Electronic lead seal capable of preventing electromagnetic interference

Abstract

The utility model provides an electronic lead seal with anti-electromagnetic interference, which belongs to the technical field of oiling machine lead seal, and comprises a box body and a box cover of an electronic lead seal box, a U-shaped seal line is arranged in the middle of the box body in a penetrating manner, positioning components are symmetrically arranged in the box body and positioned at the lower part of the U-shaped seal line, and a support plate is fixedly arranged at the bottom of each positioning component; a U-shaped sealing line is arranged in the box body, a positioning bolt is symmetrically arranged on the upper portion of the U-shaped sealing line in the box body, a plurality of threading columns are arranged at the bottom of the box body, and a pair of insertion holes are formed in the middles of the threading columns in a penetrating mode. The top of the lead seal is shielded through the shielding plate, so that external electromagnetic interference on the whole electronic elements in the electronic lead seal box is reduced, redundant sealing lines at the tail portion are wound on the threading column in a reciprocating mode through the inserting hole, the length of the sealing lines at the tail portion is gradually shortened, the probability that the sealing lines bind personnel is reduced, and the electronic lead seal box is more attractive.

Description

Technical Field

[0001] This utility model relates to the field of fuel dispenser lead seal technology, specifically to an electronic lead seal with anti-electromagnetic interference. Background Technology

[0002] A lead seal is a locking device applied to specific equipment by specific personnel. Once properly locked, a lead seal cannot be opened unless forcibly broken. Lead seals can be classified as customs seals, commodity inspection seals, and commercial seals depending on the person applying them. Each lead seal has a unique identification number. As long as the equipment is intact, the equipment door is properly closed, and the lead seal is properly locked, it can be proven that the equipment has not been illegally opened without authorization.

[0003] In related technologies, to prevent fuel theft and tax evasion during the use of fuel dispensers, lead seals are used on key components involving metering and tax control to prevent tampering or damage. Traditional physical lead seals consist of a sealing head and a sealing wire made of metal or other materials. The two ends of the sealing wire are inserted into the hole of the sealing head and the head is clamped with lead lock pliers to complete the seal. However, traditional lead seals cannot be monitored in real time, and it is difficult to quickly detect when they are physically broken. As a result, electronic lead seals have been introduced to the market. By installing a chip inside the lead seal, it is possible to remotely observe whether the electronic lead seal is damaged.

[0004] However, there are many motors, oil pumps, frequency converters, wireless communication devices, and other equipment around the fuel dispenser. These devices generate strong electromagnetic radiation during operation, which can easily cause electromagnetic interference to the circuitry inside the electronic seal, reducing the lifespan of its internal electronic components. Currently, most electronic seals have weak anti-electromagnetic interference capabilities and are vulnerable to remote attacks by criminals. Furthermore, the sealing line on the seal is too long after it is fixed, making it inconvenient to retract and unsightly. The sharp end of the line can also scratch operators. To solve these problems, an electronic seal with anti-electromagnetic interference technology is proposed. Utility Model Content

[0005] In view of this, the present invention provides an electronic lead seal with anti-electromagnetic interference. The present invention reduces the diffusion range of NFC signals through a shielding shell, thereby preventing remote attacks by man-in-the-middle attacks. The shielding layer further shields the electronic components inside the box, and the shielding plate shields the top of the lead seal, thereby reducing the impact of external electromagnetic interference on the overall electronic components inside the electronic lead seal box. When the lead seal is closed, the excess sealing wire at the tail is repeatedly wound through the insertion hole at the thread post, thereby gradually shortening the length of the tail sealing wire, thus storing the tail end of the sealing wire at the bottom of the box, thereby reducing the probability of the sealing wire pricking people, and also making it more aesthetically pleasing.

