RFID identification anti-interference method and device for hot-metal bottle

Abstract

The invention discloses a hot-metal bottle RFID identification anti-interference method and device, and the method comprises the steps: building a three-dimensional geometric model which comprises a shielding net, a rail weighbridge and a hot-metal bottle based on FDTD electromagnetic simulation, and carrying out the simulation verification according to the built three-dimensional geometric model; according to the verified three-dimensional geometric model, shielding nets are arranged on the two sides of the rail weighbridge to form a physical shielding space, and each shielding net comprises a supporting assembly and a composite shielding net assembly; when it is detected that the monorail vehicle passes through the RFID identification host, RFID data on the vehicle are read, and non-molten iron tank RFID signals are filtered through a prefix verification algorithm; and when detecting that the double-track vehicle synchronously passes, capturing the time stamp of the RFID data on the double-track vehicle, calculating the arrival time difference of the RFID signals of the double-track vehicle, and eliminating cross interference signals according to the calculated time difference. The multi-dimensional shielding effect is achieved, the double-track crosstalk rate is reduced to be smaller than or equal to 3.2% from 87%, the tank number recognition accuracy is larger than or equal to 99.99%, external RFID interference is shielded completely, and the problem of multi-source signal interference in a factory area is thoroughly solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of intelligent molten iron metering in the metallurgical industry, and particularly relates to a molten iron ladle RFID identification anti-interference method and device. BACKGROUND

[0002] In a modern steel production process, dynamic and accurate metering of molten iron is a core link of intelligent production management, cost accounting and quality tracing. The traditional static metering method needs to stop the molten iron ladle car for weighing, resulting in a single ladle metering time of more than 60 seconds and low production efficiency. Although the dynamic molten iron metering technology can realize real-time metering at a speed of 5 km / h, it still faces the challenge of special electromagnetic interference in engineering application.

[0003] Multi-track signal reflection coupling: Because the internal railway of a steel enterprise is often a curved line, two track scales are often arranged along adjacent parallel molten iron lines (center distance ≤10 meters). When two molten iron ladle cars are metered synchronously, the mirror reflection formed on the surface of the molten iron ladle metal will cause RFID signal crosstalk, and the actual measured crosstalk rate is as high as 87%, resulting in weight and ladle number matching errors.

[0004] Multi-source RFID signal interference: The signal radiation of electronic tags such as automobile RFID and logistics RFID within a range of 30 meters in the factory area will cause the misreading rate of the molten iron ladle RFID system to exceed 12%. SUMMARY

[0005] The application aims at the problems existing in the prior art and provides a molten iron ladle RFID identification anti-interference method and device.

[0006] Based on the specification, the application provides a molten iron ladle RFID identification anti-interference method, which comprises the following steps:

[0007] Based on FDTD electromagnetic simulation, a three-dimensional geometric model containing a shielding net, a track scale and a molten iron ladle is established, and simulation verification is performed according to the established three-dimensional geometric model.

[0008] According to the verified three-dimensional geometric model, the shielding net is arranged on both sides of the track scale to form a physical shielding space, and the shielding net comprises a support assembly and a composite shielding net assembly.

[0009] When a single-track vehicle is detected to enter the physical shielding space, RFID data on the vehicle is read, and a prefix verification algorithm is used to filter non-molten iron ladle RFID signals.

[0010] When double-track vehicles are detected to synchronously enter the physical shielding space, the time stamps of the RFID data on the double-track vehicles are captured respectively, the time difference of the RFID signals of the double-track vehicles is calculated, and the cross interference signals are removed according to the calculated time difference.

[0011] As a further technical solution, based on FDTD electromagnetic simulation, a three-dimensional geometric model containing a shielding net, a track scale and a molten iron tank is established, and simulation verification is carried out according to the constructed three-dimensional geometric model, including:

[0012] Based on the installation height of the electronic tag on the molten iron tank, the ground clearance of the bottom of the shielding net and the safety margin, the height of the shielding net is determined;

[0013] Based on the actual layout of the track scale, according to the determined height of the shielding net, a three-dimensional spatial geometric model containing the shielding net, the track scale and the molten iron tank is constructed;

[0014] Based on FDTD electromagnetic simulation, it is verified whether the RFID signal attenuation of the molten iron tank meets the requirements;

[0015] According to the verification result, the shielding net is adjusted until the RFID signal attenuation of the molten iron tank meets the requirements.

