Magnetically adhesive sensor for bolt tension detection and tension detection system

Abstract

A magnetically adhering bolt tension sensing sensor, characterized in that the bolt tension sensing sensor is mountable on one end of a bolt, the bolt being screwed with a nut, the structure of the bolt tension sensing sensor comprising a sensor body and a thrust assembly; wherein the sensor body comprises a sensing part and a sensor head; wherein the sensing part is mounted on the bolt and is slidably connected to the bolt; wherein the sensor head is attached to the end of the bolt; wherein the thrust assembly is connected to the detecting part and usable to move the detecting part along the axial direction of the bolt until the detecting part fits onto the nut, so that the detecting part can detect the tension at the connection between the bolt and the nut.

Description

TECHNICAL FIELD

[0001] The present utility model relates to the technical field of bolt tension detection, in particular to a magnetically adhering sensor for bolt tension detection and a tension detection system. STATE OF THE ART

[0002] Ultrasonic stress monitoring enables non-destructive online monitoring of critical bolts and other rod-like structures in a facility, enabling real-time detection of the equipment's stress status and real-time warning of faults such as abnormal stress reduction (e.g., early warning of looseness and fatigue fractures). Currently, ultrasonic non-destructive bolt force measurement technology is generally used, which is based on the principle of acoustic elasticity of metals. Magnetic fixation is used to monitor the bolts to be monitored on the equipment in use. A magnet is embedded in a conventional magnetically adhesive sensor housing, which attracts one end of the bolt.However, due to the relatively long remaining extension of the bolt of the power plant's wake water flap or volute casing flap, the magnet embedded in the magnetically adhering sensor housing cannot be attracted to the nut during the on-site assembly process, making accurate monitoring impossible. CONTENTS OF THE PRESENT UTILITY MODEL

[0003] In view of the above-mentioned problems, the present utility model proposes to provide a magnetically adhering sensor for bolt tension detection and a tension detection system which overcome or at least partially solve the above-mentioned problems.

[0004] To solve the above problems, the utility model discloses, in a first aspect, a magnetically adhering bolt tension detecting sensor mounted on one end of a bolt, the bolt being screwed with a nut, the structure of the magnetically adhering bolt tension detecting sensor comprising a sensor body and a thrust assembly; wherein the sensor body comprises a sensing part and a sensor head; wherein the sensing part is mounted on the bolt and is slidably connected to the bolt; wherein the sensor head is attached to the end of the bolt; wherein the thrust assembly is connected to the detecting part and usable to move the detecting part along the axial direction of the bolt until the detecting part fits onto the nut, so that the detecting part can detect the tension at the connection between the bolt and the nut.

[0005] Optionally, the detection part comprises a ring magnet, wherein the inner ring of the ring magnet is placed on the bolt and slidably connected to the bolt.

[0006] Optionally, the thrust assembly includes a thrust column group connected to and projecting from the sensing part.

[0007] Optionally, the thrust column group comprises several thrust columns, with the thrust columns evenly distributed along the circumferential direction.

[0008] Optionally, the number of push columns is an even number.

[0009] Optionally, the push column is a light column that is fixedly connected to the detection part, whereby by pushing the light column the detection part is driven to move along the axial direction of the bolt.

[0010] Optionally, the thrust column has an external gear thread, wherein the detection part has an internal gear thread that matches the external gear thread, wherein the external gear thread is coupled to the internal thread; wherein by rotating the thrust column, the detection part is movable or is moved in the axial direction of the bolt.

[0011] Optionally, the bolt and nut are connected to a follow-up water valve.

[0012] Optionally, the bolt and nut are connected to a spiral casing flap.

[0013] In a second aspect, the utility model discloses a tension detection system comprising a magnetically adhering sensor for bolt tension detection as described above.

[0014] Optionally, the tension detection system can be used to detect the bolt tension of a / the spiral casing flap.

[0015] Optionally, the tension detection system can be used to detect the bolt tension of a follow-up water flap.

