Multi-tag RFID read-write device and method capable of preventing missed reading

Abstract

The invention relates to the technical field of RFID read-write devices, in particular to a multi-tag RFID read-write device and method for preventing missed reading. According to the technical scheme, the device comprises an electromagnetic shielding shell, an electromagnetic wave absorption layer in the electromagnetic shielding shell, a rotatable roller and a multi-antenna system. An adjusting ring with the adjustable inner diameter and an air bag buffering mechanism with the adjustable elasticity are arranged in the roller. The inner diameter and elasticity of the roller are adjusted according to the size and material of the object, the roller is driven to drive the object to roll, the multi-antenna system is controlled to conduct three-dimensional time-sharing scanning, data are processed, and a label list is output. According to the invention, dynamic rolling and space scanning are combined, and a roller structure capable of adaptively adjusting the inner diameter and elasticity is innovatively introduced, so that the problems of high recognition rate and non-destructive operation under the scenes of multi-label stacking, metal shielding and variable material sizes and materials are solved at one stroke, and the universality, the reliability and the operation safety of equipment are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of RFID reading and writing equipment technology, and in particular to a multi-tag RFID reading and writing device and method for preventing missed readings. Background Technology

[0002] Radio Frequency Identification (RFID) technology, as a key technology in the sensing layer of the Internet of Things (IoT), has been widely used in industrial production, logistics warehousing, and retail inventory management, enabling contactless, batch, and automated identification and tracking of items. However, in certain complex scenarios—especially when conducting batch inventory of large quantities of small objects that may contain metal components—the performance of traditional RFID readers faces severe challenges. When such objects are densely stacked, metal components reflect and block electromagnetic waves, and signal interference between tags makes it difficult to effectively activate and read RFID tags located at the bottom or those that are blocked, resulting in serious "missed reads." Industry practice shows that in such scenarios, the recognition rate of traditional equipment can plummet to below 60%, severely restricting data accuracy and operational efficiency.

[0003] To overcome this challenge, electromagnetic shielding cavities can be used to isolate external interference, multi-antenna systems can be deployed to achieve spatial signal coverage, and roller-type tumbling mechanisms can be introduced to change the tag's posture through physical movement. However, current designs based on fixed rollers, while pursuing high recognition rates, also reveal inherent limitations, mainly in two aspects: versatility and physical protection. The contradiction between fixed inner diameter and diverse materials: Existing rollers have a fixed inner diameter, but their optimal tumbling effect heavily depends on the ratio between the roller diameter (D) and the object size (d). When handling very small objects, an excessively large D / d ratio will cause the object to fall from an excessive height, resulting in a destructive impact; when handling larger objects, an excessively small D / d ratio will result in insufficient movement space, inadequate tumbling, and affect the recognition effect. Therefore, a fixed-size device can hardly maintain optimal performance across a wide range of material sizes.

[0004] Furthermore, the lack of rigid materials and dynamic protection: Existing designs mostly use rigid electromagnetic transparent materials such as PMMA and PBT to ensure radio frequency performance, but their buffering and energy absorption capabilities are weak. During the rotation of the drum, the collisions between objects and the inner wall, as well as between objects themselves, are high-frequency, random rigid impacts that can easily damage delicate objects and accelerate the fatigue, breakage, or detachment of RFID tags, causing permanent "missed reads" at the root. Summary of the Invention

[0005] The purpose of this application is to address the problems existing in the background technology by proposing a multi-tag RFID reading and writing device and method with an adjustable inner diameter to adapt to different object sizes and elastic adjustable features to achieve intelligent management of collision energy.

[0006] On the one hand, this application proposes a multi-tag RFID reading and writing device to prevent missed readings, including an electromagnetic shielding shell forming a closed reading and writing space, an electromagnetic wave absorbing layer installed inside the electromagnetic shielding shell, a roller located inside the electromagnetic wave absorbing layer and rotatably connected to the electromagnetic shielding shell, and a multi-antenna system installed inside the electromagnetic wave absorbing layer. The multi-antenna system is deployed in the electromagnetic shielding shell along the three-dimensional coordinate axis direction and surrounds the roller. A drive mechanism located on the electromagnetic shielding shell to drive the roller to rotate; An adjusting ring is installed inside the drum, forming a space for detecting workpieces. The drum is equipped with a receiving adjustment module that controls the inner diameter of the adjusting ring. The adjusting ring has elastic deformation capability. A buffer adjustment mechanism that controls the elasticity of the drum is installed inside the drum.

