CN116371717B - Multi-degree-of-freedom large-deflection elastic vibration screening system and regulation and control method - Google Patents
Multi-degree-of-freedom large-deflection elastic vibration screening system and regulation and control method Download PDFInfo
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- 238000012216 screening Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000004458 analytical method Methods 0.000 claims abstract description 57
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- 229910000831 Steel Inorganic materials 0.000 claims description 19
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- 238000010008 shearing Methods 0.000 claims description 10
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The application provides a multi-degree-of-freedom large-deflection elastic vibration screening system and a regulating and controlling method, wherein the system comprises a multi-degree-of-freedom large-deflection elastic vibration screen, screen surface dynamics analysis equipment, high-speed camera analysis equipment and system dynamics parameter regulating equipment, the screen surface dynamics analysis equipment automatically monitors the amplitude of an elastic screen surface, the high-speed camera analysis equipment automatically captures the motion track of feeding groups of each section of screen surface, and the system dynamics parameter regulating equipment regulates and controls the parameters of a vibration screen part according to the calculation result of a dynamic model of the multi-degree-of-freedom large-deflection elastic vibration screening system and can regulate the number of exciting balls. Aiming at various material groups, the application realizes the equal thickness screening effect of the material groups along the whole screen surface by means of the screen surface dynamics analysis equipment and the high-speed camera shooting analysis equipment and the system dynamics parameter adjustment equipment and changes the distribution state of the material groups on the screen by adjusting the amplitude of the screen surface, thereby achieving the optimal screening efficiency.
Description
Technical Field
The application belongs to the technical field of screening, and particularly relates to a multi-degree-of-freedom large-deflection elastic vibration screening system and a regulating and controlling method.
Background
The vibration relaxation sieve mainly comprises a main sieve frame and a floating sieve frame, wherein the main sieve frame and the floating sieve frame do opposite or opposite reciprocating motion under the action of a vibration exciter, and the dynamic characteristics of the vibration relaxation sieve directly influence the motion rule of a sieve surface arranged on a beam of the main floating sieve frame, the activity degree of materials on the sieve surface and the sieving effect. At present, the inclination angle, the amplitude and the vibration intensity of each section of screen surface of a common vibrating screen are consistent along the direction of the screen surface, so that the phenomena of material group accumulation, uneven distribution of materials on the screen and the like are easy to occur at a feeding end, the dynamic stability of a system in the screening process is greatly influenced, and key components such as a shear spring, the screen surface and the like are easy to damage.
The structure form of traditional isopachous screen is borrowed, adopt multistage broken line form to arrange the main frame that floats of vibration relaxation screen for the contained angle of screening surface and horizontal plane is progressively decreased in proper order by pan feeding end to discharge end, with the motion orbit and the speed of change material in different positions, make the material keep thickness along screening surface length direction unanimous, and then improve the effective utilization ratio of screening surface, but this kind of screen machine that realizes isopachous screening through changing the inclination form of screening surface is complicated in design, the height is great, and each section screening surface inclination is fixed relatively, and the amplitude can not be adjusted by sections, is difficult to satisfy the production requirement of modernized coal preparation factory high-efficient intensification.
Disclosure of Invention
Aiming at the existing problems, the application provides a multi-degree-of-freedom large-deflection elastic vibration screening system and a regulating method based on the theory of multi-degree-of-freedom system dynamics and the multi-frequency excitation elastic screening technology, and the parameters of a vibrating screen component are regulated by utilizing the influence rule of the synergistic effect of all the parameters of the system on the screening effect.
The application aims to provide a multi-degree-of-freedom large-deflection elastic vibration screening system and a regulating and controlling method, and has the advantage that the amplitude of a screening surface can be regulated by regulating various components on a vibrating screen.
