A bolt monitoring structure
By installing magnets and magnetic field direction sensors on bolts and nuts, and using heat-insulating mounting strips to isolate heat, the problem of sensor failure in high-temperature environments was solved, enabling real-time monitoring and loosening detection of bolts and nuts, and improving equipment safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHANGXING SHENGYANG TECH CO LTD
- Filing Date
- 2025-10-20
- Publication Date
- 2026-07-21
AI Technical Summary
Existing bolt monitoring systems are prone to sensor failure in high-temperature environments, resulting in the inability to monitor bolt status in real time and posing a safety hazard.
Magnets and magnetic field direction sensors are fixed to different parts of the bolt and nut respectively, and heat is isolated by heat-insulating mounting strips to prevent the sensors from directly contacting high temperatures, thereby enabling the monitoring of loosening of bolts and nuts.
Effective monitoring of bolt and nut loosening status in high-temperature environments prevents sensor failure, ensures real-time alarm function, and improves equipment safety and stability.
Smart Images
Figure CN224534994U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of detection device technology, and in particular relates to a bolt monitoring structure. Background Technology
[0002] Although bolts are tiny individual components, they are the key "links" for the stable operation of various mechanical equipment and large structures. From towering bridges to precision-operating mechanical devices, the reliability of bolt connections directly affects the safety and stability of the entire facility. However, bolts face many severe challenges during long-term service, such as bearing repeated mechanical loads and being corroded by complex environments. These factors cause problems such as bolt loosening, fatigue, corrosion, and even cracks to quietly emerge. If these problems are not detected and dealt with in time, they may lead to catastrophic consequences on site, causing huge economic losses and safety hazards.
[0003] Traditional bolt monitoring methods mainly rely on periodic manual inspections, which have obvious limitations: firstly, manual inspections are lagging and struggle to capture instantaneous changes in bolt condition; during the interval between inspections, bolt problems may have already developed and worsened. Secondly, the accuracy of manual inspections is subject to various factors such as the inspector's experience, skills, and on-site environmental conditions, making it difficult to guarantee accurate detection of problems every time. Therefore, online bolt monitoring systems have emerged. These systems overcome the limitations of time and space, enabling real-time sensing of bolt condition. Once abnormal signs appear, an alarm is triggered immediately, buying valuable time for timely and effective maintenance measures. This maximizes the safe and stable operation of industrial facilities, builds a robust industrial safety defense line, and effectively reduces potential safety risks, making it irreplaceable and of paramount importance.
[0004] Many field devices or pipelines face high-temperature and high-pressure environments. Installing sensors on bolts presents a challenge in terms of temperature range. Once the bolt temperature exceeds 85 degrees Celsius, most industrial sensor circuit components will fail, rendering them unusable. Moreover, under high-temperature conditions, studs and nuts are often wrapped with heat-insulating materials, which also brings problems to sensor installation. Summary of the Invention
[0005] The purpose of this invention is to overcome the shortcomings of the prior art by providing a bolt monitoring structure that solves the problem of sensor failure caused by high temperature during bolt and nut monitoring.
[0006] The technical solution of this utility model is as follows: A bolt monitoring structure includes a bolt and nut pair, a magnet, a magnetic field direction sensor, and a mounting bracket clamped and fixed on the bolt or nut. A heat-insulating mounting strip is fixedly installed on the mounting bracket. The magnet and the magnetic field direction sensor are respectively fixedly installed relative to two different components in the bolt and nut pair. The magnetic field direction sensor is fixedly installed on the heat-insulating mounting strip, and the magnet is located in the detection area of the magnetic field direction sensor.
[0007] In a further embodiment of this invention, the number of mounting supports is at least one, and each mounting support includes a fastening ring clamped to a bolt or nut and a mounting plate disposed on the fastening ring. Each mounting plate is directly or indirectly fixedly connected to the heat insulation mounting strip.
[0008] A further feature of this invention includes an adjusting plate, one end of which is fixedly connected to the mounting plate and the other end of which extends along the axial direction of the stud. The adjusting plate has a plurality of adjusting through holes distributed along the axial direction of the stud, and the heat-insulating mounting strip is fixedly connected to the adjusting plate through the adjusting through holes.
