Method for evaluating influence of particle size on stability of material hill and application

Abstract

The invention provides a method for evaluating the influence of the particle size on the stability of a material mountain and application, and belongs to the technical field of substrate glass powder evaluation. The fluidity and cohesiveness of the glass powder are evaluated according to the basic flow energy and bulk density of the glass powder with different particle sizes in the initial state and the change condition of each state index after the glass powder is subjected to variable-speed spiral flow, vibration consolidation, pressure head compression, ventilation, shearing, wall surface friction and inflation treatment, and the stability of the formed material pile form is further evaluated. By means of diversified fluidity characterization, the real fluidity of glass powder of different particle fractions is determined, and then the stability of a material mountain formed by putting glass powder particles of different particle fractions into a smelting furnace is determined; starting from the particle size of the glass raw material, the particle size selection direction for improving the glass quality is given, the stability of glass melting components can be effectively improved, the clarification quality of molten glass is improved, and the service life of a glass kiln and a batch feeder is prolonged, so that the glass production capacity and efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of evaluation of substrate glass powder, and in particular to an evaluation method and application of the influence of particle size on the stability of a material mountain. Background Art

[0002] As one of the key components of display devices, substrate glass directly affects the display's performance indicators such as resolution, light transmittance and viewing angle. In the process of substrate glass manufacturing, the quality of glass is affected by many factors. Among them, the particle size of raw materials is the most intuitive factor reflecting the original state of glass batch materials. Raw materials with different particle sizes will absorb different amounts of heat in the pool furnace, resulting in different melting speeds, which will directly affect the length of the material mountain, the clarity quality of the glass liquid, the stability of the glass components, and the service life of the glass kiln and feeder; in addition, raw materials with different particle sizes will also have different fluidity and uniformity, affecting the quality of glass production.

[0003] In the existing technology, the stability of the glass raw material mountain is usually improved by changing the ratio of glass raw materials or adjusting the parameters in the melting process to stabilize the glass quality. However, these methods cannot fundamentally solve the problem. The detection methods for the fluidity and uniformity of glass powder are usually complicated to operate and cannot accurately reflect the dynamic fluidity of the powder to clarify the stability of the material pile mountain. Summary of the invention

[0004] The purpose of the present invention is to provide an evaluation method and use of the influence of particle size on the stability of a pile of materials, so as to overcome the problems existing in the prior art. The present invention can evaluate the fluidity and adhesion of glass powder materials with different particle sizes in the initial state through the basic flow energy and stacking density and the changes in various state indicators of the particle size glass powder materials after variable speed spiral flow, vibration consolidation, pressure head compression, air permeability, shearing, wall friction and inflation treatment, and further judge the stability of the formed pile shape; through diversified fluidity characterization, the real fluidity of glass powder materials with different particle sizes is clarified, and then the stability of glass powder particles with different particle sizes being put into the melting furnace to form a pile of materials is clarified, which solves the problems of complex operation of the powder fluidity characterization method in the prior art and the solidification of fluidity. Starting from the particle size of glass raw materials, the present invention provides a particle size selection direction for improving glass quality, which can effectively improve the stability of glass melting components, improve the clarification quality of glass liquid, and extend the service life of glass kilns and feeders, thereby improving glass production capacity and efficiency.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A method for evaluating the effect of particle size on material mountain stability comprises the following steps: (1) Determine the raw material composition and ratio of the glass powder to be evaluated based on the composition of the material mountain to be evaluated, and prepare glass powders of different particle sizes based on the raw material ratio; (2) Conducting particle size analysis on the prepared glass powder to obtain the particle size range of the glass powder; (3) Pre-treat glass powders of different particle sizes and determine the basic flow energy and bulk density of the glass powders in their initial state; (4) The glass powder is subjected to variable speed spiral flow, vibration consolidation, pressure head compression, ventilation, shearing, wall friction and inflation process, and the relationship between flow energy and speed change, vibration energy change, compression ratio, pressure drop change, shear stress, wall friction angle, relationship between flow energy and inflation speed, and the change of bulk density after each process are obtained; (5) combining the basic flow energy and bulk density in the initial state obtained in (3) and the various indicators and bulk density after the processing steps obtained in (4), analyzing the changes in the various indicators, evaluating the properties of the glass powder, and then further evaluating the stability of the formed material pile shape; Furthermore, the above (1) is specifically as follows: determining the raw material composition and the ratio of each raw material of the glass powder to be evaluated according to the composition of the material mountain to be evaluated, weighing each component according to the group ratio, and then uniformly mixing the components to obtain glass powders of different particle sizes; Furthermore, the particle size analysis in (2) is specifically: performing particle size classification analysis on the glass powder to obtain the proportion of each particle size; Furthermore, the pretreatment in (3) is specifically as follows: using a rheometer method, the glass powder is filled into a cylindrical container, the spiral blade is located at the center of the container, and a spiral motion is gradually made from the container mouth to the bottom, and the process is repeated until the glass powder is in a homogeneous state; Furthermore, the basic flow energy of the glass powder of different particle sizes in the initial state in (3) is specifically determined as follows: after the pretreatment is completed, the glass powder on the spiral blade is brushed off, and then the upper part of the container is opened, and the excess glass powder is cut and removed, so that the glass powder is flush with the container mouth, and the spiral blade gradually moves axially downward from the container mouth at a constant speed for 1 to 7 times; during the axial movement, the work done by the torque and the resistance is calculated by software to obtain the flow energy of the glass powder; Furthermore, the variable speed spiral flow, vibration consolidation and inflation treatment in (4) is to use a vertical spiral blade to apply axial force and rotational force to the glass powder to be tested; the pressure head compression and ventilation treatment is to use a push rod to apply axial pressure and rotational force to the glass powder to be tested; the shear and wall friction treatment is to shear the glass powder under positive pressure in the shear pool; Furthermore, during the ventilation and aeration process, the bottom of the barrel is ventilated at a speed of 1 to 100 mm / s; Furthermore, the shearing treatment is specifically as follows: in the shear pool, the shear rod is pressed axially downward and rotated with its own shearing force to shear the glass powder; the wall friction treatment is specifically as follows: within the range of different normal stresses applied, the glass powder is sheared when a disc with a diameter of 23.5 mm is rotated.

