[go: up one dir, main page]

CN117972946B - Development machine turntable bearing strength evaluation method and system and readable storage medium - Google Patents

Development machine turntable bearing strength evaluation method and system and readable storage medium Download PDF

Info

Publication number
CN117972946B
CN117972946B CN202410391712.4A CN202410391712A CN117972946B CN 117972946 B CN117972946 B CN 117972946B CN 202410391712 A CN202410391712 A CN 202410391712A CN 117972946 B CN117972946 B CN 117972946B
Authority
CN
China
Prior art keywords
mode
turntable
tunneling
load
finite element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202410391712.4A
Other languages
Chinese (zh)
Other versions
CN117972946A (en
Inventor
付稣昇
尹力
赵北
孙衍石
边树杰
于宏滨
李唐
王宇霆
倪瑞林
段存虎
李楠
石磊
韩晓极
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sany Heavy Equipment Co Ltd
Original Assignee
Sany Heavy Equipment Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sany Heavy Equipment Co Ltd filed Critical Sany Heavy Equipment Co Ltd
Priority to CN202410391712.4A priority Critical patent/CN117972946B/en
Publication of CN117972946A publication Critical patent/CN117972946A/en
Application granted granted Critical
Publication of CN117972946B publication Critical patent/CN117972946B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/17—Mechanical parametric or variational design
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/02—Reliability analysis or reliability optimisation; Failure analysis, e.g. worst case scenario performance, failure mode and effects analysis [FMEA]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Geometry (AREA)
  • General Physics & Mathematics (AREA)
  • Evolutionary Computation (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Computational Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Pure & Applied Mathematics (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)

Abstract

The application provides a method and a system for evaluating the bearing strength of a development machine turntable, and a readable storage medium, and relates to the technical field of development machines, wherein the method for evaluating the bearing strength of the development machine turntable comprises the following steps: establishing a turntable finite element model; determining a load mode of the heading machine according to the working process load characteristic of the heading machine, wherein the load mode comprises an effective heading mode and a difficult heading mode; carrying out bearing strength evaluation of the rotary table in the effective tunneling mode according to the finite element model of the rotary table and the effective tunneling working load; monitoring the flow of a hydraulic system of the heading machine; carrying out bearing strength evaluation of the turntable in a difficult tunneling mode according to the turntable finite element model and the dynamic load coefficient; and planning a cutting path according to the time history and the excavator, calculating the finite element time mileage intensity, and evaluating the effective life of the turntable. By the technical scheme, the matching performance in the analysis of the actual damage problem of the heading machine is good, and the result reliability is high.