[0016] Optionally, the voltage detection system further comprises a signal conditioning device, a data acquisition and processing unit, a power supply module, a display and alarm device, and a communication module; wherein the signal conditioning device, the data acquisition and processing unit, the power supply module, the display and alarm device, and the communication module are each electrically connected to the magnetically adhering sensor for bolt voltage detection.

[0017] The present utility model has the following advantages: The embodiments of the present utility model are mounted on the end of a bolt, the bolt being screwed to a nut and consisting of a sensor body and a thrust assembly; the sensor body comprising a sensing part and a sensor head; the sensing part being placed on the bolt and slidably connected to the bolt; the sensor head being fixed to the end of the bolt; the thrust assembly being connected to the sensing part and being usable to move the sensing part along the axial direction of the bolt until the sensing part fits onto the nut, so that the sensing part can sense the stress at the junction between the bolt and the nut.After the sensor head of the sensor body is fixed to the end of the bolt, the thrust assembly can be used to press the sensing part to the nut for engagement and thus achieve axial adhesion, whereby the stress at the connection between the bolt and the nut can be detected, so that the stress state can be accurately monitored and the early warning information can be issued in a timely manner. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic structural diagram of a magnetically adhering bolt tension detecting sensor of the present utility model; Fig. 2 is an exploded structural view of a magnetically adhering bolt tension detecting sensor of the present utility model; Fig. 3 is a schematic diagram of an application provision of a magnetically adhering sensor for bolt tension detection of the present utility model. Explanation of reference symbols:

[0018] 1-Bolt, 2-Nut, 3-Water trap, 4-Magnetic bolt tension sensor; 100-Sensor body, 110-Detecting part, 120-Sensor head; 200-Thrust assembly, 210-Thrust column. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned purposes, features and advantages of the present utility model clearer and easier to understand, the present utility model is described in more detail below together with the attached drawings and specific implementation methods.

[0020] Ultrasonic stress monitoring can be used to non-destructively monitor important bolts and other rod-like structures in a facility online, detecting the stress status of the equipment in real time and providing real-time warnings of faults such as abnormal stress reduction (e.g., early warning of looseness and fatigue fractures), thereby improving equipment safety and reliability. Ultrasonic non-destructive bolt force measurement technology is generally used, which is based on the principle of acoustic elasticity of metals. Magnetic fixation is used to monitor the bolts to be monitored on the equipment in use, eliminating the need to replace the bolt to be monitored on the equipment in use. At the same time, the sensor is easy to disassemble and assemble.After installation, various bolts can be easily replaced for monitoring. It is easy to install and maintain, has high accuracy, and the accuracy of online bolt tension monitoring can be easily improved in the future if necessary. A conventional magnetically adhering sensor housing has a magnet embedded in it, which tightens one end of the bolt. During on-site assembly, the remaining extension of the bolt of the wake water flap or volute casing flap of some power plants is relatively long, resulting in the magnet embedded in the magnetically adhering sensor housing being unable to be attracted to the nut. To solve the above-mentioned problems, embodiments of the present utility model are proposed.

[0021] With reference to Fig. 1 is a schematic structural diagram of a magnetically adhering bolt tension detecting sensor of the present utility model, with reference to Fig. 2 is a schematic structural exploded view of a magnetically adhering bolt tension sensing sensor of the present invention, wherein the magnetic bolt tension sensing sensor 4 is mounted on the end of the bolt 1, the bolt 1 being screwed to the nut 2, wherein the magnetic bolt tension sensing sensor 4 may specifically include components such as a sensor body 100 and a thrust assembly 200; The sensor body 100 comprises a sensing part 110 and a sensor head 120; the sensing part 110 is mounted on the bolt 1 and slidably connected to the bolt 1; the sensing head 120 is attached to the end of the bolt 1; the thrust assembly 200 is connected to the detection part 110 and is usable to move the detection part 110 along the axial direction of the bolt 1 until it fits onto the nut 2, so that the detection part 110 detects the tension at the connection between the bolt 1 and the nut 2.