In order to achieve the above purpose, the application adopts the following technical scheme: the multi-degree-of-freedom large-deflection elastic vibration screening system is characterized by comprising a multi-degree-of-freedom large-deflection elastic vibration screen, screen surface dynamics analysis equipment, high-speed shooting analysis equipment and system dynamics adjustment equipment;
the multi-freedom-degree large-deflection elastic vibrating screen comprises a screen box, a supporting frame, a vibration excitation device, supporting springs and vibration excitation balls, wherein the screen box comprises a main screen frame and a floating screen frame, the main screen frame comprises two upper ends of which are provided with vibration excitation beams, the lower ends of which are provided with symmetrical side plates of bearing beams, the driving beams are fixed on the side plates, the floating screen frame is assembled by a plurality of independent floating beams and connected with the side plates through connecting plates, shearing springs are arranged on the outer sides of the side plates, a screen surface is arranged between the adjacent driving beams and the floating beams, a fixing frame is arranged below the screen surface and comprises steel plates, longitudinal steel bars and transverse steel bars, each fixing beam and each floating beam are welded with the steel plates, the longitudinal steel bars protrude below the steel plates, the transverse steel bars are fixed on the longitudinal steel bars, the vibration excitation balls are arranged in the fixing frame, the vibration excitation device comprises a motor and a vibration exciter, the vibration exciter is arranged on the vibration excitation beam, the motor is arranged on the motor base, the motor is connected with the vibration exciter by wires, the screen box is connected with the supporting frame through the supporting springs, and the supporting frame is arranged on the ground;
the screen surface dynamics analysis equipment consists of an acceleration sensor, an acquisition instrument and an analysis computer, wherein the acceleration sensor is arranged on each section of screen surface of the multi-degree-of-freedom large-deflection elastic vibrating screen, the acceleration sensor is connected with the acquisition instrument through a data transmission line, the acquisition instrument transmits acceleration data of the screen surface to the analysis computer through the data transmission line, the analysis computer analyzes and processes data, and the adjustment result of the system dynamics parameter adjustment equipment is verified;
the high-speed camera shooting analysis equipment consists of a high-speed camera and an image analysis computer, the high-speed camera is connected with the image analysis computer through a data transmission line, the high-speed camera is opposite to one side of the main screen frame, the movement speed and the spatial distribution of particles in a feeding group on the screen surface are observed, the image analysis computer analyzes and calculates the distribution state of the particles, and an analysis result is transmitted to the system dynamics parameter adjustment equipment;
the system dynamics adjusting device is a computer provided with a multi-degree-of-freedom system dynamics model code, the average material height is determined according to the analysis result of the high-speed camera shooting analysis device, when the material of the screen surface is higher or lower than the average material height, the computer automatically reduces or increases the relevant parameters of the multi-degree-of-freedom system dynamics model, wherein the relevant parameters comprise the rigidity and damping of a shearing spring adjacent to the screen surface and the mass of a floating beam connected with the screen surface, meanwhile, vibration balls are added to assist vibration screening according to a multi-frequency excitation theory, the amplitude of the screen surface is changed, the calculation result of the multi-degree-of-freedom system dynamics model is verified based on acceleration data newly collected by an acceleration sensor, and uniform thickness screening is finally realized.
Preferably, the multiple degree of freedom system dynamics model is designed as follows:
wherein M is mass, M 0 Is the mass of the main screen frame, m n is the mass of the nth floating screen frame, the value of n is the number of floating beams arranged on the vibrating screen, C is damping, and C 0 For supporting springsDamping, c n C is the total damping of the shear springs on the nth floating frame n ' is the total damping of the screening surface on the nth floating screen frame, K is the rigidity, K 0 To support the stiffness of the spring, k n Is the total stiffness, k, of the shear springs on the nth floating frame n ' is the total rigidity of the screening surface on the nth floating screen frame, X is displacement, and X 0 Is the displacement of the main screen frame, x n The displacement of the nth floating screen frame is represented by F, F is the exciting force of the motor, ω is the motor frequency, and t is the time.
The application also provides a regulating and controlling method applied to the multi-degree-of-freedom large-deflection elastic vibration screening system, which comprises the following steps:
step one, establishing a vibration sieve multi-degree-of-freedom system dynamics model based on a multi-degree-of-freedom system dynamics theory, and programming the model in a computer;
step two, starting an excitation device and adjusting excitation frequency, enabling the main screen frame and the floating screen frame to do relative motion, enabling the screen surface to do relaxation motion, enabling the material group to contact with the screen surface from the storage bin through the material inlet, and performing screening operation;
thirdly, observing the distribution condition of the feeding groups of the screen surface through a high-speed camera, and analyzing and processing the image by using an image analysis computer to obtain the spatial positions of the feeding groups of the screen surface of each section;
and fourthly, determining the average material height according to the analysis result of the high-speed photographing analysis equipment, automatically reducing or increasing the rigidity of each section of shearing spring and the mass of the floating screen frame by a computer when the material on the screen surface is higher or lower than the average material height, adding one to three excitation balls under the screen surface higher than the average material height according to the degree higher than the screen surface, changing the amplitude of the screen surface, verifying the calculation result of the multi-degree-of-freedom system dynamics model based on the acceleration data newly collected by the acceleration sensor, and finally realizing equal-thickness screening.