Description

Development machine turntable bearing strength evaluation method and system and readable storage medium
Technical Field
The application relates to the technical field of heading machines, in particular to a method and a system for evaluating bearing strength of a revolving platform of a heading machine and a readable storage medium.
Background
The tunnel boring machine is a main tool in the process of drilling coal mines, mines and tunnels, has a bad working environment, and aims at coal, hard rock stones and the like.
The main machine structure of the heading machine is pushed by the crawler belt, firstly, the cutting head is used for punching the drilling surface to drill the wall surface, and then the working process of sweeping the rock wall and vertically sweeping the rock wall is continuously completed based on a planned route.
The development machine realizes drilling, and the driving crawler belt drives the additional cutting head to rotate; the development machine starts to perform horizontal scanning and vertical scanning based on a planned path, wherein the rotary table is pushed and pulled respectively through two sides of the rotary driving oil cylinder, so that the rotary table rotates around the rotary main rotary bearing; one end of the lifting cylinder is connected with the middle rotary table earring, and the other end of the lifting cylinder is connected with the electric appliance box body, and the rotary table also needs to be used as a bearing structure for bearing load in the lifting working process of the heading machine. Therefore, a scientific calculation analysis methodology suitable for reloading the bearing strength of the rotary table of the heading machine is required to be found, the structural strength bearing strength of the rotary table of the heading machine is analyzed, and the problem of fatigue effective life calculation is solved.
Disclosure of Invention
The present application aims to solve or ameliorate at least one of the above problems.
To this end, a first object of the present application is to provide a method for evaluating the bearing strength of a turret of a heading machine.
The second object of the application is to provide a system for evaluating the bearing strength of the rotary table of the first heading machine.
A third object of the present application is to provide another system for evaluating the bearing strength of a turntable of a second heading machine.
A fourth object of the present application is to provide a readable storage medium.
In order to achieve the first object of the present application, a technical solution of the first aspect of the present application provides a method for evaluating bearing strength of a turntable of a heading machine, including: establishing a turntable finite element model; determining a load mode of the heading machine according to the working process load characteristic of the heading machine, wherein the load mode comprises an effective heading mode and a difficult heading mode; when the load mode is an effective tunneling mode, acquiring an effective tunneling working load, and evaluating the bearing strength of the turntable in the effective tunneling mode according to the turntable finite element model and the effective tunneling working load; when the load mode is a difficult tunneling mode, carrying out flow monitoring on a hydraulic system of the tunneling machine to obtain monitoring data, wherein the monitoring data comprises a flow peak value and a time history; determining a dynamic load coefficient according to the monitoring data; carrying out bearing strength evaluation of the turntable in a difficult tunneling mode according to the turntable finite element model and the dynamic load coefficient; and planning a cutting path according to the time course and the excavator, calculating the finite element time mileage intensity, and evaluating the effective life of the rotary table according to the calculation result.
According to the method for evaluating the bearing strength of the rotary table of the heading machine, firstly, a finite element model of the rotary table is built. And then determining the load mode of the heading machine according to the working process load characteristics of the heading machine, wherein the load mode comprises an effective heading mode and a difficult heading mode. The effective tunneling mode considers normal rotation and the lifting oil cylinder to push the cutting head to horizontally and vertically sweep and cut tunnel rocks, and the rock is broken by a resistance load source. The hard rock cannot be effectively cut by the cutting head of the heading machine in the difficult tunneling mode, the oil cylinder outputs repeated vibration at the moment, the cutting head impacts the cut rock, the effective load source in the difficult tunneling mode is the oil cylinder outputs instantaneous impact oil pressure, and the flow monitoring of a hydraulic system is needed. And when the load mode is an effective tunneling mode, acquiring an effective tunneling working load, and evaluating the bearing strength of the turntable in the effective tunneling mode according to the turntable finite element model and the effective tunneling working load. And when the load mode is a difficult tunneling mode, monitoring the flow of the hydraulic system of the tunneling machine to obtain monitoring data. And then determining the dynamic load coefficient according to the monitoring data. And carrying out bearing strength evaluation of the turntable in the difficult tunneling mode according to the turntable finite element model and the dynamic load coefficient. And finally, planning a cutting path according to the time history and the excavator, calculating the finite element time mileage intensity, and evaluating the effective life of the rotary table according to a calculation result. By evaluating the strength and fatigue capability around the structural bearing strength of the turntable of the tunneling machine, an effective tunneling mode and a difficult tunneling mode evaluation technology are established, and various tunneling load possibilities possibly occurring in the working process of the tunnel tunneling machine can be considered. The strength evaluation capability of the normal rated development machine turntable is judged by the effective development mode, the consideration of margin space safety is effectively carried out based on the design of safety margin, and the optimization can be carried out to a certain extent based on the margin. The calculation method of the difficult tunneling mode considers the structural damage position under the overload or dynamic load impact condition, pre-judges the damage possibility in advance, and can complete the fatigue resistance calculation capability of the rotary table by combining the planned tunnel cutting path, thereby being capable of carrying out service life assessment. In the analysis calibration of the actual damage problem of the tunnel boring machine, the matching performance is good, and the result reliability is high.
In addition, the technical scheme provided by the application can also have the following additional technical characteristics:
In some embodiments, optionally, building a turret finite element model includes: constructing a rotary table finite element model, wherein the rotary table finite element model comprises an electric box, a rotary table, a body frame, a main rotary bearing, an oil cylinder and a high-strength bolt, and the oil cylinder comprises a rotary oil cylinder and a lifting oil cylinder; establishing connection relations among the electric box, the rotary table, the body frame and the main rotary bearing, wherein the connection relations comprise joint surface contact, binding and bolt connection; and establishing a linear pair and a rotary pair among the rotary table, the body frame and the oil cylinder.
In the technical scheme, a rotary table finite element model is built, and specifically, the rotary table finite element model is built firstly and comprises an electric appliance box, a rotary table, a body frame, a main rotary bearing, a rotary oil cylinder, a lifting oil cylinder, a high-strength bolt and the like. And then establishing connection relations among the junction surface contact, binding, the electric appliance box connected by bolts, the rotary table, the body frame and the main rotary bearing. And establishing a linear pair and a rotary pair among the rotary table, the body frame and the oil cylinder. By establishing the turntable finite element model, the bearing strength of the turntable of the heading machine can be evaluated.
In some technical schemes, optionally, the electrical box and the rotary table are connected through a lifting oil cylinder, the rotary table is connected with the main rotary bearing through a high-strength bolt, and the body frame is connected with the rotary table through a rotary oil cylinder.
In the technical scheme, in the rotary table finite element model, an electric box and the rotary table are connected through a lifting oil cylinder, and a connecting joint is constructed by adopting a hinge kinematic pair. The turntable and the main slewing bearing are connected by adopting high-strength bolts, friction contact is established between the joint surfaces, and the contact friction coefficient adopts a recommended value of 0.15. The main slewing bearing is installed on the body frame structure and is simulated by adopting a binding contact relationship. The body frame and the rotary table are connected and driven by adopting a rotary oil cylinder, and the connecting joint is constructed by adopting a hinged kinematic pair. And a linear motion pair is adopted between the cylinder piston and the cylinder cavity for simulation.
In some technical solutions, optionally, when the load mode is an effective tunneling mode, acquiring an effective tunneling working load, and performing an effective tunneling mode turntable bearing strength evaluation according to the turntable finite element model and the effective tunneling working load, including: when the load mode is an effective tunneling mode, the bottom end of the body frame structure is restrained; the three-way force of the cutting head based on the rotary working condition and the lifting working condition is reversely pushed by a hydraulic cylinder mechanical rod system method, and an effective tunneling working load is obtained according to the three-way force of the cutting head; and loading the center position of the cutting head according to the effective tunneling working load, and applying and coupling the cutting head to the front end surface of the electric box by utilizing a Remote Force to finish the structural strength evaluation of the effective tunneling mode.
In the technical scheme, when the load mode is an effective tunneling mode, an effective tunneling working load is acquired, and the bearing strength of the turntable in the effective tunneling mode is evaluated according to the turntable finite element model and the effective tunneling working load. And then reversely pushing the three-directional force of the cutting head under the rotation working condition and the lifting working condition based on the hydraulic cylinder mechanical rod system method, and obtaining effective tunneling working load according to the three-directional force of the cutting head. And finally, loading the center position of the cutting head according to the effective tunneling working load, and applying and coupling the cutting head to the front end surface of the electric box by utilizing a Remote Force to finish the structural strength evaluation of the effective tunneling mode. Wherein Remote Force is the distal Force.
In some technical solutions, optionally, when the load mode is a difficult tunneling mode, performing flow monitoring on a hydraulic system of the tunneling machine to obtain monitoring data, where the monitoring data includes a flow peak value and a time history, and the method includes: when the load mode is a difficult tunneling mode, monitoring the flow signal change process of the rotary oil cylinder and the lifting oil cylinder when cutting the rock wall through a flow sensor, and determining the flow peak value and the time history of the difficult tunneling mode; and determining the limit working condition and time sequence load of the rotary table according to the flow peak value and the time history.
