Arc chute scale and metering method thereof
By designing a specific structure and calculation method for the circular arc chute scale, and combining it with sensors and instruments, the problems of large measurement errors and limited application scenarios were solved, achieving higher accuracy and wider applicability for the measurement of bulk materials and liquids.
Patent Information
- Application Number
- CN202511148407.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-17
- Publication Date
- 2025-11-07
AI Technical Summary
Existing circular arc chute scales have problems such as large measurement errors, limited application scenarios, and even greater errors at low flow rates when measuring bulk materials or liquids. They are also prone to getting stuck by large pieces of material.
An arc-shaped chute scale is designed, including an inclined guide chute, a weighing chute, and an arc-shaped force-measuring chute. The scale uses first and second force sensors in conjunction with a weighing instrument to calculate the speed and flow rate of the material using gravity and centrifugal force. It employs a specific structure and calculation method for measurement and is enclosed within the box to prevent dust and wind.
It improves metering accuracy, expands application scenarios, reduces the risk of large materials getting stuck, and adapts to accurate metering under different flow conditions.
Smart Images
Figure CN120907645A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of mass measurement and mass flow measurement, in particular to a device and a measurement method for measuring bulk materials and liquids in a continuous conveying or flowing process. BACKGROUND
[0002] In the prior art, when measuring bulk materials or liquids conveyed in a conveying trough, a circular-arc chute scale composed of a weighing chute and a circular-arc force-measuring chute is used for measurement. The existing circular-arc chute scale has a large measurement error due to its incorrect calculation method, and it requires the force-measuring direction of the second force sensor to be consistent with the normal direction of the midpoint of the circular arc of the weighing chute, which limits the use scenarios. There is also a chute scale with a notch, which has a large error at a small flow rate and is easily blocked by large pieces of material and fails. SUMMARY
[0003] The present application aims to provide a circular-arc chute scale and a measurement method thereof to solve the problems of large measurement error, limited use scenarios, large error at a small flow rate, and being easily blocked by large pieces of material and failing. The present application specifically provides the following technical solutions: A circular-arc chute scale, comprising an inclined guide chute (2), a storage feeding device (1) is arranged above the guide chute (2), and the guide chute (2) is fixed to a base surface through a rack (9); a weighing chute (3) is arranged at the outlet end of the guide chute (2), and a circular-arc force-measuring chute (4) is arranged at the outlet end of the weighing chute (3); a small gap is left between the guide chute (2) and the weighing chute (3); a small gap is left between the weighing chute (3) and the circular-arc force-measuring chute (4); the weighing chute (3) is installed on the force-measuring end of a first force sensor (5), and the fixed end of the first force sensor (5) is fixedly installed on the rack (9); the circular-arc force-measuring chute (4) is installed on the force-measuring end of a second force sensor (6), and the fixed end of the second force sensor (6) is fixedly installed on the rack (9); the first force sensor (5) and the second force sensor (6) are electrically connected to a weighing instrument (7); the bottom surface of the guide chute (2), the bottom surface of the weighing chute (3), and the circular-arc surface at the inlet of the circular-arc force-measuring chute (4) are on the same plane; the widths of all the chutes are the same; the center lines of the guide chute (2), the weighing chute (3), and the circular-arc force-measuring chute (4) are on the same vertical plane. The structure is as shown in Figure 1
[0004] When working, bulk material or liquid (10) enters the guide chute (2) from the storage feeding device (1) under the action of gravity and inertial force, flows through the weighing chute (3) and the circular arc force measuring chute (4). When the material or liquid (10) flows through the weighing chute (3) and the circular arc force measuring chute (4), the first force measuring sensor (5) and the second force measuring sensor (6) are respectively subjected to the force. The weighing instrument (7) with a computer calculates the average flow velocity V, the flow Q and the cumulative weight W of the material according to the force value signals of the first force measuring sensor (5) and the second force measuring sensor (6) according to the following working principle and method.
[0005] The working principle of the circular arc chute scale is that the velocity V and the flow Q of the material are derived according to the gravity measurement relationship F1=W1·g·cosα and the centrifugal force formula F=mV 2 / 2. In the formula, a, b and c are constant coefficients which are determined when the physical structure size is determined. The specific values are calculated according to the following formula: Wherein: W1 is the weight of the material on the weighing chute; Q is the flow of the material; V is the average velocity of the material in the circular arc; F is the centrifugal force; α is the included angle between the chute bottom surface and the horizontal plane; θ is the central angle of the circular arc force measuring chute (4); R is the radius of the circular arc force measuring chute (4); Φ is the included angle between the force measuring direction of the second force measuring sensor (6) and the vertical downward direction; F1 is the normal pressure of the material on the weighing chute (3), which is also the force measured by the first force measuring sensor (5); F2 is the component of the force of the material on the circular arc force measuring chute (4) in the Φ direction, which is also the force measured by the second force measuring sensor (6); g is the acceleration of gravity.