Compared with the prior art, the application establishes a vibrating screen multi-degree-of-freedom system dynamics model based on multi-degree-of-freedom system dynamics theory and a multi-frequency excitation elastic screening technology, and automatically detects real-time vibration amplitude of a screen surface through screen surface dynamics analysis equipment and real-time movement track of screened particles on the screen through high-speed camera shooting analysis equipment; and transmitting the detection data to analysis equipment for analysis, substituting the result into a vibration sieve quality multi-degree-of-freedom system dynamics model, and adjusting parameters of a vibration sieve component through a computer calculation result to realize uniform thickness screening of screening particles on the vibration sieve along the whole screen surface. The application automatically monitors data, has simple adjustment mode and ideal screening condition.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a multi-degree-of-freedom large-deflection elastic vibration screening system and a regulating method.
Fig. 2 is a schematic view of a fixing frame and an excitation ball.
Fig. 3 is a schematic diagram of a multiple degree of freedom system dynamics model of a vibrating screen body, a screen surface and a material group coupling system according to the present application.
Icon: 1 a multi-degree-of-freedom large-deflection elastic vibrating screen; 1-1 screen box; 1-1-1 main screen frame; 1-1-2 floating screen frames; 1-1-3 screen surfaces; 1-2 shearing springs; 1-3 supporting springs; 1-4 supporting frames; 1-5 fixing frames; 1-6 excitation balls; 1-7 vibration excitation devices; 2-1 high speed camera; 2-2 an image analysis computer; 2-3 acceleration sensor; 2-4 acquisition instrument; 2-5 analysis computer; 2-6 computers.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic diagram of a multi-degree-of-freedom large-deflection elastic vibration screening system according to an embodiment of the application, and fig. 2 is a schematic diagram of a fixed frame and an excitation ball.
The key of the multi-degree-of-freedom large-deflection elastic vibration screening system is as follows: a multi-degree-of-freedom large-deflection elastic vibrating screen is characterized in that a multi-degree-of-freedom system dynamics model of the large-deflection elastic vibrating screen is established, and uniform thickness screening is realized by screen surface dynamics analysis equipment, high-speed camera shooting analysis equipment and system dynamics parameter adjustment equipment.
The multi-degree-of-freedom large-deflection elastic vibrating screen 1 comprises a screen box 1-1, a supporting frame 1-4, a vibration excitation device 1-7, supporting springs 1-3 and vibration excitation balls 1-6, wherein the screen box 1-1 comprises a main screen frame 1-1-1 and a floating screen frame 1-1-2, the main screen frame 1-1 comprises two upper ends provided with vibration excitation beams, the lower end of the main screen frame 1-1 is provided with symmetrical side plates of bearing beams, the driving beams are fixed on the side plates, the floating screen frame 1-1-2 is assembled by a plurality of independent floating beams and connected with the side plates through connecting plates, a shearing spring 1-2 is arranged outside the side plates, a screen surface 1-1-3 is arranged between the adjacent driving beams and the floating beams, a fixed frame 1-5 is arranged below the screen surface, the fixed frame comprises a steel plate, a longitudinal steel bar and a transverse steel bar, the vibration excitation balls 1-6 are arranged in the fixed on the fixed frame, the vibration excitation device 1-7 comprises a motor and a vibration exciter, the motor is arranged on the vibration excitation beam, the motor is connected with the supporting frame 1-4 through the supporting springs, and the vibration excitation device is connected with the ground through the supporting frame 1-3.