In the technical scheme, when the load mode is the difficult tunneling mode, the hydraulic system of the tunneling machine is subjected to flow monitoring to obtain monitoring data, wherein the monitoring data comprise flow peak values and time histories, and particularly, when the load mode is the difficult tunneling mode, the flow signal change process of the rotary oil cylinder and the lifting oil cylinder during cutting of a rock wall is monitored through a flow sensor, and the flow peak values and the time histories of the difficult tunneling mode are determined. And then determining the limit working condition and time sequence load of the rotary table according to the flow peak value and the time history.
In some embodiments, optionally, determining the dynamic load coefficient according to the monitoring data includes: determining an instantaneous output dynamic load coefficient according to the flow peak value and the rated flow ratio; acquiring a dynamic load coefficient; and determining the dynamic load coefficient of the rotary oil cylinder and the dynamic load coefficient of the lifting oil cylinder according to the monitoring data and the dynamic load coefficient.
In the technical scheme, the dynamic load coefficient is determined according to the monitoring data, and particularly, the instantaneous output dynamic load coefficient is firstly determined according to the flow peak value and the rated flow ratio. And then acquiring the dynamic load coefficient. And finally, determining the dynamic load coefficient of the rotary oil cylinder and the dynamic load coefficient of the lifting oil cylinder according to the monitoring data and the dynamic load coefficient.
In some embodiments, optionally, the evaluating the bearing strength of the turntable in the difficult tunneling mode according to the finite element model and the dynamic load coefficient of the turntable includes: constraining the center position of the cutting head through Remote Displacement; and applying a load to the rotary oil cylinder and the lifting oil cylinder according to the instantaneous output dynamic load coefficient to finish the structural strength evaluation of the difficult tunneling mode.
In the technical scheme, the bearing strength of the turntable in the difficult tunneling mode is evaluated according to the turntable finite element model and the dynamic load coefficient, and specifically, the center position of the cutting head is restrained through Remote Displacement. And then, applying a load to the rotary oil cylinder and the lifting oil cylinder according to the instantaneous output dynamic load coefficient, and completing the structural strength evaluation of the difficult tunneling mode.
In some technical solutions, optionally, according to the time history, planning a cutting path in combination with the excavator, performing finite element time mileage intensity calculation, and according to a calculation result, evaluating the effective life of the turntable, including: establishing a finite element calculation model of a difficult tunneling working condition based on a bolt structural form, and calculating pretightening force according to yield strength and dangerous section diameter; establishing the plasticity characteristics of the nonlinear materials of the bolts; calculating an SN curve of the turntable structure based on the tensile strength through nCode DesignLife; according to the time history in the monitoring data, combining the transverse scanning and vertical scanning planning paths of the excavator to complete the calculation and analysis of the finite element time mileage intensity and obtain the calculation result of the finite element time step; and introducing nCode DesignLife the finite element time step calculation result to obtain accumulated damage of the primary planning path of the heading machine, and evaluating the service life times of the rotary table according to the accumulated damage.
According to the technical scheme, a cutting path is planned according to the combination of a time course and a excavator, finite element time mileage intensity calculation is carried out, the effective service life of the rotary table is estimated according to a calculation result, and particularly, a finite element calculation model for difficult tunneling working conditions is firstly built based on a bolt structural form, and pretightening force is calculated according to yield intensity and dangerous section diameter. The non-linear material plastic properties of the bolt are then established. The SN curve of the turret structure is then calculated by nCode DesignLife based on the tensile strength. And according to the time history in the monitoring data, combining the planned path of the transverse scanning and the vertical scanning of the excavator to finish the calculation and analysis of the finite element time mileage intensity and obtain the calculation result of the finite element time step. And finally, introducing nCode DesignLife a finite element time step calculation result to obtain accumulated damage of the primary planning path of the heading machine, and evaluating the service life times of the rotary table according to the accumulated damage.
In order to achieve the second object of the present application, a technical solution of the second aspect of the present application provides a bearing strength evaluation system for a turntable of a first heading machine, including: the model building module is used for building a turntable finite element model; the system comprises a mode determining module, a driving module and a driving module, wherein the mode determining module is used for determining a load mode of the tunneling machine according to the working process load characteristic of the tunneling machine, and the load mode comprises an effective tunneling mode and a difficult tunneling mode; the first evaluation module is used for acquiring an effective tunneling working load when the load mode is an effective tunneling mode, and evaluating the bearing strength of the turntable in the effective tunneling mode according to the turntable finite element model and the effective tunneling working load; the flow monitoring module is used for monitoring the flow of the hydraulic system of the heading machine when the load mode is a difficult tunneling mode, so as to obtain monitoring data, wherein the monitoring data comprises a flow peak value and a time history; the coefficient acquisition module is used for determining a dynamic load coefficient according to the monitoring data; the second evaluation module is used for evaluating the bearing strength of the turntable in the difficult tunneling mode according to the turntable finite element model and the dynamic load coefficient; and the third evaluation module is used for planning a cutting path according to the time history in combination with the excavator, calculating the finite element time mileage intensity, and evaluating the effective life of the rotary table according to the calculation result.
The application provides a bearing strength evaluation system of a rotary table of a heading machine, which comprises a model building module, a mode determining module, a first evaluation module, a flow monitoring module, a coefficient acquisition module, a second evaluation module and a third evaluation module. The model building module is used for building a turntable finite element model. The mode determining module is used for determining a load mode of the heading machine according to the working process load characteristic of the heading machine, wherein the load mode comprises an effective heading mode and a difficult heading mode. The first evaluation module is used for acquiring an effective tunneling working load when the load mode is an effective tunneling mode, and evaluating the bearing strength of the turntable in the effective tunneling mode according to the turntable finite element model and the effective tunneling working load. The flow monitoring module is used for monitoring the flow of the hydraulic system of the heading machine when the load mode is a difficult tunneling mode, so as to obtain monitoring data, wherein the monitoring data comprises a flow peak value and a time history. The coefficient acquisition module is used for determining the dynamic load coefficient according to the monitoring data. And the second evaluation module is used for evaluating the bearing strength of the turntable in the difficult tunneling mode according to the turntable finite element model and the dynamic load coefficient. The third evaluation module is used for planning a cutting path according to the time history in combination with the excavator, calculating the finite element time mileage intensity, and evaluating the effective life of the rotary table according to the calculation result. By evaluating the strength and fatigue capability around the structural bearing strength of the turntable of the tunneling machine, an effective tunneling mode and a difficult tunneling mode evaluation technology are established, and various tunneling load possibilities possibly occurring in the working process of the tunnel tunneling machine can be considered. The strength evaluation capability of the normal rated development machine turntable is judged by the effective development mode, the consideration of margin space safety is effectively carried out based on the design of safety margin, and the optimization can be carried out to a certain extent based on the margin. The calculation method of the difficult tunneling mode considers the structural damage position determination under the overload or dynamic load impact condition, pre-judges the damage possibility in advance, and can complete the fatigue resistance calculation capability of the rotary table by combining the planned tunnel cutting path, thereby being capable of carrying out service life assessment. In the analysis calibration of the actual damage problem of the tunnel boring machine, the matching performance is good, and the result reliability is high.
In order to achieve the third object of the present application, a technical solution of a third aspect of the present application provides a system for evaluating bearing strength of a turntable of a second heading machine, including: the system comprises a memory and a processor, wherein the memory stores a program or an instruction capable of running on the processor, and the processor realizes the steps of the method for evaluating the bearing strength of the rotary table of the heading machine in any one of the technical schemes in the first aspect when executing the program or the instruction, so that the system has the technical effects of any one of the technical schemes in the first aspect, and the description is omitted.
In order to achieve the fourth object of the present application, a fourth aspect of the present application provides a readable storage medium having a program or an instruction stored thereon, wherein the program or the instruction, when executed by a processor, implements the steps of the method for evaluating the bearing strength of a turntable of a heading machine according to any one of the first aspect, so that the method has the technical effects of any one of the first aspect, and is not repeated herein.
Additional aspects and advantages of the application will be set forth in part in the description which follows, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic flow chart of a method for evaluating bearing strength of a turntable of a heading machine according to an embodiment of the application;
FIG. 2 is a second step flow chart of a method for evaluating bearing strength of a turntable of a heading machine according to an embodiment of the application;
FIG. 3 is a third step flow chart of a method for evaluating bearing strength of a turntable of a heading machine according to an embodiment of the application;
FIG. 4 is a flowchart illustrating a method for evaluating bearing strength of a turntable of a heading machine according to an embodiment of the present application;
FIG. 5 is a flowchart illustrating a method for evaluating bearing strength of a turntable of a heading machine according to an embodiment of the present application;
FIG. 6 is a flowchart illustrating a method for evaluating bearing strength of a turntable of a heading machine according to an embodiment of the present application;
