CN114914035B - Method and device for determining blanking length of three twisted wires before twisting and computer equipment - Google Patents

Method and device for determining blanking length of three twisted wires before twisting and computer equipment Download PDF

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Publication number
CN114914035B
CN114914035B CN202210647738.1A CN202210647738A CN114914035B CN 114914035 B CN114914035 B CN 114914035B CN 202210647738 A CN202210647738 A CN 202210647738A CN 114914035 B CN114914035 B CN 114914035B
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length
twisted
wire
stranded
wires
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CN114914035A (en
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周录尧
李海林
郭红
胡瑞霞
李国辉
车明明
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FAW Jiefang Automotive Co Ltd
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FAW Jiefang Automotive Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/17—Function evaluation by approximation methods, e.g. inter- or extrapolation, smoothing, least mean square method
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/0036—Details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/02—Stranding-up
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/02—Stranding-up
    • H01B13/0207—Details; Auxiliary devices

Abstract

The application relates to a method, a device, a computer device, a storage medium and a computer program product for determining a blanking length before stranding of three stranded wires. The method includes determining wire diameters of three twisted wires to be subjected to twisting treatment, the three twisted wires having the same wire specification; acquiring a preset lay length, the finished product length of the twisted three strands and the terminal length of the twisted wire; determining ellipses formed by each stranded wire in the cross section of the three stranded wires in a preset state, wherein each two adjacent ellipses are in a tangent state; determining a target helix angle based on an axisymmetric line between two ellipses, an expression of one of the ellipses related to the axisymmetric line, a preset lay length and a wire diameter; and determining the post-stranding length and the pre-stranding length of the stranded wire according to the target helix angle, the post-stranding finished product length and the terminal length of the stranded wire, and determining the pre-stranding blanking length of the three stranded wires. By adopting the method, the blanking length of the three stranded wires before stranding can be quantified.

Description

Method and device for determining blanking length of three twisted wires before twisting and computer equipment
Technical Field
The present application relates to the field of wire processing technology, and in particular, to a method, an apparatus, a computer device, a storage medium, and a computer program product for determining a blanking length of a three-stranded wire before stranding.
Background
Along with the development of wire processing technology, especially in the field of three-stranded wire processing, in the processing process of mutually stranding three insulated metal wires according to a certain degree of density to prepare a three-stranded wire finished product, the blanking length before stranding needs to be considered, and the blanking is overlong and can cause material waste and too short to cause three-stranded wire finished product failure, so that accurate calculation of the blanking length before stranding of the three-stranded wire is an important guarantee for producing the three-stranded wire.
However, the existing three-strand wire processing method only gives a range of the strand length corresponding to the length of the finished product of the three-strand wire, and does not consider how to accurately calculate the pre-strand blanking length corresponding to the length of the finished product of the three-strand wire when the stranded wire is subjected to blanking treatment before stranding treatment, so that the problem that the pre-strand blanking length of the three-strand wire cannot be quantized exists.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a method, apparatus, computer device, computer readable storage medium, and computer program product for determining a pre-twisted blanking length of a three-twisted wire capable of quantifying the pre-twisted blanking length of the three-twisted wire.
In a first aspect, the present application provides a method for determining a blanking length of a three-stranded wire before stranding. The method comprises the following steps:
determining the wire diameters of three stranded wires to be subjected to stranding treatment, wherein the three stranded wires have the same wire specification;
acquiring a preset lay length, the finished product length of the twisted three strands and the terminal length of the twisted wire;
determining ellipses formed by each stranded wire in the cross section of the three stranded wires in a preset state, wherein each two adjacent ellipses are in a tangent state;
determining a target helix angle based on an axisymmetric line between two ellipses, an expression of one of the ellipses related to the axisymmetric line, a preset lay length and a wire diameter;
the twisted finished product length is differed from the terminal length of the twisted wire, the twisted length of the twisted wire is obtained, and the pre-twisted length of the twisted wire is determined according to the target helix angle and the twisted length;
based on the pre-twisted length and the terminal length of the twisted wire, a pre-twisted blanking length of the three twisted wires is determined.
