Life prediction method of crushing equipment cutter based on finite element analysis

Abstract

The invention relates to the technical field of cutter life prediction, and discloses a crushing equipment cutter life prediction method based on finite element analysis, and the method comprises the steps: S10, determining a material of a crushing object with the maximum shearing acting force; s20, constructing a geometric model of the crushing equipment cutter according to the structure of the crushing equipment cutter; s30, obtaining a data set for finite element analysis according to the material of the crushing object and the cutter of the crushing equipment; s40, the position of the maximum stress borne by the crushing equipment cutter, the maximum stress value sigma max of the crushing equipment cutter rotating by one circle and the maximum acting force fmax borne by the crushing equipment cutter are determined; s50, finite element analysis is conducted on the position with the maximum stress through finite element analysis software, and the single-circle abrasion loss vmax generated when the cutter of the crushing equipment rotates by one circle is obtained; s60, simulating the crushing process through finite element analysis to obtain the abrasion loss Vmax of the cutter of the crushing equipment when the cutter is scrapped; and S70, calculating the service life of the cutter of the crushing equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of tool life prediction, and in particular to a method for predicting the life of a tool of a crushing equipment based on finite element analysis. Background Art

[0002] With the advancement of the "zero-waste city" construction system, solid waste pollution control has become an important issue for urban sustainable development and environmental protection. Solid waste crushing equipment includes double-shaft shredders, hammer crushers, etc. The crushing equipment cutter is the most important component of the crushing equipment. It performs shearing, tearing, impacting and other actions during high-speed operation to reduce the size and change the shape of solid waste.

[0003] In the actual production process, the wear and life of the crushing equipment tools directly affect the performance and efficiency of the crushing equipment. The crushing equipment tools will gradually wear out during long-term use, resulting in a decrease in the efficiency of its shearing, tearing, impacting and other actions, and even causing the crushing equipment tools to break. If the crushing equipment tools are broken and not cleared in time, it will cause serious damage to the crushing equipment and may even cause the entire production line to shut down. This will not only affect production efficiency, but also increase the cost of repairing and replacing tools. Therefore, accurate life prediction of crushing equipment tools and timely replacement are the key to ensuring stable operation of crushing equipment and improving production efficiency. Although the existing prediction method can predict the life of crushing equipment tools to a certain extent, it relies on a large amount of experimental data and has high prediction costs, slow prediction results, and low efficiency.

[0004] Therefore, improving the efficiency of tool life prediction for crushing equipment and reducing the prediction cost are issues that need to be addressed urgently. Summary of the invention

[0005] The technical problem to be solved by the present invention is to solve the problem that the existing prediction operation of tool life of crushing equipment is complicated, the prediction cost is high and the efficiency is low.

[0006] In order to solve the above technical problems, the present invention provides a life prediction method for a crushing equipment tool based on finite element analysis, the method comprising:

[0007] S10, determining the material of the crushing object with the maximum shearing force, wherein the material of the crushing object with the maximum shearing force is determined by calculating the theoretical shearing force of materials of different components in the crushing object;

[0008] S20, constructing a geometric model of the crushing equipment tool according to the structure of the crushing equipment tool;

[0009] S30, obtaining a data set for finite element analysis according to the material of the crushing object and the crushing equipment tool, wherein the data set includes material parameters, constraint conditions, and finite element division;

[0010] S40, importing the data set and the geometric model into finite element analysis software and performing finite element analysis on the geometric model to obtain the maximum stress position of the crushing device tool and the maximum stress value σ of the crushing device tool during one rotation max and the maximum force f max ;

[0011] S50, performing finite element analysis on the position of the maximum stress by finite element analysis software to obtain the wear amount v of the single circle of the crushing equipment cutter after one rotation max ;

[0012] S60, according to the single-turn wear amount v max Reset the data set and the geometric model of the finite element analysis software, simulate the crushing process through finite element analysis, obtain the stress condition at the point where the material of the crushing object is subjected to the maximum stress, judge whether the crushing equipment tool has reached the scrap state through the stress condition, and obtain the wear amount V of the crushing equipment tool that reaches the scrap state through the data reaching the scrap state max ;

[0013] S70, according to the single-turn wear amount v max The wear amount V of the crushing equipment tool reaches the scrap max The life of the crushing equipment tools is calculated based on the rotation speed ω of the crushing equipment tools.