[0007] Optionally, the roller is provided with multiple guide grooves, and the adjusting ring includes a base rod slidably installed inside the guide groove. A connecting sleeve is rotatably installed on the base rod, and a telescopic plate is fixedly installed between two adjacent connecting sleeves.

[0008] Optionally, the receiving and adjusting module includes a drive ring and a push rod motor rotatably mounted on the roller, the output shaft of the push rod motor being rotatably connected to the drive ring, and a connecting rod being rotatably mounted between the drive ring and the base rod.

[0009] Optionally, two conductive rings are installed at a height on the roller, and a conductor is slidably connected to the conductive ring. The conductor is fixedly connected to the electromagnetic shielding shell through a support rod. The conductor is connected to the power supply through a first wire, and the conductor is connected to the push rod motor through a second wire.

[0010] Optionally, the buffer adjustment mechanism includes a support plate fixedly installed on the base rod and a sliding sleeve slidably installed on the support plate. An airbag is fixedly installed inside the sliding sleeve. The airbag is fixedly connected to the support plate. Two adjacent airbags are connected by a first air pipe. A second air pipe is fixedly installed on one of the airbags. An air pipe connector connected to the second air pipe is installed on the roller.

[0011] Optionally, the air pipe connector includes an air ring fixedly installed on the roller, an air chamber inside the air ring, the second air pipe communicating with the air chamber, a sealing ring for sealing the air chamber connected to the air ring, the sealing ring being fixedly connected to the electromagnetic shielding shell via a fixing rod, a connector fixedly installed on the sealing ring, and an air pump system communicating with the connector being installed on the electromagnetic shielding shell.

[0012] Optionally, a sealing plate is fixedly installed at one end of the adjusting ring, the outer ring of the sealing plate is fixedly connected to the roller, the sealing plate is elastic, a base is installed at a height inside the electromagnetic shielding shell, the base is rotatably connected to the roller through a bearing, and a bucket lid is rotatably attached to one end of the roller.

[0013] Optionally, the multi-antenna system includes an X antenna group, a Y antenna group, and a Z antenna group fixedly installed inside an electromagnetic shielding housing, each of which includes at least two RFID antennas.

[0014] Optionally, the drive mechanism includes a motor fixedly mounted on the electromagnetic shielding housing, and the output shaft of the motor is coaxially and fixedly connected to the roller via a transmission shaft.

[0015] On the other hand, this application proposes a multi-tag RFID reading and writing method to prevent missed reads, applied to the aforementioned multi-tag RFID reading and writing device, comprising the following steps: Step 1: Place the batch of objects to be identified into the receiving space formed by the adjustment ring; Based on the average size and fragility of the object to be identified, the inner diameter of the accommodating space is adjusted to the optimal value by controlling the expansion and contraction of the adjustment ring through the accommodating adjustment module. At the same time, by using a buffer adjustment mechanism and an external air pump system, air is inflated and deflated to the airbag network, adjusting the elasticity of the inner wall of the roller to a softness or hardness that matches the needs of object protection. Step 2: Start the motor of the drive mechanism to drive the drum to start rotating at the set speed, so that the internal objects will tumble continuously and irregularly. The multi-antenna system is scheduled to work, so that each antenna in the X antenna group, Y antenna group and Z antenna group is activated in a cycle according to a preset time sequence, and the object rolling in a time-division rotating scan is performed from different directions in three-dimensional space. Step 3: The RFID tag data read by the multi-antenna system is transmitted to the control host in real time; The host computer runs a deduplication and fusion algorithm to merge the tag IDs obtained from multiple scans and generate a unique tag list. If no new tag ID is found in several consecutive scanning cycles, it is determined that all readable tags have been identified, and the process proceeds to the next step. Step 4: The host computer uploads the final deduplicated complete tag list to the host computer management system via the data interface; The drive mechanism stops working, the roller stops rotating, all objects are removed, and this batch recognition operation is completed.

