Electronic belt scale based on pressure sensor with automatic switching of scale platform failure

Abstract

The scale table fault automatic switching method of the pressure sensor-based electronic belt scale of the application comprises: calculating the difference between the first pressure sensor, the second pressure sensor, the third pressure sensor and the fourth pressure sensor respectively; when the first pressure sensor fails, the PLC line controller automatically switches the first emergency scale to the second emergency scale; when the second pressure sensor fails, the PLC line controller automatically switches the first emergency scale to the second emergency scale; when the third pressure sensor fails, the PLC line controller automatically switches the second emergency scale to the first emergency scale; when the fourth pressure sensor fails, the PLC line controller automatically switches the second emergency scale to the first emergency scale; when the first pressure sensor, the second pressure sensor, the third pressure sensor and the fourth pressure sensor do not fail, the PLC line controller automatically defaults to running the input of the scale.

Description

Technical Field

[0001] This invention relates to an automatic switching method for the weighing platform of an electronic belt scale based on a pressure sensor when a sensor in the belt scale malfunctions. Background Technology

[0002] In tobacco processing lines, numerous metering devices exist. The stability of these devices directly impacts the processing quality of tobacco leaves and shredded tobacco. Electronic belt scales, in particular, combine electronic and automation technologies to achieve continuous and dynamic metering of materials on belt conveyors. The core functions of electronic belt scales include: sensors (capable of accurately measuring the weight of materials on the belt, providing accurate data for metering), belt movement detection, and fault diagnosis and alarm functions (equipped with real-time online fault monitoring, intelligent diagnosis, and automatic alarm capabilities).

[0003] This method has the following problems:

[0004] (1) When the electronic belt scale malfunctions, the machine needs to be shut down for replacement, which leads to batch interruption;

[0005] (2) When replacing the faulty electronic belt scale sensor, the lack of automatic switching function due to the time gap during switching will lead to measurement error and make it difficult to guarantee measurement accuracy.

[0006] (3) Data synchronization and consistency are difficult to guarantee when the electronic belt scale switches sensors. Summary of the Invention

[0007] The purpose of this invention is to provide a method for automatic switching of the weighing platform in an electronic belt scale based on a pressure sensor.

[0008] The CK-type electronic belt scale includes two independent emergency weighing scales and one integrated dual emergency weighing scale. These scales incorporate pressure sensors at their core. Data acquired by these sensors and uploaded to the PLC system allows for the acquisition of real-time flow and cumulative volume. This invention, based on modular design, redundant deployment, and load balancing, constructs a fault-switching method for the electronic belt scale's pressure sensors. By combining real-time data feedback from the dual emergency scales and the integrated scale, when a sensor failure occurs during production, the system can automatically and seamlessly switch tasks to a single subsystem, thereby avoiding material interruptions and ensuring batch integrity and real-time data synchronization and consistency.

[0009] To achieve the purpose of this invention, the following technical solution is adopted:

[0010] This invention discloses an automatic switching method for a faulty electronic belt scale based on pressure sensors. The electronic belt scale platform includes: a first pressure sensor, a second pressure sensor, a third pressure sensor, a fourth pressure sensor, a first emergency scale, a second emergency scale, a first belt roller, a second belt roller, a PLC wired controller, a running scale, a platform, and a belt. The first and second belt rollers are placed parallel to each other, and the belt passes around the first and second belt rollers. The first and second pressure sensors are respectively placed on the back of the belt near the front and rear ends of the first belt roller; the third and fourth pressure sensors are respectively placed on the back of the belt near the front and rear ends of the second belt roller. The platform is placed on the first... Below the first and second belt rollers, a first emergency scale, a second emergency scale, and a running scale are placed on a platform. The outputs of the first and second pressure sensors are respectively connected to the input of the first emergency scale; the outputs of the third and fourth pressure sensors are respectively connected to the input of the second emergency scale; the outputs of the first and second emergency scales are respectively connected to the input of the running scale; and the outputs of the first, second, third, and fourth pressure sensors, the first emergency scale, the second emergency scale, and the running scale are respectively connected to the input of a PLC wired controller. The feature is that the automatic switching method for platform faults of the electronic belt scale based on pressure sensors includes:

[0011] (a) Calculate the differences between the first pressure sensor, the second pressure sensor, the third pressure sensor, and the fourth pressure sensor respectively.

