 is loose.

[0058] like Figure 2 As shown, as an optional embodiment, the conductive fixing ring 100 includes a first wedge-shaped gasket 120 and a second wedge-shaped gasket 130;

[0059] The first wedge-shaped washer 120 is fixed to the bolt stud 210 or the nut 400, and the second wedge-shaped washer 130 is fixed to the fastener 600 acted upon by the bolt 200;

[0060] The first wedge-shaped washer 120 is fixed to the bolt stud 210 or the nut 400, and the second wedge-shaped washer 130 is fixed to the fastener 600, which is an object fixed by the bolt 200;

[0061] The first wedge-shaped gasket 120 is provided with a first wedge-shaped tooth, and the second wedge-shaped gasket 130 is provided with a second wedge-shaped tooth 131, and the first wedge-shaped tooth and the second wedge-shaped tooth 131 are embedded in each other;

[0062] That is, the first wedge-shaped washer 120 and the second wedge-shaped washer 130 are interlocked and overlapped to form a conductive fixing ring 100 , and the upper and lower surfaces of the conductive fixing ring 100 are fixed to the bolt stud 210 / nut 400 and the fastener 600 respectively.

[0063] The included angle α between the first and second wedge-shaped teeth 131 and the plane of the conductive fixing ring 100 is greater than the thread angle β of the bolt 200. When the bolt 200 tends to loosen due to the thread angle β being less than the wedge-shaped tooth angle α, the bolt 200 will need to overcome greater resistance to loosen. Specifically, a single wedge-shaped gasket is used as the object of force analysis:

[0064] When nut 400 (and bolt 200 for that matter) begins to loosen due to rotation, the external force (vibration, etc.) causing the loosening is transmitted from the material of nut 400 (or fastener 600, bolt stud 210) to the wedge-shaped tooth structure. Because the angle α of the wedge-shaped tooth is greater than the thread angle β, there is an angle difference, and circumferential rotation causes axial displacement. At this time, bolt 200 itself cannot move axially. Therefore, the force that needs to be overcome to loosen bolt 200 is the stress generated by the elongation of bolt 200 itself (caused by the axial displacement tendency). Therefore, by using this conductive fixing ring 100 composed of wedge-shaped washers, an additional anti-loosening effect can be achieved.

[0065] Specifically, the first wedge-shaped gasket 120 and the second wedge-shaped gasket 130 can be fixed to the fastener 600, the bolt stud 210 / the nut 400 by bonding, welding or biting. The principle is to ensure that when there is a loosening tendency caused by external force (vibration, etc.), the connection between the wedge-shaped gasket and the nut 400 (or the fastener 600, the bolt stud 210) will not be displaced or deformed.

[0066] As an optional embodiment, the first wedge-shaped washer 120 is provided with first fine teeth on the surface facing the bolt stud 210 or the nut 400, and the first fine teeth engage with the bolt stud 210 or the nut 400 to maintain relative fixation;

[0067] The second wedge-shaped washer 130 is provided with second fine teeth on the surface facing the fastened member 600 , and the second fine teeth are engaged with the fastened member 600 to maintain relative fixation.

[0068] The hardness of the first and second serrations must be greater than that of the nut 400 (or the fastener 600, or the bolt stud 210). When installing the wedge-shaped washer, the serrations can be embedded by applying pressure (e.g., tightening the bolt 200 / nut 400). This causes corresponding deformation of the surfaces of the bolt stud 210 / nut 400 / fastener 600. Under the action of a loosening force, the material (of the fastener 600, bolt 200, or nut 400) where the serrations engage will not deform or cause relative displacement.

[0069] The first wedge-shaped washer 120 and the second wedge-shaped washer 130 are preferably installed on both sides of the fastener 600, that is, the overlapping order is the bolt stud 210, the conductive fixing ring 100, the fastener 600, the conductive fixing ring 100, and the nut 400. It is also foreseeable that the bolt 200 and the nut 400 need to be removed before installing the first wedge-shaped washer 120 and the second wedge-shaped washer 130. Therefore, this solution is suitable for situations where the bolt 200 is removable, or when the detection device of the present application is installed when the bolt 200 is installed.

[0070] like Figure 3 As shown, in another embodiment, the conductive fixing ring 100 can be a simple ring member 140. The inner diameter of the ring member 140 is larger than the outer diameter of the bolt stud 210 / nut 400, allowing the ring member 140 to be directly inserted over the bolt stud 210 / nut 400 and then secured to the fastener 600. The ring member 140 can be fixed by bonding, welding, riveting, or interlocking. The ring member 140 solution is suitable for equipment where the bolt 200 is already installed and cannot be removed. The detection device of this application can be installed without removing the bolt 200.