[0009] A further feature of this invention is that the mounting plate is provided with a groove for abutting against a nut or bolt.
[0010] In a further embodiment of this invention, the number of mounting supports is one, the mounting support is fixed to the nut, and the magnet is directly or fixedly mounted to the end face of the stud through a heat insulation pad.
[0011] In a further embodiment of this invention, the number of mounting supports is one, the mounting support is fixed to the nut, one end of the heat-insulating mounting strip is fixedly connected to the mounting support, and the other end extends along the circumferential direction of the bolt to the top of the stud end face and is then bent toward the radial direction of the bolt. The magnet is directly or fixedly mounted to the stud end face through the heat-insulating pad, and the magnetic field direction sensor is fixedly mounted on the part of the heat-insulating mounting strip located above the stud end face.
[0012] In a further embodiment of this invention, the number of mounting supports is two, and they are respectively fixed on bolts and nuts. One end of each of the two heat-insulating mounting strips is fixed on the corresponding mounting support, and the other end is a free end extending in the same direction. The magnet and the magnetic field direction sensor are respectively fixed on the two heat-insulating mounting strips.
[0013] In a further embodiment of this invention, the bolt and nut assembly includes a flange, and the bolt is fixed to a nut on each side of the flange. There are two mounting supports, which are fixedly mounted on the two nuts. One end of each of the two heat-insulating mounting strips is fixed to the corresponding mounting support, and the other end is a free end extending in the same direction. The magnet and the magnetic field direction sensor are fixedly mounted on the two heat-insulating mounting strips.
[0014] The beneficial effects of this utility model are as follows: By installing a heat-insulating mounting strip on the stud or nut, and fixing a magnet and a magnetic field direction sensor at the free end of the heat-insulating mounting strip, the heat in the bolt and nut assembly is difficult to be transferred to the magnetic field direction sensor and the magnet, preventing the magnetic field direction sensor and the magnet from failing due to heat contact. There is no need to wrap the stud or nut assembly with heat-insulating material, making the overall installation simple. The magnet and the magnetic field direction sensor extend in the same direction and are fixed to two different parts of the bolt and nut assembly. By periodically detecting the magnetic field angle of the magnet by the magnetic field direction sensor, it is possible to know whether the relative position of the bolt and nut has changed, thus realizing the monitoring of whether the bolt and nut are loose. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present utility model; Figure 2 This is a schematic diagram of the overall structure of another mounting support according to Embodiment 1 of this utility model; Figure 3 This is a schematic diagram of the overall structure of Embodiment 2 of this utility model; Figure 4 This is a schematic diagram of the overall structure of Embodiment 3 of this utility model; Figure 5 This is a schematic diagram of the overall structure of Embodiment 4 of this utility model.
[0016] In the diagram: 1. Magnet; 2. Magnetic field direction sensor; 3. Mounting support; 31. Fastening ring; 32. Mounting plate; 321. Groove; 4. Heat insulation mounting strip; 41. Adjusting plate; 43. Adjusting through hole. Detailed Implementation
[0017] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0018] It should be noted that in the description of this utility model, all directional indicators (such as up, down, forward, backward, etc.) are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.
[0019] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a number" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0020] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0021] like Figure 1-5 As shown, a bolt monitoring structure includes a bolt and nut pair, a magnet 1, a magnetic field direction sensor 2, and a mounting bracket 3 clamped and fixed to the bolt or nut. The number of mounting brackets 3 is at least one, and they can be made of metal. Each mounting bracket 3 is fixedly provided with a heat-insulating mounting strip 4. The heat-insulating mounting strip 4 is made of high-temperature resistant engineering plastic, and the length of the heat-insulating mounting strip 4 exceeds the thickness of the heat-insulating wrapping material.
[0022] The mounting bracket 3 includes a fastening ring 31 encircling the bolt or nut and a mounting plate 32 fixedly mounted on the fastening ring 31. When the mounting bracket 3 is fixed to the nut, the mounting bracket 3 can be a clamp-type structure or a bolt clamping structure. When the mounting bracket 3 is fixed to the bolt, the mounting bracket 3 can be a clamp-type structure. The mounting bracket 3 only needs to achieve fixation and has a mounting plate 32 for directly or indirectly fixing the heat insulation mounting strip 4.