[0012] IN1, IN2, IN3 and IN4 represent the weight outputs of the first pressure sensor, the second pressure sensor, the third pressure sensor and the fourth pressure sensor, respectively. IN5 and IN6 represent the horizontal alarm value and the vertical alarm value, respectively. IN5 and IN6 are fixed values.

[0013]

[0014]

[0015]

[0016]

[0017] (ii) When the first pressure sensor malfunctions, the PLC wired controller will automatically switch.

[0018] The first pressure sensor transmits its output to the PLC wired controller. When the output of the first pressure sensor is one of the following two, the PLC wired controller automatically switches the first emergency scale to the second emergency scale.

[0019] (a) When the output position PIW282 of the first pressure sensor is greater than or equal to 27648, or when the output position PIW280 of the first pressure sensor is less than or equal to 200, the output of the first pressure sensor will show a fault. At this time, the first emergency scale connected to the first pressure sensor will malfunction.

[0020] (b) When TEMP 14 ≥IN5 and TEMP 23 <IN5 and TEMP 12 If the output of the first pressure sensor is ≥IN6, then the first emergency scale connected to the first pressure sensor will malfunction.

[0021] (iii) The second pressure sensor malfunctioned.

[0022] The second pressure sensor transmits its output to the PLC wired controller. When the output of the second pressure sensor is one of the following two conditions, the PLC wired controller automatically switches the first emergency scale to the second emergency scale.

[0023] (c) When the output position PIW282 of the second pressure sensor is greater than or equal to 27648, or when the output position PIW280 of the second pressure sensor is less than or equal to 200, the output of the second pressure sensor will show a fault. At this time, the first emergency scale connected to the second pressure sensor will malfunction.

[0024] (d) When TEMP 23 ≥IN5 and TEMP 14 <IN5 and TEMP 12 If the output is ≥IN6, then the second pressure sensor is faulty. At this time, the first emergency scale connected to the second pressure sensor will malfunction.

[0025] (iv) The third pressure sensor is malfunctioning.

[0026] The third pressure sensor transmits its output to the PLC wired controller. When the output of the third pressure sensor is one of the following two, the PLC wired controller automatically switches the second emergency scale to the first emergency scale.

[0027] (e) When the output position PIW282 of the third pressure sensor is ≥27648, or when the output position PIW280 of the third pressure sensor is ≤200, the output of the third pressure sensor will show a fault. At this time, the second emergency scale connected to the third pressure sensor will malfunction.

[0028] (f) When TEMP 23 ≥IN5 and TEMP 14 <IN6 and TEMP 34If the output of the third pressure sensor is ≥IN6, then the output of the third pressure sensor is faulty. At this time, the second emergency scale connected to the third pressure sensor will malfunction.

[0029] (v) The fourth pressure sensor is malfunctioning.

[0030] The fourth pressure sensor transmits its output to the PLC wired controller. When the output of the fourth pressure sensor is one of the following two conditions, the PLC wired controller automatically switches the second emergency scale to the first emergency scale.

[0031] (g) When the output position PIW282 of the fourth pressure sensor is ≥27648, or when the output position PIW280 of the fourth pressure sensor is ≤200, the output of the fourth pressure sensor will show a fault. At this time, the second emergency scale connected to the fourth pressure sensor will malfunction.

[0032] (h) When TEMP 14 ≥IN5 and TEMP 23 <IN5 and TEMP 34 If the output of the fourth pressure sensor is ≥IN6, then the output of the fourth pressure sensor is faulty. At this time, the second emergency scale connected to the fourth pressure sensor will also malfunction.

[0033] (vi) No faults were found in the first pressure sensor, the second pressure sensor, the third pressure sensor, and the fourth pressure sensor.

[0034] When the first, second, third, and fourth pressure sensors are not faulty, the PLC wired controller will automatically default to the input of the scale.

[0035] The present invention provides an automatic switching method for a pressure sensor-based electronic belt scale platform in the following manner: when the first, second, third, and fourth pressure sensors are not faulty, the flow rate of the operating scale is (flow rate of the first emergency scale + flow rate of the second emergency scale) / 2. The flow rate values ​​of the first emergency scale, the second emergency scale, and the operating scale are stored and recorded in the database of the PLC wired controller. When the first emergency scale or the second emergency scale malfunctions and switching is required, the flow rate value of the operating scale at the previous time when no malfunction occurred is used to replace the flow rate value of the first emergency scale or the second emergency scale to be used at this time.

