Hybrid excitation type magnetic flux sensor

Abstract

The utility model discloses a hybrid excitation type magnetic flux sensor, which comprises a shell, and a magnetization mechanism is arranged in the shell. The magnetizing mechanism comprises an exciting coil and a yoke assembly, two ends of the yoke assembly are respectively connected with a permanent magnet, the exciting coil is wound on the periphery of the middle part of the yoke assembly, and two ends of the exciting coil respectively penetrate out of the shell and then extend outwards. Through the design of integrating the permanent magnet and the weak excitation coil, the cable force detection of the steel cable is improved, so that the magnetizing device not only can be quickly mounted and dismounted on the steel cables with different diameters, but also has strong adaptability, does not need a complicated fixing structure, and can flexibly select the number of devices according to actual requirements to ensure effective magnetization; due to the fact that the steel cable is magnetized by the permanent magnet firstly, the steel cable can be fully magnetized only through small signal excitation, the excitation voltage requirement is lowered, the safety and the long-term effect of equipment are improved, meanwhile, external magnetic field interference is reduced, and high measurement precision is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to steel cable lock cable force detection technical field, concretely relates to a kind of mixed excitation type magnetic flux sensor. BACKGROUND

[0002] Steel cable as the key load-bearing component of many large buildings and structures, its stress state is directly related to the safety and stability of the entire structure. When the cable force exceeds or is lower than the design standard, it may cause structural damage, and even lead to the collapse of infrastructure such as bridges. Therefore, regular accurate measurement of cable force is necessary to find potential problems and take preventive measures to avoid accidents. Cable force detection technology is mainly divided into two categories: direct detection methods that can intuitively and simply read data but may cause slight damage to the structure and affect its integrity, such as pressure sensor method, dynamometer method and hydraulic loading method; and indirect detection methods that do not damage the structure and have high repeatability, but the accuracy is limited by various factors and the data analysis process is complex and requires calibration, such as frequency method, acoustic wave method and magnetic flux method.

[0003] Among them, indirect detection methods often use sleeve type magnetic flux sensors or bypass type magnetic flux sensors for detection.

[0004] The sleeve type magnetic flux sensor is tightly fitted on the steel cable to ensure good contact between the sensor and the steel cable surface to obtain accurate data. However, the existing sleeve type magnetic flux sensor has the following problems:

[0005] (1) The diameter of medium-sized bridge cables generally reaches about 100 mm, and large-span cables can reach 300 mm. Since the bridge cables are fixed and cannot be removed, the installation of sleeve type sensors requires on-site winding, which is time-consuming and once installed, it is often not removed, and the cable force cannot be directly calibrated in service, which is not convenient for subsequent maintenance and use.

[0006] (2) Traditional magnetic flux sensors excite cables, and larger diameter cables require higher excitation voltage. High excitation voltage requires higher design requirements for instruments, and cannot guarantee the long-term effectiveness of the instrument.

[0007] The bypass type magnetic flux sensor uses a partially enclosed or open structure to sense magnetic field changes, but since the bypass type magnetic flux sensor is an open structure, it is affected by external magnetic fields during detection. For large diameter cables, the bypass structure excitation effect is not good, which can lead to low measurement accuracy.

[0008] In summary, the existing indirect detection related equipment needs to be improved to accurately and quickly detect the cable force of steel cable locks. UTILITY MODEL CONTENTS

[0009] The utility model provides a kind of mixed excitation magnetic flux sensor for the deficiencies of sleeve type magnetic flux sensor of indirect detection method, which is time-consuming to install, difficult to disassemble and unable to calibrate in service, and bypass type magnetic flux sensor is easily affected by external magnetic field during detection, with poor detection accuracy.

[0010] To achieve the above object, the technical scheme of the utility model is as follows:

[0011] A kind of mixed excitation magnetic flux sensor, including shell, magnetizing mechanism is installed inside shell;The magnetizing mechanism includes excitation coil and yoke assembly, wherein the yoke assembly is respectively connected with permanent magnet at both ends, and excitation coil is wound on the outer periphery of the middle part, and both ends of excitation coil extend outward after passing through shell;The yoke assembly includes a square yoke and a cylindrical yoke, wherein the cylindrical yoke is respectively connected with square yoke at both ends, forming concave structure;Permanent magnet is fixedly connected to the top of the square yoke;The excitation coil is wound on the cylindrical yoke.

