CN103258089B - Contracting is than ball mill test research method - Google Patents

Abstract

The invention discloses a test and research method of a scaled ball mill, which comprises designing and manufacturing the scaled ball mill, establishing a three-dimensional finite element assembly model of the scaled ball mill, performing static and dynamic simulation of the scaled ball mill, formulating a test plan, and carrying out static and dynamic test research , Carry out comprehensive comparative analysis and test research report steps to realize the scaled ball mill test research; the present invention formulates a test plan based on the research results of numerical simulation, tests the structural stress, deformation and hydraulic system parameters of the ball mill; and compares and analyzes with the numerical simulation results, Find out the reasons for the errors in the two, and further improve the numerical analysis and testing work; verify the accuracy and reliability of the numerical analysis results; use the error analysis method to modify the analysis model and test methods until the requirements of engineering applications are met; the present invention provides The design ability and method of a large ball mill with low energy consumption and high reliability have been developed, and the cost of experimental research has been reduced. <!--1--><!--2-->

Description

Experimental Research Method of Scaled Ball Mill

technical field

The invention relates to an experimental research method, in particular to a scaled ball mill experimental research method.

Background technique

The specifications of ball mills working in heavy-load, low-speed and harsh environments are constantly increasing, which puts forward higher requirements for its processing capacity, reliability, service life, maintenance and energy consumption. For large-scale ball mills, there are no design standards and specifications abroad. At present, my country's ball mill industry has not yet mastered the design theory and core technology of ball mills. Large ball mills designed by empirical analogy have low operational reliability, frequent failures, high energy consumption and high maintenance costs. Therefore, it is urgent to overcome large ball mills. Design theoretical problems and key technologies in order to design large-scale ball mills with low energy consumption and high reliability as soon as possible, so as to improve my country's ability to independently design large-scale mills.

In order to obtain the design ability and method of a large ball mill with low energy consumption and high reliability, the experimental research of the ball mill is indispensable. In order to reduce the cost of the experimental research, according to the similar theory, it is economically feasible to use a scaled-down mill for experimental research .

Contents of the invention

The object of the present invention is to provide a kind of reduction ratio ball mill test research method. Based on the research results of numerical simulation, formulate a test plan to test the structural stress, deformation and hydraulic system parameters of the ball mill; and compare and analyze with the numerical simulation results to find out the reasons for the errors between the two, and further improve the numerical analysis and testing work. Verify the accuracy and reliability of numerical analysis results; use error analysis to modify analysis models and test methods until they meet the requirements of engineering applications.

The method of the present invention comprises the following steps

(1) Design and manufacture of a scaled ball mill: refer to a large ball mill, design and manufacture a scaled ball mill of a large ball mill according to the similar theory;

(2) Establish a three-dimensional finite element assembly model of a scaled ball mill: the contact nonlinearity between the hollow shaft and the bearing bush, the self-aligning bearing liner and the saddle seat is used as the boundary condition, and the constraint effect of the bearing on the rotating body is simulated. The spiral guide groove inside the hollow shaft, the corrugated liner inside the cylinder, and the liners in the left and right end covers are simulated with equivalent material density, and high-precision units are selected and reasonably divided. Simulate with the big gear with the shared node method;

(3) Static and dynamic simulation of scaled ball mill: including fluid dynamics model, friction heat generation model, determination of boundary conditions and analysis of simulation results; the working condition of static simulation is full load static, based on hollow shaft and bearing bush, self-aligning bearing bushing The simulation of the contact boundary conditions between the body and the saddle; the working conditions of the dynamic simulation are start-up and normal operation, based on the simulation of the fluid, solid and thermal multi-field coupling boundary conditions of the hydrostatic bearing;

(4) Formulate the test plan: including the selection of test instruments and equipment, the reasonable determination of the location and number of measuring points; according to the static simulation results of the scaled ball mill, determine the position and number of the static stress measuring points of the structure; according to the dynamic simulation of the scaled ball mill As a result, determine the location and number of structural dynamic stress measurement points; determine the location and number of hydrostatic bearing oil film pressure measurement points according to the results of multi-field coupling analysis of hydrostatic bearing fluid, solid, and heat;

(5) Conduct static and dynamic test research: According to the sequence of static test and then dynamic test research, according to the test plan, use wired test and wireless test methods to carry out test research until the test data is stable and repeated;

(6) Comprehensive comparative analysis: compare and analyze the numerical simulation results with the measured data of the scaled ball mill, and carefully analyze the reasons for the errors between the two. If the errors do not meet the requirements, modify the model and boundary conditions of the numerical simulation analysis until the numerical analysis Until the results are consistent with the measured data of the scaled ball mill; if the modified simulation results show a point that is too large compared with the corresponding parameters of the measuring point position, modify the test plan, and then carry out the corresponding experimental research;

(7) Test research report: including: static stress distribution law and dynamic stress change law of cylinder body, end cover, hollow shaft, self-aligning bearing liner and saddle contact surface; pressure and flow velocity distribution of hydrostatic bearing oil film law; the temperature change law of hydrostatic bearing oil film.

The beneficial effect of the present invention is to provide a design capability and method for a large ball mill with low energy consumption and high reliability, and reduce the cost of experimental research.

Description of drawings

Fig. 1 is a flow chart of the present invention.

