A collaborative detection device for stored items based on radio frequency identification and an intelligent shelf

Abstract

The present invention relates to the technical field of storage item detection, and in particular, to a collaborative detection device for stored items and an intelligent shelf based on radio frequency identification. The device includes: a plurality of RFID antennas, a radio frequency switch matrix, an RFID reader main control board, and a host computer. The plurality of RFID antennas are installed on both sides of a single-row shelf; the radio frequency switch matrix includes a plurality of first radio frequency switches and a single second radio frequency switch. At least one of the first radio frequency switches is connected to the RFID antennas on either side of the shelf, and the connection channels between the two form a plurality of radio frequency signal transmission links. The first radio frequency switch can switch the radio frequency signal transmission links; the second radio frequency switch can switch the first radio frequency switches; the RFID reader main control board is connected to the radio frequency switch matrix; the host computer is connected to the RFID reader main control board. The present invention can solve the mutual interference problem between readers and the tag collision problem, and achieve non-missing reading detection of item tags on the intelligent shelf.

Description

Technical Field

[0001] The present invention relates to the technical field of storage item detection, and in particular to a collaborative detection device for stored items and an intelligent shelf based on radio frequency identification. Background Art

[0002] In the application and development of intelligent shelf systems, radio frequency identification (RFID) technology, with its significant advantages of non-contact, automatic identification, and data collection, has significantly improved the convenience and efficiency of item management compared to traditional manual operation methods. The RFID system architecture mainly consists of a host computer, a reader, and tags attached to items. A single reader can effectively cover and detect all items on its corresponding intelligent shelf, enabling intelligent statistics and management.

[0003] However, in actual deployment, to optimize space utilization, a layout method of double-row juxtaposed intelligent shelves is often adopted. In this scenario, if the readers of each shelf operate independently, signal conflicts will occur due to mutual electromagnetic interference, leading to missed readings and affecting the accuracy of item management. At the same time, the item tags between adjacent shelves may also collide due to the short distance, further exacerbating the identification problem.

[0004] In response to the above problems, the academic and industrial circles have carried out a series of studies to explore improvement solutions. For example, Yu Kuai et al. integrated RFID technology into the warehousing management of hazardous chemicals, achieving full-chain automated data processing and environmental monitoring from inspection, warehousing, inventory to outbound. Although this solution effectively improves the operation efficiency and safety, the method of using a handheld RFID terminal for inventory still increases the operation risk and labor cost. Du Juan et al. combined an embedded platform, an edge computing host, and RFID technology to propose an intelligent solution for the warehouse management of power grid companies, effectively improving the working efficiency of traditional intelligent shelves. However, this solution has specific requirements for the tag position (such as placing it on the bottom of the item or using special tags), which increases the complexity of item placement to a certain extent and reduces the usability of the system. Lei Jiabin et al. designed a low-frequency glass tube electronic intelligent shelf system based on RFID technology for the problem of low search efficiency of wafer boxes in some wafer fabs, realizing functions such as querying and displaying the storage information of wafer boxes on the intelligent shelf, which can effectively improve the search speed of wafer boxes. However, this research did not deeply explore the RFID detection optimization strategy in the environment of double-row juxtaposed intelligent shelves, and there are still problems such as mutual interference of radio frequency signals and tag identification collisions. Summary of the Invention

[0005] To this end, the technical problem to be solved by the present invention is to overcome the problems of mutual interference between readers and label recognition collisions between double-row shelves in the prior art, and provide a collaborative detection device for stored items based on radio frequency identification and an intelligent shelf. For the item management of a single-row shelf, RFID tags are provided on all items. The collaborative detection device for stored items based on radio frequency identification includes:

[0006] A plurality of RFID antennas, which are installed on both sides of the single-row shelf;

[0007] A radio frequency switch matrix, which includes a plurality of first radio frequency switches and a single second radio frequency switch. At least one of the first radio frequency switches is connected to the RFID antenna on either side of the shelf, and the connection channels between the two form a plurality of independently controllable radio frequency signal transmission links. The first radio frequency switch can switch the radio frequency signal transmission link; the second radio frequency switch can switch the first radio frequency switch;

[0008] An RFID reader main control board, which is connected to the radio frequency switch matrix;

[0009] And a host computer, which is connected to the RFID reader main control board;

[0010] Wherein, the host computer sends a detection instruction to the RFID reader main control board. After receiving the detection instruction, the RFID reader main control board broadcasts an activation signal to the RFID tags on the shelf through any radio frequency signal transmission link selected by the radio frequency switch matrix, and receives the radio frequency signal containing item information generated after the RFID tags are activated. The RFID reader main control board sends the radio frequency signal to the host computer, and the host computer obtains the item detection result on the shelf.