[0016] As a further technical solution, the height of the shielding net satisfies H≥h_{tag}-h_{off ground}+safety margin;

[0017] Wherein, H is the height of the shielding net, h_{tag} is the installation height of the electronic tag on the molten iron tank, and h_{off ground} is the distance between the bottom of the shielding net and the ground.

[0018] As a further technical solution, verifying whether the RFID signal attenuation meets the requirements includes:

[0019] Input copper mesh parameters and into the following attenuation formula:

[0020] ,

[0021] Wherein, A is the attenuation, d is the mesh diameter, and λ is the signal wavelength;

[0022] Verify whether the attenuation of the copper mesh with the target mesh number under the target radio frequency signal is not lower than the standard amount.

[0023] As a further technical solution, non-molten iron tank RFID signals are filtered through a prefix verification algorithm, including:

[0024] Real-time analysis of RFID data, comparing the actual prefix in the RFID data with the fixed prefix of the RFID tag on the molten iron tank, if they do not match, filter the signal, and trigger a three-level filtering mechanism.

[0025] As a further technical solution, according to the calculated time difference, the cross interference signal is removed, including:

[0026] Compare the calculated time difference with the standard time:

[0027] If the time difference is less than the standard time, the cross interference signal is determined and eliminated;

[0028] If the time difference is not less than the standard time, the effective signal is determined and tank number matching is performed.

[0029] Based on the specification, one aspect of the present application provides a molten iron tank RFID identification anti-interference device, comprising:

[0030] The composite shielding net assembly is arranged on both sides of the rail weighbridge through the support assembly, and the height of the bottom of the composite shielding net assembly from the ground is controlled at a predetermined height to realize physical layer signal shielding;

[0031] The RFID identification host is arranged between the composite shielding net assembly and the rail weighbridge, and is used for reading the RFID data on the vehicle when detecting that the single-track vehicle passes through the RFID identification host, and filtering the non-molten iron tank RFID signal based on the signal filtering algorithm of the RFID data prefix verification.

[0032] As a further technical solution, the composite shielding net assembly comprises an inner layer made of stainless steel wire mesh, a middle layer made of electrolytic copper mesh, and an outer layer made of oxidation-resistant coated copper mesh.

[0033] As a further technical solution, the support assembly comprises flagpoles arranged at equal intervals, and the bottom of the flagpoles is poured with a concrete foundation, and a laser range finder and an inclination sensor are arranged on the flagpoles.

[0034] As a further technical solution, the RFID identification host is also used for capturing the time stamp of the RFID data on the double-track vehicle when detecting that the double-track vehicle passes through the RFID identification host synchronously, calculating the time difference of the RFID signal arrival of the double-track vehicle, and eliminating the cross interference signal according to the calculated time difference.

[0035] Compared with the prior art, the present application has the following beneficial effects:

[0036] 1. The composite shielding net + prefix verification / time difference algorithm synergistic effect realizes multi-dimensional shielding effect, reduces the double-track crosstalk rate from 87% to ≤3.2%, the tank number identification accuracy is ≥99.99%, the external RFID interference is 100% shielded, and the problem of factory multi-source signal interference is completely solved.

[0037] 2. The modular support structure (flagpole + concrete foundation) realizes short-time rapid disassembly and assembly, greatly improves the construction efficiency, greatly improves the weather resistance of the three-layer composite shielding net, makes the annual maintenance cost close to 0, and saves a large amount of maintenance cost;

[0038] 3. Laser ranging / inclination sensor real-time monitoring shield net pose, greatly reduce the deviation, ensure long-term shielding effectiveness. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 A molten iron tank RFID identification anti-interference method flow chart is provided for the embodiment of the application.

[0040] Figure 2 An explosive structural schematic diagram of a composite shielding net assembly is provided for the embodiment of the application.

[0041] Figure 3 A support assembly structural schematic diagram is provided for the embodiment of the application.

[0042] In the figure: 1, concrete foundation; 2, connecting column; 3, flagpole; 4, net hanging seat; 5, support ring seat; 6, connecting sleeve; 7, ear plate; 8, laser range finder; 9, inclination sensor; 10, composite shielding net assembly; 101, inner layer; 102, middle layer; 103, outer layer. DETAILED DESCRIPTION

[0043] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0044] In the description of the present application, it should be noted that the terms "intermediate", "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application.