[0022] The bolt 1 penetrates the through hole of the component to be fastened and is screwed to the nut 2. The component to be fastened is fixed by the screw connection of the bolt 1 and the nut 2. The magnetic sensor for bolt tension detection 4 comprises a sensor body 100 and a thrust assembly 200. The sensor body 100 is a tension monitoring part and can be used to monitor the tension between the nut 2 and the bolt 1. The sensor body 100 comprises a sensing part 110 and a sensor head 120. The sensing part 110 is used for tension detection. The sensor head 120 serves to transmit the tension value detected by the sensing part 110 to a corresponding system. The sensing part 110 can be placed on the bolt 1 and can be slidably connected to the bolt 1 and can move on the bolt 1 along the axial direction of the bolt 1.The sensor head 120 is attached to the end of the bolt 1, and the sensor body 100 can then be mounted into the bolt 1. The pusher assembly 200 can push the sensing part 110 to move it along the axial direction of the bolt 1. The pusher assembly 200 is connected to the sensing part 110 and can be operated directly by a personnel, or the personnel can operate the pusher assembly 200 using equipment. The pusher assembly 200 is actuated to move the sensing part 110 along the axial direction of the bolt 1 until it abuts the nut 2. Therefore, the sensing part 110 can adhere to the nut 2 to detect the stress at the connection between the bolt 1 and the nut 2.

[0023] In the embodiments of the present utility model, the mounting is carried out at the end of the bolt 1, wherein the bolt 1 is screwed to a nut 2, and the magnetic sensor for bolt tension detection consists of a sensor body 100 and a push assembly 200; the sensor body 100 comprises a sensing part 110 and a sensing head 120; the sensing part 110 is placed on the bolt 1 and slidably connected to the bolt 1; the sensing head 120 is fixed to the end of the bolt 1; the push assembly 200 is connected to the sensing part 110 and is usable to move the sensing part 110 along the axial direction of the bolt 1 until it fits onto the nut 2, so that the sensing part 110 detects the tension at the connection between the bolt 1 and the nut 2.After the sensor head 120 of the sensor body 100 is attached to the end of the bolt 1, the push assembly 200 is usable to push the detecting part 110 to abut against the nut 2 and thus achieve axial adhesion, whereby the stress at the connection between the bolt 1 and the nut 2 can be detected, so that the stress situation can be accurately monitored and the early warning information can be issued in a timely manner.

[0024] In one embodiment of the present utility model, it is provided that the detection part 110 comprises an annular magnet, wherein the inner ring of the annular magnet is placed on the bolt 1 and slidably connected to the bolt 1.

[0025] The sensing part 110 includes a ring-shaped magnet. Using a ring magnet based on the magnetoelastic effect and the change in the magnetic field path property, the stress state is indirectly reflected by measuring the change in the magnetization property of the bolt 1 (e.g., magnetic permeability and magnetic resistance). The inner ring of the ring magnet is placed on the bolt 1 and slidably connected to the bolt 1, and the stress is determined based on the detected magnetization property after the ring magnet is bonded to the nut 2. That is, the magnetization property of the bolt 1 changes under the action of stress. When the bolt 1 is subjected to tensile or shear stress, the magnetic permeability of the material changes accordingly. The tensile stress improves the magnetizability of the bolt 1 and increases the magnetic permeability.The shear stress makes it difficult to magnetize bolt 1 and reduces its magnetic permeability. A change in the magnetic permeability of bolt 1 leads to a change in its magnetic resistance. The magnetic resistance is inversely proportional to the magnetic permeability. A change in the magnetic resistance leads to changes in the magnetic flux density, which in turn affects the magnetically induced electromotive force. The stress is determined based on the magnetically induced electromotive force.

[0026] In one embodiment of the present utility model, it is provided that the thrust assembly 200 comprises a thrust column group.

[0027] The push column group is connected to the detection part 110 and protrudes from the detection part 110.

[0028] The pusher assembly 200 includes a pusher column group connected to and protruding from the engagement part 110 so that personnel can operate the pusher assembly to move the engagement part 110 so that the engagement part 110 abuts the nut 2.

[0029] In one embodiment of the present utility model, it is provided that the thrust column group comprises a plurality of thrust columns 210, wherein the thrust columns 210 are evenly distributed along the circumferential direction.