[0011] In an embodiment of the present invention, the RFID reader main control board includes a reader module, a radio frequency switch matrix control interface, and a radio frequency signal transmission interface. The radio frequency signal transmission interface is connected to the radio frequency communication interface of the radio frequency switch matrix for sending or receiving the radio frequency signal of the reader module; the radio frequency switch matrix control interface is connected to the radio frequency switch control interface of the radio frequency switch matrix for receiving the switch on / off control signal of the reader module.

[0012] In an embodiment of the present invention, the reader module is connected to the host computer.

[0013] In an embodiment of the present invention, after the reader module receives a detection instruction from the host computer, it switches to the specified first radio frequency switch through the second radio frequency switch, and then uses the first radio frequency switch to turn on the radio frequency signal transmission link on one side of the specified layer of shelves. The transmitting port of the reader module transmits a part of the activation signal to the RFID tag through the specified radio frequency signal transmission link, and the remaining part of the activation signal is sent back to the detection port of the reader module for forward detection. The radio frequency signal generated after the RFID tag is activated is received and sent to the host computer as the first detection result through the reader module;

[0014] The radio frequency signal is switched to the radio frequency signal transmission link on the other side of the same layer of shelves by switching the radio frequency switch matrix, and the received radio frequency signal is sent back to the host computer as the second detection result through the reader module. The host computer performs a merging and duplicate removal process on the first detection result and the second detection result to obtain the inventory result of the stored items.

[0015] For the item management of multiple rows of parallel shelves, the present invention also provides a collaborative detection device for stored items based on radio frequency identification. RFID tags are provided on all items, and the device includes:

[0016] Multiple RFID antennas, which are installed on both sides of multiple rows of shelves;

[0017] Multiple radio frequency switch matrices, each radio frequency switch matrix includes multiple first radio frequency switches and a single second radio frequency switch. Among them, at least one of the first radio frequency switches is connected to the RFID antennas on the same side of any row of shelves, and the connection channels between the two constitute multiple independently controllable radio frequency signal transmission links. The first radio frequency switch is used for the radio frequency signal transmission link on the same side of multiple rows of shelves; the second radio frequency switch can switch the first radio frequency switch;

[0018] Multiple RFID reader main control boards, the RFID reader main control boards are connected to the radio frequency switch matrices, and the number of the RFID reader main control boards is the same as the number of the radio frequency switch matrices;

[0019] And a host computer, the host computer is connected to the RFID reader main control board;

[0020] Among them, the host computer sends a detection instruction to the main control board of the RFID reader. In the host computer control cooperation mode or the external interrupt control cooperation mode, after receiving the detection instruction, the main control board of the RFID reader broadcasts an activation signal to the RFID tags on the shelf through any radio frequency signal transmission link selected by the radio frequency switch matrix, and receives the radio frequency signal containing item information generated after the RFID tags are activated. The main control board of the RFID reader sends the radio frequency signal to the host computer to obtain the detection result of the items on the shelf.

[0021] In an embodiment of the present invention, the number of the main control boards of the RFID readers and the radio frequency switch matrices is two, and the two are connected in one-to-one correspondence. Each main control board of the RFID reader includes a reader module, a radio frequency switch matrix control interface, and a radio frequency signal transmission interface; among them, the reader module is connected to the host computer, and the radio frequency signal transmission interface is connected to the radio frequency communication interface of the radio frequency switch matrix for sending the activation signal of the reader module or receiving the radio frequency signal; the radio frequency switch matrix control interface is connected to the radio frequency switch control interface of the radio frequency switch matrix for receiving the switch on / off control signal of the reader module.

