CN117870567A - A wire strain measurement method and system - Google Patents

Abstract

The application relates to a wire strain measurement method and system, and relates to the field of material performance testing technology, wherein the method comprises the steps of obtaining a test wire image, the whole length of a wire, the end position of the wire and the grabbing position of the wire; determining a wire test length according to the whole length and the blank length of the wire, and determining a wire feeding position according to the wire test length, the wire grabbing position and the clamp mounting position; determining the density of the test wires according to the test wire images, and determining the original cross-sectional area of the wires and the original width of the wires according to the platform detection weight, the whole length of the wires and the density of the test wires; and controlling the material taking assembly to move to a wire grabbing position to clamp the wire, moving to a wire feeding position control clamp to clamp the wire, controlling the clamp to move back to the wire fracture after clamping to obtain the final fracture length instantly, and calculating and determining the elongation and the reduction of area. The wire strain measurement test device has the effect of improving the overall effect of the wire strain measurement test.

Description

A wire strain measurement method and system

Technical Field

The present application relates to the field of material performance testing technology, and in particular to a wire strain measurement method and system.

Background technique

As various products develop towards lightweight and miniaturization, the determination of ductility such as elongation and cross-sectional shrinkage of metal wires has become very important. At present, material displacement and strain are mainly measured by extensometers. The staff clamps the two ends of the wire to be measured on the fixture of the extensometer, and then controls the two ends of the fixture to move back and forth to stretch the wire until the wire breaks. The elongation is calculated based on the length of the wire at the time of break, and the end shrinkage is calculated based on the fracture cross section at the time of break.

Regarding the above-mentioned related technologies, when measuring wire strain, workers are required to manually install the wire, which not only increases the workload of the workers, but also may cause inaccurate clamping positions and lead to inaccurate test results, resulting in poor overall effect of the wire strain measurement test. There is still room for improvement.

Summary of the invention

In order to improve the overall effect of a wire strain measurement test, the present application provides a wire strain measurement method and system.

In a first aspect, the present application provides a wire strain measurement method, which adopts the following technical solution:

A wire strain measurement method, comprising:

Obtain the platform detection weight of the preset placement platform;

When the platform detection weight is greater than the preset reference weight, a real-time image of the platform is obtained, and a comparison analysis is performed based on the real-time image of the platform and the preset original image to determine the test wire image, the overall length of the wire, the end position of the wire, and the wire grabbing position;

The wire test length is determined by calculation based on the overall length of the wire and the preset blank length, and the wire feeding position is determined by calculation based on the wire test length, the wire grabbing position and the preset fixture installation position;

Input the test wire image into the preset material database for matching analysis to determine the test wire density, and calculate the original cross-sectional area and original width of the wire according to the platform detection weight, the overall length of the wire and the test wire density;

Determine the permissible clamping force range corresponding to the original width of the wire according to the preset range matching relationship;

Control the preset material taking component to move to the wire grabbing position to clamp the wire, and control the material taking component to move to the wire loading position after clamping, and control the material taking component to rotate in the process of moving to the wire loading position so that the wire is vertically downward, and control the clamp to clamp the wire with a random clamping force within the allowable clamping force range after the material taking component moves to the wire loading position, and control the clamp to move backward after clamping to obtain the wire detection status in real time;

When the wire detection state is consistent with the preset fracture state, the final fracture length of the wire at the moment of fracture is obtained, and the fracture cross-sectional area of the wire is calculated according to the final fracture length;

The elongation is determined by calculation based on the final breaking length and the test length of the wire, and the reduction of area is determined by calculation based on the original cross-sectional area of the wire and the cross-sectional area of the wire at break;

After the test wire image is determined, the wire strain measurement method further includes:

Counting is performed based on the test wire image to determine the number of test wires;

Determine whether the number of test wires is one;

If the number of the test wires is one, the material taking component is controlled to clamp the wire to the fixture to control the fixture to move backward;

If the number of test wires is not one, the permissible clamping force range of each wire is obtained, and wires with overlapping permissible clamping force ranges are classified into the same set to determine a common processing set;

Counting the wires in the common processing set to determine the number of the set wires, and determining the number of the set wires with the largest value according to a preset sorting rule, and defining the number of the set wires as the number of detection wires, and defining the common processing set corresponding to the number of detection wires as the stress test set;

The overlapped part of the allowable clamping force range corresponding to each wire in the stress test set is defined as the available clamping force range, and the clamping force to be used is determined within the available clamping force range, and the sampling assembly controlling the number of wires to be tested clamps each wire in the stress test set into the clamp respectively, and controls the clamp to clamp the wire using the clamping force;

After the number of wires is determined, the wire strain measurement method further includes:

Determine whether there are at least two common processing sets with the same and largest number of wire materials;

If there are not at least two common processing sets with the same and largest number of wire materials, the only common processing set is determined as the stress test set;

If there are at least two common processing sets with the same and largest number of wires, the corresponding common processing sets are defined as candidate processing sets, and the overall length of the wires with the smallest value is determined in the candidate processing sets according to the sorting rule, and the overall length of the wires is defined as the lower limit overall length;

Performing a difference calculation based on the overall length of each wire in the candidate processing set and the lower limit overall length to determine the local deviation length, and performing a sum calculation based on all the local deviation lengths to determine the overall deviation length;

The overall deviation length with the smallest value is determined according to the sorting rule, and the candidate processing set corresponding to the overall deviation length is defined as the stress test set.