[0016] In summary, this application includes at least one of the following beneficial technical effects: This application fundamentally solves the problem of missed readings when multiple tags, small-sized objects containing metal are stacked, by breaking the collaborative mechanism of stacking through physical rolling and three-dimensional antenna spatial encirclement scanning, resulting in an extremely high recognition rate; Furthermore, the adjustable inner diameter adjustment ring enables a single device to adaptively optimize the processing space for objects of different sizes, making it highly versatile. The airbag-based buffer adjustment mechanism makes the inner wall of the roller elastically adjustable, providing continuous buffering from rigid support to flexible protection according to the material properties. While ensuring full tumbling, it greatly reduces the risk of damage to objects and RFID tags in collisions. Attached Figure Description

[0017] Figure 1 Schematic diagram of a multi-tag RFID reader / writer Figure 1 ; Figure 2 Schematic diagram of a multi-tag RFID reader / writer Figure 2 ; Figure 3 This is a schematic diagram of the electromagnetic shielding shell and the electromagnetic wave absorbing layer. Figure 4 This is a schematic diagram of the internal structure of an electromagnetic shielding shell. Figure 5 This is a schematic diagram of a multi-antenna system. Figure 6 This is a schematic diagram of the drum structure; Figure 7 This is a schematic diagram of the adjustment ring structure; Figure 8 for Figure 7 A magnified view of a section at point A in the middle; Figure 9 This is a schematic diagram of the gas ring structure; Figure 10 This is a schematic diagram of the conductive ring structure; Figure 11 This is a schematic diagram of the internal structure of the drum.

[0018] Reference numerals: 1. Electromagnetic shielding shell; 11. Box door; 2. Electromagnetic wave absorbing layer; 3. Roller; 31. Bucket lid; 311. Base; 312. Bearing; 32. Drive mechanism; 321. Motor; 322. Drive shaft; 33. Adjusting ring; 331. Guide groove; 332. Base rod; 333. Connecting sleeve; 334. Telescopic plate; 335. Sealing plate; 34. Receiving adjustment module; 341. Drive ring; 342. Push rod motor; 343. Connecting rod; 344. 345. Conductive ring; 346. Conductor; 347. Support rod; 348. First conductor; 349. Second conductor; 350. Buffer adjustment mechanism; 361. Support plate; 352. Sliding sleeve; 353. Airbag; 354. First air tube; 355. Second air tube; 356. Air ring; 357. Air chamber; 358. Sealing ring; 359. Fixing rod; 3510. Connector; 4. Multi-antenna system; 41. X antenna group; 42. Y antenna group; 43. Z antenna group. Detailed Implementation

[0019] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0020] Example: Figures 1 to 5 As shown, this application proposes a multi-tag RFID reading and writing device to prevent missed readings, including an electromagnetic shielding shell 1 forming a closed reading and writing space, an electromagnetic wave absorbing layer 2 installed inside the electromagnetic shielding shell 1, a roller 3 located inside the electromagnetic wave absorbing layer 2 and rotatably connected to the electromagnetic shielding shell 1, and a multi-antenna system 4 installed inside the electromagnetic wave absorbing layer 2. The multi-antenna system 4 is deployed along the three-dimensional coordinate axis direction inside the electromagnetic shielding shell 1 and surrounds the roller 3. The electromagnetic shielding shell 1 and the electromagnetic wave absorbing layer 2 work together to create a highly controllable electromagnetic environment. The electromagnetic shielding shell 1 effectively isolates electromagnetic interference from complex external industrial sites and prevents internal radio frequency signals from leaking out, causing pollution or misreading. The electromagnetic wave absorbing layer 2 can absorb internally reflected electromagnetic waves, significantly weakening multipath effects and standing wave interference, creating a stable and pure radio frequency field for the multi-antenna system 4 to read.

[0021] The electromagnetic shielding shell 1 is rotatably mounted with a door 11, and a base 311 is mounted inside the electromagnetic shielding shell 1. The base 311 is rotatably connected to the roller 3 through a bearing 312. One end of the roller 3 is rotatably mounted with a lid 31. By opening or closing the lid 31, the object to be tested can be placed inside the roller 3, so that the object to be tested will be irregularly flipped inside the roller 3 as the roller 3 rotates.