FIG. 7 is a flowchart illustrating a method for evaluating bearing strength of a turntable of a heading machine according to an embodiment of the application;
FIG. 8 is a block diagram schematically illustrating a first development machine turret bearing strength evaluation system according to one embodiment of the present application;
FIG. 9 is a block diagram schematically illustrating a system for evaluating the bearing strength of a turntable of a second heading machine according to another embodiment of the application;
fig. 10 is a flowchart illustrating a step of a method for evaluating a bearing strength of a turntable of a heading machine according to an embodiment of the application.
Wherein, the correspondence between the reference numerals and the component names in fig. 8 and 9 is:
10: the bearing strength evaluation system of the first heading machine turntable; 110: a model building module; 120: a mode determination module; 130: a first evaluation module; 140: a flow monitoring module; 150: a coefficient acquisition module; 160: a second evaluation module; 170: a third evaluation module; 20: the bearing strength evaluation system of the second heading machine turntable; 300: a memory; 400: a processor.
Detailed Description
In order that the above-recited objects, features and advantages of the present application will be more clearly understood, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited to the specific embodiments disclosed below.
Methods and systems for evaluating bearing strength of a turntable of a heading machine, and readable storage media according to some embodiments of the present application are described below with reference to fig. 1 to 10.
As shown in fig. 1, an embodiment of the first aspect of the present application provides one of the methods for evaluating the bearing strength of a turntable of a heading machine, including the following steps:
Step S102: establishing a turntable finite element model;
Step S104: determining a load mode of the heading machine according to the working process load characteristic of the heading machine, wherein the load mode comprises an effective heading mode and a difficult heading mode;
Step S106: when the load mode is an effective tunneling mode, acquiring an effective tunneling working load, and evaluating the bearing strength of the turntable in the effective tunneling mode according to the turntable finite element model and the effective tunneling working load;
Step S108: when the load mode is a difficult tunneling mode, carrying out flow monitoring on a hydraulic system of the tunneling machine to obtain monitoring data, wherein the monitoring data comprises a flow peak value and a time history;
Step S110: determining a dynamic load coefficient according to the monitoring data;
step S112: carrying out bearing strength evaluation of the turntable in a difficult tunneling mode according to the turntable finite element model and the dynamic load coefficient;
Step S114: and planning a cutting path according to the time course and the excavator, calculating the finite element time mileage intensity, and evaluating the effective life of the rotary table according to the calculation result.
According to the method for evaluating the bearing strength of the rotary table of the heading machine, which is provided by the embodiment, a finite element model of the rotary table is firstly established. And then determining the load mode of the heading machine according to the working process load characteristics of the heading machine, wherein the load mode comprises an effective heading mode and a difficult heading mode. The effective tunneling mode considers normal rotation and the lifting oil cylinder to push the cutting head to horizontally and vertically sweep and cut tunnel rocks, and the rock is broken by a resistance load source. The hard rock cannot be effectively cut by the cutting head of the heading machine in the difficult tunneling mode, the oil cylinder outputs repeated vibration at the moment, the cutting head impacts the cut rock, the effective load source in the difficult tunneling mode is the oil cylinder outputs instantaneous impact oil pressure, and the flow monitoring of a hydraulic system is needed. And when the load mode is an effective tunneling mode, acquiring an effective tunneling working load, and evaluating the bearing strength of the turntable in the effective tunneling mode according to the turntable finite element model and the effective tunneling working load. And when the load mode is a difficult tunneling mode, monitoring the flow of the hydraulic system of the tunneling machine to obtain monitoring data. And then determining the dynamic load coefficient according to the monitoring data. And carrying out bearing strength evaluation of the turntable in the difficult tunneling mode according to the turntable finite element model and the dynamic load coefficient. And finally, planning a cutting path according to the time history and the excavator, calculating the finite element time mileage intensity, and evaluating the effective life of the rotary table according to a calculation result. By evaluating the strength and fatigue capability around the structural bearing strength of the turntable of the tunneling machine, an effective tunneling mode and a difficult tunneling mode evaluation technology are established, and various tunneling load possibilities possibly occurring in the working process of the tunnel tunneling machine can be considered. The strength evaluation capability of the normal rated development machine turntable is judged by the effective development mode, the consideration of margin space safety is effectively carried out based on the design of safety margin, and the optimization can be carried out to a certain extent based on the margin. The calculation method of the difficult tunneling mode considers the structural damage position under the overload or dynamic load impact condition, pre-judges the damage possibility in advance, and can complete the fatigue resistance calculation capability of the rotary table by combining the planned tunnel cutting path, thereby being capable of carrying out service life assessment. In the analysis calibration of the actual damage problem of the tunnel boring machine, the matching performance is good, and the result reliability is high.
As shown in fig. 2, according to a second embodiment of the application, a method for evaluating bearing strength of a turntable of a heading machine is provided, and a finite element model of the turntable is built, which specifically includes the following steps:
Step S202: constructing a rotary table finite element model, wherein the rotary table finite element model comprises an electric box, a rotary table, a body frame, a main rotary bearing, a rotary oil cylinder, a lifting oil cylinder and a high-strength bolt;
Step S204: establishing connection relations among the electric box, the rotary table, the body frame and the main rotary bearing, wherein the connection relations comprise joint surface contact, binding and bolt connection;
step S206: and establishing a linear pair and a rotary pair among the rotary table, the body frame and the oil cylinder.
In the embodiment, a finite element model of the rotary table is built, specifically, the finite element model of the rotary table is built firstly, and the finite element model comprises an electric box, the rotary table, a body frame, a main rotary bearing, a rotary oil cylinder, a lifting oil cylinder, a high-strength bolt and the like. And then establishing connection relations among the junction surface contact, binding, the electric appliance box connected by bolts, the rotary table, the body frame and the main rotary bearing. And establishing a linear pair and a rotary pair among the rotary table, the body frame and the oil cylinder. In the finite element model of the rotary table, an electric box and the rotary table are connected through a lifting oil cylinder, and a connecting joint is constructed by adopting a hinged kinematic pair. The turntable and the main slewing bearing are connected by adopting high-strength bolts, friction contact is established between the joint surfaces, and the contact friction coefficient adopts a recommended value of 0.15. The main slewing bearing is installed on the body frame structure and is simulated by adopting a binding contact relationship. The body frame and the rotary table are connected and driven by adopting a rotary oil cylinder, and the connecting joint is constructed by adopting a hinged kinematic pair. And a linear motion pair is adopted between the cylinder piston and the cylinder cavity for simulation.
As shown in fig. 3, according to a third embodiment of the present application, when the load mode is an effective tunneling mode, an effective tunneling working load is obtained, and the bearing strength of the turntable in the effective tunneling mode is estimated according to the turntable finite element model and the effective tunneling working load, specifically including the following steps:
step S302: when the load mode is an effective tunneling mode, the bottom end of the body frame structure is restrained;
step S304: the three-way force of the cutting head based on the rotary working condition and the lifting working condition is reversely pushed by a hydraulic cylinder mechanical rod system method, and an effective tunneling working load is obtained according to the three-way force of the cutting head;
Step S306: and loading the center position of the cutting head according to the effective tunneling working load, and applying and coupling the cutting head to the front end surface of the electric box by utilizing a Remote Force to finish the structural strength evaluation of the effective tunneling mode.
In the embodiment, when the load mode is the effective tunneling mode, the effective tunneling working load is obtained, and the bearing strength of the turntable in the effective tunneling mode is evaluated according to the turntable finite element model and the effective tunneling working load, specifically, when the load mode is the effective tunneling mode, the bottom end of the main body frame structure is restrained. And then reversely pushing the three-directional force of the cutting head under the rotation working condition and the lifting working condition based on the hydraulic cylinder mechanical rod system method, and obtaining effective tunneling working load according to the three-directional force of the cutting head. And finally, loading the center position of the cutting head according to the effective tunneling working load, and applying and coupling the cutting head to the front end surface of the electric box by utilizing a Remote Force to finish the structural strength evaluation of the effective tunneling mode. Wherein Remote Force is the distal Force.
As shown in fig. 4, according to a fourth embodiment of the present application, when the load mode is a difficult tunneling mode, the hydraulic system of the heading machine is monitored for flow rate to obtain monitoring data, wherein the monitoring data includes a flow rate peak value and a time history, and the method specifically includes the following steps:
step S402: when the load mode is a difficult tunneling mode, monitoring the flow signal change process of the rotary oil cylinder and the lifting oil cylinder when cutting the rock wall through a flow sensor, and determining the flow peak value and the time history of the difficult tunneling mode;
step S404: and determining the limit working condition and time sequence load of the rotary table according to the flow peak value and the time history.
In the embodiment, when the load mode is the difficult tunneling mode, the hydraulic system of the tunneling machine is subjected to flow monitoring to obtain monitoring data, wherein the monitoring data comprise flow peak values and time histories, and particularly when the load mode is the difficult tunneling mode, the flow signal change process of the rotary oil cylinder and the lifting oil cylinder during cutting of the rock wall is monitored through the flow sensor, and the flow peak values and the time histories of the difficult tunneling mode are determined. And then determining the limit working condition and time sequence load of the rotary table according to the flow peak value and the time history.
