A real-time dynamic calibration electronic belt scale assembly and its calibration method

Abstract

The present invention relates to a real-time dynamic calibration electronic belt scale assembly and a calibration method thereof. Among them, a real-time dynamic calibration electronic belt scale assembly includes a belt disposed on the electronic belt scale and a circulating chain code device disposed above the electronic belt scale. The circulating chain code device includes a chain code disposed above the belt, conveying rollers and weighing rollers are disposed below the belt, and a weighing scale frame is disposed below the weighing rollers. The circulating chain code device is disposed above the weighing scale frame. A plurality of groups of the weighing rollers are arranged along the running direction of the belt. A chain code speed measuring device is disposed inside the circulating chain code device, and a belt speed measuring device is disposed inside the electronic belt scale. The plurality of groups of weighing scale frames, the chain code speed measuring device, and the belt speed measuring device are connected to a weighing instrument through a communication cable.

Description

Technical Field

[0001] The present invention relates to a real-time dynamic calibration electronic belt scale assembly and a calibration method thereof. Background Art

[0002] The working principle of an electronic belt scale is to measure the material weight at a certain cross-section of the belt and the current belt speed, calculate the instantaneous flow rate based on this, and obtain the belt cargo transportation volume within a certain period of time by integrating the flow rate over time. The material weight is transmitted to the measuring device through the belt, and the belt tension, hardness, ambient temperature, etc. directly affect the weighing result, and these factors (belt tension, hardness, ambient temperature, etc.) have a greater impact on the weighing accuracy. Currently, the technical solutions to solve this problem generally use a circulating chain code or calibrate the hopper scale and the belt, and correct the metering parameters of the electronic belt scale according to the calibration results to reduce the metering error of the belt scale.

[0003] Since the above calibration has a high operating cost and is cumbersome to implement, it is difficult to perform frequently. The belt operating conditions, environment, etc. during calibration are inconsistent with those during metering, resulting in poor weighing accuracy of the belt scale. Summary of the Invention

[0004] The present invention discloses a real-time dynamic calibration electronic belt scale assembly and a calibration method thereof, which solve the problems proposed in the background art.

[0005] To solve the above technical problems, the present invention is achieved through the following technical solutions: A real-time dynamic calibration electronic belt scale assembly includes a belt disposed on the electronic belt scale and a circulating chain code device disposed above the electronic belt scale. The circulating chain code device includes a chain code disposed above the belt, a conveying idler and a weighing idler disposed below the belt, a weighing scale frame disposed below the weighing idler, the circulating chain code device is disposed above the weighing scale frame, a plurality of groups of the weighing idlers are disposed along the running direction of the belt, a chain code speed measuring device is disposed inside the circulating chain code device, a belt speed measuring device is disposed inside the electronic belt scale, and the plurality of groups of weighing scale frames, chain code speed measuring devices, and belt speed measuring devices are connected to a weighing instrument through a communication cable.

[0006] Further, at least two groups of the weighing idlers are provided, each group of weighing idlers includes two adjacent pairs of weighing idlers, an A-group weighing scale frame and a B-group weighing scale frame are sequentially disposed below the two groups of weighing idlers, and the circulating chain code device is disposed above the A-group weighing scale frame.

[0007] Further, the distances between adjacent conveying idlers, between adjacent weighing idlers, between adjacent conveying idlers and weighing idlers, and between adjacent weighing idlers and conveying idlers are equal.

[0008] Further preferably, a chain code cleaning device is disposed on the side of the circulating chain code device.

[0009] Further preferably, the circulating chain code device is arranged in the incoming material direction of the belt of the electronic belt scale.

[0010] Further preferably, a flexible panel is arranged on the chain code surface of the circulating chain code device.

[0011] Further preferably, the distance between the weighing scale frames of group A and group B is equal to the length of the bottom of the circulating chain code device.

