Electronic scale and tamper-proof weighing system thereof

Abstract

The utility model relates to the field of electronic scales, in particular to an electronic scale and a tamper-proof weighing system thereof, which comprise a weighing sensor, a weighing module mainboard, a microprocessor, a display module and a keyboard group. The weighing module mainboard is connected with the weighing sensor and the microprocessor, and the microprocessor is connected with the display module and the keyboard group. The weighing sensor comprises a shell and a strain gauge arranged in the shell, and the weighing module mainboard is packaged in the shell of the weighing sensor; the weighing system further comprises an anti-cheating module, the anti-cheating module is embedded in the shell of the weighing sensor, the inner end of the anti-cheating module is connected with the main board of the weighing module, and the trigger end of the anti-cheating module is exposed out of the upper end of the shell of the weighing sensor. The weighing system of the electronic scale can prevent the analog signal and the monitoring circuit from being tampered, and the safety is high.

Description

Technical Field

[0001] The utility model relates to the field of electronic scales, in particular to an electronic scale and an anti-tampering weighing system thereof. Background Art

[0002] Electronic price-calculating scales are electronic weighing instruments with a pricing function, and are widely used as important livelihood measuring instruments in market transactions of fruits, vegetables, meat, poultry, eggs, aquatic products, and seafood. In the period of rapid social and economic development, the problem of electronic scale cheating needs to be solved urgently in the process of continuous improvement of the social credit system. The majority of measurement personnel have also conducted extensive research on anti-cheating technologies, and the relevant technical specifications also have clear clauses and requirements. However, due to the great difficulty of supervision, cheating still continues despite repeated bans.

[0003] In the past, cheating methods were relatively low-level, such as deliberately designing electronic scales to be uneven and attaching imperceptible items to the scale pan to achieve the effect of short-weighting. These types of cheating methods were relatively easy to detect. Today, cheating methods have been upgraded. Converters are added to the weighing system inside the electronic scale, or the normal program in the electronic scale chip is tampered with, and cheating programs are entered to increase the weight of the items. The tampered program is generally turned on and off by buttons on the electronic scale, and it is difficult to detect even if the electronic scale is carefully inspected. This type of behavior not only makes huge profits, but also pollutes the clean market environment, but also destroys the normal market order, making it difficult for the trading market to remain fair and just. Summary of the invention

[0004] In order to solve the above problems, the first purpose of the utility model is to provide an anti-tampering weighing system for an electronic scale, which can prevent analog signals and monitoring circuits from being tampered with and has high security.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0006] The tamper-proof weighing system of the electronic scale comprises a weighing sensor, a weighing module mainboard, a microprocessor, a display module and a keyboard group; the weighing module mainboard is respectively connected to the weighing sensor and the microprocessor, and the microprocessor is respectively connected to the display module and the keyboard group; the weighing sensor comprises a shell, and a strain gauge arranged inside the shell, and the weighing module mainboard is encapsulated inside the shell of the weighing sensor; the weighing system also comprises an anti-cheating module, the anti-cheating module is embedded in the shell of the weighing sensor, the inner end of the anti-cheating module is connected to the weighing module mainboard, and the trigger end of the anti-cheating module is exposed at the upper end of the shell of the weighing sensor.

[0007] The utility model adopts the above-mentioned technical scheme, which relates to an anti-tampering weighing system for an electronic scale. The weighing sensor in the anti-tampering weighing system is used to convert the weighing weight on the scale pan into an electronic signal, and converts it into a digital signal through a weighing module mainboard and transmits it to a microprocessor. The microprocessor communicates with a display module to control the display content and is connected to a keypad to scan keys.

[0008] On this basis, on the one hand, this solution embeds the weighing module mainboard into the shell of the weighing sensor and then packages it, so that it is impossible to install a conversion module between the strain gauge and the weighing module mainboard, so that the signal quantity will not be tampered with, and the path for the analog signal to be tampered with is blocked; on the other hand, the anti-cheating module is embedded in the shell of the weighing sensor, and the inner end is connected to the weighing module mainboard, so that it can be electrically connected to the weighing module mainboard encapsulated inside the shell, and the disassembly and assembly status of the electronic scale can be monitored through the anti-cheating module; in this solution, the anti-cheating module is integrated with the weighing sensor, and the difficulty of tampering with the monitoring circuit is increased.

