Magnetic field testing device

Abstract

A magnetic field testing device disclosed by the present invention comprises a bearing base, a measurement assembly, a magnetic field simulation assembly, a power assembly and a control assembly, the magnetic field simulation assembly and the power assembly are fixed above the bearing base, and the measurement assembly is arranged on the bearing base. The control assembly is connected with and controls the magnetic field simulation assembly, the measurement assembly and the power assembly, and when an object penetrates through a magnetic field simulated by the magnetic field simulation assembly, the measurement assembly collects magnetic field information. The control assembly is connected with and controls the magnetic field simulation assembly, the measuring assembly and the power assembly, when an object penetrates through a magnetic field simulated by the magnetic field simulation assembly, the measuring assembly collects magnetic field information, a worker can control the whole magnetic field testing device only by operating the control assembly, the convenience is greatly improved, and the working efficiency is improved. And the test accuracy is greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of magnetic field testing, and particularly to a magnetic field testing device. Background Art

[0002] Electromagnetism is a reaction of energy and also a general term for the electrical and magnetic properties exhibited by matter, such as electromagnetic induction, electromagnetic waves, electromagnetic fields, etc. All electromagnetic phenomena are inseparable from the electric field; and the magnetic field is generated by moving charges (electric quantity). With the large-scale construction of power grids and the continuous increase of voltage levels, the electromagnetic environment around transmission lines has gradually become an extremely concerned issue for people. As a technical means of visualizing the electric and magnetic field intensities, electromagnetic environment measurement is widely used in actual projects and electromagnetic environment measurement experiments in universities.

[0003] Chinese Patent Application CN219154498U discloses a trolley for electromagnetic environment measurement experiments of transmission lines, which is carried by the load capacity of the trolley for the magnetic field and is manually driven. It is labor-consuming and difficult to master the movement trajectory and movement speed. Moreover, the magnetic field tester in this invention is installed on the trolley, and it is impossible to provide a stable test environment and a fixed test location. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a magnetic field testing device.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: A magnetic field testing device of the present invention includes a bearing base, a measurement component, a magnetic field simulation component, a power component, and a control component. The magnetic field simulation component and the power component are fixed above the bearing base. The measurement component is arranged on the bearing base. The control component is connected to and controls the magnetic field simulation component, the measurement component, and the power component. When an object passes through the magnetic field simulated by the magnetic field simulation component, the measurement component collects magnetic field information.

[0006] As a preferred technical solution of the present invention, the bearing base adopts a wooden structure. There are two steel rails arranged above the bearing base. The steel rails are arranged in parallel on the bearing base. A sleeper component is also arranged above the bearing base. The sleeper component is arranged between the steel rails and the bearing base. A carrier vehicle is arranged above the steel rails. An unmanned boat is detachably connected above the carrier vehicle. Clamping components are symmetrically arranged on the left and right sides of the carrier vehicle to fix the unmanned boat. The clamping components include hydraulic telescopic arms and arc-shaped grippers. The arc-shaped grippers contact the outer surface of the unmanned boat. First blocking blocks are symmetrically arranged on the front and rear sides of the carrier vehicle.

[0007] As a preferred technical solution of the present invention, the casting length of the bearing foundation is 50M, the width is 6M, and the thickness is not less than 100MM. The steel rail is a heavy steel rail made of 20Mn23A1V non-magnetic steel. The sleeper assembly includes longitudinal support columns and transverse tensile beams. The longitudinal support columns are arranged below the steel rail, and the two longitudinal support columns are fixedly connected by a transverse tensile beam. The sleeper assembly further includes diagonal braces, which are obliquely arranged between the longitudinal support columns and the transverse tensile beams, with one end fixedly connected to the upper end of the longitudinal support column and the other end fixedly connected to the transverse tensile beam. A detection column is arranged at the top of the longitudinal support column.

[0008] As a preferred technical solution of the present invention, the power assembly includes an electric winch, which is arranged at the upper right end of the bearing foundation. The power assembly further includes a pulley, which is arranged at the upper left end of the bearing foundation. A cable is connected between the electric winch and the pulley, and the cable is fixedly connected to the carrier vehicle and drags the carrier vehicle to move and brake.

