A bolt loosening detection device

Abstract

This utility model relates to the field of mechanical testing technology and discloses a bolt loosening detection device. The loosening detection component is threaded to both ends of the bolt. A loosening detection sensor is installed on the main body of the device to monitor the position of the nut on the bolt. A telescopic pressure rod is controlled by a controller based on sensor signals to extend and retract. A pressure ring is placed between the nut and the connecting part, working with the telescopic pressure rod to evenly distribute pressure. A sealing protective layer connects the main body base and the pressure ring, forming a sealed space to protect the internal components. This device can detect minute displacement changes of the nut on the bolt in real time, automatically control the telescopic pressure rod to initially reinforce the connecting part based on displacement changes, and protect the internal loosening detection sensor and nut. This reduces equipment maintenance and replacement costs, effectively improves the reliability of bolt connections, and allows the equipment to continue operating even when the bolts are loose.

Description

Technical Field

[0001] This utility model relates to the field of mechanical condition detection technology, specifically a bolt loosening detection device. Background Technology

[0002] In many fields such as engineering construction, industrial manufacturing, and transportation facilities, bolted connections are a common and fundamental mechanical connection method, widely used in various equipment and structures. However, due to the long-term exposure of equipment to impact, temperature changes, and complex stress environments, bolt loosening frequently occurs.

[0003] In fields with stringent requirements for connection precision, such as precision instrument manufacturing and automotive engine assembly, the stability of bolted connections is crucial to system safety and performance. Even minor loosening can lead to catastrophic failures such as blade imbalance and oil leakage. In precision instruments like lithography machines, high-precision bolted connections are fundamental to ensuring the stability of optical systems and achieving nanometer-level processing accuracy. Loose bolts can cause optical path misalignment, significantly reducing chip manufacturing yield. Similarly, in automotive engines, as core components, loose bolted connections in critical parts such as the cylinder block and cylinder head can not only affect power output but also potentially damage the engine.

[0004] To address the challenge of detecting loose bolts, various technical approaches have emerged. Some existing patents employ a method of placing a shield at the bottom of the nut within the bolt structure, and setting a boss and warning area on the same circumference of the washer. The bolt's looseness is determined by manually observing the position of the shield and the warning area. This method relies on manual inspection, which is not only inefficient but also highly susceptible to environmental factors (such as insufficient light or inclement weather), making real-time and accurate monitoring difficult. Another approach involves pre-installing electronic circuitry on the bolt to determine looseness based on electrical signal levels. However, this method requires specialized modification of the bolt, increasing both economic and time costs. Furthermore, the electronic equipment is susceptible to interference in complex environments, resulting in poor stability. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides a bolt loosening detection device that features high-precision real-time monitoring and dual protection capabilities. It solves the problems of traditional detection devices, such as difficulty in detecting minor loosening, insufficient protection, and inability to actively reinforce loosened bolts, leading to a high risk of equipment failure.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a bolt loosening detection device, comprising a loosening detection component, a bolt, a nut, and a connecting member, wherein the bolt passes through a through hole provided in the connecting member, the nut is threadedly connected to the end of the bolt extending out of the connecting member, and the loosening detection component is threadedly connected to both ends of the bolt, the loosening detection component comprising:

[0009] The detection device body is connected to the top cover by threads. A loosening detection sensor is fixedly installed on the side of the detection device body near the bolt. The loosening detection sensor is used to detect the position of the nut fixed on the bolt.

[0010] Several telescopic pressure rods are set on the side of the main body of the detection device near the nut. The controller controls the extension and retraction of the telescopic pressure rods according to the signal sent by the loosening detection sensor.

[0011] The top cover has a connecting post that penetrates through it. One end of the connecting post is connected to the main body of the detection device, and the other end is connected to the controller via a cable. The controller is located near the connecting part and in a position that facilitates wiring.