[0014] Furthermore, the method further comprises:

[0015] S80, when the life of the crushing equipment tool is approaching or the actual crushing equipment operating power is close to P 实际功率 =N 刀具滚轴数量 ×(F max / f max )×P 额定功率 When the crushing equipment tool is replaced, P 实际功率 is the actual power of the crushing equipment, N 刀具滚轴数量 is the number of tool rollers, F max is the force at the maximum stress point of the tool in the scrap state, f max is the force at the maximum stress of the tool in the initial state, P 额定功率 It is the rated power of the crushing equipment.

[0016] Furthermore, in the step S10, the theoretical shear force may be calculated according to the formula:

[0017] F 理论剪切力 =h2σ b δ(1 / tanα+Z1 / δ) / 2

[0018] Calculate, where h is the thickness of the material of the crushed object, σ b is the strength limit of the tool and the crushed object, Z1 is the coefficient, δ is the relative elongation of the tool and the crushed object, α is the bite angle of the tool and the crushed object, F 理论剪切力 is the theoretical shear force.

[0019] Furthermore, in the step S20, the finite cells are divided according to the structural characteristics of the crushing equipment cutter, and the crushing equipment cutter is divided into several sections, and each section is further divided into several node units.

[0020] Furthermore, in the step S60, the stress condition is judged by the stress value of the unit node with a ratio of 30%-80% appearing in the force condition cloud diagram and the yield strength of the material of the crushing object. If the stress value of the unit node is less than the yield strength of the material of the crushing object, it indicates that the tool of the crushing equipment is in a scrap state.

[0021] Furthermore, the finite element analysis software includes ANSYS / LS-DYNA and Abaqus.

[0022] Furthermore, the material parameters include: the density of the crushing equipment tool, the elastic modulus of the crushing equipment tool and the Poisson's ratio of the crushing equipment tool, the density of the material of the crushing object, the elastic modulus of the material of the crushing object, the Poisson's ratio of the material of the crushing object and the yield stress of the material of the crushing object.

[0023] Furthermore, the finite element cell division is performed by selecting solid elements and single-point integral calculation, and performing hourglass control.

[0024] Furthermore, the constraint conditions include: translation constraint and symmetry constraint of the crushing object, rotation speed constraint of the crushing equipment tool, and initial conditions of the crushing object and the crushing equipment tool.

[0025] Furthermore, the initial conditions include the cutting angle between the crushing object and the cutter of the crushing equipment, the initial temperature, and the initial velocity of the crushing object.

[0026] Compared with the prior art, the life prediction method of a crushing equipment tool based on finite element analysis in the embodiment of the present invention has the following beneficial effects:

[0027] In the embodiment of the present invention, the material of the crushing object with the maximum shear force and the crushing equipment tool are modeled and analyzed by finite element analysis to obtain the single-circle wear amount v of the crushing equipment tool. maxThe wear amount V of the crushing equipment tool reaches the scrap max , and then calculate the life of the crushing equipment tool according to the rotation speed ω of the crushing equipment tool. Compared with the traditional prediction method that relies on a large amount of preliminary test data, the method of the present invention reduces the number of tests and costs. Through the finite element analysis software, virtual tests can be performed on the computer, avoiding material waste in actual tests, reducing prediction costs, and improving prediction efficiency; at the same time, through finite element analysis, it can accurately simulate the complex stress conditions of the crushing equipment tool in the actual crushing process, including the combined effects of multiple forces such as shearing, tearing, and impact, and also introduces multiple factors such as material parameters, load constraints, and tool structure characteristics, which ensures the accuracy of the prediction of the life of the crushing equipment tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a flow chart of a method for predicting the life of a tool of a crushing equipment based on finite element analysis provided by an embodiment of the present invention;

[0029] Figure 2 It is a model diagram of a crushing equipment cutter provided in an embodiment of the present invention.

