An arc chute scale and its weighing method

Abstract

An embodiment of the present invention discloses an arc chute scale, which includes an inclined guiding chute. There is a feed hopper above the guiding chute. The end of the guiding chute is provided with an arc weighing chute. There is a gap between the guiding chute and the arc weighing chute. A first force sensor and a second force sensor are respectively arranged at the bottom of the smooth weighing chute. The arc weighing chute is installed at the force measuring end of the first force sensor. The fixed end of the first force sensor is installed at the force measuring end of the second force sensor. The fixed end of the second force sensor is installed on the frame. Both the first force sensor and the second force sensor are electrically connected to a weighing instrument; it also includes a weighing method. With a simple, reliable and stable arc chute structure, the present invention can automatically measure and display the material flow and cumulative weight through programming calculation, and is particularly suitable for the flow measurement and continuous cumulative weighing of various bulk materials and liquids.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of flow measurement and continuous cumulative automatic weighing of bulk materials in transportation and liquids in flow, and particularly to an arc chute scale and its weighing method. Background Art

[0002] When measuring bulk materials conveyed in a conveying chute in the prior art, a chute scale composed of a weighing chute and an impact chute is commonly used for measurement. Due to the limited distance between the weighing chute and the impact chute of this chute scale, it is easy to be stuck and damaged when encountering large pieces of materials. There is also an arc-shaped solid flowmeter, the structure of which is that only a force sensor in one direction is installed on the arc weighing. It is required that the speed of the material entering the weighing arc chute must be constant. However, the speed of the material is greatly affected by factors such as flow rate, particle size, friction coefficient, viscosity, density, and inlet height, and it is impossible to ensure constancy. Therefore, the error is very large in actual use. Summary of the Invention

[0003] Therefore, the embodiments of the present invention provide an arc chute scale and its weighing method to solve the problem that the weighing in the prior art is easily affected by the properties of materials.

[0004] To achieve the above object, the following technical solutions are provided in the embodiments of the present invention:

[0005] An arc chute scale includes an inclined guiding chute, an inlet hopper is arranged above the guiding chute, and the guiding chute is fixed on a base surface through a frame;

[0006] The end of the guiding chute is provided with an arc weighing chute, a gap is arranged between the guiding chute and the arc weighing chute, a first force sensor and a second force sensor are respectively arranged at the bottom of the smooth weighing chute, the arc weighing chute is installed at the force measuring end of the first force sensor, the fixed end of the first force sensor is installed at the force measuring end of the second force sensor, the fixed end of the second force sensor is installed on the frame, the force measuring direction of the first force sensor is obliquely intersecting with the force measuring direction of the second force sensor, and both the first force sensor and the second force sensor are electrically connected to a weighing instrument.

[0007] As a preferred solution of the present invention, the force measuring direction of the first force sensor is consistent with the normal direction of the arc midpoint of the arc weighing chute, and the force measuring direction of the second force sensor is consistent with the tangent direction of the arc midpoint of the arc weighing chute.

[0008] As a preferred solution of the present invention, all or part of the guiding chute, the arc weighing chute, the first force sensor, the second force sensor and the frame are enclosed in a box body, and an inlet and an outlet are respectively arranged at the top and the bottom of the box body.

[0009] As a preferred embodiment of the present invention, the first force measuring sensor, the second force measuring sensor and the weighing instrument all adopt explosion-proof structures.

[0010] As a preferred embodiment of the present invention, the weighing instrument is an independent device or a combined device composed of several modules. The combined device is respectively composed of a signal amplification module, an analog-to-digital conversion module, a data operation module, a data storage module, a data display module, a data printing module and a data transmission module.

[0011] As a preferred embodiment of the present invention, it jointly constitutes a flow rate regulating system with the feeding device and the control device or jointly constitutes a quantitative control system with the feeding device and the control device.

