Connector looseness detection device and method

Abstract

The invention discloses a connector looseness detection device and method, and relates to the technical field of looseness detection, the device comprises three resistance tapes with toughness, the resistance values of the three resistance tapes are changed along with the stretching length, and the three resistance tapes are respectively a first resistance tape, a second resistance tape and a third resistance tape; the first resistance tape is linearly arranged between the joint mother end and the joint son end along the axial direction of the joint; the second resistance tape and the third resistance tape are obliquely and symmetrically arranged between the joint mother end and the joint son end relative to the axial direction of the first resistance tape; the detection assembly also comprises a processing module, and the processing module is configured to obtain the resistance values and resistance variations of the first resistance tape, the second resistance tape and the third resistance tape, and judge the connection state of the joint based on the comparison relationship among the resistance variations of the first resistance tape, the second resistance tape and the third resistance tape. Therefore, environmental interference, transverse movement type loosening and rotation type loosening can be distinguished.

Description

Technical Field

[0001] This invention relates to the field of loosening detection technology, and in particular to a joint loosening detection device and method. Background Technology

[0002] Joints are critical connection points in fluid transport, mechanical assembly, and power transmission systems. Their stability directly affects the safe operation of the entire system. Especially in scenarios such as petrochemicals, power equipment, water supply networks, and high-pressure fluid transmission, joints are prone to loosening due to factors such as vibration, impact, thermal cycling, and material creep, leading to media leakage, connection failure, or even safety accidents. Therefore, the design and development of joint anti-loosening detection devices has become an important research direction in the field of industrial safety monitoring.

[0003] Chinese Patent Application No. 2018101081409 discloses a method for monitoring loosening of pipe thread joints. This method involves attaching piezoelectric ceramic sensors to the surfaces of the threaded pipe and the threaded joint. First, an excitation electrical signal is applied to one of the piezoelectric ceramic sensors. The piezoelectric stress wave signal generated by the sensor propagates through the contact surface between the threaded pipe and the threaded joint in the pipe thread and is then captured by the other piezoelectric ceramic sensor. This invention utilizes piezoelectric ceramic sensor technology to easily and conveniently monitor and identify the sealing status and loosening / leakage of pipe threads, greatly improving the safety of pipe thread connections.

[0004] In hydraulic pipeline joint loosening detection scenarios, existing technologies often employ single sensors or simple threshold alarms. However, their reliability and accuracy are significantly insufficient under complex operating conditions. Firstly, detection methods rely heavily on displacement sensors or strain gauges that directly measure the distance between joints. But in the inherent pressure pulsations, mechanical vibrations, and drastic temperature changes of hydraulic systems, these sensors are susceptible to interference. For example, a simple tension sensor may output false tension signals due to the thermal expansion and contraction of the pipeline, while vibration can cause reading fluctuations, making it impossible for the system to distinguish between genuine loosening and environmental noise, resulting in numerous false alarms or missed alarms.

[0005] Meanwhile, existing detection solutions are limited in function. When different types of loosening occur in the joint, such as lateral slippage and thread rotation, traditional systems can only report "abnormality" but cannot identify the fault mode. They rely on the experience of maintenance personnel for on-site troubleshooting, resulting in weak risk management capabilities. In addition, although there are some monitoring methods based on resistance or optical fibers, their analysis models are usually fixed and the preset logic is simple. They cannot adapt to changes in the characteristics of the joint caused by material fatigue, wear, etc. during long-term operation. Because the system lacks the ability to deeply reason about the correlation of changes in multiple parameters, the diagnostic conclusions are delayed or inaccurate, making it difficult to meet the real-time and accurate requirements of safety early warning in industrial sites.

[0006] Based on the above pain points, how to effectively overcome environmental interference and achieve accurate identification of different loosening modes has become a bottleneck in the development of high-reliability hydraulic pipeline joint loosening detection technology.