By adopting the above technical solution, when conducting a wire strain measurement test, the staff will place the wire on the placement platform at will. At this time, the system will automatically obtain part of the information of the wire through visual recognition technology. At this time, the wire can be automatically moved to the fixture through the sampling component. Not only does the staff not need to manually install the wire, but the clamping position of the wire by the fixture is more accurate, so as to improve the overall effect of the test; when there are multiple wires that need to be measured, the wire conditions are analyzed to test multiple wires at one time as much as possible, so as to improve the overall efficiency of the test; when there are multiple common processing sets that meet the requirements, the common processing sets can be screened to determine a unique stress test set.

Optionally, the step of controlling the sampling assembly for testing the number of wires to clamp each wire in the stress test set into a fixture includes:

In the stress test set, the wire on the placement platform intersecting with the other wires is defined as a contact wire, and the other wires are defined as independent wires;

In the contact wires, the contact wires are analyzed according to the test wire images to determine the contact picking order of each contact wire, and the contact wire at the front of the contact picking order and the independent wire are defined as the sorting wires;

Determine the influence area by the wire grabbing position of any sorted wire and the preset influence distance, and make any combination among the sorted wires to determine the random wire combination;

The random wire combination when the influence areas of the wires corresponding to the random wire combination do not have overlapping areas is defined as an optional wire combination, and the optional wire combination with the largest number of wires is defined as a used wire combination, and the random wire combination is updated according to the remaining wires other than the used wire combination to continue to determine the used wire combination until all the sorted wires are included in the used wire combination;

The overall picking order is determined according to the order of using the wire material combinations and the contact picking order, and the material picking component is controlled to clamp each wire material into the clamp according to the overall picking order.

By adopting the above technical solution, the order in which the wires are placed on the clamp can be determined, so that the material taking component can take and process the wires in an orderly manner.

Optionally, after the overall taking order is determined, the wire strain measurement method further includes:

The wire at the end of the overall picking sequence is defined as the rear wire, and the wire loading position corresponding to the rear wire is defined as the initial loading position;

Calculate and update the wire loading position of each wire according to the initial loading position, the overall picking order and the preset safety distance;

Each material taking assembly is controlled to move to a corresponding wire material loading position to clamp the wire material in the fixture.

By adopting the above technical solution, the specific clamping position of the wire is updated to ensure that the wire can be tested normally.

Optionally, the method for determining the clamping force to be used within the available clamping force range includes:

Generate a virtual clamping force that can be randomly changed within the available clamping force range;

The central clamping force is determined according to the permissible clamping force range of each wire material, and the deviation clamping force is determined by performing a difference calculation based on the virtual clamping force and the central clamping force;

Calculation is performed based on all the deviation clamping forces to determine the deviation degree value, and the deviation degree value with the smallest value is determined based on the sorting rule, and the virtual clamping force corresponding to the deviation degree value is defined as the used clamping force.

By adopting the above technical solution, the most appropriate virtual clamping force is determined for use, so that the clamp has a better clamping effect on the wire during the test and reduces the sliding of the wire relative to the clamp during the backward movement of the clamp.

In a second aspect, the present application provides a wire strain measurement system, which adopts the following technical solution:

A wire strain measurement system, comprising:

An acquisition module, used for acquiring a preset platform detection weight of a placement platform;

A processing module, connected to the acquisition module and the judgment module, for storing and processing information;

A judgment module, connected with the acquisition module and the processing module, for judging the information;

When the judging module judges that the platform detection weight is greater than the preset reference weight, the acquiring module acquires the platform real-time image, and enables the processing module to compare and analyze the platform real-time image and the preset original image to determine the test wire image, the overall length of the wire, the end position of the wire and the wire grabbing position;

The processing module calculates the wire test length according to the overall length of the wire and the preset blank length, and calculates the wire feeding position according to the wire test length, the wire grabbing position and the preset fixture installation position;

The processing module inputs the test wire image into a preset material database for matching analysis to determine the test wire density, and calculates the original cross-sectional area and original width of the wire according to the platform detection weight, the overall length of the wire and the test wire density;

The processing module determines the permissible clamping force range corresponding to the original width of the wire according to a preset range matching relationship;

The processing module controls the preset material picking component to move to the wire grabbing position to clamp the wire, and controls the material picking component to move to the wire loading position after clamping, and controls the material picking component to rotate in the process of moving to the wire loading position so that the wire is vertically downward, and controls the clamp to clamp the wire with a random clamping force within the allowable clamping force range after the material picking component moves to the wire loading position, and controls the clamp to move backward after clamping to obtain the wire detection status in real time;

When the judging module judges that the wire material detection state is consistent with the preset fracture state, the obtaining module obtains the final fracture length of the wire material at the moment of fracture, and enables the processing module to calculate the fracture cross-sectional area of the wire material according to the final fracture length;