[0009] Based on the above scheme, the weighing system of the electronic scale can prevent analog signals and monitoring circuits from being tampered with, and has high security.

[0010] In a specific implementation scheme, a first through hole is provided on the housing of the weighing sensor, and the weighing module mainboard is provided inside the housing through the first through hole, and the first through hole is sealed with glue. In this scheme, the weighing module mainboard is sealed with glue after being installed into the housing through the first through hole, so that the seal needs to be broken in case of tampering or cheating, and subsequent inspection can easily find out whether tampering has been performed.

[0011] Preferably, a second through hole is provided on the upper end surface of the housing of the weighing sensor, and the anti-cheating module is embedded in and closes the second through hole. After being embedded in the second through hole, the anti-cheating module is integrated with the weighing sensor, and can also be connected to the weighing module mainboard.

[0012] In a further solution, the anti-cheating module is constructed as a mechanical button, and the key of the mechanical button is exposed through the second through hole at the upper end of the shell. The anti-cheating module adopts a mechanical button, and the key of the mechanical button is supported on the upper shell or the lower shell. When the upper shell and the lower shell are separated, the key of the mechanical button pops up and is in an activated state. The anti-cheating module inputs a signal to the weighing module mainboard, so that the weighing module mainboard interrupts the transmission of weighing information. By adopting a mechanical button, the anti-cheating module has strong anti-interference ability, reduces the possibility of being tampered with, and prevents the situation where it is mistaken for tampering with the electronic scale and being locked.

[0013] Preferably, the weighing module mainboard is also connected to a backup battery. The backup battery can prevent unscrupulous merchants from cutting off the power supply of the electronic pricing scale to render the anti-cheating module's monitoring of the electronic scale ineffective, thereby illegally disassembling and modifying the electronic scale.

[0014] In a further solution, the microprocessor and the display module are arranged on the same PCB board, and a key interface is arranged on the PCB board for connecting a keyboard group. In the solution here, the microprocessor and the display module are arranged on the same PCB board, and are not connected through a pin interface, so that a conversion module is not added between the microprocessor and the display module, and the cheating path of adding a conversion module to the display interface to change the display content is blocked.

[0015] In a specific solution, the display module includes a display driver provided on a PCB board, and a plurality of groups of display units connected to the display driver.

[0016] Preferably, the weighing module mainboard and the microprocessor are transmitted via encrypted digital signals. In this solution, the signal output by the digital sensor is encrypted, and other mainboards cannot obtain the content of the digital sensor. Unless the digital sensor and the display panel are completely replaced, the electronic scale cannot be successfully modified, which increases the difficulty and cost of modification.

[0017] Preferably, a time module is embedded in the weighing module mainboard; when the anti-cheating module is triggered, the weighing module mainboard can record the triggering time. In this solution, a time module is embedded in the weighing module mainboard, and the weighing module mainboard can record the time and number of times the electronic scale is removed as traceability information.

[0018] The second object of the utility model is to provide an electronic scale, characterized in that it includes the tamper-proof weighing system of the electronic scale described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the tamper-proof weighing system described in Example 1.

[0020] Figure 2 This is a structural diagram of a digital sensor.

[0021] Figure 3 This is a schematic diagram of the structure of the electronic scale described in Example 2. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 understood as a limitation on the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more, unless otherwise clearly defined.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. Example 1

[0027] like Figure 1 and 2 As shown, this embodiment relates to an anti-tampering weighing system for an electronic scale, including a weighing sensor 1, a weighing module mainboard 2, a microprocessor 3, a display module and a keyboard group 5; the weighing module mainboard 2 is respectively connected to the weighing sensor 1 and the microprocessor 3, and the microprocessor 3 is respectively connected to the display module and the keyboard group 5; the technical scheme relates to an anti-tampering weighing system for an electronic scale, the weighing sensor 1 in the anti-tampering weighing system is used to convert the weighing weight on the scale pan into an electronic signal, and convert it into a digital signal through the weighing module mainboard 2 and transmit it to the microprocessor 3, the microprocessor 3 communicates with the display module to control the display content, and is connected to the keypad to scan the keys.