[0006] Furthermore, the properties of the glass powder evaluated in (5) are specifically: If the particle size range of the glass powder is less than 100 μm, the basic flow energy is weak, and if the particle size range of the glass powder is greater than 150 μm, the basic flow energy is strong; If the flow rate index is 1.5-3.0, it is more sensitive to flow rate changes; if the flow rate index is close to 1, it is insensitive to flow rate changes; If the quotient of vibration energy and basic flow energy is larger, the consolidation is stronger; If the inflation index is between 2 and 20, it is relatively sensitive to inflation; if the inflation index is greater than 20, it is sensitive to inflation; If the compression degree is greater, the compressibility is higher; If the gas pressure drop value is larger, the air permeability of the powder is worse; If the flow index is less than 2, the flowability is poor; if the flow index is greater than 10, the flowability is good; If the value of shear stress is larger, the shear force is greater; If the wall friction angle is larger, the adhesion is stronger; If the bulk density changes little after each step of processing, the glass powder is stable; if the bulk density changes greatly after each step of processing, the glass powder is unstable. Furthermore, the stability of the pile morphology is further judged in (5) as follows: If the basic flow energy is weak, it is more sensitive to flow rate changes, the consolidation is strong, it is more sensitive to inflation, the compression degree is high, the air permeability is poor, the fluidity is poor, the shear force is large, the adhesion is strong, and the state of the glass powder is unstable, then the stability of the pile shape will be poor; If the basic flow energy is strong, it is insensitive to changes in flow rate, has weak consolidation, is sensitive to inflation, has a low degree of compression, good air permeability, good fluidity, small shear force, weak adhesion, and the state of the glass powder is stable, then the stability of the pile shape will be good.

[0007] A method for evaluating the effect of the particle size on the stability of the material mountain is used to improve the production capacity and efficiency of glass production.

