High stability electronic belt scale

Abstract

This utility model relates to a high-stability electronic belt scale, including a weighing display instrument, a tension acquisition device, and a belt length change detection device in the weighing area. The belt length change detection device in the weighing area includes a contact length detection sensor and a non-contact length detection sensor. A temperature sensor is installed below the upward belt of the belt conveyor. The belt length change detection device and the temperature sensor are communicatively connected to the tension acquisition device, which is communicatively connected to the weighing display instrument. A speed sensor is installed on the downward belt of the belt conveyor. This utility model uses the tension acquisition device to calculate the change in belt length in the weighing area of ​​the conveyor at the edge of the weighing device and transmits this change in real time to the weighing display instrument for belt range coefficient correction. This eliminates the material flow measurement error caused by the change in belt length in the weighing area and ensures the measurement accuracy and stability of the belt scale in different temperature ranges.

Description

Technical Field

[0001] This utility model relates to the field of automatic weighing instrument technology, specifically a high-stability electronic belt scale. Background Technology

[0002] A belt scale is a metering device used to continuously weigh solid bulk materials during the conveying process of a belt conveyor. It can measure the instantaneous flow rate and cumulative amount of material passing through the belt conveyor without interrupting the material flow.

[0003] The typical measurement method used by belt scales is to use load cells and speed sensors to measure the instantaneous weight of the material along a certain length of belt and the belt travel or belt speed at the same moment, so as to obtain the flow rate of the material conveyed by the belt conveyor.

[0004] The formula for calculating its instantaneous flow rate (Q) is as follows:

[0005] Q = (W × V) ÷ L (unit: kg / s)

[0006] Where: W is the weight of the material measured by the load cell (kg).

[0007] V-belt speed (m / s)

[0008] L is the effective length of the weighing area (m).

[0009] As can be seen from the above formula, the change in the effective length of the weighing area L will affect the measurement accuracy and stability of the belt scale. The change in the effective length of the weighing area is affected by the conveyor belt and the weighing idler bracket. During use, the conveyor belt is affected by many factors such as its own material, ambient temperature, the type of conveyor tensioning device, and the material, which will cause the effective length of the weighing area to change. Abnormal operation of the weighing idler bracket will also lead to changes in the effective length of the weighing area. These changes directly affect the measurement accuracy of the belt scale.

[0010] After initial installation, belt scales require calibration with materials. During calibration, the effective length of the weighing area is L. Under normal use, due to external factors, the effective length of the weighing area changes to L + Δ. When the change in Δ affects the weighing accuracy of the belt scale beyond its allowable error range, recalibration is necessary. In practical applications, since the change in the effective length of the weighing area is unknown, periodic calibration is required to maintain the belt scale's measurement accuracy. This is mainly done through calibration tests with actual conveyed materials. This method is time-consuming, labor-intensive, and costly, impacting the normal operation of the conveyor. Furthermore, even with periodic calibration, it is difficult to guarantee the belt scale's measurement accuracy between calibrations. Utility Model Content

[0011] To address the problems existing in the prior art, this utility model provides a highly stable electronic belt scale. By detecting changes in the belt length in the weighing area in real time, the accuracy of the belt scale's measurement is monitored online, and its influencing factors are corrected in a timely manner, thereby improving the measurement accuracy and stability of the belt scale.

[0012] To achieve the above objectives, this utility model provides a high-stability electronic belt scale, comprising a weighing display instrument, a tension acquisition device, and a belt length change detection device in the weighing area. The belt length change detection device is installed below the upward belt of the belt conveyor. A weighing bridge and weighing idlers are also installed below the upward belt of the belt conveyor. The weighing sensors of the weighing bridge and weighing idlers are communicatively connected to the weighing display instrument. The belt length change detection device in the weighing area includes a contact length detection sensor and a non-contact length detection sensor. A temperature sensor is installed below the upward belt of the belt conveyor. The belt length change detection device and the temperature sensor are communicatively connected to the tension acquisition device, which is also communicatively connected to the weighing display instrument. A speed sensor is installed on the downward belt of the belt conveyor, and this speed sensor is communicatively connected to the weighing display instrument.