As shown in fig. 5, a fifth method for evaluating bearing strength of a turntable of a heading machine according to an embodiment of the present application determines a dynamic load coefficient according to monitoring data, including the following steps:
step S502: determining an instantaneous output dynamic load coefficient according to the flow peak value and the rated flow ratio;
Step S504: acquiring a dynamic load coefficient;
step S506: and determining the dynamic load coefficient of the rotary oil cylinder and the dynamic load coefficient of the lifting oil cylinder according to the monitoring data and the dynamic load coefficient.
In this embodiment, the dynamic load coefficient is determined according to the monitoring data, specifically, the instantaneous output dynamic load coefficient is first determined according to the flow peak value and the rated flow ratio. And then acquiring the dynamic load coefficient. And finally, determining the dynamic load coefficient of the rotary oil cylinder and the dynamic load coefficient of the lifting oil cylinder according to the monitoring data and the dynamic load coefficient.
As shown in fig. 6, a method for evaluating bearing strength of a turntable of a heading machine according to an embodiment of the present application, which evaluates bearing strength of the turntable in a difficult heading mode according to a finite element model and a dynamic load coefficient of the turntable, includes the following steps:
step S602: constraining the center position of the cutting head through Remote Displacement;
step S604: and applying a load to the rotary oil cylinder and the lifting oil cylinder according to the instantaneous output dynamic load coefficient to finish the structural strength evaluation of the difficult tunneling mode.
In this embodiment, the difficult tunneling mode turret bearing strength assessment is performed based on the turret finite element model and dynamic load coefficients, specifically by first constraining the center position of the cutting head through Remote Displacement. And then, applying a load to the rotary oil cylinder and the lifting oil cylinder according to the instantaneous output dynamic load coefficient, and completing the structural strength evaluation of the difficult tunneling mode. Wherein Remote Displacement is a distal displacement for guiding the displacement of a structural face or edge from a remote point.
As shown in fig. 7, according to a seventh embodiment of the present application, a method for evaluating the bearing strength of a turntable of a heading machine, performing finite element time mileage strength calculation according to a time history in combination with a planned cutting path of the heading machine, and evaluating the effective life of the turntable according to a calculation result, includes the following steps:
step S702: establishing a finite element calculation model of a difficult tunneling working condition based on a bolt structural form, and calculating pretightening force according to yield strength and dangerous section diameter;
Step S704: establishing the plasticity characteristics of the nonlinear materials of the bolts;
Step S706: calculating an SN curve of the turntable structure based on the tensile strength through nCode DesignLife;
Step S708: according to the time history in the monitoring data, combining the transverse scanning and vertical scanning planning paths of the excavator to complete the calculation and analysis of the finite element time mileage intensity and obtain the calculation result of the finite element time step;
Step S710: and introducing nCode DesignLife the finite element time step calculation result to obtain accumulated damage of the primary planning path of the heading machine, and evaluating the service life times of the rotary table according to the accumulated damage.
In the embodiment, a cutting path is planned according to the combination of a time history and a excavator, finite element time mileage intensity calculation is carried out, the effective service life of the rotary table is estimated according to a calculation result, specifically, a finite element calculation model of a difficult tunneling working condition is firstly established based on a bolt structural form, and pretightening force is calculated according to yield intensity and dangerous section diameter. The non-linear material plastic properties of the bolt are then established. The SN curve of the turret structure is then calculated by nCode DesignLife based on the tensile strength. And according to the time history in the monitoring data, combining the planned path of the transverse scanning and the vertical scanning of the excavator to finish the calculation and analysis of the finite element time mileage intensity and obtain the calculation result of the finite element time step. And finally, introducing nCode DesignLife a finite element time step calculation result to obtain accumulated damage of the primary planning path of the heading machine, and evaluating the service life times of the rotary table according to the accumulated damage. Wherein nCode DesignLife is fatigue analysis software. The SN curve is a curve which takes the fatigue strength of a standard test piece of a material as an ordinate and takes the logarithmic value of the fatigue life as an abscissa, and represents the relation between the fatigue strength and the fatigue life of the standard test piece under certain cycle characteristics, and is also called a stress-life curve.
As shown in fig. 8, an embodiment of the second aspect of the present application provides a first heading machine turret bearing strength assessment system 10, comprising: a model building module 110 for building a turntable finite element model; the mode determining module 120 is configured to determine a load mode of the heading machine according to a working process load characteristic of the heading machine, where the load mode includes an effective tunneling mode and a difficult tunneling mode; the first evaluation module 130 is configured to obtain an effective tunneling working load when the load mode is an effective tunneling mode, and perform an effective tunneling mode turntable bearing strength evaluation according to the turntable finite element model and the effective tunneling working load; the flow monitoring module 140 is configured to monitor a flow of the hydraulic system of the heading machine when the load mode is a difficult tunneling mode, so as to obtain monitoring data, where the monitoring data includes a flow peak value and a time history; a coefficient acquisition module 150, configured to determine a dynamic load coefficient according to the monitoring data; the second evaluation module 160 is configured to perform a difficult tunneling mode turntable bearing strength evaluation according to the turntable finite element model and the dynamic load coefficient; the third evaluation module 170 is configured to perform finite element time mileage intensity calculation according to the time history in combination with the excavator planning cutting path, and evaluate the effective lifetime of the turntable according to the calculation result.
The first heading machine turntable bearing strength evaluation system 10 provided according to the present embodiment includes a model building module 110, a mode determining module 120, a first evaluating module 130, a flow monitoring module 140, a coefficient obtaining module 150, a second evaluating module 160, and a third evaluating module 170. The model building module 110 is used for building a turntable finite element model. The mode determination module 120 is configured to determine a load mode of the heading machine based on the work process load characteristics of the heading machine, the load mode including an active heading mode and a hard heading mode. The first evaluation module 130 is configured to obtain an effective tunneling working load when the load mode is an effective tunneling mode, and perform an effective tunneling mode turntable bearing strength evaluation according to the turntable finite element model and the effective tunneling working load. The flow monitoring module 140 is configured to monitor a flow of the hydraulic system of the heading machine when the load mode is a difficult heading mode, so as to obtain monitoring data, where the monitoring data includes a flow peak value and a time history. The coefficient acquisition module 150 is configured to determine the dynamic load coefficient according to the monitoring data. The second evaluation module 160 is used for evaluating the bearing strength of the turntable in the difficult tunneling mode according to the turntable finite element model and the dynamic load coefficient. The third evaluation module 170 is configured to calculate a finite element time mileage intensity according to a time history in combination with a planned cutting path of the excavator, and evaluate the effective lifetime of the turntable according to a calculation result. By evaluating the strength and fatigue capability around the structural bearing strength of the turntable of the tunneling machine, an effective tunneling mode and a difficult tunneling mode evaluation technology are established, and various tunneling load possibilities possibly occurring in the working process of the tunnel tunneling machine can be considered. The strength evaluation capability of the normal rated development machine turntable is judged by the effective development mode, the consideration of margin space safety is effectively carried out based on the design of safety margin, and the optimization can be carried out to a certain extent based on the margin. The calculation method of the difficult tunneling mode considers the structural damage position determination under the overload or dynamic load impact condition, pre-judges the damage possibility in advance, and can complete the fatigue resistance calculation capability of the rotary table by combining the planned tunnel cutting path, thereby being capable of carrying out service life assessment. In the analysis calibration of the actual damage problem of the tunnel boring machine, the matching performance is good, and the result reliability is high.
As shown in fig. 9, an embodiment of the third aspect of the present application provides another second heading machine turret bearing strength assessment system 20, comprising: the steps of the method for evaluating the bearing strength of the heading machine turntable according to any one of the embodiments of the first aspect are implemented when the processor 400 executes the program or the instruction, so that the method has the technical effects of any one of the embodiments of the first aspect and is not described herein.
An embodiment of the fourth aspect of the present application provides a readable storage medium, on which a program or an instruction is stored, where the program or the instruction, when executed by a processor, implements the steps of the method for evaluating bearing strength of a heading machine turret according to any one of the embodiments of the first aspect, so that the method has the technical effects of any one of the embodiments of the first aspect, which are not described herein again.
As shown in fig. 10, according to the method for evaluating the bearing strength of the turntable of the tunneling machine, which is provided by the embodiment of the application, the problem of reasonable calculation of the bearing strength of the turntable of the tunneling machine is solved, and the occurrence of serious quality accidents caused by breakage of the turntable structure is avoided.
The technical solution is adopted in the embodiment:
Determining working load characteristics of a tunneling machine:
the method is characterized in that the calculation classification of the 2-class load states of the heading machine, namely an effective heading mode and a difficult heading mode, is provided for the first time based on the load characteristics of the working process of the heading machine.
The effective tunneling mode considers normal rotation and the lifting oil cylinder to push the cutting head to horizontally and vertically sweep and cut tunnel rock, and the rock serving as a resistance load source is crushed. The structural strength capability is effectively verified in the mode, and the three-way force of the cutting head is reversely calculated based on a mechanical principle and a mechanical rod system method by taking rated pressure of a rotary oil cylinder and a lifting oil cylinder system as a load.