[0045] As shown in Figure 1 One aspect of the present application provides a molten iron tank RFID identification anti-interference method, comprising:

[0046] Based on FDTD electromagnetic simulation, a three-dimensional geometric model containing a shielding net, a track scale and a molten iron tank is established, and simulation verification is performed according to the established three-dimensional geometric model;

[0047] According to the verified three-dimensional geometric model, the shielding net is arranged on both sides of the track scale to form a physical shielding space, and the shielding net comprises a support assembly and a composite shielding net assembly;

[0048] When a monorail vehicle is detected to have entered the physically shielded space, the RFID data on the vehicle is read, and the RFID signals of non-iron molten steel tanks are filtered out by a prefix check algorithm.

[0049] When the dual-rail vehicles are detected to enter the physical shielded space simultaneously, the timestamps of the RFID data on the dual-rail vehicles are captured respectively, the time difference of arrival of the RFID signals of the dual-rail vehicles is calculated, and cross-interference signals are eliminated based on the calculated time difference.

[0050] In this embodiment, a three-dimensional geometric model including a shielding mesh, a track scale, and a molten iron ladle is established based on FDTD electromagnetic simulation. Simulation verification is then performed based on the constructed three-dimensional geometric model, including:

[0051] The height of the shielding mesh is determined based on the installation height of the electronic tag on the molten iron ladle, the ground clearance of the bottom of the shielding mesh, and the safety margin.

[0052] Based on the actual layout of the track scale, and according to the determined height of the shielding net, a three-dimensional spatial geometric model including the shielding net, the track scale, and the molten iron ladle is constructed.

[0053] Based on FDTD electromagnetic simulation, it was verified whether the attenuation of the RFID signal on the molten iron ladle met the requirements.

[0054] Adjust the shielding mesh according to the verification results until the RFID signal attenuation on the molten iron ladle meets the requirements.

[0055] In this embodiment, the height of the shielding mesh satisfies H≥h_{label}-h_{ground clearance}+safety margin;

[0056] Where H is the height of the shielding mesh, h_{tag} is the installation height of the electronic tag on the molten iron ladle, and h_{distance from the ground} is the distance between the bottom of the shielding mesh and the ground.

[0057] In this embodiment, verifying whether the RFID signal attenuation meets the requirements includes:

[0058] Input the copper mesh parameters and substitute them into the following attenuation formula:

[0059] ,

[0060] Where A is the attenuation, d is the mesh diameter, and λ is the signal wavelength;

[0061] Verify whether the attenuation of the target radio frequency signal by the copper mesh with the target mesh count is not lower than the standard amount.

[0062] In this embodiment, filtering non-iron can RFID signals using a prefix check algorithm includes:

[0063] The system analyzes 46-bit RFID data in real time, compares the actual prefix in the RFID data with the fixed prefix of the RFID tag on the molten iron ladle, and filters the signal if they do not match, triggering a three-level filtering mechanism.

[0064] In this embodiment, the process of eliminating cross-interference signals based on the calculated time difference includes:

[0065] Compare the calculated time difference with the standard time:

[0066] If the time difference is less than the standard time, it is judged as a cross-interference signal and is eliminated.

[0067] If the time difference is not lower than the standard time, it is considered a valid signal and tank number matching is performed.

[0068] like Figures 2-3 As shown, based on the same technical concept as the above embodiments, the present invention provides an RFID identification and anti-interference device for molten iron ladles, comprising:

[0069] The composite shielding mesh assembly 10 is installed on both sides of the track scale by means of a support assembly, and the bottom of the composite shielding mesh assembly 10 is controlled at a predetermined height above the ground to achieve physical shielding of signals.

[0070] The composite shielding mesh assembly 10 is composed of an inner layer 101 made of stainless steel wire mesh, a middle layer 102 made of electrolytic copper mesh, and an outer layer 103 made of anti-oxidation coated copper mesh, which are stacked together to achieve physical shielding of signals.

