CN114414364A - System and method for testing mechanical strength of ground wire monofilament based on 2D laser - Google Patents
System and method for testing mechanical strength of ground wire monofilament based on 2D laser Download PDFInfo
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The invention provides a system and a method for testing the mechanical strength of a single wire of a ground wire based on 2D laser, wherein the testing system comprises a control module, a data acquisition module, a data analysis module and an operation module, the control module and the data analysis module are both connected with the data acquisition module, the operation module comprises a clamping arm and a laser detection head, and the clamping arm and the laser detection head are both connected with the control module. The test method specifically comprises the steps of obtaining ground wire parameters and stretching energy loss data, determining clamping action data, stretching the ground wire by a clamping arm, collecting clamping force data and deformation displacement data, collecting the state of the ground wire in real time in the stretching process, stopping stretching by the clamping arm when the ground wire is detected to be broken, collecting the broken ground wire parameters by a laser detection head, and calculating the mechanical strength of the ground wire according to the collected data. The invention can effectively reduce the interference of human factors to the test process, ensure the test precision and simultaneously improve the accuracy of the test result.
Description
Technical Field
The invention relates to the technical field of conductive cable detection, in particular to a system and a method for testing the mechanical strength of a single wire of a ground wire based on 2D laser.
Background
Along with the increasing use demand of the conductive cables, domestic manufacturers are more and more, the quality of the produced conductive cables is also uneven, and the condition that all the produced conductive cables can meet the use demand and reach the quality standard cannot be guaranteed. In order to guarantee the operation safety of the power transmission line, the quality of the conductive cable needs to be guaranteed through high-efficiency and high-precision detection, so that the power transmission line fault caused by the quality problem of the conductive cable is prevented. The cable type ground wires are widely applied to power transmission and transformation lines, and due to the large number of the cable type ground wires, when the ground wires are mechanically pulled or excessively bent and wound, and the like, the ground wires are invalid, and the power transmission and transformation lines are subjected to heavy loss, so that the cable type ground wires are very important for testing the mechanical strength of the ground wires. In the prior art, the efficiency is very low during the mechanical property test of the single wire of the ground wire. In the test process, firstly, a micrometer or a digital display vernier caliper is used for measuring the dimension, and if a small-section sample is measured, the measurement result cannot meet the precision requirement. During measurement, the diameter of the monofilament needs to be measured firstly, then the section is calculated, finally the monofilament is installed on an electronic universal testing machine to be stretched, then the result is calculated, the intermediate link has excessive human factor interference, and the accuracy of the test result is not high. When the diameter is measured, the measurement is carried out through a micrometer or a digital display vernier caliper, so that the measurement efficiency is low while the measurement precision is not high.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a system and a method for testing the mechanical strength of a ground wire monofilament based on 2D laser.
The purpose of the invention is realized by the following technical scheme:
a method for testing mechanical strength of a single wire of a ground wire based on 2D laser comprises the following steps:
the method comprises the following steps that firstly, a clamping arm clamps a ground wire to obtain ground wire parameters, and a control module obtains corresponding stretching energy loss data according to the ground wire parameters;
the control module determines clamping action data of the ground wire stretching according to the stretching energy loss data and the ground wire parameters, the clamping arm stretches the ground wire according to the clamping action data, the data acquisition module acquires clamping force data and corresponding deformation displacement data in the stretching process in real time, and the data acquisition module transmits the clamping force data and the corresponding deformation displacement data in the stretching process to the data analysis module in real time;
collecting the state of the ground wire through a laser probe, when the laser probe detects that the ground wire is broken, sending a stretching stopping command to a clamping arm by a control module, stopping stretching of the clamping arm, and collecting parameters of the broken ground wire and feeding the parameters back to a data analysis module by the laser probe;
and fourthly, calculating the mechanical strength of the ground wire by the data analysis module according to the clamping force data, the deformation displacement data and the parameters of the broken ground wire.
Furthermore, the stretching energy loss data corresponding to the ground lead wire is obtained through a ground lead wire stretching simulation model, and the specific process of obtaining the stretching energy loss data by the ground lead wire stretching simulation model is as follows: the method comprises the steps of obtaining the material type of the ground wire, building a metal polycrystalline model according to the material type of the ground wire, building a slow stretching MD simulation model based on the built metal polycrystalline model, setting simulation parameters of the slow stretching MD simulation model, obtaining the corresponding atomic motion state and stress change of the ground wire with a plurality of cross section sizes in the stretching process through the slow stretching MD simulation model, and obtaining corresponding stretching energy loss data according to the atomic motion state and stress change of the ground wire with each cross section size.
Further, the simulation parameters include a boundary condition, a potential function, a temperature, and a time step, and the boundary condition is a periodic boundary condition.