[0030] In one embodiment of the present utility model, it is provided that the thrust column group may include a plurality of thrust columns 210, and the plurality of thrust columns 210 may be evenly distributed along the circumferential direction of the detection part 110, that is, the thrust columns 210 are arranged at equal intervals in the circumferential direction of the detection part 110, whereby the detection part 110 is evenly stressed when the detection part 110 is pressed by the thrust assembly 200, whereby the lower plane can move evenly toward the nut 2, so that the detection part 110 better abuts the nut 2.

[0031] In a further development, the number of thrust columns 210 is provided to be an even number. An even number of pairs of thrust columns 210 can press the detection part 110 symmetrically in the partial circumferential direction, causing it to move axially along the bolt 1, thereby preventing the detection part 110 from tilting when it abuts the nut 2, thus performing accurate stress detection.

[0032] In one embodiment of the present utility model, it is provided that the pushing column 210 is a light column, wherein the light column is fixedly connected to the detection part 110 and the detection part 110 is driven by pushing the light column so that the detection part moves along the axial direction of the bolt 1.

[0033] In one embodiment of the present utility model, the thrust column 210 is a light column, that is, the thrust column 210 is a column with a smooth outer surface, and the light column is firmly connected to the detection part 110. The light column and the detection part 110 can be formed integrally. These thrust columns 210 can be pressed by pressing, so that the thrust columns 210 and the detection part 110 are integrated and move along the axial direction of the bolt 1 in the direction near the nut 2, as shown in Fig. 1 until they come into contact with and adhere to the nut 2, and then the nut 2 is added to the rear end of the push column 210 to limit the position. Therefore, the detection part 110 can be moved by a pushing action by pressing, so that the detection part 110 abuts the nut 2.

[0034] In one embodiment of the present utility model, it is provided that the thrust column 210 has an external gear thread, wherein the detection part 110 has an internal gear thread that matches the external gear thread, wherein the external gear thread is coupled to the internal thread; wherein by rotating the thrust column 210, the detection part 110 is moved in the axial direction of the bolt 1.

[0035] In one embodiment of the present utility model, the outer surface of the thrust column 210 has a gear thread, and the interior of the detection part 110 has a gear thread. The gear thread mates with the gear thread. The gear thread of the thrust column 210 and the gear thread of the detection part 110 are coupled to each other. Parameters such as the thread form, the screw pitch, and the like can be determined according to actual conditions and are not specifically limited in the embodiments of the present utility model. By rotating the thrust column 210, the detection part 110 can be moved in the axial direction of the bolt 1. That is, the gear thread on the surface of the column engages with the gear thread of the detection part 110.The pusher column 210 is rotated to push the pusher column 210 and the detection part 110 downward together until the detection part 110 contacts the nut 2 and adheres. Therefore, the detection part 110 can be moved by a rotational operation so that the detection part 110 abuts the nut 2.

[0036] In one embodiment of the present utility model, it is provided that the bolt 1 and the nut 2 are connected to the follow-up water flap 3.

[0037] Referring to Fig.3, the bolt 1 and the nut 2 are connected to the backwater flap 3 to firmly install the backwater flap 3 and detect the stress state on the backwater flap 3. The backwater flap 3 is the backwater flap 3 in a hydropower plant, where the backwater flap 3 is used to adjust the water level, control the water flow, protect the downstream ecological environment, and ensure the safe operation of the hydropower plant. The backwater flap 3 can be a quick backwater shut-off flap, which is used to quickly cut off the water flow in emergency situations and prevent accidents such as overflow of the facility. The backwater emergency flap slides down and closes when malfunctions or overflow occur in the hydropower plant to cut off the water flow and prevent the accident from spreading.