[0023] Specifically, when the mounting bracket 3 is a clamp-type structure, the fastening ring 31 of the clamp-type mounting bracket is a clamp structure, which can be wrapped around the bolt or nut and then fixed to the mounting plate 32 by screws. The end of the screw can be prevented from loosening by a pin. In this scheme, the end face of the mounting plate 32 near the bolt or nut can be provided with a groove 321. During installation, the mounting bracket 3 is wrapped around the bolt or nut, tightened, and locked to the mounting plate 32 by screws. The groove wall of the groove 321 abuts against the outer wall of the bolt or nut. The heat insulation mounting strip 4 is fixedly set on the end face of the mounting plate 32 away from the bolt or nut by threaded connection.
[0024] Furthermore, when the mounting bracket 3 is a bolt clamping structure, the fastening ring 31 is a hexagonal clamping structure, which is fixedly clamped to the nut using a bolt and nut pair, and its mounting plate 32 can be fixed together to the bolt and nut pair used for clamping.
[0025] The magnet 1 and the magnetic field direction sensor 2 are respectively fixedly installed relative to two different components in the bolt and nut pair. The magnetic field direction sensor 2 is fixedly installed on the heat insulation mounting strip 4. The magnet 1 is installed in the detection area of the magnetic field direction sensor 2. The magnetic field direction sensor 2 can be used to transmit signals via wired or wireless connection. In the case of wireless connection, an explosion-proof battery can be installed inside. Example 1
[0026] like Figure 1-2 As shown, when the bolt and nut are not at high temperature: there is one mounting bracket 3, which is fixed to the nut. An adjusting plate 41 is also provided. One end of the adjusting plate 41 is fixedly connected to the mounting plate 32, and the other end extends along the axial direction of the stud. The adjusting plate 41 has several adjusting through holes 43 distributed along the axial direction of the stud. The heat-insulating mounting strip 4 is fixedly connected to the adjusting plate 41 through the adjusting through holes 43. The magnet 1 is directly or fixedly installed on the end face of the stud. Example 2
[0027] like Figure 3 As shown, when the bolt and nut are not at high temperature: there is one mounting bracket 3, which is fixed to the nut; one end of the heat-insulating mounting strip 4 is fixed to the mounting bracket 3, and the other end extends along the circumferential direction of the bolt to the top of the stud end face and is then bent toward the radial direction of the bolt; the magnet 1 is directly or fixedly installed on the stud end face through the heat-insulating pad; and the magnetic field direction sensor 2 is fixedly installed on the part of the heat-insulating mounting strip 4 located above the stud end face. Example 3
[0028] like Figure 4 As shown, when the bolts and nuts are at high temperatures: there are two mounting supports 3, which are fixedly installed on the bolts and nuts respectively. One end of each of the two heat-insulating mounting strips 4 is fixed on the corresponding mounting support 3, and the other end is a free end extending in the same direction. The extension distance is greater than the thickness required for the heat insulation material to be directly installed on the bolts and nuts. The end faces of the two heat-insulating mounting strips 4 are arranged parallel to each other. The magnet 1 and the magnetic field direction sensor 2 are fixedly installed on the end faces of the two heat-insulating mounting strips 4 respectively. Example 4
[0029] like Figure 5As shown, when the bolt and nut are at high temperature: In this embodiment, the bolt and nut pair is connected by a flange. After the bolt passes through the flange, a nut is screwed into each side of the flange to fix it. In this embodiment, the number of mounting supports 3 is two, and they are fixedly set on the two nuts respectively. One end of each of the two heat insulation mounting strips 4 is fixed on the corresponding mounting support 3, and the other end is a free end that extends in the same direction. The extension distance is greater than the thickness required for the heat insulation material to be directly installed on the bolt and nut. The end faces of the two heat insulation mounting strips 4 are arranged parallel to each other. The magnet 1 and the magnetic field direction sensor 2 are respectively fixedly set on the end faces of the two heat insulation mounting strips 4.