[0012] In use, the cylindrical yoke can store several, and different cylindrical yokes can be wound with different winding coils, so that the staff can quickly replace the cylindrical yoke with different winding excitation coils according to the different diameters of the steel cable line during detection, facilitating the detection operation, and the concave structure composed of square yoke and cylindrical yoke is adsorbed on the steel cable lock by permanent magnet during use, and the hollow position is convenient for installing flexible magnetic sensor;Since the excitation coil is only wound on the cylindrical yoke, compared with the traditional full-wrapped sleeve design, the amount of coil is greatly reduced, the voltage required for excitation is reduced, the instrument design is simplified, and the safety and long-term effectiveness of the equipment are improved;And the structure also provides greater flexibility for the installation of the sensor, so that it can better adapt to different field environments and steel cable sizes, ensuring the high precision and reliability of measurement results.

[0013] Further, the square yoke is provided with a notch matched with the cylindrical yoke, and a threaded hole communicating with the notch is provided at the top, and a screw is installed in the threaded hole;The cylindrical yoke is provided with a screw hole corresponding to the position of the threaded hole, and the screw passes through the threaded hole of the square yoke and the screw hole of the cylindrical yoke in sequence to complete the connection.

[0014] Further, the shell adopts a split design, which is composed of two half shells and connecting bolts; the two half shells are connected by the connecting bolts at the top and the bottom. When in use, the magnetizing mechanism is included inside the shell from both sides, and then the two half shells are connected by the connecting bolts to form a whole; the split design of the shell can directly wrap the magnetizing mechanism inside the shell from both sides, without the need for additional space or complex installation steps, facilitating the assembly of the device and subsequent maintenance and repair work.

[0015] Further, the half shell side is also provided with a wire outlet hole, and the two ends of the excitation coil respectively extend outward through the wire outlet hole. The design of the wire outlet hole facilitates the setting of the excitation coil and can facilitate subsequent use.

[0016] Use method:

[0017] The number of turns of the excitation coil can be adaptively designed according to the diameter of the steel cable. Since the bottom of the device is a permanent magnet, it can be adsorbed on the surface of the steel cable without the need for additional fixing devices. During detection, the number of magnetizing devices is selected according to the diameter of the steel cable, and the selected magnetizing devices are adsorbed on the steel cable in a circular manner by the permanent magnet. After the installation of the magnetizing device is completed, the flexible magnetic sensor is installed on the steel cable between the magnetizing devices. The magnetizing devices are extended to the outside of the shell and connected to the excitation coil, so that the magnetizing devices are connected together, and then the connected wire is connected to the magnetoelastic instrument. The excitation coil is excited, and since the steel cable has been magnetized by the permanent magnet, only a small signal excitation is needed for the excitation coil to fully magnetize the steel cable. Then the signal collected by the flexible magnetic sensor is transmitted to the personal computer for analysis by using the inductive signal collection device. The flexible magnetic sensor, the magnetoelastic instrument and the inductive signal collection device are all common equipment used in existing detection, so they will not be described here.

[0018] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0019] 1.The utility model discloses a design of integrating permanent magnet and weak excitation coil, realizes the improvement of steel cable force detection, makes magnetizing device not only can install and detach on the steel cable of different diameters quickly, and adaptability is strong, need not complex fixed structure, can also choose the device number according to actual need to ensure effective magnetization, because the steel cable is magnetized by permanent magnet first, therefore only needs small signal excitation to magnetize the steel cable fully, reduces the demand of excitation voltage, improves the safety and long -term effectiveness of equipment, reduces the outside magnetic field interference simultaneously, guarantees the high accuracy of measurement, in addition, this device allows repeated installation and detachment, is convenient for multiple measurements at different positions or time points and in -service calibration, thereby provides more accurate, reliable cable force data, helps to find the security risk in time and takes preventive measures, effectively improves the safety management level of large -scale building and structure.

[0020] 2.The concave structure composed of square yoke iron and cylindrical yoke iron is adsorbed on the steel cable lock through permanent magnet when in use, the hollow position of the concave structure is convenient for installing flexible magnetic elastic sensor, the excitation coil is only wound on the cylindrical yoke iron, reduces the amount of coil and reduces the voltage required for excitation, improves the safety and long -term effectiveness of equipment;Square yoke iron and cylindrical yoke iron are detachably connected through screws, convenient and reliable connection, and the screw connection mode makes the magnetizing device can be flexibly adjusted according to actual needs, convenient to disassemble and maintain;The split design of the shell can directly wrap the magnetizing mechanism in the shell from both sides, without additional space or complex installation steps, convenient for device assembly and subsequent maintenance and repair work, and the design of the outlet hole facilitates the setting of the excitation coil. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the three -dimensional structure schematic diagram of the magnetizing mechanism of the mixed excitation type magnetic flux sensor described in embodiment 1.

[0022] Figure 2 It is the use schematic diagram when the mixed excitation type magnetic flux sensor described in embodiment 2 is connected with the steel cable.

[0023] Figure 3 It is the use schematic diagram when the mixed excitation type magnetic flux sensor described in embodiment 3 is connected with the steel cable.

[0024] IDENTIFICATION OF DRAWINGS:

[0025] 1-screw, 2-square yoke iron, 3-permanent magnet, 4-cylindrical yoke iron, 5-excitation coil, 6-steel cable 7-shell, 8-flexible magnetic elastic sensor, 9-outlet hole, 10-connection bolt. DETAILED DESCRIPTION

[0026] The utility model is further described below in connection with the drawings.

[0027] Embodiment 1: A hybrid excitation magnetic flux sensor, comprising a shell 7, a magnetizing mechanism is installed inside the shell 7; the magnetizing mechanism comprises an excitation coil 5 and a yoke assembly, wherein a permanent magnet 3 is connected to each end of the yoke assembly, and the excitation coil 5 is wound on the outer periphery of the middle part of the yoke assembly, and the two ends of the excitation coil 5 extend outward after passing through the shell 7.

[0028] As shown in Figure 1 , the yoke assembly comprises a square yoke 2 and a cylindrical yoke 4, wherein the two ends of the cylindrical yoke 4 are connected with the square yoke 2 to form a concave structure; the top of the square yoke 2 is fixedly connected with the permanent magnet 3; and the excitation coil 5 is wound on the cylindrical yoke 4. In use, a plurality of cylindrical yokes 4 can be stored, and different cylindrical yokes 4 can be wound with different winding coils. During detection, the operator can quickly replace the cylindrical yoke 4 with a different winding excitation coil 5 according to the different diameters of the steel cable line, facilitating the detection operation. The concave structure formed by the square yoke 2 and the cylindrical yoke 4 is adsorbed on the steel cable lock by the permanent magnet 3 during use, and the hollow position is convenient for installing the flexible magnetic elastic sensor 8. Since the excitation coil 5 is only wound on the cylindrical yoke 4, compared with the traditional full-wrapped sleeve design, the amount of coil is greatly reduced, the voltage required for excitation is reduced, the instrument design is simplified, and the safety and long-term effectiveness of the device are improved. The structure also provides greater flexibility for the installation of the sensor, allowing it to better adapt to different field environments and steel cable sizes, ensuring high precision and reliability of the measurement results.

[0029] Embodiment 2: The difference from embodiment 1 is that the shell 7 adopts a split design, which is composed of two half-shells and connecting bolts 10; the top and bottom ends of the two half-shells are connected by connecting bolts 10. In use, the magnetizing mechanism is included inside the shell 7 from both sides, and then the two half-shells are connected by connecting bolts 10 to form a whole; the split design of the shell 7 can directly wrap the magnetizing mechanism inside the shell 7 from both sides, without the need for additional space or complex installation steps, facilitating the assembly of the device and subsequent maintenance and repair work.

[0030] The number of turns of the excitation coil 5 in this embodiment can be adaptively designed according to the diameter of the steel cable 6; since the bottom of the device is a permanent magnet 3, it can be adsorbed on the surface of the steel cable 6 without the need for additional fixing devices; during detection, the number of magnetizing devices is selected according to the diameter of the steel cable 6, Figure 2As shown, the selected three magnetization devices are respectively adsorbed on the steel cable 6 in a circumferential manner through the permanent magnets 3. When the magnetization devices are installed, the flexible magnetoelastic sensor 8 is installed on the steel cable 6 in the middle of the magnetization devices; the magnetization devices are extended to the outside of the shell 7 to connect the excitation coils, so that the magnetization devices are connected together, and then the connected wires are connected to the magnetoelastic instrument, the excitation coil 5 is excited, since the steel cable 6 has been magnetized by the permanent magnet 3, only a small signal excitation is needed for the excitation coil 5 to fully magnetize the steel cable 6, and then the collected signals of the flexible magnetoelastic sensor are transmitted to the personal computer for analysis by using the inductive signal collection device. The flexible magnetoelastic sensor 8, the magnetoelastic instrument and the inductive signal collection device are all common devices used in existing detection, so they will not be described again.