[0022] In an embodiment of the present invention, the setting method of the host computer control cooperation mode includes: the host computer randomly selects a reader module to be configured as the main reader, and the other reader is configured as the slave reader. The main reader emits an activation signal to the RFID tags through the radio frequency signal transmission link on one side of the specified layer of the shelf, and the main reader and the slave reader synchronously receive the radio frequency signal after the tags are activated.

[0023] In an embodiment of the present invention, the setting method of the host computer control cooperation mode further includes: after the detection work in the main-slave reader working mode is completed once, the host computer configures the current slave reader as the main reader, and the current main reader as the slave reader. The newly configured main reader emits an activation signal to the RFID tags through the radio frequency signal transmission link on one side of the specified layer of the shelf, and the main reader and the slave reader synchronously receive the radio frequency signal after the tags are activated.

[0024] In an embodiment of the present invention, the method for setting the external interruption control cooperation mode includes: two reader modules are connected through signal lines. The host computer arbitrarily selects one reader module and configures it as the main reader. The main reader sends an interruption signal to the other reader module through the signal line to configure it as the slave reader. The main reader transmits an activation signal to the RFID tag through the radio frequency signal transmission link on one side of the specified layer of the shelf. The main reader and the slave reader synchronously receive the radio frequency signal after the tag is activated. After the detection work of the slave reader module is completed, the slave reader module is configured as the new main reader, and the new main reader sends an interruption signal to the original main reader module to switch it into the new slave reader.

[0025] The present invention also provides an intelligent shelf, including the collaborative detection device for stored items based on radio frequency identification according to any one of the above.

[0026] The above technical solutions of the present invention have the following advantages compared with the prior art:

[0027] 1. For the layout of a single-row intelligent shelf, the present invention uses one reader and a radio frequency switch matrix to implement the dual-antenna polling detection working mode on each layer of the intelligent shelf, achieving non-missing detection of item tags.

[0028] 2. For the layout of a double-row parallel intelligent shelf, the present invention uses the collaborative working mode of two readers and two radio frequency switch matrices to solve the mutual interference problem between readers in a limited space, achieving non-missing detection of item tags on the intelligent shelf.

[0029] 3. The collaborative working mode of the reader and the double radio frequency switch matrix forms space-division multiplexing, which can solve the problem that in the prior art, due to the short distance between layers of the shelf, item tags are prone to collision when being read simultaneously. Description of the Drawings

[0030] In order to make the content of the present invention easier to be clearly understood, the following further details the present invention according to the specific embodiments of the present invention in combination with the drawings, where

[0031] Figure 1 is a schematic diagram of a double-row parallel intelligent shelf;

[0032] Figure 2 is a schematic structural diagram of the detection device for stored items for a single-row shelf;

[0033] Figure 3 is a schematic internal structure diagram of the reader module;

[0034] Figure 4 is a schematic structural diagram of the radio frequency switch matrix;

[0035] Figure 5 It is a schematic diagram of the cooperative detection of the same layer of shelves by two readers. Among them, (a) shows the schematic diagram of the cooperative detection of the same layer of shelves when reader R1 is the master reader and reader R2 is the slave reader, and (b) shows the schematic diagram of the cooperative detection of the same layer of shelves when reader R1 is the master reader and reader R2 is the slave reader;

[0036] Figure 6 It is a schematic diagram of the structure of the storage item detection device for double-row shelves under the control cooperation mode of the host computer;

[0037] Figure 7 It is to use Figure 6 The flowchart of the polling detection of the double-row shelves by the device shown;

[0038] Figure 8 It is a schematic diagram of the structure of the storage item detection device for double-row shelves under the control cooperation mode of the external interrupt;

[0039] Figure 9 It is to use Figure 8 The flowchart of the polling detection of the double-row shelves by the device shown. Specific embodiments

[0040] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the exemplified embodiments are not intended to limit the present invention.