The hard rock cannot be effectively cut by the cutting head of the heading machine in the difficult tunneling mode, the oil cylinder outputs repeated vibration at the moment, the cutting head impacts the cut rock, the effective load source in the difficult tunneling mode is the oil cylinder outputs instantaneous impact oil pressure, and the flow monitoring of a hydraulic system is needed.
Monitoring the flow rate of a hydraulic system:
the method comprises the steps of establishing a monitoring test of a hydraulic system of the tunnel boring machine of the model, monitoring the flow of the hydraulic system, namely the flow signal change process of a rotary and lifting oil cylinder during cutting of a rock wall, determining the flow signal peak value and the flow signal change process of a difficult tunneling mode, and determining the limit working condition and the time sequence load of a rotary table of the tunnel boring machine.
Engineering dynamic load coefficient selection:
And selecting dynamic load coefficients of crushed stones, inquiring a Kw recommended value of the dynamic load coefficient by 2.5-3.5 by using the dynamic load after starting, and determining a reference value of the dynamic load coefficient to finish comparison selection based on a flow monitoring coefficient (peak value/rated value) of the hydraulic system.
The strength calculation method of the tunneling mode rotary table comprises the following steps:
the finite element model of the rotary table is built, and the finite element model comprises an electric appliance box, the rotary table, a body frame, a main rotary bearing, a rotary oil cylinder, a lifting oil cylinder, a high-strength bolt and the like.
Establishing connection relations among the electric box, the rotary table, the body frame and the main rotary bearing which are in contact, binding and bolting of the joint surfaces; and establishing a linear pair and a rotary pair among the rotary table, the body frame and the oil cylinder.
Based on the fact that the effective tunneling mode of the tunneling machine is built, constraint and load application modes are considered, the body frame structure is constrained by the effective tunneling mode, the center position of the load loading cutting head is applied and coupled to the front end surface of the electric box by means of Remote Force, and structural strength assessment is completed.
The difficult tunneling mode constraint and load consider the hard rock tunneling real condition, the center position of the cutting head is constrained in Remote Displacement mode, and the load is applied to the rotary and lifting oil cylinders. The lifting oil cylinder simulates a vertical scanning process, the rotary oil cylinder simulates a horizontal scanning process, and the oil cylinders on two sides realize rotation in a pulling and pushing process. Difficult excavation mode structural strength assessment often fails to meet safety design conditions and is prone to fatigue cracking problems.
The analysis method for the cracking failure process of the rotary table comprises the following steps:
And (3) establishing finite element calculation construction under a difficult tunneling working condition based on a bolt structural form, and completing pretightening force application of the high-strength bolt according to a recommended value of 70% of yield strength of the selected model.
And establishing the nonlinear material plastic property of the bolt.
The SN curve of the turret structure was calculated based on tensile strength using nCode DesignLife.
Based on the time course of the hydraulic system flow monitoring of cutting the rock wall, the transverse scanning and vertical scanning planning path of the tunnel boring machine is combined as a cycle, the finite element time mileage intensity calculation analysis is completed, the finite element time step calculation result is extracted, nCode DesignLife is introduced to complete the accumulated damage of the primary planning path of the tunnel boring machine, and the service life times are estimated.
As shown in fig. 10, the embodiment specifically implements the steps of:
Determining working load characteristics of a tunneling machine:
And determining two types of load modes of the heading machine, namely an effective heading mode and a difficult heading mode based on the rock or coal load characteristics of the working process of the heading machine.
In the effective tunneling mode, the normal rotation and the lifting oil cylinder are considered to push the cutting head to horizontally and vertically sweep and cut tunnel rocks, and the source rocks of the resistance load are crushed.
The cutting head of the heading machine cannot effectively cut hard rock in a difficult tunneling mode, the oil cylinder outputs repeated vibration at the moment, the cutting head impacts the cut rock, the effective load in the difficult tunneling mode sources the oil cylinder to output instantaneous impact oil pressure, and the flow and pressure of a hydraulic system are required to be monitored.
Monitoring the flow rate of a hydraulic system:
The method comprises the steps of establishing a tunnel boring machine hydraulic system monitoring test, adopting a flow sensor to monitor the flow of a hydraulic system of an oil outlet and an oil return port of a rotary oil cylinder and a lifting oil cylinder system, namely establishing a flow signal change process when the rotary oil cylinder cuts a rock wall, and determining a flow signal peak value and a change time sequence load.
Determining a dynamic load coefficient of the ultimate load:
and determining an instantaneous output dynamic load coefficient based on the ratio of the cut rock wall peak value to the rated flow of the monitoring sensing data.
And determining a recommended value of the dynamic load coefficient Kw of 2.0-3.5.
And determining a reference value of the dynamic load coefficient of the rotary oil cylinder and a dynamic load coefficient of the lifting oil cylinder by 2.5 based on the flow monitoring coefficient and the dynamic load coefficient Kw of the hydraulic system.
Constructing a tunneling mode rotary table finite element model:
The finite element simulation assembly model is characterized in that an electric box and a rotary table are connected through a lifting oil cylinder, and a connecting joint is constructed by adopting a hinged kinematic pair;
The rotary table and the main rotary bearing are connected by adopting high-strength bolts, friction contact is established between the joint surfaces, and the contact friction coefficient adopts a recommended value of 0.15;
The main slewing bearing is installed on the body frame structure and is simulated by adopting a binding contact relationship;
the body frame and the rotary table are connected and driven by adopting a rotary oil cylinder, and a connecting joint is constructed by adopting a hinged kinematic pair;
and a linear motion pair is adopted between the cylinder piston and the cylinder cavity for simulation.
The method for calculating the bearing strength comprises the following steps:
Calculating the intensity of an effective tunneling mode of the tunnel boring machine: restraining the bottom end of the body frame structure; the load value is based on the three-way Force of the cutting head under the working condition of reverse thrust rotation and lifting by a hydraulic cylinder mechanical rod system method, and the load is loaded on the center of the cutting head and is applied and coupled to the front end surface of the electric box by utilizing Remote Force.
The intensity calculation of the difficult tunneling mode of the tunnel boring machine: constraint and load consider the real condition of hard rock tunneling. Adopting Remote Displacement to restrain the center position of the cutting head; the load is derived from the instantaneous maximum flow of the rotary and lifting cylinders; applying load by vertically sweeping Cheng Jusheng cylinders, and maintaining pressure by a rotary cylinder; and in the rotation process, the rotation is realized in the matching process of pushing and pulling the oil cylinders on two sides of the rotation oil cylinder on one side, and the lifting oil cylinder maintains pressure. The difficult tunneling mode belongs to the problem that the safety design margin is not usually satisfied in the structure violation operation and fatigue cracking is easy to occur, and the limited service life calculation is needed.
Connecting bolt pretightening force design:
The high-strength bolts of the rotary table are used for determining 10.9 grades, and the pretightening force is calculated according to the (60% -80%) yield strength multiplied by the dangerous section diameter.
The method is characterized in that the plastic characteristic of the nonlinear material of the bolt is established, and the periodic plastic flow is considered by adopting a bilinear equidirectional reinforcement theory.
Calculating the effective life of a difficult tunneling mode:
An SN curve calculation method of the cast steel ZG35CrMo is established, and the calculation method is completed based on a relevant method in German Laoude class (GL) specifications.
A nCode DesignLife-based Time Step cuboid method is adopted to design a fatigue solving engine, a stress combination method is adopted to carry out signed von Mi Saisai stress, and FKM specification correction and the like are selected by an average stress correction method. The FKM specification is a statistical evaluation rule for static strength and fatigue strength of components made of steel, cast iron and aluminum materials according to application conditions of mechanical products in actual engineering by german mechanical engineering research committee, and takes most factors (surface conditions, residual stress, structural details and the like) influencing the strength (static and dynamic) of the components into consideration, so that problems of static strength and fatigue strength of welded and non-welded components can be evaluated by using utilization rates based on a nominal stress method or a local stress method.
Based on the time course of flow monitoring of the hydraulic system for cutting the rock wall, the method combines the planned path of transverse scanning and vertical scanning of the tunnel boring machine as a cycle to complete the calculation and analysis of the finite element time mileage intensity.
And extracting a finite element time step calculation result, introducing nCode DesignLife to complete the accumulated damage of the primary planning path of the tunnel boring machine, and evaluating the service life times.
In summary, the beneficial effects of the embodiment of the application are as follows:
1. The strength and fatigue capacity are evaluated around the bearing strength of the structure of the turntable of the tunneling machine, and various tunneling load possibilities, namely an effective tunneling mode and a difficult tunneling mode, possibly occurring in the working process of the tunneling machine are considered.
2. The strength evaluation capability of the normal rated development machine turntable is judged by the effective development mode, the consideration of margin space safety is effectively carried out based on the design of safety margin, and the optimization design can be carried out to a certain degree based on the margin.
3. The calculation method of the difficult tunneling mode considers the structural damage position determination under the overload or dynamic load impact condition, pre-judges the damage possibility in advance, and completes the fatigue resistance calculation capacity of the rotary table by combining the planned tunnel cutting path to design the effective service life.
4. In the actual damage problem analysis calibration of the tunnel boring machine, the matching performance is high.
In the present application, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more, unless expressly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present application, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or module referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present application.
In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present application, and is not intended to limit the present application, but various modifications and variations can be made to the present application by 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 (8)