[0012] Preferably, the loosening detection component further includes a bearing ring, which has a through hole for the bolt to pass through. The bearing ring is disposed between the nut and the connector and is used to clamp the telescopic rod between the telescopic rod and the connector when the telescopic rod extends.

[0013] Preferably, the main body of the detection device includes:

[0014] The main body base is threadedly connected to one end of the top cover near the bolt, and the main body base is used for recycling and storing the telescopic pressure bar.

[0015] A sealing and protective layer is disposed between the loosening detection sensor and the telescopic pressure rod. One end of the sealing and protective layer is fixedly disposed on the side of the main body base near the bolt, and the other end is embedded in the annular groove provided on the pressure ring. The sealing and protective layer is used to cooperate with the pressure ring to seal and protect the loosening detection sensor and nut located inside.

[0016] Preferably, the main body base has the following features on the side near the loosening detection component:

[0017] A retraction hole penetrates the main body base. The shape and number of the retraction holes are adapted to the telescopic rod. The retraction holes are used to retain the telescopic rod when it retracts.

[0018] A central hole is provided at the projection position of the connecting post on the main body base, and the central hole is used to insert the connecting post.

[0019] A connecting groove is provided at the connection between the retraction hole and the center hole, and the connecting groove is used to connect the retraction hole and the center hole.

[0020] Preferably, the pressure ring is further provided with a buffer hole adapted to the telescopic pressure rod, the buffer hole being used to insert the end of the telescopic pressure rod.

[0021] Preferably, the buffer hole is a T-shaped cylindrical hole, and a buffer element is fixedly installed in the cylinder with a larger diameter on the side of the buffer hole near the connector. The buffer element is used to buffer the instantaneous impact force generated when the telescopic pressure rod protrudes to press the connector.

[0022] Preferably, the main body base has a connecting hole on the side near the nut, and the connecting hole is threaded for installing the loosening detection component on the bolt.

[0023] Preferably, both ends of the connector are provided with loosening detection components, and the loosening detection components on both sides are connected to the same controller via cables, which are used to control the extension and retraction of the telescopic pressure rod to tighten the connector when the loosening detection sensor detects the displacement of the nut.

[0024] Preferably, the loosening detection component is also equipped with a warning light, which is connected to the controller via a wire.

[0025] Preferably, the outer wall of the loosening detection component is provided with anti-slip texture, which is used to increase hand friction when installing or removing the loosening detection component.

[0026] (III) Beneficial Effects

[0027] Compared with the prior art, this utility model provides a bolt loosening detection device, which has the following beneficial effects:

[0028] 1. This bolt loosening detection device, by setting a detachable loosening detection component, has a loosening detection sensor installed on the side of the loosening detection component near the connector to detect the displacement of the nut and send the detection signal to the controller. It has the function of real-time detection of minute displacement changes of the nut on the bolt. Furthermore, by setting several telescopic pressure rods and a pressure ring located between the nut and the connector on the loosening detection component, when the controller receives the nut loosening signal, it can control the telescopic pressure rods to extend and tighten the connector, while the pressure ring evenly distributes the pressure, effectively preventing the connector from loosening further, so that the equipment can continue to work even when the bolt is loose.

[0029] 2. This bolt loosening detection device also features a sealing protective layer between the telescopic pressure rod and the loosening detection sensor on the loosening detection component. One end of the sealing protective layer is fixed to the sealing protective layer, and the other end is embedded in the annular groove on the pressure ring, forming a sealing barrier that effectively blocks external dust, moisture, and other impurities, protecting the internal loosening detection sensor and nut, reducing equipment maintenance and replacement costs, and ensuring the continuous and reliable operation of the loosening detection component. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the bolt loosening detection device of this utility model.

[0031] Figure 2 This is an exploded view of the bolt loosening detection device of this utility model.

[0032] Figure 3 This is a schematic diagram of the loosening detection component 1 of the bolt loosening detection device of this utility model.

[0033] Figure 4 This is a schematic diagram of the structure of the loosening detection component 1 of the bolt loosening detection device of this utility model when it is connected to one end of the bolt 3.

