RFID tag fixing device and RFID tag transfer position parameter determination method

Abstract

The invention discloses an RFID (Radio Frequency Identification Device) tag fixing device, which belongs to the field of intelligent manufacturing of rail transit vehicles and comprises a storage box and a fixing frame, the storage box is mounted on the outer side surface of the fixing frame; a storage cavity is formed in the storage box, and a throwing opening communicating with the storage cavity is formed in the top of the storage box; the side wall of the side, back on to the fixing frame, of the storage box is a transparent side wall. According to the invention, the RFID tag can be conveniently and quickly fixed and the efficiency is high when the RFID tag is transferred among the working procedures in the assembly line of the railway vehicle. The invention further discloses an RFID tag transfer position parameter determination method, the attitude angles and the power of all RFID tags and reader-writers on a production line are rapidly set, the transfer fixing operation is simple and convenient, and the data reading reliability is high.

Description

Technical Field

[0001] The present invention belongs to the field of intelligent manufacturing of rail transit vehicles, and more specifically, relates to an RFID tag fixing device. Background Art

[0002] When a rail vehicle is transferred through various processes on the general assembly production line, in order to monitor the real-time position of the rail vehicle, an RFID tag is usually fixed to the vehicle underframe. The RFID tag is usually fixed to the underframe of the rail vehicle in the form of bolts and nuts, and the rail vehicle carries the RFID tag and is transferred simultaneously.

[0003] During the production and processing of the underframe of the rail vehicle, considering that there are many operations under the vehicle and the working environment is complex, it is very easy to lose or block the RFID tag, resulting in the reader not being able to read the RFID tag well.

[0004] In view of this, the present invention is specifically proposed. Summary of the Invention

[0005] In order to solve at least some of the above problems, the present invention provides an RFID tag fixing device, which can facilitate the reader to read and write the RFID tag when the RFID tag is transferred between various processes in the assembly line of a railway vehicle.

[0006] The basic concept of the technical solution adopted by the present invention is:

[0007] An RFID tag fixing device includes a storage box and a fixing frame;

[0008] The storage box is installed on the outer surface of the fixing frame;

[0009] A storage cavity is provided inside the storage box, and a feeding port communicating with the storage cavity is provided at the top of the storage box;

[0010] The side wall of the storage box facing away from the fixing frame is a transparent side wall.

[0011] Further, the fixing frame includes a left half and a right half, the left half and the right half are buckled to form an annular structure, and the left half and the right half are detachably connected.

[0012] Further, at the position where the left half and the right half are butted, a first folding portion extending outward is provided on the left half;

[0013] A second folding portion extending outward is provided on the right half;

[0014] The first folding part and the second folding part are attached to each other, and the first folding part and the second folding part are detachably connected by a fastener.

[0015] Further, the fixing frame includes a horizontal plate arranged horizontally, and two vertical plates extending vertically downward are arranged below the horizontal plate. The vertical plates are connected to the horizontal plate, and the storage box is installed on the outer side wall surface of one of the vertical plates.

[0016] Further, a through hole communicating with the storage cavity is arranged on the side wall of the storage box;

[0017] Preferably, the through hole is an oblong hole, and the extending direction of the oblong hole is vertically arranged.

[0018] Further, anti-collision edges are arranged at the left and right corners of the bottom of the side of the storage box away from the fixing frame, and the anti-collision edges wrap the left and right corners of the bottom of the side of the storage box away from the fixing frame inside;

[0019] Preferably, the anti-collision edges are metal anti-collision edges.

[0020] Further, the storage box is detachably connected to the fixing frame.

[0021] Further, the storage box is a transparent acrylic storage box.

[0022] The second object of the present invention is to provide a method for determining the position parameters of RFID tag circulation.

[0023] The basic concept of the technical solution adopted by the present invention is:

[0024] A method for determining the position parameters of RFID tag circulation, which is applied to the general assembly production line of rail vehicles, includes the following steps:

[0025] S1. Establish a coordinate system for the general assembly production line;

[0026] S2. Define the coordinates of the station positions on the general assembly production line;

[0027] S3. Set the recognition distance of the reader-writer;

[0028] S4. Design the vehicle circulation form, and install the RFID on the gantry truck by using the RFID tag fixing device described above;

[0029] S5. Obtain the attitude angle of the reader-writer and the antenna transmission power;

[0030] S6. Solve the tag positions, the attitude angles of the reader-writers, and the transmission frequencies of the reader-writers at all station positions on the production line.