[0007] Therefore, it is necessary to invent a joint loosening detection device and method to solve the above problems. Summary of the Invention

[0008] The purpose of this invention is to provide a joint loosening detection device and method to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a joint loosening detection device, comprising a female end of the joint, a male end of the joint, and a detection component and a protection component therebetween. The detection component includes three tough resistance strips whose resistance values ​​vary with the tensile length, namely a first resistance strip, a second resistance strip, and a third resistance strip. The first resistance band is arranged in a straight line along the axial direction of the connector between the female end and the male end of the connector, and the second and third resistance bands are arranged in a symmetrical manner relative to the axial direction of the first resistance band between the female end and the male end of the connector. The detection component further includes a processing module, which is configured to: acquire the resistance values ​​and resistance changes of the first resistance band, the second resistance band, and the third resistance band, and determine the connection status of the connector based on the comparison relationship between the resistance changes of the first resistance band, the second resistance band, and the third resistance band, so as to distinguish between environmental interference, lateral loosening, and rotational loosening.

[0010] Preferably, the detection component further includes a connector disposed at the end of the connector, and one end of each of the three resistance bands and the processing module are integrated into the connector; The processing module's judgment logic is as follows: the connector status is determined based on whether the resistance changes of the three resistance bands are coordinated, the differential changes between the first resistance band and the other two resistance bands, and whether the changes of the second resistance band and the third resistance band are in the same or opposite directions.

[0011] Preferably, if the processing module detects that the resistance changes of the three resistance bands are the same within a preset error range, it determines that it is environmental interference; If the resistance change of the first resistor band is different from the resistance change of the second and third resistor bands, and the resistance change of the second and third resistor bands is the same within a preset error range, then it is determined that the connector has become loose due to lateral movement. If the resistance change of the first resistance band is different from the resistance change of the second and third resistance bands, and the resistance change of the second and third resistance bands has opposite signs, then the connector is determined to be loosened by rotation.

[0012] Preferably, after determining that there is environmental interference and the situation remains stable, the processing module starts a zero-calibration procedure, updates the resistance reference value based on the resistance value of each resistance band at this time, applies standard test strain to the resistance band periodically, compares the detected resistance change with the expected change, and if the deviation exceeds the allowable range, generates a calibration coefficient to correct subsequent detection values.

[0013] Preferably, the detection assembly further includes a fixing member disposed on the female end of the connector, and the other ends of the first resistance strip, the second resistance strip and the third resistance strip are respectively connected to the female end of the connector through different fixing members.

[0014] Preferably, the protection component can limit the detection component to ensure that the detection component is effectively connected to the female end and the male end of the connector, which facilitates the zeroing operation of the detection component during installation and prevents the detection component from slipping during the detection process. The protection component includes a first locking member sleeved on the outside of the female end of the connector. The first locking member has a snap-fit ​​member on the side near the first resistor band. The snap-fit ​​member can limit one end of the female end of the connector.

[0015] Preferably, the end of the first locking member away from the snap-fit ​​member is slidably connected to a sliding member, and the end of the sliding member that contacts the end face of the connector female is provided with a limiting baffle for limiting the other end of the connector female. The sliding member has multiple mating holes in a linear array, and the first locking member is provided with a locking pin. The first locking member, the sliding member, and the snap-fit ​​member can be fixed to the connector female by the locking pin.

[0016] Preferably, the protective component further includes a second locking member sleeved on the end of the connector, and a telescopic member connecting the first locking member and the second locking member. The second locking member is provided with a slot adapted to the connector, and the connector is fixedly installed in the slot of the second locking member. The structure of the second locking member is the same as that of the first locking member.

[0017] This invention also provides a method for detecting joint loosening, which utilizes the aforementioned joint loosening detection device to detect joint loosening, and includes the following steps: S100. The resistance values ​​corresponding to the connection status of the connector are obtained in real time through the first resistance band, the second resistance band and the third resistance band of the detection component. S200. Based on the obtained resistance values, calculate the resistance change of each resistance band relative to a reference state. S300. Analyze the comparison relationship between the resistance changes of the first resistance band, the second resistance band, and the third resistance band; S400. Based on the comparison relationship, determine that the current state of the joint is one of normal tightness, environmental interference, lateral loosening, or rotational loosening.