[0034] Figure 5 This is a schematic diagram of the structure when the loosening detection component 1 of the bolt loosening detection device of this utility model is connected to both ends of the bolt 3.

[0035] Figure 6 This is a structural schematic diagram of the loosening detection component 1 of the bolt loosening detection device of this utility model from one perspective.

[0036] Figure 7 This is a structural schematic diagram of the loosening detection component 1 of the bolt loosening detection device of this utility model from another perspective.

[0037] Figure 8 This is a schematic diagram of the bearing ring 13 of the bolt loosening detection device of this utility model.

[0038] In the diagram: 1. Loosening detection component; 2. Connector; 3. Bolt; 4. Nut;

[0039] 11. Top cover; 111. Connecting column; 112. Cable; 12. Detection device body; 120. Body base; 1201. Retraction hole; 1202. Center hole; 1203. Connecting groove; 121. Telescopic pressure rod; 122. Sealing and protective layer; 123. Loosening detection sensor; 124. Connecting hole;

[0040] 13. Pressure ring; 131. Buffer hole; 132. Through hole; 133. Annular groove. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0043] In addition, a fixed connection refers to a connection in which parts or components are fixed and there is no relative movement; a transmission connection refers to a connection in which mechanical motion or torque is transmitted to other working parts through a transmission component; a sliding connection refers to a connection in which two objects are in contact but not fixed and can slide relative to each other; and a rotational connection refers to a connection in which two objects are in contact but not fixed and can rotate relative to each other.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0045] Example 1:

[0046] This embodiment provides a bolt loosening detection device, which has the following technical features.

[0047] Please see Figure 1-8 A bolt loosening detection device includes a loosening detection component 1, a bolt 3, a nut 4, and a connecting member 2. The bolt 3 passes through a through hole provided in the connecting member 2. The nut 4 is threadedly connected to the end of the bolt 3 extending out of the connecting member 2. The loosening detection component 1 is threadedly connected to both ends of the bolt 3. The loosening detection component 1 includes:

[0048] The detection device body 12 is connected to the top cover 11 by threads. A loosening detection sensor 123 is fixedly installed on the side of the detection device body 12 near the bolt 3. The loosening detection sensor 123 is used to detect the position of the nut 4 fixed on the bolt 3.

[0049] Several telescopic pressure rods 121 are arranged on the side of the main body 12 of the detection device close to the nut 4. The controller controls the extension and retraction state of the telescopic pressure rods 121 according to the signal sent by the loosening detection sensor 123.

[0050] The top cover 11 has a connecting post 111 that penetrates through it. One end of the connecting post 111 is connected to the main body 12 of the detection device, and the other end is connected to the controller via a cable 112. The controller is located near the connector 2 and in a position that facilitates wiring.

[0051] It should be noted that during installation, first connect the connecting post 111 on the top cover 11 to the controller via the cable 112, and then screw the main body 12 of the detection device onto the top cover 11 via threads. The loosening detection sensor 123 adopts a laser displacement sensor to monitor the position change of the nut 4 on the bolt 3 in real time. Once the nut 4 shows loosening displacement, the sensor immediately transmits the signal to the controller through the connecting post 111. The controller determines whether to control the extension of the telescopic pressure rod 121 based on a preset threshold (displacement > 0.1mm). The telescopic pressure rod 121 is equipped with a motor. The controller controls the motor by sending an electrical signal. The motor drives the telescopic pressure rod 121 to extend, pressing the connecting piece 2 to prevent the bolt from loosening further, thus realizing timely early warning and initial emergency reinforcement of bolt loosening.