The processing module calculates the elongation according to the final breaking length and the test length of the wire material, and calculates the cross-sectional shrinkage according to the original cross-sectional area of the wire material and the broken cross-sectional area of the wire material;

The post-processing module determines the number of test wires by counting the test wire images;

The judging module judges whether the number of the test wires is one;

If the judging module judges that the number of the test wires is one, the processing module controls the material taking component to clamp the wires to the fixture to control the fixture to move backward;

If the judging module judges that the number of the test wires is not one, the obtaining module obtains the permissible clamping force range of each wire, and causes the processing module to classify the wires with overlapping permissible clamping force ranges into the same set to determine a common processing set;

The processing module counts the wires in the common processing set to determine the number of the set wires, and determines the number of the set wires with the largest value according to a preset sorting rule, and defines the number of the set wires as the number of detection wires, and defines the common processing set corresponding to the number of detection wires as the stress test set;

The processing module defines the overlapped part of the allowable clamping force range corresponding to each wire in the stress test set as the available clamping force range, determines the clamping force to be used within the available clamping force range, and controls the sampling component of the number of wires to be tested to clamp each wire in the stress test set into the clamp, and controls the clamp to clamp the wire using the clamping force;

After the number of the assembled wires is determined, the determination module determines whether there are at least two common processing sets with the same and largest number of assembled wires;

If the judging module judges that there are not at least two common processing sets with the same number of wire materials and the largest number, the processing module determines the only common processing set as the stress test set;

If the judging module judges that there are at least two common processing sets with the same and largest number of wires, the processing module defines the corresponding common processing set as an alternative processing set, and determines the wire overall length with the smallest value in the alternative processing set according to the sorting rule, and defines the wire overall length as the lower limit overall length;

The processing module performs a difference calculation based on the overall length of each wire in the candidate processing set and the lower limit overall length to determine the local deviation length, and performs a sum calculation based on all the local deviation lengths to determine the overall deviation length;

The processing module determines the overall deviation length with the smallest value according to the sorting rule, and defines the candidate processing set corresponding to the overall deviation length as the stress test set.

By adopting the above technical solution, when conducting a wire strain measurement test, the staff will place the wire on the placement platform at will. At this time, the system will automatically obtain some information about the wire through visual recognition technology. At this time, the wire can be automatically moved to the fixture through the sampling component. Not only does the staff not need to manually install the wire, but the fixture can also hold the wire more accurately, thereby improving the overall effect of the test.

In summary, the present application includes at least one of the following beneficial technical effects:

During the wire test, all intelligent settings are used to reduce the workload of the staff, and the wire clamping position is more accurate, which improves the overall effect of the wire stress measurement test;

When multiple wires need to be measured, the wire conditions are analyzed to allow as many wires as possible to be measured at one time, thus improving the overall test efficiency.

When multiple wires are tested for measurement, the wires can be moved to the fixture for tightening according to the specific conditions of the wires to improve the stability of the wire test.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a flow chart of a wire strain measurement method.

FIG. 2 is a flow chart of a multi-wire material test control method.

FIG. 3 is a flow chart of a common processing set screening processing method.

FIG. 4 is a flow chart of a wire clamping control method.

FIG. 5 is a flow chart of a method for updating a wire feeding position.

FIG. 6 is a flow chart of a method for determining the clamping force used.

FIG. 7 is a module flow chart of a wire strain measurement method.

Detailed ways

In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with Figures 1 to 7 and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

The embodiments of the present application are further described in detail below in conjunction with the drawings in the specification.

The embodiment of the present application discloses a wire strain measurement method. When conducting a strain measurement test on a wire, a staff member places the wire to be tested on a placement platform. At this time, the system can automatically analyze the wire on the placement platform to install as many wires as possible on a fixture at a time for testing. This method has a high degree of automation and a better overall test effect.

1 , the method flow of the wire strain measurement method includes the following steps:

Step S100: obtaining a preset platform detection weight of a placement platform.

The placement platform is a platform for workers to place wire materials that need to be stress-measured. The platform detection weight is the weight of an external object placed on the placement platform, which can be obtained by installing a weight detection sensor under the placement platform.

Step S101: when the platform detection weight is greater than the preset reference weight, a real-time image of the platform is obtained, and a comparison analysis is performed based on the real-time image of the platform and the preset original image to determine the test wire image, the overall length of the wire, the end position of the wire and the wire grabbing position.

The reference weight is the weight set by the staff to determine that there is wire to be tested on the placement platform. When the platform detection weight is greater than the reference weight, it means that there is wire placed on the placement platform. The platform real-time image is the image of the entire placement platform obtained by the camera installed directly above the platform and shooting downward in the current situation. The original image is the image when there is no wire on the placement platform. The test wire image is the image of the wire placed on the placement platform. The overall length of the wire is the total length of the wire. The end position of the wire is the position of the two ends of the wire length on the placement platform. The wire grasping position is the center point position of the wire in the length direction. The image comparison and analysis method is machine vision recognition, and the corresponding recognition model can be established in advance by establishing a corresponding neural learning network.

Step S102: Calculate the wire test length according to the overall length of the wire and the preset blank length, and calculate the wire feeding position according to the wire test length, the wire grabbing position and the preset fixture installation position.

