An open loop magnetic flux sensor

Abstract

The utility model discloses a kind of open-loop magnetic flux sensors, including split type magnetic flux firmware, the magnetic flux firmware is connected into annular structure by clamping structure, the outer wall of the magnetic flux firmware is pre-installed with inductive coil and excitation coil, the inductive coil and excitation coil are made using FPC flat cable, and the electrical connection of each layer FPC flat cable of inductive coil and excitation coil is realized by the FPC socket of setting at the end of flat cable.This open-loop magnetic flux sensor uses split type magnetic flux firmware, and can be quickly assembled into annular structure by clamping structure.Outside wall is pre-installed with factory accurate prefabricated FPC flat cable system inductive coil and excitation coil, effectively avoid the number of turns, tightness difference problem caused by artificial winding, significantly improve the consistency of sensor performance.Simultaneously, pre-installation design simplifies field construction procedure from complex winding operation to module assembly, cooperate clamping structure, greatly shorten construction period, reduce manpower cost.

Description

Technical Field

[0001] This utility model relates to the field of magnetic flux sensor technology, specifically an open-loop magnetic flux sensor. Background Technology

[0002] Magnetic flux sensors, as core equipment for measuring the stress on cable-driven metal components, play a crucial role in the field of structural health monitoring in bridge engineering. Traditional sleeve-type magnetic flux sensors, with their integrated design, need to be directly fitted into the cable during the cable production stage, making them only suitable for monitoring cable stress in newly constructed bridges. With the increasing demand for safety inspection of existing bridges, cable stress monitoring for already built bridges has gradually become a market focus, leading to the development of split-type, open-loop magnetic flux sensors. These sensors do not require pre-installation during cable manufacturing; they are fixed to the cable being measured on-site using split-type nylon fasteners, significantly expanding their applicability. Currently, the multi-layer, multi-turn enameled wire winding of the internal induction and excitation windings in open-loop magnetic flux sensors relies on manual operation. This requires extremely high winding skills and experience from the operators, and different operators can easily cause significant differences in parameters such as the number of turns and tightness of the windings, resulting in poor sensor performance consistency. At the same time, the manual winding process is cumbersome, requiring repeated adjustments to the wire turn layout and insulation treatment, which leads to long construction cycles and high labor costs. Therefore, a new type of open-loop magnetic flux sensor is needed. Utility Model Content

[0003] The purpose of this invention is to provide an open-loop magnetic flux sensor. By using a snap-fit ​​magnetic flux fastener in conjunction with a pre-installed coil, the consistency of sensor performance is improved, and on-site construction is made faster and more convenient, thereby solving the technical problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: An open-loop magnetic flux sensor includes a split magnetic flux firmware, which is connected into a ring structure by a snap-fit ​​structure. An induction coil and an excitation coil are pre-installed on the outer wall of the magnetic flux firmware. Both the induction coil and the excitation coil are made of FPC cabling. Each layer of FPC cabling of the induction coil and the excitation coil is electrically connected through an FPC socket located at the end of the cabling.

[0005] Preferably, the sidewall of the magnetic flux fastener is provided with anti-slip texture. The magnetic flux fastener includes an upper body and a lower body, which are connected by a snap-fit ​​structure. The induction coil is wound on the outer wall of the upper body, and the excitation coil is wound on the outer wall of the lower body.

[0006] Preferably, the number of adapter pins of the FPC socket is two more than the number of conductors of the FPC cable, and the two extra pins are used for cross-connection of the start and end of the adjacent FPC cable.

[0007] Preferably, the bottom of the magnetic flux firmware has a mounting hole, and an aviation plug is installed inside the mounting hole. The output end of the aviation plug is connected to the socket of an external detection device.

[0008] Preferably, a through hole for wiring is provided between the upper half and the lower half, and the FPC sockets of the induction coil and the excitation coil are connected to the input terminal of the aviation plug through wires passing through the through hole.

[0009] Preferably, a temperature sensor for real-time monitoring of ambient temperature is mounted on the bottom of the magnetic flux firmware, located on the side of the mounting hole, and the output line of the temperature sensor is connected to the input end of the aviation plug.

[0010] Preferably, the FPC cable of the induction coil has a diameter of 0.2 mm and has 100 conductors, the FPC cable of the excitation coil has a diameter of 0.5 mm and has 100-500 conductors, and each group of FPC cables has an insulating covering layer on its conductors.

[0011] Compared with the prior art, the beneficial effects of this utility model are: This open-loop magnetic flux sensor employs a modular magnetic flux connector, which can be quickly assembled into a ring structure via a snap-fit ​​mechanism. Its outer wall is pre-installed with factory-precisely pre-fabricated FPC (Flexible Printed Circuit) induction and excitation coils, effectively avoiding variations in the number of turns and tightness caused by manual winding, significantly improving the consistency of sensor performance. Simultaneously, the pre-installation design simplifies on-site construction from complex winding operations to modular assembly, and combined with the snap-fit ​​structure, greatly shortens the construction period and reduces labor costs. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the structure of this utility model from below; Figure 3 This is a schematic diagram of the installation structure of the FPC socket in this utility model; Figure 4 This is a schematic diagram of the external structure of the magnetic flux firmware in this application.