In one embodiment, wherein one of the ellipses associated with the axis of symmetry is a first ellipse, determining the target helix angle based on the axis of symmetry between two of the ellipses, the expression of one of the ellipses associated with the axis of symmetry, the preset lay length, and the wire diameter, comprises: determining the distance between a cylindrical spiral line corresponding to any section of the stranded wire and a cylindrical axis, and constructing a first function according to the relation among the distance, the lay length and the spiral angle; carrying out simultaneous solving on the expression based on the axisymmetric line and the expression of the first ellipse to obtain a second function, wherein the second function represents the relationship among the distance, the wire diameter and the helix angle; and calculating the target spiral angle according to the first function and the second function.
In one embodiment, the pre-twisting length is a length of a straight line formed after the cylindrical spiral line corresponding to the twisted wire is unfolded, the post-twisting length is an axial length of the cylindrical spiral line corresponding to the twisted wire, and the pre-twisting length of the twisted wire is determined according to the target spiral angle and the post-twisting length, including: and determining the cosine value of the target helix angle, and taking the ratio of the twisted length to the cosine value of the target helix angle as the twisted length of the twisted wire.
In one embodiment, determining the pre-twisted blanking length of the three strands based on the pre-twisted length and the terminal length of the twisted wire includes: and calculating the sum of the pre-twisting length and the terminal length of the twisted wire, and taking the difference between the sum of the pre-twisting length and the terminal length of the twisted wire and a preset blanking error as the pre-twisting blanking length of the three twisted wires.
In one embodiment, the method further comprises: determining a ratio between a preset lay length and the wire diameter according to the first function and the second function; acquiring a preset first lay error threshold value, and calculating to obtain an electric wire diameter error threshold value according to the ratio of the preset lay to the electric wire diameter and the first lay error threshold value; and triggering the three stranded wires with the blanking lengths before stranding to carry out stranding treatment under the condition that the error specification of the stranded wires is within the range of the wire diameter error threshold value, so as to obtain three stranded wires.
In one embodiment, the method further comprises: acquiring a preset second lay error threshold; constructing a third function of a second lay length error variable based on the product of a blanking error variable and a preset lay length and the ratio of the product to the pre-lay length, wherein the pre-lay length is the length of a straight line formed after a cylindrical spiral line corresponding to a stranded wire is unfolded; under the condition that the second lay error variable is the second lay error threshold value, solving the value of the blanking error variable according to a third function to obtain the blanking error threshold value; and triggering to twist three twisted wires with the blanking length before twisting under the condition that the blanking error is smaller than the blanking error threshold value, so as to obtain three twisted wires.
In a second aspect, the application also provides a device for determining the blanking length of the three-stranded wire before stranding. The device comprises:
the acquisition module is used for determining the wire diameters of three stranded wires to be subjected to stranding treatment, and the three stranded wires have the same wire specification;
the acquisition module is also used for acquiring preset lay length, the twisted finished product length of the three twisted wires and the terminal length of the twisted wires;
the determining module is used for determining ellipses formed by each stranded wire in the cross section of the three stranded wires in a preset state, wherein each two adjacent ellipses are in a tangent state;
The determining module is further used for determining a target helix angle based on an axisymmetric line between two ellipses, an expression of one ellipse related to the axisymmetric line, a preset lay length and a wire diameter;
the determining module is further used for differentiating the twisted finished product length from the terminal length of the twisted electric wire to obtain the twisted length of the twisted electric wire, and determining the pre-twisted length of the twisted electric wire according to the target helix angle and the twisted length;
the determining module is also used for determining the pre-twisting blanking length of the three twisted wires based on the pre-twisting length and the terminal length of the twisted wires.
In a third aspect, the present application also provides a computer device. The computer device comprises a memory storing a computer program and a processor which when executing the computer program performs the steps of:
determining the wire diameters of three stranded wires to be subjected to stranding treatment, wherein the three stranded wires have the same wire specification;
acquiring a preset lay length, the finished product length of the twisted three strands and the terminal length of the twisted wire;
determining ellipses formed by each stranded wire in the cross section of the three stranded wires in a preset state, wherein each two adjacent ellipses are in a tangent state;
Determining a target helix angle based on an axisymmetric line between two ellipses, an expression of one of the ellipses related to the axisymmetric line, a preset lay length and a wire diameter;
the twisted finished product length is differed from the terminal length of the twisted wire, the twisted length of the twisted wire is obtained, and the pre-twisted length of the twisted wire is determined according to the target helix angle and the twisted length;
based on the pre-twisted length and the terminal length of the twisted wire, a pre-twisted blanking length of the three twisted wires is determined.