The blank length is the fixed length preset by the staff for the clamp to clamp the wire. The wire test length is the length of the wire used for stretching, that is, the length obtained by subtracting two blank lengths from the overall length of the wire. The fixture installation position is the coordinate position of the fixture on the extensometer in three-dimensional space. The wire feeding position is the position point where the material collection component is required to be when the wire can be tightened by the clamp and clamped by the blank length. According to the wire grabbing position and the wire test length, the required distance value between the sampling component and the clamp in the height direction can be obtained, and then the wire feeding position can be determined according to the fixture installation position.

Step S103: input the test wire image into a preset material database for matching analysis to determine the test wire density, and calculate according to the platform detection weight, the overall length of the wire and the test wire density to determine the original cross-sectional area and the original width of the wire.

The test wire density is the density of the wire that currently needs to be tested. The material database is a database that records the density of wires of various materials. The wire material can be determined by visual recognition, and then the corresponding density can be obtained through the corresponding database. When the corresponding density cannot be identified, a corresponding unidentified signal can be issued. At this time, the staff who places the wire needs to manually input the wire density; the original cross-sectional area of the wire is the cross-sectional area of the wire, which is calculated and obtained by the formula S ₀ =(1000* m ₀ )/( ρ * L ₀ ), where S ₀ is the original cross-sectional area of the wire, m ₀ is the weight of the wire, that is, the platform detection weight obtained previously, ρ is the test wire density, and L ₀ is the overall length of the wire; the original width of the wire is the width required when the wire is clamped, that is, the cross-sectional diameter of the wire, and the cross-sectional area of the wire can be calculated and determined as a circle.

Step S104: determining the permissible clamping force range corresponding to the original width of the wire according to a preset range matching relationship.

The allowable clamping force range is the range of clamping force that needs to be added to the wire when the wire basically does not move relative to the clamp after the clamp clamps the wire and performs a stretching operation. At the same time, the clamping force within this range will not cause the wire to deform before further stretching, so as to reduce the occurrence of inaccurate wire strain measurement. Therefore, different original wire widths correspond to different allowable clamping force ranges, and the range matching relationship between the two is determined by the staff in advance through multiple tests.

Step S105: Control the preset material picking component to move to the wire grabbing position to clamp the wire, and control the material picking component to move to the wire loading position after clamping, and control the material picking component to rotate so that the wire moves vertically downward during the process of moving to the wire loading position, and control the clamp to clamp the wire with a random clamping force within the allowable clamping force range after the material picking component moves to the wire loading position, and control the clamp to move backward after clamping to obtain the wire detection status in real time.

The material picking component is a material moving component that can move the wire from the placement platform to the clamp, which can be achieved through a combination of a mechanical clamp and a sliding module. After the wire is clamped by the material picking component, the starting point of rotation is determined according to half the length of the wire, so as to reduce the bending and deformation caused by the contact between the wire and the placement platform after the rotation of the material picking component. When the material picking component moves to the wire loading position, the clamp can be controlled to clamp the wire with a random clamping force within the allowable clamping force range, and the two clamps can be controlled to move back to back to achieve the stretching of the wire. The wire detection state is the state of the wire during the stretching operation, including the state when it is broken and the state when it is not broken. The corresponding wire detection state can be determined by identifying the integrity of the wire image.

Step S106: when the wire detection state is consistent with the preset fracture state, the final fracture length of the wire at the moment of fracture is obtained, and the fracture cross-sectional area of the wire is calculated according to the final fracture length.

The fracture state refers to the state of the wire when it breaks. When the wire detection state is consistent with the fracture state, it means that the wire has been broken. At this time, the elongation and cross-sectional shrinkage rate can be calculated. The final fracture length is the distance between the clamps at the moment of wire fracture. The wire fracture cross-sectional area is the area of the fracture cross-section when the wire breaks. It can be determined by the above cross-sectional area calculation formula. It should be noted that the corresponding wire weight needs to be converted and determined according to the wire test length and the overall length of the wire.

Step S107: Calculate the elongation according to the final breaking length and the wire test length, and calculate the cross-sectional shrinkage according to the original cross-sectional area of the wire and the broken cross-sectional area of the wire.

The elongation of the wire can be determined by dividing the test length of the wire by the final breaking length, and the reduction of area can be determined by dividing the broken cross-sectional area of the wire by the original cross-sectional area of the wire.

2 , after the test wire image is determined, the wire strain measurement method further includes:

Step S200: counting the test wire images to determine the number of the test wires.

The number of test wires is the number of currently determined test wire images, that is, the number of independent wires placed on the placement platform, which can be determined by counting the number of determined test wire images one by one.

Step S201: determining whether the number of test wires is one.

The purpose of the judgment is to know whether it is necessary to conduct a measurement test of multiple wire materials at present.

Step S2011: If the number of the test wire is one, the material taking assembly is controlled to clamp the wire to the fixture to control the fixture to move backward.

When the number of test wires is one, it means that only one wire needs to be tested, and the test can be performed normally.

Step S2012: If the number of the test wires is not one, obtain the permissible clamping force range of each wire, and classify the wires with overlapping permissible clamping force ranges into the same set to determine a common processing set.