[0009] As a preferred technical solution of the present invention, the control assembly sends a magnetic field simulation instruction to the magnetic field simulation assembly and a magnetic field measurement instruction to the measurement assembly. The measurement assembly is arranged on the detection column. The measurement assembly uses a fluxgate sensor and collects, displays, analyzes, stores, exports, and manages magnetic field information. The acquisition function includes acquisition frequency setting and acquisition start / stop control. The analysis includes data display, time-domain waveform display, and spectrum analysis. The data management includes data storage, data export, and report generation. The measurement assembly is made of non-magnetic aluminum alloy material.

[0010] As a preferred technical solution of the present invention, the main body of the magnetic field simulation assembly is composed of coils, which are arranged around the steel rail. The size of the uniform area of the coil is φ3×20m, and the uniformity is greater than 90%. The magnetic field intensity simulated by it is: 100μT vertically, and 70μT longitudinally and transversely respectively.

[0011] As a preferred technical solution of the present invention, a limit switch and a speed measurement assembly are arranged on the side of the detection column. The limit switch is electrically connected to the power assembly. When the carrier vehicle passes the limit switch, the power assembly stops running. The speed measurement assembly includes a laser emitter and a laser receiver, which are respectively arranged on two symmetric detection columns.

[0012] As a preferred technical solution of the present invention, a second blocking block is arranged above the end of the steel rail in the direction of the magnetic field simulation assembly.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The control component is connected to and controls the magnetic field simulation component, the measurement component, and the power component. When an object passes through the magnetic field simulated by the magnetic field simulation component, the measurement component collects magnetic field information. The staff can control the entire magnetic field testing device by simply operating the control component, which greatly increases convenience and significantly improves the accuracy of the test. 2. The clamping component, the electric winch, and the magnetic field simulation component all make the entire experimental process highly adjustable: by adjusting the clamping component, it can adapt to different test objects; by adjusting the electric winch, it can pull unmanned boats of different weights and control the forward speed of the unmanned boat; the magnetic field simulation component can simulate various magnetic field environments [1]. Description of the Drawings

[0014] The drawings are used to provide a further understanding of the present invention and form a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the drawings: Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the schematic diagram of the carrier vehicle mechanism of the present invention; Figure 3a Figure 3b Figure 3c Figure 4 Figure 5a Figure 5b Figure 5c is the coil layout diagram of the present invention; Figure 6a Figure 6b Figure 6c is the magnetic field simulation schematic diagram of the present invention; Figure 7 is the schematic diagram of the lateral, longitudinal, and vertical magnetic field distributions on the central axis of the present invention; Figure 8 is the schematic diagram of the sleeper component structure of the present invention; Figure 9 is the partial structural schematic diagram of the present invention; Figure 10 is the schematic diagram of the installation position of the speed measurement component of the present invention.

[0015] In the figure: 1. Bearing foundation; 11. Rail; 12. Sleeper assembly; 121. Support column; 122. Transverse tensile beam; 123. Diagonal brace; 13. Carrier vehicle; 14. Unmanned ship; 15. Clamping assembly; 151. Hydraulic telescopic arm; 152. Arc-shaped gripper; 16. First stop block; 2. Measuring assembly; 3. Magnetic field simulation assembly; 31. Coil; 4. Power assembly; 41. Electric winch; 42. Pulley; 43. Cable; 5. Control assembly; 6. Detection column; 7. Limit switch; 8. Speed measurement assembly; 81. Laser emitter; 82. Laser receiver; 9. Second stop block. Detailed implementation mode

[0016] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not intended to limit the present invention.

[0017] All the same reference numerals in the accompanying drawings refer to the same components.

[0018] As Figures 1-10 As shown, the present invention provides a magnetic field testing device, including a bearing foundation 1, a measuring assembly 2, a magnetic field simulation assembly 3, a power assembly 4 and a control assembly 5. The magnetic field simulation assembly 3 and the power assembly 4 are fixed above the bearing foundation 1. The measuring assembly 2 is arranged on the bearing foundation 1. The control assembly 5 is connected to and controls the magnetic field simulation assembly 3, the measuring assembly 2 and the power assembly 4. When an object passes through the magnetic field simulated by the magnetic field simulation assembly 3, the measuring assembly 2 collects magnetic field information.

[0019] In the present invention, the power assembly 4, the magnetic field simulation assembly 3 and the measuring assembly 2 are controlled remotely or by a fixed line through the control assembly 5: the power assembly 4 drives the carrier vehicle 13 and the unmanned ship 14 thereon to move forward along a predetermined route; the magnetic field simulation assembly 3 generates a magnetic field; the measuring assembly 2 detects and displays the magnetic field information when the carrier vehicle 13 and the unmanned ship 14 above it pass by.