The screen surface dynamics analysis equipment is composed of acceleration sensors 2-3, an acquisition instrument 2-4 and an analysis computer 2-5, wherein the acceleration sensors 2-3 are installed on each section of screen surface 1-1-3 of the multi-degree-of-freedom large-deflection elastic vibrating screen 1, the number of the acceleration sensors 2-3 installed on the screen surface 1-1-3 is determined according to the number of the sections of the screen surface 1-1-3, one acceleration sensor 2-3 is installed in the middle section of each section of the screen surface 1-1-3, the acceleration sensors 2-3 are connected with the acquisition instrument 2-4 through a data transmission line, the acquisition instrument 2-4 transmits screen surface acceleration data to the analysis computer 2-5 through the data transmission line, and the analysis computer 2-5 performs data analysis processing to verify the adjustment result of the system dynamics parameter adjustment equipment.
The high-speed camera shooting analysis equipment consists of a high-speed camera 2-1 and an image analysis computer 2-2, wherein the high-speed camera 2-1 is connected with the image analysis computer 2-2 through a data transmission line, the high-speed camera 2-1 is opposite to one side of a main screen frame, the movement speed and the spatial distribution of particles in a feeding group of a screen surface are observed, the image analysis computer 2-2 analyzes and calculates the distribution state of the particles, and an analysis result is transmitted to the system dynamics parameter adjustment equipment.
Referring to fig. 3, fig. 3 is a schematic diagram of a multiple degree of freedom system dynamics model of a vibrating screen body, a screen surface and a material group coupling system provided by the application, the system dynamics adjusting device is a computer 2-6 provided with multiple degree of freedom system dynamics model codes, the average material height is determined according to the analysis result of a high-speed camera analysis device, when the material of the screen surface 1-1-3 is higher or lower than the average material height, the computer 2-6 automatically reduces or increases the relevant parameters of the multiple degree of freedom system dynamics model, wherein the relevant parameters comprise the rigidity and damping of a shear spring 1-2 related to the screen surface 1-1-3 and the mass of a floating screen frame 1-1-2 connected with the screen surface 1-1-3, meanwhile, the vibration screen is assisted by adding an excitation ball 1-6 according to a multiple frequency excitation theory, the amplitude of the screen surface 1-1-3 is changed, and the calculation result of the system dynamics model is verified based on the acceleration data newly collected by an acceleration sensor 2-3, so that uniform thickness screening is finally realized.
Specifically, the multiple degree of freedom system dynamics model is designed as follows:
wherein M is mass, M 0 Is the mass of the main screen frame 1-1-1, m n The n-th floating screen frame 1-1-2 is the mass, the n value is the number of the floating screen frames installed on the vibrating screen, C is damping, and C 0 C for damping the support springs 1-3 n Is the total damping of the shear springs 1-2 on the nth floating frame 1-1-2, c n ' is the total damping of the screening surface 1-1-3 on the nth floating screen frame, K is the stiffness, K 0 To support the stiffness of the springs 1-3, k n Is the total rigidity, k, of the shear springs 1-2 on the nth floating screen frame 1-1-2 n ' is the total rigidity of the screening surface 1-1-3 on the nth floating screen frame 1-1-2, X is displacement, X 0 Is the displacement of the main screen frame 1-1-1, x n The n-th floating screen frame 1-1-2 is displaced, F is exciting force, F is motor exciting force, omega is motor frequency, t is time, and the multi-degree-of-freedom model can be flexibly adjusted according to the number of the actual vibrating screen floating screen frames 1-1-2 and the shearing springs 1-2.
The application also provides a regulating and controlling method applied to the multi-degree-of-freedom large-deflection elastic vibration screening system, which comprises the following steps:
step one, a multi-degree-of-freedom system dynamics model of the vibrating screen is established based on a multi-degree-of-freedom system dynamics theory, and the model is programmed in a computer 2-6.
Step two, starting the vibration excitation device 1-7 and adjusting the vibration excitation frequency, enabling the main screen frame 1-1 and the floating screen frame 1-1-2 to do relative motion, enabling the screen surface 1-1-3 to do relaxation motion, enabling the material group to contact with the screen surface 1-1-3 from the storage bin through the material inlet, and performing screening operation.
And thirdly, observing the distribution condition of the feeding groups of the screen surface 1-1-3 through a high-speed camera 2-1, and analyzing and processing the image by using an image analysis computer 2-2 to obtain the spatial position of the feeding groups of the screen surface 1-1-3 of each section.