[0038] Gate maintenance: When the facility is maintained, the downstream follow-up water is blocked to provide maintenance conditions. The working process of the follow-up water damper 3 includes closing under running water, opening and closing under static water, and a hydraulic opening and closing system. During closing under running water and opening and closing under static water, water pressure is absorbed from a lower reservoir when the gate is operating normally. To prevent the gate from being accidentally damaged by water pressure from an upper reservoir when fully closed, an automatic thrust relief device is installed on the gate. Under normal circumstances, the gate is opened and closed under static water conditions, and thrust compensation is achieved through a side pipe filled with water.The hydraulic opening and closing system consists of a set of hydraulic cylinders and an independent hydraulic control valve group, controlled by a local PLC (programmable logic controller). To ensure a reliable power supply, the hydraulic opening / closing device is equipped with two independent power supplies. The hydraulic pump station equipment and the on-site control cabinet are located in the central control room in the middle of the follow-up water gate cavity.

[0039] In one embodiment of the present utility model, it is provided that the bolt 1 and the nut 2 are connected to the spiral casing flap.

[0040] The bolt 1 and nut 2 are connected inside the volute casing flap to firmly mount the volute casing flap and detect the stress state at the wake water flap 3. The volute casing flap is provided in the structure of the volute casing of the hydro turbine. It is used to allow personnel to enter and exit the interior of the volute casing for inspection, maintenance, or emergency response. As a component of the volute casing structure, the volute casing flap must withstand internal and external water pressure, structural dead load, and possible dynamic loads. The volute casing flap includes the following: a door plate, a hinge and locking device, and a sealing and corrosion protection part. The door plate is usually made of high-strength steel or cast steel, and the thickness must meet the water pressure load requirements.The hinge and locking device influences the strength and ease of use of the door body through the hinge arrangement (inward opening or outward opening); the locking device ensures that the door body is reliably sealed even under high thrust. The sealing and anti-corrosion part includes a sealing strip between the door body and the door frame to prevent water leakage; the surface must be treated with anti-corrosion protection (e.g., coating or galvanizing).

[0041] The functions and operation of the volute casing door include the following: Inspection and maintenance: The volute casing door provides maintenance personnel with access to the interior of the volute casing, facilitating inspection of the inner wall, guide vanes, impeller, and other volute casing components. When the plant is shut down for maintenance, it must be ensured that the door body is well sealed to prevent water leakage. Emergency measures: In emergency situations, such as plant overflow or pipeline rupture, the volute casing door can be used as an emergency passage or isolation device. To ensure safe evacuation of personnel or emergency handling of equipment, a quick-opening mechanism must be provided.Sealing and thrust absorption: The volute casing valve must withstand the water pressure difference between the inside and outside, and its sealing performance directly impacts the safety of the power plant. The sealing strip material must be water pressure and corrosion-resistant and should be inspected and replaced regularly.

[0042] The embodiments of the present utility model disclose a tension detection system comprising the above-mentioned magnetically attached bolt tension detection sensor 4. The tension state detected by the magnetically attached bolt tension detection sensor 4 is processed so that a corresponding early warning signal is output in the event of an abnormality.

[0043] In a further development, it is provided that the voltage detection system can consist of a magnetically adhering sensor for detecting bolt voltage 4, a signal conditioning module, a data acquisition and processing unit, a power supply module, a display and alarm device and a communication module and the like.

[0044] Preferably, the tension detection system can be used to detect the bolt tension of the volute casing flap.

[0045] Preferably, the tension detection system can be used to detect the bolt tension of the follow-up water flap.

[0046] Preferably, the tension detection system may further comprise a signal conditioning device, a data acquisition and processing unit, a power supply module, a display and alarm device, and a communication module; wherein the signal conditioning device, the data acquisition and processing unit, the power supply module, the display and alarm device, and the communication module are each electrically connected to the magnetically adhering sensor for bolt tension detection.