When the number of test wires is not one, it means that the staff needs to conduct measurement tests on multiple wires, and further analysis is required at this time; it should be noted that when multiple wires need to be measured, the staff still needs to place them one by one on the placement platform in sequence, so that the weight of each wire can be determined according to the change in weight difference, and the weight obtained after the weight change is updated to the reference weight, and the acquired image is updated to the original image, so that the test wire image of each wire can be effectively determined; the allowable clamping force range of the wires in the common processing set must have partial overlap, so that the wires in the set can be clamped by the clamp at the same time, so as to further illustrate that the wires in the set can be tested at the same time, and due to the different corresponding allowable clamping force ranges, one wire can be included in different common processing sets at the same time.

Step S202: Count the wires in the common processing set to determine the number of wires in the set, determine the number of wires in the set with the largest value according to a preset sorting rule, define the number of wires in the set as the number of detection wires, and define the common processing set corresponding to the number of detection wires as the stress test set.

The number of wires in a collection is the total number of wires in a jointly processed collection. The sorting rule is a method set by the staff to sort the numerical values, such as a bubble sort method. The sorting rule can be used to determine the number of wires in a collection with the largest numerical value, that is, the number of wires measured when the wires in the collection are processed simultaneously is the largest. The number of wires to be tested is defined to determine the number of wires in different collections, and the test collection is defined to distinguish different jointly processed collections, which is convenient for subsequent analysis steps.

Step S203: define the overlapping part of the allowable clamping force range corresponding to each wire in the stress test set as the available clamping force range, determine the clamping force to be used within the available clamping force range, and control the sampling component of the number of wires to be tested to clamp each wire in the stress test set into the clamp respectively, and control the clamp to clamp the wire using the clamping force.

The available clamping force range is defined to determine the range of clamping force applied by the clamp that meets the requirements, and at the same time, the clamping force used is determined within the available clamping force range so that the clamp can effectively clamp the wire, so that multiple wires can operate at the same time, wherein the clamping force used can be determined by setting a random algorithm, and can also be determined by analyzing the specific situation of the clamping force. The method used in this embodiment is described below and will not be repeated here.

3 , after the number of wires in the set is determined, the wire strain measurement method further includes:

Step S300: determining whether there are at least two common processing sets with the same and largest number of wire materials.

The purpose of the judgment is to find out whether there are multiple common processing sets that meet the requirements.

Step S3001: If there are not at least two common processing sets with the same number of wires and the largest number, then the only common processing set is determined as the stress test set.

When there are not at least two common processing sets with the same number of wire materials and the largest number, it means that there are not multiple common processing sets that meet the requirements. At this time, the subsequent steps can be executed according to the only determined common processing set that meets the requirements.

Step S3002: If there are at least two common processing sets with the same and largest number of wires, the corresponding common processing sets are defined as candidate processing sets, and the overall length of the wires with the smallest value is determined in the candidate processing sets according to the sorting rule, and the overall length of the wires is defined as the lower limit overall length.

When there are at least two common processing sets with the same and largest number of wires, it means that there are multiple common processing sets that meet the requirements. At this time, the common processing sets need to be further screened and processed; alternative processing sets are defined to distinguish different common processing sets. Since the initial distance between the fixtures needs to be determined by the shortest wire when multiple wires are tested at the same time, the lower limit overall length is defined to distinguish the overall lengths of different wires, which is convenient for subsequent analysis.

Step S301: performing difference calculation between the overall length of each wire in the candidate processing set and the lower limit overall length to determine a local deviation length, and performing sum calculation based on all the local deviation lengths to determine an overall deviation length.

The local deviation length is the length value obtained by subtracting the lower limit overall length from the overall length of the wire, and the overall deviation length is the length value obtained by summing up the local deviation lengths obtained by processing each wire in the set together.

Step S302: determining the overall deviation length with the smallest value according to the sorting rule, and defining the candidate processing set corresponding to the overall deviation length as the stress test set.

The sorting rule can be used to obtain the overall deviation length with the smallest value, that is, the deviation between the length of the wire when stretched and the theoretically required length is the smallest, that is, the overall effect is better when the wire in this set is tested. Therefore, the alternative processing set is defined as a stress test set so that the wire in this alternative processing set can be measured and tested.

4 , the steps of controlling the sampling assembly for detecting the number of wires to clamp each wire in the stress test set into a fixture include:

Step S400: in the stress test set, a wire on the placement platform intersecting with other wires is defined as a contact wire, and the other wires are defined as independent wires.

Whether there is an intersection can be determined by image analysis, and the contact wires and independent wires can be defined to facilitate subsequent analysis of whether the wires can be directly taken by the material removal component.

Step S401: analyzing the test wire image among the contact wires to determine the contact picking sequence of each contact wire, and defining the front contact wire and the independent wire in the contact picking sequence as the sorting wire.

The contact picking order is the picking order of each contact wire. The upper and lower positions of the wires can be determined by image analysis. The wires at the top are picked up earlier, and the wires at the bottom are picked up later. The contact wires at the front of the contact picking order and the independent wires can be picked up by the first sampling component. At this time, the sorting wires are defined to facilitate subsequent analysis.