[0030] In the figure, 10 is a small arc segment; 11 is a straight line segment; 12 is a raised segment; 13 is a large arc segment. DETAILED DESCRIPTION

[0031] The following is a description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope of the present invention. Similarly, for clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0032] like Figure 1-2 As shown, in an optional embodiment of the present invention, the present invention provides a life prediction method for a crushing equipment tool based on finite element analysis, the method comprising:

[0033] S10, determining the material of the crushing object with the maximum shearing force, wherein the material of the crushing object with the maximum shearing force is determined by calculating the theoretical shearing force of materials of different components in the crushing object;

[0034] S20, constructing a geometric model of the crushing equipment tool according to the structure of the crushing equipment tool;

[0035] S30, obtaining a data set for finite element analysis according to the material of the crushing object and the crushing equipment tool, wherein the data set includes material parameters, constraint conditions, and finite element division;

[0036] S40, importing the data set and the geometric model into finite element analysis software and performing finite element analysis on the geometric model to obtain the maximum stress position of the crushing device tool and the maximum stress value σ of the crushing device tool during one rotation max and the maximum force f max ;

[0037] S50, performing finite element analysis on the position of the maximum stress by finite element analysis software to obtain the wear amount v of the single circle of the crushing equipment cutter after one rotation max ;

[0038] S60, according to the single-turn wear amount v max Reset the data set and the geometric model of the finite element analysis software, simulate the crushing process through finite element analysis, obtain the force condition at the point of maximum stress in the material of the crushed object and the stress condition of the material of the crushed object, judge whether the crushing equipment tool has reached the scrap state through the stress condition, and obtain the wear amount V of the crushing equipment tool to reach the scrap state through the data reaching the scrap state max ;

[0039] S70, according to the single-turn wear amount v max The wear amount V of the crushing equipment tool reaches the scrap max The life of the crushing equipment tools is calculated based on the rotation speed ω of the crushing equipment tools.

[0040] The material of the crushing object in step S10 refers to the part of the crushing object that has the greatest impact on the wear of the crushing equipment tool. The finite element analysis software is ANSYS / LS-DYNA, Abaqus etc.; the material parameters are the parameters of the crushing equipment tool and the material parameters of the crushing object. The crushing equipment tool parameters include: density, elastic modulus, Poisson's ratio; the material parameters of the crushing object include: density, elastic modulus, Poisson's ratio, yield stress, tangent modulus, hardening parameter, strain rate coefficient, failure strain; the load constraints set for finite element analysis mainly refer to the translation constraint - the uniformity constraint of the crushing object in the y and z directions, the rotation constraint - the crushing equipment rotation speed, and also include the initial conditions of the crushing equipment tool and the crushing object. The initial conditions mainly refer to the cutting angle of the crushing object and the crushing equipment tool, the initial temperature, the initial velocity of the crushing object, etc.; wherein, S50, the finite element analysis is performed on the position of the maximum stress through the finite element analysis software to obtain the single-turn wear amount v of the crushing equipment tool for one rotation max This step can be achieved by introducing ANSYS / LS-DYNA and using wear model analysis; wherein, according to the single-turn wear amount v maxReset the data set and the geometric model of the finite element analysis software, and simulate the crushing process through finite element analysis. The data set here refers to the reset initial conditions; wherein the tool life formula is: T = V max / (v max (n=1)×ω), T is the tool life;

[0041] Specifically, for scrapped air conditioners, the scrapped air conditioners are taken as the crushing objects, and the steps of the crushing equipment tool life prediction method based on finite element analysis are as follows:

[0042] Step S10: In the process of processing scrapped air conditioners, common materials for crushing objects include iron outer shell of air conditioner outdoor unit, condenser and evaporator, plastic outer shell of air conditioner indoor unit, etc. According to the above component materials, 42CrMo alloy tool steel is selected as the crushing equipment tool, and the total shear force F theoretical value of materials of different crushing objects is calculated as follows:

[0043]

[0044] From the above table, we can get that the theoretical shear force of the iron outer skin of the air-conditioning outdoor unit is 1930N. Shearing the iron outer skin of the air-conditioning outdoor unit will produce the maximum theoretical shear force, which will have a relatively large wear effect on the cutter of the crushing equipment. Therefore, the iron outer skin of the air-conditioning outdoor unit is selected as the material for finite element analysis.

