A wind-guided high-speed belt scale

Abstract

The present invention discloses a wind-guided high-speed belt scale, which relates to the field of weighing technology and includes a conveyor belt group and an air duct. The conveyor belt group consists of a first conveyor belt, a second conveyor belt, and a third conveyor belt. The first conveyor belt, the second conveyor belt, and the third conveyor belt are arranged side by side. The second conveyor belt is located in the inner cavity of the air duct. Objects located on the second conveyor belt are weighed by a weighing unit. The air duct is provided with a fan group for generating wind force so that the wind speed at each point on the second conveyor belt is consistent with the speed of the second conveyor belt. The present invention further discloses individual fan groups respectively arranged on both sides of the air duct. The stable wind generated by the square fans through the rectifier block can be merged into an air flow with uniform and stable wind speed at each point inside the air duct above the second conveyor belt weighing platform. The air flow is the same as the conveying speed of the second conveyor belt, thereby avoiding the influence of air flow on the weighing of objects during weighing.

Description

Technical Field

[0001] The invention relates to the technical field of weighing, in particular to an air-guided high-speed belt scale. Background Art

[0002] A belt scale is an automatic weighing instrument that continuously weighs bulk materials on a conveyor belt without the need to subdivide the mass or interrupt the movement of the conveyor belt. It is mainly classified by load carrier: weighing table load carrier, conveyor load carrier; and by belt speed: single-speed belt scale, variable-speed belt scale.

[0003] When weighing an object, the object moves on the conveyor belt, and the sensor on the conveyor belt senses the object and starts the scale to weigh the object. However, when the object moves on the conveyor belt, when the speed increases, the influence of the air on the weighing will increase. For some objects moving at high speed, the air will lift or press down its head, causing the weight measurement to be inaccurate, affecting the weighing of the object. In order to avoid the influence of wind force on the weighing of objects during the conveyance process, a wind-guided high-speed belt scale is provided. Summary of the Invention

[0004] The purpose of the present invention is to provide a wind-guided high-speed belt scale in order to avoid the influence of wind force on the weighing of objects during the transportation process.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a wind-guided high-speed belt scale, comprising a conveyor belt group and an air guide duct, wherein the conveyor belt group is composed of a first conveyor belt, a second conveyor belt, and a third conveyor belt, wherein the first conveyor belt, the second conveyor belt, and the third conveyor belt are arranged side by side, the second conveyor belt is located in the inner cavity of the air guide duct, and objects located on the second conveyor belt are weighed by a weighing unit, and a fan group is provided at one end of the air guide duct away from the conveying direction of the second conveyor belt, for generating wind force so that the wind speed at each point on the second conveyor belt is consistent with the speed of the second conveyor belt;

[0006] An anemometer for observing the wind speed of the second conveyor belt is installed at the air outlet end of the air guide pipe to automatically control the air outlet volume of the fan group through feedback.

[0007] As a further solution of the present invention: the two groups of fan groups are respectively arranged on both sides of the air duct, and the two groups of fan groups have inward bevels.

[0008] As a further solution of the present invention: the fan group is composed of three stacked square fans, and a rectifier block is provided at the front end of the square fan. The rectifier block is composed of vertical square tubes with the same width and height as the fan group and is in a grid shape, and the front end of the rectifier block is an oblique cut.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] By setting up a fan group, stable wind can be generated, which can be combined into an air flow with uniform and stable wind speed at each point inside the air duct above the second conveyor belt weighing platform. The air flow is the same as the conveying speed of the second conveyor belt, which makes it convenient to make the air flow speed around the object consistent with the speed of the conveyor belt when the object is weighed, thereby avoiding the influence of air flow on the weighing of the object during weighing. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the present invention;

[0012] Figure 2 This is a schematic diagram of the installation of the fan assembly of the present invention;

[0013] Figure 3 Schematic diagram of automatic wind speed control of the present invention.

[0014] In the figure: 1. Conveyor belt assembly; 101. First conveyor belt; 102. Second conveyor belt; 103. Third conveyor belt; 201. Infrared sensor; 202. Weighing sensor; 203. Signal processor; 3. Air duct; 4. Fan assembly; 401. Square fan; 402. Rectifier block; 403. Anemometer. DETAILED DESCRIPTION

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0016] See also Figure 1-Figure 3 In an embodiment of the present invention, a wind-guided high-speed belt scale includes a conveyor belt group 1 and an air guide duct 3, characterized in that the conveyor belt group 1 is composed of a first conveyor belt 101, a second conveyor belt 102 and a third conveyor belt 103, the first conveyor belt 101, the second conveyor belt 102 and the third conveyor belt 103 are distributed side by side, the second conveyor belt 102 is located in the inner cavity of the air guide duct 3, and the objects located on the second conveyor belt 102 are weighed by a weighing unit. A fan group 4 is provided at one end of the air guide duct 3 away from the conveying direction of the second conveyor belt 102, which is used to generate wind force so that the wind speed at each point on the second conveyor belt 102 is consistent with the speed of the second conveyor belt 102.