[0071] In this embodiment, the stainless steel wire constituting the inner layer 101 has the thickest diameter among the inner, middle, and outer layers. The middle layer 102, made of electrolytic copper wire, is the second thickest, and the outer layer 103, made of anti-oxidation coated copper wire, is the thinnest. It should be noted that the middle layer 102 uses a 20-mesh electrolytic copper mesh, while the inner layer 101 uses a 10-mesh mesh. This reduces weight while providing good support strength. The outer layer 103, used for anti-oxidation, uses a 30-40 mesh anti-oxidation coated copper mesh. The finer outer layer 103 can better protect the middle layer 102 from oxidation.

[0072] In practical applications, the inner, middle, and outer layers are connected together by steel wire ties using a multi-point binding method.

[0073] In addition, mounting collars are welded to the upper and lower ends of both sides of the inner layer 101 for connection with the support assembly.

[0074] The support assembly includes flagpoles 3 arranged at equal intervals, with a concrete foundation 1 poured at the bottom of the flagpoles 3. A laser rangefinder 8 and an inclination sensor 9 are installed on the flagpoles 3 for installing a composite shielding mesh assembly 10, so that the deviation between the composite shielding mesh assembly 10 and the center line of the track scale does not exceed a first threshold, and the bottom height above the ground is controlled at a predetermined height.

[0075] In this embodiment, a threaded hole is provided on the inner wall of the bottom end of the flagpole 3, and a hole matching the diameter of the flagpole 3 is opened on the upper surface of the concrete foundation 1. A connecting column 2 that can be threadedly connected to the inner wall of the flagpole 3 is pre-embedded in the inner bottom wall of the hole. After the flagpole 3 and the connecting column 2 are connected, the flagpole can be fixed to withstand a level 10 wind load.

[0076] A ring-shaped support seat 5 is provided on the flagpole 3, and a connecting sleeve 6 is also fitted on it. The connecting sleeve 6 is an openable clamp. During installation, the connecting sleeve 6 can be locked to the surface of the flagpole 3 using bolts. The bottom end of the connecting sleeve 6 rests on the support seat 5. On the outside of the connecting sleeve 6, there are also ear plates 7 for installing the laser rangefinder 8 and the tilt sensor 9.

[0077] Two net hanging seats 4 are provided on the flagpole 3. The net hanging seat 4 includes a ring seat. The ring seat has plug-in rods that are adapted to the installation collar welded on the left and right sides. In this way, one flagpole 3 can connect two composite shielding net assemblies 10.

[0078] Meanwhile, in order to reduce shielding gaps, the two plug rods on the ring seat are staggered. This allows for overlap when the composite shielding mesh assembly 10 is connected to the flagpole 3, thus avoiding shielding gaps at the connection.

[0079] It is important to note that after the composite shielding mesh assembly 10 is installed on the flagpole 3, the mesh surface of the composite shielding mesh assembly 10 is perpendicular to the output end of the laser rangefinder 8, and at the same time, the output end of the tilt sensor 9 is perpendicular to the ground.

[0080] It also includes an RFID identification host set between the composite shielding mesh assembly 10 and the track scale, and the RFID identification host integrates a data reading module and a data shielding module.

[0081] The data reading module is used to read RFID data from vehicles that pass through the RFID identification host as they enter the physical shielded space on the track scale.

[0082] The data shielding module is used to filter RFID signals from non-iron molten iron tanks using a signal filtering algorithm based on RFID data prefix verification. It is also used to capture the timestamps of RFID data on the two-rail vehicles when they are detected passing the RFID identification host simultaneously, calculate the time difference between the arrival of the RFID signals of the two-rail vehicles, and eliminate cross-interference signals based on the calculated time difference.

[0083] In this embodiment, the prefix verification algorithm of the data shielding module is used to identify RFID signals not carried by molten iron ladles based on the fixed prefix of the RFID data of the molten iron ladle.

[0084] Example

[0085] In this embodiment, the composite shielding mesh assembly 10 uses a 20-mesh electrolytic copper mesh (conductivity ≥ 5.8 × 10⁻⁶). 7 This is a three-layer composite structure consisting of a stainless steel wire mesh (S / m) and a 10mm×10mm stainless steel wire mesh (tensile strength ≥550MPa). The inner layer 101 is a stainless steel wire mesh providing structural support, with an aperture design that meets railway clearance standards; the middle layer 102 is a 20-mesh copper mesh with a mesh size of 0.8mm×0.8mm, which, according to electromagnetic simulation verification, can attenuate more than 95% of signals in the 860-960MHz frequency band; the outer layer 103 is an anti-oxidation coated copper mesh to improve weather resistance in industrial environments. In this embodiment, the standard dimensions of the composite mesh are 3.2m high × 10.5m long, which can be adaptively adjusted ±0.5m according to the length of the track scale on site.