Detailed ways

As shown in Fig. 1, the method of the present invention comprises the following steps

(1) Design and manufacture of a scaled ball mill: refer to a large ball mill, and according to the similar theory, design and manufacture a scaled ball mill of a large ball mill;

(2) Establish a three-dimensional finite element assembly model of a scaled ball mill: the contact nonlinearity between the hollow shaft and the bearing bush, the self-aligning bearing liner and the saddle seat is used as the boundary condition, and the constraint effect of the bearing on the rotating body is simulated. The spiral guide groove inside the hollow shaft, the corrugated liner inside the cylinder, and the liners in the left and right end covers are simulated with equivalent material density, and high-precision units are selected and reasonably divided. Simulate with the big gear with the shared node method;

(3) Static and dynamic simulation of scaled ball mill: including fluid dynamics model, friction heat generation model, determination of boundary conditions and analysis of simulation results; the working condition of static simulation is full load static, based on hollow shaft and bearing bush, self-aligning bearing bushing The simulation of the contact boundary conditions between the body and the saddle; the working conditions of the dynamic simulation are start-up and normal operation, based on the simulation of the fluid, solid and thermal multi-field coupling boundary conditions of the hydrostatic bearing;

(4) Formulate the test plan: including the selection of test instruments and equipment, the reasonable determination of the location and number of measuring points; according to the static simulation results of the scaled ball mill, determine the position and number of the static stress measuring points of the structure; according to the dynamic simulation of the scaled ball mill As a result, determine the location and number of structural dynamic stress measurement points; determine the location and number of hydrostatic bearing oil film pressure measurement points according to the results of multi-field coupling analysis of hydrostatic bearing fluid, solid, and heat;

(5) Conduct static and dynamic test research: According to the sequence of static test and then dynamic test research, according to the test plan, use wired test and wireless test methods to carry out test research until the test data is stable and repeated;

(6) Comprehensive comparative analysis: compare and analyze the numerical simulation results with the measured data of the scaled ball mill, and carefully analyze the reasons for the errors between the two. If the errors do not meet the requirements, modify the model and boundary conditions of the numerical simulation analysis until the numerical analysis Until the results are consistent with the measured data of the scaled ball mill; if the modified simulation results show a point that is too large compared with the corresponding parameters of the measuring point position, modify the test plan, and then carry out the corresponding experimental research;

(7) Test research report: including: static stress distribution law and dynamic stress change law of cylinder body, end cover, hollow shaft, self-aligning bearing liner and saddle contact surface; pressure and flow velocity distribution of hydrostatic bearing oil film law; the temperature change law of hydrostatic bearing oil film.

Claims (1)

1. a contracting is than ball mill test research method, and the method comprises the following steps:

(1), contracting manufactures and designs than bowl mill: with reference to certain large-size ball mill, by similarity theory, designs and bowl mill is compared in the contracting producing certain large-size ball mill;

(2) contracting, is set up than bowl mill three-dimensional finite element assembling model: quill shaft and bearing shell, self-aligning bearing are served as a contrast the contact nonlinear of body and saddle seat as boundary condition, simulation bearing is to the effect of contraction of solid of revolution, for the liner plate equivalent material density analog in the hollow mandrel interior helical guide groove of non-bearing load, the corrugated liner plate of inner barrel and left and right end cap, choose high precision unit, and carry out reasonable subdivision, end cap and cylindrical shell, to simulate by common points method between end cap and gear wheel;

(3), carry out contracting than bowl mill static and dynamic simulation: comprise hydrodinamical model, frictional heat model, boundary condition determine and analysis of simulation result; The operating mode of STATIC SIMULATION is fully loaded static, serves as a contrast the emulation of the contact boundary condition between body and saddle seat based on quill shaft and bearing shell, self-aligning bearing; The operating mode of dynamic simulation starts and normally to run, based on the emulation of hydrostatic bearing stream, solid, hot multi-scenarios method boundary condition;

(4), testing scheme is worked out: comprise the selecting of testing tool equipment, rationally the determining of point position and number; According to contracting than bowl mill STATIC SIMULATION achievement, determine Structural Static pressure detection point position and number; According to contracting than bowl mill dynamic simulation achievement, determine structure dynamic stress point position and number; According to hydrostatic bearing stream, solid, hot multi-scenarios method analysis result, determine hydrostatic bearing oil film pressure point position and number;

(5), quiet dynamic test research is carried out: by the order of first static state, rear dynamic test research, according to testing scheme, adopt the method for wired test and wireless test to carry out experimental study, till test data stablizes repetition respectively;

(6), carry out Comprehensive Comparison: by numerical simulation result with contracting than the comparative analysis of bowl mill measured data, there is the reason of error in both serious analysis, if error does not meet the demands, the model of amendment numerical simulation analysis and boundary condition, till the result of numerical analysis conforms to than bowl mill measured data with contracting; If there is the point excessive compared with the corresponding parameter of point position in amended simulation result, amendment testing scheme, then carry out corresponding experimental study;

(7), experimental study report: comprising: the static stress regularity of distribution of cylindrical shell, end cap, quill shaft, self-aligning bearing lining body and saddle seat surface of contact and dynamic stress Changing Pattern; The pressure of hydrostatic bearing oil film and velocity distribution; The temperature changing regularity of hydrostatic bearing oil film.