[0008] The above technical solution has the following advantages or beneficial effects: The present invention provides an evaluation method for the influence of particle size on the stability of a pile of materials. By analyzing in detail the particle size state, basic flow energy, bulk density and other initial characteristics of glass powders with different particle sizes, as well as their performance in different processing links, the present invention can accurately capture the subtle changes in the physical properties of the glass powders, thereby more accurately evaluating their stability and fluidity. Through diversified fluidity characterization, the real fluidity of glass powders with different particle sizes can be clarified, and the stability of glass powders with different particle sizes being put into a melting furnace to form a pile of materials can be clarified, thus solving the problems of complex operation and solidification of the powder fluidity characterization methods in the prior art. Starting from the particle size of glass raw materials, the present invention provides a particle size selection direction for improving glass quality, which can be used to characterize the fluidity of glass raw materials. To effectively improve the stability of glass melting components, improve the clarification quality of glass liquid, extend the service life of glass kilns and feeders, thereby improving glass production capacity and efficiency; the evaluation steps of the present invention are clear and specific, the required experimental equipment and methods are relatively mature, and are easy to implement in laboratories or production sites. At the same time, through standardized experimental processes, the reliability and repeatability of the evaluation results can be ensured; the evaluation method of the present invention covers multiple key physical properties of glass powder (such as flow energy, vibration energy change, compression ratio, air permeability, etc.) and multiple processing links (such as variable speed spiral flow, vibration consolidation, etc.), and comprehensively evaluates the performance of glass powder from multiple angles, avoiding the one-sidedness of single indicator evaluation.

[0009] Furthermore, by strictly following the glass melting formula to determine the raw material composition and ratio, the accuracy and consistency of the chemical composition of the glass powder to be evaluated are ensured, which is crucial for the subsequent evaluation of the stability of the material mountain. Different chemical compositions will directly affect the physical properties and stacking behavior of the glass powder; when preparing glass powders of different particle sizes, the particle size of the glass powder can be effectively controlled by accurately weighing each component and mixing them in proportion, which is helpful to study the influence of different particle size distributions on the stability of the material mountain, thereby gaining a deeper understanding of the stacking and flow mechanism of the glass powder.

[0010] Furthermore, particle size analysis can accurately characterize the proportion of particles of different particle sizes in glass powder, which is the basis for understanding the physical properties and stacking behavior of glass powder. Through particle size grading analysis, the number or mass ratio of particles in each particle size range in glass powder can be clearly understood, providing accurate data support for subsequent analysis and evaluation.

[0011] Furthermore, the glass powder is pretreated to eliminate residual stress and air in each glass powder so that the initial states of glass powders of different particle sizes remain consistent. The rheometer method effectively promotes the mixing and uniform distribution of glass powder particles through the spiral motion of the propeller in the cylindrical container, eliminates the heterogeneity in the initial state of the glass powder, and ensures the accuracy and reliability of the experimental results. The heterogeneity of glass powder may lead to deviations in the experimental results. Pretreatment by the rheometer method can significantly reduce this deviation and improve the accuracy of the experimental data.

[0012] Furthermore, by calculating the work done by the torque and resistance through the constant speed axial motion of the propeller in the container, the basic flow energy of the powder in the initial state can be accurately measured; by stipulating the number of movements of the propeller (1 to 7 times) and the constant speed, the standardization of the operating process of each experiment is ensured, which helps to eliminate the influence of operational differences on the experimental results. Furthermore, through treatment methods such as variable speed spiral flow, vibration consolidation, and inflation, various mechanical and environmental conditions that glass powder may encounter in actual application can be simulated, which helps to more realistically reflect the physical properties and stacking behavior of glass powder and improve the accuracy and reliability of evaluation results; using vertical spiral blades and push rods and other equipment, the axial force, rotational force, and positive pressure applied to the glass powder can be accurately controlled. Parameters such as pressure, rotational force, and positive pressure can help to conduct in-depth research on the effects of different treatment conditions on the stability and fluidity of glass powder, and provide a scientific basis for optimizing the production process; through various treatment methods such as pressure head compression, breathable treatment, shearing, and wall friction, the performance of glass powder can be evaluated from different angles, and multi-angle evaluation helps to more comprehensively understand the performance characteristics of glass powder.

[0013] Furthermore, through the ventilation treatment at the bottom of the barrel, gas can be effectively introduced into the glass powder layer, improving the permeability of the glass powder, which is helpful to evaluate the gas fluidity and pore structure of the glass powder in a stacked state; appropriate ventilation speed can accelerate the interaction between glass powder particles, promote the consolidation and stability of the glass powder, and play a positive role in improving the overall stability of the material mountain; ventilation treatment can also regulate the fluidity of the glass powder to a certain extent. By controlling the ventilation speed and ventilation volume, the gas distribution and pressure state in the glass powder layer can be changed, thereby affecting the flow behavior of the glass powder, which is of great significance for optimizing the processing technology of glass powder and improving production efficiency.