In a fourth aspect, the present application also provides a computer-readable storage medium. The computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of:
determining the wire diameters of three stranded wires to be subjected to stranding treatment, wherein the three stranded wires have the same wire specification;
acquiring a preset lay length, the finished product length of the twisted three strands and the terminal length of the twisted wire;
determining ellipses formed by each stranded wire in the cross section of the three stranded wires in a preset state, wherein each two adjacent ellipses are in a tangent state;
determining a target helix angle based on an axisymmetric line between two ellipses, an expression of one of the ellipses related to the axisymmetric line, a preset lay length and a wire diameter;
The twisted finished product length is differed from the terminal length of the twisted wire, the twisted length of the twisted wire is obtained, and the pre-twisted length of the twisted wire is determined according to the target helix angle and the twisted length;
based on the pre-twisted length and the terminal length of the twisted wire, a pre-twisted blanking length of the three twisted wires is determined.
In a fifth aspect, the present application also provides a computer program product. The computer program product comprises a computer program which, when executed by a processor, implements the steps of:
determining the wire diameters of three stranded wires to be subjected to stranding treatment, wherein the three stranded wires have the same wire specification;
acquiring a preset lay length, the finished product length of the twisted three strands and the terminal length of the twisted wire;
determining ellipses formed by each stranded wire in the cross section of the three stranded wires in a preset state, wherein each two adjacent ellipses are in a tangent state;
determining a target helix angle based on an axisymmetric line between two ellipses, an expression of one of the ellipses related to the axisymmetric line, a preset lay length and a wire diameter;
the twisted finished product length is differed from the terminal length of the twisted wire, the twisted length of the twisted wire is obtained, and the pre-twisted length of the twisted wire is determined according to the target helix angle and the twisted length;
Based on the pre-twisted length and the terminal length of the twisted wire, a pre-twisted blanking length of the three twisted wires is determined.
The above-described method, apparatus, computer device, storage medium, and computer program product for determining a pre-lay length of a three-stranded wire by determining wire diameters of three stranded wires to be subjected to a stranding process, the three stranded wires having the same wire gauge; acquiring a preset lay length, the finished product length of the twisted three strands and the terminal length of the twisted wire; determining ellipses formed by each stranded wire in the cross section of the three stranded wires in a preset state, wherein each two adjacent ellipses are in a tangent state; determining a target helix angle corresponding to the three stranded wires in a preset state based on an axisymmetric line between two ellipses, an expression of one ellipse related to the axisymmetric line, a preset lay length and a wire diameter; then, based on the target spiral angle, the twisted finished product length of the three stranded wires and the terminal length of the stranded wires, the pre-twisted blanking length of the three stranded wires is determined, and the purpose of quantifying the pre-twisted blanking length of the three stranded wires based on the wire diameter, the twisting distance, the twisted finished product length of the three stranded wires and the terminal length of the stranded wires which are preset before twisting the three stranded wires to obtain the three stranded wires finished product can be achieved, so that the accurate control of the pre-twisted blanking length of the processing equipment in the processing process of the three stranded wires is realized.