[0013] In the diagram: 1. Magnetic flux firmware; 11. Upper half; 12. Lower half; 2. Induction coil; 3. Excitation coil; 4. FPC socket; 5. Aviation plug; 6. Through hole; 7. Temperature sensor. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] This utility model provides: an open-loop magnetic flux sensor, such as... Figures 1-4 As shown, the magnetic flux measurement device includes a split-type magnetic flux measurement unit 1, which is connected into a ring structure via a snap-fit ​​mechanism. An induction coil 2 and an excitation coil 3 are pre-installed on the outer wall of the magnetic flux measurement unit 1. Both the induction coil 2 and the excitation coil 3 are made of FPC (Flexible Printed Circuit) cabling. Each layer of the FPC cabling in the induction coil 2 and the excitation coil 3 is electrically connected via an FPC socket 4 located at the end of the cabling. The split-type magnetic flux measurement unit 1 consists of an upper half 11 and a lower half 12, which can be quickly assembled into a ring structure via the snap-fit ​​mechanism for easy and rapid installation. The induction coil 2 and the excitation coil 3 are pre-installed on the outer wall of the magnetic flux measurement unit 1 after being prefabricated in the factory using FPC cabling, replacing traditional manual on-site winding. The FPC cabling uses photolithography and other processes to precisely control the number of turns, wire diameter, and spacing, solving the problem of inconsistent turn count and tightness during manual winding and ensuring stable performance of different batches of sensors. Simultaneously, the pre-installation design means that on-site construction only requires the snap-fit ​​assembly of the magnetic flux measurement unit 1, eliminating the need for complex winding operations, significantly shortening the construction cycle and reducing labor costs. FPC socket 4 is installed at the end of the FPC cable and is used to realize the electrical connection between the layers of induction coil 2 and excitation coil 3.

[0016] Preferably, the magnetic flux fixing device 1 has anti-slip textured sidewalls. The magnetic flux fixing device 1 includes an upper body 11 and a lower body 12, which are connected by a snap-fit ​​structure. The induction coil 2 is wound around the outer wall of the upper body 11, and the excitation coil 3 is wound around the outer wall of the lower body 12. The anti-slip textured sidewalls of the magnetic flux fixing device 1 increase the friction with the cable being measured, preventing the sensor from slipping during use and ensuring measurement accuracy. The upper body 11 and lower body 12 are tightly connected by the snap-fit ​​structure, forming a complete annular magnetic circuit, and can be quickly assembled and disassembled. The induction coil 2 and excitation coil 3 are respectively arranged on the outer walls of the upper body 11 and lower body 12. This arrangement makes the magnetic field distribution more uniform, and the alternating magnetic field generated by the excitation coil 3 can be effectively conducted to the induction coil 2 through the magnetic flux fixing device 1, improving the magnetic coupling efficiency and signal sensing sensitivity of the sensor.

[0017] Furthermore, the FPC socket 4 has two more adapter pins than the FPC cable has conductors. These two extra pins are used for cross-connection of the start and end points of adjacent FPC cables. These two extra pins in the FPC socket 4 are specifically for cross-connection of adjacent FPC cables, allowing current to switch smoothly between multiple layers of cables, forming a complete electrical circuit. This avoids the tedious process of manually soldering interlayer connections, reduces contact resistance and potential for failure at connection points, and ensures the electrical connection accuracy of multi-layer coils, improving the reliability and stability of the sensor.

[0018] Furthermore, the bottom of the magnetic flux sensor 1 has a mounting hole, inside which an aviation connector 5 is installed. The output end of the aviation connector 5 connects to the socket of an external detection device. The mounting hole at the bottom of the magnetic flux sensor 1 provides a mounting position for the aviation connector 5, which is used to connect to the external detection device. By inserting the aviation connector 5 into the corresponding socket of the external detection device, the sensor and the detection system can be quickly connected, transmitting data from the induction coil 2, the excitation coil 3, and the temperature sensor 7. This connection method facilitates quick installation and disassembly in the field.