[0012] In addition, the present invention also provides a weighing method for an arc chute scale, which includes the following steps:

[0013] Step 100: Measure the calculation parameters of the guiding chute and the arc weighing chute;

[0014] Step 200: Sequentially obtain the forces exerted on the arc weighing chute by the material passing through the arc weighing chute through the corresponding first force measuring sensor and second force measuring sensor;

[0015] Step 300: Calculate the flow rate of the material on the arc weighing chute, and then obtain the cumulative weight of the material through programmed integration.

[0016] As a preferred embodiment of the present invention, the calculation parameters in step 100 are specifically: measure and obtain the arc radius R, arc angle β of the arc weighing chute, and the angle α between the bottom surface of the guiding chute and the horizontal plane;

[0017] Wherein: 20° < α ≤ 85°, 5° < β ≤ 60°, 50mm < R ≤ 30m, 5mm < the width of the smooth weighing chute ≤ 500m.

[0018] As a preferred embodiment of the present invention, in step 300, the specific steps of flow rate calculation are as follows:

[0019] Step 301: Obtain the force F2 exerted on the first weighing sensor by the material and its sliding and the force F1 exerted on the second weighing sensor by the material and its sliding;

[0020] Step 302: Calculate the material velocity V according to the following formula:

[0021]

[0022] In the formula, θ is the angle between F1 and the vertical direction, and γ is the angle between F2 and the vertical direction;

[0023] Step 303: Calculate the material flow rate Q according to the following formula:

[0024]

[0025] where g is the acceleration due to gravity;

[0026] Integrate the flow rate Q to obtain the cumulative weight W of the material flowing through the chute:

[0027] W = ∫Q dt.

[0028] As a preferred embodiment of the present invention, in step 300, the specific steps of flow rate calculation are as follows:

[0029] Step 301: Obtain the force F2 exerted on the first weighing sensor by the material and its sliding, and the force F1 exerted on the second weighing sensor by the material and its sliding;

[0030] Step 302: Calculate the material velocity V according to the following formula:

[0031]

[0032] Step 303: Calculate the material flow rate Q according to the following formula:

[0033]

[0034] where g is the acceleration due to gravity;

[0035] Integrate the flow rate Q to obtain the cumulative weight W of the material flowing through the chute:

[0036] W = ∫Q dt.

[0037] The embodiments of the present invention have the following advantages:

[0038] The present invention can adapt to materials with different particle sizes and speeds on the premise of continuous non-blocking weighing, improve the measurement accuracy, make the applicability of the materials strong, and can automatically measure and display the material flow rate in cooperation with programming calculation, which is especially suitable for the flow measurement and continuous cumulative weighing of various bulk materials and liquids. Description of the Drawings

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, other implementation drawings can be obtained according to the provided drawings without creative efforts.

[0040] The structures, proportions, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of the present invention. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention.

[0041] Figure 1 is a schematic diagram of the overall structure in the embodiment of the present invention;

[0042] Figure 2 is a schematic diagram of mechanical analysis in the embodiment of the present invention;

[0043] Figure 3 is another schematic diagram of mechanical analysis in the embodiment of the present invention;

[0044] Figure 4 is a schematic diagram of the structure of the box body in the embodiment of the present invention;

[0045] Figure 5 is a schematic diagram of the process in the embodiment of the present invention;

[0046] In the figure: 1 - guiding chute; 2 - arc weighing chute; 3 - first force sensor; 4 - second force sensor; 5 - weighing instrument; 6 - frame; 7 - material; 8 - box body. Specific Embodiments

[0047] The following specific embodiments illustrate the implementation manners of the present invention. Those familiar with this technology can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0048] As Figure 1 and Figure 4 shown, the present invention provides an arc chute scale, including an inclined guiding chute 1, above which there is a feed hopper, and the guiding chute 1 is fixed on the base surface through a frame 6.

[0049] The end of the guiding chute 1 is provided with an arc weighing chute 2. There is a gap between the guiding chute 1 and the arc weighing chute 2. At the bottom of the smooth weighing chute 2, a first force sensor 3 and a second force sensor 4 are respectively provided. The arc weighing chute 2 is installed at the force measuring end of the first force sensor 3. The fixed end of the first force sensor 3 is installed at the force measuring end of the second force sensor 4. The fixed end of the second force sensor 4 is installed on the frame 6. The force measuring directions of the first force sensor 3 and the second force sensor 4 are obliquely intersecting. Both the first force sensor 3 and the second force sensor 4 are electrically connected to a weighing instrument 5.