[0036] The present invention relates to an automatic switching method for a faulty electronic belt scale based on a pressure sensor, wherein the horizontal alarm value IN5 is the difference between two pressure sensors perpendicular to the belt running direction, and IN5 is 0.8-1.2 kg.

[0037] The present invention relates to an automatic switching method for platform failure of an electronic belt scale based on pressure sensors, wherein: the vertical alarm value IN6 is the difference between two pressure sensors parallel to the belt running direction, and IN6 is 4.8-5.2 kg.

[0038] The present invention relates to an automatic switching method for a faulty electronic belt scale based on pressure sensors, wherein the first pressure sensor, the second pressure sensor, the third pressure sensor, and the fourth pressure sensor are placed on the back of the belt in a counterclockwise direction.

[0039] The present invention provides an automatic fault switching method for electronic belt scales based on pressure sensors. Based on the concepts of modular design, redundant deployment and load balancing, the method designs a dynamic fault switching between the first emergency scale, the second emergency scale 2 and the operating scale in the electronic belt scale to ensure the integrity of the batch.

[0040] The automatic switching method for electronic belt scale platform failure based on pressure sensors of this invention offers the following advantages: It solves the problem of material interruption caused by the need for machine shutdown for replacement due to electronic belt scale failure by using a static scale-based method to ensure stable operation of the feeding (fragrant) machine; it also solves the problem of measurement errors caused by sensor replacement, making it difficult to guarantee measurement accuracy; and it also solves the problem of data synchronization and consistency during sensor switching. Furthermore, this method involves dynamic, real-time detection and automatic completion without human intervention, enhancing the robustness and reliability of the electronic belt scale system. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of an electronic belt scale using a pressure sensor employing the method of the present invention.

[0042] exist Figure 1 In the diagram, number 1 is the first pressure sensor; number 2 is the second pressure sensor; number 3 is the third pressure sensor; number 4 is the fourth pressure sensor; number 5 is the first emergency scale; number 6 is the second emergency scale; number 7 is the first belt roller; number 8 is the second belt roller; number 9 is the PLC wire controller; number 10 is the operating scale; number 11 is the platform; and number 12 is the belt. Detailed Implementation

[0043] like Figure 1As shown, the electronic belt scale of the present invention includes: a first pressure sensor 1, a second pressure sensor 2, a third pressure sensor 3, a fourth pressure sensor 4, a first emergency scale 5, a second emergency scale 6, a first belt roller 7, a second belt roller 8, a PLC wired controller 9, a running scale 10, a platform 11, and a belt 12. The first belt roller 7 and the second belt roller 8 are placed parallel to each other, and the belt 12 passes over the first belt roller 7 and the second belt roller 8. The first pressure sensor 1 and the second pressure sensor 2 are respectively placed on the back of the belt 12 near the front and rear ends of the first belt roller 7; the third pressure sensor 3 and the fourth pressure sensor 4 are respectively placed on the back of the belt 12 near the front and rear ends of the second belt roller 8. The platform 11 is placed below the first belt roller 7 and the second belt roller 8. The first emergency scale 5 and the second emergency scale 6 are also included. Scale 5, second emergency scale 6, and operating scale 10 are placed on platform 11. The output terminals of first pressure sensor 1 and second pressure sensor 2 are respectively connected to the input terminal of first emergency scale 5; the output terminals of third pressure sensor 3 and fourth pressure sensor 4 are respectively connected to the input terminal of second emergency scale 6; the output terminals of first emergency scale 5 and second emergency scale 6 are respectively connected to the input terminal of operating scale 10; the output terminals of first pressure sensor 1, second pressure sensor 2, third pressure sensor 3, fourth pressure sensor 4, first emergency scale 5, second emergency scale 6, and operating scale 10 are respectively connected to the input terminal of PLC wired controller 9; and first pressure sensor 1, second pressure sensor 2, third pressure sensor 3, and fourth pressure sensor 4 are placed on the back of belt 12 in a counterclockwise direction.

[0044] The automatic switching method for platform failure of the electronic belt scale based on pressure sensor of the present invention includes:

[0045] (a) Calculate the differences between the first pressure sensor 1, the second pressure sensor 2, the third pressure sensor 3, and the fourth pressure sensor 4 respectively.