[0020] In an alternative embodiment, the bearing foundation 1 adopts a wooden structure. Two rails 11 are arranged above the bearing foundation 1. The rails 11 are arranged in parallel on the bearing foundation 1. A sleeper assembly 12 is also arranged above the bearing foundation 1. The sleeper assembly 12 is arranged between the rails 11 and the bearing foundation 1. A carrier vehicle 13 is arranged above the rails 11. An unmanned ship 14 is detachably connected above the carrier vehicle 13. Clamping assemblies 15 are symmetrically arranged on the left and right sides of the carrier vehicle 13 to fix the unmanned ship 14. The clamping assembly 15 includes a hydraulic telescopic arm 151 and an arc-shaped gripper 152. The arc-shaped gripper 152 contacts the outer surface of the unmanned ship 14. First stop blocks 16 are symmetrically arranged on the front and rear sides of the carrier vehicle 13.

[0021] It should be noted that the bearing base 1 is made of wood, which can effectively reduce the weight of the magnetic field testing device. When the magnetic field environment interference in the testing site is large, the magnetic field testing device can be transported to a site with a better magnetic field environment by a trailer or a towing device. And this light and transportable property enables the separation of the production place and the use place of the magnetic field testing device, having higher commercial value. [2] The wheels of the carrier vehicle 13 are made of cast steel. The wheel diameter is determined according to the load-bearing weight of the carrier vehicle 13 and the track specifications, generally not less than 100 mm. The wheel tread needs to be quenched to improve its hardness and wear resistance. Bearings are installed inside the wheels to ensure flexible rotation and reduce the running resistance. Each wheel of the carrier vehicle 13 is installed on the wheel frame through a wheel axle, and the wheel frame is connected to the frame of the carrier vehicle 13 by bolt connection or welding connection. In order to ensure the smooth running of the carrier vehicle 13 on the track, double-flange wheels are used, and the flange height is not less than 200 mm, which can effectively prevent the carrier vehicle 13 from derailing. At the same time, a braking device is installed on the wheel set so that the carrier vehicle 13 can be stopped when needed. The braking device can adopt an electromagnetic brake or a hydraulic brake, and the braking ability should meet the braking requirements of the carrier vehicle 13 under full load conditions.

[0022] It should be noted that rubber or polyurethane buffer materials are pasted on the surface of the carrier vehicle 13 to effectively prevent scratches or abrasions on the bottom of the unmanned ship 14 during handling. By setting high-strength bolt holes at the key structural parts of the bottom of the unmanned ship 14, the unmanned ship 14 is tightly connected to the carrier vehicle 13 by special high-strength stainless steel bolts. The specifications, quantities and distributions of the bolts are determined by mechanical analysis based on the structural characteristics and the center of gravity position of the unmanned ship 14 to ensure the firmness and uniformity of the fixation and be able to withstand the external forces under various working conditions. The hydraulic cylinder is powered by a hydraulic pump station and can accurately control the magnitude of the clamping force and the clamping stroke. The clamping arm is made of high-strength aluminum alloy, and the contact part with the unmanned ship 14 is covered with a rubber protective sleeve to avoid scratching the surface of the unmanned ship 14. The designed clamping force of the clamping mechanism should be greater than the lateral force received by the unmanned ship 14 during the operation of the carrier vehicle 13 to ensure the stability of the unmanned ship 14 in the lateral direction. The clamping mechanism should also have a pressure monitoring function to monitor the magnitude of the clamping force in real time. When the clamping force is lower than the set value, an alarm is sent out in time and adjustments are made. The first stop block 16 is welded by steel structure, and its shape is adapted to the end contour of the unmanned ship 14. The first stop block 16 is firmly fixed to the carrier vehicle 13 by bolt connection or welding, and can effectively withstand the inertial forces in the front and back directions generated during the start-up and braking of the unmanned ship 14, preventing the unmanned ship 14 from having an axial displacement out of the carrier vehicle 13. A rubber buffer pad is installed between the first stop block 16 and the end of the unmanned ship 14 to further reduce the impact on the unmanned ship 14 and protect the structural integrity of the unmanned ship 14. In an alternative embodiment, the casting length of the bearing foundation 1 is 50 m, the width is 6 m, and the thickness is not less than 100 mm. The rail 11 is a heavy rail 11 made of 20Mn23AlV non-magnetic steel. The sleeper assembly 12 includes longitudinal support columns 121 and transverse tensile beams 122. The longitudinal support columns 121 are arranged below the rail 11, and the two longitudinal support columns 121 are fixedly connected by the transverse tensile beam 122. The sleeper assembly 12 further includes a diagonal brace 123. The diagonal brace 123 is obliquely arranged between the longitudinal support column 121 and the transverse tensile beam 122, with one end fixedly connected to the upper end of the longitudinal support column 121 and the other end fixedly connected to the transverse tensile beam 122. A detection column 6 is arranged at the top of the longitudinal support column 121.