[0045] Step S20 and step S30: The finite element analysis software uses ANSYS / LS-DYNA software to perform geometric modeling analysis on the selected air conditioner outdoor unit iron skin and crushing equipment cutter. Define the physical parameters of the material (such as density, elastic modulus, Poisson's ratio, etc.) and load constraints (such as cutter speed, etc.). According to the structural characteristics of the crushing equipment cutter, Figure 2 The typical crushing equipment tool shown is divided into a large arc segment 13, a straight segment 11 between the protrusion and the large arc segment 13, a tool protrusion segment 12, a straight segment 11 between the protrusion and the small arc segment 10, and a small arc segment 10). Each segment is further divided into multiple node units to ensure the accuracy of the finite element analysis.

[0046] Step S40: Run the finite element analysis software to obtain the stress distribution and changes of the tool during the crushing process. Determine the maximum stress position of the tool as the small arc segment 10 tool, and record the maximum stress value σ when the tool rotates one circle max (n=1) is 332Mpa and the force f on the tool max (n=1) is 2835N.

[0047] Step S50: Select the tool unit node with the maximum stress, and use the wear model in ANSYS / LS-DYNA to analyze the wear amount v of the tool during one revolution.max (n=1) is 0.68×10^-5mm 3 .

[0048] Step S60: according to the wear amount, the initial simulation conditions are changed, such as the geometric model and the load constraint conditions, and the simulation results are re-run. When the maximum stress condition cloud diagram of the crushed object shows that 50% of the stress values ​​are less than the yield strength of the plate, the state is considered to be scrapped, and the tool reaches the scrap wear amount V max =1.935mm 3 , and record the force F acting on the tool blade at the same time max =4820N.

[0049] Step S70: According to the wear amount V of the scrapped tool max , tool single turn wear v max (n=1), tool speed ω is used to calculate tool life.

[0050] T=V max / (v max (n=1)×ω) (1)

[0051] According to formula (1), the tool can rotate 2.85×10 5 When the rotation speed is 8r / min, the service life of the tool is about 592.83 hours.

[0052] In the embodiment of the present invention, the material of the crushing object with the maximum shear force and the crushing equipment tool are modeled and analyzed by finite element analysis to obtain the single-circle wear amount v of the crushing equipment tool. max The wear amount V of the crushing equipment tool reaches the scrap max , and then calculate the life of the crushing equipment tool according to the rotation speed ω of the crushing equipment tool. Compared with the traditional prediction method that relies on a large amount of preliminary test data, the method of the present invention reduces the number of tests and costs. Through the finite element analysis software, virtual tests can be performed on the computer, avoiding material waste in actual tests, reducing prediction costs, and improving prediction efficiency; at the same time, through finite element analysis, it can accurately simulate the complex stress conditions of the crushing equipment tool in the actual crushing process, including the combined effects of multiple forces such as shearing, tearing, and impact, and also introduces multiple factors such as material parameters, load constraints, and tool structure characteristics, which ensures the accuracy of the prediction of the life of the crushing equipment tool.

[0053] In an optional embodiment of the present invention, the method further comprises:

[0054] S80, when the life of the crushing equipment tool is approaching or the actual crushing equipment operating power is close to P 实际功率 =N 刀具滚轴数量 ×(Fmax / f max )×P 额定功率 When the crushing equipment tool is replaced, P 实际功率 is the actual power of the crushing equipment, N 刀具滚轴数量 is the number of tool rollers, F max is the force at the maximum stress point of the tool in the scrap state, f max is the force at the maximum stress of the tool in the initial state, P 额定功率 It is the rated power of the crushing equipment.