[0022] like Figure 1 , Figure 2As shown, the multi-tag RFID reading and writing device in this embodiment also includes a drive mechanism 32 installed on the electromagnetic shielding shell 1 to drive the roller 3 to rotate. The drive mechanism 32 includes a motor 321 fixedly installed on the electromagnetic shielding shell 1. The output shaft of the motor 321 is coaxially fixedly connected to the roller 3 through a transmission shaft 322. The motor 321 can drive the roller 3 to rotate. The motor 321 can drive the roller 3 to rotate at a controllable speed, so that the object to be identified inside the roller 3 undergoes continuous and irregular tumbling motion, thereby dynamically changing the spatial position and orientation of each RFID tag, effectively breaking the physical obstruction caused by the stacking of objects, and ensuring that the tags pressed at the bottom or wrapped inside have the opportunity to be exposed in the effective reading and writing area of ​​the antenna.

[0023] As a new implementation method, such as Figures 5 to 8 As shown, the multi-tag RFID reader / writer also includes an adjustment ring 33 installed inside the drum 3. The adjustment ring 33 forms a receiving space for detecting workpieces inside the drum 3. The drum 3 is provided with multiple guide grooves 331. The adjustment ring 33 includes a base rod 332 slidably installed inside the guide groove 331. A connecting sleeve 333 is rotatably installed on the base rod 332. A telescopic plate 334 is fixedly installed between two adjacent connecting sleeves 333. By driving multiple base rods 332 to move synchronously along the radial direction of the drum, the annular frame formed by the connecting sleeves 333 and the telescopic plate 334 is driven to expand and contract, thereby continuously changing the diameter of the internal receiving space defined by the frame.

[0024] This allows the same device to adaptively match objects of different sizes. For small objects, the inner diameter can be reduced to decrease their drop height and movement space, avoiding damage and unstable readings caused by excessive tumbling. For large objects, the inner diameter can be expanded to provide sufficient tumbling space, preventing jamming and ensuring thorough mixing, thereby maintaining optimal tumbling dynamics and reading efficiency across a wide range of material sizes.

[0025] Furthermore, a sealing plate 335 is fixedly installed at one end of the adjusting ring 33. The outer ring of the sealing plate 335 is fixedly connected to the roller 3. The sealing plate 335 is elastic and plays a role in dynamic sealing and buffering. The sealing plate 335 can maintain the sealing of the connection when the adjusting ring 33 extends and retracts, prevent small objects from falling into the mechanical gap, and allow the adjusting ring 33 to have a certain amount of axial movement, ensuring the smoothness of the mechanism's movement.

[0026] like Figures 5 to 7 , Figures 10 to 11As shown, in this embodiment, a receiving adjustment module 34 for controlling the inner diameter of the adjusting ring 33 is installed on the roller 3. The receiving adjustment module 34 includes a drive ring 341 and a push rod motor 342 rotatably mounted on the roller 3. The output shaft of the push rod motor 342 is rotatably connected to the drive ring 341. A connecting rod 343 is rotatably mounted between the drive ring 341 and the base rod 332. The linear motion of the push rod motor 342 pushes or pulls the drive ring 341 to move along the roller axial direction. The drive ring 341 converts the axial motion into the radial motion of each base rod 332 through the circumferentially distributed connecting rods 343, thereby realizing the synchronous and precise control of the inner diameter of the adjusting ring 33.

[0027] Furthermore, two conductive rings 344 are installed on the roller 3 at a height, and a conductor 345 is slidably connected to the conductive rings 344. The conductor 345 is fixedly connected to the electromagnetic shielding shell 1 through a support rod 346. The conductor 345 is connected to the power supply through a first wire 347. The conductor 345 is connected to the push rod motor 342 through a second wire 348. Since the push rod motor 342 needs to rotate synchronously with the roller 3 and the push rod motor 342 needs an external power supply, the above-mentioned arrangement can solve the problem of wire entanglement in order to prevent the wires from getting tangled.

[0028] Specifically, the conductive ring 344 and the conductor 345 form a rotating conductive interface. The conductor 345, which is fixed on the stationary housing, maintains sliding contact with the conductive ring 344, which rotates with the drum. This allows for the continuous and stable transmission of power from the external static power source to the push rod motor 342 on the drum. At the same time, it completely avoids the problem of wire tangling and breakage caused by the continuous rotation of the drum, ensuring the reliability of the equipment's long-term operation.

[0029] like Figures 7 to 9 As shown, in this embodiment, the adjusting ring 33 has elastic deformation capability. A buffer adjustment mechanism 35 for controlling the elasticity of the roller 3 is installed inside the roller 3. The buffer adjustment mechanism 35 includes a support plate 351 fixedly installed on the base rod 332 and a sliding sleeve 352 slidably installed on the support plate 351. An airbag 353 is fixedly installed inside the sliding sleeve 352. The airbag 353 is fixedly connected to the support plate 351. Two adjacent airbags 353 are connected by a first air pipe 354. A second air pipe 355 is fixedly installed on one of the airbags 353. An air pipe connector connected to the second air pipe 355 is installed on the roller 3. The traditional rigid or elastic non-adjustable inner wall is upgraded to an intelligent buffer surface based on air pressure control. As a buffer unit that directly contacts the object, the internal pressure of the airbag 353 directly determines the local equivalent stiffness. When the inflation pressure is high, the airbag 353 becomes harder, and the buffering capacity is weakened but the response is rapid. When the inflation pressure is low, the airbag 353 is soft and can effectively absorb impact energy through large deformation.

[0030] All airbags 353 are interconnected through pipelines to form a unified pressure chamber, ensuring consistent elasticity throughout the inner wall. This allows the device to dynamically adjust the hardness of the inner wall according to the fragility of the object being tested, minimizing damage to the object and tag during collisions while ensuring sufficient tumbling, thus fundamentally resolving the conflict between protection and readability.

[0031] It should be noted that since multiple airbags 353 are connected, when one airbag 353 is impacted, the pressure inside the airbag 353 increases, causing the airbags 353 in other positions to bulge outward, thereby applying a thrust to the object in other positions, further improving the effect of flipping the object.

[0032] Furthermore, the air pipe connector includes an air ring 356 fixedly installed on the roller 3, an air chamber 357 is provided inside the air ring 356, a second air pipe 355 communicates with the air chamber 357, a sealing ring 358 is connected to the air ring 356 to block the air chamber 357, the sealing ring 358 is fixedly connected to the electromagnetic shielding shell 1 through a fixing rod 359, a connector 3510 is fixedly installed on the sealing ring 358, and an air pump system communicating with the connector 3510 is installed on the electromagnetic shielding shell 1. The air pipe connector constitutes a rotary air passage interface.

[0033] Specifically, the fixed sealing ring 358 and connector 3510 introduce the air from the external air pump system into the air chamber 357 of the rotating air ring 356 through a sealed connection, and then distribute it to the entire airbag 353 network via the second air pipe 355. This ingenious design enables real-time, wireless monitoring and adjustment of the pressure of the internal airbags 353 during the high-speed continuous rotation of the roller.

[0034] like Figure 5 As shown, in this embodiment, the multi-antenna system 4 includes an X antenna group 41, a Y antenna group 42, and a Z antenna group 43 fixedly installed inside the electromagnetic shielding shell 1. Each of the X antenna group 41, Y antenna group 42, and Z antenna group 43 includes at least two RFID antennas. The system adopts a distributed deployment scheme along the three-dimensional coordinate axis of space, which realizes spatial enclosure and polarization diversity of dynamically changing tags inside the roller 3. It transmits and receives signals from different spatial directions, which can minimize the signal blind spots caused by the directionality or position of the tags. The multiple antennas can work in a time-division manner according to a preset time sequence, which is equivalent to performing rapid round-robin scanning of the tumbling object from multiple perspectives. Combined with the rotational movement of the roller, it greatly improves the probability that each tag is successfully read by at least one antenna from a favorable direction during the movement.

[0035] This application also proposes a multi-tag RFID reading and writing method to prevent missed readings, applied to the above-mentioned multi-tag RFID reading and writing equipment, including the following steps: Step 1: Place the batch of objects to be identified into the receiving space formed by the adjustment ring 33; Based on the average size and fragility of the object to be identified, the adjustment ring 33 is extended and retracted by the containment adjustment module 34 to adjust the inner diameter of the containment space to the optimal value. At the same time, through the buffer adjustment mechanism 35 and the external air pump system, air is inflated and deflated to the airbag 353 network, adjusting the elasticity of the inner wall of the roller 3 to a softness and hardness that matches the needs of object protection. Step 2: Start the motor 321 of the drive mechanism 32 to drive the roller 3 to start rotating at the set speed, so that the internal objects tumble continuously and irregularly. The multi-antenna system 4 is scheduled to work, so that each antenna in the X antenna group 41, Y antenna group 42, and Z antenna group 43 is activated cyclically according to a preset timing sequence, and performs time-division rotating scan of the rolling object from different directions in three-dimensional space. Step 3: The RFID tag data read by the multi-antenna system 4 is transmitted to the control host in real time; The host computer runs a deduplication and fusion algorithm to merge the tag IDs obtained from multiple scans and generate a unique tag list. If no new tag ID is found in several consecutive scanning cycles, it is determined that all readable tags have been identified, and the process proceeds to the next step. Step 4: The host computer uploads the final deduplicated complete tag list to the host computer management system via the data interface; The drive mechanism 32 stops working, the roller 3 stops rotating, all objects are removed, and this batch recognition operation is completed.

[0036] In this embodiment, during operation, the object to be identified is first placed into the receiving space formed by the retractable adjustment ring 33, and according to the average size of the object, the base rod 332 is driven to move radially by the receiving adjustment module 34, thereby adjusting the inner diameter of the receiving space to the optimal value to optimize the tumbling dynamics. At the same time, depending on the fragility of the object, the external air pump system inflates and deflates the interconnected airbag 353 network through the rotating air passage interface, dynamically adjusting the elasticity of the inner wall of the roller 3 to achieve intelligent cushioning. After startup, the motor 321 of the drive mechanism 32 drives the roller 3 to rotate at a constant speed, causing the object to continuously roll irregularly, constantly resetting its stacking state and label orientation. At the same time, the multi-antenna system 4 deployed in the electromagnetic shielding shell 1 is activated in a time-division manner according to a preset time sequence, and performs a round-robin scan of the rolling object in three-dimensional space. The electromagnetic shielding shell 1 and the electromagnetic wave absorption layer 2 together create a pure radio frequency environment, ensuring reading stability. The control host receives scanning data in real time, generates a unique tag list through a deduplication and fusion algorithm, and determines that the identification is complete when no new tags appear in multiple consecutive scanning cycles, and finally outputs a complete list.

[0037] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A multi-tag RFID reader / writer device for preventing missed reads, characterized in that, include: An electromagnetic shielding shell (1) forming a closed reading and writing space, an electromagnetic wave absorbing layer (2) installed inside the electromagnetic shielding shell (1), a roller (3) located inside the electromagnetic wave absorbing layer (2) and rotatably connected to the electromagnetic shielding shell (1), and a multi-antenna system (4) installed inside the electromagnetic wave absorbing layer (2). The multi-antenna system (4) is deployed in the electromagnetic shielding shell (1) along the three-dimensional coordinate axis and surrounds the roller (3). A drive mechanism (32) that drives the roller (3) to rotate, mounted on the electromagnetic shielding shell (1). An adjusting ring (33) is located inside the drum (3). The adjusting ring (33) forms a receiving space for detecting workpieces inside the drum (3). A receiving adjustment module (34) for controlling the inner diameter of the adjusting ring (33) is installed on the drum (3). The adjusting ring (33) has elastic deformation capability. A buffer adjustment mechanism (35) for controlling the elastic size of the drum (3) is installed inside the drum (3).

2. The multi-tag RFID reading and writing device for preventing missed reads according to claim 1, characterized in that, The roller (3) is provided with multiple guide grooves (331). The adjusting ring (33) includes a base rod (332) that is slidably installed inside the guide groove (331). A connecting sleeve (333) is rotatably installed on the base rod (332). A telescopic plate (334) is fixedly installed between two adjacent connecting sleeves (333).

3. The multi-tag RFID reading and writing device for preventing missed reads according to claim 2, characterized in that, The receiving and adjusting module (34) includes a drive ring (341) and a push rod motor (342) rotatably mounted on the roller (3). The output shaft of the push rod motor (342) is rotatably connected to the drive ring (341). A connecting rod (343) is rotatably mounted between the drive ring (341) and the base rod (332).

4. The multi-tag RFID reading and writing device for preventing missed reads according to claim 3, characterized in that, Two conductive rings (344) are mounted on the roller (3) at a height. A conductor (345) is slidably connected to the conductive ring (344). The conductor (345) is fixedly connected to the electromagnetic shielding shell (1) through a support rod (346). The conductor (345) is connected to the power supply through a first wire (347). The conductor (345) is connected to the push rod motor (342) through a second wire (348).

5. The multi-tag RFID reading and writing device for preventing missed reads according to claim 4, characterized in that, The buffer adjustment mechanism (35) includes a support plate (351) fixedly installed on the base rod (332) and a sliding sleeve (352) slidably installed on the support plate (351). An airbag (353) is fixedly installed inside the sliding sleeve (352). The airbag (353) is fixedly connected to the support plate (351). Two adjacent airbags (353) are connected by a first air pipe (354). A second air pipe (355) is fixedly installed on one of the airbags (353). An air pipe connector connected to the second air pipe (355) is installed on the roller (3).

6. The multi-tag RFID reading and writing device for preventing missed reads according to claim 5, characterized in that, The air pipe connector includes an air ring (356) fixedly installed on the roller (3), an air chamber (357) is provided inside the air ring (356), the second air pipe (355) is connected to the air chamber (357), a sealing ring (358) for sealing the air chamber (357) is connected to the air ring (356), the sealing ring (358) is fixedly connected to the electromagnetic shielding shell (1) through a fixing rod (359), a connector (3510) is fixedly installed on the sealing ring (258), and an air pump system connected to the connector (3510) is installed on the electromagnetic shielding shell (1).

7. The multi-tag RFID reading and writing device for preventing missed reads according to claim 6, characterized in that, One end of the adjusting ring (33) is fixedly installed with a sealing plate (335). The outer ring of the sealing plate (335) is fixedly connected to the roller (3). The sealing plate (335) is elastic. The electromagnetic shielding shell (1) is equipped with a base (311) at a height. The base (311) is rotatably connected to the roller (3) through a bearing (312). One end of the roller (3) is rotatably covered with a bucket lid (31).

8. The multi-tag RFID reading and writing device for preventing missed readings according to claim 7, characterized in that, The multi-antenna system (4) includes an X antenna group (41), a Y antenna group (42) and a Z antenna group (43) fixedly installed in an electromagnetic shielding shell (1), and each of the X antenna group (41), the Y antenna group (42) and the Z antenna group (43) includes at least two RFID antennas.

9. A multi-tag RFID reader / writer device for preventing missed reads according to claim 8, characterized in that, The drive mechanism (32) includes a motor (321) fixedly installed on the electromagnetic shielding shell (1), and the output shaft of the motor (321) is coaxially fixedly connected to the roller (3) through a transmission shaft (322).

10. A method for preventing missed reads in multi-tag RFID reading and writing, applied to the multi-tag RFID reading and writing device for preventing missed reads as described in claim 9, characterized in that, Includes the following steps: Step 1: Place the batch of objects to be identified into the receiving space formed by the adjustment ring (33); Based on the average size and fragility of the object to be identified, the inner diameter of the accommodating space is adjusted to the optimal value by controlling the extension and retraction of the adjustment ring (33) through the accommodating adjustment module (34); At the same time, by using the buffer adjustment mechanism (35) and the external air pump system, air is inflated and deflated to the airbag (353) network, and the elasticity of the inner wall of the roller (3) is adjusted to a softness and hardness that matches the object protection requirements. Step 2: Start the motor (321) of the drive mechanism (32) to drive the roller (3) to start rotating at the set speed, so that the internal objects continue to tumble irregularly; The multi-antenna system (4) is scheduled to work, so that each antenna in the X antenna group (41), Y antenna group (42), and Z antenna group (43) is activated in a cycle according to a preset time sequence, and the object in the rolling is scanned in a time-division cycle from different directions in three-dimensional space. Step 3: The RFID tag data read by the multi-antenna system (4) is transmitted to the control host in real time; The host computer runs a deduplication and fusion algorithm to merge the tag IDs obtained from multiple scans and generate a unique tag list. If no new tag ID is found in several consecutive scanning cycles, it is determined that all readable tags have been identified, and the process proceeds to the next step. Step 4: The host computer uploads the final deduplicated complete tag list to the host computer management system via the data interface; The drive mechanism (32) stops working, the roller (3) stops rotating, all objects are removed, and the batch recognition operation is completed.

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