[0050] During operation, the material or liquid 7 enters the guiding chute 1 from the feed port. The material flows through the arc weighing chute 2 by the action of weight and inertia force. When the material or liquid flows through the arc weighing chute 2, it will generate a force on the first force sensor 3 and the second force sensor 4.

[0051] The weighing instrument 5 with a single-chip microcomputer calculates the speed, flow rate and cumulative weight of the material according to the force value signals of the first force sensor 3 and the second force sensor 4 by the following steps and methods.

[0052] In the above, all or part of the guiding chute 1, the arc weighing chute 2, the first force sensor 3, the second force sensor 4 and the frame 6 are enclosed in a box 8, and a feed port and a discharge port are respectively provided at the top and bottom of the box 8. Among them, the first force sensor 3, the second force sensor 4 and the weighing instrument 5 all adopt explosion-proof structures.

[0053] In addition, the weighing instrument 5 is an independent device or a combined device composed of several modules. The combined device is respectively composed of a signal amplification module, an analog-to-digital conversion module, a data operation module, a data storage module, a data display module, a data printing module and a data transmission module.

[0054] According to Newton's second law F = m a and the centrifugal force formula F = m V 2 / R, under the above structure, the speed V of the material flowing through the arc weighing chute can be deduced, and then the flow rate of the material can be deduced according to the relationship between the flow rate and the flow velocity Q = V m / L. As Figure 5 shown, the derivation results and calculation steps are as follows:

[0055] Step 100: Measure the calculation parameters of the guiding chute and the arc weighing chute;

[0056] Step 200: Sequentially obtain the forces received by the arc weighing chute when the material passes through the arc weighing chute through the corresponding first force sensor and second force sensor;

[0057] Step 300: Calculate the flow velocity V on the arc weighing chute, calculate the flow rate Q based on the flow velocity, and then obtain the total mass W of the material through programmed integration.

[0058] Among them, the calculation parameters in Step 100 are specifically: measure the arc radius R, arc angle β of the arc weighing chute, and the angle α between the bottom surface of the guiding chute and the horizontal plane;

[0059] Among them: 20° < α ≤ 85°, 5° < β ≤ 60°, 50mm < R ≤ 30m, 5mm < the width of the smooth weighing chute ≤ 500m.

[0060] As Figure 2 shown, as one of the measurement methods, it includes the following specific steps:

[0061] Step 301: Obtain the force F2 exerted on the first weighing sensor by the material and its sliding and the force F1 exerted on the second weighing sensor by the material and its sliding;

[0062] Step 302: Calculate the material velocity V according to the following formula:

[0063]

[0064] In the formula, θ is the angle between F1 and the vertical direction, and γ is the angle between F2 and the vertical direction;

[0065] Step 303: Calculate the material flow rate Q according to the following formula:

[0066]

[0067] In the formula, g is the acceleration due to gravity;

[0068] Integrate the flow rate Q to obtain the cumulative weight W of the material flowing through the chute:

[0069] W = ∫Q dt.

[0070] As another measurement method, the force measuring direction of the first force measuring sensor 3 is consistent with the normal direction of the arc midpoint of the arc weighing chute 2, and the force measuring direction of the second force measuring sensor 4 is consistent with the tangent direction of the arc midpoint of the arc weighing chute 2. The force diagram and related symbols are as Figure 3 shown. The calculation of the flow rate includes the following specific steps:

[0071] Step 301: Obtain the force F2 exerted on the first weighing sensor by the material and its sliding and the force F1 exerted on the second weighing sensor by the material and its sliding;

[0072] Step 302: Calculate the material velocity V according to the following formula:

[0073]

[0074] Step 303: Calculate the material flow rate Q according to the following formula:

[0075]

[0076] where g is the acceleration due to gravity;

[0077] Integrate the flow rate Q to obtain the cumulative weight W of the material flowing through the chute:

[0078] W = ∫Q dt.