[0023] It should be noted that the heavy rail 11 adopts a two-stage rolling production process, and its relative magnetic permeability can reach 1.008 or lower under a magnetic field intensity of 16 kA / m. It has excellent properties such as a yield strength of 355 - 470 MPa, a tensile strength of 610 - 690 MPa, an elongation of 40 - 60%, and an impact energy of more than 200 J at -196 °C, and can bear the weights of the carrier vehicle 13 and the unmanned ship 14. The track is fixed to the track foundation through track pressing plates and bolts. The track spacing is designed according to the wheelbase of the carrier vehicle 13 to ensure the smooth operation of the carrier vehicle 13 without derailment. When installing the track, it is necessary to ensure that the straightness error does not exceed ±5 mm, and the elevation error of the rail top is controlled within ±5 mm. A set of brackets is arranged every 5 m along the track; the longitudinal support column 121 is cast with a reinforced (20Mn23AlV) concrete structure, and the bottom is firmly connected to the bearing foundation 1 through anchor bolts, and the top is welded to the cross beam. The transverse tensile beam 122 is made of 20Mn23AlV section steel, which is used to support the track and transfer the load of the carrier vehicle 13. The diagonal brace 123 is made of angle steel or steel pipe to enhance the stability and lateral force resistance of the sleeper assembly 12.

[0024] In an alternative embodiment, the power assembly 4 includes an electric winch 41. The electric winch 41 is arranged at the upper right end of the bearing foundation 1. The power assembly 4 further includes a pulley 42. The pulley 42 is arranged at the upper left end of the bearing foundation 1. A cable 43 is connected between the electric winch 41 and the pulley 42. The cable 43 is fixedly connected to the carrier vehicle 13 and drags the carrier vehicle 13 to move and brake.

[0025] It should be noted that the cable 43 is connected to the carrier vehicle 13 through a hook. An electric winch 41 with an appropriate power and traction force is selected according to the total weight of the unmanned ship 14 and the carrier vehicle 13 and the track friction force. The winch should have a sufficient speed regulation range to accurately control the running speed of the carrier vehicle 13. The speed regulation method can adopt variable frequency speed regulation or resistance speed regulation. At the same time, the winch should be equipped with safety devices such as an overload protection device and a limit switch 7 to ensure that no accidents occur due to overload or over-travel during operation.

[0026] A system that drives the electric winch 41 through a frequency converter to accurately control the retracting and releasing speed of the cable 43, and then drags the multi-wheel carrier vehicle 13 carrying the unmanned ship 14 of a specific specification to move forward and backward smoothly on the horizontal track. This system involves the selection and design of multiple key components, including the electric winch 41, the cable 43, the winch drum, the frequency converter, the pulley 42, the horizontal track, the carrier vehicle 13, etc. At the same time, it is also necessary to consider the fixing method of the unmanned ship 14 on the carrier vehicle 13 and the overall layout and design considerations to ensure that the system can operate safely, efficiently and stably.

[0027] 1) Requirements for running speed and acceleration: The carrier vehicle 13 needs to run at a low speed of about 0.1 m / s to ensure smooth transportation and facilitate precise control. The acceleration and deceleration are set to 0.05 m / s², which can not only meet the smooth transition of starting and stopping, but also meet the low tolerance requirements of large-scale precision equipment such as the unmanned ship 14 for dynamic impact.

[0028] 2) Load characteristics: The unmanned ship 14 is 20 meters long, 2.9 meters in diameter, 3.22 meters high, and weighs 45 tons. During transportation, various resistances such as rolling friction and wind resistance need to be overcome. The design of each component of the system must fully consider the strict requirements of carrying and driving this load.