[0017] In this embodiment, as objects move along the conveyor belt, as their speed increases, the effect of air on weighing increases. For some objects moving at high speed, the air may lift or press down their heads, causing inaccurate weight measurement and affecting the weighing of the objects. To avoid the effect of wind on weighing during the conveying process, this solution provides an air duct 3 and installs fan groups 4 on both sides of the air duct 3. These two fan groups 4 generate stable wind within the air duct 3, which then converges into an air flow with uniform and stable wind speed at each point within the air duct 3. This air flow is made to be the same speed as the conveying speed of the second conveyor belt 102. This facilitates the consistency of the air flow speed around the objects with the speed of the conveyor belt when weighing the objects, thus avoiding the effect of air flow on the weighing of the objects during weighing.

[0018] Specifically, the air-guided high-speed belt scale mainly includes a conveyor belt group 1, a weighing unit, an air duct 3 and two sets of fan groups 4. The conveyor belt group 1 is composed of a first conveyor belt 101, a second conveyor belt 102 and a third conveyor belt 103 arranged side by side. An air duct 3 is set on the outside of the second conveyor belt 102, and two sets of fan groups 4 are set on the air duct 3. The two sets of fan groups 4 are used to generate stable wind in the air duct 3. When the items are conveyed on the second conveyor belt 102, the air flow generated by the fan group 4 is consistent with the linear speed of the second conveyor belt 102. At this time, for the items, the surrounding air is still and no additional push or pull force is generated on the items, so that the weighing unit signal is not affected and the correct weight measurement is obtained.

[0019] It should be noted that the weighing unit includes an infrared sensor 201 located between the first conveyor belt 101 and the second conveyor belt 102. A weighing sensor 202 is mounted on the second conveyor belt 102. The infrared sensor 201 and weighing sensor 202 are connected to a signal processor 203 via wires. The first, second, and third conveyor belts 101, 102, and 103 are precision conveyor belts with minimal vibration. When an object passes through the infrared sensor 201, a signal is generated. When an object passes on the second conveyor belt 102, a signal is generated from the weighing sensor 202. This signal is fed into the signal processor 203, which, after dynamic calibration and calculation, outputs the weight of the object passing through.

[0020] Please refer to Figure 1-3 The two fan groups 4 are respectively arranged on both sides of the air duct 3, and the two fan groups 4 have an inward bevel; the fan group 4 is composed of three stacked square fans 401, and a rectifier block 402 is provided at the front end of the square fan 401. The rectifier block 402 is composed of vertical square tubes with the same width and height as the fan group 4 and is in a grid shape, and the front end of the rectifier block 402 is an oblique cut; the air outlet end of the air duct 3 is installed with an anemometer 403 for observing the wind speed of the second conveyor belt 102, and the feedback automatically controls the air output of the fan group 4.

[0021] In this embodiment: three square fans 401 are stacked to form a fan group 4, and a vertical grid tube with the same width and height as the fan group 4 is cut at an angle at the front end to form a grid rectifier block 402; during installation, first adjust the driving power of the two groups of fan groups 4 to make the air outlet on both sides of the air duct 3 consistent, and then use the anemometer 403 to observe the wind speed at various locations while adjusting the installation angles on both sides of the air duct 3 to make the wind speed at various points on the second conveyor belt 102 as consistent as possible with the speed of the second conveyor belt 102.

[0022] The real-time wind speed in the air duct 3 is detected by the anemometer 403, and the voltage of the square fan 401 is driven by PID control together with the speed of the conveyor belt group 1. In order to increase the uniformity after control and overcome the process difference between the wind sources on the two sides, a compound automatic control is adopted, and two anemometers 403 feedback are set separately, and the two fan drive values ​​are calculated together.

[0023] Two different sets of square fans 401 are started, the output values ​​of the two sets of anemometers 403 are observed, and the component matrix A=[[a11,a12],[a21,a22]] from each square fan 401 to the two sides of the air duct 3 is calculated. Under on-site automatic control, the two anemometers 403 provide feedback of the real-time wind speed, and PID calculations are performed separately based on the conveyor belt linear speed. After multiplication by the inverse matrix of A, the two fan drive PWM values ​​are output.

[0024] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A high-speed air-conducting belt scale, comprising a conveyor belt assembly (1) and an air-conducting duct (3), characterized in that: The conveyor belt group (1) is composed of a first conveyor belt (101), a second conveyor belt (102) and a third conveyor belt (103), wherein the first conveyor belt (101), the second conveyor belt (102) and the third conveyor belt (103) are arranged side by side, the second conveyor belt (102) is located in the inner cavity of the air duct (3), and objects located on the second conveyor belt (102) are weighed by a weighing unit, and a fan group (4) is provided at a port of the air duct (3) away from the conveying direction of the second conveyor belt (102) for generating wind force so that the wind speed at each point on the second conveyor belt (102) is consistent with the speed of the second conveyor belt (102); The air outlet end of the air guide duct (3) is equipped with an anemometer (403) for observing the wind speed of the second conveyor belt (102) so as to automatically control the air outlet volume of the fan group (4) through feedback.

2. The air-guided high-speed belt scale according to claim 1, characterized in that: The fan group (4) is composed of two fan groups, which are respectively arranged on both sides of the air guide pipe (3), and the two fan groups (4) have inward bevels.

3. The air-guided high-speed belt scale according to claim 2, characterized in that: The fan group (4) is composed of three stacked square fans (401), and a rectifier block (402) is provided at the front end of each square fan (401). The rectifier block (402) is composed of vertical lattice tubes with the same width and height as the fan group (4) and is in a lattice shape. The front end of the rectifier block (402) is in an oblique angle cut.

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