Drawings
FIG. 1 is an environmental diagram of an application of a method for determining a blanking length of a three-strand wire before twisting in one embodiment;
FIG. 2 is a flow chart of a method for determining a blanking length of a three-strand wire before twisting in one embodiment;
FIG. 3A is a schematic diagram of right-hand twisting of twisted wires and three strands in one embodiment;
FIG. 3B is a schematic diagram of a left hand twist of twisted wires and three strands in one embodiment;
FIG. 4 is a schematic illustration of the lay length of a three-strand wire in one embodiment;
FIG. 5 is a schematic illustration of the finished twisted length of a three-strand wire in one embodiment;
FIG. 6 is a flow chart illustrating the step of determining a target pitch angle in one embodiment;
FIG. 7 is an expanded schematic view of a cylindrical spiral in one embodiment;
FIG. 8 is a schematic representation of a cross-section of a three-wire strand in one embodiment;
FIG. 9 is a block diagram of a device for determining a blanking length before twisting of three twisted wires in one embodiment;
fig. 10 is an internal structural view of a computer device in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
The method for determining the blanking length before twisting of the three-stranded wire, provided by the embodiment of the application, can be applied to an application environment shown in fig. 1. Wherein the terminal 102 communicates with the server 104 via a network. The data storage system may store data that the server 104 needs to process. The data storage system may be integrated on the server 104 or may be located on a cloud or other network server. The terminal 102 may independently perform the method for determining the pre-twisted blanking length of the three-stranded wire according to the embodiment of the present application, and the terminal 102 and the server 104 may cooperatively perform the method for determining the pre-twisted blanking length of the three-stranded wire according to the embodiment of the present application.
When the terminal 102 performs the pre-twisting blanking length determination method of the three twisted wires alone, the terminal 102 determines the wire diameters of the three twisted wires to be twisted, the three twisted wires having the same wire specification; acquiring a preset lay length, the finished product length of the twisted three strands and the terminal length of the twisted wire; determining ellipses formed by each stranded wire in the cross section of the three stranded wires in a preset state, wherein each two adjacent ellipses are in a tangent state; determining a target helix angle based on an axisymmetric line between two ellipses, an expression of one of the ellipses related to the axisymmetric line, a preset lay length and a wire diameter; the twisted finished product length is differed from the terminal length of the twisted wire, the twisted length of the twisted wire is obtained, and the pre-twisted length of the twisted wire is determined according to the target helix angle and the twisted length; based on the pre-twisted length and the terminal length of the twisted wire, a pre-twisted blanking length of the three twisted wires is determined.
When the terminal 102 and the server 104 cooperatively perform the pre-twisting blanking length determination method of the three twisted wires, the terminal 102 determines wire diameters of three twisted wires to be twisted, the three twisted wires having the same wire specification; the preset lay length, the twisted finished length of the three strands, and the terminal length of the twisted wire are obtained, and the wire diameter, the preset lay length, the twisted finished length of the three strands, and the terminal length of the twisted wire are transmitted to the server 104. The server 104 determines ellipses formed by each stranded wire in the cross section of the three stranded wires in a preset state, wherein each two adjacent ellipses are in a tangent state; determining a target helix angle based on an axisymmetric line between two ellipses, an expression of one of the ellipses related to the axisymmetric line, a preset lay length and a wire diameter; the twisted finished product length is differed from the terminal length of the twisted wire, the twisted length of the twisted wire is obtained, and the pre-twisted length of the twisted wire is determined according to the target helix angle and the twisted length; based on the pre-twisted length and the terminal length of the twisted wire, a pre-twisted blanking length of the three twisted wires is determined.
The terminal 102 may be, but not limited to, various personal computers, notebook computers, smart phones, tablet computers, internet of things devices, and portable wearable devices, where the internet of things devices may be smart speakers, smart televisions, smart air conditioners, smart vehicle devices, and the like. The portable wearable device may be a smart watch, smart bracelet, headset, or the like. The server 104 may be implemented as a stand-alone server or as a server cluster of multiple servers.
It should be appreciated that the terms "first," "second," "third," and the like, as used in embodiments of the present application, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The singular forms "a," "an," or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one, unless the context clearly dictates otherwise.
It should be noted that, the three stranded wires are the most commonly used transmission medium in comprehensive wiring engineering, and are generally formed by intertwining three mutually insulated metal wires, and have the characteristics of electromagnetic compatibility and the like. In practical use, one or more pairs of three-stranded wires are placed in an insulating sleeve to form a three-stranded wire cable, and the three-stranded wire cable is generally directly called a three-stranded wire. Applications for the three strands include, but are not limited to, CAN wires, and may also include control wires for engine injector nozzles, control wires for actuators, wiring harnesses for sensors, and the like.