[0013] In addition, the high-stability electronic belt scale proposed according to the above embodiments of this utility model may also have the following additional technical features:

[0014] As a further improvement of this utility model, the non-contact length detection sensor includes an ultrasonic sensor or a laser sensor.

[0015] As a further improvement of this utility model, the ultrasonic sensor or laser sensor is equipped with a protective shell.

[0016] As a further improvement of this utility model, the contact length detection sensor is a linear displacement sensor or an encoder.

[0017] As a further improvement of this utility model, the linear displacement sensor is an inductive displacement sensor or a capacitive displacement sensor.

[0018] As a further improvement of this utility model, the encoder is a linear encoder or a rotary encoder.

[0019] By employing the above-mentioned solution, this utility model has at least the following advantages: By utilizing a tension acquisition device, the change in belt length in the weighing area of ​​the conveyor is calculated at the edge of the belt scale weighing device, and this change is transmitted in real time to the weighing display instrument for correction of the belt range coefficient. This eliminates the material flow measurement error caused by the change in belt length in the weighing area, ensuring the measurement accuracy and stability of the belt scale within different temperature ranges; it simplifies data acquisition, processing, and analysis under the influence of multiple factors, realizes real-time and accurate measurement monitoring and control, and greatly improves the intelligence of belt scale measurement. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a high-stability electronic belt scale;

[0021] Figure 2 This is a structural diagram of the contact length detection sensor used in the weighing area belt length change detection device of a high-stability electronic belt scale.

[0022] Figure 3 This is a structural diagram of the non-contact length detection sensor used in the belt length change detection device of the weighing area of ​​a high-stability electronic belt scale.

[0023] In the diagram: 1. Weighing display instrument, 2. Tension acquisition device, 3. Belt length change detection device in weighing area, 31. Contact length detection sensor, 32. Non-contact length detection sensor, 4. Weighing sensor, 5. Weighing bridge, 6. Weighing idler, 7. Speed ​​sensor, 8. Temperature sensor, 9. Belt conveyor. Detailed Implementation

[0024] The high-stability electronic belt scale of this utility model is described below with reference to the accompanying drawings.

[0025] In Embodiment 1 of this application, as Figure 1As shown, this high-stability electronic belt scale (hereinafter referred to as "the present invention") includes a weighing display instrument 1, a tension acquisition device 2, a belt length change detection device 3 in the weighing area, a contact length detection sensor 31, a non-contact length detection sensor 32, a weighing sensor 4, a weighing bridge 5, a weighing idler 6, a speed sensor 7, a temperature sensor 8, and a belt conveyor 9. The belt conveyor 9 has the belt length change detection device 3 installed below the upward belt, and the weighing bridge 5 and the weighing idler 6 installed below the upward belt. The weighing sensors 4 of the heavy-duty bridge frame 5 and the weighing idler roller 6 are communicatively connected to the weighing display instrument 1. The belt length change detection device 3 in the weighing area includes a contact length detection sensor 31 and a non-contact length detection sensor 32. A temperature sensor 8 is installed below the upward belt of the belt conveyor 9. The belt length change detection device 3 and the temperature sensor 8 are communicatively connected to the tension acquisition device 2, which is also communicatively connected to the weighing display instrument 1. A speed sensor 7 is installed on the downward belt of the belt conveyor 9, and it is communicatively connected to the weighing display instrument 1. The non-contact length detection sensor 32 includes an ultrasonic sensor or a laser sensor. Both the ultrasonic sensor and the laser sensor are equipped with protective housings.

[0026] This second embodiment is basically the same in structure as the first embodiment, the difference being that, as Figure 2 As shown, the contact length detection sensor 31 is a linear displacement sensor or an encoder. The linear displacement sensor is an inductive displacement sensor or a capacitive displacement sensor, and the encoder is a linear encoder or a rotary encoder.