[0052] The controller operates on the principle of microprocessor technology, integrating a signal processing module, a data analysis module, and a control output module. The signal processing module receives the position signal transmitted from the looseness detection sensor 123 via cable 112, and performs preprocessing such as filtering and amplification to remove noise interference. The data analysis module compares the processed signal with the normal nut position parameters pre-stored in the controller's memory to determine whether the nut 4 is loose and the degree of looseness. Based on the data analysis module's judgment, the control output module outputs corresponding control signals to control the extension and retraction of the telescopic lever 121 and the illumination of the warning light. Simultaneously, the controller also has a communication interface, enabling data interaction with an external monitoring system for remote monitoring and management.

[0053] The controller should be installed in a location close to connector 2 and convenient for wiring, either inside the equipment's control cabinet or on a fixed bracket near connector 2. This installation location shortens the transmission distance of cable 112, reduces signal loss during transmission, and improves the timeliness and accuracy of signal transmission; it also facilitates wiring operations, parameter settings, and routine maintenance by staff.

[0054] During installation, use bolts to secure the controller to the mounting bracket and ensure that the controller is in a well-ventilated, dry environment free from strong electromagnetic interference to ensure its normal and stable operation.

[0055] In terms of power supply settings, a dual power supply mode is adopted, namely a main power supply and a backup power supply. The main power supply is the AC power of the equipment location, which is converted from 220V AC power to DC power required by the controller through a power adapter, powering the controller, loosening detection sensors 123, and other equipment; the backup power supply uses a rechargeable lithium battery pack. When the main power supply fails or is interrupted, the backup power supply automatically switches to continue powering the system, ensuring that the device can still work normally in case of emergencies and achieve continuous monitoring of bolt loosening.

[0056] In an optional embodiment, the loosening detection assembly 1 further includes a pressure ring 13, which has a through hole 132 for the bolt 3 to pass through. The pressure ring 13 is disposed between the nut 4 and the connector 2 and is used to clamp the telescopic rod 121 between the telescopic rod 121 and the connector 2 when the telescopic rod 121 is extended.

[0057] It should be noted that the pressure ring 13 is fitted onto the bolt 3 through the through hole 132 and placed between the nut 4 and the connector 2. When the telescopic pressure rod 121 extends under the control of the controller, the pressure ring 13 plays the role of evenly distributing the pressure, avoiding damage caused by the telescopic pressure rod 121 acting directly on the surface of the connector 2, and at the same time enhancing the fastening effect on the nut 4, so that the nut 4 can remain stable when subjected to loosening external force.

[0058] In an optional embodiment, the detection device body 12 includes:

[0059] The main body base 120 is threaded to one end of the top cover 11 near the bolt 3. The main body base 120 is used to retrieve and store the telescopic pressure rod 121.

[0060] A sealing and protective layer 122 is disposed between the loosening detection sensor 123 and the telescopic pressure rod 121. One end of the sealing and protective layer 122 is fixedly disposed on the side of the main body base 120 near the bolt 3, and the other end is embedded in the annular groove 133 provided on the pressure ring 13. The sealing and protective layer 122 is used to cooperate with the pressure ring 13 to seal and protect the loosening detection sensor 123 and the nut 4 located inside.

[0061] It should be noted that the main base 120 and the top cover 11 are connected by threads. The sealing and protective layer 122 is made of highly elastic and wear-resistant rubber. One end of the sealing and protective layer 122 is fixed to the side of the main base 120 near the bolt 3 by welding, and the other end is embedded in the annular groove 133 of the pressure ring 13, forming a sealing barrier. This effectively prevents external dust, moisture and other impurities from entering the detection device, protects the loose detection sensor 123 and nut 4 from corrosion, and ensures the long-term stable operation of the detection device.

[0062] In an optional embodiment, the main body base 120 is provided with the following on the side near the loosening detection component 1:

[0063] Retraction hole 1201 penetrates the main body base 120. The shape and number of retraction holes 1201 are adapted to the telescopic pressure rod 121. Retraction hole 1201 is used to save the telescopic pressure rod 121 when it is retracted.

[0064] The center hole 1203 is located at the projection position of the connecting post 111 on the main body base 120, and the center hole 1203 is used to insert the connecting post 111.