[0086] The specific production steps are as follows:

[0087] 1. Based on the length of the track scale on site, cut stainless steel wire mesh and 20-mesh copper shielding mesh to a length of 10.5m each, leaving a 5cm flange on both sides for fixing.

[0088] 2. Combine the cut stainless steel wire mesh and 20-mesh copper shielding mesh. First, fix the stainless steel wire mesh to the inside of the flagpole 3, and then cover the outside of the wire mesh with the copper shielding mesh, ensuring that the two are tightly attached.

[0089] 3. Apply an anti-oxidation coating to the surface of the shielding mesh to prevent the copper mesh from oxidizing in the industrial environment and affecting the shielding effect.

[0090] In this embodiment, the support assembly includes multiple 4.5m high, 89mm diameter stainless steel flagpoles 3, arranged at 1m intervals, with C30 concrete foundations 1 (500mm×500mm×800mm) poured at the bottom, and anchor bolts built in for fixing against level 10 wind loads. Simultaneously, a laser rangefinder 8 and a tilt sensor 9 are integrated on the flagpoles 3.

[0091] It is important to note that the output end of the laser rangefinder 8 is directed vertically toward the two side rails, while the output end of the tilt sensor 9 is directed vertically toward the ground, ensuring that the deviation between the shielding net and the center line of the track balance is ≤50mm, and the bottom height above the ground is precisely controlled at 1.0±0.1m.

[0092] The installation steps are as follows:

[0093] 1. The actual measured installation height of the electronic tag on the molten iron ladle is 3.5m, the length of the dynamic track scale body is 10m, and the center distance between two adjacent molten iron lines is 5m.

[0094] 2. Concrete foundations 1 are poured every 1m along the length of the track scale, and stainless steel flagpoles 3 with a diameter of 100mm and a height of 4.5m are installed, for a total of 11 flagpoles 3.

[0095] 3. Install a laser rangefinder 8 and an inclination sensor 9 on the flagpole 3 to monitor the position and orientation of the shielding net in real time, ensuring that its deviation from the center line of the track scale is controlled within 50mm and the bottom height from the ground is accurately controlled at 1.0±0.1m.

[0096] In this embodiment, the data shielding module employs an RFID signal filtering algorithm based on prefix verification. Specifically, the first 7 bits of the RFID data from the molten iron ladle are pre-fixed as "3000010" (hexadecimal encoding) in the reader, with the 8th-10th bits representing the ladle number segment. The 46-bit RFID data is parsed in real-time, and signals with a non-"3000010" prefix (such as automotive RFID) trigger a three-level filtering mechanism (signal strength verification → encoding rule verification → dynamic time window verification).

[0097] The specific settings are as follows:

[0098] 1. Enter the fixed prefix "3000010" of the RFID data of the molten iron ladle into the RFID reader, and set the effective data length to 1-10 digits and the ladle number selection area length to the 8th-10th digit.

[0099] 2. Write a prefix verification algorithm to parse the 46-bit RFID data in real time, compare the actual prefix in the data with "3000010", and if they do not match, filter the signal and trigger a three-level filtering mechanism.

[0100] In this embodiment, the three-level filtering mechanism is as follows: First, the signal strength is checked, and if the signal strength is too low, it is directly rejected; then, the encoding rules are checked, and if the encoding rules do not conform to the format of molten iron ladle RFID data, it is rejected; finally, the dynamic time window is checked, and if the signal does not meet expectations within the time window, it is rejected.

[0101] In this embodiment, when the molten iron ladle car passes the track scale, the composite shielding mesh component 10 physically shields the signals between adjacent tracks, attenuating more than 95% of the 860-960MHz frequency band signals, achieving a spatial isolation of ≥28dB, and ensuring complete masking of tag signals. Simultaneously, the data shielding module reads the vehicle's RFID data in real time and filters out non-molten iron ladle RFID signals using a prefix check algorithm. When simultaneous passage of two vehicles on both tracks is detected, a "physical shielding + software filtering" linkage mechanism is activated. The software compares the arrival time difference (Δt≥50ms) of the two track RFID signals in real time, eliminating cross-interference signals.