[0018] Preferably, step S400 specifically includes the following steps: If the resistance changes of the first resistance band, the second resistance band, and the third resistance band are the same within a preset error range, then it is determined to be environmental interference. If the resistance change of the first resistance band is different from the resistance change of the second and third resistance bands, and the resistance change of the second and third resistance bands is the same within the error range, then it is determined that the connector has become loose due to lateral movement. If the resistance change of the first resistance band is different from the resistance change of the second and third resistance bands, and the resistance change of the second and third resistance bands has opposite signs, then the connector is determined to be loosened by rotation.

[0019] The technical effects and advantages of this invention are as follows: This invention uses three flexible resistance bands distributed in a specific geometric configuration to monitor the resistance change in real time. Based on the coordination, differential and directional comparison of multi-channel signals, the processing module intelligently distinguishes between environmental interference, lateral loosening and rotational loosening. It can not only effectively eliminate interference through an adaptive zeroing calibration procedure, but also accurately identify and warn of different types of structural loosening, thereby significantly improving the accuracy, real-time performance and reliability of joint loosening detection under complex working conditions such as vibration, temperature difference and pressure pulsation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the detection component structure of the present invention.

[0022] Figure 3 This is a schematic diagram of the three resistance band distributions of the present invention.

[0023] Figure 4 This is a schematic diagram of the connection structure of the protection component of the present invention.

[0024] Figure 5 This is a schematic diagram showing the overall structure of the present invention broken down.

[0025] Figure 6 This is a half-sectional schematic diagram of the female end of the connector of the present invention.

[0026] Figure 7 For the present invention Figure 6 Schematic diagram of the mechanism at point A.

[0027] Figure 8 This is a flowchart of the detection method of the present invention.

[0028] Figure 9 This is a schematic diagram of the detection logic of the present invention.

[0029] In the diagram: 1. Female connector; 2. Male connector; 3. Detection component; 31. First resistance band; 32. Second resistance band; 33. Third resistance band; 34. Connector; 35. Fixing component; 4. Protection component; 41. First locking component; 42. Snap-fit ​​component; 43. Sliding component; 44. Connecting hole; 45. Locking pin; 46. Second locking component; 47. Telescopic component. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0031] To overcome the problems in existing technologies, traditional detection equipment sensors are susceptible to interference from pressure pulsation, vibration, and temperature differences under complex working conditions, leading to false alarms and missed alarms. Furthermore, they cannot distinguish the type of loosening, rely on manual inspection, and have fixed analysis models that are difficult to adapt to changes in joints during long-term operation, resulting in delayed diagnosis and failure to meet the requirements for real-time and accurate early warning.

[0032] like Figure 1 - Figure 9 As shown, in the first embodiment of the present invention, a joint loosening detection device is provided, which includes a female end 1, a male end 2, and a detection component 3 between them.

[0033] It should be noted that the inner side of the female end 1 of the connector is provided with a threaded groove, and the end of the male end 2 of the connector is provided with a thread that matches the threaded groove on the inner side of the female end 1. The female end 1 and the male end 2 of the connector are fixedly connected by a threaded connection to ensure that the medium flowing in the female end 1 and the male end 2 of the connector will not leak.

[0034] In this embodiment, the detection component 3 includes three tough resistance bands whose resistance values ​​vary with the stretch length, namely the first resistance band 31, the second resistance band 32, and the third resistance band 33.

[0035] It should be noted that the first resistance band 31, the second resistance band 32, and the third resistance band 33 have the same composition and structure, all of which are composed of graphene resistive material.