[0012] A calibration method for a real-time dynamic calibration electronic belt scale assembly includes the following steps:

[0013] 1), Measuring values Fa1 and Fb1 of the weighing scale frames of group A and group B in the no-load running state of the belt, and obtaining the basic error values △a and △b of the weighing scale frames of group A and group B;

[0014] 2), When the belt is normally transporting goods, the chain code in the circulating chain code device is placed on the goods and transported synchronously with the goods. The running speeds V of the chain code and the belt are measured by the chain code belt speed measuring device and the belt speed measuring device 链码 , V 皮带 ;

[0015] 3), Measuring values Fa2 and Fb2 of the weighing scale frames of group A and group B in the running state of the belt transporting goods. Based on the basic error values △a, △b, and the weight per unit length M of the circulating chain code device m , obtaining the influence coefficient α of the goods flow rate of the weighing scale frames of group A and group B = ((Fa2 - △a) - (Fb2 - △b)) × V 皮带 ) / (M m × V 链码 );

[0016] From the above data and the effective belt calculation length L of the electronic belt scale frame, it can be known that the actual flow rate Mh of the calculated goods = (Fb2 - △b) / α / L × V 皮带 .

[0017] Compared with the prior art, the present invention can obtain the following technical effects:

[0018] 1. Through real-time dynamic calibration, calibration and metering are carried out synchronously, and the influence of belt tension on the (electronic) belt scale is comprehensively corrected. The confidence level of the material calibration of the (electronic) belt scale is high, effectively avoiding the influence of the difference in the operating environment on the metering accuracy in the case where the metering and calibration of the existing electronic belt scale are carried out separately.

[0019] 2. When starting, no-load running measurement is carried out, and there is no need to perform independent zero calibration of the (electronic) belt scale, reducing the usage difficulty.

[0020] 3. It has less investment, smaller floor space and is easier to implement than ordinary physical calibration devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are provided to further understand the present invention and form a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 Schematic diagram of the structure of a real-time dynamic calibration electronic belt scale of the present invention;

[0023] Wherein: 1 - Group A weighing scale frame; 2 - weighing idler; 3 - conveying idler; 4 - Group B weighing scale frame; 5 - circulating chain code device; 6 - chain code speed measuring device; 7 - weighing instrument; 8 - belt speed measuring device; 9 - chain code cleaning device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following will describe the embodiments of the present invention in detail in conjunction with the drawings.

[0025] A real-time dynamic calibration electronic belt scale assembly of the present invention includes a belt provided on the electronic belt scale and a circulating chain code device 5 provided above the electronic belt scale. The circulating chain code device 5 includes a chain code provided above the belt. It is characterized in that: a conveying idler 3 and a weighing idler 2 are provided below the belt, a weighing scale frame is provided below the weighing idler 2, the circulating chain code device 5 is provided above the weighing scale frame, a plurality of groups of weighing idlers 2 are arranged along the running direction of the belt, a chain code speed measuring device 6 is provided inside the circulating chain code device 5, a belt speed measuring device 8 is provided inside the electronic belt scale, and the weighing scale frame, the chain code speed measuring device 6, and the belt speed measuring device 8 are connected to the weighing instrument 7 through a communication cable.

[0026] Further, at least two groups of weighing idlers 2 are provided. Each group of weighing idlers 2 includes two adjacent symmetric heavy-duty idlers 2. A weighing scale frame is provided below each group of weighing idlers 2, that is, referring to Figure 1 , a Group A weighing scale frame 1 and a Group B weighing scale frame 2 are sequentially provided below the two groups of weighing idlers 2, and the circulating chain code device 5 is provided above the Group A weighing scale frame 1.

[0027] That is, each weighing scale frame in the two groups of weighing scale frames 1 and 4 of A and B has a double weighing idler 2 structure.

[0028] Preferably, referring to Figure 1 , the distances between adjacent conveying idlers 3, between adjacent weighing idlers 2, between adjacent conveying idlers 3 and weighing idlers 2, and between adjacent weighing idlers 2 and conveying idlers 3 are equal.

[0029] Furthermore, a chain code cleaning device 9 is provided on the side of the circulating chain code device 5.

[0030] Preferably, the circulating chain code device 5 is arranged in the incoming material direction of the belt of the electronic belt scale.