[0014] Furthermore, by performing shearing treatment in a shear pool, the behavior of glass powder under shear force can be simulated more directly and accurately, thereby more realistically reflecting the physical properties and stability of the glass powder; the operation mode in which the shear rod presses axially downward and rotates with its own shear force makes the application of shear force more precise and controllable. By adjusting parameters such as the pressure, rotation speed and shear time of the shear rod, precise control of the shear conditions can be achieved, thereby in-depth research on the effects of different shear conditions on the stability and fluidity of the glass powder.

[0015] Furthermore, by controlling the range of applied normal stress, when a fixed diameter disc is used for rotational shearing, the friction conditions between the glass powder and the wall in actual applications can be accurately simulated, which helps to more accurately evaluate the stability and fluidity of the glass powder under the action of wall friction; by performing shear treatment within different normal stress ranges, the effect of wall friction on the interaction between glass powder particles, stacking structure and overall stability can be comprehensively evaluated.

[0016] The present invention also provides a method for evaluating the effect of particle size on the stability of a material mountain. Since unreasonable particle size distribution may lead to defects such as bubbles and inclusions in glass products, thereby increasing the scrap rate, by evaluating the effect of particle size on the stability of a material mountain, the particle size problem can be discovered and adjusted in a timely manner, and problems such as collapse of the material mountain or poor flow caused by uneven particle size can be reduced, thereby ensuring the continuity and stability of the production process and improving product quality and production efficiency. Particle size evaluation not only focuses on the raw materials themselves, but also involves various links in the production process. By evaluating the effect of particle size on the stability of the material mountain, bottlenecks and potential problems in the production process can be identified, providing a scientific basis for optimizing the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a flow chart of a method for evaluating the effect of particle size on material mountain stability. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it. In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. 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 creative work should fall within the scope of protection of the present invention. It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0019] A method for evaluating the effect of particle size on material mountain stability comprises the following steps: (1) Determine the composition of the material mountain to be evaluated based on the glass melting formula, determine the raw material composition and the ratio of each raw material of the glass powder to be evaluated, weigh each component according to the raw material ratio, and then evenly mix the components to obtain glass powders of different particle sizes; (2) performing particle size classification analysis on the glass powder obtained in (1), obtaining the proportion of each particle size, and clarifying the particle size range of the glass powder; (3) For glass powders of different particle sizes, the rheometer method is used to fill the cylindrical container with glass powder. The propeller is located at the center of the container and gradually moves axially downward from the container mouth to the bottom. Repeat until the glass powder is in a homogeneous state to eliminate the gaps and gas between the particles during the powder filling process, thereby eliminating the influence of powder filling operation or uneven particles; then brush off the glass powder on the spiral blade, open the upper half of the container, cut and remove the excess glass powder, so that the glass powder is flush with the container mouth, and the spiral blade gradually moves axially downward at a constant speed 1 to 7 times. During the axial movement, the work done by torque and resistance is calculated by software to obtain the flow energy of the glass powder; then use a mass balance to weigh the mass of the filled glass powder, and the mass / volume is the bulk density of the glass powder in the initial state; (4) The glass powder of each particle size is subjected to variable speed spiral flow, vibration consolidation, pressure head compression, ventilation, shearing, wall friction and inflation process, and the relationship between flow energy and speed change, vibration energy change, compression ratio, pressure drop change, shear stress, wall friction angle, relationship between flow energy and inflation speed, and the change of bulk density after each process are obtained; Preferably, the variable speed spiral flow, vibration consolidation and aeration treatment is to use a vertical spiral blade to apply axial force and rotational force to the glass powder to be tested; the pressure head compression and ventilation treatment is to use a push rod to apply axial pressure and rotational force to the glass powder to be tested; the shear and wall friction treatment is to shear the glass powder under positive pressure in the shear pool; Preferably, during the ventilation and inflation process, the bottom of the barrel is ventilated at a ventilation speed of 1 to 100 mm / s; Preferably, the shearing treatment is specifically: in the shearing pool, the shearing rod is pressed axially downward and rotated with its own shearing force to shear the glass powder; the wall friction treatment is specifically: within the range of different normal stresses applied, the glass powder is sheared when a circular disc with a diameter of 23.5 mm is rotated; (5) Combining the basic flow energy and bulk density in the initial state obtained in (3) and the various indicators and bulk density after the processing steps obtained in (4), the changes in the various indicators are analyzed to evaluate the properties of the glass powder, and then the stability of the formed material pile shape is further evaluated, specifically: If the particle size range of the glass powder is less than 100 μm, the basic flow energy is weak, and if the particle size range of the glass powder is greater than 150 μm, the basic flow energy is strong; If the flow rate index is 1.5-3.0, it is more sensitive to flow rate changes; if the flow rate index is close to 1, it is insensitive to flow rate changes; If the quotient of vibration energy and basic flow energy is larger, the consolidation is stronger; If the inflation index is between 2 and 20, it is relatively sensitive to inflation; if the inflation index is greater than 20, it is sensitive to inflation; If the compression degree is greater, the compressibility is higher; If the gas pressure drop value is larger, the air permeability of the powder is worse; If the flow index is less than 2, the flowability is poor; if the flow index is greater than 10, the flowability is good; If the value of shear stress is larger, the shear force is greater; If the wall friction angle is larger, the adhesion is stronger; If the bulk density changes little after each step of processing, the glass powder is stable; if the bulk density changes greatly after each step of processing, the glass powder is unstable. If the basic flow energy is weak, it is more sensitive to flow rate changes, the consolidation is strong, it is more sensitive to inflation, the compression degree is high, the air permeability is poor, the fluidity is poor, the shear force is large, the adhesion is strong, and the state of the glass powder is unstable, then the stability of the pile shape will be poor; If the basic flow energy is strong, it is insensitive to changes in flow rate, has weak consolidation, is sensitive to inflation, has a low degree of compression, good air permeability, good fluidity, small shear force, weak adhesion, and the state of the glass powder is stable, then the stability of the pile shape will be good.