[0071] If the ring 140 is fixed by bonding, it is preferred to open a plurality of axial holes on the ring 140 to effectively increase the circumferential strength between the cured adhesive and the ring 140.

[0072] As an optional implementation, Figure 2 and Figure 3 As shown, the device further includes a fixing cap 700, and the rotating cap 300 is set on the nut 400 or the bolt stud 210 through the fixing cap 700;

[0073] The fixing cap 700 is provided with a fixing groove, in which the nut 400 or the bolt stud 210 is fixed; the shape and size of the fixing groove match the nut 400 or the bolt stud 210, and the fixing groove and the nut 400 or the bolt stud 210 are fixed circumferentially and axially by interference fit, bonding or riveting.

[0074] The rotating cap 300 is buckled onto the fixed cap 700. A first constraint structure is provided on the outer side of the fixed cap 700, and a second constraint structure is provided on the inner side of the rotating cap 300. The second constraint structure limits the first structure through structural limitation or friction limitation, so that the rotational resistance between the second constraint structure and the first structure is greater than the rotational resistance between the conductive spring 500 and the contact boss 110.

[0075] Specifically, in this embodiment, the first constraint structure is a ratchet tooth 710 provided on the outside of the fixed cap 700, and the second constraint structure is a flexible ratchet piece 310 provided on the inside of the rotating cap 300. Figure 4 and Figure 5 As shown, the tooth shape direction of the ratchet teeth 710 is opposite to the extension direction of the flexible ratchet piece 310;

[0076] The tooth profile direction of the ratchet teeth 710 is the same as the loosening rotation direction of the screw or nut 400 .

[0077] After the rotating cap 300 is installed on the fixed cap 700, the flexible ratchet piece 310 is inserted into the gap between the ratchet teeth 710. When the rotating cap 300 tends to rotate in the direction of the tooth profile of the ratchet teeth 710, it will be resisted by the flexible ratchet piece 310, and the rotation will be restricted. When the rotating cap 300 tends to rotate in the direction opposite to the tooth profile of the ratchet teeth 710, the rotation is along the extension direction of the flexible ratchet piece 310, so the rotation will not be restricted. It can be seen that by providing the ratchet teeth 710 and the flexible ratchet piece 310, the one-way rotation of the rotating cap 300 relative to the fixed cap 700 is achieved. When the rotating cap 300 is installed, the rotating cap 300 can be adjusted by one-way rotation so that the conductive spring 500 on the rotating cap 300 is properly in contact with the contact boss 110. When the bolt 200 is loosened, the fixing cap 700 rotates. Since the fixing cap 700 and the flexible ratchet piece 310 are in contact with each other, and the resistance is greater than the friction between the conductive spring 500 and the contact boss 110, the fixing cap 700 will simultaneously drive the rotating cap 300 to rotate, and the conductive spring 500 will be displaced until it is separated from the contact boss 110, and the detection circuit is disconnected.

[0078] like Figure 2 and Figure 3 As shown, in order to facilitate the installation of the rotating cap 300, a chamfer 720 is provided on the end of the fixed cap 700 that contacts the rotating cap 300. During installation, the flexible ratchet piece 310 is compressed and deformed under the guidance of the chamfer 720, so that the rotating cap 300 can be quickly buckled onto the fixed cap 700. The outer diameter of the largest part (bottom surface) of the chamfer 720 structure is greater than or equal to the outer diameter of the ratchet teeth 710. When the flexible ratchet piece 310 is inserted into the gap between the ratchet teeth 710, the flexible ratchet piece 310 is limited by the bottom surface of the chamfer 720 structure, thereby preventing the rotating cap 300 from disengaging in the axial direction.

[0079] In other embodiments, the first constraint structure can be a common tooth-shaped structure, and the second constraint structure can be an elastic limiting plate. The limiting plate is inserted into the gap of the tooth-shaped structure. When the external force of the bolt loosening is transmitted to the limiting plate, it is not enough to cause the limiting plate to deform significantly. The limiting plate has resistance to the tooth-shaped structure. Therefore, the rotation of the fixed cap 700 will cause the rotating cap 300 to rotate synchronously. When the rotating cap 300 is manually installed, the manually applied force is sufficient to cause the limiting plate to deform significantly under the pressure of the tooth-shaped structure, that is, the applied force is greater than the resistance of the limiting plate to the tooth-shaped structure. Therefore, the rotating cap 300 and the fixed cap 700 can rotate relative to each other, so that the rotating cap 300 can be adjusted to make the conductive spring 500 properly contact the contact boss 110. Alternatively, the first constraint structure and the second constraint structure can be two friction surfaces, and the friction resistance between the friction surfaces is greater than the friction resistance between the conductive spring 500 and the contact boss 110, which can also achieve the above-mentioned technical effects.