[0006] To solve the above-mentioned technical problems, this utility model provides an electronic seal with electromagnetic interference protection, including a box body and a box cover, a PCB board at the bottom of the box body, an NFC chip in the middle of the PCB board, a U-shaped sealing line running through the middle of the box body, a positioning component symmetrically arranged at the lower part of the U-shaped sealing line inside the box body, a support plate fixedly arranged at the bottom of each positioning component, a positioning bolt symmetrically arranged at the upper part of the U-shaped sealing line inside the box body, the positioning bolts corresponding to the positioning components, the positioning bolts all passing through the box cover, and multiple wire-passing posts at the bottom of the box body, each wire-passing post having a through-hole for the U-shaped sealing line to pass through.

[0007] The NFC chip has a shielding shell on its surface to reduce the spread of the NFC signal and prevent remote attacks by a man-in-the-middle. Each of the four sides of the box has a shielding layer to further shield the electronic components inside, reducing the impact of external electromagnetic interference on the internal components. The box body and lid are connected by a plug-in seal, and a shielding plate is located at the bottom of the lid to reinforce and shield the opening at the top of the box body.

[0008] The top of the box body is provided with a sealing groove, which is used to receive the sealing strip, thereby reinforcing and sealing the connection between the box body and the top of the lid. The outer surface of the shielding plate is provided with a sealing strip to fit the sealing groove. The sealing strip is used to fill the sealing groove, thereby connecting the box body and the lid as one unit to form a complete electronic lead-sealed box. The sealing strip is square-shaped and connected to the lid.

[0009] Each positioning component includes a positioning block for mounting a pressure sensor and a pressing groove. The positioning block has a hollow design, and a limiting groove adapted to the U-shaped sealing line is provided on the top of the positioning block to prevent the U-shaped sealing line from shaking. A pressing groove is located in the center of the limiting groove to receive the positioning bolt. A detection plate is provided on the top of the pressing groove to connect the contact of the pressure sensor to the pressing groove. A pressure sensor is provided at the bottom of the detection plate to monitor the pressure transmitted on the detection plate.

[0010] The top of the box cover has a symmetrical threaded hole for fitting the positioning bolt. The threaded hole is used to install the positioning bolt and prevent it from shaking. The threaded hole allows the positioning bolt to be threaded into the pressing groove. The threaded hole corresponds to the positioning bolt and passes through the shielding plate. The positioning bolt and the pressing groove correspond and fit together. The positioning bolt presses the U-shaped sealing line into the pressing groove through the threaded hole. Then, the pressure value during positioning is measured by the detection plate and pressure sensor. When the measured pressure value exceeds the allowable pressure deviation, the lead seal is judged to be aging and a remote alarm is triggered.

[0011] A barcode is provided on the upper part of the lid surface. The barcode is read by a dedicated decoder during re-inspection or replacement. A note is provided on the lower part of the lid surface. The note allows for manual recording of the main information of the seal, which can be easily compared with the electronic information, thereby further improving the security inspection of the seal.

[0012] One side of the NFC chip has a filter to suppress common-mode noise between the internal and external ground wires of the fuel dispenser. Adjacent to the filter is an optocoupler isolator to enhance the tamper resistance of the electronic seal. By adding an optocoupler to the power input of the electronic seal box, if unauthorized disassembly damages the optocoupler, the electronic seal will immediately cut off the sensor signal transmission and trigger an alarm. The other side of the NFC chip has an encryptor to verify and encrypt the identities of both communicating parties, preventing man-in-the-middle attacks. This prevents attackers from easily inserting malicious commands or tampering with data during communication, ensuring the security and reliability of the communication.

[0013] In summary, compared with the prior art, this application includes at least one of the following beneficial technical effects:

[0014] 1. By using a shielding shell to reduce the spread range of NFC signals, the remote attack of a man-in-the-middle is prevented. The shielding layer further shields the electronic components inside the box, and the shielding plate shields the top of the lead seal, thereby reducing the impact of external electromagnetic interference on the electronic components inside the electronic lead seal box. After the lead seal is closed, the excess sealing wire at the tail is repeatedly wound through the insertion hole and the wire thread post, thereby gradually shortening the length of the tail sealing wire and storing the tail end of the sealing wire at the bottom of the box, thus reducing the probability of the sealing wire pricking people and making it more aesthetically pleasing.