[0020] A method for evaluating the effect of the particle size on the stability of the material mountain is used to improve the production capacity and efficiency of glass production.

[0021] Embodiment 1: like Figure 1 As shown, the present invention provides a method for evaluating the effect of particle size on material mountain stability, comprising the following steps: (1) Determine the composition of the material mountain to be evaluated based on the glass melting formula, determine the raw material composition and the ratio of each raw material of the glass powder to be evaluated, weigh each component according to the raw material ratio, and then put each component into a mixer and mix them evenly to obtain glass powders of different particle sizes; (2) Performing particle size classification analysis on the glass powder obtained in (1) to obtain the proportion of each particle size, and clarifying that the particle size range of the glass powder is 10-100 μm; (3) The glass powder is subjected to the rheometer method. The glass powder is filled into a cylindrical container. The propeller is located at the center of the container. The container gradually moves axially downward to the bottom. The process is repeated until the glass powder is homogeneous. The residual stress and air in each glass powder are eliminated, so that the initial state of glass powders of different particle sizes is consistent. The glass powder on the propeller is then brushed off. The upper part of the container is opened, and the excess glass powder is cut and removed. The glass powder is flush with the container mouth. The propeller moves axially from the container mouth to the bottom at a constant speed for 1 to 7 times. During the axial movement, the work done by the torque and the resistance is calculated by the software, and the flow energy of the glass powder is 103.86 mJ. The mass of the filled glass powder is weighed with a mass balance. The mass / volume is the bulk density of the glass powder in the initial state. The bulk density is 0.79 g / ml. (4) The glass powder was subjected to variable speed spiral flow, vibration consolidation, pressure head compression, ventilation, shearing, wall friction and inflation. The relationship between flow energy and velocity change (flow rate index) was 2.60, the vibration energy change was 2729.90 mJ, the compression degree accounted for 32.66%, the gas pressure drop change was 58.1 kPa, the relationship between flow energy and inflation speed (flow index) was 1.82, the inflation index was 3.67 AR, the shear stress was 17.48 kPa, and the wall friction angle was 26.75°. The bulk density after vibration consolidation was 1.33 g / ml, the bulk density after pressure head compression was 0.96 g / ml, the bulk density after ventilation was 0.8 g / ml, the bulk density after wall friction angle was 1.17 g / ml, the bulk density after shearing was 1.21 g / ml, the bulk density after variable speed spiral flow was 0.94 g / ml, and the bulk density after inflation was 0.77 g / ml; the change in bulk density before and after vibration is 0.54 g / ml, the change in bulk density before and after compression is 0.17 g / ml, the change in bulk density before and after ventilation is 0.01 g / ml, the change in bulk density before and after wall friction is 0.38 g / ml, the change in bulk density before and after shear is 0.42 g / ml, the change in bulk density before and after variable speed spiral flow is 0.15 g / ml, and the change in bulk density before and after inflation is 0.02 g / ml; Preferably, the variable speed spiral flow, vibration consolidation and aeration treatment is to use a vertical spiral blade to apply axial force and rotational force to the glass powder to be tested; the pressure head compression and ventilation treatment is to use a push rod to apply axial pressure and rotational force to the glass powder to be tested; the shear and wall friction treatment is to shear the glass powder under positive pressure in the shear pool; Preferably, during the ventilation and inflation process, the bottom of the barrel is ventilated at a ventilation speed of 1 to 100 mm / s; Preferably, the shearing treatment is specifically: in the shearing pool, the shearing rod is pressed axially downward and rotated with its own shearing force to shear the glass powder; the wall friction treatment is specifically: within the range of different normal stresses applied, the glass powder is sheared when a circular disc with a diameter of 23.5 mm is rotated; (5) Combining the basic flow energy and bulk density in the initial state obtained by (3) and the various indicators and bulk density after the processing steps obtained by (4), according to the test results, the basic flow energy of Example 1 is weaker, it is more sensitive to changes in flow rate, has stronger consolidation than Example 2, is more sensitive to inflation, has a higher degree of compression than Example 2, has poorer air permeability than Example 2, has poorer fluidity, has greater shear force than Example 2, has a larger wall friction angle than Example 2, has strong adhesion, and has a large change in bulk density after the processing steps. The state of the glass powder is unstable and is easily affected by vibration consolidation, inflation, wall friction, etc.; for feeding, the particle size of Example 1 is small and has strong adhesion. During spiral feeding, it is very likely to adhere to the spiral propulsion mechanism and the wall of the device; for the shape of the material mountain, the particle size of Example 1 has strong adhesion and is more compact, but is easily affected by the surrounding environment and has poor stability.