[0079] In summary, the present invention can adapt to materials with different particle sizes and speeds on the premise of continuous non-jamming weighing, improve the measurement accuracy, make the applicability of the materials strong, and can automatically measure and display the material flow rate in cooperation with programming calculations. It is especially suitable for the flow measurement and continuous cumulative weighing of various bulk materials and liquids.

[0080] Although the present invention has been described in detail with general descriptions and specific embodiments above, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. An arc chute scale, characterized in that, It includes an inclined guiding chute (1), above which there is a feed hopper, and the guiding chute (1) is fixed on the base surface through a frame (6); At the end of the guiding chute (1), there is an arc weighing chute (2). There is a gap between the guiding chute (1) and the arc weighing chute (2). At the bottom of the arc weighing chute (2), there are a first force sensor (3) and a second force sensor (4) respectively. The arc weighing chute (2) is installed at the force measuring end of the first force sensor (3). The fixed end of the first force sensor (3) is installed at the force measuring end of the second force sensor (4). The fixed end of the second force sensor (4) is installed on the frame (6). The force measuring direction of the first force sensor (3) and the force measuring direction of the second force sensor (4) are obliquely intersecting. Both the first force sensor (3) and the second force sensor (4) are electrically connected to a weighing instrument (5); It also includes a weighing method for the arc chute scale, which includes the following steps: Step 100: Measure the calculation parameters of the guiding chute and the arc weighing chute; Step 200: Obtain the forces exerted on the arc weighing chute by the material passing through the arc weighing chute through the corresponding first force sensor and second force sensor in sequence; Step 300: Calculate the flow rate of the material on the arc weighing chute, and then obtain the cumulative weight of the material through programming integration; In step 300, the specific steps of flow rate calculation are as follows: Step 301: Obtain the force F2 exerted on the first weighing sensor by the material and its sliding and the force F1 exerted on the second weighing sensor by the material and its sliding; Step 302: Calculate the material velocity V according to the following formula: In the formula, θ is the angle between F1 and the vertical direction, and γ is the angle between F2 and the vertical direction; Step 303: Calculate the material flow rate Q according to the following formula: In the formula, g is the acceleration due to gravity; Integrate the flow rate Q to obtain the cumulative weight W of the material flowing through the chute: W = ∫Qdt.

2. The arc chute scale according to claim 1, wherein, The force measuring direction of the first force sensor (3) is consistent with the normal direction of the arc midpoint of the arc weighing chute (2), and the force measuring direction of the second force sensor (4) is consistent with the tangent direction of the arc midpoint of the arc weighing chute (2).

3. The arc chute scale according to claim 1, wherein, All or part of the guiding chute (1), arc weighing chute (2), first force sensor (3), second force sensor (4) and frame (6) are enclosed in a box (8), and there are a feed inlet and a discharge outlet at the top and bottom of the box (8) respectively.

4. The arc chute scale according to claim 1, wherein The first force sensor (3), second force sensor (4) and weighing instrument (5) all adopt explosion-proof structures.

5. The arc chute scale according to claim 1, wherein The weighing instrument (5) is an independent device or a combined device composed of several modules. The combined device is respectively composed of a signal amplification module, an analog-to-digital conversion module, a data operation module, a data storage module, a data display module, a data printing module and a data transmission module.

6. The arc chute scale according to claim 1, wherein, It constitutes a flow rate adjustment system together with a feeding device and a control device or constitutes a quantitative control system together with a feeding device and a control device.

7. The arc chute scale according to claim 1, characterized in that, The calculation parameters in step 100 are specifically: the arc radius R, arc angle β of the arc weighing chute are measured, and the angle α between the bottom surface of the guiding chute and the horizontal plane is measured; Among them: 20° < α ≤ 85°, 5° < β ≤ 60°, 50 mm < R ≤ 30 m, 5 mm < the width of the arc weighing chute ≤ 500 m.

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