A method for selecting a screw conveyor

Abstract

The application discloses a kind of spiral conveyer selection method, including step obtaining demand information;According to the maximum error formula, the diameter of spiral conveyer and the relationship of the half cone angle of spiral are calculated;The above relationship is brought into the conveying capacity formula of spiral conveyer, and the rotational speed range of spiral conveyer is solved;According to the rotational speed range of spiral conveyer and the diameter relationship of spiral conveyer, the optimal rotational speed and diameter are found in database;On the basis of conventional conveying capacity calculation, the two important parameters of error and cost are creatively introduced, wherein the cost is determined by the diameter and rotation of spiral conveyer. Through this improvement, the application can obtain the optimal design scheme which is both economical and meets the conveying error requirement by one-time calculation;Not only the design efficiency of spiral conveyer is improved, but also its economy and practicability are optimized.

Description

Technical Field

[0001] The invention relates to the field of material transportation, in particular to a method for selecting a screw conveyor. Background Art

[0002] In the existing technical field, the performance evaluation and design optimization of screw conveyors, a widely used mechanical device for material transportation, primarily focuses on calculating the hourly conveying volume. These calculations are crucial to ensuring that screw conveyors can meet basic material handling requirements. However, a significant limitation of current calculation methods is that they often ignore the inherent connection between screw conveyor design, cost, and conveying errors. This also leads to the fact that screw conveyors are generally not used for metering. If metering is required, additional metering devices are required.

[0003] Specifically, while engineers and designers can determine the conveying capacity of a screw conveyor based on traditional calculation methods, these calculations fail to factor in cost and conveying errors. Cost is a key factor in determining the economic viability of a screw conveyor, while conveying errors are directly related to conveying efficiency and accuracy. This lack of comprehensive consideration of these factors often results in a screw conveyor design that, while theoretically meeting conveying requirements, may face issues such as excessive cost or insufficient conveying accuracy in practice. Summary of the Invention

[0004] Therefore, to address these deficiencies, the present invention provides a method for selecting a screw conveyor. This method, based on conventional conveying capacity calculations, creatively incorporates two key parameters: error and cost. The cost is determined by the screw conveyor's diameter and rotation. This improvement allows a single calculation to yield an optimal design that is both economical and meets conveying error requirements. This not only improves the design efficiency of the screw conveyor, but also optimizes its cost-effectiveness and practicality.

[0005] Specifically, a method for selecting a screw conveyor includes the following steps:

[0006] Obtaining demand information, the demand information including at least a conveying efficiency and a conveying volume error range when conveying materials; wherein the material properties include at least viscosity and density of the material, wherein the viscosity is represented by an adhesion constant; wherein the conveying efficiency is a maximum conveying volume per minute within the error range;

[0007] The relationship between the diameter of the screw conveyor and the semi-cone angle of the screw is calculated based on the maximum error formula;

[0008] Substitute the above relationship into the screw conveyor's conveying capacity formula to find the screw conveyor's speed range;

[0009] According to the relationship between the speed range of the screw conveyor and the diameter of the screw conveyor, the optimal speed and diameter are found in the database.

[0010] The present invention has the following advantages:

[0011] The present invention creatively incorporates two key parameters, error and cost (determined by the diameter and rotation of the screw conveyor), based on conventional conveying capacity calculations. Through this improvement, the present invention can achieve a one-time calculation to obtain an optimal design solution that is both economical and meets conveying error requirements.

[0012] This method improves the accuracy and cost-effectiveness of screw conveyor design. By comprehensively considering multiple key parameters such as speed, the screw's semi-cone angle, material density and viscosity, as well as the user's requirements for error and conveying efficiency, the algorithm can calculate the diameter and semi-cone angle of the screw conveyor blades, ensuring that the conveyor achieves the desired conveying efficiency and error control levels in actual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic flow diagram of the present invention. DETAILED DESCRIPTION

[0014] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0015] In this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "includes," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0016] As mentioned in the background, while engineers and designers can determine the conveying capacity of a screw conveyor based on traditional calculation methods, these calculations fail to factor in cost and conveying errors. Cost is a key factor in determining the economic viability of a screw conveyor, while conveying errors are directly related to conveying efficiency and accuracy. This lack of comprehensive consideration of these factors often results in a screw conveyor design that, while theoretically meeting conveying requirements, may face issues such as excessive cost or insufficient conveying accuracy in practice.

[0017] Based on the above reasons, this embodiment provides a method for selecting a screw conveyor, comprising the following steps:

[0018] Step S100: Obtaining demand information, which includes at least material properties, conveying efficiency, and conveying volume error range when conveying materials; wherein the material properties include at least the viscosity and density of the material, wherein the viscosity is represented by the adhesion constant; wherein the conveying efficiency is the maximum conveying volume per minute within the error range;

[0019] Exemplarily, the adhesion constant is expressed as follows: a naturally stacked 10mm×10mm×10mm material is placed on a plane, and the angle between the plane and the horizontal plane gradually increases from 0°. When more than 50% of the material slides off the plane, the ratio of the angle between the plane and the horizontal plane to 90° is the material adhesion constant G.