[0031] Further, in step S5 of obtaining the attitude angle of the reader and the antenna transmission power, the following steps are included:

[0032] S5.1 Establish a half-vehicle model of the RFID tag and the reader;

[0033] S5.2 Solve the position coordinates of the RFID tag according to the position coordinates of the center point of the reader and the position coordinates of the center point of the vehicle;

[0034] S5.3 Calculate the attitude angle of the reader and the antenna transmission power according to the center point coordinates of the reader and the position coordinates of the RFID tag.

[0035] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0036] 1. It realizes the rapid calculation of the position coordinates, attitude angle and power of all RFID tags on the production line, which is convenient for on-site operators to quickly find the position of RFID tags and set the attitude angle and power of the reader. It is applicable not only to the working conditions of single vehicle model flow on the production line, but also to the working conditions of mixed flow of different vehicle models on the production line, with a wide range of applications.

[0037] 2. When the RFID tag is in circulation, the RFID tag can always be located inside the storage box, and the reader can directly read and write the RFID tag located inside the storage box from the outside of the storage box.

[0038] 3. Since the RFID tag is always inside the storage box, it is not easy to damage the RFID during the production process, and it can play the role of protecting the RFID.

[0039] 4. When the RFID tag is in circulation, it can quickly install the RFID tag at the specified position. Compared with the fixing method of bolts and nuts, the installation method of the RFID tag is simple and fast, and the installation efficiency is high.

[0040] The following further describes in detail the specific implementation manners of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, as a part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation to the present invention. Obviously, the accompanying drawings in the following description are only some embodiments, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts. In the drawings:

[0042] Figure 1 is a schematic structural diagram of the RFID tag fixing device according to Embodiment 1 of the present invention;

[0043] Figure 2 It is a schematic diagram of the bottom structure of the RFID tag fixing device according to the first embodiment of the present invention;

[0044] Figure 3 It is a schematic diagram of the anti-collision edge structure of the RFID tag fixing device in the present invention;

[0045] Figure 4 It is a schematic diagram of the RFID tag fixing device according to the second embodiment of the present invention;

[0046] Figure 5 It is a schematic diagram of the RFID tag fixing device according to the third embodiment of the present invention;

[0047] Figure 6 It is a flowchart of the method for determining the RFID tag transfer position parameters;

[0048] Figure 7 It is the station position coordinates of the track vehicle general assembly production line;

[0049] Figure 8 It is a schematic diagram of the reader recognition range;

[0050] Figure 9 It is a schematic diagram of the connection structure between the bogie and the RFID tag fixing device on the track vehicle general assembly production line;

[0051] Figure 10 It is a flowchart of obtaining the reader attitude angle and antenna transmission power;

[0052] Figure 11 It is a position relationship diagram between the RFID tag and the reader.

[0053] In the figure: 1. Storage box; 101. Fixed plate; 102. Box body; 1021. First plate body; 1022. Second plate body; 1023. Third plate body; 11. Storage cavity; 12. Through hole; 2. Fixed frame; 21. Left half; 211. First horizontal plate; 212. First support arm; 213. First folding part; 22. Right half; 221. Second horizontal plate; 222. Second support arm; 223. Second folding part; 23. Horizontal plate; 24. Vertical plate; 3. Anti-collision edge; 31. Bottom protection part; 32. First side protection part; 33. Second side protection part; 34. Connection part; 4. Bogie column; 5. Reader.

[0054] It should be noted that these drawings and text descriptions are not intended to limit the scope of the concept of the present invention in any way, but to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0055] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0056] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0057] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] As Figures 1 to 5 shown, the present invention discloses an RFID tag fixing device.

[0059] Embodiment 1

[0060] During the transfer process of the vehicle on the pre-installation production line, the vehicle is supported by two trolleys and is pulled backward by a rail-road dual-purpose vehicle towing the trolley.