[0080] like Figure 4As shown, the rotating cap 300 of the present application can also be designed in the form of a clamp, that is, the side of the rotating cap 300 surrounds the bolt stud 210 / nut 400 and is locked and fixed with a locking member 320. A conductive spring 500 is provided on the locking member 320 or the rotating cap 300, so that the conductive spring 500 contacts the contact boss 110 to form a detection circuit.

[0081] The number of the conductive spring 500 and the contact boss 110 can be one or more.

[0082] As an embodiment, a conductive spring 500 and a contact boss 110 are respectively provided. One end of the conductive spring 500 is connected to the side of the rotating cap 300, and the other end is provided with a U-shaped slot 510. The contact boss 110 is snapped into the U-shaped slot 510.

[0083] The opening direction of the U-shaped slot 510 is opposite to the loosening rotation direction of the screw or nut 400 .

[0084] The structure of the U-shaped slot 510 is as follows Figure 5 As shown, the U-shaped slot 510 has a certain elasticity and can clamp the contact boss 110. When the screw or nut 400 rotates, the U-shaped slot 510 rotates, and the contact boss 110 gradually disengages from the opening of the U-shaped slot 510 until it is completely separated.

[0085] like Figure 6 and Figure 7 As shown, in addition to the U-shaped slot 510, the contact between the conductive spring 500 and the contact boss 110 can also be in a single-sided compression form, that is, a spring 540 is provided at the lower end of the conductive spring 500, and the spring 540 contacts one side or upper surface of the contact boss 110. The elastic deformation of the spring 540 generates a certain pressure on the contact boss 110, ensuring that the two will not separate under external interference (such as vibration).

[0086] like Figure 8 As shown, as an optional embodiment of the present application, the detection component 800 includes a power supply 810, a processing circuit 820 and an alarm module 830;

[0087] The power supply 810 is connected to the detection circuit to form a power circuit;

[0088] The processing circuit 820 is connected to the power-on circuit, and the processing circuit 820 is configured to obtain the on-off signal of the power-on circuit; the on-off signal can be obtained specifically by measuring the current or voltage of the power-on circuit, and the on-off signal can be output in a wired manner.

[0089] The processing circuit 820 may be a simple logic circuit or a more complex circuit, including an integrated circuit (chip) or a transistor.

[0090] The processing circuit 820 is used to control the overall operation of the detection assembly 800 to complete all or part of the steps in the above-mentioned method for detecting the loosening of the bolt 200.

[0091] Preferably, the processing circuit 820 includes a wireless communication module 821, which can send an alarm control signal to a remote device via wireless communication.

[0092] The alarm module 830 is connected to the processing circuit 820. When the processing circuit 820 determines that the power circuit is disconnected based on the obtained on / off signal, it sends an alarm control signal to the alarm module 830 to alert the operator that the bolt 200 is loose. The alarm module 830 is preferably provided on a remote monitoring device and is wirelessly connected to the processing circuit 820.

[0093] As an optional embodiment of the present application, the detection component 800 can also use radio frequency identification technology (RFID). The RFID tag is connected to the power circuit, and the chip of the RFID tag can detect the on-off of the circuit. The power supply 810 can specifically use an RFID antenna rectification and filtering module. A reader is set at the remote end to read the tag in real time. When the RFID tag receives the electromagnetic wave emitted by the reader, it can use the energy of the radio wave to rectify and filter and then provide power, so that the chip can obtain the on-off state of the detection circuit, and then feed the obtained circuit on-off information back to the reader via radio waves to realize the monitoring of the circuit on-off state. The energy consumption of RFID is very low, and compared with the existing technology, it can significantly reduce the use cost of the bolt loosening detection device.

[0094] The design of the detection circuit can be divided into two cases:

[0095] like Figure 9 As shown, if the fastened part 600 is made of conductive material and is grounded, and power is applied without affecting the use of the fastened part 600, the conductive spring 500, the conductive fixing ring 100 and the fastened part 600 can be connected in sequence to form a detection circuit.

[0096] like Figure 10As shown, in general, the conductive spring 500 can be designed to include a first conductive spring 520 and a second conductive spring 530; the contact boss 110 includes a first contact boss 111 and a second contact boss 112; the first conductive spring 520 contacts the first contact boss 111, and the second conductive spring 530 contacts the second contact boss 112, so that the first conductive spring 520, the conductive fixing ring 100 and the second conductive spring 530 are connected in sequence to form a detection circuit; optionally, if the power supply will affect the use of the fastener 600, an insulating layer 900 can be provided on the side of the conductive fixing ring 100 away from the rotating cap 300 to prevent the fastener 600 from being energized.