[0046] IN1, IN2, IN3, and IN4 represent the weight outputs of the first pressure sensor 1, the second pressure sensor 2, the third pressure sensor 3, and the fourth pressure sensor 4, respectively. IN5 and IN6 represent the horizontal alarm value and the vertical alarm value, respectively. The horizontal alarm value IN5 is the difference between the two pressure sensors perpendicular to the running direction of the belt 12, and IN5 is 0.8-1.2 kg. IN6 is the difference between the two pressure sensors parallel to the running direction of the belt 12, and IN6 is 4.8-5.2 kg.

[0047]

[0048]

[0049]

[0050]

[0051] (ii) When the first pressure sensor 1 malfunctions, the PLC wired controller 9 will automatically switch.

[0052] The first pressure sensor 1 transmits its output to the PLC wired controller 9. When the output of the first pressure sensor 1 is one of the following two, the PLC wired controller 9 automatically switches the first emergency scale 5 to the second emergency scale 6.

[0053] (a) When the output position PIW282 of the first pressure sensor 1 is greater than 27648, or when the output position PIW280 of the first pressure sensor 1 is less than 200, the output of the first pressure sensor 1 will show a fault. At this time, the first emergency scale 5 connected to the first pressure sensor 1 will malfunction.

[0054] (b) When TEMP 14 ≥IN5 and TEMP 23 <IN5 and TEMP 12 If the output of the first pressure sensor 1 is ≥IN6, then the first emergency scale 5 connected to the first pressure sensor 1 will malfunction.

[0055] (iii) The second pressure sensor 2 is malfunctioning.

[0056] The second pressure sensor 2 transmits its output to the PLC wired controller 9. When the output of the second pressure sensor 2 is one of the following two, the PLC wired controller 9 automatically switches the first emergency scale 5 to the second emergency scale 6.

[0057] (c) When the output position PIW282 of the second pressure sensor 2 is greater than or equal to 27648, or when the output position PIW280 of the second pressure sensor 2 is less than or equal to 200, the output of the second pressure sensor 2 will show a fault. At this time, the first emergency scale 5 connected to the second pressure sensor 2 will malfunction.

[0058] (d) When TEMP 23 ≥IN5 and TEMP 14 <IN5 and TEMP 12 If the output of the second pressure sensor 2 is ≥IN6, then the output of the second pressure sensor 2 is faulty. At this time, the first emergency scale 5 connected to the second pressure sensor 2 will malfunction.

[0059] (iv) The third pressure sensor 3 is malfunctioning.

[0060] The third pressure sensor 3 transmits its output to the PLC wired controller 9. When the output of the third pressure sensor 3 is one of the following two, the PLC wired controller 9 automatically switches the second emergency scale 6 to the first emergency scale 5.

[0061] (e) When the output position PIW282 of the third pressure sensor 3 is ≥27648, or when the output position PIW280 of the third pressure sensor 3 is ≤200, the output of the third pressure sensor 3 will show a fault. At this time, the second emergency scale 6 connected to the third pressure sensor 3 will malfunction.

[0062] (f) When TEMP 23 ≥IN5 and TEMP 14 <IN6 and TEMP 34 If the output of the third pressure sensor 3 is ≥IN6, then the output of the third pressure sensor 3 is faulty. At this time, the second emergency scale 6 connected to the third pressure sensor 3 will malfunction.

[0063] (v) The fourth pressure sensor 4 is malfunctioning.

[0064] The fourth pressure sensor 4 transmits its output to the PLC wired controller 9. When the output of the fourth pressure sensor 4 is one of the following two, the PLC wired controller 9 automatically switches the second emergency scale 6 to the first emergency scale 5.

[0065] (g) When the output position PIW282 of the fourth pressure sensor 4 is ≥27648, or when the output position PIW280 of the fourth pressure sensor 4 is ≤200, the output of the fourth pressure sensor 4 will show a fault. At this time, the second emergency scale 6 connected to the fourth pressure sensor 4 will malfunction.

[0066] (h) When TEMP 14 ≥IN5 and TEMP 23 <IN5 and TEMP 34 If the output of the fourth pressure sensor 4 is ≥IN6, then the output of the fourth pressure sensor 4 is faulty. At this time, the second emergency scale 6 connected to the fourth pressure sensor 4 will also malfunction.

