A sliding arc chute scale and weighing method thereof

Abstract

The embodiment of the present invention discloses an arc chute scale, comprising a guide chute, a feed hopper is arranged above the guide chute, an inclined weighing chute and an arc weighing chute are arranged in sequence at the end of the guide chute, a material passing gap is left between the guide chute and the inclined weighing chute and between the inclined weighing chute and the arc weighing chute, a first force sensor and a second force sensor are respectively installed at the bottom of the inclined weighing chute and the arc weighing chute through a support plate, the first force sensor and the second force sensor are electrically connected to a weighing instrument; and a weighing method is also included; the present invention uses a simple, reliable and stable combined structure of an inclined chute and an arc chute, which can automatically measure and display material flow and cumulative weight in conjunction with programming calculation, and is particularly suitable for 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 being transported and liquids being flown, and in particular to an arc chute scale and a weighing method thereof. Background Art

[0002] In the prior art, when measuring bulk materials transported in a conveyor trough, a chute scale consisting of a weighing chute and an impact chute is often used for measurement. This chute scale is easily stuck and damaged when encountering large pieces of material due to the limited distance between the weighing chute and the impact chute. There is also an arc-type solid flowmeter, which has a structure in which only one direction of the force sensor is installed on the arc weighing, and the speed of the material entering the weighing arc trough must be constant. However, the speed of the material is greatly affected by the flow rate, particle size, friction coefficient, viscosity, density, inlet height, etc., and it is impossible to ensure that it is constant, so the error is very large in actual use. Therefore, in actual measurement, weighing is easily affected by the properties of the material, etc. Summary of the invention

[0003] To this end, an embodiment of the present invention provides an arc chute scale and a weighing method thereof to solve the problem in the prior art that weighing is easily affected by material properties.

[0004] In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:

[0005] A sliding arc chute scale, comprising an inclined guide chute, a feed hopper is arranged above the guide chute, and the guide chute is fixed on a base surface through a frame;

[0006] An inclined weighing chute and an arc weighing chute are sequentially arranged at the end of the guide chute, and a material passing gap is arranged between the guide chute and the inclined weighing chute and between the inclined weighing chute and the arc weighing chute. A first force sensor and a second force sensor are respectively installed at the bottom of the inclined weighing chute and the arc weighing chute through a support plate, the inclined weighing chute is installed on the force measuring end of the first force sensor, and the arc weighing chute is installed on the force measuring end of the second force sensor, and the first force sensor and the second force sensor are both electrically connected to the weighing instrument.

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

[0008] As a preferred solution of the present invention, the guide chute, the inclined weighing chute, the arc weighing chute, the first force sensor, the second force sensor and the frame are all or partially enclosed in a box, and the box is provided with a feed port and a discharge port.

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

[0010] As a preferred solution of the present invention, the weighing instrument 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 calculation module, a data storage module, a data display module, a data printing module and a data transmission module.

[0011] As a preferred solution of the present invention, a flow regulating system is formed together with a feeding device and a control device, or a quantitative control system is formed together with a feeding device and a control device.

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

[0013] Step 100, measuring the calculation parameters of the guide chute, the inclined weighing chute and the arc weighing chute;

[0014] Step 200, using the corresponding first force sensor and the second force sensor to sequentially obtain the forces exerted on the inclined weighing chute and the arc weighing chute when the material passes through the inclined weighing chute and the arc weighing chute;

[0015] Step 300, calculate the flow rate of the material on the inclined weighing chute and the arc weighing chute, and then obtain the cumulative weight of the material through programming integration.

[0016] As a preferred solution of the present invention, the calculation parameters in step 100 are specifically: measuring and obtaining the length L of the inclined weighing chute, the arc radius R of the arc weighing chute, the arc angle β, and the angle α between the bottom surface of the guide chute and the horizontal plane;

[0017] Among them: 20°<α≤85°, 5°<β≤60°, 50mm<R≤30m, 10mm<L≤3m, 5mm<the width of the smooth weighing chute≤500m.

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

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

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

[0021]

[0022] Where γ is the angle between F1 and the vertical direction, and θ 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] Integrating the flow rate Q gives the cumulative weight W of the material flowing through the chute:

[0027] W = ∫Qdt.

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

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

[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] Integrating the flow rate Q gives the cumulative weight W of the material flowing through the chute:

[0036] W = ∫Qdt.

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

[0038] The present invention can adapt to materials of different particle sizes and speeds under the premise of continuous weighing without material jamming, improve the measurement accuracy, make the material highly applicable, and can automatically measure and display the material flow in conjunction with programming calculation, and is particularly suitable for flow measurement and continuous cumulative weighing of various bulk materials and liquids. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0040] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

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

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

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

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

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

[0046] In the figure: 1-guide chute; 2-inclined weighing chute; 3-arc weighing chute; 4-first force sensor; 5-second force sensor; 6-weighing instrument; 7-frame; 8-material; 9-box. DETAILED DESCRIPTION

[0047] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0048] like Figure 1 and Figure 4 As shown, the present invention provides an arc chute scale, comprising an inclined guide chute 1, a feed hopper is arranged above the guide chute 1, and the guide chute 1 is fixed on a base surface through a frame 7.