[0041] Embodiment 1

[0042] Referring to Figure 2 As shown, for a single-row shelf, the present invention provides a collaborative detection device for storage items based on radio frequency identification. All items are provided with RFID tags, and the detection device includes:

[0043] Multiple RFID antennas, which are installed on both sides of the single-row shelf;

[0044] A radio frequency switch matrix, which includes multiple first radio frequency switches and a single second radio frequency switch. At least one of the first radio frequency switches is connected to the RFID antenna on either side of the shelf, and the connection channels between them form multiple independently controllable radio frequency signal transmission links. The first radio frequency switch can switch the radio frequency signal transmission links; the second radio frequency switch can switch the first radio frequency switches;

[0045] An RFID reader main control board, which is connected to the radio frequency switch matrix;

[0046] and a host computer, the host computer being connected to the main control board of the RFID reader;

[0047] Wherein, the host computer sends a detection instruction to the main control board of the RFID reader. After receiving the detection instruction, the main control board of the RFID reader broadcasts an activation signal to the RFID tags on the shelf through any one of the radio frequency signal transmission links selected by the radio frequency switch matrix, and receives the radio frequency signal containing item information generated after the RFID tags are activated. The main control board of the RFID reader sends the radio frequency signal to the host computer, and the host computer obtains the item detection result on the shelf.

[0048] In this embodiment, the main control board of the RFID reader includes a reader module, a radio frequency switch matrix control interface, and a radio frequency signal transmission interface. The reader module is communicatively connected to the host computer through a 485 bus.

[0049] In this embodiment, the radio frequency signal transmission interface is connected to the radio frequency communication interface of the radio frequency switch matrix through a coaxial cable, and is used for sending or receiving the radio frequency signal of the reader module; the radio frequency switch matrix control interface is connected to the radio frequency switch control interface of the radio frequency switch matrix through a control line, and is used for receiving the switch on / off control signal of the reader module.

[0050] Refer to Figure 2 and Figure 4 As shown, the number of the first radio frequency switches is two, namely an all-four radio frequency switch B and an all-four radio frequency switch C. The four coaxial interfaces of the all-four radio frequency switch B and the all-four radio frequency switch C are respectively connected to 4 RFID antennas on the left and right sides of the shelf through coaxial cables. The second radio frequency switch is an all-two radio frequency switch A.

[0051] After receiving the detection instruction from the host computer, when different high and low levels are respectively input through the control lines of the all-two radio frequency switch A by the reader module, the all-two radio frequency switch A switches the radio frequency signal to the corresponding all-four radio frequency switch B or all-four radio frequency switch C, that is, switches to the radio frequency signal transmission link on the left or right side of the shelf, and then uses the first radio frequency switch to sequentially turn on one of the radio frequency signal transmission links.

[0052] Such as Figure 3As shown, after the reader module receives a detection instruction, its transmitting port transmits a part of the activation signal to the RFID tag through the radio frequency signal transmission link on one side of the specified layer of the shelf, and the remaining part of the activation signal is returned to the detection port of the reader module for forward detection to detect whether the power value of the transmitting link is within the normal range; receives the radio frequency signal generated after the RFID tag is activated through the specified radio frequency signal transmission link, and sends it to the host computer as the first detection result via the reader module, completing one round of RFID tag detection;

[0053] The radio frequency signal is switched to the radio frequency signal transmission link on the other side of the same layer of the shelf by switching the radio frequency switch matrix, and the received radio frequency signal is returned. It is sent back to the host computer as the second detection result via the reader module. The host computer performs a merging and duplicate removal process on the first detection result and the second detection result to obtain the inventory result of the stored items on each layer of the shelf, and polls the radio frequency signal transmission links on the left and right sides of each layer of the shelf to obtain the detection result of the entire shelf. The above implementation method realizes complementary detection of each layer of RFID tags and reduces the missed detection rate of RFID tags.

[0054] Embodiment 2

[0055] For double-row side-by-side shelves, the present invention proposes a double-reader collaborative RFID detection method to inventory the items on the shelf. Double-reader collaboration means that the readers are different from the previous independent working methods of two readers. Instead, at a certain moment, only one reader serves as the master reader, transmitting an activation RFID electromagnetic wave and receiving the RFID signal at the same time, while the other reader serves as the slave reader and only receives the RFID signal without transmitting an activation RFID electromagnetic wave.