[0067] In steps (a) to (h) above, when the first emergency scale 5 or the second emergency scale 6 malfunctions and needs to be switched, the flow rate value of the operating scale 10 at the previous time when no malfunction occurred is replaced with the flow rate value of the first emergency scale 5 or the second emergency scale 6 to be used at this time.

[0068] (vi) No faults were found in the first pressure sensor 1, the second pressure sensor 2, the third pressure sensor 3, and the fourth pressure sensor 4.

[0069] When the first pressure sensor 1, the second pressure sensor 2, the third pressure sensor 3, and the fourth pressure sensor 4 are not faulty, the flow rate of the operating scale 10 is (flow rate of the first emergency scale 5 + flow rate of the second emergency scale 6) / 2, and the flow rate values ​​of the first emergency scale 5, the second emergency scale 6, and the operating scale 10 are stored and recorded in the database of the PLC wired controller 9. The PLC wired controller 9 automatically defaults to the input of the operating scale 10.

[0070] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic switching method for a faulty electronic belt scale based on a pressure sensor, wherein the electronic belt scale platform includes: The system consists of a first pressure sensor (1), a second pressure sensor (2), a third pressure sensor (3), a fourth pressure sensor (4), a first emergency scale (5), a second emergency scale (6), a first belt roller (7), a second belt roller (8), a PLC wire controller (9), a running scale (10), a platform (11), and a belt (12). The first belt roller (7) and the second belt roller (8) are placed parallel to each other. The belt (12) passes over the first belt roller (7) and the second belt roller (8). The first pressure sensor (1) and the second pressure sensor (2) are placed on the back of the belt (12) at the front and rear ends near the first belt roller (7), respectively. The third pressure sensor (3) and the fourth pressure sensor (4) are placed on the back of the belt (12) at the front and rear ends near the second belt roller (8), respectively. The platform (11) is placed on the first belt roller (7) and the second belt roller (8). Below, the first emergency scale (5), the second emergency scale (6), and the operating scale (10) are placed on the platform (11). The output terminals of the first pressure sensor (1) and the second pressure sensor (2) are respectively connected to the input terminal of the first emergency scale (5); the output terminals of the third pressure sensor (3) and the fourth pressure sensor (4) are respectively connected to the input terminal of the second emergency scale (6); the output terminals of the first emergency scale (5) and the second emergency scale (6) are respectively connected to the input terminal of the operating scale (10); the output terminals of the first pressure sensor (1), the second pressure sensor (2), the third pressure sensor (3), the fourth pressure sensor (4), the first emergency scale (5), the second emergency scale (6), and the operating scale (10) are respectively connected to the input terminal of the PLC wire controller (9); the feature is that the automatic switching method for platform faults of the electronic belt scale based on pressure sensors includes: (a) Calculate the differences between the first pressure sensor (1), the second pressure sensor (2), the third pressure sensor (3), and the fourth pressure sensor (4) respectively. IN1, IN2, IN3 and IN4 represent the weight output of the first pressure sensor (1), the second pressure sensor (2), the third pressure sensor (3) and the fourth pressure sensor (4) respectively, and IN5 and IN6 represent the horizontal alarm value and the vertical alarm value respectively. IN5 and IN6 are fixed values. ； (ii) When the first pressure sensor (1) malfunctions, the PLC wired controller (9) automatically switches. The first pressure sensor (1) transmits its output to the PLC wired controller (9). When the output of the first pressure sensor (1) is one of the following two, the PLC wired controller (9) automatically switches the first emergency scale (5) to the second emergency scale (6). (a) When the output position PIW282 of the first pressure sensor (1) is greater than 27648, or when the output position PIW280 of the first pressure sensor (1) is less than 200, the output of the first pressure sensor (1) will show a fault. At this time, the first emergency scale (5) connected to the first pressure sensor (1) will malfunction. (b) When TEMP 14 ≥IN5 and TEMP 23 <IN5 and TEMP 12 If the output of the first pressure sensor (1) is ≥IN6, then the first emergency scale (5) connected to the first pressure sensor (1) will malfunction. (iii) The second pressure sensor (2) is malfunctioning. The second pressure sensor (2) transmits its output to the PLC wired controller (9). When the output of the second pressure sensor (2) is one of the following two, the PLC wired controller (9) automatically switches the first emergency scale (5) to the second emergency scale (6). (c) When the output position PIW282 of the second pressure sensor (2) is greater than 27648, or when the output position PIW280 of the second pressure sensor (2) is less than 200, the output of the second pressure sensor (2) will show a fault. At this time, the first emergency scale (5) connected to the second pressure sensor (2) will malfunction. (d) When TEMP 23 ≥IN5 and TEMP 14 <IN5 and TEMP 12 If the output of the second pressure sensor (2) is ≥IN6, then the output of the second pressure sensor (2) is faulty. At this time, the first emergency scale (5) connected to the second pressure sensor (2) will malfunction. (iv) The third pressure sensor (3) is malfunctioning. The third pressure sensor (3) transmits its output to the PLC wired controller (9). When the output of the third pressure sensor (3) is one of the following two, the PLC wired controller (9) automatically switches the second emergency scale (6) to the first emergency scale (5). (e) When the output position PIW282 of the third pressure sensor (3) is ≥27648, or when the output position PIW280 of the third pressure sensor (3) is ≤200, the output of the third pressure sensor (3) will show a fault. At this time, the second emergency scale (6) connected to the third pressure sensor (3) will malfunction. (f) When TEMP 23 ≥IN5 and TEMP 14 <IN6 and TEMP 34 If the output of the third pressure sensor (3) is ≥IN6, then the output of the third pressure sensor (3) is faulty. At this time, the second emergency scale (6) connected to the third pressure sensor (3) will malfunction. (v) The fourth pressure sensor (4) is malfunctioning. The fourth pressure sensor (4) transmits its output to the PLC wired controller (9). When the output of the fourth pressure sensor (4) is one of the following two, the PLC wired controller (9) automatically switches the second emergency scale (6) to the first emergency scale (5). (g) When the output position PIW282 of the fourth pressure sensor (4) is ≥27648, or when the output position PIW280 of the fourth pressure sensor (4) is ≤200, the output of the fourth pressure sensor (4) will show a fault. At this time, the second emergency scale (6) connected to the fourth pressure sensor (4) will malfunction. (h) When TEMP 14 ≥IN5 and TEMP 23 <IN5 and TEMP 34 If the output of the fourth pressure sensor (4) is ≥IN6, then the output of the fourth pressure sensor (4) is faulty. At this time, the second emergency scale (6) connected to the fourth pressure sensor (4) will malfunction. (vi) No faults were found in the first pressure sensor (1), the second pressure sensor (2), the third pressure sensor (3), and the fourth pressure sensor (4). When the first pressure sensor (1), the second pressure sensor (2), the third pressure sensor (3) and the fourth pressure sensor (4) are not faulty, the PLC wire controller (9) automatically defaults to the input of the scale (10).

2. The automatic switching method for platform failure of the electronic belt scale based on a pressure sensor as described in claim 1, characterized in that: When the first pressure sensor (1), the second pressure sensor (2), the third pressure sensor (3) and the fourth pressure sensor (4) are not faulty, the flow rate of the operating scale (10) is (flow rate of the first emergency scale (5) + flow rate of the second emergency scale (6)) / 2. The flow rate values ​​of the first emergency scale (5), the second emergency scale (6) and the operating scale (10) are stored and recorded in the database of the PLC wire controller (9). When the first emergency scale (5) or the second emergency scale (6) is faulty and needs to be switched, the flow rate value of the operating scale (10) at the previous time when no fault occurred is used to replace the flow rate value of the first emergency scale (5) or the second emergency scale (6) to be used at this time.

3. The automatic switching method for platform failure of the electronic belt scale based on a pressure sensor as described in claim 2, characterized in that: The horizontal alarm value IN5 is the difference between two pressure sensors perpendicular to the running direction of the belt (12), and IN5 is 0.8-1.2 kg.

4. The automatic switching method for platform failure of the electronic belt scale based on a pressure sensor as described in claim 3, characterized in that: The vertical alarm value IN6 is the difference between two pressure sensors that are parallel to the running direction of the belt (12), and IN6 is 4.8-5.2 kg.

5. The automatic switching method for weighing platform failure of the electronic belt scale based on a pressure sensor as described in claim 4, characterized in that: The first pressure sensor (1), the second pressure sensor (2), the third pressure sensor (3) and the fourth pressure sensor (4) are placed on the back of the belt (12) in a counterclockwise direction.

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