[0015] 2. The threaded hole is used to install the positioning bolt to prevent the positioning bolt from shaking. The positioning bolt presses the U-shaped sealing line into the pressing groove through the threaded hole. Then, the pressure value during positioning is measured by the detection plate and pressure sensor. When the measured pressure value exceeds the allowable pressure deviation, the lead seal is judged to be aging and a remote alarm is triggered.

[0016] 3. The sealing groove is used to receive the sealing strip, thereby reinforcing and sealing the connection between the box body and the top of the box cover. The sealing strip is used to fill the sealing groove, so that the box body and the box cover are integrated into one piece to form a complete electronic lead-sealed box. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the assembly structure of this utility model;

[0019] Figure 3 This is a front sectional view of the present invention;

[0020] Figure 4 This is a side sectional view of the present invention;

[0021] Figure 5 This is a top sectional view of the present invention.

[0022] Explanation of reference numerals in the attached diagram: 100, Electronic lead-sealed box; 101, Box body; 102, Box lid; 103, PCB board; 104, NFC chip; 105, U-shaped sealing line; 200, Positioning component; 201, Support plate; 202, Positioning block; 203, Limiting groove; 204, Pressing groove; 205, Detection plate; 206, Pressure sensor; 300, Positioning bolt; 301, Wire thread post; 302, Insertion hole; 303, Threaded hole; 400, Sealing groove; 401, Sealing strip; 402, Code bar; 403, Sticky note; 500, Shielding shell; 501, Shielding layer; 502, Shielding plate; 503, Filter; 504, Optical coupler isolator; 505, Encryptor. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the appendices of the embodiments of this utility model. Figure 1-5 The technical solutions of the embodiments of this utility model are clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0024] like Figure 1-5As shown: This embodiment provides an electronic seal with electromagnetic interference protection, including a box body 101 and a lid 102 of an electronic seal box 100. Both the box body 101 and the lid 102 are made of stainless steel. A PCB board 103 is set at the bottom of the box body 101. The PCB board 103 includes components such as a power module, a main control unit, a communication module, and a storage unit. An NFC chip 104 is set in the upper center of the PCB board 103. The NFC chip 104 is used to read NFC tags with unique IDs to verify the legality of the seal, and is also used to transmit the metering data of the fuel dispenser via NFC. The interface sends data to regulatory equipment, such as a handheld terminal of the market supervision bureau. A U-shaped sealing line 105 is installed through the middle of the box body 101. The U-shaped sealing line 105 is used to fix the interface between the meter and the main board on the fuel dispenser to prevent cheaters from tampering with the data. A positioning component 200 is symmetrically arranged below the U-shaped sealing line 105 inside the box body 101. The positioning component 200 is used to support the U-shaped sealing line 105. A support plate 201 is fixedly installed at the bottom of each positioning component 200. The support plate 201 is used to fix the positioning component 200, thereby connecting and fixing the positioning component 200 to the box wall inside the box body 101. A U-shaped sealing line 105 is symmetrically arranged above the U-shaped sealing line 105 inside the box body 101. There is a positioning bolt 300, which presses the U-shaped sealing wire 105 into the positioning component 200, thereby achieving the anti-tampering function of the U-shaped sealing wire 105. The positioning bolt 300 corresponds to the positioning component 200 and passes through the cover 102. The bottom of the box body 101 is provided with multiple wire-passing posts 301. The wire-passing posts 301 can be made of stainless steel and are welded to the box body 101. Each wire-passing post 301 has a through-hole 302 in the middle. The through-hole 302 is circular and has a gap between it. The through-hole 302 is used for the U-shaped sealing wire 105 to pass through. The seal on the U-shaped sealing wire 105 is adapted to the through-hole 302.

[0025] During use, the shielding shell 500 reduces the spread range of the NFC signal, thereby preventing remote attacks by man-in-the-middle attacks. The shielding layer 501 further shields the electronic components inside the box 101, and the shielding plate 502 shields the top of the lead seal, thereby reducing the impact of external electromagnetic interference on the overall electronic components inside the electronic lead seal box 100. After the lead seal is closed, the excess sealing wire at the tail is repeatedly wound through the insertion hole 302 and the wire thread 301. After repeated winding, it can be twisted crosswise, thereby gradually shortening the length of the tail sealing wire, so that the tail end of the sealing wire is stored at the bottom of the box 101, thereby reducing the probability of the sealing wire pricking people and making it more aesthetically pleasing.