[0022] Embodiment 2: like Figure 1 As shown, the present invention provides a method for evaluating the effect of particle size on material mountain stability, comprising the following steps: (1) Determine the composition of the material mountain to be evaluated based on the glass melting formula, determine the raw material composition and the ratio of each raw material of the glass powder to be evaluated, weigh each component according to the raw material ratio, and then put each component into a mixer and mix them evenly to obtain glass powders of different particle sizes; (2) Performing particle size classification analysis on the glass powder obtained in (1) to obtain the proportion of each particle size, and clarifying that the particle size range of the glass powder is 150-350 μm; (3) The glass powder is subjected to the rheometer method. The glass powder is filled into a cylindrical container. The propeller is located at the center of the container. The container gradually moves axially downward to the bottom. The process is repeated until the glass powder is homogeneous. The residual stress and air in each glass powder are eliminated, so that the initial state of glass powders of different particle sizes is consistent. The glass powder on the propeller is then brushed off. The upper part of the container is opened and the excess glass powder is cut off. The glass powder is flush with the container mouth. The propeller moves axially from the container mouth to the bottom at a constant speed for 1 to 7 times. During the axial movement, the work done by the torque and the resistance is calculated by the software. The flow energy of the glass powder is 720.50 mJ. The mass of the filled glass powder is weighed with a mass balance. The mass / volume is the bulk density of the glass powder in the initial state. The bulk density is 1.28 g / ml. (4) The glass powder was subjected to variable speed spiral flow, vibration consolidation, pressure head compression, ventilation, shearing, wall friction and inflation process. The relationship between flow energy and velocity change (flow rate index) was 1.02, the vibration energy change was 3435 mJ, the compression degree accounted for 1.91%, the gas pressure drop change was 0.64 kPa, the relationship between flow energy and inflation speed (flow index) was 54.33, the inflation index was 2.55 AR, the shear stress was 14.74 kPa, and the wall friction angle was 18.87°. The bulk density after vibration consolidation was 1.56 g / ml, the bulk density after pressure head compression was 1.28 g / ml, the bulk density after ventilation was 1.3 g / ml, the bulk density after wall friction angle was 1.3 g / ml, the bulk density after shearing was 1.27 g / ml, the bulk density after variable speed spiral flow was 1.25 g / ml, and the bulk density after inflation was 1.29 g / ml; the change in bulk density before and after vibration is 0.28 g / ml, the change in bulk density before and after compression is 0 g / ml, the change in bulk density before and after ventilation is 0.02 g / ml, the change in bulk density before and after wall friction is 0.02 g / ml, the change in bulk density before and after shear is 0.01 g / ml, the change in bulk density before and after variable speed spiral flow is 0.03 g / ml, and the change in bulk density before and after inflation is 0.01 g / ml; Preferably, the variable speed spiral flow, vibration consolidation and aeration treatment is to use a vertical spiral blade to apply axial force and rotational force to the glass powder to be tested; the pressure head compression and ventilation treatment is to use a push rod to apply axial pressure and rotational force to the glass powder to be tested; the shear and wall friction treatment is to shear the glass powder under positive pressure in the shear pool; Preferably, during the ventilation and inflation process, the bottom of the barrel is ventilated at a ventilation speed of 1 to 100 mm / s; Preferably, the shearing treatment is specifically: in the shearing pool, the shearing rod is pressed axially downward and rotated with its own shearing force to shear the glass powder; the wall friction treatment is specifically: within the range of different normal stresses applied, the glass powder is sheared when a circular disc with a diameter of 23.5 mm is rotated; (5) Combining the basic flow energy and packing density in the initial state obtained by (3) and the various indicators and packing density after the processing steps obtained by (4), according to the test results, the basic flow energy of Example 2 is stronger, it is not sensitive to flow rate changes, it has weaker consolidation than Example 1, it is sensitive to inflation, it has a lower degree of compression than Example 1, it has better air permeability than Example 1, it has good fluidity, it has smaller shear force than Example 1, it has a smaller wall friction angle than Example 1, it has weaker adhesion, and the change in packing density after the processing steps is small. The state of the glass powder is stable, and it requires more energy to change the state; for feeding, the particle size of Example 2 is larger, the adhesion is weaker, the spiral feeding is smoother, but the spiral propulsion requires more energy; for the shape of the material mountain, the particle size of Example 2 is not easily affected by the surrounding environment and it has stronger stability.