[0036] like Figure 1-3 As shown, in this embodiment, the first resistance band 31 is arranged in a straight line along the axial direction of the connector between the female end 1 and the male end 2 of the connector, and the second resistance band 32 and the third resistance band 33 are arranged in a symmetrical manner relative to the axial direction of the first resistance band 31 between the female end 1 and the male end 2 of the connector.

[0037] In this embodiment, the detection component 3 further includes a connector 34 disposed on the connector end 2. One end of each of the three resistance bands and the processing module are integrated into the connector 34. The detection component 3 also includes a fixing member 35 disposed on the connector end 1. The other ends of the first resistance band 31, the second resistance band 32 and the third resistance band 33 are respectively connected to the connector end 1 through different fixing members 35.

[0038] It should be noted that the connector 34 is provided with signal transmission wires corresponding to the first resistance band 31, the second resistance band 32 and the third resistance band 33 respectively, in order to transmit the resistance change information of the three resistance bands to the processing module.

[0039] In this embodiment, the detection component 3 further includes a processing module, which is configured to: acquire the resistance values ​​and resistance changes of the first resistance band 31, the second resistance band 32 and the third resistance band 33, and determine the connection status of the connector based on the comparison relationship between the resistance changes of the first resistance band 31, the second resistance band 32 and the third resistance band 33, so as to distinguish between environmental interference, lateral loosening and rotational loosening.

[0040] In this embodiment, the processing module's judgment logic is as follows: the connector status is determined based on whether the resistance changes of the three resistance bands are coordinated, the differential changes between the first resistance band 31 and the other two resistance bands, and whether the changes of the second resistance band 32 and the third resistance band 33 are in the same or opposite directions.

[0041] In this embodiment, if the processing module detects that the resistance changes of the three resistance bands are the same within a preset error range, it is determined to be environmental interference.

[0042] If the resistance change of the first resistance band 31 is different from the resistance change of the second resistance band 32 and the third resistance band 33, and the resistance change of the second resistance band 32 and the third resistance band 33 is the same within the preset error range, then it is determined that the connector has become loose due to lateral movement.

[0043] If the resistance change of the first resistance band 31 is different from the resistance change of the second resistance band 32 and the third resistance band 33, and the resistance change of the second resistance band 32 and the third resistance band 33 have opposite signs, then it is determined that the joint has become loose by rotation.

[0044] In this embodiment, after the processing module determines that there is environmental interference and the situation remains stable, it starts the zero calibration procedure and updates the resistance reference value based on the resistance value of each resistance band at this time. Standard test strain is applied to the resistance band periodically, and the detected resistance change is compared with the expected change. If the deviation exceeds the allowable range, a calibration coefficient is generated to correct the subsequent detection value.

[0045] When lateral loosening occurs between the female end 1 and the male end 2 of the connector during use, i.e., the threaded groove in the female end 1 fails after prolonged operation or the thread on the male end 2 fails after prolonged operation, the male end 2 will slide away from the female end 1 under hydraulic pressure. In this state, since the first resistance band 31 is straight along the axial direction of the connector between the female end 1 and the male end 2, while the second resistance band 32 and the third resistance band 33 are symmetrically arranged between the female end 1 and the male end 2 with an inclination relative to the axial direction of the first resistance band 31, the tensile force on the first resistance band 31 under the movement of the male end 2 is different from that on the second resistance band 32 and the third resistance band 33. Since the second resistance band 32 and the third resistance band 33 are symmetrically arranged at both ends of the first resistance band 31, the tensile forces on the second resistance band 32 and the third resistance band 33 are approximately the same. Therefore, this type of loosening can be identified by the resistance change of the three resistance bands.