[0026] This embodiment provides an electronic lead seal with electromagnetic interference protection.

[0027] like Figure 2 , 3As shown in Figures 4 and 5: A shielding shell 500 is provided on the surface of the NFC chip 104, covering the top of the NFC chip 104. The shielding shell 500 is welded to the PCB board 103. The shielding shell 500 is used to reduce the diffusion range of the NFC signal, thereby preventing remote attacks by man-in-the-middle attacks. A shielding layer 501 is provided on all four sides of the box body 101. The shielding layer 501 is welded to the inner wall of the box body 101 or connected by glue. The shielding layer 501 is used to further shield the electronic components inside the box body 101, thereby reducing the impact of external electromagnetic interference on the overall electronic components inside the electronic lead-sealed box 100. The box body 101 is connected to the box cover 102 by a socket-type sealing connection. A shielding plate 502 is provided at the bottom of the box cover 102. The shielding plate 502 can be welded to the bottom of the box cover 102 or fixed by bolts. The shielding plate 502 is used to fix and reinforce the shielding of the top opening of the box body 101.

[0028] Its effects are as follows: the shielding shell 500 is used to reduce the spread range of NFC signals, thereby preventing remote attacks by man-in-the-middle; the shielding layer 501 is used to further shield the electronic components inside the box body 101, thereby reducing the impact of external electromagnetic interference on the overall electronic components inside the electronic lead-sealed box 100; and the shielding plate 502 is used to fix and reinforce the shielding of the top opening of the box body 101.

[0029] like Figure 1 , 2 As shown in Figures 3 and 4: A sealing groove 400 is provided on the top of the box body 101. The sealing groove 400 is embedded in the box wall at the top of the box body 101. The sealing groove 400 is used to receive the sealing strip 401, thereby reinforcing and sealing the connection between the box body 101 and the top of the box cover 102. The outer surface of the shielding plate 502 is provided with a sealing strip 401 for fitting the sealing groove 400. The sealing strip 401 and the box cover 102 can be bonded together. The sealing strip 401 is used to fill the sealing groove 400, thereby connecting the box body 101 and the box cover 102 into one piece. After connection, the outer surface can be reinforced and sealed with epoxy resin to form a complete electronic lead-sealed box 100. The sealing strip 401 is square-shaped and connected to the box cover 102.

[0030] Its effect is as follows: the sealing groove 400 is used to receive the sealing strip 401, thereby reinforcing and sealing the connection between the box body 101 and the top of the box cover 102. The sealing strip 401 is used to fill the sealing groove 400, thereby connecting the box body 101 and the box cover 102 into one, forming a complete electronic lead-sealed box 100.

[0031] like Figure 2 , 3As shown in Figure 4: Each positioning component 200 includes a positioning block 202, which is fixed to the support plate 201 by bolts. The positioning block 202 is used to install the pressure sensor 206 and the pressing groove 204. The positioning block 202 has a hollow design, and a detachable base plate is provided at the bottom of the positioning block 202. The top of the positioning block 202 is provided with a limiting groove 203 adapted to the U-shaped sealing line 105. The limiting groove 203 is rectangular with a circular center, and the circle is wrapped inside the rectangle. The limiting groove 203 is used to prevent the U-shaped sealing line 105 from shaking. The pressing groove 204 is centrally located in the limiting groove 203. The pressing groove 204 is circular. 204 is embedded in the middle of the limiting groove 203. The pressing groove 204 is used to receive the positioning bolt 300. A detection plate 205 is provided on the top of the pressing groove 204. The top of the detection plate 205 can be glued to the bottom of the limiting groove 203 or fixed by bolts. The detection plate 205 is used to connect the contact of the pressure sensor 206 to the pressing groove 204. A pressure sensor 206 is provided at the bottom of the detection plate 205. The contact of the pressure sensor 206 is in contact with the detection plate 205. The pressure sensor 206 is used to monitor the pressure transmitted on the detection plate 205. The pressure sensor 206 is connected and fixed to the hollow inner wall of the positioning block 202.