And fourthly, determining the average material height according to the analysis result of the high-speed photographing analysis equipment, automatically reducing or increasing the rigidity of each section of shearing spring 1-2 and the mass of the floating screen frame 1-1-2 by a computer when the material of the screen surface 1-1-3 is higher or lower than the average material height, adding one to three excitation balls 1-6 according to the higher degree under the screen surface 1-1-3 higher than the average material height, changing the amplitude of the screen surface 1-1-3, and verifying the calculation result of the multi-degree-of-freedom system dynamics model based on the acceleration data newly acquired by the acceleration sensor 2-3, thereby finally realizing uniform thickness screening.
In the screening process, a motor is started, a material group enters a screening box to carry out screening operation, at the moment, a high-speed camera 2-1 observes the distribution state of the material groups of a screening surface 1-1-3, an image analysis computer 2-1 analyzes the observation result of the high-speed camera 2-1, determines the average height of the material group and whether the feeding group of each section of the screening surface 1-1-3 is higher or lower than the average height of the material group, and transmits the result into the computer, the computer again observes and verifies the calculation result according to the analysis result of the image analysis computer 2, the damping and rigidity of the related shear spring 1-2 and the mass of the floating screen frame 1-1-2 are reduced or increased by the screening surface 1-1-3 which is higher or lower than the average height of the material group, the computer calculates the amplitude of each section of the screening surface 1-1-3 after parameter adjustment, the computer adjusts the component parameter of the vibration screen according to the component after the computer adjustment, and adds the vibration exciting ball 1-6 to assist the screening process, and the screen surface dynamics analysis equipment verifies the calculation result, and the high-speed camera 2-1 again observes and verifies the adjustment result, finally, the thickness of the vibration screen is realized, and the screen is realized.
Therefore, the application can automatically monitor the vibration amplitude of the elastic screen surface through the screen surface dynamics analysis equipment, the high-speed camera shooting analysis equipment automatically captures the motion track of the feeding group of each section of screen surface, and the system dynamics parameter adjusting equipment adjusts and controls the parameters of the vibrating screen component according to the calculation result of the dynamics model of the multi-degree-of-freedom large-deflection elastic vibrating screen system. And in some cases, the distribution state of the feeding groups of the sieve can be adjusted by adjusting the number of the exciting balls. Aiming at each material group, by means of screen surface dynamics analysis equipment and high-speed camera shooting analysis equipment, system dynamics parameter adjustment equipment, the distribution state of the material groups on the screen is changed by adjusting the amplitude of the screen surface, the effect of uniform thickness screening of the material groups along the whole screen surface is achieved, and the optimal screening efficiency is achieved.
In summary, the embodiment of the application provides a multi-degree-of-freedom large-deflection elastic vibration screening system and a regulation method, wherein a multi-degree-of-freedom system dynamics model of a vibrating screen is established based on a multi-degree-of-freedom system dynamics theory and a multi-frequency excitation elastic screening technology, and real-time amplitude of a screen surface is automatically detected through screen surface dynamics analysis equipment, and real-time movement tracks of screened particles on the screen are automatically detected through high-speed camera shooting analysis equipment; and transmitting the detection data to analysis equipment for analysis, substituting the result into a vibration sieve quality multi-degree-of-freedom system dynamics model, and adjusting parameters of a vibration sieve component through a computer calculation result to realize uniform thickness screening of screening particles on the vibration sieve along the whole screen surface. The application automatically monitors data, has simple adjustment mode and ideal screening condition.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (3)
1. The multi-degree-of-freedom large-deflection elastic vibration screening system is characterized by comprising a multi-degree-of-freedom large-deflection elastic vibration screen, screen surface dynamics analysis equipment, high-speed shooting analysis equipment and system dynamics adjustment equipment;
the multi-freedom-degree large-deflection elastic vibrating screen comprises a screen box, a supporting frame, a vibration excitation device, supporting springs and vibration excitation balls, wherein the screen box comprises a main screen frame and a floating screen frame, the main screen frame comprises two upper ends of which are provided with vibration excitation beams, the lower ends of which are provided with symmetrical side plates of bearing beams, the driving beams are fixed on the side plates, the floating screen frame is assembled by a plurality of independent floating beams and connected with the side plates through connecting plates, shearing springs are arranged on the outer sides of the side plates, a screen surface is arranged between the adjacent driving beams and the floating beams, a fixing frame is arranged below the screen surface and comprises steel plates, longitudinal steel bars and transverse steel bars, each fixing beam and each floating beam are welded with the steel plates, the longitudinal steel bars protrude below the steel plates, the transverse steel bars are fixed on the longitudinal steel bars, the vibration excitation balls are arranged in the fixing frame, the vibration excitation device comprises a motor and a vibration exciter, the vibration exciter is arranged on the vibration excitation beam, the motor is arranged on the motor base, the motor is connected with the vibration exciter by wires, the screen box is connected with the supporting frame through the supporting springs, and the supporting frame is arranged on the ground;