[0065] A connecting groove 1203 is provided at the connection between the retraction hole 1201 and the center hole 1203. The connecting groove 1203 is used to connect the connecting column 111 and the telescopic pressure rod 121.

[0066] It should be noted that the telescopic pressure rod 121 is inserted into the retraction hole 1201 to ensure that it can freely extend and retract within the hole. After the connecting post 111 is inserted into the center hole 1203, it is connected to the telescopic pressure rod 121 through the connecting groove 1203, so that the control signal of the controller can be smoothly transmitted to the telescopic pressure rod 121.

[0067] Meanwhile, the retraction hole 1201 provides storage space for the telescopic rod 121, which can be retracted into the hole when not in use to avoid taking up extra space and to prevent the telescopic rod 121 from being damaged by accidental collisions.

[0068] In an optional embodiment, the pressure ring 13 is further provided with a buffer hole 131 adapted to the telescopic pressure rod 121, the buffer hole 131 being used to insert the end of the telescopic pressure rod 121.

[0069] It should be noted that when the telescopic pressure rod 121 extends and tightens against the connector 2, its end is inserted into the buffer hole 131. The buffer hole 131 plays a positioning and guiding role, ensuring that the tightening force of the telescopic pressure rod 121 is evenly transmitted to the connector 2.

[0070] In an optional embodiment, the buffer hole 131 is a T-shaped cylindrical hole. A buffer element is fixedly installed in the cylinder with a larger diameter on the side of the buffer hole 131 near the connector 2. The buffer element is used to buffer the instantaneous impact force generated when the telescopic pressure rod 121 protrudes to press the connector 2.

[0071] It should be noted that the buffer is made of either elastic silicone or rubber. The buffer hole 131 is a T-shaped cylindrical hole, and the buffer is forcibly pressed into the larger diameter cylinder near the connector 2 using external force. When the telescopic pressure rod 121 extends quickly to press the connector 2, the buffer can effectively absorb and disperse the instantaneous impact force, preventing the connector 2 from deforming or being damaged due to excessive impact force. At the same time, it reduces the rigid collision between the telescopic pressure rod 121 and the pressure ring 13, extending the service life of the telescopic pressure rod 121 and the pressure ring 13.

[0072] In an optional embodiment, the main body base 120 is provided with a connecting hole 124 on the side near the nut 4, and the connecting hole 124 is provided with threads for mounting the loosening detection component 1 on the bolt 3.

[0073] It should be noted that when installing the loosening detection component 1, the connecting hole 124 on the main base 120 is aligned with the bolt 3, and the loosening detection component 1 is firmly installed on both ends of the bolt 3 by screwing it in. The thread in the connecting hole 124 is tightly engaged with the external thread of the bolt 3 to ensure the installation stability of the loosening detection component 1 on the bolt 3, prevent the loosening detection component 1 from falling off or shifting during the operation of the bolt 3, and ensure that the detection device can continuously and accurately monitor the loosening of the bolt 3.

[0074] In an optional embodiment, both ends of the connector 2 are provided with loosening detection components 1, and the loosening detection components 1 on both sides are connected to the same controller via cable 112, which is used to control the extension and retraction of the telescopic pressure rod 121 to press the connector 2 when the loosening detection sensor 123 detects the displacement of the nut 4.

[0075] It should be noted that during installation, loosening detection components 1 are installed on the bolts 3 at both ends of the connector 2, and the cables 112 of the loosening detection components 1 on both sides are connected to the same controller. In this way, no matter which end of the nut 4 of the connector 2 becomes loose, the loosening detection sensor 123 can transmit the signal to the controller in a timely manner. The controller then controls the telescopic pressure rods 121 on both sides to reinforce the connector 2 from both ends, improving the response speed and reinforcement effect of bolt loosening, and enhancing the overall stability of the connector 2 connection.

[0076] In an optional embodiment, the loosening detection component 1 is also provided with a warning light, which is connected to the controller via a wire.