Further, the ground wire parameters comprise the section size of the ground wire, the material of the ground wire and the gauge length, and the clamping action data comprise the stretching speed of the clamping arm.
Further, the cross-sectional dimension of the ground wire is obtained through a laser probe, and the specific process of obtaining the cross-sectional dimension of the ground wire by the laser probe is as follows: the monochromatic laser of laser detecting head launches laser to rotating prism on, drives rotating prism through the motor, and laser passes through rotating prism reflection to transmitting lens, acquires the scanning parallel light band, leads the ground wire and passes through the parallel light band, measures laser and shelters from the time to shelter from the diameter value that time and parallel light band obtained the ground wire through the scanning speed that laser sheltered from time and parallel light band, acquire the cross-sectional dimension who leads the ground wire according to the diameter value.
The utility model provides a lead ground wire monofilament mechanical strength test system based on 2D laser, includes control module, data acquisition module, data analysis module and operating module, control module is connected with data acquisition module, control module is used for controlling the centre gripping arm, data acquisition module is used for gathering the clamping-force data and the deformation displacement data that corresponds of tensile in-process, data analysis module is connected with data acquisition module, data analysis module is used for calculating the mechanical strength who leads the ground wire, operating module includes centre gripping arm and laser detecting head, centre gripping arm and laser detecting head all are connected with control module, the centre gripping arm is used for tensile ground wire, laser detecting head is used for measuring leads ground wire cross sectional dimension, laser detecting head still is used for gathering and leads the ground wire state.
Furthermore, control module includes robust controller and PLC controller, robust controller and PLC controller all are used for controlling the centre gripping arm stopper, robust controller is used for controlling the displacement distance of centre gripping arm, the PLC controller is used for controlling the clamping-force of centre gripping arm.
Further, the data acquisition module comprises a displacement sensor and a clamping force sensor, and the displacement sensor and the clamping force sensor are both arranged on the clamping arm.
The invention has the beneficial effects that:
the action of the clamping arm in the test stretching process is formulated through the ground wire parameters, the ground wires in different sizes can be adjusted, the action of the clamping arm does not need to be formulated manually, and the efficiency of subsequent tests is improved. And the energy loss in the ground wire testing process is also considered in the action control of the clamping arm, the fluctuation in the stretching process caused by the defects on the surface of the ground wire can be reduced by controlling the clamping force of the clamping arm, and the testing precision is further improved. The laser detection head is used for acquiring the parameters of the ground wire, so that compared with the traditional method for measuring by using a micrometer or a digital display vernier caliper, the method can ensure the measuring precision, reduce the interference of human factors in the measuring process and improve the accuracy of the measuring result.
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FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is a schematic flow diagram of the present invention;
wherein: 1. the device comprises a control module 2, a data acquisition module 3, a data analysis module 4, an operation module 41, a clamping arm 42 and a laser probe.
Detailed Description
The invention is further described below with reference to the figures and examples.
Example (b):
A2D laser-based ground wire monofilament mechanical strength testing system is shown in figure 1 and comprises a control module 1, a data acquisition module 2, a data analysis module 3 and an operation module 4, the control module 1 is connected with the data acquisition module 2, the control module 1 is used for controlling the clamping arm 41, the data acquisition module 2 is used for acquiring clamping force data and corresponding deformation displacement data in the stretching process, the data analysis module 3 is connected with the data acquisition module 2, the data analysis module 3 is used for calculating the mechanical strength of the ground wire, the operation module 4 comprises a clamping arm 41 and a laser detection head 42, the clamping arm 41 and the laser detection head 42 are both connected with the control module 1, the clamping arm 41 is used for stretching the ground wire, the laser probe 42 is used for measuring the cross-sectional dimension of the ground wire, and the laser probe 42 is also used for collecting the state of the ground wire.
The control module 1 comprises a robust controller and a PLC (programmable logic controller), wherein the robust controller and the PLC are used for controlling the brake of the clamping arm 41, the robust controller is used for controlling the displacement distance of the clamping arm 41, and the PLC is used for controlling the clamping force of the clamping arm 41.
The data acquisition module 2 comprises a displacement sensor and a clamping force sensor, and the displacement sensor and the clamping force sensor are both arranged on the clamping arm 41.