[0056] Figure 5 Figure is a schematic diagram of realizing the detection of items on the same layer of a single shelf in the double-reader collaborative working mode, where the reader used is Figure 3 the transceiver integrated reader shown. Figure 5 (a), reader R1 is the master reader, transmitting the electromagnetic wave used to activate the RFID tag and receiving the echo signal of the tag at the same time, while reader R2 is the slave reader and only receives the echo signal of the tag; Figure 5 (b), reader R1 is the slave reader and only receives the echo signal of the tag, while reader R2 is the master reader, transmitting the electromagnetic wave used to activate the RFID tag and receiving the electromagnetic wave signal of the tag at the same time. The double-reader collaborative working mode can avoid the mutual interference caused by readers transmitting activation RFID electromagnetic waves at the same time, and form a space-division multiplexing method for reading RFID tags to solve the tag collision problem, realizing the dual collaborative detection of one transmission and two receptions of items on the same layer of the shelf, improving the accuracy of RFID detection and reducing the missed detection rate.

[0057] Specifically, according to the different master-slave collaborative notification methods of the reader, the present invention also provides a collaborative detection device for stored items based on radio frequency identification, and designs two schemes as shown in Figure 6 and Figure 7 shown, including:

[0058] Multiple RFID antennas, which are installed on both sides of multiple rows of shelves;

[0059] Multiple radio frequency switch matrices, each radio frequency switch matrix includes multiple first radio frequency switches and a single second radio frequency switch. Among them, at least one of the first radio frequency switches is connected to the RFID antennas on the same side of any row of shelves, and the connection channels between the two constitute multiple radio frequency signal transmission links. The first radio frequency switch is used for radio frequency signal transmission links of different rows; the second radio frequency switch can switch the first radio frequency switches;

[0060] Multiple RFID reader main control boards, the RFID reader main control boards are connected to the radio frequency switch matrices, and the number of the RFID reader main control boards is the same as the number of the radio frequency switch matrices;

[0061] And a host computer, the host computer is connected to the RFID reader main control board;

[0062] Among them, the host computer sends a detection instruction to the RFID reader main control board. In the host computer control collaborative mode or the external interrupt control collaborative mode, after receiving the detection instruction, the RFID reader main control board selects any radio frequency signal transmission link through the radio frequency switch matrix to broadcast an activation signal to the RFID tags on the shelves, and receives the radio frequency signal containing item information generated after the RFID tags are activated. The RFID reader main control board sends the radio frequency signal to the host computer to obtain the detection result of the items on the shelves.

[0063] Furthermore, each RFID reader main control board includes a reader module, a radio frequency switch matrix control interface, and a radio frequency signal transmission interface; among them, the reader module is communicatively connected to the host computer through a 485 bus, the radio frequency signal transmission interface is connected to the radio frequency communication interface of the radio frequency switch matrix through a coaxial cable, and is used to send the radio frequency signal of the reader module or receive the backhaul radio wave; the radio frequency switch matrix control interface is connected to the radio frequency switch control interface of the radio frequency switch matrix through a control line, and is used to receive the switch on / off control signal of the reader module.

[0064] In this embodiment, the number of the main control boards of the RFID readers and the radio frequency switch matrices is two each, and the two are connected in one-to-one correspondence. The main control board of the RFID reader includes a reader module R1 and a reader module R2, the radio frequency switch matrix includes a radio frequency switch matrix RF1 and a radio frequency switch matrix RF2, and the reader module R1 is connected to the radio frequency switch matrix RF1, and the reader module R2 is connected to the radio frequency switch matrix RF2.

[0065] Referring to Figure 4 , Figure 6 and Figure 7 As shown, each radio frequency switch matrix includes two first radio frequency switches (i.e., one-for-four radio frequency switches B and C) and one second radio frequency switch (i.e., one-for-two radio frequency switch A). The one-for-four radio frequency switches B and C are each equipped with four coaxial interfaces, and these interfaces are physically connected to four RFID antennas on the left and right sides of the shelf through coaxial cables respectively, so as to construct multiple independently controllable radio frequency signal transmission links in the spatial layout. This design ensures the flexibility and accuracy of signal transmission, and supports efficient and interference-free identification and monitoring of RFID tags.