[0006] The mechanical analysis schematic view is shown in Figure 2 .
[0007] The cumulative weight is obtained by integrating the flow: .
[0008] In order to achieve better measurement effect, the measurement method of the circular arc chute scale requires that 3° < a ≤ 85°, 15 mm < L ≤ 2500 mm, and 10° < θ ≤ 60°.
[0009] The implementation method of the circular arc chute scale is to use a weighing instrument (7) with a computer, and the following steps are performed: Step 1: Calculate the constant coefficients a, b, and c and store them in the corresponding variables. The following steps are performed in a certain interval period ΔT: Step 2: Convert the force value signals of the first force sensor (5) and the second force sensor (6) into digital signals, remove the zero point, and store them in the corresponding variables F1 and F2. Step 3: Obtain the current speed V[i] according to the speed calculation formula. Step 4: Obtain the current flow rate Q[i] according to the flow rate calculation formula, and display the current flow rate Q[i] if necessary. Step 5: Calculate the weight of the material flowing in this interval time according to the following formula: Step 6: Add the weight of this time to the previous cumulative weight, and display the cumulative weight if necessary. Step 7: Determine whether the measurement process is complete. If the measurement process is not complete, return to step 2 and continue to loop. If the measurement work has been completed, end the flow. The flow chart is shown in Figure 4 .
[0010] As a preferred scheme of the present application, a closed box (11) is further included, which encloses all or part of the guide chute (2), the weighing chute (3), the circular arc force measuring chute (4), and the rack (9) in the box (11), and plays the role of dust prevention, wind prevention, and theft prevention. The box (11) is provided with a feeding port and a discharging port. Figure 3 .
[0011] As a preferred scheme of the present application, the first force sensor (5), the second force sensor (6), and the weighing instrument (7) adopt an explosion-proof structure to adapt to use in an explosive gas and explosive dust environment.
[0012] As a preferred scheme of the present application, the weighing instrument (7) is an independent device or a combined device composed of several modules, and the combined device is respectively composed of a signal amplification module, an analog-to-digital conversion module, a data operation module, a data saving module, a data display module, a data printing module, and a data transmission module.
[0013] As a preferred scheme of the present application, the present application forms a flow regulating system together with the feeding device and the control device or forms a quantitative control system together with the feeding device and the control device.
[0014] As a preferred scheme of the present application, the material of the chute is selected according to the property of the measured material, and the material is wear-resistant, anti-sticking and smooth. BRIEF DESCRIPTION OF DRAWINGS Figure 1 It is a schematic diagram of the overall structure in the embodiment of the present application. Wherein: 1 - storage feeding device; 2 - guide chute; 3 - weighing chute; 4 - circular arc force measuring chute; 5 - first force measuring sensor; 6 - second force measuring sensor; 7 - weighing instrument; 8 - cable; 9 - rack; 10 - material; Figure 2 It is a schematic diagram of the mechanical analysis in the embodiment of the present application. Wherein: F1 is the normal pressure of the material on the weighing chute, which is also the force measured by the first force measuring sensor; F2 is the component of the force of the material on the circular arc force measuring chute in the direction of φ, which is also the force measured by the second force measuring sensor; α is the inclination angle of the chute, L is the length of the weighing chute, θ is the central angle of the circular arc force measuring chute, R is the radius of the circular arc force measuring chute; φ is the angle between the force measuring direction of the second force measuring sensor (6) and the vertical downward direction; g is the acceleration of gravity; Figure 3 It is a schematic diagram of the structure of the box in the embodiment of the present application. Wherein: 1 - storage feeding device; 2 - guide chute; 3 - weighing chute; 4 - circular arc force measuring chute; 5 - first force measuring sensor; 6 - second force measuring sensor; 7 - weighing instrument; 8 - cable; 9 - rack; 10 - material; 11 - box; Figure 4 It is a schematic diagram of the process in the embodiment of the present application.