[0097] The detection device of the present application converts the displacement caused by the loosening of the bolt 200 into an on / off signal of the circuit. Compared with sensing technologies such as electromagnetic induction coils, electromagnetic waves, or optical principles, this device can effectively avoid the deviations and false alarms caused by sensor conversion and calculation. By adjusting the contact stroke between the conductive spring 500 and the contact boss 110, the threshold for determining whether the bolt 200 is loose can be set. The device of the present application has a simple circuit, low wiring requirements, low installation costs, and a wide range of applications.

[0098] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

[0099] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A bolt loosening detection device, characterized in that: include: A conductive fixing ring (100), the conductive fixing ring (100) is sleeved on the outer side of the bolt (200), and a contact boss (110) is provided on the conductive fixing ring (100); A rotating cap (300) is provided on a nut (400) or a bolt stud (210), and a conductive spring (500) is provided on the rotating cap (300). The conductive spring (500) contacts the contact boss (110) to form a detection circuit, and the detection circuit is used to be electrically connected to a detection component (800).

2. A bolt loosening detection device according to claim 1, characterized in that: The conductive fixing ring (100) comprises a first wedge-shaped gasket (120) and a second wedge-shaped gasket (130); The first wedge-shaped washer (120) is fixed to the bolt stud (210) or the nut (400), and the second wedge-shaped washer (130) is fixed to a fastener (600), wherein the fastener (600) is an object fixed by the bolt (200); The first wedge-shaped gasket (120) is provided with a first wedge-shaped tooth, and the second wedge-shaped gasket (130) is provided with a second wedge-shaped tooth (131), and the first wedge-shaped tooth and the second wedge-shaped tooth (131) are engaged with each other; The included angle between the first wedge-shaped teeth and the second wedge-shaped teeth (131) and the plane of the conductive fixing ring (100) is greater than the thread angle of the bolt (200).

3. A bolt loosening detection device according to claim 2, characterized in that: The first wedge-shaped washer (120) is provided with first fine teeth on a surface facing the bolt stud (210) or the nut (400); The second wedge-shaped gasket (130) is provided with second fine teeth on a surface facing the fastened member (600).

4. The bolt loosening detection device according to claim 1, characterized in that: The device further comprises a fixing cap (700), and the rotating cap (300) is arranged on the nut (400) or the bolt stud (210) through the fixing cap (700); The fixing cap (700) is provided with a fixing groove, and the nut (400) or the bolt stud (210) is fixed in the fixing groove; The rotating cap (300) is buckled onto the fixed cap (700), a first constraint structure is provided on the outer side of the fixed cap (700), and a second constraint structure is provided on the inner side of the rotating cap (300), the second constraint structure limits the first constraint structure through structural limitation or friction limitation, so that the rotational resistance between the second constraint structure and the first constraint structure is greater than the rotational resistance between the conductive spring (500) and the contact boss (110).

5. The bolt loosening detection device according to claim 4, characterized in that: One end of the fixing cap (700) that contacts the rotating cap (300) is provided with a chamfer (720) or a rounded corner.

6. The bolt loosening detection device according to claim 1, characterized in that: The detection component (800) includes a power supply (810), a processing circuit (820) and an alarm module (830); The power supply (810) is connected to the detection circuit to form a power supply circuit; The processing circuit (820) is connected to the power-on circuit, and the processing circuit (820) is configured to obtain an on / off signal of the power-on circuit; The alarm module (830) is connected to the processing circuit (820).

7. The bolt loosening detection device according to claim 1, characterized in that: One end of the conductive spring (500) is connected to the side of the rotating cap (300), and the other end is provided with a U-shaped slot (510), and the contact boss (110) is snap-connected in the U-shaped slot (510); The opening direction of the U-shaped slot (510) is opposite to the loosening rotation direction of the nut (400).

8. The bolt loosening detection device according to claim 2, characterized in that: The fastened part (600) is made of a conductive material, and the conductive spring (500), the conductive fixing ring (100) and the fastened part (600) are connected in sequence to form a detection circuit.

9. The bolt loosening detection device according to claim 1, characterized in that: The conductive spring (500) comprises a first conductive spring (520) and a second conductive spring (530); The contact boss (110) comprises a first contact boss (111) and a second contact boss (112); The first conductive spring (520) contacts the first contact boss (111), and the second conductive spring (530) contacts the second contact boss (112).

10. The bolt loosening detection device according to claim 9, characterized in that: An insulating layer is provided on a side of the conductive fixing ring (100) away from the rotating cap (300), and the first conductive spring (520), the conductive fixing ring (100) and the second conductive spring (530) are connected in sequence to form a detection circuit.

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