[0028] like Figure 1 As shown, the weighing sensor 1 includes a shell 11 and a strain gauge 12 arranged inside the shell 11, and the weighing module mainboard 2 is encapsulated inside the shell 11 of the weighing sensor 1; the weighing system also includes an anti-cheating module 6, the anti-cheating module 6 is embedded in the shell 11 of the weighing sensor 1, the inner end is connected to the weighing module mainboard 2, and the trigger end of the anti-cheating module 6 is exposed at the upper end of the shell 11 of the weighing sensor 1. On the one hand, this solution embeds the weighing module mainboard 2 into the shell 11 of the weighing sensor 1 and then packages it, so that it is impossible to install a conversion module between the strain gauge 12 and the weighing module mainboard 2, so that the signal quantity will not be tampered with, and the path of the analog signal being tampered with is blocked; on the other hand, the anti-cheating module 6 is embedded in the shell 11 of the weighing sensor 1, and the inner end is connected to the weighing module mainboard 2, so that it can be electrically connected to the weighing module mainboard 2 packaged inside the shell 11, and the disassembly and assembly status of the electronic scale can be monitored through the anti-cheating module 6; in this solution, the anti-cheating module 6 is integrated with the weighing sensor 1, and the difficulty of tampering with the monitoring circuit is increased.

[0029] Based on the above scheme, the weighing system of the electronic scale can prevent analog signals and monitoring circuits from being tampered with, and has high security.

[0030] exist Figure 2 In the specific implementation scheme shown, a first through hole 111 is provided on the housing 11 of the weighing sensor 1, and the weighing module mainboard 2 is provided inside the housing 11 through the first through hole 111, and the first through hole 111 is sealed with glue. In this scheme, the weighing module mainboard 2 is sealed with glue after being loaded into the housing 11 from the first through hole 111, so that the seal needs to be broken in case of tampering or cheating, and it can be easily found whether tampering has been performed during subsequent inspection. A second through hole 112 is provided on the upper end surface of the housing 11 of the weighing sensor 1, and the anti-cheating module 6 is embedded and closes the second through hole 112. After the anti-cheating module 6 is embedded in the second through hole 112, it is integrated with the weighing sensor 1, and the inside can also be connected to the weighing module mainboard 2.

[0031] In a further solution, the anti-cheating module 6 is constructed as a mechanical button, and the key 61 of the mechanical button exposes the second through hole 112 and is located at the upper end of the housing 11. The anti-cheating module 6 adopts a mechanical button, and the key 61 of the mechanical button is supported on the upper housing or the lower housing of the electronic scale body. When the upper housing and the lower housing are separated, the key 61 of the mechanical button pops up and is in an activated state, and the anti-cheating module 6 inputs a signal to the weighing module mainboard 2, so that the weighing module mainboard 2 interrupts the transmission of weighing information. By adopting a mechanical button, the anti-cheating module 6 has strong anti-interference performance, reduces the possibility of being tampered with, and prevents the situation where it is mistakenly believed that the electronic scale has been tampered with and locked.

[0032] Figure 1 In the embodiment, the weighing module mainboard 2 is also connected to a backup battery 7. The backup battery 7 can prevent unscrupulous merchants from cutting off the power supply of the electronic price computing scale to disable the monitoring of the electronic scale by the anti-cheating module 6, thereby illegally disassembling and modifying the electronic scale.

[0033] In a further solution, the microprocessor 3 and the display module are arranged on the same PCB board, and a key interface 31 is arranged on the PCB board for connecting the keyboard group 5. In the solution here, the microprocessor 3 and the display module are arranged on the same PCB board, but not docked through a pin interface, which can prevent the addition of a conversion module between the microprocessor 3 and the display module, and block the cheating path of adding a conversion module to the display interface to change the display content. In a specific solution, the display module includes a display driver 41 arranged on the PCB board, and a plurality of groups of display units 42 connected to the display driver 41.

[0034] In addition, the weighing module mainboard 2 and the microprocessor 3 are transmitted via encrypted digital signals. In this scheme, the signal output by the digital sensor is encrypted, and other mainboards cannot obtain the content of the digital sensor. Unless the digital sensor and the display board are completely replaced, the electronic scale cannot be successfully modified, which increases the difficulty and cost of modification.

[0035] In a more preferred solution, a time module is also embedded in the weighing module mainboard 2; when the anti-cheating module 6 is triggered, the weighing module mainboard 2 can record the triggering time. In this solution, a time module is also embedded in the weighing module mainboard 2, and the weighing module mainboard 2 can record the time and number of times the electronic scale is removed as traceability information.