the screen surface dynamics analysis equipment consists of an acceleration sensor, an acquisition instrument and an analysis computer, wherein the acceleration sensor is arranged on each section of screen surface of the multi-degree-of-freedom large-deflection elastic vibrating screen, the acceleration sensor is connected with the acquisition instrument through a data transmission line, the acquisition instrument transmits acceleration data of the screen surface to the analysis computer through the data transmission line, the analysis computer analyzes and processes data, and the adjustment result of the system dynamics parameter adjustment equipment is verified;
the high-speed camera shooting analysis equipment consists of a high-speed camera and an image analysis computer, the high-speed camera is connected with the image analysis computer through a data transmission line, the high-speed camera is opposite to one side of the main screen frame, the movement speed and the spatial distribution of particles in a feeding group on the screen surface are observed, the image analysis computer analyzes and calculates the distribution state of the particles, and an analysis result is transmitted to the system dynamics parameter adjustment equipment;
the system dynamics adjusting device is a computer provided with a multi-degree-of-freedom system dynamics model code, the average material height is determined according to the analysis result of the high-speed camera shooting analysis device, when the material of the screen surface is higher or lower than the average material height, the computer automatically reduces or increases the relevant parameters of the multi-degree-of-freedom system dynamics model, wherein the relevant parameters comprise the rigidity and damping of a shearing spring adjacent to the screen surface and the mass of a floating beam connected with the screen surface, meanwhile, vibration balls are added to assist vibration screening according to a multi-frequency excitation theory, the amplitude of the screen surface is changed, the calculation result of the multi-degree-of-freedom system dynamics model is verified based on acceleration data newly collected by an acceleration sensor, and uniform thickness screening is finally realized.
2. The multiple degree of freedom high deflection elastic vibratory screening system of claim 1, the multiple degree of freedom system dynamics model designed to:
wherein M is mass, M 0 Is the mass of the main screen frame, m n The n is the mass of the nth floating screen frame, the n is the number of floating beams installed on the vibrating screen, C is damping, and C 0 C for damping the support spring n C is the total damping of the shear springs on the nth floating frame n ' is the total damping of the screening surface on the nth floating screen frame, K is the rigidity, K 0 To support the stiffness of the spring, k n Is the total stiffness, k, of the shear springs on the nth floating frame n ' is the total rigidity of the screening surface on the nth floating screen frame, X is displacement, and X 0 Is the displacement of the main screen frame, x n The displacement of the nth floating screen frame is represented by F, F is the exciting force of the motor, ω is the motor frequency, and t is the time.
3. A method for controlling a multi-degree-of-freedom high-deflection elastic vibration screening system according to any one of claims 1 to 2, comprising the steps of:
step one, establishing a vibration sieve multi-degree-of-freedom system dynamics model based on a multi-degree-of-freedom system dynamics theory, and programming the model in a computer;
step two, starting an excitation device and adjusting excitation frequency, enabling the main screen frame and the floating screen frame to do relative motion, enabling the screen surface to do relaxation motion, enabling the material group to contact with the screen surface from the storage bin through the material inlet, and performing screening operation;
thirdly, observing the distribution condition of the feeding groups of the screen surface through a high-speed camera, and analyzing and processing the image by using an image analysis computer to obtain the spatial positions of the feeding groups of the screen surface of each section;
and fourthly, determining the average material height according to the analysis result of the high-speed photographing analysis equipment, automatically reducing or increasing the rigidity of each section of shearing spring and the mass of the floating screen frame by a computer when the material on the screen surface is higher or lower than the average material height, adding one to three excitation balls under the screen surface higher than the average material height according to the degree higher than the screen surface, changing the amplitude of the screen surface, verifying the calculation result of the multi-degree-of-freedom system dynamics model based on the acceleration data newly collected by the acceleration sensor, and finally realizing equal-thickness screening.
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