[0077] It should be noted that when the loosening detection sensor 123 detects that the loosening displacement of nut 4 exceeds the preset threshold, the controller will not only control the telescopic pressure rod 121 to move, but also trigger the warning light to light up, visually alerting the staff by flashing the light, reminding them to deal with the loose bolt in time, and avoid safety accidents caused by loose bolts.

[0078] In an optional embodiment, the outer wall of the loosening detection component 1 is provided with anti-slip texture, which is used to increase hand friction when installing or removing the loosening detection component 1.

[0079] Working principle: When this bolt loosening detection device is working, the loosening detection sensor 123 (laser displacement sensor) monitors the position of the nut 4 on the bolt 3 in real time. When the nut 4 loosens and displaces due to external forces or other factors, and the displacement exceeds the preset threshold (0.1mm), the loosening detection sensor 123 transmits the detected signal to the controller through the connecting post 111 and the cable 112. After receiving the signal, the controller determines according to the preset program that the connection needs to be reinforced, and then sends an electrical signal to the motor on the telescopic rod 121, which drives the telescopic rod 121 to extend.

[0080] During the extension of the telescopic pressure rod 121, its end is inserted into the buffer hole 131 of the pressure ring 13, using the internal buffer (elastic silicone or rubber) to buffer the instantaneous impact force. At the same time, the pressure is evenly distributed to the connector 2 through the pressure ring 13, tightening the connector 2 from both ends to prevent the bolts from loosening further. The controller will also trigger the warning light to illuminate, reminding the staff to deal with it in time by flashing the light. In addition, the sealing protective layer 122 protects the internal loosening detection sensor 123 and nut 4 from external impurities.

[0081] When bolt 3 is not loose, only displacement sensor 123 of loosening detection component 1 works. Even if the connection between bolt 3 and nut 4 is loosened due to vibration or thermal expansion and contraction of connector 2, since loosening detection component 1 is directly connected to bolt 3 and does not contact connector 2, the working life of loosening detection component 1 is longer than that of bolt 3 and nut 4. This allows loosening detection component 1 to extend telescopic pressure rod 121 in time after the first line of defense, namely bolt 3 and nut 4, loosens, and promptly tighten connector 2 to prevent connector 2 from loosening further.

[0082] In summary, this bolt loosening detection device, by setting a detachable loosening detection component 1, and setting a loosening detection sensor 123 on the side of the loosening detection component 1 near the connector 2 to detect the displacement state of the nut 4, sends the detection signal to the controller, and has the function of real-time detection of minute displacement changes of the nut 4 on the bolt 3; furthermore, by setting several telescopic pressure rods 121 and a pressure ring 13 located between the nut 4 and the connector 2 on the loosening detection component 1, when the controller receives the nut 4 loosening signal, it can control the telescopic pressure rods 121 to extend and tighten the connector 2, while the pressure ring 13 evenly distributes the pressure, effectively preventing the connector 2 from loosening further, so that the equipment can continue to work even when the bolt 3 is loose.

[0083] The bolt loosening detection device also provides a sealing protective layer 122 on the loosening detection component 1 between the telescopic pressure rod 121 and the loosening detection sensor 123. One end of the sealing protective layer 122 is fixed to the sealing protective layer 122, and the other end is embedded in the annular groove 133 on the pressure ring 13, forming a sealing barrier. This effectively blocks external dust, moisture and other impurities, protects the internal loosening detection sensor 123 and nut 4, reduces equipment maintenance and replacement costs, and ensures the continuous and reliable operation of the loosening detection component 1.