[0036] In summary, the advantages of the tamper-proof weighing system of this electronic scale are:

[0037] The weighing module mainboard 2 is embedded in the weighing sensor 1 and sealed with glue, and cannot be changed or replaced;

[0038] The analog signal line of the weighing sensor 1 is connected to the weighing module to form a digital sensor, which is not exposed, and the signal quantity will not be changed, blocking the path for the analog signal to be changed;

[0039] The digital sensor reserves an interface for monitoring the switch of removing the cover. After the mechanical switch is connected, it is integrated with the sensor, making it more difficult to modify the monitoring circuit;

[0040] The microcontroller and the display driver 41 are on the same PCB board, and the two are not connected through a pin interface, which blocks the cheating path of adding a conversion module to the display interface to change the display content;

[0041] The signal output by the digital sensor is encrypted, and other mainboards cannot obtain the content of the digital sensor. Unless the digital sensor and display board are completely replaced, the electronic scale cannot be successfully modified, which increases the difficulty and cost of modification. Example 2

[0042] like Figure 3 As shown, this embodiment provides an electronic scale, including the tamper-proof weighing system of the electronic scale described in Example 1.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0044] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. An anti-tampering weighing system for an electronic scale, comprising a weighing sensor (1), a weighing module mainboard (2), a microprocessor (3), a display module and a keyboard group (5); the weighing module mainboard (2) is respectively connected to the weighing sensor (1) and the microprocessor (3), and the microprocessor (3) is respectively connected to the display module and the keyboard group (5); the characteristics are: The weighing sensor (1) comprises a housing (11) and a strain gauge (12) arranged inside the housing (11); the weighing module mainboard (2) is encapsulated inside the housing (11) of the weighing sensor (1); the weighing system further comprises an anti-cheating module (6); the anti-cheating module (6) is embedded in the housing (11) of the weighing sensor (1), the inner end of the anti-cheating module (6) is connected to the weighing module mainboard (2), and the trigger end of the anti-cheating module (6) is exposed at the upper end of the housing (11) of the weighing sensor (1).

2. The tamper-proof weighing system for an electronic scale according to claim 1, characterized in that: A first through hole (111) is provided on the housing (11) of the weighing sensor (1); the weighing module mainboard (2) is arranged inside the housing (11) through the first through hole (111), and the first through hole (111) is sealed with glue.

3. The tamper-proof weighing system for an electronic scale according to claim 1, characterized in that: A second through hole (112) is provided on the upper end surface of the housing (11) of the weighing sensor (1), and the anti-cheating module (6) is embedded in and closes the second through hole (112).

4. The tamper-proof weighing system for an electronic scale according to claim 3, characterized in that: The anti-cheating module (6) is constructed as a mechanical button, and the key (61) of the mechanical button is exposed from the second through hole (112) and is located at the upper end of the housing (11); the key (61) of the mechanical button is supported on the upper housing or the lower housing, and when the upper housing and the lower housing are separated, the key (61) of the mechanical button pops up and is in an activated state, and the anti-cheating module (6) inputs a signal to the weighing module mainboard (2), so that the weighing module mainboard (2) interrupts the transmission of weighing information.

5. The tamper-proof weighing system for an electronic scale according to claim 1, characterized in that: The weighing module mainboard (2) is also connected to a backup battery (7).

6. The tamper-proof weighing system for an electronic scale according to any one of claims 1 to 4, characterized in that: The microprocessor (3) and the display module are arranged together on the same PCB board, and the PCB board is provided with a key interface (31) for connecting to a keyboard group (5).

7. The tamper-proof weighing system for an electronic scale according to claim 6, characterized in that: The display module comprises a display driver (41) provided on a PCB board, and a plurality of groups of display units (42) connected to the display driver (41).

8. The tamper-proof weighing system for an electronic scale according to claim 6, characterized in that: The weighing module mainboard (2) and the microprocessor (3) are transmitted via encrypted digital signals.

9. The tamper-proof weighing system for an electronic scale according to claim 1, characterized in that: A time module is also embedded in the weighing module mainboard (2); when the anti-cheating module (6) is triggered, the weighing module mainboard (2) can record the triggering time.

10. Electronic scale, characterized in that: A tamper-proof weighing system comprising the electronic scale according to any one of claims 1 to 9.

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