[0066] After the reader module receives the detection instruction from the host computer, when different high and low levels are respectively input through the control line of the one-for-two radio frequency switch A, the one-for-two radio frequency switch A switches the radio frequency signal to the corresponding one-for-four radio frequency switch B or one-for-four radio frequency switch C, that is, switches to the radio frequency signal transmission link on the left or right side of the shelf, and then uses the first radio frequency switch to sequentially turn on the radio frequency signal transmission link of one specified layer of the shelf. Through such a control process, the system can flexibly switch the radio frequency signal between different areas of the shelf to achieve efficient detection and identification of RFID tags.

[0067] The method for setting the host computer control cooperation mode includes: the host computer arbitrarily selects a reader module to be configured as the master reader, and the other reader is configured as the slave reader. The master reader emits an activation signal to the RFID tag through the radio frequency signal transmission link on one side of the specified layer of the shelf, and the master reader and the slave reader synchronously receive the radio frequency signal after the tag is activated;

[0068] After the detection work in the master-slave reader working mode is completed once, the host computer configures the current slave reader as the master reader, and the current master reader as the slave reader. The newly configured master reader emits an activation signal to the RFID tag through the radio frequency signal transmission link on one side of the specified layer of the shelf, and the master reader and the slave reader synchronously receive the radio frequency signal after the tag is activated.

[0069] Specifically, referring to Figure 6 andFigure 7 As shown, in the host computer control collaborative mode, before performing polling detection, the host computer initializes the system and sets the polling time. The reader module R1 and the reader module R2 each complete the initialization process and enter the standby state, waiting for the next instruction issued by the host computer.

[0070] Once the host computer sends a polling detection command, the system immediately enters the polling detection working state. In this mode, the host computer first sends a detection instruction to the reader module R1 and the reader module R2, instructing them to detect the first layer of the first row of shelves. After receiving the instruction, the reader module R1 and the reader module R2 respectively perform programmed control operations on the RF switch matrix RF1 and the RF switch matrix RF2 associated with them, accurately configure and conduct the RF signal transmission link of the corresponding layer, and ensure that the RF signal can be smoothly transmitted to the target RFID tag.

[0071] Next, the host computer executes the collaborative working mode, configures the reader module R1 as the master reader, and configures the reader module R2 as the slave reader. Under this configuration, the master reader R1 transmits an activation signal to the RFID tag through the RF signal transmission link on one side of the shelf, triggering its response mechanism. At the same time, the master reader R1 and the slave reader R2 both maintain a receiving state, synchronously capturing and receiving the RF signal returned by the RFID tag, which includes the item tag information.

[0072] Subsequently, the master reader R1 and the slave reader R2 upload the tag information they have collected to the host computer. After receiving the tag information from the two readers, the host computer merges and removes duplicates from the initial collaborative detection data to ensure the accuracy and uniqueness of the data.

[0073] After the first merging and deduplication is completed, the host computer performs a master-slave mode switching operation, configuring R2 as the master reader and R1 as the slave reader. The new master reader R2 is responsible for emitting electromagnetic waves to activate the RFID tag, and R1 and R2 synchronously receive the tag signal again to perform RFID tag detection. After the detection is completed, the two readers report the results to the host computer, which again uses the deduplication algorithm to process the data of the secondary collaborative detection. The combined deduplication results of the two collaborative detections are further integrated, and the deduplication operation is performed again, and finally a complete and non-redundant detection result of the first layer of the first row of smart shelves is generated.

[0074] After completing the first layer of detection, the system will continue to poll the second, third, and fourth layers one by one until the detection tasks of all levels of the first row of smart shelves are completed. Then, the system will continue to poll each layer of the second row of smart shelves until all items in the two rows of parallel smart shelves have completed RFID detection without interference and with dual readers.

[0075] After the end of the entire polling detection cycle, the reader modules R1 and R2 automatically return to the waiting state, waiting for the host computer to issue a new detection command according to the preset polling time interval, and then cycling into the next polling detection cycle.