A method for testing the mechanical strength of a single wire of a ground wire based on 2D laser is shown in figure 2 and comprises the following steps:
firstly, a clamping arm 41 clamps a ground wire to obtain ground wire parameters, and a control module 1 obtains corresponding stretching energy loss data according to the ground wire parameters;
step two, the control module 1 determines the clamping action data of the ground wire stretching according to the stretching energy loss data and the ground wire parameters, the clamping arm 41 stretches the ground wire according to the clamping action data, the data acquisition module 2 acquires clamping force data and corresponding deformation displacement data in the stretching process in real time, and the data acquisition module 2 transmits the clamping force data and the corresponding deformation displacement data in the stretching process to the data analysis module 3 in real time;
step three, acquiring the state of the ground wire through the laser probe 42, when the laser probe 42 detects that the ground wire is broken, sending a stretching stop command to the clamping arm 41 by the control module 1, stopping stretching of the clamping arm 41, and acquiring parameters of the broken ground wire by the laser probe 42 and feeding the parameters back to the data analysis module 3;
and fourthly, the data analysis module 3 calculates the mechanical strength of the ground wire according to the clamping force data, the deformation displacement data and the parameters of the broken ground wire.
When the clamping arm 41 clamps the ground wire, the parameters of the ground wire are directly obtained, and compared with the size measurement before clamping, the interference of manual intervention on the test result can be reduced as much as possible, and the accuracy of the test result is improved. And the state of the lead wire is detected in real time through the laser detection head 42, when the fracture condition occurs, the stretching of the clamping arm 41 can be stopped in time, and the current state of the lead wire and the ground wire is recorded, so that the calculation accuracy of the mechanical strength of the lead wire and the ground wire is ensured.
The method comprises the following steps that the stretching energy loss data corresponding to the ground wire is obtained through a ground wire stretching simulation model, and the specific process of obtaining the stretching energy loss data through the ground wire stretching simulation model is as follows: the method comprises the steps of obtaining the material type of the ground wire, building a metal polycrystalline model according to the material type of the ground wire, building a slow stretching MD simulation model based on the built metal polycrystalline model, setting simulation parameters of the slow stretching MD simulation model, obtaining the corresponding atomic motion state and stress change of the ground wire with a plurality of cross section sizes in the stretching process through the slow stretching MD simulation model, and obtaining corresponding stretching energy loss data according to the atomic motion state and stress change of the ground wire with each cross section size.
The simulation parameters comprise boundary conditions, potential functions, temperature and time steps, and the boundary conditions are periodic boundary conditions. The boundary conditions of the slow stretching MD simulation model in all directions are set as periodic boundary conditions, and because the established slow stretching MD simulation model and the sample adopted by the actual slow stretching are not necessarily in a scale range, when the scale range of the model is small, the proportion of atoms at the boundary in the whole system is large, and the atoms have important influence on the deformation mechanism of the model in the slow stretching process. In order to solve the problem, a periodic boundary condition is introduced, which is equivalent to adding an infinite number of virtual atoms at the periphery of the boundary, and when the motion state of the boundary atoms is calculated, the action of the virtual atoms on the boundary atoms is considered, so that the influence of the boundary effect on the calculation result is removed. In the MD simulation, the acting force is regarded as a constant in each time step to solve the motion state of the system atom, and the time step cannot be set too large in order to ensure the accuracy of the simulation result.
A metal single crystal model was created by LAMMPS (Large-scale Atomic/Molecular Massively Parallel Simulator).
The change rule of the energy loss of the metal materials with different section sizes in the slow stretching process can be found out through the slow stretching MD simulation model, and energy loss data can be provided for the subsequent action formulation of the clamping arm 41, so that the action of the clamping arm 41 is controlled more accurately, and the accuracy of the mechanical strength test result of the ground wire is improved.
The ground wire parameters comprise the section size of the ground wire, the material of the ground wire and the gauge length, and the clamping action data comprise the stretching speed of the clamping arm 41.
The cross-sectional dimension and gauge length of the ground wire are measured and updated by the laser probe 42 in real time.
The laser detector 42 includes a light emitting source and a receiving device, a cable to be detected is arranged between the light emitting source and the receiving device, the light emitting source includes a monochromatic laser, a rotating prism and an emitting lens, and the rotating prism is located at the focal point of the emitting lens. The receiving device then serves to analyze the occlusion time.
The laser detection head 42 is used for acquiring the section size of the ground wire, and the specific process of acquiring the section size of the ground wire by the laser detection head 42 is as follows: laser probe 42's monochromatic laser emission laser drives rotating prism through the motor on rotating prism, and laser passes through rotating prism reflection to transmitting lens, acquires the scanning parallel light band, leads the ground wire and passes through the parallel light band, measures laser and shelters from the time to shelter from the diameter value that the diameter value of ground wire was obtained to the scanning speed that shelters from time and parallel light band through laser, acquires the cross-sectional dimension who leads the ground wire according to the diameter value. The diameter value is obtained by multiplying the occlusion time by the scan speed of the parallel band of light.