[0102] Test results:

[0103] 1. Dual-track synchronous vehicle passage test: When two molten iron ladle cars pass through the track scale synchronously at a speed of 5km / h, 1000 continuous measurement tests are conducted. The results show that the RFID system has a 100% correct identification rate and a 0% error rate in matching weight with ladle number.

[0104] 2. Anti-interference test: When the vehicle RFID was activated at a distance of 30 meters from the weighbridge, the system's correct recognition rate remained at 100%, effectively eliminating signal interference from weighbridges and other equipment.

[0105] 3. Environmental adaptability test: After the shielding mesh was subjected to a level 7 gale, the displacement was less than 50mm, and the signal attenuation performance did not change significantly, ensuring the stability and reliability of the shielding mesh in harsh environments.

[0106] The working principle of the above embodiment is as follows: First, based on FDTD electromagnetic simulation technology, a three-dimensional geometric model including the shielding mesh, the track scale, and the molten iron ladle tag is established. In this step, the height of the shielding mesh is calculated based on the installation height of the molten iron ladle electronic tag (e.g., 3.5m), the bottom height of the shielding mesh from the ground (e.g., 1.0m ± 0.1m), and the safety margin (e.g., 0.5m) (which must satisfy H ≥ h_{tag} - h_{from the ground} + safety margin). Subsequently, the RFID signal attenuation is verified through FDTD electromagnetic simulation to ensure that the attenuation of the RFID signal meets the standard. The copper mesh parameters (e.g., mesh diameter d and signal wavelength λ) are input and substituted into the following attenuation formula to ensure that the copper mesh of the target mesh count (e.g., 20-mesh electrolytic copper mesh) has an attenuation of ≥95% in the 860-960MHz frequency band. After verification, a three-dimensional spatial model is constructed based on the actual layout of the track scale (e.g., length 10m) to provide precise guidance for physical layout.

[0107] Next, assemble the composite shielding mesh components and support components according to the model display;

[0108] After assembly, the composite shielding mesh assembly first physically shields the signal, effectively attenuating RFID signals in specific frequency bands and blocking external interference sources such as automotive RFID and logistics RFID signals. Simultaneously, support components ensure that the deviation between the composite shielding mesh assembly and the centerline of the track scale is within a specified threshold, and the bottom height from the ground is precisely controlled, guaranteeing the accuracy and effectiveness of the physical shielding.

[0109] Secondly, the data shielding module achieves data-level shielding: when a vehicle passes the track scale, the system reads the RFID data and processes it using the data shielding module. It analyzes the 46-bit RFID data in real time and filters out non-molten iron ladle signals using a prefix check algorithm (fixed prefix "3000010"). If the actual prefix does not match (e.g., with automotive RFID), a three-level filtering mechanism is triggered (signal strength check → encoding rule check → dynamic time window check) to ensure 100% shielding of external interference. When two vehicles pass synchronously (e.g., two molten iron ladle cars running parallel at 5 km / h), the software captures the timestamps of the dual-track RFID signals and calculates the time difference (Δt ≥ 50ms is the standard time). If the time difference is less than the standard time (e.g., Δt < 50ms), it is determined to be a cross-interference signal and discarded; if the time difference is not less than the standard time, it is determined to be a valid signal and ladle number matching is performed.

[0110] Thus, the combined mechanism of physical shielding and data shielding reduces the crosstalk rate of the dual-track system to ≤3.2% and the tank number identification accuracy to ≥99.99%. Meanwhile, the modular support structure (such as flagpole + concrete foundation) supports rapid assembly and disassembly, greatly improving construction efficiency.

[0111] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preventing interference with RFID identification of molten iron ladles, characterized in that, include: Based on FDTD electromagnetic simulation, a three-dimensional geometric model including a shielding mesh, a track scale, and a molten iron ladle was established, and simulation verification was performed based on the constructed three-dimensional geometric model. Based on the validated three-dimensional geometric model, the shielding mesh is arranged on both sides of the track scale to form a physical shielding space. The shielding mesh includes support components and composite shielding mesh components. When a monorail vehicle is detected to have entered the physically shielded space, the RFID data on the vehicle is read, and the RFID signals of non-iron molten steel tanks are filtered out by a prefix check algorithm. When the dual-rail vehicles are detected to enter the physical shielded space simultaneously, the timestamps of the RFID data on the dual-rail vehicles are captured respectively, the time difference of arrival of the RFID signals of the dual-rail vehicles is calculated, and cross-interference signals are eliminated based on the calculated time difference.