[0020] Step S200: Calculate the relationship between the diameter of the screw conveyor and the semi-cone angle of the screw according to the maximum error formula;

[0021] Exemplarily, step S200 includes the following steps:

[0022] Step S201: Set the maximum error formula as follows:

[0023]

[0024] Where: E is the maximum error, K is the error correction coefficient, G is the material adhesion constant, d is the diameter of the screw conveyor, ρ is the actual density of the material, and α is the semi-cone angle of the screw. The material adhesion constant G ranges from 0 to 1. The semi-cone angle α of the screw can be smaller when conveying materials with good fluidity and can be increased appropriately when conveying materials with poor fluidity, generally between 5-70°. The larger G is, the larger the semi-cone angle α is. The semi-cone angle α is generally greater than the angle between the plane and the horizontal plane when more than 20% to 60% of the material slides off the plane when measuring the material adhesion constant G.

[0025] Step S202: The relationship between the diameter of the screw conveyor and the semi-cone angle of the screw is expressed by the following first modified formula:

[0026]

[0027] Step S300: Substitute the above relationship into the conveying capacity formula of the screw conveyor to calculate the speed range of the screw conveyor.

[0028] Exemplarily, step S300 includes the following steps:

[0029] Step S301: The following formula for the conveying capacity is set based on the relationship between the conveying capacity of the screw conveyor and its diameter and screw distance:

[0030]

[0031] Among them, Q is the maximum conveying volume per minute, d is the diameter of the screw conveyor, n is the speed, γ is the bulk density of the material, and α is the semi-cone angle of the screw;

[0032] Step S302: After the above-mentioned delivery amount formula is modified, the following second modified formula is obtained:

[0033]

[0034] Step S303: Combining the first deformation formula with the second deformation formula to form the following third deformation formula;

[0035]

[0036] Step S304: After deformation, the following fourth deformation formula is obtained, and the speed range of the screw conveyor is determined by this formula:

[0037]

[0038] In the fourth variation formula above, Q, K, G, ρ, E, and γ are all given requirements or physical parameters of the material itself, and are all known numbers, so the maximum speed requirement can be calculated. Based on the maximum speed requirement, the most economical motor can be found in the database. The database is pre-formed and includes at least information such as motor price and motor speed, as well as the price of common steel.

[0039] Step S400: Find the optimal speed and diameter in the database based on the relationship between the speed range of the screw conveyor and the diameter of the screw conveyor.

[0040] Exemplarily, the specific method of step S400 is:

[0041] The formula Substituting this into the most economical motor speed above, we get the following inequality:

[0042] in All are given requirements or physical parameters of the material itself, all are known numbers. When α is selected, That is, it is a fixed value, d2≥fixed value, and the minimum d can be obtained. d determines the amount of processing material used, and n determines the cost of the motor. Therefore, by comparing the database, the minimum value of n is found, which is the optimal solution, that is, the optimal screw conveyor selection.

[0043] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for selecting a screw conveyor, characterized in that: The steps include: Obtaining demand information, the demand information including at least a conveying efficiency and a conveying volume error range when conveying materials; wherein the material properties include at least viscosity and density of the material, wherein the viscosity is represented by an adhesion constant; wherein the conveying efficiency is a maximum conveying volume per minute within the error range; The relationship between the diameter of the screw conveyor and the semi-cone angle of the screw is calculated based on the maximum error formula; Substitute the above relationship into the screw conveyor's conveying capacity formula to find the screw conveyor's speed range; According to the relationship between the speed range of the screw conveyor and the diameter of the screw conveyor, find the optimal speed and diameter in the database; The specific method to calculate the relationship between the diameter of the screw conveyor and the semi-cone angle of the screw according to the maximum error formula is: Assume the maximum error formula is: ； in: E is the maximum error, K is the error correction coefficient, G is the material adhesion constant, d is the diameter of the screw conveyor, ρ is the true density of the material, α is the half cone angle of the spiral; The relationship between the diameter and the semi-cone angle of the spiral is expressed by the following formula: 。 2. The method for selecting a screw conveyor according to claim 1, wherein: The delivery rate formula is as follows: ； in: Q The maximum delivery volume per minute, d is the diameter of the screw conveyor, n is the rotation speed, γ is the bulk density of the material; Substituting the inequality expressing the relationship between the diameter and the semi-cone angle of the screw into the above conveying capacity formula, the speed range of the screw conveyor is as follows: 。 3. The method for selecting a screw conveyor according to claim 1, wherein: The relationship between the speed range of the screw conveyor and the diameter of the screw conveyor is determined by the following formula: ； When selected α After that, is a fixed value, that is d² ≥Fixed value, the minimum can be obtained d , d Determines the amount of processing materials. n Determines the cost of the motor.

4. The method for selecting a screw conveyor according to claim 1, wherein: The adhesion constant is expressed as 10 mm ×10 mm ×10 mm The material is placed on a plane, and the angle between the plane and the horizontal plane gradually increases from 0°. When more than 50% of the material slides off the plane, the ratio of the angle between the plane and the horizontal plane to 90° is the material adhesion constant. G .

5. The method for selecting a screw conveyor according to claim 1, wherein: When conveying materials with good fluidity, the semi-cone angle α The smaller the value; When the material conveying fluidity is poor, the semi-cone angle α The larger the value of .

6. The method for selecting a screw conveyor according to claim 1, wherein: The semi-cone angle α The value range is 5-70°; when the half cone angle α The value is greater than the adhesion constant of the measured material G When the material exceeds the set value and slides off the plane, the semi-cone angle α The value is the angle between the plane and the horizontal plane at this time.

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