CN-121997517-A - Vibrating screen elastic suspension damping system and dynamic parameter analysis method thereof

CN121997517ACN 121997517 ACN121997517 ACN 121997517ACN-121997517-A

Abstract

The application belongs to the technical field of vibration damping of a vibrating screen, and particularly relates to an elastic suspension damping system of the vibrating screen and a dynamic parameter analysis method thereof; the elastic suspension damping mechanism is connected between the whole screen vibration-taking component and the whole screen base in a suspension manner, and comprises a supporting spring and a damper. The system of the application introduces the damping element into the elastic suspension damping system, and the original single linear element or single nonlinear element is added into the composite element formed by combining the elastic element and the damping element due to the addition of the damper, thereby greatly improving the vibration reduction effect.

Inventors

GAO YUAN
WANG ZHOUQIONG
LIAO FEILONG
YUAN TAO
WANG WENQUAN
WANG HAO
YE JIAJIE
PENG YUANCHUN
ZHOU YONGLIN
CAI KETAO

Assignees

中国石油天然气集团有限公司
中国石油集团川庆钻探工程有限公司

Dates

Publication Date: 20260508
Application Date: 20241105

Claims (11)

1. The elastic suspension damping system of the vibrating screen is characterized by comprising a whole screen vibration-taking component, an elastic suspension damping mechanism and a whole screen base, wherein the elastic suspension damping mechanism is connected between the whole screen vibration-taking component and the whole screen base in a suspension manner, and the elastic suspension damping mechanism comprises a supporting spring and a damper.
2. The elastic suspension damping system of the vibrating screen according to claim 1, wherein the supporting springs comprise a first supporting spring and a second supporting spring, the second supporting spring and the damper are connected in series and are connected in parallel with the first supporting spring, one end of the damper after being connected in series is connected with the vibration-taking part of the vibrating screen, the other end of the damper is connected with one end of the second supporting spring, the other end of the second supporting spring is connected with the base of the vibrating screen, and two ends of the first supporting spring are respectively connected with the vibration-taking part of the vibrating screen and the base of the vibrating screen.
3. A dynamic parameter analysis method of an elastic suspension damping system of a vibrating screen is characterized by comprising the following steps, S1, acquiring system parameters of an elastic suspension damping system of a vibrating screen, and carrying out stress analysis on the system parameters; S2, constructing a dynamic equation of the whole screen vibration-reference component based on stress analysis; and S3, solving the constructed kinetic equation by using a mechanical impedance method, and further constructing a force transmission coefficient equation.
4. A dynamic parameter analysis method of a vibrating screen elastic suspension damping system according to claim 3, wherein in said step S1, the system parameters comprise mass m and frequency ratio of the whole screen vibration-reference member Relative damping coefficient Spring rate ratio Wherein ω is the excitation angular frequency, p is the natural frequency of the vibration-reference component, For the relative damping coefficient, γ is the frequency ratio, k is the stiffness coefficient of the first support spring, and k 1 is the stiffness coefficient of the second support spring.
5. The method for analyzing dynamic parameters of an elastic suspension damping system of a vibrating screen according to claim 4, wherein said step S2 is specifically: S21, constructing a dynamic vibration equation of the whole screen vibration-taking component based on stress analysis: in the formula, For the vibration acceleration of the vibrating screen, For the vibration acceleration of the whole sieve vibration-taking part with the mass of m, The vibration speed of the joint of the damper and the second supporting spring is F, the exciting force is F, t is time, and x is the vibration speed of the whole screen component with the mass of m; S22, when stress analysis is carried out, the damping force of the damper is equal to the elastic force of the second supporting spring so as to determine the structural design parameters of the vibration-taking component of the whole screen; step S23, based on the steps S21-S22, a kinetic equation is constructed: in the formula, The vibration of the vibrating screen is accelerated.
6. The method for analyzing dynamic parameters of an elastic suspension damping system of a vibrating screen as set forth in claim 5, wherein the damping force of the damper is The elastic force of the second supporting spring is k 1 x 1 , X 1 is the vibrational displacement of the second support spring.
7. The method for analyzing dynamic parameters of an elastic suspension damping system of a vibrating screen according to claim 5, wherein said step S3 is specifically: Step S31, in the vibration analysis process, the simple harmonic function of the kinetic equation is expressed by an exponential function, so that the following steps are obtained: Where K is the first spring rate expressed as an exponential function, K 1 is the second spring rate expressed as an exponential function, j is a complex symbol, For the complex displacement of the whole sieve vibration-taking part with the mass of m, The complex displacement of the connection part of the damper and the second supporting spring is represented by F, and the exciting force is represented by F; Step S32, pair Solving by Cramer's method to obtain The method comprises the following steps of: Wherein θ and θ 1 are intermediate parameters, and Step S33 based on Determining a force F Π ＝Kx+K 1 x 1 transmitted to the screen base, wherein K 1 is a second support spring rate expressed as an exponential function; Step S34, determining a force transfer coefficient equation according to the complex amplitude of the F Π ＝Kx+K 1 x 1 :
8. The method for analyzing dynamic parameters of a vibrating screen elastic suspension damping system according to claim 7, wherein in step S31, when represented by an exponential function, the method is characterized in that the method comprises the following steps of And Substituting Fe jωt , And And simplifying and eliminating e jωt to obtain the following steps: where e jωt denotes an exponential function.
9. The method for analyzing dynamic parameters of an elastic suspension damping system of a vibrating screen as recited in claim 7, wherein in step S32, the method is characterized by solving by Cramer' S law The method comprises the following steps: Substituting system parameters The following is obtained: The method comprises the following steps of: in the formula, Where J represents the imaginary part of the complex number.
10. The method for analyzing dynamic parameters of an elastic suspension damping system of a vibrating screen according to claim 9, wherein the steady state response of the vibrating screen is expressed as x= Xsin (ωt- θ), x 1 ＝X 1 sin(ωt-θ 1 , because the disturbance forces are simple harmonic functions; The ratio of the amplitude of the transmission force to the amplitude of the acting force is the transmission coefficient K pi.
11. The method for analyzing dynamic parameters of a vibrating screen elastic suspension damping system according to claim 10, wherein in step S24, complex amplitudes of x (t) and x1 (t) are represented by It was determined that the complex amplitude of F Π was obtained from the result of vector synthesis as: in the formula, And then the equation of the transmission coefficient of the force is obtained as follows:

Description

Vibrating screen elastic suspension damping system and dynamic parameter analysis method thereof Technical Field The application belongs to the technical field of vibration damping of a vibrating screen, and particularly relates to an elastic suspension damping system of the vibrating screen and a dynamic parameter analysis method of the elastic suspension damping system. Background In the current mass inertial vibration sieves widely used in petroleum drilling vibration sieves, single steel coil springs, rubber springs and rubber compound springs are adopted in many cases. For example, patent publication No. CN209476646U, chinese patent entitled "eccentric Block Assembly with Adjustable eccentricity, vibration exciter and vibration Screen", discloses that the eccentric Block Assembly with Adjustable eccentricity comprises a first eccentric Block, a second eccentric Block and a drive mechanism, the weight ratio of the first eccentric Block to the second eccentric Block ranges from 0.8 to 1.2, the drive mechanism comprises an arc-shaped groove and a pin, the arc-shaped groove has a first end and a second end opposite to the first end, the pin has a relatively maximum eccentricity when located at the first end, and the pin has a relatively minimum eccentricity when located at the second end. The vibration exciter comprises an eccentric block component with adjustable eccentricity. The vibrating screen comprises a vibration exciter. The vibration reduction effect of the springs is obvious when the vibration excitation rotating speed (vibration excitation frequency) is low. However, when the excitation frequency is increased, and the frequency ratio of the excitation frequency to the natural frequency of the vibration-reference component is further increased, the vibration-damping effect is greatly reduced, and the process requirements of production and development are difficult to adapt. Disclosure of Invention The invention provides an elastic suspension damping system of a vibrating screen and a dynamic parameter analysis method thereof, which aim to solve the problems that when the existing vibrating screen works with a large frequency ratio, the vibration damping effect of a vibration damping structure is greatly reduced and the process requirements of production development are difficult to adapt. In order to achieve the technical effects, the technical scheme of the application is as follows: The elastic suspension damping system of the vibrating screen comprises a whole screen vibration-taking component, an elastic suspension damping mechanism and a whole screen base, wherein the elastic suspension damping mechanism is connected between the whole screen vibration-taking component and the whole screen base in a suspension mode, and the elastic suspension damping mechanism comprises a supporting spring and a damper. The support springs comprise a first support spring and a second support spring, wherein the second support spring and the damper are connected in series and are connected with the first support spring in parallel, one end of the damper after being connected in series is connected with the vibration-taking part of the whole screen, the other end of the damper is connected with one end of the second support spring, the other end of the second support spring is connected with the whole screen base, and two ends of the first support spring are respectively connected with the vibration-taking part of the screen and the whole screen base. A dynamic parameter analysis method of a vibrating screen elastic suspension damping system realizes dynamic parameter analysis by constructing a force transmission coefficient equation, and comprises the following steps: s1, acquiring system parameters of an elastic suspension damping system of a vibrating screen, and carrying out stress analysis on the system parameters; S2, constructing a dynamic equation of the whole screen vibration-reference component based on stress analysis; and S3, solving the constructed kinetic equation by using a mechanical impedance method, and further constructing a force transmission coefficient equation. Further, in the step S1, the system parameters include the mass m and the frequency ratio of the whole screen vibrating componentRelative damping coefficientSpring rate ratioWherein ω is the excitation angular frequency, p is the natural frequency of the vibration-reference component,For the relative damping coefficient, γ is the frequency ratio, k is the stiffness coefficient of the first support spring, and k 1 is the stiffness coefficient of the second support spring. Further, the step S2 specifically includes: S21, constructing a dynamic vibration equation of the whole screen vibration-taking component based on stress analysis: in the formula, For the vibration acceleration of the vibrating screen,For the vibration acceleration of the whole sieve vibration-taking part with the mass of m,The vibration speed of the joint of the d