[0061] Referring Figures 1 to 3 , the RFID tag fixing device includes a storage box 1 and a fixing frame 2. The storage box 1 is fixed to the outer surface of the fixing frame 2 by bolts. The storage box 1 is used to place RFID tags, and the fixing frame 2 is used to connect to the support column of the trolley, thereby fixing the RFID tag to the support column of the trolley.

[0062] In this embodiment, the storage box 1 is an acrylic storage box integrally processed from transparent acrylic material. The interior of the storage box 1 is provided with a storage cavity 11 for placing RFID tags. A feeding port is provided at the top of the storage cavity 11, and the feeding port is communicated with the storage cavity 11 inside the storage box 1. When the RFID tag is placed inside the storage box 1, the RFID passes through the feeding port and enters the interior of the storage cavity 11.

[0063] Since the storage box 1 is a transparent acrylic storage box, when the RFID tag is placed inside the storage cavity 11, the RFID tag placed inside the storage cavity 11 can be seen from the outside of the side wall of the storage box 1 away from the fixing frame 2. The reader-writer can directly read and write the RFID tag stored inside the storage cavity 11 from the outside of the storage box 1.

[0064] A through hole 12 penetrating the side wall of the storage box 1 is formed in the side wall of the storage box 1 facing away from the fixing frame 2, and the through hole 12 communicates with the inside of the storage cavity 11. The through hole 12 is an oblong hole, and the extending direction of the through hole 12 is vertically arranged. By providing the through hole 12, when the RFID tag is taken out from the storage cavity 11, the finger is inserted into the inside of the storage cavity 11 through the through hole 12, so that the finger can touch the RFID tag located inside the storage cavity 11. When the finger touches the RFID tag, the finger can push the RFID tag upward to make the RFID tag push out from the feeding port at the top of the storage box 1.

[0065] Preferably, the number of the through holes 12 is two, and the two through holes 12 are horizontally arranged at intervals from the left side to the right side of the side wall of the storage box 1 facing away from the fixing frame 2.

[0066] Specifically, the storage box 1 includes a fixing plate 101 attached to the outer surface of the fixing frame 2, and the fixing plate 101 is fixed to the fixing frame 2 by bolts. A box body 102 is arranged on the side of the fixing plate 101 facing away from the fixing frame 2, and the box body 102 is integrally formed or adhesively fixed to the fixing plate 101.

[0067] The box body 102 includes a first plate body 1021 spaced parallel to the fixing plate 101. Second plate bodies 1022 extending in the direction of the fixing plate 101 are respectively arranged at the left and right ends of the first plate body 1021. One end of the second plate body 1022 is connected to the first plate body 1021, and the other end of the second plate body 1022 is connected to the fixing plate 101. A third plate body 1023 extending in the direction of the fixing plate 101 is arranged at the bottom end of the first plate body 1021. One end of the third plate body 1023 is connected to the first plate body 1021, and the other end of the third plate body 1023 is connected to the fixing plate 101.

[0068] The length of the fixing plate 101 is greater than the length of the first plate body 1021, and the width of the fixing plate 101 is greater than the width of the first plate body 1021. The height of the top end face of the first plate body 1021 is lower than the height of the top end face of the fixing plate 101.

[0069] There is a distance between the vertical projection of the left end face of the first plate body 1021 towards the fixed plate 101 and the left end face of the fixed plate 101. The vertical projection of the right end face of the first plate body 1021 towards the fixed plate 101 and the fixed plate 101. The vertical projection of the left end face of the first plate body 1021 towards the fixed plate 101 and the vertical projection of the right end face of the first plate body 1021 towards the fixed plate 101 are both located on the side surface of the fixed plate 101 facing the first plate body 1021.

[0070] Preferably, the first plate body 1021, the second plate body 1022 and the third plate body 1023 are integrally formed.

[0071] The through hole 12 is opened on the first plate body 1021.

[0072] In this embodiment, anti-collision edges 3 are provided at the left and right corners of the bottom of the side of the storage box 1 away from the fixing frame 2, and the anti-collision edges 3 wrap the left and right corners of the bottom of the side of the storage box 1 away from the fixing frame 2 inside. The anti-collision edges 3 are anti-collision edges made of a metal material, such as stainless steel.

[0073] Specifically, the anti-collision edge 3 includes a bottom protection part 31 that fits the outer surface of the third plate body 1023, a first side protection part 32 that fits the outer surface of the first plate body 1021, a second side protection part 33 that fits the outer surface of the second plate body 1022, and a connecting part 34 that fits on the surface of the fixing plate 101. The connecting part 34 is fixed to the fixing plate 101 by bolts. The bottom protection part 31, the first side protection part 32, the second side protection part 33 and the connecting part 34 are integrally formed.

[0074] Preferably, the connection areas between the first side protection part 32 and the second side protection part 33 are all arc-shaped.

[0075] In this embodiment, the fixing frame 2 includes a left half 21 and a right half 22. When the left half 21 and the right half 22 are buckled together, the left half 21 and the right half 22 are assembled into an annular structure. The left half 21 and the right half 22 are connected together by bolts. The storage box 1 is connected to one of the left half 21 or the right half 22. Both the left half 21 and the right half 22 are made of a metal material, such as stainless steel.

[0076] Specifically, the left half 21 includes a first horizontal plate 211 in a rectangular shape. At both ends of the first horizontal plate 211, there are respectively provided first support arms 212 extending in the lateral direction of the first horizontal plate 211 and perpendicular to the first horizontal plate 211. The extending directions of the first support arms 212 at both ends of the first horizontal plate 211 are the same. At the end of the first support arm 212 away from the first horizontal plate 211, there is provided a first folding portion 213 folding in the direction away from the other first support arm 212. The first folding portion 213 is perpendicular to the first support arm 212.

[0077] Preferably, the first horizontal plate 211, the first support arm 212, and the first folding portion 213 are formed by bending a whole piece of plate material.

[0078] Specifically, the right half 22 includes a second horizontal plate 221 in a rectangular shape. At both ends of the second horizontal plate 221, there are respectively provided second support arms 222 extending in the lateral direction of the second horizontal plate 221 and perpendicular to the second horizontal plate 221. The extending directions of the second support arms 222 at both ends of the second horizontal plate 221 are the same. At the end of the second support arm 222 away from the second horizontal plate 221, there is provided a second folding portion 223 folding in the direction away from the other second support arm 222. The second folding portion 223 is perpendicular to the second support arm 222.

[0079] Preferably, the second horizontal plate 221, the second support arm 222, and the second folding portion 223 are formed by bending a whole piece of plate material.

[0080] When the left half 21 and the right half 22 are buckled and assembled, the first horizontal plate 211 of the left half 21 and the second horizontal plate 221 of the right half 22 are parallel to each other. The first support arms 212 at both ends of the first horizontal plate 211 and the second support arms 222 at both ends of the second horizontal plate 221 are opposite to each other one by one and are butted together. When the first support arm 212 and the second support arm 222 are butted, the first folding portion 213 and the second folding portion 223 are in contact with each other. The first folding portion 213 and the second folding portion 223 are fixed together by bolts.

[0081] When connecting the fixing frame 2 to the support column of the trolley, first loosen the bolts connecting the first folding portion 213 and the second folding portion 223 to separate the left half 21 and the right half 22. Then, make the left half 21 and the right half 22 hold the support column of the trolley, and then connect the first folding portion 213 and the second folding portion 223 by bolts to make the left half 21 and the right half 22 hold the support column of the trolley tightly, so that the fixing frame 2 can be connected to the support column of the trolley.

[0082] Embodiment Two

[0083] Refer to Figure 4 The difference between Embodiment Two and Embodiment One lies in the different structures of the fixing frame 2.

[0084] In this embodiment, the fixing frame 2 includes a horizontal plate 23 arranged horizontally. Below the horizontal plate 23, there are two vertical plates 24 extending vertically downward, and the two vertical plates 24 are parallel to each other. There is a distance between the two vertical plates 24. The two vertical plates 24 and the horizontal plate 23 are bent from a whole stainless steel plate. The storage box 1 is fixed on the outer surface of one of the vertical plates 24.

[0085] When the RFID tag needs to be transferred to the post-assembly production line, the fixing frame 2 in the second embodiment can be used to install the RFID tag on the cross column of the overall bracket. To increase the stability of the fixing frame 2, the fixing frame 2 can also be connected to the cross column of the overall bracket by bolts.

[0086] Embodiment Three

[0087] Refer to Figure 5 , the difference between Embodiment Three and Embodiment One is that the first plate body 1021 of the storage box 1 is a transparent acrylic plate, and the second plate body 1022, the third plate body 1023 and the fixing plate 101 are all stainless steel plates. The first plate body 1021 is adhesively fixed to the second plate body 1022 and the third plate body 1023.

[0088] The present invention also discloses a method for determining the transfer position parameters of RFID tags, which is applied to the general assembly production line of rail vehicles.

[0089] Refer to Figure 6 , the method for determining the transfer position parameters of RFID tags includes the following steps:

[0090] S1. Establish a coordinate system for the general assembly line.

[0091] Specifically, establish the earth coordinate system XYZ of the railway vehicle general assembly line, with the coordinate origin being 0. The X-axis direction is perpendicular to the track direction of the railway vehicle general assembly line, the Y-axis direction is along the track direction of the railway vehicle general assembly line, and the X0Y plane is located on the earth plane. The Z-axis direction is perpendicular to the X0Y plane and upward, representing height coordinate information.

[0092] S2. Define the position coordinates of the stations on the general assembly production line.

[0093] As Figure 7 shown, arrange several tracks along the X direction of the earth coordinate system XYZ, and the track numbers range from 1 to n along the X-axis direction. The extending direction of the tracks extends along the Y-axis direction, and several stations are arranged along the Y-axis direction, and the station numbers range from 1 to m along the Y-axis direction.

[0094] Set the center point S of the station, XS represents the coordinate value of the station center point on the X-axis, and YS represents the coordinate value of the station center point on the Y-axis.

[0095] The naming rule for the station number is as follows:

[0096] For example, for the station located at track i and work station j, its station number is named as track i, position j. For the station with the station number of track i, position j, the coordinate parameters related to this station are appended with the subscript ij under its coordinate parameters to indicate the station position attribute.

[0097] In the X0Y plane of the coordinates, the coordinates of the center point S of the station numbered as track i, position j are (XS ij , YS ij , 0), and the coordinate data of the center point S of all stations on the general assembly production line are obtained.

[0098] S3. Set the recognition distance of the reader-writer.

[0099] Referring to Figure 8 , when the reader-writer 5 is installed, the reader-writer 5 is installed on the station column 4, and the center point R of the reader-writer 5 and the normal vector perpendicular to the surface of the reader-writer 5 As Figure 7 shown, the recognition range of the reader-writer 5 is the fan-shaped area ERF, and the maximum recognition distance of the reader-writer 5 is RC. The maximum recognition distance RC is mainly related to two parameters, namely the maximum distance R at which the RFID tag can obtain sufficient activation power from the reader-writer 5 tag (RFID tag activation distance) and the maximum distance R at which the reader-writer 5 can detect the backscattered signal of the RFID tag read , and the effective recognition distance of the reader-writer 5 takes the minimum value min(R tag , R read ).

[0100] According to the power transmission equation, and comprehensively considering the reading sensitivity P of the RFID tag chip Chip-th , the power transmission coefficient η maching , the antenna polarization efficiency η antenna , and the radiation efficiency η of the RFID tag antenna polarisation , then the RFID tag activation distance is expressed as:

[0101]

[0102] The meanings of the parameters in the above formula are as follows:

[0103] R tag is the RFID tag activation distance;

[0104] λ is the electromagnetic wave wavelength;

[0105] P t is the transmitting power of the reader-writer antenna;

[0106] Gt is the gain of the reader transmitting antenna;

[0107] G r is the gain of the RFID tag receiving antenna;

[0108] P Chip-th is the reading sensitivity of the RFID tag chip;

[0109] η maching is the power transfer coefficient;

[0110] η antenna is the radiation efficiency of the RFID tag antenna;

[0111] η polarisation is the polarization efficiency of the antenna.

[0112] According to the radar range equation, and comprehensively considering the radar cross-section difference ΔRCS and the sensitivity P of the reader to receive the reflected signal read-th , the maximum distance at which the reader 5 can detect the RFID tag backscattered signal is expressed as:

[0113]

[0114] The meanings of the parameters in the above formula are as follows:

[0115] R read is the maximum distance of the RFID tag backscattered signal;

[0116] ΔRCS is the radar cross-section difference;

[0117] P read-th is the sensitivity of the reader to receive the reflected signal.

[0118] When a specific reader 5 is selected, the maximum identification distance can be changed by changing the value of P t (the transmitting frequency of the reader antenna), and other variables are defaulted to constants. P t determines the maximum reading distance RC of the reader 5. When the maximum reading distance RC of the reader 5 is a known value, P t can be inversely calculated.

[0119] S4. Design the vehicle flow form and install the RFID on the gantry vehicle through the RFID tag fixing device.

[0120] Refer to Figure 9, an RFID tag fixing device is provided on the gantry vehicle, and the RFID tag fixing device adopts the RFID tag fixing device disclosed in Embodiment 1 or Embodiment 3 of the present invention. The RFID tag can be fixed by placing it inside the storage box. During the vehicle circulation process, the RFID tag is fixed in the device, and by reasonably setting the position and attitude angle of the reader 5, the reader 5 can effectively read the RFID tag during the circulation process of the RFID tag.

[0121] S5. Obtain the attitude angle of the reader and the antenna transmission power according to the position of the RFID tag.

[0122] Refer to Figure 10 , obtaining the attitude angle of the reader and the antenna transmission power according to the position of the RFID tag includes the following steps:

[0123] S5.1. Establish a half-vehicle model of the RFID tag and the reader 5.

[0124] Refer to Figure 11 , as shown, when the vehicle is at the position of the i-th track and the j-th position, it can be considered that the center point V of the vehicle coincides with the center point S of the position in the coordinate system XOY. In the geodetic coordinate system XYZ, the position coordinates of the center point of the vehicle are (XS ij , YS ij , 0), and a vehicle coordinate system XVY is established. Select the half-vehicle model of the vehicle for analysis. Figure 11 The meanings and parameters of each point in

[0125] B represents the center point of the gantry vehicle.

[0126] R represents the center point of the reader.

[0127] T represents the center point of the RFID tag.

[0128] represents the reading normal vector of the reader.

[0129] θ represents the angle between the normal vector of the reader and the Y-axis.

[0130] LRT represents the distance between the reader R and the RFID tag T.

[0131] VB represents half of the center distance of the vehicle bogie.

[0132] TB represents half of the center distance between the two support columns of the gantry vehicle.

[0133] H t represents the height of the center of the RFID tag storage device on the support column of the gantry vehicle.

[0134] S5.2 Solve the position coordinates of the RFID tag.

[0135] To improve the reading efficiency of the reader 5 and the convenience of attitude angle adjustment, the reader 5 and the RFID tag are placed at the same height. For the station with the station number of i-th track and j-th position, the position coordinates of the reader 5 are (XR ij , YR ij , H t ). The reader 5 is installed on the column near the station. Here, it is assumed that the side length of the station column 4 and the length of the installation bracket of the reader 5 are negligible, so the positions of the reader 5 and the station column 4 coincide, that is, their coordinate positions are the same. The position coordinates of the vehicle center point are (XS ij , YS ij , 0).

[0136] For the station with the station number of i-th track and j-th position, the position coordinates of the center point of the reader 5 (XR ij , YR ij , H t ) and the position coordinates of the vehicle center point (XS ij , YS ij , 0) are known quantities. Solve the position coordinates of the RFID tag (XT ij , YT ij , ZT ij ). The calculation process of its coordinate values is as follows:

[0137] XT ij = XS ij - TB

[0138] YT ij = YS ij + VB

[0139] ZT ij = H t

[0140] S5.3. Calculate the attitude angle of the reader and the antenna transmission power.

[0141] For the station with the station number of i-th track and j-th position, it is known that the reading normal vector at the center point R of the reader 5 forms an angle θ with the Y-axis, and the coordinates at R and T are known. According to the calculation methods of the slope and length of the straight line RT, solve the θ angle and the values of LRT and P t . The calculation process is as follows:

[0142] (a) Calculation method of the θ angle

[0143]

[0144] It is obtained that

[0145] (b) Calculation method of LRT

[0146]

[0147] (c) Reader antenna transmission frequency P t Calculation method

[0148] Considering the influence of the working conditions around the reader 5 on the reading performance, let the maximum reading distance RC ij = K·LRT ij , and RC ij = min(R tag , R read ).

[0149] According to:

[0150]

[0151] and

[0152] Find P t(ij) .

[0153] K represents the reading distance expansion factor.

[0154] S6. Solve the RFID tag position coordinates, reader attitude angles, and reader antenna transmission frequencies for all stations on the production line.

[0155] Solve the RFID tag position coordinates (XT ij , YT ij , ZT ij ), reader attitude angle θXR ij and reader antenna transmission frequency P t(ij) for all stations (station numbers are i-th row and j-th position, i = 1~n, j = 1~m).

[0156] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art of this patent can make some changes or modifications to the above-mentioned technical content within the scope of the technical solution of the present invention to obtain equivalent embodiments of equivalent changes. The implementation schemes in the above embodiments can also be further combined or replaced. However, as long as it does not depart from the technical content of the present invention, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the present invention's solution.

Claims

1. An RFID tag fixing device, characterized in that: It comprises a storage box (1) and a fixing frame (2); The storage box (1) is mounted on the outer surface of the fixing frame (2); The storage box (1) is provided with a storage cavity (11) inside, and the top of the storage box (1) is provided with a delivery port connected to the storage cavity (11); The side wall of the storage box (1) facing away from the fixing frame (2) is a transparent side wall.

2. The RFID tag fixing device according to claim 1, characterized in that: The fixing frame (2) comprises a left half (21) and a right half (22), wherein the left half (21) and the right half (22) are buckled together to form an annular structure, and the left half (21) and the right half (22) are detachably connected.

3. The RFID tag fixing device according to claim 2, characterized in that: At a position where the left half (21) and the right half (22) are connected to each other, the left half (21) is provided with a first folding portion (213) extending outwards; The right half (22) is provided with a second folding portion (223) extending outwards; The first folded portion (213) and the second folded portion (223) are in contact with each other, and the first folded portion (213) and the second folded portion (223) are detachably connected via a fastener.

4. The RFID tag fixing device according to claim 1, characterized in that: The fixing frame (2) comprises a horizontal plate (23) arranged horizontally, two vertical plates (24) extending vertically downward are arranged below the horizontal plate (23), the vertical plates (24) are connected to the horizontal plate (23), and the storage box (1) is installed on the outer side wall surface of one of the vertical plates (24).

5. The RFID tag fixing device according to claim 1, characterized in that: A through hole (12) communicating with the storage cavity (11) is provided on the side wall of the storage box (1); Preferably, the through hole (12) is an oblong hole, and the extension direction of the oblong hole is arranged vertically.

6. The RFID tag fixing device according to claim 1, characterized in that: Anti-collision edges (3) are provided at the left and right corners of the bottom of the storage box (1) on the side away from the fixing frame (2), and the anti-collision edges (3) wrap the left and right corners of the bottom of the storage box (1) on the side away from the fixing frame (2) inside; Preferably, the anti-collision edge (3) is a metal anti-collision edge.

7. The RFID tag fixing device according to claim 1, characterized in that: The storage box (1) is detachably connected to the fixing frame (2).

8. The RFID tag fixing device according to claim 1, characterized in that: The storage box (1) is a transparent acrylic storage box.

9. A method for determining RFID tag circulation position parameters, applied to a rail vehicle assembly line, characterized in that: The steps include: S1. Establish the coordinate system of the general assembly production line; S2, define the coordinates of the station positions of the general assembly production line; S3, set the recognition distance of the reader; S4. Design the vehicle circulation form, and use the RFID tag fixing device described in any one of claims 1 to 8 to install the RFID on the trolley column; S5, obtaining the attitude angle of the reader and the antenna transmission power; S6. Calculate the tag position, reader attitude angle, and reader transmission frequency of all stations on the production line.

10. The method for determining the flow position parameters of an RFID tag according to claim 9, characterized in that: In S5, the step of obtaining the attitude angle of the reader and the antenna transmission power includes the following steps: S5.1 Establish a half-car model of RFID tags and readers; S5.2 solves the RFID tag position coordinates according to the reader center point position coordinates and the vehicle center point position coordinates; S5.3 calculates the attitude angle of the reader and the antenna transmission power according to the coordinates of the center point of the reader and the position coordinates of the RFID tag.

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