1. The method for evaluating the bearing strength of the rotary table of the heading machine is characterized by comprising the following steps of:
establishing a turntable finite element model;
Determining a load mode of the heading machine according to the working process load characteristic of the heading machine, wherein the load mode comprises an effective heading mode and a difficult heading mode;
When the load mode is an effective tunneling mode, acquiring an effective tunneling working load, and evaluating the bearing strength of the turntable in the effective tunneling mode according to the turntable finite element model and the effective tunneling working load;
when the load mode is a difficult tunneling mode, monitoring the flow of a hydraulic system of the tunneling machine to obtain monitoring data, wherein the monitoring data comprises a flow peak value and a time history;
Determining a dynamic load coefficient according to the monitoring data;
carrying out bearing strength evaluation of the turntable in a difficult tunneling mode according to the turntable finite element model and the dynamic load coefficient;
planning a cutting path according to the time history and the excavator, calculating the finite element time mileage intensity, and evaluating the effective life of the rotary table according to a calculation result;
the determining the dynamic load coefficient according to the monitoring data comprises the following steps:
determining an instantaneous output dynamic load coefficient according to the flow peak value and the rated flow ratio;
Acquiring a dynamic load coefficient;
determining a dynamic load coefficient of the rotary oil cylinder and a dynamic load coefficient of the lifting oil cylinder according to the monitoring data and the dynamic load coefficient;
and carrying out difficult tunneling mode turntable bearing strength evaluation according to the turntable finite element model and the dynamic load coefficient, wherein the method comprises the following steps of:
constraining the center position of the cutting head through Remote Displacement;
According to the instantaneous output dynamic load coefficient, load is applied to the rotary oil cylinder and the lifting oil cylinder, and the structural strength evaluation of the difficult tunneling mode is completed;
the step of planning a cutting path according to the time history in combination with the excavator, calculating the finite element time mileage intensity, and evaluating the effective life of the rotary table according to the calculation result comprises the following steps:
Establishing a finite element calculation model of a difficult tunneling working condition based on a bolt structural form, and calculating pretightening force according to yield strength and dangerous section diameter;
Establishing the plasticity characteristics of the nonlinear materials of the bolts;
calculating an SN curve of the turntable structure based on the tensile strength through nCode DesignLife;
according to the time history in the monitoring data, combining the planned path of the transverse scanning and the vertical scanning of the excavator to finish the calculation and analysis of the finite element time mileage intensity and obtain the calculation result of the finite element time step;
Introducing nCode DesignLife the finite element time step calculation result to obtain accumulated damage of the primary planning path of the heading machine, and evaluating the service life times of the rotary table according to the accumulated damage.
2. The method for evaluating the bearing strength of a turntable of a heading machine according to claim 1, wherein the building of the turntable finite element model comprises:
Constructing a rotary table finite element model, wherein the rotary table finite element model comprises an electric box, a rotary table, a body frame, a main rotary bearing, an oil cylinder and a high-strength bolt, and the oil cylinder comprises a rotary oil cylinder and a lifting oil cylinder;
Establishing connection relations among the electric box, the rotary table, the body frame and the main rotary bearing, wherein the connection relations comprise joint surface contact, binding and bolt connection;
and establishing a linear pair and a rotary pair among the rotary table, the body frame and the oil cylinder.
3. The method for evaluating the bearing strength of a turntable of a heading machine according to claim 2, wherein,
The electric appliance box is connected with the rotary table through the lifting oil cylinder, the rotary table is connected with the main rotary bearing through the high-strength bolt, and the body frame is connected with the rotary table through the rotary oil cylinder.
4. The method for evaluating the bearing strength of a turntable of a heading machine according to claim 1, wherein when the load mode is an effective heading mode, an effective heading work load is obtained, and the effective heading mode turntable bearing strength is evaluated according to the turntable finite element model and the effective heading work load, comprising:
When the load mode is an effective tunneling mode, the bottom end of the body frame structure is restrained;
The three-way force of the cutting head based on the hydraulic cylinder mechanical rod system method is reversely pushed to rotate the working condition and lift the working condition, and the effective tunneling working load is obtained according to the three-way force of the cutting head;
and loading the center position of the cutting head according to the effective tunneling working load, and applying and coupling the cutting head to the front end surface of the electric box by utilizing a Remote Force to finish structural strength evaluation of the effective tunneling mode.
5. The method for evaluating the bearing strength of a turntable of a heading machine according to claim 1, wherein when the load mode is a difficult heading mode, flow monitoring is performed on a hydraulic system of the heading machine to obtain monitoring data, the monitoring data including a flow peak value and a time history, and the method comprises the following steps:
when the load mode is a difficult tunneling mode, monitoring the flow signal change process of the rotary oil cylinder and the lifting oil cylinder when cutting a rock wall through a flow sensor, and determining the flow peak value and the time history of the difficult tunneling mode;
and determining the limit working condition and the time sequence load of the rotary table according to the flow peak value and the time history.
6. A first development machine turret bearing strength assessment system, comprising:
the model building module is used for building a turntable finite element model;
The system comprises a mode determining module, a driving module and a driving module, wherein the mode determining module is used for determining a load mode of the tunneling machine according to the working process load characteristic of the tunneling machine, and the load mode comprises an effective tunneling mode and a difficult tunneling mode;
The first evaluation module is used for acquiring an effective tunneling working load when the load mode is an effective tunneling mode, and evaluating the bearing strength of the turntable in the effective tunneling mode according to the turntable finite element model and the effective tunneling working load;
The flow monitoring module is used for monitoring the flow of the hydraulic system of the heading machine when the load mode is a difficult tunneling mode to obtain monitoring data, wherein the monitoring data comprises a flow peak value and a time history;
The coefficient acquisition module is used for determining a dynamic load coefficient according to the monitoring data;
The second evaluation module is used for evaluating the bearing strength of the turntable in the difficult tunneling mode according to the turntable finite element model and the dynamic load coefficient;
The third evaluation module is used for planning a cutting path according to the time history in combination with the excavator, calculating the finite element time mileage intensity and evaluating the effective life of the rotary table according to the calculation result;
the coefficient acquisition module is specifically configured to: determining an instantaneous output dynamic load coefficient according to the flow peak value and the rated flow ratio;
Acquiring a dynamic load coefficient;
determining a dynamic load coefficient of the rotary oil cylinder and a dynamic load coefficient of the lifting oil cylinder according to the monitoring data and the dynamic load coefficient;
The second evaluation module is specifically configured to:
constraining the center position of the cutting head through Remote Displacement;
According to the instantaneous output dynamic load coefficient, load is applied to the rotary oil cylinder and the lifting oil cylinder, and the structural strength evaluation of the difficult tunneling mode is completed;
The third evaluation module is specifically configured to:
Establishing a finite element calculation model of a difficult tunneling working condition based on a bolt structural form, and calculating pretightening force according to yield strength and dangerous section diameter;
Establishing the plasticity characteristics of the nonlinear materials of the bolts;
calculating an SN curve of the turntable structure based on the tensile strength through nCode DesignLife;
according to the time history in the monitoring data, combining the planned path of the transverse scanning and the vertical scanning of the excavator to finish the calculation and analysis of the finite element time mileage intensity and obtain the calculation result of the finite element time step;
Introducing nCode DesignLife the finite element time step calculation result to obtain accumulated damage of the primary planning path of the heading machine, and evaluating the service life times of the rotary table according to the accumulated damage.
7. A second development machine turret bearing strength assessment system, comprising:
a memory (300) and a processor (400), wherein the memory (300) stores a program or instructions executable on the processor (400), the processor (400) implementing the steps of the heading machine turret bearing strength assessment method according to any one of claims 1 to 5 when executing the program or instructions.
8. A readable storage medium having stored thereon a program or instructions which when executed by a processor performs the steps of a method of evaluating the bearing strength of a heading machine turret according to any one of claims 1 to 5.
CN202410391712.4A 2024-04-02 2024-04-02 Development machine turntable bearing strength evaluation method and system and readable storage medium Active CN117972946B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202410391712.4A CN117972946B (en) 2024-04-02 2024-04-02 Development machine turntable bearing strength evaluation method and system and readable storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202410391712.4A CN117972946B (en) 2024-04-02 2024-04-02 Development machine turntable bearing strength evaluation method and system and readable storage medium