[0023] The fluidity test parameters of Example 1 and Example 2 are as follows: Table 1 Example of flowability test parameters

[0024] Table 2 Comparison of example bulk density

[0025] The indicators mentioned in the present invention are explained below: Relationship between flow energy and speed change: By changing the axial movement speed of the spiral, the work done by torque and resistance is calculated through software to obtain the "flow energy" of the powder at different speeds, that is, the energy required for the spiral blade to penetrate the powder sample from top to bottom.

[0026] Vibration energy: The propeller is compressed or vibrated axially. The software calculates the torque and resistance and obtains the relationship between different vibration energies and flow energy.

[0027] Compression ratio and compression change: The pressure head is compressed axially, and the relationship between the compression axial pressure and the compression volume is recorded by software.

[0028] Shear stress: When operating in a shear cell, the shear rod is pressed axially downward and rotated with its own shear force. The relationship between shear stress and axial pressure is recorded by software; maximum shear stress / unbounded yield stress = flow index.

[0029] Wall friction: The frictional resistance of powder shear is measured when a 23.5 mm diameter disc (grade 316, sanded surface Ra=1.2 um) is rotated within the applied normal stress range. The wall friction angle (WFA) directly reflects the frictional resistance of powder to the wall.

[0030] Relationship between aeration and flow energy: ventilate from the bottom of the container, change the gas velocity, and measure the energy of the axial spiral motion of the propeller.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for evaluating the effect of particle size on material mountain stability, characterized in that: The following steps are involved: S1, determining the raw material composition and the ratio of each raw material of the glass powder to be evaluated according to the composition of the material mountain to be evaluated, and preparing glass powders of different particle sizes according to the raw material ratio; S2, performing a particle size analysis on the prepared glass powder to obtain a particle size range of the glass powder; S3, pre-treating the glass powder and determining the basic flow energy and bulk density of the glass powder in an initial state; S4, subjecting the glass powder to variable speed spiral flow, vibration consolidation, pressure head compression, ventilation, shearing, wall friction and inflation processes, and obtaining the relationship between flow energy and speed change, vibration energy change, compression ratio, pressure drop change, shear stress, wall friction angle, relationship between flow energy and inflation speed, and the change in bulk density after each process; S5, combining the basic flow energy and packing density in the initial state obtained in S3 and the various indicators and packing density after the step processing obtained in S4, analyze the changes in various indicators, evaluate the properties of the glass powder, and then further evaluate the stability of the formed material pile shape.