[0055] Specifically, taking the above-mentioned embodiment of scrapped air conditioner as an example, a double-shaft shredder cutter structure is adopted, and the number of cutter rollers is 2. When the cutter operation time is close to the life of the shredder cutter 592.83 hours or the actual operating power of the shredder equipment is P 实际功率 When the rated power is 2.96 times (2×(F max / f max (n=1)=2.69) when the tool is replaced.

[0056] In the embodiment of the present invention, the tool replacement determination in step S80 not only improves the entire life prediction process, but also brings practical application value to the life prediction method of the crushing equipment tool by finite element analysis, and avoids the safety hazards caused by the tool during work.

[0057] The present invention also provides an embodiment for scrapped car shells, wherein the steps of a method for predicting tool life of a crushing device based on finite element analysis are as follows:

[0058] Step S10: In the process of processing scrapped automobile shells, common materials for crushing objects include iron shells, plastic shells, circuit board bare boards, etc. According to the above component materials, 42CrMo alloy tool steel is selected as the material of the crushing equipment cutter, and the total shear force F theoretical value of different materials is calculated as follows:

[0059]

[0060] Among them, shearing scrapped car body iron sheet will produce the largest theoretical shear force and will cause relatively large wear effect on the tool. Therefore, scrapped car body iron sheet is selected as the material for finite element analysis.

[0061] Step S20 and Step S30: Based on ANSYS / LS-DYNA software, we perform geometric modeling on the selected scrapped car body iron sheet and crushing tool. Define the physical parameters of the material (such as density, elastic modulus, Poisson's ratio, etc.) and load constraints (such as tool speed, etc.). According to the structural characteristics of the crushing equipment tool, Figure 2The typical crushing equipment tool shown is divided into a large arc segment 13, a straight segment 11 between the protrusion and the large arc segment 13, a tool protrusion segment 12, a straight segment 11 between the protrusion and the small arc segment 10, and a small arc segment 10). Each segment is further divided into multiple node units to ensure the accuracy of the finite element analysis.

[0062] Step S40: Run the finite element analysis software to obtain the stress distribution and changes of the tool during the crushing process. Determine the maximum stress position of the tool as the small arc segment 10 tool, and record the maximum stress value σ when the tool rotates one circle max (n=1) is 332Mpa and the force f on the tool edge max (n=1) is 3893N.

[0063] Step S50: Select the tool unit node with the maximum stress, and use the wear model in ANSYS / LS-DYNA to analyze the wear amount v of the tool during one revolution. max (n=1) is 0.93×10^-5mm 3 .

[0064] Step S60: according to the wear amount, the initial simulation conditions are changed, such as the geometric model and the load constraint conditions, and the simulation results are re-run. When the maximum stress condition cloud diagram of the crushed object shows that 60% of the stress values ​​are less than the yield strength of the plate, the state is considered to be scrapped, and the tool reaches the scrap wear amount V max =2.676mm 3 , and record the force F acting on the tool at the same time max =5300N.

[0065] Step S70: According to the wear amount V of the scrapped tool max , tool single turn wear v max (n=1), tool speed ω is used to calculate tool life.

[0066] T=V max / (v max (n=1)×ω) (1)

[0067] According to formula (1), the tool can rotate 2.87×10 5 When the rotation speed is 20r / min, the service life of the tool is about 239.78 hours.

[0068] Step S80: Determine the replacement of the cutter. A double-shaft shredder cutter structure is used. The number of cutter rollers is 2. When the cutter operation time approaches the life of the cutter of 239.78 hours or the operating power of the crushing equipment is P 实际功率 When the rated power is 2.72 times (2×(F max / f max(n=1)=2.72) to replace the tool.

[0069] In an optional embodiment of the present invention, in the step S10, the theoretical shear force may be calculated according to the formula:

[0070] F 理论剪切力 =h2σ b δ(1 / tanα+Z1 / δ) / 2

[0071] Calculate, where h is the thickness of the material of the crushed object, σ b is the strength limit of the tool and the crushed object, Z1 is the coefficient, δ is the relative elongation of the tool and the crushed object, α is the bite angle of the tool and the crushed object, F 理论剪切力 is the theoretical shear force.