Claims
1. A circular arc chute scale characterized by, The application relates to a kind of circular arc chute scales, which comprises a slanted guide chute (2) with a storage feeding device (1) above the guide chute (2), and the guide chute (2) is fixed on the base surface by a frame (9). The lower end of the guide chute (2) is provided with a weight measuring chute (3), and a circular arc force measuring chute (4) is arranged in front of the outlet of the weight measuring chute (3). A small gap is left between the guide chute (2) and the weight measuring chute (3), and a small gap is left between the weight measuring chute (3) and the circular arc force measuring chute (4). The weight measuring chute (3) is installed on the force measuring end of a first force sensor (5), and the fixed end of the first force sensor (5) is fixed on the frame (9). The circular arc force measuring chute (4) is installed on the force measuring end of a second force sensor (6), and the fixed end of the second force sensor (6) is fixed on the frame (9). The first force sensor (5) and the second force sensor (6) are electrically connected to a weighing instrument (7). The bottom surface of the guide chute (2), the bottom surface of the weight measuring chute (3) and the circular arc surface at the inlet of the circular arc force measuring chute (4) are on the same plane. The widths of all the chutes are the same. The center lines of the guide chute (2), the weight measuring chute (3) and the circular arc force measuring chute (4) are on the same vertical plane.
2. A kind of circular arc chute scale's metering method, comprising the following steps: Step A: measuring the calculation parameters of the guide chute (2), the weight measuring chute (3) and the circular arc force measuring chute (4), including the inclination angle α of the chute, the length L of the weight measuring chute (3), the central angle θ of the circular arc force measuring chute (4), the radius R of the circular arc force measuring chute (4), the angle Φ between the force measuring direction of the second force sensor (6) and the vertical downward direction, and the gravity acceleration g; Step B: calculating the constant coefficients a, b and c: b = R ⋅ g s i n 2 α - Φ - s i n 2 α - Φ - 2 θ + 2 R ⋅ θ ⋅ g ⋅ c o s Φ Step C: measuring the measurement value F1 of the first force sensor (5) after removing the zero point and the measurement value F2 of the second force sensor (6) after removing the zero point; Step D: calculating the speed V of the material: Step E: calculating the flow Q of the material: Step F: obtaining the cumulative weight W of the material by integration: 。 3. The method of claim 2, wherein the arcuate chute scale is characterized by, The specific requirements for the calculation parameters in step A are as follows: 3° < α ≤ 85°, 15 mm < L ≤ 2500 mm, 10° < θ ≤ 60°.
4. The implementation method of the metering method of the circular arc chute scale according to claim 2 is to use a weighing instrument (7) with a computer, and the program is carried out according to the following steps: Step 1: calculating the constant coefficients a, b and c and storing them in corresponding variables: b = R ⋅ g s i n 2 α - Φ - s i n 2 α - Φ - 2 θ + 2 R ⋅ θ ⋅ g ⋅ c o s Φ wherein α is the inclination angle of the chute, L is the length of the weight measuring chute (3), θ is the central angle of the circular arc force measuring chute (4), R is the radius of the circular arc force measuring chute (4), Φ is the angle between the force measuring direction of the second force sensor (6) and the vertical downward direction, and g is the gravity acceleration; The following steps are repeated at a certain interval ΔT: Step 2: converting the force value signals of the first force sensor (5) and the second force sensor (6) into digital signals, removing the zero point and storing them in corresponding variables F1 and F2. Step 3: Obtain the current speed V[i] according to the speed V calculation formula in claim 2; Step 4: Obtain the current flow Q[i] according to the flow Q calculation formula in claim 2, and display the current flow Q[i] if necessary; Step 5: Calculate the weight of the material flowing in this interval according to the following formula: w i = Δ T ⋅ Q i Step 6: Add the weight of this time to the previous cumulative weight according to the following formula, and display the cumulative weight if necessary: W = W + w i Step 7: Determine whether the metering process is complete, if the metering work is not complete, return to step 2 and continue to loop; if the metering work has been completed, end the process.
5. The circular arc chute scale according to claim 1, wherein The guiding chute (2), the weighing chute (3), the circular arc force measuring chute (4) and the frame (9) are all or partially enclosed in the box (11), which plays the role of dust prevention, wind prevention and theft prevention; the box (11) is provided with a feeding port and a discharging port.
6. The circular arc chute scale according to claim 1, wherein The first force sensor (5), the second force sensor (6) and the weighing instrument (7) adopt an explosion-proof structure to adapt to the use in an explosive gas and explosive dust environment.
7. The circular arc chute scale according to claim 1, wherein The weighing instrument (7) is an independent device or a combined device composed of several modules, and the combined device is respectively composed of a signal amplification module, an analog-to-digital conversion module, a data operation module, a data saving module, a data display module, a data printing module and a data transmission module.
8. The circular arc chute scale according to claim 1, wherein The feeding device and the control device jointly constitute a flow regulating system or a quantitative control system.
9. The circular arc chute scale according to claim 1, wherein The chute material is selected according to the properties of the measured material, and good materials with wear resistance, anti-adhesion and smoothness are selected.