[0046] When a rotational loosening occurs between the female end 1 and the male end 2 of the connector, that is, when the fluid pressure inside the female end 1 and the male end 2 of the connector exceeds the force of the threads between the female end 1 and the male end 2 of the connector, the male end 2 of the connector will rotate inside the female end 1 under the action of pressure. For ease of explanation, the loosening is defined as the counterclockwise rotation of the male end 2 of the connector. The second resistance band 32 is located to the left of the first resistance band 31. When the male end 2 of the connector rotates counterclockwise, that is, it rotates from the first resistance band 31 toward the direction closer to the second resistance band 32, for explanation purposes.

[0047] When connector end 2 is loosened and rotated counterclockwise under pressure, the rotational force of the three resistor bands varies. Since the positions and installation angles of the three resistor bands are different, the tensile forces on them are also different. As connector end 2 rotates towards the second resistor band 32, the second resistor band 32 will either contract or remain unchanged, depending on the rotation angle of connector end 2. The first resistor band 31 will be stretched, but to a lesser extent than the third resistor band 33. Therefore, the stretching degree of the three resistor bands is: first resistor band 31 > second resistor band 32 > third resistor band 33. Furthermore, the second resistor band 32 is in a stretched state while the third resistor band 33 is in a contracted state. Since the resistance of a resistor band is related to its length in the current direction and its cross-sectional area perpendicular to the current direction, this type of loosening can be identified by monitoring the resistance changes of the three resistor bands.

[0048] When the ambient temperature and humidity of the female end 1 and the male end 2 of the connector change, the three resistance bands are affected in the same way. Therefore, the resistance change rate of the three resistance bands is the same. By monitoring the resistance change of the three resistance bands, this interference can be identified.

[0049] It is worth noting that this device monitors the resistance changes in real time through three flexible resistance bands distributed in a specific geometric configuration. Based on the coordination, differential, and directional comparison of multi-channel signals, the processing module intelligently distinguishes between environmental interference, lateral loosening, and rotational loosening. It can not only effectively eliminate interference through an adaptive zeroing calibration procedure, but also accurately identify and warn of different types of structural loosening, thereby significantly improving the accuracy, real-time performance, and reliability of joint loosening detection under complex working conditions such as vibration, temperature difference, and pressure pulsation.

[0050] However, in practical applications, operators have found that although the device can distinguish between environmental interference, lateral loosening, and rotational loosening, and can effectively eliminate interference through the adaptive zeroing calibration procedure, it is difficult to ensure that the three resistor strips are installed in place during the initial calibration after installation. This results in the initial data containing errors, which makes it easy for subsequent test results to deviate from the actual results. Furthermore, if the connector 34 or the fixing part 35 connecting the three resistor strips becomes loose and detaches from the connection of the female end 1 or the male end 2 of the connector, the device will fail directly.

[0051] Therefore, in another embodiment of the present invention, the device further includes a protection component 4, which can limit the detection component 3 so that the detection component 3 is effectively connected to the female end 1 and the male end 2 of the connector, so that the detection component 3 can be zeroed during installation, and at the same time prevent the detection component 3 from slipping during the detection process.

[0052] In this embodiment, the protection component 4 includes a first locking member 41 sleeved on the outside of the female connector 1. The first locking member 41 has a snap-fit ​​member 42 on the side near the first resistor strip 31. The snap-fit ​​member 42 can limit one end of the female connector 1. The end of the first locking member 41 away from the snap-fit ​​member 42 is slidably connected to a sliding member 43. The end of the sliding member 43 that contacts the end face of the female connector 1 is provided with a limiting baffle for limiting the other end of the female connector 1. The sliding member 43 has a plurality of mating holes 44 in a linear array. The first locking member 41 is provided with a locking pin 45. The first locking member 41, the sliding member 43, and the snap-fit ​​member 42 can be fixed on the female connector 1 by the locking pin 45.

[0053] In this embodiment, the protective component 4 further includes a second locking member 46 sleeved on the connector end 2, and a telescopic member 47 connecting the first locking member 41 and the second locking member 46. The second locking member 46 is provided with a slot adapted to the connector 34. The connector 34 is fixedly installed in the slot of the second locking member 46. The structure of the second locking member 46 is the same as that of the first locking member 41.