Publications (2)

Publication Number Publication Date
CN117972946A CN117972946A (en) 2024-05-03
CN117972946B true CN117972946B (en) 2024-06-07

Family

ID=90861781

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202410391712.4A Active CN117972946B (en) 2024-04-02 2024-04-02 Development machine turntable bearing strength evaluation method and system and readable storage medium

Country Status (1)

Country Link
CN (1) CN117972946B (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101169038A (en) * 2006-10-27 2008-04-30 三一重型装备有限公司 Full automatic tunneling machine
KR20090106257A (en) * 2008-04-04 2009-10-08 한국시설안전공단 Real-time, quantitative stability evaluation method and device for tunnel during construction
JP2020021198A (en) * 2018-07-31 2020-02-06 国際航業株式会社 Stability evaluation method of foundation and computer program for stability evaluation of foundation
CN111783259A (en) * 2020-07-31 2020-10-16 徐州巴特工程机械股份有限公司 Safety assessment method for bucket structure
CN114592865A (en) * 2022-02-25 2022-06-07 三一重型装备有限公司 Control method, device, readable storage medium and roadheader for roadheader
CN115307935A (en) * 2022-08-10 2022-11-08 三一重型装备有限公司 Climbing test device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101169038A (en) * 2006-10-27 2008-04-30 三一重型装备有限公司 Full automatic tunneling machine
KR20090106257A (en) * 2008-04-04 2009-10-08 한국시설안전공단 Real-time, quantitative stability evaluation method and device for tunnel during construction
JP2020021198A (en) * 2018-07-31 2020-02-06 国際航業株式会社 Stability evaluation method of foundation and computer program for stability evaluation of foundation
CN111783259A (en) * 2020-07-31 2020-10-16 徐州巴特工程机械股份有限公司 Safety assessment method for bucket structure
CN114592865A (en) * 2022-02-25 2022-06-07 三一重型装备有限公司 Control method, device, readable storage medium and roadheader for roadheader
CN115307935A (en) * 2022-08-10 2022-11-08 三一重型装备有限公司 Climbing test device

Also Published As

Publication number Publication date
CN117972946A (en) 2024-05-03

Similar Documents

Publication Publication Date Title
Hariri-Ardebili et al. Seismic stability assessment of a high-rise concrete tower utilizing endurance time analysis
CN115081324A (en) A system and method for performance prediction optimization and fault diagnosis of underground engineering equipment
Pakalnis Empirical design methods in practice
CN101675214A (en) Be used to control the method and apparatus of at least one drilling parameter of rock drilling
CN117972946B (en) Development machine turntable bearing strength evaluation method and system and readable storage medium
Muminov et al. Performability of electro-hydro-mechanical rotary head of drill rig in open pit mining: A case-study
Sun et al. Experimental investigation of pick body bending failure
Han et al. Main factors influencing the shear stiffness of circular joints in tunnel segmental linings analyzed by numerical modelling
Likins et al. High strain dynamic pile testing, equipment and practice
Lomate et al. Design and shape optimization of excavator bucket
CN210737657U (en) Scarifier device and engineering vehicle using same
Huang et al. Development of a Real-Time Monitoring and Calculation Method for TBM Disc-Cutter’s Cutting Force in Complex Ground
Karpuz et al. A new method for determining the depth of cut using power shovel monitoring
CN114961762A (en) Construction parameter control method for shield crossing composite stratum
Cheluszka et al. Significance of cutting process parameters as related to improving dynamic state of roadheader and minimizing power consumption
CN112096272A (en) Intelligent drilling method of rock drill
JP4087109B2 (en) Strength evaluation method for excavated objects
Ma et al. Cutting vibration response of a shield-type tunnelling robot system
Sunkpal et al. Coal Rib Geomechanics: A Numerical Approach for the Analysis of Rib Stability in Underground Coal Mines
CN118758576A (en) A working device fatigue life test system and test method
CN119757010B (en) Force measuring device and detection method for rock and soil digability
Motka et al. Development of backhoe machine by 3-D modelling using CAD software and verify the structural design by using finite element method
CN118273413B (en) Energy-saving hydraulic crushing device and use method
CN119323077B (en) Calculation method and system of lateral earth pressure adjacent to foundation pit under the action of tunnel outer ring grouting
CN217419807U (en) Bucket rod structure with oil cylinder protection function

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant