Silo system with fluid vibrator and control method

Abstract

This invention relates to a silo system with a modified fluid vibrator, comprising a silo, a modified fluid vibrator, a monitoring device, and a data processing device. The modified fluid vibrator includes a modified fluid and a vibrator, which is connected to the modified fluid via a telescopic rod and an excitation spring coaxially mounted with the silo, enabling the modified fluid to perform simple harmonic motion. The telescopic rod is used to adjust the height of the modified fluid. A pressure sensor is installed on the surface of the modified fluid and connected to the data processing device. The monitoring device monitors the material flow status and discharge rate within the silo in real time and transmits the data to the data processing device. The modified fluid has a spherical structure, and the relationship between the modified fluid's diameter, height, vibration amplitude, angular velocity, and the silo's discharge rate is determined by a relational model. The data processing device calculates a coefficient corresponding to a specific discharge rate based on the relational model, and adjusts the coefficient value to control the silo's discharge rate. This invention improves silo unloading efficiency and solves material blockage and arching problems.

Description

Technical Field

[0001] This invention relates to the field of silo technology, and in particular to a silo system and control method with a modified fluid vibrator. Background Technology

[0002] Silos have wide applications in industry and agriculture, primarily for storing and transporting materials. Silo discharge is a critical process, but the complexity of material flow often leads to problems such as arching, blockage, and stagnation. Therefore, discharge rate becomes an important parameter for evaluating silo performance. Common methods to improve discharge rate include increasing the silo opening diameter and optimizing the silo shape, but these methods are limited by the silo structure. Another more common and effective method is to install vibrators on the silo wall. This method has two main implementation forms: one is vibrating the silo wall, with the vibrator installed on the silo wall to vibrate the entire device. This method is energy-intensive and may damage the silo, making it unsuitable for silos with complex structures. The other method involves installing a fluid inside the silo and connecting the vibrator to the fluid, using the vibration inside the silo to break up the material structure and improve the discharge rate. This method not only significantly improves the discharge rate but also consumes less energy and causes less wear on the vibration system and the silo. However, due to insufficient consideration of the structure and position design of the fluid, problems such as low material discharge rate and high energy consumption still exist under different working conditions. For example, when the material viscosity is high, the vibration system will make the material more compacted, aggravating the blockage, and manual unloading is required, which seriously affects production efficiency. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a silo system and control method with a modified fluid vibrator, which improves silo unloading efficiency and solves the problems of material blockage and arching.

[0004] The technical solution adopted in this invention is as follows:

[0005] This invention provides a silo system with a modified fluid vibrator, comprising a silo, a modified fluid vibrator, a monitoring device, and a data processing device;

[0006] The modified fluid vibrator includes a modified fluid and a vibrator. The vibrator is located at the center of the top of the silo, and the modified fluid is located on the central axis inside the silo. The vibrator is connected to the modified fluid through a telescopic rod and an excitation spring that are coaxially arranged with the silo, enabling the modified fluid to perform simple harmonic motion. The telescopic rod is used to adjust the height of the modified fluid.

[0007] The controller of the vibrator is connected to the data processing device;

[0008] The surface of the modified fluid is equipped with a pressure sensor, which is connected to the data processing device;

[0009] The monitoring device is located at the bottom of the silo and is used to monitor the material flow status and discharge rate in the silo in real time, and transmit the data to the data processing device.

[0010] The modified fluid has a spherical structure. The relationship between the modified fluid's diameter, height, vibration amplitude, angular velocity ω, and the silo's discharge rate is determined by the following model:

[0011]

[0012] In the formula, Q is the feed rate of the fluid after vibration is applied, in g / s; Q0 is the feed rate of the fluid without vibration, in g / s; k and c are fitting coefficients, respectively; and Froude number. g is the acceleration due to gravity; Among them, h i The height is the distance from the bottom of the fluid to the silo outlet, measured in mm; A is the vibration amplitude, measured in mm; D is the silo outlet diameter, measured in mm; d is the material particle diameter, measured in mm; d i The diameter of the fluid;

[0013] The data processing device calculates Fr corresponding to a specific feed rate based on the relational model. * By adjusting Fr * The value is used to control the silo discharge rate.

[0014] The further technical solution is as follows:

[0015] The bottom of the silo is made of transparent material.

[0016] The present invention also provides a control method for a silo system with a modified fluid vibrator, the control method including unloading control, wherein the unloading control is for a selected modified fluid, and its height is optimized and adjusted to meet a set unloading rate target, including the following steps:

[0017] S101. Measure material parameters, including particle size and density;

[0018] S102. After the silo is filled with material, adjust the fluid to the initial height, start the vibrator and start it in sequence with the first set and the second set of operating parameters to unload the material. The monitoring device calculates the discharge rate Q1 and Q2 of the silo outlet under the two sets of operating parameters.

[0019] The data processing device calculates Fr corresponding to the two discharge rates based on the operating parameters and the material parameters obtained in S101. * value Fr1 * Fr2 * Based on Fr1 * Fr2 *Q1 and Q2 obtain the values ​​of the two fitting parameters k and c, and then, based on the set target feeding rate Q... t1 The values ​​of the fitting parameters are calculated to obtain the corresponding Fr. * value Fr t1 * Then, by combining the diameter of the modified fluid and the diameter of the silo outlet, the height of the modified fluid under the actual operating parameters of the vibrator is calculated, thus obtaining the optimized height value; the operating parameters include vibration amplitude and vibration frequency.

[0020] S103. By extending and retracting the telescopic rod, the height of the fluid reaches the optimized height value.

[0021] In step S102, when the actual operating parameters of the vibrator change, the data processing device recalculates the corresponding fluid height and transmits it to the controller of the telescopic rod, which adjusts the length of the telescopic rod to make the fluid height reach the optimized value again.

[0022] Step S102 also includes:

[0023] When the actual height of the fluid changes according to the operating conditions, the data processing device automatically calculates and re-reaches Fr. t * The corresponding operating parameters of the vibrator are transmitted to the vibrator controller to adjust the vibration amplitude and frequency.

[0024] The monitoring device obtains the discharge rate of the silo outlet by calculating the ratio of the measured mass of material flowing out of the silo outlet to the time.

[0025] The control method further includes optimizing the operating parameters of the modified fluid and the vibrator, selecting the optimized modified fluid for unloading under optimized operating parameters, so that the system achieves optimal energy consumption while meeting the unloading rate requirements, including the following steps:

[0026] S201. Obtain the discharge rate Q0 of the fluid without applied vibration, and increase the discharge rate Q using unit energy consumption. E To assess the economics of energy consumption, Q E = (Q-Q0) / W, where W is the total energy consumption of the unloading process, which is calculated based on the pressure distribution and displacement detected by the pressure sensor;

[0027] S202. Calculate Q corresponding to multiple sets of different modified fluid diameters and heights. E , obtain Q E With Fr * Relationship diagram, determine Q based on the relationship diagram. E Fr at peak value * value Fr t2 * ;

[0028] S203. Preset a modified fluid diameter, combined with the set target discharge rate Q. t2 The fluid height is determined from the selectable range based on the aforementioned relationship model; then, the vibration amplitude and frequency of the vibrator are continuously adjusted to determine Fr. * Value and Fr t2 * If the error meets the requirements, update the preset fluid diameter and repeat S203; if it meets the requirements, complete the parameter optimization.

[0029] In step S203, the initial value of the modified fluid diameter is set to be the smallest, and it gradually increases in subsequent iterations.

[0030] The beneficial effects of the present invention are as follows:

[0031] This invention monitors the unloading process to obtain the discharge rate and automatically adjusts the fluid height based on a relational model to improve material flowability. It also monitors the pressure distribution of the fluid and calculates the energy consumption of the unloading process. Through fluid optimization design, it provides a more energy-efficient solution, improving system economy and extending system lifespan.

[0032] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the silo system according to an embodiment of the present invention.

[0034] Figure 2 This is a schematic diagram of the modified fluid structure according to an embodiment of the present invention.

[0035] In the diagram: 1. Vibrator; 2. Telescopic rod; 3. Excitation spring; 4. Fluid converter; 5. Silo; 6. Silo base; 7. Pressure sensor; 8. Monitoring device; 9. Data processing device. Detailed Implementation

[0036] The specific embodiments of the present invention are described below with reference to the accompanying drawings.

[0037] See Figure 1 and Figure 2 This embodiment of a silo system with a modified fluid vibrator includes a silo 5, a modified fluid vibrator, a monitoring device 8, and a data processing device 9.

[0038] The modified fluid vibrator includes a modified fluid 4 and a vibrator 1. The vibrator 1 is located at the top center of the silo 5. The modified fluid 4 is located on the central axis inside the silo 5. The vibrator 1 is connected to the modified fluid 4 through a telescopic rod 2 and an excitation spring 3 that are coaxially arranged with the silo 5, which enables the modified fluid 4 to perform simple harmonic motion. The telescopic rod 2 is used to adjust the height of the modified fluid 4.

[0039] The controller of vibrator 1 is connected to the data processing device 9 and is used to transmit the operating parameters of the vibrator to the data processing device.

[0040] A pressure sensor 7 is provided on the surface of the fluid and is connected to the data processing device to monitor pressure changes;

[0041] The monitoring device 8 is located on the silo base 6 at the bottom of the silo 5. It is used to monitor the material flow status and discharge rate in the silo 5 in real time and transmit the data to the data processing device. The silo outlet is located at the center of the silo base 6.

[0042] In this example, the modified fluid 4 is preferably a spherical structure. The relationship between the diameter, height, vibration amplitude, angular velocity ω of the modified fluid, and the discharge rate of the silo is determined by the following relationship model:

[0043]

[0044] In the formula, Q is the discharge rate of the fluid after vibration is applied, in g / s; Q0 is the discharge rate of the fluid without vibration, in g / s; k and c are fitting coefficients, respectively.

[0045] Froude number g is the acceleration due to gravity;

[0046] Among them, h i The height is the distance from the bottom of the fluid to the silo outlet, measured in mm; A is the vibration amplitude, measured in mm; D is the silo outlet diameter, measured in mm; d is the material particle diameter, measured in mm; d i The diameter of the fluid;

[0047] The data processing device calculates Fr corresponding to a specific feed rate based on the relational model. * By adjusting Fr * The value is used to control the material discharge rate of the silo.

[0048] The bottom of the silo should preferably be made of transparent material to facilitate monitoring devices to monitor the flow of materials inside the silo.

[0049] The fluid is preferably made of steel to ensure a certain level of mechanical strength.

[0050] This embodiment also provides a control method for the silo system with the modified fluid vibrator, the control method including unloading control, wherein the unloading control is to optimize and adjust the height of the selected modified fluid to meet a set unloading rate target, including the following steps:

[0051] S101. Measure material parameters, including particle size and density;

[0052] The average particle size of a material can be obtained through direct measurement or on-site photography. Specific methods include: randomly selecting materials of different sizes, obtaining high-resolution digital images of the materials using a digital camera, then using image processing software to remove the background and apply Gaussian blur to the digital images, obtaining a statistical count of the number of different particle sizes in the photograph, and finally obtaining the average particle size of the material.

[0053] The density of a material can be determined using the specific gravity bottle method. The specific gravity bottle is filled with the material, its mass is weighed, and the density of the material is calculated using the known volume of the specific gravity bottle.

[0054] S102. After the silo is filled with material, adjust the fluid to the initial height, start the vibrator and start it in sequence with the first set and the second set of operating parameters to unload the material. The monitoring device calculates the discharge rate Q1 and Q2 of the silo outlet under the two sets of operating parameters.

[0055] The data processing device calculates Fr corresponding to the two discharge rates based on the operating parameters and the material parameters obtained in S101. * value Fr1 * Fr2 * Based on Fr1 * Fr2 * Q1 and Q2 obtain the values ​​of the two fitting parameters k and c, and then, based on the set target feeding rate Q... t1 The values ​​of the fitting parameters are calculated to obtain the corresponding Fr. * value Fr t1 * Then, by combining the diameter of the modified fluid and the diameter of the silo outlet, the height of the modified fluid under the actual operating parameters of the vibrator is calculated, thus obtaining the optimized height value; the operating parameters include vibration amplitude and vibration frequency.

[0056] When the actual height of the fluid changes according to the operating conditions, the data processing device automatically calculates and re-reaches Fr. t * The corresponding operating parameters of the vibrator are transmitted to the vibrator controller to adjust the vibration amplitude and frequency.

[0057] When the actual operating parameters of the vibrator change, the data processing device recalculates the corresponding fluid height and transmits it to the controller of the telescopic rod. The controller then adjusts the length of the telescopic rod to bring the fluid height back to the optimized value.

[0058] In the specific implementation process, to effectively control fluid vibration, the vibration amplitude was set to 2 mm and the vibration frequency to 70 Hz. Under the combined action of gravity and vibration, the material flows towards the discharge port. Vibration reduces the volume fraction of the fluid below the discharge point, increases the porosity between particles, and thus accelerates material flow. Discharge should be stopped within 1 to 2 minutes after commencement, without waiting for all material to flow out of the silo. This operation ensures the efficiency of the test process, and the material discharge rate is minimally affected by time during discharge. The discharge rates Q1 and Q2 can be determined by measuring the ratio of the amount of material flowing out of the silo to the time taken using a monitoring device.

[0059] S103. By extending and retracting the telescopic rod, the height of the fluid reaches the optimized height value.

[0060] Among them, the target material feeding rate Q t1 The target material yield Q is typically quite large, meaning that it may be difficult to meet the requirement without simply optimizing parameter control. This applies to different target material yields Q. t1 The diameter and height of the modified fluid can be adjusted preferentially according to the aforementioned relationship model formula, wherein the diameter of the modified fluid increases with the increase of the feeding rate, and the height of the modified fluid initially increases and then decreases with the increase of the feeding rate. Under the working conditions to be satisfied in this embodiment, Fr * A value of 4 to 6 is considered to be most favorable for unloading rate.

[0061] The control method for the silo system with modified fluid vibrator in this embodiment further includes optimizing the operating parameters of the modified fluid and the vibrator, and using the optimized modified fluid for unloading under optimized operating parameters, so that the system achieves optimal energy consumption while meeting the discharge rate requirements. This includes the following steps:

[0062] S201. Obtain the discharge rate Q0 of the fluid without applied vibration, and increase the discharge rate Q using unit energy consumption. E To assess the economics of energy consumption, Q E = (Q-Q0) / W, where W is the total energy consumption of the unloading process, which can be calculated using a data processing device based on the fluid pressure distribution and displacement.

[0063] S202. Calculate Q corresponding to multiple sets of different modified fluid diameters and heights. E , obtain Q E With Fr * Relationship diagram, determine Q based on the relationship diagram. E Fr at peak value * value Fr t2* ;

[0064] S203. Preset a modified fluid diameter, combined with the set target discharge rate Q. t2 The fluid height is determined from the selectable range based on the aforementioned relationship model; then, the vibration amplitude and frequency of the vibrator are continuously adjusted to determine Fr. * Value and Fr t2 * Check if the error meets the requirements. If not, repeat step S203. If it does, complete the parameter optimization.

[0065] The relationship diagram obtained in step S202 shows that the fluid diameter has the greatest impact on energy consumption; the larger the fluid diameter, the higher the feed rate Q per unit of energy consumption. E The smaller the value, and the more different the operating conditions, the better. E With Fr * The value initially increases and then decreases, with its peak occurring approximately at Fr. * =0.18. High Q E The value indicates that under this operating condition, a higher material feeding rate can be achieved with lower energy consumption, thus resulting in better economic efficiency. That is, Fr t2 * When the value is 0.18, it is most conducive to the economy and efficiency of silos.

[0066] Among them, the target material feeding rate Q t2 It is usually relatively small, meaning it is relatively easy to satisfy. When Fr * When the value is low and the feeding rate already meets production needs, the fluid vibration device can be adjusted to reduce energy consumption and wear of the vibration device, thereby extending the service life of the equipment.

[0067] In the above optimization design process, the primary task is to minimize the diameter of the modified fluid while ensuring that no blockage occurs during the unloading process. Therefore, the initial value of the modified fluid diameter preset in step S203 is the smallest, and it gradually increases in subsequent iterations. Next, the target unloading rate Q is set. t2 Determining the appropriate height of the modified fluid is crucial. A lower fluid height can lead to blockages, while a higher height has minimal impact on the unloading process. To ensure the target discharge rate is achieved even at lower vibration intensities, the fluid height must be precisely set first. Subsequently, by adjusting the vibration frequency and amplitude, Fr... * The value was adjusted to approximately 0.18. It can be understood that, for different operating conditions, the optimal Fr... * The values ​​may deviate. Therefore, this invention employs a data processing device to calculate and adjust the fluid height, vibration frequency, and amplitude until optimal performance is achieved. This dynamic adjustment mechanism ensures that the invention maintains high-efficiency unloading performance under varying operating conditions.

[0068] Using an optimized design parameter design system, after installing the optimized modified fluid vibration device, the position of the modified fluid is precisely controlled by adjusting the telescopic rod to ensure that the position adjustment meets the design requirements before the silo filling operation. After the unloading begins, the silo's discharge rate and energy consumption are monitored. If these indicators meet the expected targets, the optimization of the modified fluid vibration device can be considered complete.

[0069] In actual production, there may be some deviations. If the material discharge rate does not meet the expected requirements, the position and vibration intensity of the vibration device can be further adjusted. If blockage is prone to occur during the unloading process, the fluid shape can be adjusted to a cone or double cone to improve material flowability.

[0070] It will be understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A control method for a silo system with a modified fluid vibrator, characterized in that, The silo system with the modified fluid vibrator includes a silo, a modified fluid vibrator, a monitoring device, and a data processing device; The modified fluid vibrator includes a modified fluid and a vibrator. The vibrator is located at the center of the top of the silo, and the modified fluid is located on the central axis inside the silo. The vibrator is connected to the modified fluid through a telescopic rod and an excitation spring that are coaxially arranged with the silo, enabling the modified fluid to perform simple harmonic motion. The telescopic rod is used to adjust the height of the modified fluid. The controller of the vibrator is connected to the data processing device; The surface of the modified fluid is equipped with a pressure sensor, which is connected to the data processing device; The monitoring device is located at the bottom of the silo and is used to monitor the material flow status and discharge rate in the silo in real time, and transmit the data to the data processing device. The modified fluid has a spherical structure. The relationship between the modified fluid's diameter, height, vibration amplitude, angular velocity ω, and the silo's discharge rate is determined by the following model: In the formula, Q is the feed rate of the fluid after vibration is applied, in g / s; Q0 is the feed rate of the fluid without vibration, in g / s; k and c are fitting coefficients, respectively; and Froude number. g is the acceleration due to gravity; Among them, h i The height is the distance from the bottom of the fluid to the silo outlet, measured in mm; A is the vibration amplitude, measured in mm; D is the silo outlet diameter, measured in mm; d is the material particle diameter, measured in mm; d i The diameter of the fluid; The data processing device calculates Fr corresponding to a specific feed rate based on the relational model. * By adjusting Fr * The value is used to control the silo discharge rate; The control method includes unloading control, which optimizes and adjusts the height of a selected fluid to meet a set unloading rate target, and includes the following steps: S101. Measure material parameters, including particle size and density; S102. After the silo is filled with material, adjust the fluid to the initial height, start the vibrator and start it in sequence with the first set and the second set of operating parameters to unload the material. The monitoring device calculates the discharge rate Q1 and Q2 of the silo outlet under the two sets of operating parameters. The data processing device calculates Fr corresponding to the two discharge rates based on the operating parameters and the material parameters obtained in S101. * value Fr1 * Fr2 * Based on Fr1 * Fr2 * Q1 and Q2 obtain the values ​​of the two fitting parameters k and c, and then, based on the set target feeding rate Q... t1 The values ​​of the fitting parameters are calculated to obtain the corresponding Fr. * value Fr t1 * Then, by combining the diameter of the modified fluid and the diameter of the silo outlet, the height of the modified fluid under the actual operating parameters of the vibrator is calculated, thus obtaining the optimized height value; the operating parameters include vibration amplitude and vibration frequency. S103. By extending and retracting the telescopic rod, the height of the fluid reaches the optimized height value.

2. The control method according to claim 1, characterized in that, The bottom of the silo is made of transparent material.

3. The control method according to claim 1, characterized in that, In step S102, when the actual operating parameters of the vibrator change, the data processing device recalculates the corresponding fluid height and transmits it to the controller of the telescopic rod, which adjusts the length of the telescopic rod to make the fluid height reach the optimized value again.

4. The control method according to claim 1, characterized in that, Step S102 also includes: When the actual height of the fluid changes according to the operating conditions, the data processing device automatically calculates and re-reaches Fr. t * The corresponding operating parameters of the vibrator are transmitted to the vibrator controller to adjust the vibration amplitude and frequency.

5. The control method according to claim 1, characterized in that, The monitoring device obtains the discharge rate of the silo outlet by calculating the ratio of the measured mass of material flowing out of the silo outlet to the time.

6. The control method according to claim 1, characterized in that, The control method further includes optimizing the operating parameters of the modified fluid and the vibrator, selecting the optimized modified fluid for unloading under optimized operating parameters, so that the system achieves optimal energy consumption while meeting the unloading rate requirements, including the following steps: S201. Obtain the discharge rate Q0 of the fluid without applied vibration, and increase the discharge rate Q using unit energy consumption. E To assess the economics of energy consumption, Q E = (Q-Q0) / W, where W is the total energy consumption of the unloading process, which is calculated based on the pressure distribution and displacement detected by the pressure sensor; S202. Calculate Q corresponding to multiple sets of different modified fluid diameters and heights. E , obtain Q E With Fr * Relationship diagram, determine Q based on the relationship diagram. E Fr at peak value * value Fr t2 * ; S203. Preset a modified fluid diameter, combined with the set target discharge rate Q. t2 The fluid height is determined from the selectable range based on the aforementioned relationship model; then, the vibration amplitude and frequency of the vibrator are continuously adjusted to determine Fr. * Value and Fr t2 * If the error meets the requirements, update the preset fluid diameter and repeat S203; if it meets the requirements, complete the parameter optimization.

7. The control method according to claim 6, characterized in that, In step S203, the initial value of the modified fluid diameter is set to be the smallest, and it gradually increases in subsequent iterations.

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