[0031] Preferably, a flexible panel is arranged on the chain code surface of the circulating chain code device 5.

[0032] The circulating chain code device 5 is used to make a fixed difference in the measured weights of the two groups of weighing scale frames 1 and 4 of groups A and B.

[0033] Furthermore, the distance between the weighing scale frame 1 of group A and the weighing scale frame 2 of group B is equal to the length of the bottom of the circulating chain code device 5.

[0034] Refer to Figure 1 , the two groups of weighing scale frames 1 and 4 of groups A and B and the weighing idlers 2 are arranged in sequence along the belt running direction, and are separated by the conveying idlers 3 in the middle. A circulating chain code device 5 is arranged above the weighing scale frame 1 of group A, a chain code speed measuring device 6 is arranged inside the circulating chain code device 5, and a belt speed measuring device 8 is arranged inside the belt. The weighing scale frame 1 of group A, the weighing scale frame 4 of group B, the chain code speed measuring device 6, and the belt speed measuring device 8 are connected to the weighing instrument 7 through communication cables.

[0035] A method for weighing and measuring the components of an electronic belt scale with real-time dynamic calibration according to the present invention is as follows:

[0036] (Weighing) The measured values Fa1 and Fb1 of the weighing scale frames 1 and 4 of groups A and B in the state of the belt running idly are obtained, and the basic error values △a and △b of the weighing scale frames of groups A and B are obtained.

[0037] When the belt is normally conveying goods, the chain code in the circulating chain code device 5 is placed on the goods and conveyed synchronously with the goods. The running speeds V of the chain code and the belt are measured by the chain code belt speed measuring device 6 and the belt speed measuring device 8 链码 , V 皮带 .

[0038] (Weighing) The measured values Fa2 and Fb2 of the weighing scale frames 1 and 4 of groups A and B in the state of the belt conveying goods are obtained. Based on the basic error values △a, △b, and the weight M per unit length of the circulating chain code device 5 m , the influence coefficient α of the goods flow rate of the weighing scale frames 1 and 4 of groups A and B is obtained as α = ((Fa2 - △a) - (Fb2 - △b)) × V 皮带 ) / (M m × V 链码 ).

[0039] From the above data and the effective belt calculation length L of the (electronic belt scale) scale frame, it can be known that the actual flow rate Mh of the calculated goods is Mh = (Fb2 - △b) / α / L × V 皮带 .

[0040] The following is an application calculation in combination with the above structure and method:

[0041] The data measurement results are as follows:

[0042] After the installation of the electronic belt scale assembly equipment: the weight per unit length Mm of the circulating chain code device 5 is 20 kg / m; the effective belt calculation length L of the scale frame (electronic belt scale) is 2 m.

[0043] The measured values in the belt running state are shown in the following table.

[0044]

[0045] It can be calculated from the above table that:

[0046] The basic error value △a of the weighing scale frame 1 in Group A is 1.34 kg.

[0047] The basic error value △b of the weighing scale frame 4 in Group B is 2.75 kg.

[0048] The influence coefficient α of the cargo flow rate = ((229.17 - 2.75) - (189.00 - 1.34)) * 3.05 / (20 * 2 * 3.15) = 0.938238.

[0049] The actual flow rate Mh of the cargo = (189.00 - 1.34) / 0.938238 / 2 * 3.05 = 610.0403 kg / s.

[0050] The theoretical flow rate is 100 * 2 * 3.05 = 610.00 kg / s.

[0051] Comparing the actual flow rate and the theoretical flow rate, it can be seen that the metering accuracy of the present invention is high.

[0052] The present invention has the following advantages compared with the prior art:

[0053] 1. Through real-time dynamic calibration, calibration and metering are carried out simultaneously, the influence of belt tension on the (electronic) belt scale is comprehensively corrected, the confidence level of the material calibration of the (electronic) belt scale is high, and the influence of the difference in the operating environment on the metering accuracy in the case where the metering and calibration of the existing electronic belt scale are carried out separately is effectively avoided.