[0072] Derived total force F on the tool of this structure 理论剪切力 Determined by the thickness of the sheared material h, the strength limit of the tool and the crushed object σ b , the relative elongation δ between the cutter and the crushed object, and the bite angle α between the cutter and the crushed object. Since all other factors except the bite angle α are constant, during shearing, as the cutter of the crushing equipment rotates, the shear force on the cutter is only a function of the bite angle α.

[0073] In an optional embodiment of the present invention, in the step S20, the finite cells are divided according to the structural characteristics of the crushing equipment tool, and the crushing equipment tool is divided into several sections, and each section is further divided into several node units.

[0074] Among them, the structural characteristics of different crushing equipment tools are different, including shape, size, material, and the way they are subjected to force during operation. These characteristics directly affect the accuracy of finite element analysis. Therefore, when dividing finite element cells, the structural characteristics of the tool must be fully considered. The main purpose of finite element analysis is to analyze the force on the tool to determine key parameters such as the maximum stress position, maximum stress value, and wear amount. When dividing the cells, it is necessary to ensure that the divided cells can accurately reflect the force conditions of the tool during operation.

[0075] Specifically, first, according to the structural characteristics of the tool and the requirements of force analysis, the tool is divided into several segments. The division of these segments should reflect the main force areas and deformation characteristics of the tool during operation as much as possible. In each divided segment, it is further divided into several node units. These node units are the basic units of finite element analysis, and their size and shape should be determined according to the specific conditions of the tool and the requirements of force analysis. Generally speaking, the size of the node unit should be moderate, which should be able to accurately reflect the force conditions of the tool, while avoiding overly complex divisions that increase the amount of calculation.

[0076] In the embodiment of the present invention, by dividing the finite element cells according to the structural characteristics of the tool, it can be ensured that the finite element analysis can more accurately reflect the stress conditions and deformation characteristics of the tool during operation, which helps to improve the accuracy and reliability of the finite element analysis.

[0077] In an optional embodiment of the present invention, in the step S60, the stress condition is judged by the stress value of the unit node with a ratio of 30%-80% appearing in the force condition cloud diagram and the yield strength of the material of the crushed object. If the stress value of the unit node is less than the yield strength of the material of the crushed object, it indicates that the tool of the crushing equipment is in a scrap state.

[0078] In an embodiment of the present invention, the force condition cloud map represents the magnitude and distribution of stress, strain or displacement through different colors or gray levels, so that the analysis result is more intuitive and easy to understand. The stress value on the force condition cloud map is compared with the yield strength of the material of the crushing object to determine the scrap status of the crushing equipment tool.

[0079] In an optional embodiment of the present invention, the finite element analysis software includes ANSYS / LS-DYNA and Abaqus .

[0080] In an optional embodiment of the present invention, the material parameters include: the density of the crushing equipment tool, the elastic modulus of the crushing equipment tool and the Poisson's ratio of the crushing equipment tool, the density of the material of the crushing object, the elastic modulus of the material of the crushing object, the Poisson's ratio of the material of the crushing object and the yield stress of the material of the crushing object.

[0081] In an optional embodiment of the present invention, the finite element cell division is performed by selecting solid elements and single-point integral calculation, and performing hourglass control.

[0082] Specifically, the solid element may select SOL ID164.

[0083] In an optional embodiment of the present invention, the constraint conditions include: translation constraint and symmetry constraint of the crushing object, rotation speed constraint of the crushing device tool, and initial conditions of the crushing object and the crushing device tool.

[0084] In an optional embodiment of the present invention, the initial conditions include an entry angle between the crushing object and a cutter of the crushing equipment, an initial temperature, and an initial velocity of the crushing object.

[0085] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution disclosed in the present invention can be achieved, and this document does not limit this.