[0027] The weighing area belt length change detection device 3 includes a contact length detection sensor 31, a non-contact length detection sensor 32, a temperature sensor 8AI, and a data acquisition instrument 2; the contact length detection sensor 31 or the non-contact length detection sensor 32 is installed in the weighing area at the location where the conveyor belt changes the most easily; the temperature sensor 8 is used to collect the temperature data at its location on the belt in real time and send the collected temperature data signal to the tension acquisition instrument 2 in real time.

[0028] The tension acquisition device 2 is used to receive signals from the belt length change detection device 3 and the temperature sensor 8 in the weighing area. It processes, compares, and analyzes the received data signals to determine whether the belt length change causes the belt scale to exceed the measurement tolerance. If the tolerance is exceeded, the signal is promptly transmitted to the weighing display instrument 1 for alarm or correction compensation, thereby ensuring the stability of the belt scale's measurement accuracy.

[0029] To use, simply install the high-stability electronic belt scale and connect the corresponding components.

[0030] When this utility model is used, its specific operation is as follows:

[0031] (1) Initially install and calibrate the belt scale weighing device. The weighing display instrument 1 records its range coefficient Q, the initial value of the weighing sensor 4, and the temperature recorded by the tension acquisition device 2. Allow the belt scale weighing device to run unloaded for 2 to 50 hours to obtain the average signal value AD1 output by the weighing sensor 4 during the unloaded operation of the belt scale. 初始 The average signal value AD2 of the belt length change in the weighing area recorded by the contact length detection sensor 31, the non-contact length detection sensor 32, and the tension acquisition device 2. 初始 ;

[0032] (2) The temperature during the operation of the belt scale is collected by the temperature sensor 8; the operating temperature range of the belt scale is divided into m temperature zones, and the weighing interval in each temperature zone is divided into S equal or unequal parts according to the maximum weighing capacity of the belt scale, i.e., F1, F2...Fs; when the belt scale is operating normally, the average signal value output by the weighing sensor 4 is recorded for a period of time in each weighing interval, i.e., the average signal value output by the weighing sensor 4 in the F1 weighing interval is AD1C1, and the average signal value of the belt length change in the weighing area is AD2C1; the average signal value output by the weighing sensor 4 in the F2 weighing interval is AD1C2, and the average signal value of the belt length change in the weighing area is AD2C2; ..., the average signal value output by the weighing sensor 4 in the Fs weighing interval is AD1CS, and the average signal value of the belt length change is AD2CS.

[0033] (3) Establish the standard ratio coefficients for each weighing interval in each temperature zone using the weighing display instrument 1:

[0034] The standard ratio coefficient of the F1 weighing interval K1 = (AD2) C1 -AD2 初始 ) / (AD1 C1 -AD1 初始 );

[0035] The standard ratio coefficient of the F2 weighing interval K2 = (AD2) C2 -AD2 初始 ) / (AD1 C2 -AD1 初始 ); ......;

[0037] The standard ratio coefficient K of the Fs weighing interval s =(AD2) Cs -AD2 初始 ) / (AD1 Cs -AD1 初始 );

[0038] (4) Subsequently, during the operation of the electronic belt scale, the weighing display instrument 1 and the tension acquisition device 2 continue to record the average signal value output by the weighing sensor 4 over a period of time in each weighing interval of each temperature zone, that is, the average signal value AD1 output by the weighing sensor 4 in the F1 weighing interval. Z1 The average signal value AD2 of the change in belt length in the weighing area Z1 The average signal value AD1 output by the load cell 4 in the F2 weighing range. Z2 The average signal value AD2 of the belt length change Z2 ;......,F s The average signal value AD1 output by the weighing range load cell 4 ZS The average signal value AD2 of the change in belt length in the weighing area ZS ;