Step S402: determining an influence area based on a wire grabbing position of any sorted wire and a preset influence distance, and performing any combination among the sorted wires to determine a random wire combination.

The impact distance is the minimum distance set by the staff when the sampling components will interfere. According to the wire sampling position and the impact distance, it can be known that the sampling component will affect the impact area of other sampling components; the random wire combination is a combination composed of any number of wires selected from the sorted wires.

Step S403: defining a random wire combination when the influence areas of the wires corresponding to the random wire combination do not have an overlapping area as an optional wire combination, defining the optional wire combination with the largest number of wires as a used wire combination, and updating the random wire combination according to the remaining wires other than the used wire combination to continue determining the used wire combination until all the sorted wires are included in the used wire combination.

When there is no overlapping area in the influence area of the wires corresponding to the random wire combination, it means that the wires in the currently selected random wire combination can be taken by the sampling component at the same time. At this time, it is defined as an optional wire combination to distinguish different random wire combinations, which is convenient for subsequent analysis; at the same time, the wire combination is continuously determined to determine the wires taken by the sampling component in the same batch, which is convenient for subsequent control of the sampling component.

Step S404: determining the overall picking order according to the order of using the wire material combinations and the contact picking order, and controlling the picking assembly to clamp each wire material into the fixture according to the overall picking order.

The order of picking up each wire in the optional wire combination can be determined by determining the order in which the wire combinations are used. At this time, the wire that contacts the front of the wire combination corresponding to the picking order is placed at the back to determine the overall picking order. The material picking component is controlled to clamp each wire according to the overall picking order, so that the overall efficiency of the wire test is higher.

5 , after the overall picking order is determined, the wire strain measurement method further includes:

Step S500: defining the wire at the end of the overall picking sequence as the rear wire, and defining the wire loading position corresponding to the rear wire as the loading initial position.

The rear wire is defined to determine the last wire taken, and the wire loading position of the rear wire is defined as the initial loading position to distinguish it and facilitate subsequent analysis.

Step S501: Calculate and update the wire loading position of each wire according to the initial loading position, the overall picking sequence and the preset safety distance.

The safety distance is the distance value to be maintained between the wires on the fixture. The initial loading position is taken as the starting point. The specific clamping position of each wire on the fixture can be obtained according to the overall picking order, thereby realizing the update of the wire loading position.

Step S502: Control each material taking component to move to a corresponding wire loading position to clamp the wire in a clamp.

Control each material taking component to move to the updated wire loading position so that the wire can be moved to the fixture in an orderly manner. At the same time, the wire that is taken first needs to move a longer distance, and the wire that is taken last needs to move a shorter distance. It is less likely to have to wait for a wire to be in place, thereby improving the overall test effect.

6 , the method for determining the clamping force to be used within the available clamping force range includes:

Step S600: Generate a randomly variable virtual clamping force within an available clamping force range.

The virtual clamping force is a force that can be randomly changed within the available clamping force range.

Step S601: determining the central clamping force according to the permissible clamping force range of each wire, and performing a difference calculation based on the virtual clamping force and the central clamping force to determine the deviation clamping force.

The center clamping force is the clamping force value at the center within the allowable clamping force range, that is, the clamping force that theoretically makes the wire on the clamp have the best effect. The deviation clamping force is the difference between the virtual clamping force and the center clamping force, and the difference is an absolute value.

Step S602: Calculate all the deviation clamping forces to determine the deviation degree value, and determine the deviation degree value with the smallest value according to the sorting rule, and define the virtual clamping force corresponding to the deviation degree value as the used clamping force.

The deviation degree value can be obtained by adding up all the deviation clamping forces. The larger the value, the worse the effect of the currently determined virtual clamping force, and vice versa. The virtual clamping force corresponding to the smallest deviation degree value is defined as the clamping force through the sorting rules, so that the overall test effect is better.

Referring to FIG. 7 , based on the same inventive concept, an embodiment of the present invention provides a wire strain measurement system, comprising:

An acquisition module, used for acquiring a preset platform detection weight of a placement platform;

A processing module, connected to the acquisition module and the judgment module, for storing and processing information;

A judgment module, connected with the acquisition module and the processing module, for judging the information;

When the judging module judges that the platform detection weight is greater than the preset reference weight, the acquiring module acquires the platform real-time image, and enables the processing module to compare and analyze the platform real-time image and the preset original image to determine the test wire image, the overall length of the wire, the end position of the wire and the wire grabbing position;

The processing module calculates the wire test length according to the overall length of the wire and the preset blank length, and calculates the wire feeding position according to the wire test length, the wire grabbing position and the preset fixture installation position;

The processing module inputs the test wire image into a preset material database for matching analysis to determine the test wire density, and calculates the original cross-sectional area and original width of the wire according to the platform detection weight, the overall length of the wire and the test wire density;

The processing module determines the permissible clamping force range corresponding to the original width of the wire according to a preset range matching relationship;