[0054] It should be noted that the first locking member 41 and the snap-fit ​​member 42 limit one end of the connector female end 1, and the sliding member 43 limits the other end of the connector female end 1. At the same time, the locking pin 45 locks the sliding member 43 and the first locking member 41, so that the protective component 4 located on the connector female end 1 can be adaptively adjusted according to the size of the connector female end 1 and fixed on the connector female end 1, thereby ensuring that the protective component 4 can always be fixedly connected to the connector female end 1. At the same time, the locking pin 45 limits the fixing member 35 to ensure that the fixing member 35 is always fixedly connected to the connector female end 1.

[0055] Once the fixing member 35 on the female connector 1 is fixed, the second locking member 46 is pulled to move, thereby causing the telescopic member 47 to extend and retract. At the same time, the processing module monitors the resistance changes of the three resistance bands in real time. When the resistance of the three resistance bands reaches their corresponding preset values, the locking pin 45 on the second locking member 46 is controlled to fix the second locking member 46 to the female connector 2, thus completing the initial installation. This ensures that the three resistance bands are installed in place, preventing the initial data from containing errors, which could lead to subsequent test results deviating from the actual results. It also prevents the connector 34 or fixing member 35 connecting the three resistance bands from becoming loose and detaching from the female connector 1 or the female connector 2, which would cause the device to fail directly.

[0056] In another embodiment of the present invention, a method for detecting joint loosening is also provided, which utilizes the above-mentioned joint loosening detection device to detect joint loosening. The method includes the following steps: S100: The resistance values ​​corresponding to the connector connection status are obtained in real time by the first resistance band 31, the second resistance band 32 and the third resistance band 33 of the detection component 3.

[0057] S200. Based on the obtained resistance values, calculate the resistance change of each resistance band relative to a reference state.

[0058] S300. Analyze the comparison relationship between the resistance changes of the first resistance band 31, the second resistance band 32, and the third resistance band 33.

[0059] S400. Based on the comparison relationship, determine the current state of the joint as one of normal tightness, environmental interference, lateral loosening, or rotational loosening.

[0060] It should be noted that the S400 specifically includes the following steps: If the resistance changes of the first resistance band 31, the second resistance band 32, and the third resistance band 33 are the same within the preset error range, it is determined to be environmental interference.

[0061] If the resistance change of the first resistance band 31 is different from the resistance change of the second resistance band 32 and the third resistance band 33, and the resistance change of the second resistance band 32 and the third resistance band 33 are the same within the error range, then it is determined that the joint has become loose due to lateral movement.

[0062] If the resistance change of the first resistance band 31 is different from the resistance change of the second resistance band 32 and the third resistance band 33, and the resistance change of the second resistance band 32 and the third resistance band 33 have opposite signs, then it is determined that the joint has become loose by rotation.

[0063] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A joint loosening detection device, comprising a female end of the joint, a male end of the joint, and a detection component and a protection component therebetween, characterized in that, The detection component includes three tough resistance bands whose resistance values ​​vary with the stretch length, namely the first resistance band, the second resistance band, and the third resistance band; The first resistance band is arranged in a straight line along the axial direction of the connector between the female end and the male end of the connector, and the second and third resistance bands are arranged in a symmetrical manner relative to the axial direction of the first resistance band between the female end and the male end of the connector. The detection component further includes a processing module, which is configured to: acquire the resistance values ​​and resistance changes of the first resistance band, the second resistance band, and the third resistance band, and determine the connection status of the connector based on the comparison relationship between the resistance changes of the first resistance band, the second resistance band, and the third resistance band, so as to distinguish between environmental interference, lateral loosening, and rotational loosening.

2. The joint loosening detection device according to claim 1, characterized in that, The detection component also includes a connector disposed at the end of the connector, and one end of each of the three resistance bands and the processing module are integrated into the connector. The processing module's judgment logic is as follows: the connector status is determined based on whether the resistance changes of the three resistance bands are coordinated, the differential changes between the first resistance band and the other two resistance bands, and whether the changes of the second resistance band and the third resistance band are in the same or opposite directions.