[0049] The end of the guide chute 1 is provided with an inclined weighing chute 2, and the end of the inclined weighing chute 2 is provided with an arc weighing chute 3. There is a material passing gap between the guide chute 1 and the inclined weighing chute 2 and between the inclined weighing chute 2 and the arc weighing chute 3. The first force sensor 4 and the second force sensor 5 are respectively installed at the bottom of the inclined weighing chute 2 and the arc weighing chute 3 through a support plate. In addition, the inclined weighing chute 2 can also be installed on the force measuring end of the first force sensor 4, and the fixed end of the first force sensor 4 is installed on the frame 7, and the arc weighing chute 3 is installed on the force measuring end of the second force sensor 5, and the fixed end of the second force sensor 5 is installed on the machine 7.

[0050] The first force sensor 4 and the second force sensor 5 are both electrically connected to a weighing instrument 6 .

[0051] During operation, the material or liquid 8 enters the guide chute 1 from the feed port, and the material flows through the inclined weighing chute 2 and the arc weighing chute 3 by gravity and inertia. It should be noted that the role of the material transfer gap between adjacent chutes is to ensure that the forces between adjacent chutes are independent and do not affect the measurement accuracy and results between adjacent chutes. However, the setting of the material transfer gap does not affect the passage of the material. In particular, when the material is liquid, the upper chute should be built above the lower chute, so that the setting of the chute will not affect the passage of the material, and at the same time ensure that the forces between the chutes are not affected.

[0052] When the material or liquid flows through the inclined weighing chute 2, a force is generated on the first force sensor 4. When the material or liquid flows through the arc weighing chute 3, a force is generated on the second force sensor 5.

[0053] The weighing meter 6 with a single chip microcomputer calculates the speed, flow rate and accumulated weight of the material according to the following steps and methods based on the force value signals of the first force sensor 4 and the second force sensor 5.

[0054] In the above, the guide chute 1, the inclined weighing chute 2, the arc weighing chute 3, the first force sensor 4, the second force sensor 5 and the frame 7 are all or partially enclosed in the box 9, and the feed port and the discharge port are respectively provided at the top and the bottom of the box 9. Among them, the first force sensor 4, the second force sensor 5 and the weighing meter 6 all adopt explosion-proof structures.

[0055] In addition, the weighing meter 6 is an independent device or a combination device composed of several modules, and the combination device is respectively composed of a signal amplification module, an analog-to-digital conversion module, a data calculation module, a data storage module, a data display module, a data printing module and a data transmission module.

[0056] According to Newton's second law F = ma and the centrifugal force formula F = mV2 / R, under the above structure, the speed V of the material flowing through the arc weighing chute can be derived, and then the flow rate of the material can be derived according to the relationship between flow rate and flow velocity Q = Vm / L. Figure 5 As shown, the derivation results and calculation steps are:

[0057] Step 100, measuring the calculation parameters of the guide chute, the inclined weighing chute and the arc weighing chute;

[0058] Step 200, using the corresponding first force sensor and the second force sensor to obtain the force applied to the material when it passes through the inclined weighing chute and the arc weighing chute;

[0059] Step 300, calculate the flow velocity V on the arc weighing chute, and calculate the flow rate Q based on the flow velocity, and then obtain the total mass W of the material through programming integration.

[0060] The calculation parameters in step 100 are specifically: measuring and obtaining the length L of the inclined weighing chute, the arc radius R of the arc weighing chute, the arc angle β, and the angle α between the bottom surface of the guide chute and the horizontal plane;

[0061] Among them: 20°<α≤85°, 5°<β≤60°, 50mm<R≤30m, 10mm<L≤3m, 5mm<the width of the smooth weighing chute≤500m.

[0062] like Figure 2 As shown, as one of the measurement methods, it includes the following specific steps:

[0063] Step 301, obtaining the force F1 exerted on it by the material and its sliding by the first weighing sensor and the force F2 exerted on it by the material and its sliding by the second weighing sensor;

[0064] Step 302: Calculate the material velocity V according to the following formula:

[0065]

[0066] Where γ is the angle between F1 and the vertical direction, and θ is the angle between F2 and the vertical direction;

[0067] Step 303: Calculate the material flow rate Q according to the following formula:

[0068]

[0069] Where g is the acceleration due to gravity;

[0070] Integrating the flow rate Q gives the cumulative weight W of the material flowing through the chute:

[0071] W = ∫Qdt.