[0032] Its functions are as follows: the positioning block 202 is used to install the pressure sensor 206 and the pressing groove 204; the limiting groove 203 is used to prevent the U-shaped sealing line 105 from shaking; the pressing groove 204 is used to receive the positioning bolt 300; the detection plate 205 is used to connect the contact of the pressure sensor 206 with the pressing groove 204; and the pressure sensor 206 is used to detect the pressure value on the detection plate 205.

[0033] like Figure 1 , 3 As shown in Figure 4: The top of the cover 102 is symmetrically provided with a threaded hole 303 for fitting the positioning bolt 300. The threaded hole 303 is used to install the positioning bolt 300 and prevent the positioning bolt 300 from shaking. The threaded hole 303 allows the positioning bolt 300 to be threaded into the pressing groove 204. The threaded hole 303 corresponds to the positioning bolt 300 and passes through the cover 102 and the shielding plate 502. The positioning bolt 300 corresponds to and fits the pressing groove 204. Through the threaded hole 303, the positioning bolt 300 presses the U-shaped sealing line 105 into the pressing groove 204. Then, the pressure value during positioning is measured by the detection plate 205 in conjunction with the pressure sensor 206. When the measured pressure value exceeds the allowable pressure deviation, the lead seal is judged to be aging and a remote alarm is triggered.

[0034] Its effect is as follows: the threaded hole 303 is used to install the positioning bolt 300 to prevent the positioning bolt 300 from shaking. The positioning bolt 300 presses the U-shaped sealing line 105 into the pressing groove 204 through the threaded hole 303. Then, the pressure value during positioning is measured by the detection plate 205 in conjunction with the pressure sensor 206. When the measured pressure value exceeds the allowable pressure deviation, the lead seal is judged to be aging and a remote alarm is triggered.

[0035] like Figure 1 , 4 As shown in Figure 5: A barcode strip 402 is provided on the upper part of the surface of the lid 102. The barcode strip 402 is bonded to the surface of the lid 102 or embedded therein. The barcode strip 402 is used for reading the strip using a dedicated decoder during re-inspection or replacement. A sticky note strip 403 is provided on the lower part of the surface of the lid 102. The sticky note strip 403 is bonded to the surface of the lid 102 with adhesive. The sticky note strip 403 facilitates manual recording of the main information of the seal, which is convenient for comparison with electronic information, thereby further improving the security inspection of the seal. A filter 503 is provided on one side of the NFC chip 104. The filter 503 can be an LC filter 503. The filter 503 can be soldered or plugged into the PCB board 103. The filter 503 is used to suppress the flow of gas from the inside to the outside of the fuel dispenser. To mitigate common-mode noise between ground wires, an optocoupler 504 is installed on the side of filter 503. The optocoupler 504 can be plugged into PCB board 103. The optocoupler 504 enhances the tamper resistance of the electronic seal. By installing an optocoupler at the power input terminal of the electronic seal box 100, when unauthorized disassembly damages the optocoupler, the electronic seal will immediately cut off the sensor signal transmission and trigger an alarm. An encryptor 505 is installed on the other side of NFC chip 104. The encryptor 505 can be soldered to PCB board 103. The encryptor 505 is used to verify and encrypt the identities of both communicating parties, preventing man-in-the-middle attacks. It can prevent attackers from easily inserting malicious commands or tampering with data during communication, ensuring the security and reliability of communication.

[0036] Its effects are as follows: the barcode reader 402 is used to read the barcode through a dedicated decoder during re-inspection or replacement; the sticky note 403 facilitates manual recording of the main information of the lead seal, making it easy to compare with electronic information, thereby further improving the security inspection of the lead seal; the filter 503 is used to suppress common-mode noise between the internal and external ground wires of the fuel dispenser; the optocoupler isolator 504 can enhance the anti-tampering capability of the electronic lead seal. By installing an optocoupler at the power input terminal of the electronic lead seal box 100, when the optocoupler is damaged due to illegal disassembly, the electronic lead seal will immediately cut off the sensor signal transmission and trigger an alarm; the encryptor 505 is used to verify and encrypt the identities of the two communicating parties to prevent man-in-the-middle attacks. It can prevent attackers from easily inserting malicious instructions or tampering with data during communication, ensuring the security and reliability of communication.