3. The joint loosening detection device according to claim 1, characterized in that, If the processing module detects that the resistance changes of the three resistance bands are the same within a preset error range, it determines that it is environmental interference. If the resistance change of the first resistor band is different from the resistance change of the second and third resistor bands, and the resistance change of the second and third resistor bands is the same within a preset error range, then it is determined that the connector has become loose due to lateral movement. If the resistance change of the first resistance band is different from the resistance change of the second and third resistance bands, and the resistance change of the second and third resistance bands has opposite signs, then the connector is determined to be loosened by rotation.

4. The joint loosening detection device according to claim 1, characterized in that, After determining that there is environmental interference and the situation remains stable, the processing module starts a zero-calibration procedure, updating the resistance reference value based on the resistance value of each resistance band at this time; standard test strain is applied to the resistance band periodically, and the detected resistance change is compared with the expected change. If the deviation exceeds the allowable range, a calibration coefficient is generated to correct subsequent detection values.

5. The joint loosening detection device according to claim 1, characterized in that, The detection component also includes a fixing member disposed at the female end of the connector, and the other ends of the first resistance strip, the second resistance strip and the third resistance strip are respectively connected to the female end of the connector through different fixing members.

6. The joint loosening detection device according to claim 1, characterized in that, The protection component can limit the detection component to ensure that the detection component is effectively connected to the female end and the male end of the connector, which facilitates the zeroing operation of the detection component during installation and prevents the detection component from slipping during the detection process. The protection component includes a first locking member sleeved on the outside of the female end of the connector. The first locking member has a snap-fit ​​member on the side near the first resistor strip. The snap-fit ​​member can limit one end of the female end of the connector.

7. The joint loosening detection device according to claim 6, characterized in that, The first locking member has a sliding member slidably connected to the end away from the snap-fit ​​member. The end of the sliding member that contacts the end face of the female connector is provided with a limiting baffle for limiting the other end of the female connector. The sliding member has multiple mating holes in a linear array. The first locking member is provided with a locking pin. The first locking member, the sliding member, and the snap-fit ​​member can be fixed to the female connector by the locking pin.

8. The joint loosening detection device according to claim 1, characterized in that, The protective assembly further includes a second locking member sleeved on the end of the connector, and a telescopic member connecting the first locking member and the second locking member. The second locking member has a slot adapted to the connector, and the connector is fixedly installed in the slot of the second locking member. The structure of the second locking member is the same as that of the first locking member.

9. A method for detecting joint looseness, comprising using the joint looseness detection device according to any one of claims 1-8 to detect joint looseness, characterized in that, Includes the following steps: S100. The resistance values ​​corresponding to the connection status of the connector are obtained in real time through the first resistance band, the second resistance band and the third resistance band of the detection component. S200. Based on the obtained resistance values, calculate the resistance change of each resistance band relative to a reference state. S300. Analyze the comparison relationship between the resistance changes of the first resistance band, the second resistance band, and the third resistance band; S400. Based on the comparison relationship, determine that the current state of the joint is one of normal tightness, environmental interference, lateral loosening, or rotational loosening.

10. The method for detecting joint loosening according to claim 9, characterized in that, The S400 specifically includes the following steps: If the resistance changes of the first resistance band, the second resistance band, and the third resistance band are the same within a preset error range, then it is determined to be environmental interference. If the resistance change of the first resistance band is different from the resistance change of the second and third resistance bands, and the resistance change of the second and third resistance bands is the same within the error range, then it is determined that the connector has become loose due to lateral movement. If the resistance change of the first resistance band is different from the resistance change of the second and third resistance bands, and the resistance change of the second and third resistance bands has opposite signs, then the connector is determined to be loosened by rotation.

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