[0019] It is worth noting that a through-hole 6 for wiring is provided between the upper body 11 and the lower body 12. The FPC sockets 4 of the induction coil 2 and the excitation coil 3 are connected to the input terminal of the aviation plug 5 via wires passing through the through-hole 6. The through-hole 6 provides a wiring channel for the connection wires of the induction coil 2 and the excitation coil 3, allowing the wires between the FPC socket 4 and the aviation plug 5 to be arranged in an orderly manner, avoiding the wires from being tangled or squeezed inside the sensor. The wires passing through the through-hole 6 connect the FPC socket 4 and the aviation plug 5, transmitting the induction signal generated by the induction coil 2 and the drive signal of the excitation coil 3 to the external detection equipment. This ensures the stability of signal transmission while making the internal structure of the sensor more compact, facilitating installation and maintenance.

[0020] Specifically, a temperature sensor 7 for real-time ambient temperature monitoring is mounted on the bottom of the magnetic flux sensor 1, located on the side of the mounting hole. The output line of the temperature sensor 7 is connected to the input terminal of the aviation connector 5. The temperature sensor 7 is used to monitor the temperature of the sensor's operating environment in real time. Since the performance of the magnetic flux sensor is affected by temperature changes, the temperature data collected by the temperature sensor 7 is transmitted to an external detection device via the output line and the aviation connector 5. The external detection device performs temperature compensation on the sensor's measurement results based on the temperature data to ensure the reliability of the measurement results.

[0021] Temperature sensor 7 uses an NTC thermistor. NTC thermistors have a negative temperature coefficient, and their resistance decreases exponentially with increasing temperature. This complements the temperature-dependent characteristics of magnetic flux sensors, facilitating rapid acquisition of temperature data through a simple voltage divider circuit. After transmitting the data to external detection equipment via aviation connector 5, temperature compensation for the magnetic flux measurement can be quickly achieved.

[0022] More specifically, the FPC cable of induction coil 2 has a wire diameter of 0.2mm and 100 conductors, while the FPC cable of excitation coil 3 has a wire diameter of 0.5mm and 100-500 conductors. Each set of FPC cables has an insulating cover layer on its conductors. The use of different wire diameters and conductor numbers for induction coil 2 and excitation coil 3 is to meet their respective functional requirements. Induction coil 2 needs to sense changes in the magnetic field with high sensitivity; the finer 0.2mm wire diameter and 100 conductors help improve sensing accuracy. Excitation coil 3 needs to carry a larger driving current; the 0.5mm wire diameter and 100-500 conductors reduce coil resistance and heat generation. The insulating cover layer on the conductors of each set of FPC cables prevents short circuits between adjacent conductors, ensuring stable electrical performance. Furthermore, the insulating cover layer is pre-attached to the FPC cable during factory fabrication, eliminating the need for on-site insulation treatment, further simplifying the construction process and improving production efficiency and product reliability.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An open-loop magnetic flux sensor, characterized in that: The device includes a split magnetic flux firmware (1), which is connected into a ring structure by a snap-fit ​​structure. The outer wall of the magnetic flux firmware (1) is pre-installed with an induction coil (2) and an excitation coil (3). Both the induction coil (2) and the excitation coil (3) are made of FPC cables. Each layer of the FPC cable of the induction coil (2) and the excitation coil (3) is electrically connected through an FPC socket (4) at the end of the cable.

2. The open-loop magnetic flux sensor according to claim 1, characterized in that: The magnetic flux fastener (1) has anti-slip texture on its sidewall. The magnetic flux fastener (1) includes an upper body (11) and a lower body (12). The upper body (11) and the lower body (12) are connected by a snap-fit ​​structure. The induction coil (2) is wound around the outer wall of the upper body (11), and the excitation coil (3) is wound around the outer wall of the lower body (12).

3. The open-loop magnetic flux sensor according to claim 2, characterized in that: The number of adapter pins of the FPC socket (4) is two more than the number of conductors of the FPC cable. The two extra pins are used for cross-connection of the start and end of the adjacent FPC cable.

4. An open-loop magnetic flux sensor according to claim 3, characterized in that: The magnetic flux firmware (1) has a mounting hole at its bottom, and an aviation plug (5) is installed inside the mounting hole. The output end of the aviation plug (5) is connected to the socket of an external detection device.

5. An open-loop magnetic flux sensor according to claim 4, characterized in that: A through hole (6) for wiring is provided between the upper half (11) and the lower half (12). The FPC socket (4) of the induction coil (2) and the excitation coil (3) are connected to the input end of the aviation plug (5) through the through hole (6) by wires.

6. An open-loop magnetic flux sensor according to claim 5, characterized in that: The bottom of the magnetic flux firmware (1) is equipped with a real-time ambient temperature sensor (7) located on the side of the mounting hole. The output line of the temperature sensor (7) is connected to the input end of the aviation plug (5).

7. An open-loop magnetic flux sensor according to claim 6, characterized in that: The FPC cable of the induction coil (2) has a diameter of 0.2 mm and a number of 100 conductors. The FPC cable of the excitation coil (3) has a diameter of 0.5 mm and a number of 100-500 conductors. Each FPC cable conductor is provided with an insulating covering layer.

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