[0047] The magnetic bolt tension sensor 4 is mounted on the surface of the bolt 1 by magnetic attraction and converts the tension change of the bolt 1 into an electrical signal (such as voltage, current, or frequency) by utilizing the magnetostrictive effect, the magnetoelastic effect, or the principle of magnetic induction. The signal conditioning module amplifies, filters, and linearizes the weak electrical signals output by the sensor to improve the signal-to-noise ratio and signal stability, thus facilitating subsequent acquisition and analysis. The data acquisition and processing unit uses a high-precision data acquisition card or a microcontroller (MCU) to perform analog-to-digital conversion (ADC) of the conditioned signal and extract voltage characteristics using integrated algorithms (such as Fourier transform, wavelet analysis, and the like).The power supply module provides a stable operating voltage for the magnetically attached bolt tension sensor 4, the signal conditioning module, and the data acquisition unit, and is typically powered by a lithium battery or an external DC adapter. The display and alarm device displays the tension value of bolt 1 in real time via a liquid crystal display (LCD) or digital tube installed on the device. When the tension exceeds the preset threshold, an audible and visual alarm is triggered to remind the operator to take action. The communication module supports wired (e.g., RS-485, CAN bus) or wireless (e.g., LoRa, Wi-Fi, 4G / 5G) communication methods and uploads tension data to the remote monitoring platform or cloud server for remote monitoring and early warning.

[0048] The entire work process may include: Mount and initialize the sensor, with the magnetic bolt tension sensor 4 attached to the end of the bolt 1 to ensure close contact through magnetic force. After power-up, the system automatically performs a zero-point calibration and a sensitivity calibration to eliminate environmental interference and individual sensor differences.

[0049] Voltage signal acquisition and processing: The magnetic bolt voltage sensor 4 detects the voltage changes of the bolt 1 in real time and outputs electrical signals to the signal conditioning module. The processed signal is converted into a digital signal by the ADC, and the MCU performs feature extraction and filtering to calculate the real-time voltage value of the bolt 1.

[0050] Data storage and display: voltage data is stored in local memory (e.g., EEPROM or SD card), and the current voltage value and historical trend chart are displayed on the LCD. The user can set a voltage threshold. If the detected value exceeds the limit, the alarm device is triggered.

[0051] Remote communication and monitoring: The communication module uploads voltage data to the cloud or a local server, allowing users to view the status of Bolt 1 in real time via a mobile app or the web. The system supports multi-node networking and can monitor the voltage distribution of multiple Bolt 1s simultaneously.

[0052] Maintenance and diagnostics: The system can have a self-diagnostic function that detects abnormal conditions such as sensor errors and communication interruptions and alerts maintenance personnel via an indicator light or remote notification. Regular calibration and battery replacement ensure long-term stable system operation.

[0053] The magnetic bolt tension detection sensor 4 is mounted on the end of the bolt 1, the bolt 1 being screwed to the nut 2, the structure of the magnetically adherent bolt tension detection sensor 4 comprising a sensor body 100 and a thrust assembly 200; The sensor body 100 comprises a sensing part 110 and a sensor head 120; the sensing part 110 is mounted on the bolt 1 and slidably connected to the bolt 1; the sensing head 120 is attached to the end of the bolt 1; the thrust assembly 200 is connected to the detection part 110 and is usable to move the detection part 110 along the axial direction of the bolt 1 until it fits onto the nut 2, so that the detection part 110 detects the tension at the connection between the bolt 1 and the nut 2.

[0054] Alternatively, it is provided that the detection part 110 comprises a ring magnet, wherein the inner ring of the ring magnet is placed on the bolt 1 and slidably connected to the bolt 1.

[0055] Alternatively, it is provided that the thrust assembly 200 comprises a thrust column group,

[0056] The push column group is connected to the detection part 110 and protrudes from the detection part 110.

[0057] Alternatively, it is provided that the thrust column group comprises a plurality of thrust columns 210, wherein the thrust columns 210 are evenly distributed along the circumferential direction.

[0058] Alternatively, it is intended that the number of push columns 210 is an even number.

[0059] Alternatively, it is provided that the push column 210 is a light column, wherein the light column is fixedly connected to the detection part 110 and the detection part 110 can be driven by pushing the light column so that the detection part moves along the axial direction of the bolt 1.

[0060] Alternatively, it is provided that the thrust column 210 has an external gear thread, wherein the detection part 110 has an internal gear thread that matches the external gear thread, wherein the external gear thread is coupled to the internal thread; wherein by rotating the thrust column 210, the detection part 110 can be moved in the axial direction of the bolt 1.