When the laser probe 42 performs scanning measurement, the ground wire is in an advancing state, which results in that the section of the ground wire measured by scanning is not a circular section but an oblique section, so that the scanning speed is set to be more than 200m/s, and the running speed of the ground wire to be measured is far lower than the scanning speed, thereby reducing the influence.
The ground wire is placed on the clamping arm 41, and then the cross section dimension is measured through the laser probe 42, so that the interference of manual participation in the test process can be effectively reduced, and the accuracy of the test result is ensured.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (8)
1. A method for testing mechanical strength of a single wire of a ground wire based on 2D laser is characterized by comprising the following steps:
the method comprises the following steps that firstly, a clamping arm clamps a ground wire to obtain ground wire parameters, and a control module obtains corresponding stretching energy loss data according to the ground wire parameters;
the control module determines clamping action data of the ground wire stretching according to the stretching energy loss data and the ground wire parameters, the clamping arm stretches the ground wire according to the clamping action data, the data acquisition module acquires clamping force data and corresponding deformation displacement data in the stretching process in real time, and the data acquisition module transmits the clamping force data and the corresponding deformation displacement data in the stretching process to the data analysis module in real time;
collecting the state of the ground wire through a laser probe, when the laser probe detects that the ground wire is broken, sending a stretching stopping command to a clamping arm by a control module, stopping stretching of the clamping arm, and collecting parameters of the broken ground wire and feeding the parameters back to a data analysis module by the laser probe;
and fourthly, calculating the mechanical strength of the ground wire by the data analysis module according to the clamping force data, the deformation displacement data and the parameters of the broken ground wire.
2. The method for testing the mechanical strength of the ground wire monofilament based on the 2D laser as claimed in claim 1, wherein the tensile energy loss data corresponding to the ground wire is obtained through a ground wire tensile simulation model, and the specific process of obtaining the tensile energy loss data by the ground wire tensile simulation model is as follows: the method comprises the steps of obtaining the material type of the ground wire, building a metal polycrystalline model according to the material type of the ground wire, building a slow stretching MD simulation model based on the built metal polycrystalline model, setting simulation parameters of the slow stretching MD simulation model, obtaining the corresponding atomic motion state and stress change of the ground wire with a plurality of cross section sizes in the stretching process through the slow stretching MD simulation model, and obtaining corresponding stretching energy loss data according to the atomic motion state and stress change of the ground wire with each cross section size.
3. The method as claimed in claim 2, wherein the simulation parameters include boundary conditions, potential functions, temperature and time steps, and the boundary conditions are periodic boundary conditions.
4. The method for testing the mechanical strength of the ground wire monofilament based on the 2D laser as claimed in claim 1, wherein the ground wire parameters include the section size of the ground wire, the material of the ground wire and the gauge length, and the clamping action data includes the stretching rate of the clamping arm.
5. The method for testing the mechanical strength of the ground wire monofilament based on the 2D laser as claimed in claim 4, wherein the cross-sectional dimension of the ground wire is obtained by a laser probe, and the specific process of obtaining the cross-sectional dimension of the ground wire by the laser probe is as follows: the monochromatic laser of laser detecting head launches laser to rotating prism on, drives rotating prism through the motor, and laser passes through rotating prism reflection to transmitting lens, acquires the scanning parallel light band, leads the ground wire and passes through the parallel light band, measures laser and shelters from the time to shelter from the diameter value that time and parallel light band obtained the ground wire through the scanning speed that laser sheltered from time and parallel light band, acquire the cross-sectional dimension who leads the ground wire according to the diameter value.
6. The utility model provides a lead ground wire monofilament mechanical strength test system based on 2D laser, its characterized in that, includes control module, data acquisition module, data analysis module and operating module, control module is connected with data acquisition module, control module is used for controlling the centre gripping arm, data acquisition module is used for gathering tensile in-process clamping-force data and the deformation displacement data that corresponds, data analysis module is connected with data acquisition module, data analysis module is used for calculating the mechanical strength who leads the ground wire, operating module includes centre gripping arm and laser detecting head, centre gripping arm and laser detecting head all are connected with control module, the centre gripping arm is used for tensile ground wire, laser detecting head is used for measuring leads ground wire cross-sectional dimension, laser detecting head still is used for gathering the ground wire state.
7. The system of claim 6, wherein the control module comprises a robust controller and a PLC controller, the robust controller and the PLC controller are used for controlling the clamping arm brake, the robust controller is used for controlling a displacement distance of the clamping arm, and the PLC controller is used for controlling a clamping force of the clamping arm.
8. The system for testing mechanical strength of a ground wire and monofilament based on a 2D laser as claimed in claim 6, wherein the data acquisition module comprises a displacement sensor and a clamping force sensor, and the displacement sensor and the clamping force sensor are both arranged on the clamping arm.
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