[0076] In summary, adopting the master-slave switching working mode of the reader cleverly solves the mutual interference problem when the readers work independently. Moreover, through the "one-transmission and two-reception" detection mechanism, not only the signal coverage range and reception sensitivity are enhanced, but also the signal paths are effectively dispersed through the spatial space-division multiplexing effect, significantly reducing the collision probability between RFID tags.

[0077] Further, the setting method of the external interrupt control cooperation mode includes: the reader modules R1 and R2 are interconnected through two signal lines, the host computer arbitrarily configures one reader module as the master reader, the master reader sends an interrupt signal to the other reader module through the signal line to configure it as the slave reader, the master reader transmits an activation signal to the RFID tag through the radio frequency signal transmission link on one side of the specified layer of the shelf, and the master reader and the slave reader synchronously receive the radio frequency signal after the tag is activated;

[0078] After the detection work of the slave reader module is completed, the slave reader module is configured as the new master reader, and the new master reader sends an interrupt signal to the original master reader module to switch it into the new slave reader.

[0079] Specifically, referring to Figure 8 and Figure 9 As shown, in the external interrupt control cooperation mode, before starting the polling detection, the host computer performs system initialization and sets the polling time. The reader modules R1 and R2 each complete the initialization process and enter the standby state, waiting for the next instruction issued by the host computer.

[0080] Once the host computer sends a polling detection command, the system immediately enters the polling detection working state. In this mode, the host computer sends the detection instruction for the first layer of the first row of shelves to the reader modules R1 and R2. After receiving the detection instruction, the reader modules R1 and R2 respectively control the radio frequency switch matrices RF1 and RF2 to ensure that the radio frequency signal transmission link of the corresponding layer is turned on during the detection process.

[0081] First, the host computer configures the reader module R1 as the master reader. The master reader R1 transmits an activation signal to the RFID tag through the radio frequency signal transmission link on the first layer of the first row of shelves, and at the same time sends an interrupt signal to the reader module R2 through the signal line to configure it as a slave reader. Then, the master and slave dual readers synchronously receive the radio frequency signals generated by the activation of the tag to complete the RFID tag detection of one transmission and two receptions. The master reader R1 and the slave reader R2 upload the successfully read RFID tag information to the host computer, and the host computer performs the first merging and deduplication process on the tag information.

[0082] After the reader module R2, as the slave reader, completes the tag upload, it switches the reader module R1 to a new slave reader through the signal line, and itself switches to a new master reader. The new slave reader R1 turns off the radio frequency signal for activating the RFID tag, and the new master reader R2 transmits an activation signal to the RFID tag through the radio frequency signal transmission link on the first layer of the first row of shelves. Subsequently, the master and slave dual readers synchronously receive the radio frequency signals generated by the activation of the tag to complete another RFID tag detection of one transmission and two receptions. The new slave reader R1 and the new master reader R2 upload the successfully read RFID tag information to the host computer, and the host computer performs the second merging and deduplication on the tag information. Finally, the host computer performs another merging and deduplication process on the results after the two collaborative detections are merged and deduplicated to ensure a complete and accurate detection result of the items on the first layer of the first row of intelligent shelves.

[0083] After completing the double collaborative detection of the items on the first layer of the first row of shelves, the system continues to sequentially poll the tag detections on the second layer, the third layer, and the fourth layer until all levels of the first row of shelves are detected. Subsequently, the second row of shelves is detected according to the same process until all the detection tasks of the double-row parallel shelves are completed.

[0084] After all the polling detections are completed, the reader module R1 and the reader module R2 enter the waiting state. When the host computer sends a new polling command according to the set polling time, the system starts the next round of detection work, thereby realizing continuous and periodic RFID tag detection.

[0085] In summary, this external interrupt control collaborative mode, through the flexible switching and collaborative work of the dual readers, and multiple merging and deduplication processes, not only improves the detection efficiency and accuracy of RFID tags, but also significantly reduces the missed detection rate through the collaborative work of the dual readers and multiple merging and deduplication processes, providing reliable technical support for scenarios such as intelligent warehousing and logistics management.

[0086] Embodiment 3

[0087] The present invention also provides an intelligent shelf, which includes the collaborative detection device for stored items based on radio frequency identification described in Embodiment 1 or Embodiment 2. Among them, the structures and functions of the components in the stored item detection device are the same as those in Embodiment 1 or Embodiment 2, so they will not be elaborated in this embodiment.