[0061] Alternatively, it is provided that the bolt 1 and the nut 2 are connected to the follow-up water flap 3.

[0062] Alternatively, it is provided that the bolt 1 and the nut 2 are connected to the spiral casing flap.

[0063] Finally, it should be noted that in this article, relational terms such as "first" and "second" or the like are used merely to distinguish one entity or operation from another entity or operation and do not necessarily require or imply any actual relationship or order between those entities or operations. Furthermore, the terms "comprises," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, procedure, item, or terminal device containing a list of elements may include not only those elements but also other elements not expressly listed, or may also include elements inherent in such a process, procedure, item, or terminal device. Without further limitation, a term defined by the statement "comprises" includes...’ does not exclude the presence of additional identical elements in the process, procedures, article or terminal which it comprises.

[0064] A magnetically adhering bolt tension detection sensor and a tension detection system provided in the present utility model are introduced in detail above, and the principle and embodiment of the utility model are described in detail in this article through concrete examples. The description of the above embodiments is only for understanding the method and core idea of the utility model; at the same time, changes in the specific implementation methods and application scope will occur to those of ordinary skill in the art according to the concept of the present utility model. In summary, the content of this specification should not be construed as a limitation of the present utility model.

Claims

[1] Magnetically adhesive sensor for bolt tension detection, characterized by that the bolt tension detection sensor is mountable on one end of a bolt, the bolt being screwed with a nut, the structure of the bolt tension detection sensor comprising a sensor body and a thrust assembly; wherein the sensor body comprises a sensing part and a sensor head; wherein the sensing part is mounted on the bolt and is slidably connected to the bolt; wherein the sensor head is attached to the end of the bolt; wherein the thrust assembly is connected to the detecting part and usable to move the detecting part along the axial direction of the bolt until the detecting part fits onto the nut, so that the detecting part can detect the tension at the connection between the bolt and the nut. [2] Sensor for detecting bolt tension according to claim 1, characterized bythat the detection part comprises a ring magnet, wherein the inner ring of the ring magnet is placed on the bolt and slidably connected to the bolt. [3] Sensor for detecting bolt tension according to one of the preceding claims, characterized by that the thrust assembly comprises a thrust column group which is connected to the detection part and protrudes from the detection part. [4] Sensor for detecting bolt tension according to claim 3, characterized by that the thrust column group comprises several thrust columns, wherein the thrust columns are evenly distributed along the circumferential direction. [5] Sensor for detecting bolt tension according to claim 4, characterized by that the number of push columns is an even number. [6] Sensor for detecting bolt tension according to claim 4 or 5, characterized bythat the push column is a light column which is fixedly connected to the detection part, wherein by pressing the light column the detection part is driven to move along the axial direction of the bolt. [7] Sensor for detecting bolt tension according to claim 4, 5 or 6, characterized by that the thrust column has an external gear thread, wherein the detection part has an internal gear thread that matches the external gear thread, wherein the external gear thread is coupled to the internal thread; wherein by rotating the thrust column, the detection part is movable in the axial direction of the bolt. [8] Sensor for detecting bolt tension according to one of the preceding claims, characterized by that the bolt and nut are connected to a follow-up water valve. [9] Sensor for detecting bolt tension according to one of the preceding claims, characterized by that the bolt and nut are connected to a volute casing flap. [10] Voltage detection system, characterized by a bolt tension detection sensor according to one of the preceding claims. [11] Voltage detection system according to claim 10, characterized by that a / the spiral casing flap can be used to detect the bolt tension. [12] Voltage detection system according to claim 10 or 11, characterized by that a / the follow-up water flap can be used to detect the bolt tension. [13] A tension detection system according to claim 10, 11 or 12, further comprising: a signal conditioning device, a data acquisition and processing unit, a power supply module, a display and alarm device, and a communication module; wherein the signal conditioning device, the data acquisition and processing unit, the power supply module, the display and alarm device, and the communication module are each electrically connected to the bolt tension detection sensor.

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