[0054] 2. During startup, no-load running measurement is carried out, and there is no need to perform independent zero calibration of the (electronic) belt scale, which reduces the usage difficulty.

[0055] 3. It requires less investment, occupies less floor space and is easier to implement compared with ordinary physical calibration devices.

[0056] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above examples and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, various changes and improvements will occur to the present invention, and these changes and improvements fall within the scope of the present invention claimed. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. A calibration method for a real-time dynamic calibration electronic belt scale assembly, including a belt disposed on the electronic belt scale and a circulating chain code device (5) disposed above the electronic belt scale. The circulating chain code device (5) includes a chain code disposed above the belt, and is characterized in that: Beneath the belt, conveyor idler rollers (3) and weighing idler rollers (2) are provided. Beneath the weighing idler rollers (2), a weighing scale frame is provided. The circulating chain code device (5) is arranged above the weighing scale frame. A plurality of groups of the weighing idler rollers (2) are arranged along the running direction of the belt. A chain code speed measuring device (6) is arranged inside the circulating chain code device (5), and a belt speed measuring device (8) is arranged inside the electronic belt scale. A plurality of groups of weighing scale frames, the chain code speed measuring device (6), and the belt speed measuring device (8) are connected to a weighing instrument (7) through communication cables; At least two groups of the weighing idler rollers (2) are provided. Beneath the two groups of weighing idler rollers (2), a group A weighing scale frame (1) and a group B weighing scale frame (4) are sequentially arranged; It includes the following steps: 1). Measuring values Fa1 and Fb1 of the group A and group B weighing scale frames (1, 4) in the no-load running state of the belt, and obtaining the basic error values △a and △b of the group A and group B weighing scale frames; 2), The belt normally conveys goods, and the chain code in the circulating chain code device (5) is placed on the goods and conveyed synchronously with the goods. The running speeds V of the chain code and the belt are measured by the chain code speed measuring device (6) and the belt speed measuring device (8). 链码 , V 皮带 ; 3), the measured values Fa2 and Fb2 of the weighing scale frames (1, 4) of Group A and Group B for the operating state of belt-conveyed goods, based on the basic error values △a, △b, and the weight per unit length M of the circulating chain code device (5) m , obtain the influence coefficient α of the goods flow rate of the weighing scale frames (1, 4) of Group A and Group B as α = (((Fa2 - △a) - (Fb2 - △b)) × V 皮带 ) / (M m × V 链码 ); From the above data and the effective belt calculation length L of the electronic belt scale, it can be known that the actual flow rate Mh of the calculated goods = (Fb2 - △b) / α / L×V 皮带 .

2. The calibration method for a real-time dynamic calibration electronic belt scale assembly according to claim 1, characterized in that: Each group of weighing idler rollers (2) includes two adjacent symmetric heavy-duty idler rollers (2). The circulating chain code device (5) is arranged above the group A weighing scale frame (1).

3. The calibration method for a real-time dynamic calibration electronic belt scale assembly according to claim 1, characterized in that: The distances between adjacent conveyor idler rollers (3), between adjacent weighing idler rollers (2), between adjacent conveyor idler rollers (3) and weighing idler rollers (2), and between adjacent weighing idler rollers (2) and conveyor idler rollers (3) are equal.

4. The calibration method for a real-time dynamic calibration electronic belt scale assembly according to claim 1, characterized in that: A chain code cleaning device (9) is arranged on the side of the circulating chain code device (5).

5. The calibration method for a real-time dynamic calibration electronic belt scale assembly according to claim 1, characterized in that: The circulating chain code device (5) is arranged in the incoming material direction of the belt of the electronic belt scale.

6. The calibration method for a real-time dynamic calibration electronic belt scale assembly according to claim 1, characterized in that: A flexible panel is arranged on the surface of the chain code of the circulating chain code device (5).

7. The calibration method for a real-time dynamic calibration electronic belt scale assembly according to claim 1, characterized in that: The distance between the group A weighing scale frame (1) and the group B weighing scale frame (4) is equal to the length of the bottom of the circulating chain code device (5).

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