[0029] Power calculation of the electric winch 41 1) Analysis of running resistance Rolling friction: The rolling friction between the multiple wheels of the carrier vehicle 13 and the horizontal track is the basic resistance. Assuming the wheel diameter is D (unit: m) and the rolling friction coefficient is μ 1 (obtained through experiments or manuals according to the material combination of the wheels of the carrier vehicle 13 and the non-magnetic aluminum alloy track, and the estimated value range is 0.03 - 0.08), then the rolling friction force F 1 = μ 1 ×G, where G = 45×10³×9.8 N (gravity).

[0030] Wind resistance: The unmanned ship 14 is hindered by the wind force during movement in the air. According to the wind resistance calculation formula F 2 = 0.5×ρ×C ×A×V², where ρ is the air density (about 1.29 kg / m³ at normal temperature and pressure), C is the drag coefficient (estimated to be 0.6 - 1.0 depending on the streamline of the unmanned boat's shape), A is the windward area (about 20×2.9 = 58 m²), and V is the running speed of 0.1 m / s.

[0031] Inertial force: During the starting acceleration and deceleration braking phases, the inertial force cannot be ignored. According to Newton's second law, F 3 = m×a, where m = 45×10³ kg and a = 0.05 m / s².

[0032] 2) Total resistance and power calculation The total running resistance F = F 1 + F 2 + F 3 . Considering a certain safety factor k (taking 1.2 - 1.5), the power of a single electric winch 41 is P = (F×V) / (2×η), where η is the transmission efficiency (including the winch drum, bearings, etc., estimated to be 0.8 - 0.9). After detailed numerical substitution and calculation, a motor with a suitable power is selected (preliminary estimate: the power of a single motor is about 7.5 - 12 kW, and it is finally determined according to accurate parameters and working conditions), and motors with characteristics such as high efficiency, energy saving, low speed, and high torque, such as permanent magnet synchronous motors, are preferred.

[0033] The following are the calculation steps: Electric power calculation of electric winch 41 1. Calculate the running resistance of carrier vehicle 13: The formula for rolling friction is , where is the rolling friction coefficient. For the combination of a non-magnetic aluminum alloy track and non-magnetic wheels, takes a value of 0.03 - 0.08; is the total mass of carrier vehicle 13 and unmanned boat 14, (assuming of the mass of carrier vehicle 13, then ), is the acceleration due to gravity, , then the rolling friction .

[0034] Air resistance: The formula for air resistance is , where is the air resistance coefficient. For the shape of unmanned boat 14, ; is the windward area of unmanned boat 14, ; is the air density. Under standard atmospheric pressure, ; is the driving speed of the carrier vehicle 13, and the maximum driving speed . Then the determined air resistance .

[0035] Starting and braking inertia forces: Starting acceleration , starting inertia force ; Braking acceleration , braking inertia force (The negative sign indicates that the direction is opposite to the direction of motion).

[0036] Total resistance (at start): , then .

[0037] Total resistance (during operation): .

[0038]

[0039] 2. Calculate the power of the electric winch 41 Starting power (single-axis motor): According to the formula , then , considering the efficiency of the motor Generally taken as 0.8 - 0.9, the overload factor during start (generally taken as 1 - 2) and the situation of two vehicles working together, the rated power of the motor and 36267.65W, the rated power of the motor .

[0040] Running power (single-axis motor): According to the formula , then , considering the efficiency of the school bus Generally taken as 0.8 - 0.9, the rated power during movement and 37009.765W, the rated power of the motor . Braking power (single motor): According to the power formula then = 36709.765x0.1 = 3670.9765 3.67kW. Considering the efficiency of the motor Generally taken as 0.8 - 0.9, the electric energy that can be recovered during braking (i.e., saving electric energy) accounts for 0.3 - 0.5 of the total power generation. Also, because two motors work simultaneously, the rated power of the motor - (Here, considering the special situation during braking, K is taken as 1 - 1.2), assuming η = 0.85, K = 1.1, then .67 = 2.34KW Considering the braking process, in order to ensure that the motor can meet the load requirements, the power of each electric winch 41 can be selected as a value of about 7.5 - 11 kW; Strength requirements of the cable 43: The maximum tensile force borne by the cable 43 appears in the working conditions of starting, accelerating, braking and high-speed shifting of the carrier. At the start, considering the influence of inertia force, the maximum tensile force , where , then .

[0041] According to the safety factor calculation, for such traditional Chinese medicine handling operations, the safety factor of the cable 43 is taken as Take 6 , then the maximum breaking force of the cable 43 for carrying .