The processing module controls the preset material picking component to move to the wire grabbing position to clamp the wire, and controls the material picking component to move to the wire loading position after clamping, and controls the material picking component to rotate in the process of moving to the wire loading position so that the wire is vertically downward, and controls the clamp to clamp the wire with a random clamping force within the allowable clamping force range after the material picking component moves to the wire loading position, and controls the clamp to move backward after clamping to obtain the wire detection status in real time;

When the judging module judges that the wire material detection state is consistent with the preset fracture state, the obtaining module obtains the final fracture length of the wire material at the moment of fracture, and enables the processing module to calculate the fracture cross-sectional area of the wire material according to the final fracture length;

The processing module calculates the elongation according to the final breaking length and the test length of the wire material, and calculates the cross-sectional shrinkage according to the original cross-sectional area of the wire material and the broken cross-sectional area of the wire material;

Multi-wire test module, used to analyze and process the situation when multiple wires are tested simultaneously;

A multi-set screening module is used to screen multiple common processing sets that meet the requirements;

A wire clamping control module is used to determine the clamping sequence of multiple wires and control the clamping process of the wires;

The feeding position update module is used to update the wire feeding position to make the overall test more stable;

The clamping force determination module is used to determine a more appropriate clamping force for use.

Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. The specific working process of the above-described system, device and unit can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

Claims (5)