2. The RFID identification and anti-interference method for molten iron ladles according to claim 1, characterized in that: Based on FDTD electromagnetic simulation, a three-dimensional geometric model including a shielding mesh, a track scale, and a molten iron ladle was established. Simulation verification was then performed based on the constructed three-dimensional geometric model, including: The height of the shielding mesh is determined based on the installation height of the electronic tag on the molten iron ladle, the ground clearance of the bottom of the shielding mesh, and the safety margin. Based on the actual layout of the track scale, and according to the determined height of the shielding net, a three-dimensional spatial geometric model including the shielding net, the track scale, and the molten iron ladle is constructed. Based on FDTD electromagnetic simulation, it was verified whether the attenuation of the RFID signal on the molten iron ladle met the requirements. Adjust the shielding mesh according to the verification results until the RFID signal attenuation on the molten iron ladle meets the requirements.

3. The RFID identification and anti-interference method for molten iron ladles according to claim 2, characterized in that: The height of the shielding mesh satisfies H≥h_{label}-h_{ground clearance}+safety margin; Where H is the height of the shielding mesh, h_{tag} is the installation height of the electronic tag on the molten iron ladle, and h_{distance from the ground} is the distance between the bottom of the shielding mesh and the ground.

4. The RFID identification and anti-interference method for molten iron ladles according to claim 2, characterized in that: Verify whether the RFID signal attenuation meets the requirements, including: Input the copper mesh parameters and substitute them into the following attenuation formula: ， Where A is the attenuation, d is the mesh diameter, and λ is the signal wavelength; Verify whether the attenuation of the target radio frequency signal by the copper mesh with the target mesh count is not lower than the standard amount.

5. The RFID identification and anti-interference method for molten iron ladles according to claim 1, characterized in that: Filtering non-ferrous molten iron tank RFID signals using a prefix check algorithm includes: The system analyzes RFID data in real time, compares the actual prefix in the RFID data with the fixed prefix of the RFID tag on the molten iron ladle, and filters the signal if they do not match, triggering a three-level filtering mechanism.

6. The RFID identification and anti-interference method for molten iron ladles according to claim 1, characterized in that: Cross-interference signals are eliminated based on the calculated time difference, including: Compare the calculated time difference with the standard time: If the time difference is less than the standard time, it is judged as a cross-interference signal and is eliminated. If the time difference is not lower than the standard time, it is considered a valid signal and tank number matching is performed.

7. An RFID identification and anti-interference device for molten iron ladles, characterized in that, include: A composite shielding mesh assembly is provided, which is installed on both sides of the track scale by a support assembly, and the bottom of the composite shielding mesh assembly is controlled at a predetermined height above the ground to achieve physical shielding of signals. An RFID identification host is installed between the composite shielding mesh component and the track scale. The RFID identification host is used to read the RFID data on the vehicle when a monorail vehicle passes by the RFID identification host, and to filter the RFID signals of non-iron molten steel tanks based on the signal filtering algorithm of RFID data prefix verification.

8. The RFID identification and anti-interference device for molten iron ladle according to claim 7, characterized in that: The composite shielding mesh assembly includes: an inner layer made of stainless steel wire mesh, a middle layer made of electrolytic copper mesh, and an outer layer made of anti-oxidation coated copper mesh.

9. The RFID identification and anti-interference device for molten iron ladle according to claim 7, characterized in that: The support assembly includes: flagpoles arranged at equal intervals, with a concrete foundation poured at the bottom of each flagpole, and a laser rangefinder and tilt sensor installed on each flagpole.

10. The RFID identification and anti-interference device for molten iron ladle according to claim 7, characterized in that: The RFID identification host is also used to capture the timestamps of the RFID data on the dual-rail vehicles when the dual-rail vehicles pass by the RFID identification host synchronously, calculate the time difference of arrival of the RFID signals of the dual-rail vehicles, and eliminate cross-interference signals based on the calculated time difference.

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