[0037] Working principle: The shielding shell 500 reduces the spread range of NFC signals, thereby preventing remote attacks by man-in-the-middle attacks. The shielding layer 501 further shields the electronic components inside the box body 101, and the shielding plate 502 shields the top of the lead seal, thereby reducing the impact of external electromagnetic interference on the overall electronic components inside the electronic lead seal box 100. After the lead seal is closed, the excess sealing wire at the tail is repeatedly wound around the wire thread post 301 through the insertion hole 302, thereby gradually shortening the length of the tail sealing wire and storing the tail end of the sealing wire at the bottom of the box body 101, thereby reducing the probability of the sealing wire pricking people and making it more aesthetically pleasing.

[0038] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. An electronic lead seal with anti-electromagnetic interference, comprising a box body (101) and a box cover (102) of an electronic lead seal box (100), a PCB board (103) arranged at the bottom of the box body (101), an NFC chip (104) arranged at the middle of the PCB board (103), and a U-shaped sealing line (105) arranged through the middle of the box body (101), characterized in that: The box body (101) is provided with a positioning assembly (200) at the lower part of the U-shaped sealing line (105) symmetrically, each of the positioning assembly (200) is fixedly provided with a support plate (201) at the bottom, the box body (101) is provided with a positioning bolt (300) at the upper part of the U-shaped sealing line (105) symmetrically, the positioning bolt (300) corresponds to the positioning assembly (200), the positioning bolt (300) penetrates the box cover (102), the box body (101) is provided with a plurality of threading columns (301) at the bottom, the middle part of each of the threading columns (301) is provided with a plug hole (302), and the plug hole (302) is used for threading the U-shaped sealing line (105). ​ 2. An electronic lead seal with electromagnetic interference protection as defined in claim 1, wherein: The surface of the NFC chip (104) is provided with a shielding shell (500), the periphery of the box body (101) is provided with a shielding layer (501), the box body (101) and the box cover (102) are connected in a socket type sealing connection, and the bottom of the box cover (102) is provided with a shielding plate (502).

3. An electronic lead seal with electromagnetic interference protection as defined in claim 2, wherein: The box body (101) is provided with a sealing groove (400) at the top, the outer surface of the shielding plate (502) is provided with a sealing strip (401) used for adapting the sealing groove (400), the sealing strip (401) is in a square box shape, and the sealing strip (401) is connected with the box cover (102).

4. An electronic lead seal with electromagnetic interference protection as defined in claim 3, wherein: The positioning assembly (200) comprises a positioning block (202), the positioning block (202) is hollow, the top of the positioning block (202) is provided with a limiting groove (203) matched with the U-shaped sealing line (105), the limiting groove (203) is provided with a pressing groove (204) in the middle, the top of the pressing groove (204) is provided with a detection plate (205), and the bottom of the detection plate (205) is provided with a pressure sensor (206).

5. An electronic lead seal with electromagnetic interference protection as described in claim 4, characterized in that: The box cover (102) is provided with a threaded hole (303) matched with the positioning bolt (300) symmetrically at the top, the threaded hole (303) corresponds to the positioning bolt (300), the threaded hole (303) penetrates the shielding plate (502), and the positioning bolt (300) corresponds to and matches the pressing groove (204).

6. An electronic lead seal with electromagnetic interference protection as defined in claim 5, wherein: The surface of the box cover (102) is provided with a code reading strip (402) at the upper part, and is provided with a note strip (403) at the lower part.

7. An electronic lead seal with electromagnetic interference protection as defined in claim 6, wherein: One side of the NFC chip (104) is provided with a filter (503), the filter (503) is provided with an optocoupler isolator (504) at the side, and the other side of the NFC chip (104) is provided with an encryptor (505).

Images