[0072] As another measurement method, the force measuring direction of the first force sensor 4 is perpendicular to the bottom surface of the inclined weighing chute 2; the force measuring direction of the second force sensor 5 is consistent with the normal direction of the arc midpoint of the arc weighing chute 3. Figure 3 The calculation of flow rate includes the following specific steps:

[0073] Step 301, obtaining the force F1 exerted on it by the material and its sliding by the first weighing sensor and the force F2 exerted on it by the material and its sliding by the second weighing sensor;

[0074] Step 302: Calculate the material velocity V according to the following formula:

[0075]

[0076] Step 303: Calculate the material flow rate Q according to the following formula:

[0077]

[0078] Where g is the acceleration due to gravity;

[0079] Integrating the flow rate Q gives the cumulative weight W of the material flowing through the chute:

[0080] W = ∫Qdt.

[0081] In summary, the present invention can adapt to materials of different particle sizes and speeds under the premise of continuous weighing without jamming, improve the measurement accuracy, make the material highly applicable, and can automatically measure and display the material flow in conjunction with programming calculation. It is particularly suitable for flow measurement and continuous cumulative weighing of various bulk materials and liquids.

[0082] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A sliding arc chute scale, characterized in that: It comprises an inclined guide chute (1), a feed hopper is provided above the guide chute (1), and the guide chute (1) is fixed on a base surface through a frame (7); The end of the guide chute (1) is provided with an inclined weighing chute (2) and an arc weighing chute (3) in sequence, and a material passing gap is provided between the guide chute (1) and the inclined weighing chute (2) and between the inclined weighing chute (2) and the arc weighing chute (3). The bottom of the inclined weighing chute (2) and the arc weighing chute (3) are respectively installed with a first force sensor (4) and a second force sensor (5) through a supporting plate, the inclined weighing chute (2) is installed on the force measuring end of the first force sensor (4), and the arc weighing chute (3) is installed on the force measuring end of the second force sensor (5), and the first force sensor (4) and the second force sensor (5) are both electrically connected to a weighing instrument (6); The weighing method of the sliding arc chute scale includes the following steps: Step 100, measuring the calculation parameters of the guide chute, the inclined weighing chute and the arc weighing chute; Step 200, using the corresponding first force sensor and the second force sensor to sequentially obtain the forces exerted on the inclined weighing chute and the arc weighing chute when the material passes through the inclined weighing chute and the arc weighing chute; Step 300, calculating the flow of materials on the inclined weighing chute and the arc weighing chute, and then obtaining the cumulative weight of the materials through programming integration; The specific steps of flow calculation are: Step 301, obtaining the force F1 exerted on it by the material and its sliding by the first weighing sensor and the force F2 exerted on it by the material and its sliding by the second weighing sensor; Step 302: Calculate the material velocity V according to the following formula: Where γ is the angle between F1 and the vertical direction, and θ is the angle between F2 and the vertical direction; Step 303: Calculate the material flow rate Q according to the following formula: Where g is the acceleration due to gravity; Integrating the flow rate Q gives the cumulative weight W of the material flowing through the chute: W = ∫Qdt.

2. The sliding arc chute scale according to claim 1, characterized in that: The force measuring direction of the first force sensor (4) is perpendicular to the bottom surface of the inclined weighing chute (2), and the force measuring direction of the second force sensor (5) is consistent with the normal direction of the midpoint of the circular arc weighing chute (3).

3. The sliding arc chute scale according to claim 1, characterized in that: The guide chute (1), the inclined weighing chute (2), the arc weighing chute (3), the first force sensor (4), the second force sensor (5) and the frame (7) are all or partially enclosed in a box (9), and the box (9) is provided with a feed inlet and a discharge outlet.

4. The sliding arc chute scale according to claim 1, characterized in that: The first force sensor (4), the second force sensor (5) and the weighing instrument (6) all adopt explosion-proof structures.

5. The sliding arc chute scale according to claim 1, characterized in that: The weighing instrument (6) 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 storage module, a data display module, a data printing module and a data transmission module.

6. The sliding arc chute scale according to claim 1, characterized in that: Together with the feeding device and the control device, it forms a flow regulating system or together with the feeding device and the control device, it forms a quantitative control system.

7. The sliding arc chute scale according to claim 1, characterized in that: The calculation parameters in step 100 are specifically: measuring and obtaining the length L of the inclined weighing chute, the arc radius R of the arc weighing chute, the arc angle β, and the angle α between the bottom surface of the guide chute and the horizontal plane; Among them: 20°<α≤85°, 5°<β≤60°, 50mm<R≤30m, 10mm<L≤3m, 5mm<the width of the smooth weighing chute≤500m.

8. The sliding arc chute scale according to claim 1, characterized in that: In step 300, the specific steps of flow calculation are: Step 301, obtaining the force F1 exerted on it by the material and its sliding by the first weighing sensor and the force F2 exerted on it by the material and its sliding by the second weighing sensor; Step 302: Calculate the material velocity V according to the following formula: Step 303: Calculate the material flow rate Q according to the following formula: Where g is the acceleration due to gravity; Integrating the flow rate Q gives the cumulative weight W of the material flowing through the chute: W = ∫Qdt.

Images