[0084] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0085] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bolt loosening detection device, characterized in that, The device includes a loosening detection component (1), a bolt (3), a nut (4), and a connector (2). The bolt (3) passes through a through hole provided on the connector (2). The nut (4) is threadedly connected to the end of the bolt (3) extending out of the connector (2). The loosening detection component (1) is threadedly connected to both ends of the bolt (3). The loosening detection component (1) includes: The detection device body (12) is connected to the top cover (11) by threads. A loosening detection sensor (123) is fixedly installed on the side of the detection device body (12) near the bolt (3). The loosening detection sensor (123) is used to detect the position of the nut (4) fixed on the bolt (3). Several telescopic pressure rods (121) are set on the side of the main body (12) of the detection device close to the nut (4). The controller controls the extension and retraction state of the telescopic pressure rods (121) according to the signal sent by the loosening detection sensor (123). The top cover (11) is provided with a connecting post (111) that penetrates the top cover (11). One end of the connecting post (111) is connected to the main body (12) of the detection device, and the other end is connected to the controller via a cable (112).

2. The bolt loosening detection device according to claim 1, characterized in that, The loosening detection component (1) also includes a pressure ring (13), which has a through hole (132) for passing through the bolt (3). The pressure ring (13) is located between the nut (4) and the connector (2). The pressure ring (13) is used to clamp between the telescopic pressure rod (121) and the connector (2) when the telescopic pressure rod (121) is extended.

3. The bolt loosening detection device according to claim 2, characterized in that, The main body (12) of the detection device includes: The main body base (120) is threaded to one end of the top cover (11) near the bolt (3), and the main body base (120) is used to retrieve and store the telescopic pressure rod (121). A sealing protective layer (122) is provided between the loosening detection sensor (123) and the telescopic pressure rod (121). One end of the sealing protective layer (122) is fixedly provided on the side of the main body base (120) near the bolt (3), and the other end is embedded in the annular groove (133) provided on the pressure ring (13). The sealing protective layer (122) is used to cooperate with the pressure ring (13) to seal and protect the loosening detection sensor (123) and the nut (4) located inside.

4. The bolt loosening detection device according to claim 3, characterized in that, The main body base (120) has the following on the side away from the nut (4): A retraction hole (1201) is provided, which penetrates the main body base (120). The shape and number of the retraction hole (1201) are adapted to the telescopic rod (121). The retraction hole (1201) is used to retain the telescopic rod (121) when it is retracted. A central hole (1202) is provided at the projection position of the connecting post (111) on the main body base (120), and the central hole (1202) is used to insert the connecting post (111). A connecting groove (1203) is provided at the connection between the retraction hole (1201) and the center hole (1202), and the connecting groove (1203) is used to connect the retraction hole (1201) and the center hole (1202).

5. The bolt loosening detection device according to claim 3, characterized in that, The pressure ring (13) is also provided with a buffer hole (131) adapted to the telescopic pressure rod (121), and the buffer hole (131) is used to insert the end of the telescopic pressure rod (121).

6. The bolt loosening detection device according to claim 5, characterized in that, The buffer hole (131) is a T-shaped cylindrical hole. A buffer element is fixedly installed in the cylinder with a larger diameter on the side of the buffer hole (131) near the connector (2). The buffer element is used to buffer the instantaneous impact force generated by the extension rod (121) protruding to press the connector (2).

7. The bolt loosening detection device according to claim 3, characterized in that, The main body base (120) has a connecting hole (124) on the side near the nut (4), and the connecting hole (124) is threaded to install the loosening detection component (1) on the bolt (3).

8. A bolt loosening detection device according to claim 2, characterized in that, Both ends of the connector (2) are provided with loosening detection components (1). The loosening detection components (1) on both sides are connected to the same controller through a cable (112) to control the extension and retraction of the telescopic pressure rod (121) to tighten the connector (2) when the loosening detection sensor (123) detects the displacement of the nut (4).

9. A bolt loosening detection device according to claim 1, characterized in that, The loosening detection component (1) is also equipped with a warning light, which is connected to the controller via a wire.

10. A bolt loosening detection device according to claim 1, characterized in that, The outer wall of the loosening detection component (1) is provided with anti-slip texture, which is used to increase hand friction when installing or removing the loosening detection component (1).

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