[0086] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for predicting the life of a crushing equipment tool based on finite element analysis, characterized in that: The method comprises: S10, determining the material of the crushing object with the maximum shearing force, wherein the material of the crushing object with the maximum shearing force is determined by calculating the theoretical shearing force of materials of different components in the crushing object; S20, constructing a geometric model of the crushing equipment tool according to the structure of the crushing equipment tool; S30, obtaining a data set for finite element analysis according to the material of the crushing object and the crushing equipment tool, wherein the data set includes material parameters, constraint conditions, and finite element division; S40, importing the data set and the geometric model into finite element analysis software and performing finite element analysis on the geometric model to obtain the maximum stress position of the crushing device tool and the maximum stress value σ of the crushing device tool during one rotation max and the maximum force f max ; S50, performing finite element analysis on the position of the maximum stress by finite element analysis software to obtain the wear amount v of the single circle of the crushing equipment cutter after one rotation max ; S60, according to the single-turn wear amount v max Reset the data set and the geometric model of the finite element analysis software, simulate the crushing process through finite element analysis, obtain the force condition at the point of maximum stress in the material of the crushed object and the stress condition of the material of the crushed object, judge whether the crushing equipment tool has reached the scrap state through the stress condition, and obtain the wear amount V of the crushing equipment tool to reach the scrap state through the data reaching the scrap state max ; S70, according to the single-turn wear amount v max The wear amount V of the crushing equipment tool reaches the scrap max The life of the crushing equipment tools is calculated based on the rotation speed ω of the crushing equipment tools.

2. The life prediction method according to claim 1, characterized in that: The method further comprises: S80, when the life of the crushing equipment tool is approaching or the actual crushing equipment operating power is close to P 实际功率 =N 刀具滚轴数量 ×(F max / f max )×P 额定功率 When the crushing equipment tool is replaced, P 实际功率 is the actual power of the crushing equipment, N 刀具滚轴数量 is the number of tool rollers, F max is the force at the maximum stress point of the tool in the scrap state, f max is the force at the maximum stress of the tool in the initial state, P 额定功率 It is the rated power of the crushing equipment.

3. The life prediction method according to claim 1, characterized in that: In the step S10, the theoretical shear force may be calculated according to the formula: F 理论剪切力 =h2σ b δ(1 / tanα+Z1 / δ) / 2 Calculate, where h is the thickness of the material of the crushed object, σ b is the strength limit of the tool and the crushed object, Z1 is the coefficient, δ is the relative elongation of the tool and the crushed object, α is the bite angle of the tool and the crushed object, F 理论剪切力 is the theoretical shear force.

4. The life prediction method according to claim 1, characterized in that: In the step S20, the finite cells are divided according to the structural characteristics of the crushing equipment cutter, and the crushing equipment cutter is divided into several sections, and each section is further divided into several node units.

5. The life prediction method according to claim 1, characterized in that: In the step S60, the stress condition is judged by the stress value of the unit node with a ratio of 30%-80% appearing in the force condition cloud diagram and the yield strength of the material of the crushing object. If the stress value of the unit node is less than the yield strength of the material of the crushing object, it indicates that the tool of the crushing equipment is in a scrap state.

6. The life prediction method according to claim 1, characterized in that: The finite element analysis software includes ANSYS / LS-DYNA and Abaqus.

7. The life prediction method according to claim 1, characterized in that: The material parameters include: density of the crushing equipment tool, elastic modulus of the crushing equipment tool and Poisson's ratio of the crushing equipment tool, density of the material of the crushing object, elastic modulus of the material of the crushing object, Poisson's ratio of the material of the crushing object and yield stress of the material of the crushing object.

8. The life prediction method according to claim 1, characterized in that: The finite element cell division is performed by selecting solid elements and single-point integral calculation and performing hourglass control.

9. The life prediction method according to claim 1, characterized in that: The constraint conditions include: translation constraint and symmetry constraint of the crushing object, rotation speed constraint of the crushing equipment tool, and initial conditions of the crushing object and the crushing equipment tool.

10. The life prediction method according to claim 9, characterized in that: The initial conditions include the cutting angle between the crushing object and the cutter of the crushing equipment, the initial temperature, and the initial velocity of the crushing object.

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