[0042] Select the material and specification of the cable 43: In view of the fact that the cable 43 needs to be a non-magnetic material, high-strength non-magnetic stainless steel cable 43 or high-performance aramid fiber cable 43 can be selected. For the non-magnetic stainless steel cable 43, the diameter of the cable 43 is 16 22 mm specification, and its tensile strength can meet the above requirements; for the aramid fiber cable 43, a diameter of 12 18 mm specification can be selected. At the same time, it is necessary to comprehensively consider the flexibility, corrosion resistance and fatigue resistance of the cable 43 so that it can maintain good elasticity during long-term work. For example: select a stainless steel cable 43 with a diameter of 18 mm, and its breaking tensile force can reach more than 450,000 N, meeting the system safety and having good comprehensive performance. In addition, the joint part of the cable 43 should adopt a welding process, such as using high-strength welding for the steel rope connection, ensuring that the strength of the joint is not lower than the strength of the cable 43 body, and avoiding breakage during use. In an alternative embodiment, the control component 5 sends a magnetic field simulation instruction to the magnetic field simulation component 3 and sends a magnetic field measurement instruction to the measurement component 2. The measurement component 2 is arranged on the detection column 6. The measurement component 2 uses a fluxgate sensor and collects, displays, analyzes, stores, exports and manages magnetic field information. The acquisition function includes acquisition frequency setting and acquisition start-stop control. The analysis includes data display, time-domain waveform display and spectrum analysis. The data management includes data storage, data export and report generation. The measurement component 2 is made of non-magnetic aluminum alloy material.

[0043] It should be noted that the measuring component 2 is made of a specific brand of non-magnetic aluminum alloy (such as 5083, 6061, etc.). Due to its good non-magnetic properties, it fits the electromagnetic sensitive environment. Compared with steel, it has a lower density (about 2.7 g / cm³, while steel is 7.8 g / cm³), which reduces its own weight and facilitates installation. Although its strength is slightly inferior, through reasonable structural design, it can meet the load-bearing requirements. Moreover, it has excellent corrosion resistance, which can extend the life of the track and reduce the maintenance cost. The laser sensor is used to monitor the position and running speed of the trolley in real time. The laser sensor adopts the principle of high-precision laser ranging. It emits a laser beam that irradiates on the reflector on the trolley, and calculates the distance between the trolley and the sensor by measuring the round-trip time of the laser, and then estimates the position and speed of the trolley. The measurement accuracy of the laser sensor should reach within ±1 mm, and the measurement speed range is 0 - 0.5 m / s, which can meet the high-precision requirements of the system for monitoring the position and speed of the trolley. The data of the laser sensor is transmitted to the control system through a communication cable, providing real-time data support for the operation control and fault diagnosis of the system. At key positions of the track, such as bends, grade change points, etc., the layout density of the laser sensors can be appropriately increased to more accurately monitor the running state of the trolley at these special positions. At the same time, the laser sensor should have an automatic calibration function to regularly calibrate the measurement accuracy to ensure the accuracy of the data.

[0044] In an alternative embodiment, the main body of the magnetic field simulation component 3 is composed of a coil 31. The coil 31 is arranged around the rail 11. The size of the uniform area of the coil 31 is φ3×20m, and the uniformity is greater than 90%. The magnetic field intensity it simulates is: 100 μT vertically, 70 μT longitudinally and transversely respectively.

[0045] It should be noted that the overall framework of the coil 31 is as Figure 3a shown, and it is mainly composed of the coil 31 windings in three directions. The axial winding is as Figure 3b shown, and the coil 31 windings in the front-back and left-right directions are as Figure 3c shown. The detailed structure of the axial coil 31 is as Figure 4 shown. Figure 3b In Figure 4 , the axial winding is formed by translating two coils 31 along the Z-axis by 3.3 m, and a total of nine Figure 4 shown coils 31 are included. Therefore, Figure 3b a total of 18 coils 31 are included. From the center point of the magnetic field region, that is, the Figure 3b shown coordinate origin along the axis direction, the total current of a single coil 31 is 160 A, 160 A, 160 A, 160 A, and 200 A in sequence. Using a single-turn current of 40 A, the number of turns is 4 turns, 4 turns, 4 turns, 4 turns, and 5 turns in sequence. Therefore, a total of 14 coils 31 with a size of 6.7 m * 6.7 m and 4 turns are required, and 4 coils 31 with a size of 6.7 m * 6.7 m and 5 turns are required. The coil 31 windings in the front-back and left-right directionsFigure 3c Composed of Figure 5a and Figure 5b . The middle coil 31 in Figure 5a is formed by translating four coils 31 in Figure 5c along the Z-axis by 2.5 m, including nine coils 31 shown in Figure 5a . Therefore, Figure 5a it contains a total of 36 coils 31. From the center point of the magnetic field region, that is, Figure 5a the origin of coordinates shown in