[0039] (5) Calculate the real-time ratio coefficient of each weighing interval in each temperature zone using the weighing display instrument:

[0040] The real-time ratio coefficient P1 of the F1 weighing interval is P1 = (AD2) Z1 -AD2 初始 ) / (AD1 Z1 -AD1 初始 );

[0041] The real-time ratio coefficient P2 of the F2 weighing interval is P2 = (AD2) Z2 -AD2 初始 ) / (AD1 Z2 -AD1 初始 ); ......;

[0043] F s Real-time ratio coefficient P of the weighing range s =(AD2) Zs -AD2 初始 ) / (AD1 Zs -AD1 初始 );

[0044] (6) Correct the range coefficient of each weighing interval in each temperature zone using the weighing display instrument 1 to obtain the range coefficient of each temperature zone.

[0045] Actual range coefficients for each weighing interval in the domain:

[0046] The actual range coefficient of the F1 weighing interval is Q1 = Q × (1 + Y1 × (P1 - K1) / K1);

[0047] The actual range coefficient of the F2 weighing interval is Q2 = Q × (1 + Y2 × (P2 - K2) / K2); ......;

[0049] F s The actual range coefficient Q of the weighing range s =Q×(1+Y) s ×(P s -K s ) / K s );

[0050] In the formula, Y1, Y2…Y s The tension influence value set for each weighing interval of each temperature zone and weighing display instrument 1;

[0051] (7) The weighing display instrument 1 calculates the amount of material according to the actual range coefficient of each weighing interval obtained in step (6);

[0052] (8) Repeat steps (5) to (7) until the belt scale weighing device is recalibrated and the standard ratio coefficient needs to be re-established, then return to step (1).

[0053] In summary, the high-stability electronic belt scale of this utility model utilizes the tension collector 2 to calculate the change in belt length in the weighing area of ​​the conveyor at the edge of the belt scale's weighing device, and transmits this change in real time to the weighing display instrument 1 for correction of the belt range coefficient. This eliminates the material flow measurement error caused by the change in belt length in the weighing area, ensuring the measurement accuracy and stability of the belt scale within different temperature ranges. It simplifies data acquisition, processing, and analysis under the influence of multiple factors, realizes real-time and accurate measurement monitoring and control, and greatly improves the intelligence of belt scale measurement.

[0054] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity. Any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A high-stability electronic belt scale, comprising a weighing display instrument (1), a tension acquisition device (2), and a belt conveyor (9), wherein a belt length change detection device (3) is provided below the upward belt of the belt conveyor (9), and a weighing bridge (5) and weighing idlers (6) are provided below the upward belt of the belt conveyor (9), and the weighing sensors (4) of the weighing bridge (5) and the weighing idlers (6) are communicatively connected to the weighing display instrument (1), characterized in that, The weighing area belt length change detection device (3) includes a contact length detection sensor (31) and a non-contact length detection sensor (32). A temperature sensor (8) is installed below the upward belt of the belt conveyor (9). The weighing area belt length change detection device (3) and the temperature sensor (8) are connected to the tension acquisition device (2). The tension acquisition device (2) is connected to the weighing display instrument (1). A speed sensor (7) is installed on the downward belt of the belt conveyor (9). The speed sensor (7) is connected to the weighing display instrument (1).

2. The high stability electronic belt scale of claim 1, wherein, The non-contact length detection sensor (32) is an ultrasonic sensor or a laser sensor.

3. The high stability electronic belt scale of claim 2 wherein, Both the ultrasonic sensor and the laser sensor are equipped with protective housings.

4. The high stability electronic belt scale of claim 1 wherein, The contact length detection sensor (31) mentioned above is a linear displacement sensor or an encoder.

5. The high-stability electronic belt scale according to claim 4, characterized in that, The linear displacement sensor mentioned above is either an inductive displacement sensor or a capacitive displacement sensor.

6. The high stability electronic belt scale of claim 4 wherein, The encoder described is either a linear encoder or a rotary encoder.

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