1. A wire strain measurement method, comprising: Obtain the platform detection weight of the preset placement platform; When the platform detection weight is greater than the preset reference weight, a real-time image of the platform is obtained, and a comparison analysis is performed based on the real-time image of the platform and the preset original image to determine the test wire image, the overall length of the wire, the end position of the wire, and the wire grabbing position; The wire test length is determined by calculation based on the overall length of the wire and the preset blank length, and the wire feeding position is determined by calculation based on the wire test length, the wire grabbing position and the preset fixture installation position; Input the test wire image into the preset material database for matching analysis to determine the test wire density, and calculate the original cross-sectional area and original width of the wire according to the platform detection weight, the overall length of the wire and the test wire density; Determine the permissible clamping force range corresponding to the original width of the wire according to the preset range matching relationship; Control the preset material taking component to move to the wire grabbing position to clamp the wire, and control the material taking component to move to the wire loading position after clamping, and control the material taking component to rotate in the process of moving to the wire loading position so that the wire is vertically downward, and control the clamp to clamp the wire with a random clamping force within the allowable clamping force range after the material taking component moves to the wire loading position, and control the clamp to move backward after clamping to obtain the wire detection status in real time; When the wire detection state is consistent with the preset fracture state, the final fracture length of the wire at the moment of fracture is obtained, and the fracture cross-sectional area of the wire is calculated according to the final fracture length; The elongation is determined by calculation based on the final breaking length and the test length of the wire, and the reduction of area is determined by calculation based on the original cross-sectional area of the wire and the cross-sectional area of the wire at break; After the test wire image is determined, the wire strain measurement method further includes: Counting is performed based on the test wire image to determine the number of test wires; Determine whether the number of test wires is one; If the number of the test wires is one, the material taking component is controlled to clamp the wire to the fixture to control the fixture to move backward; If the number of test wires is not one, the permissible clamping force range of each wire is obtained, and wires with overlapping permissible clamping force ranges are classified into the same set to determine a common processing set; Counting the wires in the common processing set to determine the number of the set wires, and determining the number of the set wires with the largest value according to a preset sorting rule, and defining the number of the set wires as the number of detection wires, and defining the common processing set corresponding to the number of detection wires as the stress test set; The overlapped part of the allowable clamping force range corresponding to each wire in the stress test set is defined as the available clamping force range, and the clamping force to be used is determined within the available clamping force range, and the sampling assembly controlling the number of wires to be tested clamps each wire in the stress test set into the clamp respectively, and controls the clamp to clamp the wire using the clamping force; After the number of wires is determined, the wire strain measurement method further includes: Determine whether there are at least two common processing sets with the same and largest number of wire materials; If there are not at least two common processing sets with the same and largest number of wire materials, the only common processing set is determined as the stress test set; If there are at least two common processing sets with the same and largest number of wires, the corresponding common processing sets are defined as candidate processing sets, and the overall length of the wires with the smallest value is determined in the candidate processing sets according to the sorting rule, and the overall length of the wires is defined as the lower limit overall length; Performing a difference calculation based on the overall length of each wire in the candidate processing set and the lower limit overall length to determine the local deviation length, and performing a sum calculation based on all the local deviation lengths to determine the overall deviation length; The overall deviation length with the smallest value is determined according to the sorting rule, and the candidate processing set corresponding to the overall deviation length is defined as the stress test set. 2. The wire strain measurement method according to claim 1, characterized in that the step of controlling the sampling assembly for detecting the number of wires to clamp each wire in the stress test set into a fixture comprises: In the stress test set, a wire on the placement platform that intersects with any wire other than itself is defined as a contact wire, and a wire that is not a contact wire is defined as an independent wire; In the contact wires, the contact wires are analyzed according to the test wire images to determine the contact picking order of each contact wire, and the contact wire at the front of the contact picking order and the independent wire are defined as the sorting wires; Determine the influence area by the wire grabbing position of any sorted wire and the preset influence distance, and make any combination among the sorted wires to determine the random wire combination; The random wire combination when the influence areas of the wires corresponding to the random wire combination do not have overlapping areas is defined as an optional wire combination, and the optional wire combination with the largest number of wires is defined as a used wire combination, and the random wire combination is updated according to the wires other than the used wire combination to continue to determine the used wire combination until all the sorted wires are included in the used wire combination; The overall picking order is determined according to the order of using the wire material combinations and the contact picking order, and the material picking component is controlled to clamp each wire material into the clamp according to the overall picking order. 3. The wire strain measurement method according to claim 2, characterized in that after the overall taking order is determined, the wire strain measurement method further comprises: The wire at the end of the overall picking sequence is defined as the rear wire, and the wire loading position corresponding to the rear wire is defined as the initial loading position; Calculate and update the wire loading position of each wire according to the initial loading position, the overall picking order and the preset safety distance; Each material taking assembly is controlled to move to a corresponding wire material loading position to clamp the wire material in the clamp. 4. The wire strain measurement method according to claim 1, wherein the method for determining the clamping force to be used within the available clamping force range comprises: Generate a virtual clamping force that can be randomly changed within the available clamping force range; The central clamping force is determined according to the allowable clamping force range of each wire material, and the deviation clamping force is determined by performing a difference calculation based on the virtual clamping force and the central clamping force; Calculation is performed based on all the deviation clamping forces to determine the deviation degree value, and the deviation degree value with the smallest value is determined based on the sorting rule, and the virtual clamping force corresponding to the deviation degree value is defined as the used clamping force. 5. A wire strain measurement system, comprising: An acquisition module, used for acquiring a preset platform detection weight of a placement platform; A processing module, connected to the acquisition module and the judgment module, for storing and processing information; A judgment module, connected with the acquisition module and the processing module, for judging the information; When the judging module judges that the platform detection weight is greater than the preset reference weight, the acquiring module acquires the platform real-time image, and enables the processing module to compare and analyze the platform real-time image and the preset original image to determine the test wire image, the overall length of the wire, the end position of the wire and the wire grabbing position; The processing module calculates the wire test length according to the overall length of the wire and the preset blank length, and calculates the wire feeding position according to the wire test length, the wire grabbing position and the preset fixture installation position; The processing module inputs the test wire image into a preset material database for matching analysis to determine the test wire density, and calculates the original cross-sectional area and original width of the wire according to the platform detection weight, the overall length of the wire and the test wire density; The processing module determines the permissible clamping force range corresponding to the original width of the wire according to a preset range matching relationship; The processing module controls the preset material picking component to move to the wire grabbing position to clamp the wire, and controls the material picking component to move to the wire loading position after clamping, and controls the material picking component to rotate in the process of moving to the wire loading position so that the wire is vertically downward, and controls the clamp to clamp the wire with a random clamping force within the allowable clamping force range after the material picking component moves to the wire loading position, and controls the clamp to move backward after clamping to obtain the wire detection status in real time; When the judging module judges that the wire material detection state is consistent with the preset fracture state, the obtaining module obtains the final fracture length of the wire material at the moment of fracture, and enables the processing module to calculate the fracture cross-sectional area of the wire material according to the final fracture length; The processing module calculates the elongation according to the final breaking length and the test length of the wire material, and calculates the cross-sectional shrinkage according to the original cross-sectional area of the wire material and the broken cross-sectional area of the wire material; The post-processing module determines the number of test wires by counting the test wire images; The judging module judges whether the number of the test wires is one; If the judging module judges that the number of the test wires is one, the processing module controls the material taking component to clamp the wires to the fixture to control the fixture to move backward; If the judging module judges that the number of the test wires is not one, the obtaining module obtains the permissible clamping force range of each wire, and causes the processing module to classify the wires with overlapping permissible clamping force ranges into the same set to determine a common processing set; The processing module counts the wires in the common processing set to determine the number of the set wires, and determines the number of the set wires with the largest value according to a preset sorting rule, and defines the number of the set wires as the number of detection wires, and defines the common processing set corresponding to the number of detection wires as the stress test set; The processing module defines the overlapped part of the allowable clamping force range corresponding to each wire in the stress test set as the available clamping force range, determines the clamping force to be used within the available clamping force range, and controls the sampling component of the number of wires to be tested to clamp each wire in the stress test set into the clamp, and controls the clamp to clamp the wire using the clamping force; After the number of the assembled wires is determined, the determination module determines whether there are at least two common processing sets with the same and largest number of assembled wires; If the judging module judges that there are not at least two common processing sets with the same number of wire materials and the largest number, the processing module determines the only common processing set as the stress test set; If the judging module judges that there are at least two common processing sets with the same and largest number of wires, the processing module defines the corresponding common processing set as an alternative processing set, and determines the wire overall length with the smallest value in the alternative processing set according to the sorting rule, and defines the wire overall length as the lower limit overall length; The processing module performs a difference calculation based on the overall length of each wire in the candidate processing set and the lower limit overall length to determine the local deviation length, and performs a sum calculation based on all the local deviation lengths to determine the overall deviation length; The processing module determines the overall deviation length with the smallest value according to the sorting rule, and defines the candidate processing set corresponding to the overall deviation length as the stress test set.