[0046] Table 1 Number table of various types of coils 31

[0047] The simulation results are as shown in Figures 6a-6c . The transverse, longitudinal and vertical magnetic fields at the center point of the Φ3×20 m cylinder are 84.1 μT, 84.2 μT and 117.7 μT respectively. Figure 7 It is the transverse, longitudinal and vertical magnetic field distributions on the central axis of the Φ3×20 m cylinder. The unit of the magnetic field on the vertical coordinate is T. The calculation results show that the magnetic field uniformity in all three directions is higher than 92%. In an optional embodiment, a limit switch 7 and a speed measurement component 8 are arranged on the side of the detection column 6. The limit switch 7 is electrically connected to the power component 4. After the carrier vehicle 13 passes the limit switch 7, the power component 4 stops operating. The speed measurement component 8 includes a laser emitter 81 and a laser receiver 82, which are respectively arranged on two symmetric detection columns 6.

[0048] It should be noted that the limit switch 7 can be a mechanical travel switch or a non-contact inductive switch. The mechanical travel switch is installed on the bracket at the end of the track. When the carrier vehicle 13 runs close to the end of the track, the collision block of the carrier vehicle 13 triggers the travel switch, causing the electric hoist 41 to stop running immediately and preventing the carrier vehicle 13 from derailing. The non-contact inductive switch, such as a proximity switch or an optoelectronic switch, detects the position of the carrier vehicle 13 by sensing the metal components of the carrier vehicle 13 or reflecting light. Its advantages are no mechanical wear, long service life, and high detection accuracy. The action accuracy of the limit switch 7 should be controlled within ±5 mm to ensure that the carrier vehicle 13 can stop accurately within a safe range. To improve the reliability of the limit switch 7, a redundant design can be adopted, that is, two limit switches 7 are installed at both ends of the track, namely the primary limit switch 7 and the secondary limit switch 7. When the primary limit switch 7 fails, the secondary limit switch 7 can play a role in time to further ensure the safety of the system. The speed measurement component 8 is used to monitor the position and running speed of the trolley in real time. The laser sensor adopts the principle of high-precision laser ranging, emits a laser beam that irradiates on the laser receiver 82, and calculates the position and speed of the trolley by measuring the time when the laser is blocked by the carrier vehicle 13. The measurement accuracy of the laser sensor should reach within ±1 mm, and the measurement speed range is 0 - 0.5 m / s, which can meet the high-precision requirements of the system for monitoring the position and speed of the trolley. The data of the speed measurement component 8 is transmitted to the control system through a communication cable, providing real-time data support for the operation control and fault diagnosis of the system. At key positions of the track, such as curves and slope change points, the layout density of the laser sensors can be appropriately increased to more accurately monitor the running state of the trolley at these special positions. At the same time, the laser sensor should have an automatic calibration function to calibrate the measurement accuracy regularly to ensure the accuracy of the data.

[0049] In an optional embodiment, a second blocking block 9 is provided above the end of the steel rail 11 in the direction of the magnetic field simulation component 3.

[0050] It should be noted that the second blocking block 9 can be a hydraulic buffer or a rubber buffer block. Its buffering capacity should be calculated and determined according to the maximum running speed and mass of the carrier vehicle 13 to ensure that it can effectively absorb the kinetic energy of the carrier vehicle 13, make the carrier vehicle 13 stop smoothly, and avoid damage to the bracket structure and the unmanned ship 14.

[0051] The working principle of the present invention is as follows: First, the unmanned ship 14 is fixed for operation. The hydraulic telescopic arm 151 is adjusted to make the arc-shaped gripper 152 contact the unmanned ship. Subsequently, the control component 5 is operated to control the power component 4, the magnetic field simulation component 3, and the measurement component 2: The magnetic field simulation component 3 is controlled to generate a magnetic field. Subsequently, the power component 4 drives the carrier vehicle 13 and the unmanned ship 14 thereon to move forward along the rail 11. When the unmanned ship 14 passes through the magnetic field, the measurement component 2 detects and displays the magnetic field information when the carrier vehicle 13 and the unmanned ship 14 above it pass by, and the speed measurement component 8 detects the speed when the unmanned ship 14 passes by.