[0088] By integrating the collaborative detection device for stored items based on radio frequency identification, the intelligent shelf realizes the intelligent and automated management of storage items. Its efficient and accurate detection ability and collaborative working mechanism bring significant improvement and convenience to the storage industry.

[0089] Obviously, the above embodiments are only examples for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A collaborative detection device for stored items based on radio frequency identification, characterized in that, Manage items on multi-row parallel shelves. All items are equipped with RFID tags. The device includes: Multiple RFID antennas, which are installed on both sides of the multi-row shelves; Multiple RF switch matrices, each RF switch matrix includes multiple first RF switches and a single second RF switch. Among them, at least one of the first RF switches is connected to the RFID antennas on the same side of any row of shelves, and the connection channels between them form multiple independently controllable RF signal transmission links. The first RF switch is used for the RF signal transmission link on the same side of the multi-row shelves; the second RF switch can switch the first RF switch; Multiple RFID reader main control boards, which are connected to the RF switch matrices, and the number of the RFID reader main control boards is the same as the number of the RF switch matrices; And a host computer, which is connected to the RFID reader main control board; Among them, the host computer sends a detection instruction to the RFID reader main control board. In the host computer control cooperation mode or the external interrupt control cooperation mode, after receiving the detection instruction, the RFID reader main control board selects any RF signal transmission link through the RF switch matrix to broadcast the activation signal to the RFID tags on the shelves, and receives the RF signal containing item information generated after the RFID tags are activated. The RFID reader main control board sends the RF signal to the host computer, and the host computer obtains the item detection result on the shelves; The number of the RFID reader main control boards is two. Each RFID reader main control board includes a reader module, and the reader module is connected to the host computer; Optionally, one reader module is configured as the main reader, and the other reader is configured as the slave reader. The main reader transmits the activation signal to the RFID tags through the RF signal transmission link on one side of the specified layer of shelves, and the main reader and the slave reader synchronously receive the RF signal after the tag is activated; after the detection work of the slave reader module is completed, the slave reader module is configured as the new main reader, the original main reader module is switched to the new slave reader, and the newly configured main reader transmits the activation signal to the RFID tags through the RF signal transmission link on one side of the specified layer of shelves, and the main reader and the slave reader synchronously receive the RF signal after the tag is activated.

2. The collaborative detection device for stored items based on radio frequency identification according to claim 1, wherein: The number of the RF switch matrices is two, and the RF switch matrices and the RFID reader main control boards are connected one by one. Each RFID reader main control board further includes an RF switch matrix control interface and an RF signal transmission interface; Among them, the RF signal transmission interface is connected to the RF communication interface of the RF switch matrix, and is used for sending the activation signal of the reader module or receiving the RF signal; the RF switch matrix control interface is connected to the RF switch control interface of the RF switch matrix, and is used for receiving the switch on / off control signal of the reader module.

3. The collaborative detection device for stored items based on radio frequency identification according to claim 1, wherein: The method for setting the host computer control cooperation mode includes: The host computer randomly selects one reader module and configures it as the master reader, and configures the other reader as the slave reader.

4. The collaborative detection device for stored items based on radio frequency identification according to claim 3, wherein: The method for setting the host computer control cooperation mode further includes: After the detection work in the master-slave reader working mode is completed once, the host computer configures the current slave reader as the master reader, and configures the current master reader as the slave reader.

5. The collaborative detection device for stored items based on radio frequency identification according to claim 1, wherein: The method for setting the external interrupt control cooperation mode includes: The two reader modules are connected through a signal line. The host computer randomly selects one reader module and configures it as the master reader. The master reader sends an interrupt signal to the other reader module through the signal line to configure it as the slave reader; After the detection work of the slave reader module is completed, the slave reader module is configured as the new master reader, and the new master reader sends an interrupt signal to the original master reader module to switch it into the new slave reader.

6. An intelligent shelf, characterized in that, It includes the collaborative detection device for stored items based on radio frequency identification according to any one of claims 1 to 5.

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