[0031] In example 3, the square yoke 2 is provided with a notch matched with the cylindrical yoke 4, and a threaded hole communicating with the notch is provided at the top, and a screw 1 is installed in the threaded hole; the cylindrical yoke 4 is provided with a screw hole corresponding to the position of the threaded hole, and the screw 1 is sequentially connected through the threaded hole of the square yoke 2 and the screw hole of the cylindrical yoke 4. The square yoke 2 and the cylindrical yoke 4 are detachably connected by the screw 1, which is convenient and reliable, and the connection by the screw 1 makes the magnetization device flexible to adjust according to actual needs, which is convenient for disassembly and maintenance, and increases the service life of the equipment; the half-shell side is also provided with a wire outlet hole 9, and the two ends of the excitation coil 5 extend outward through the wire outlet hole 9. The design of the wire outlet hole 9 facilitates the setting of the excitation coil 9, and facilitates subsequent use.

[0032] The number of turns of the excitation coil 5 in this embodiment can be adaptively designed according to the diameter of the steel cable 6; since the bottom of the device is a permanent magnet 3, it can be adsorbed on the surface of the steel cable 6 without the need for additional fixing devices; during detection, the number of magnetization devices is selected according to the diameter of the steel cable 6, such as Figure 3 As shown, the selected three magnetization devices are respectively adsorbed on the steel cable 6 in a circumferential manner through the permanent magnets 3. When the magnetization devices are installed, the flexible magnetoelastic sensor 8 is installed on the steel cable 6 in the middle of the magnetization devices; the magnetization devices are extended to the outside of the shell 7 to connect the excitation coils, so that the magnetization devices are connected together, and then the connected wires are connected to the magnetoelastic instrument, the excitation coil 5 is excited, since the steel cable 6 has been magnetized by the permanent magnet 3, only a small signal excitation is needed for the excitation coil 5 to fully magnetize the steel cable 6, and then the collected signals of the flexible magnetoelastic sensor are transmitted to the personal computer for analysis by using the inductive signal collection device. The flexible magnetoelastic sensor 8, the magnetoelastic instrument and the inductive signal collection device are all common devices used in existing detection, so they will not be described again.

[0033] In the description of the present utility model, a large number of specific details are explained. However, it can be understood that the embodiments of the present utility model can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail in order not to obscure the understanding of this description.

[0034] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and not to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model, and they should be covered in the scope of the claims and the description of the present utility model.

Claims

1. A hybrid excitation flux sensor, characterized by: The application relates to a magnetizing device, which comprises a shell (7) internally provided with a magnetizing mechanism; the magnetizing mechanism comprises an excitation coil (5) and a yoke assembly, wherein permanent magnets (3) are connected to the two ends of the yoke assembly respectively, the outer periphery of the middle part of the yoke assembly is wound with the excitation coil (5), and the two ends of the excitation coil (5) respectively extend outwards after penetrating through the shell (7); the yoke assembly comprises a square yoke (2) and a cylindrical yoke (4), wherein the two ends of the cylindrical yoke (4) are connected with the square yoke (2) respectively to form a concave structure; the top of the square yoke (2) is fixedly connected with the permanent magnet (3); and the excitation coil (5) is wound on the cylindrical yoke (4).

2. A hybrid excitation flux sensor as claimed in claim 1, characterized in that: The square yoke (2) is provided with a notch matched with the cylindrical yoke (4), and a threaded hole communicated with the notch is arranged at the top of the square yoke (2), and a screw (1) is arranged in the threaded hole; the cylindrical yoke (4) is provided with a screw hole corresponding to the position of the threaded hole, and the screw (1) is sequentially connected through the threaded hole of the square yoke (2) and the screw hole of the cylindrical yoke (4).

3. A hybrid excitation flux sensor as claimed in claim 1, characterized in that: The shell (7) adopts a split type design and is composed of two half shells and connecting bolts (10); the two half shells are connected through the connecting bolts (10) at the two ends of the top and the bottom.

4. A hybrid excitation flux sensor as claimed in claim 3, characterized in that: The half shell is further provided with a wire outlet hole (9) at the side, and the two ends of the excitation coil (5) respectively extend outwards through the wire outlet hole (9).

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