[0052] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A magnetic field testing device, characterized in that: The invention comprises a bearing base (1), a measuring component (2), a magnetic field simulation component (3), a power component (4) and a control component (5); the magnetic field simulation component (3) and the power component (4) are fixed above the bearing base (1); the measuring component (2) is arranged on the bearing base (1); the control component (5) connects and controls the magnetic field simulation component (3), the measuring component (2) and the power component (4); when an object passes through the magnetic field simulated by the magnetic field simulation component (3), the measuring component (2) collects magnetic field information.

2. A magnetic field testing device according to claim 1, characterized in that: The bearing base (1) is of a wooden structure. Two steel rails (11) are arranged above the bearing base (1). The steel rails (11) are arranged in parallel on the bearing base (1). A sleeper assembly (12) is also arranged above the bearing base (1). The sleeper assembly (12) is arranged between the steel rails (11) and the bearing base (1). A carrier (13) is arranged above the steel rails (11). An unmanned boat (14) is detachably connected to the carrier (13). Clamping assemblies (15) are symmetrically arranged on left and right sides of the carrier (13) for fixing the unmanned boat (14). The clamping assembly (15) comprises a hydraulic telescopic arm (151) and an arc-shaped gripper (152). The arc-shaped gripper (152) contacts the outer surface of the unmanned boat (14). First blocking blocks (16) are symmetrically arranged on front and rear sides of the carrier (13).

3. A magnetic field testing device according to claim 2, characterized in that: The bearing foundation (1) has a casting length of 50 meters, a width of 6 meters, and a thickness of less than 100 mm. The steel rail (11) is a heavy steel rail (11) made of 20Mn23A1V non-magnetic steel. The sleeper assembly (12) comprises a longitudinal support column (121) and a transverse tensile beam (122). The longitudinal support column (121) is arranged below the steel rail (11). Two longitudinal support columns (121) are fixedly connected via the transverse tensile beam (122). The sleeper assembly (12) further comprises an oblique brace (123). The oblique brace (123) is obliquely arranged between the longitudinal support column (121) and the transverse tensile beam (122), one end of which is fixedly connected to the upper end of the longitudinal support column (121), and the other end of which is fixedly connected to the transverse tensile beam (122). A detection column (6) is arranged at the top of the longitudinal support column (121).

4. A magnetic field testing device according to claim 1, characterized in that: The power assembly (4) comprises an electric winch (41), the electric winch (41) being arranged at the upper right end of the bearing base (1), the power assembly (4) further comprises a pulley (42), the pulley (42) being arranged at the upper left end of the bearing base (1), a cable (43) being connected between the electric winch (41) and the pulley (42), the cable (43) being fixedly connected to the carrier (13) and dragging the carrier (13) to move and brake.

5. A magnetic field testing device according to claim 3, characterized in that: The control component (5) sends a magnetic field simulation instruction to the magnetic field simulation component (3) and sends a magnetic field measurement instruction to the measurement component (2). The measurement component (2) is arranged on the detection column (6). The measurement component (2) adopts a fluxgate sensor and collects, displays, analyzes, stores, exports and manages data of magnetic field information. The collection function includes collection frequency setting and collection start and stop control. The analysis includes data display, time domain waveform display and spectrum analysis. The data management includes data storage, data export and report generation. The measurement component (2) is made of non-magnetic aluminum alloy.

6. A magnetic field testing device according to claim 1, characterized in that: The main body of the magnetic field simulation component (3) is composed of a coil (31), and the coil (31) is arranged around the rail (11). The uniform area size of the coil (31) is φ3×20m, and the uniformity is greater than 90%. The simulated magnetic field intensity is: 100μT vertically, and 70μT longitudinally and transversely.

7. A magnetic field testing device according to claim 3, characterized in that: A limit switch (7) and a speed measuring assembly (8) are arranged on the side of the detection column (6); the limit switch (7) is connected to the power assembly (4) in an electric circuit; when the carrier (13) passes the limit switch (7), the power assembly (4) stops running; the speed measuring assembly (8) comprises a laser transmitter (81) and a laser receiver (82), which are respectively arranged on two symmetrical detection columns (6).

8. A magnetic field testing device according to claim 2, characterized in that: A second blocking block (9) is provided above the end of the steel rail (11) located in the direction of the magnetic field simulation component (3).

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