2. The method for evaluating the effect of particle size on material mountain stability according to claim 1, characterized in that: The S1 specifically includes: determining the raw material composition and the ratio of each raw material of the glass powder to be evaluated according to the composition of the material mountain to be evaluated, weighing each component according to the group distribution ratio, and then uniformly mixing the components to obtain glass powders with different particle sizes.

3. The method for evaluating the effect of particle size on material mountain stability according to claim 1, characterized in that: The particle size analysis in S2 specifically includes: performing particle size classification analysis on the glass powder to obtain the proportion of each particle size.

4. The method for evaluating the effect of particle size on material mountain stability according to claim 1, characterized in that: The pretreatment in S3 is specifically as follows: using a rheometer method, the glass powder is filled into a cylindrical container, the spiral blade is located at the center of the container, and gradually moves axially downward from the container mouth to the bottom, and the process is repeated until the glass powder is in a homogeneous state.

5. The method for evaluating the effect of particle size on material mountain stability according to claim 4, characterized in that: The basic flow energy of glass powder of different particle sizes in the initial state is determined in S3 as follows: after the pretreatment is completed, the glass powder on the spiral blade is brushed off, and then the upper part of the container is opened, and the excess glass powder is cut and removed, so that the glass powder is flush with the container mouth, and the spiral blade gradually moves axially downward from the container mouth at a constant speed for 1 to 7 times; during the axial movement, the work done by the torque and the resistance is calculated by software to obtain the flow energy of the glass powder.

6. The method for evaluating the effect of particle size on material mountain stability according to claim 1, characterized in that: The variable speed spiral flow, vibration consolidation and inflation treatment in S4 is to use vertical spiral blades to apply axial force and rotational force to the glass powder to be tested; the pressure head compression and ventilation treatment is to use a push rod to apply axial pressure and rotational force to the glass powder to be tested; the shear and wall friction treatment is to shear the glass powder under positive pressure in the shear pool.

7. The method for evaluating the effect of particle size on material mountain stability according to claim 6, characterized in that: During the aeration process and the ventilation process, the bottom of the barrel is ventilated at a ventilation speed of 1 to 100 mm / s.

8. The method for evaluating the effect of particle size on material mountain stability according to claim 6, characterized in that: The shearing is specifically as follows: in the shear pool, the shear rod is pressed axially downward and rotated with its own shear force to shear the glass powder; the wall friction treatment is specifically as follows: within the range of different normal stresses applied, the glass powder is sheared when a disc with a diameter of 23.5 mm is rotated.

9. The method for evaluating the effect of particle size on material mountain stability according to claim 1, characterized in that: The properties of the glass powder evaluated in S5 are specifically: If the particle size range of the glass powder is less than 100 μm, the basic flow energy is weak, and if the particle size range of the glass powder is greater than 150 μm, the basic flow energy is strong; If the flow rate index is 1.5-3.0, it is more sensitive to flow rate changes; if the flow rate index is close to 1, it is insensitive to flow rate changes; If the quotient of vibration energy and basic flow energy is larger, the consolidation is stronger; If the inflation index is between 2 and 20, it is relatively sensitive to inflation; if the inflation index is greater than 20, it is sensitive to inflation; If the compression degree is greater, the compressibility is higher; If the gas pressure drop value is larger, the air permeability of the powder is worse; If the flow index is less than 2, the flowability is poor; if the flow index is greater than 10, the flowability is good; If the value of shear stress is larger, the shear force is greater; If the wall friction angle is larger, the adhesion is stronger; If the bulk density changes little after processing in each link, the glass powder is in a stable state; if the bulk density changes greatly after processing in each link, the glass powder is in an unstable state.

10. Use of the method for evaluating the effect of particle size on the stability of a material mountain according to any one of claims 1 to 9 for improving the capacity and efficiency of glass production.

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