[0030] Specifically, by setting up a magnet 1 and a magnetic field direction sensor 2, which are respectively fixed to two different parts of the bolt and nut assembly, the magnetic field direction sensor 2 periodically detects the magnetic field angle of the magnet 1, thereby determining whether the relative position of the bolt and nut has changed, and realizing the monitoring of whether the bolt and nut are loose. Furthermore, a heat-insulating mounting strip 4 is installed on the stud or nut, and the magnet 1 and the magnetic field direction sensor 2 are fixed at the free end of the heat-insulating mounting strip 4. This makes it difficult for the heat in the bolt and nut assembly to be transferred to the magnetic field direction sensor 2 and the magnet 1, preventing the magnetic field direction sensor 2 and the magnet 1 from malfunctioning due to heat contact. There is no need to wrap the stud or nut assembly with heat-insulating material, and the overall installation is simple.
Claims
1. A bolt monitoring structure, comprising a bolt and nut pair, characterized in that, It includes a magnet (1), a magnetic field direction sensor (2), and a mounting bracket (3) clamped and fixed on a bolt or nut. A heat-insulating mounting strip (4) is fixedly installed on the mounting bracket (3). The magnet (1) and the magnetic field direction sensor (2) are respectively fixedly installed relative to two different components in the bolt and nut pair. The magnetic field direction sensor (2) is fixedly installed on the heat-insulating mounting strip (4). The magnet (1) is located in the detection area of the magnetic field direction sensor (2).
2. The bolt monitoring structure according to claim 1, characterized in that, The number of mounting supports (3) is at least one. The mounting support (3) includes a fastening ring (31) clamped on a bolt or nut and a mounting plate (32) set on the fastening ring (31). Each mounting plate (32) is directly or indirectly fixedly connected to the heat insulation mounting strip (4).
3. The bolt monitoring structure according to claim 2, characterized in that, It also includes an adjustment plate (41), one end of which is fixedly connected to the mounting plate (32), and the other end extends along the axial direction of the stud. The adjustment plate (41) has several adjustment through holes (43) distributed along the axial direction of the stud. The heat insulation mounting strip (4) is fixedly connected to the adjustment plate (41) through the adjustment through holes (43).
4. The bolt monitoring structure according to claim 2, characterized in that, The mounting plate (32) is provided with a groove (321) for abutting against a nut or bolt.
5. A bolt monitoring structure according to claim 3, characterized in that, The number of mounting supports (3) is one, the mounting support (3) is fixed around the nut, and the magnet (1) is directly or fixedly installed on the end face of the stud by means of a heat insulation pad.
6. A bolt monitoring structure according to claim 2, characterized in that, The number of mounting supports (3) is one. The mounting supports (3) are fixed around the nut. One end of the heat insulation mounting strip (4) is fixedly connected to the mounting support (3), and the other end extends along the circumferential direction of the bolt to the top of the stud end face and is bent in the radial direction of the bolt. The magnet (1) is directly or fixedly installed on the stud end face through the heat insulation pad. The magnetic field direction sensor (2) is fixedly installed on the part of the heat insulation mounting strip (4) located above the stud end face.
7. A bolt monitoring structure according to claim 2, characterized in that, The number of mounting supports (3) is two, and they are fixedly mounted on bolts and nuts respectively. One end of each of the two heat-insulating mounting strips (4) is fixed on the corresponding mounting support (3), and the other end is a free end extending in the same direction. The magnet (1) and the magnetic field direction sensor (2) are fixedly mounted on the two heat-insulating mounting strips (4) respectively.
8. A bolt monitoring structure according to claim 2, characterized in that, The bolt and nut assembly includes a flange, and the bolt is fixed with a nut on each side of the flange. There are two mounting supports (3), which are fixed on the two nuts respectively. One end of each of the two heat-insulating mounting strips (4) is fixed on the corresponding mounting support (3), and the other end is a free end that extends in the same direction. The magnet (1) and the magnetic field direction sensor (2) are fixed on the two heat-insulating mounting strips (4) respectively.