In one embodiment, as shown in fig. 2, a method for determining a blanking length before twisting of three twisted wires is provided, and the method can be performed by a terminal or a server alone or in cooperation with the terminal and the server. The embodiment of the application is illustrated by taking the terminal in fig. 1 as an example, and includes the following steps:
In step 202, the wire diameters of three twisted wires to be subjected to the twisting process are determined, the three twisted wires having the same wire gauge.
Among them, the twisted wire is an insulated metal wire, such as an insulated copper wire, for performing a twisting process to constitute a triple twisted wire. By winding three twisted wires placed in parallel to each other so as to intersect with each other, a three-stranded wire as shown in fig. 3A and 3B can be obtained. The three-stranded wire has a three-stranded wire spiral structure, and the three-stranded wire spiral is of a space structure formed by sweeping three cylindrical spiral wires with adjacent axisymmetric phases which are sequentially different by 120 degrees. The cylindrical spiral line is a track formed by constant-speed rotation of a moving point around the axis of a cylindrical surface and constant-speed movement along the axis direction.
Referring to fig. 3A and 3B, the twisting direction includes a left twisting direction or a right twisting direction. As shown in fig. 3A, when the visible portion of the cylindrical spiral is twisted with the letter Z that defines two cross-sections thereof, it is referred to as right-hand twist; as shown in fig. 3B, when the visible portion of the cylindrical spiral forms a letter S with the two cross sections bounding it, it is referred to as left-hand twist. The twisted wires and the three twisted wires have twisting directions, and the twisting directions of the three twisted wires are uniform with the twisting directions of the three twisted wires. When the twisting directions of the three twisted wires are different from those of the three twisted wires, for example, the twisting directions of the three twisted wires are all left-hand twisting, and the twisting directions of the three twisted wires are right-hand twisting, the internal structure of the twisted wires may be damaged in this case, so that the quality of the twisted three-wire finished product can be ensured by keeping the twisting directions of the three twisted wires consistent with those of the three twisted wires.
The wire gauge of the stranded wire is specified in accordance with industry standards, and industry standards also specify a defined correspondence between wire gauge and wire diameter, for example, when the wire gauge of the stranded wire is 2 x 0.35mm 2 The wire diameter a of the twisted wire is about 1.3mm when the wire gauge of the twisted wire is 2 x 0.5mm 2 When the wire diameter a of the twisted wire is about 1.5mm。
Specifically, for three twisted wires to be subjected to the twisting process, the terminal determines the wire diameters a of the three twisted wires to be subjected to the twisting process, which have the same wire specifications, twisting directions and lengths, in accordance with the correspondence between the wire specifications and the wire diameters, based on the wire specifications of the twisted wires.
Step 204, obtaining preset pitches, twisted finished product lengths of the three twisted wires and terminal lengths of the twisted wires.
The lay length is the axial distance of at least one complete turn of helix formed by the three strands, i.e. the lay length is at least three times the distance between three adjacent knuckles. The twisted joints are twisted joints of three twisted wires forming the three twisted wires, and the greater the twisting distance is, the more sparse the twisted joints of the three twisted wires are spaced, and the more closely the twisted joints are otherwise. As shown in fig. 4, H represents the lay length of the three strands, the strands of the three strands being equidistantly spaced, the lay length H being three times the distance between two adjacent strands.
The preset lay length H' is a lay length of three twisted wires formed by twisting three twisted wires to be subjected to twisting treatment.
As shown in fig. 5, the twisted finished product length F of the three twisted wires is the length of any one twisted wire after the twisting process, that is, the length of the three twisted wire finished product formed by twisting three twisted wires. The terminal length of the stranded wire is a length of a portion of the stranded wire that is not stranded at both ends thereof, including a left end untwisted length of the stranded wire and a right end untwisted length of the stranded wire. When three stranded wires are stranded to obtain a three-stranded wire finished product, two ends of the three stranded wires, namely a left end and a right end, are used as fixed ends, the three stranded wires are stranded at a part between the left end and the right end of the three stranded wires without being stranded to obtain three stranded wires, and the strand length of the three stranded wires, the length of the stranded finished product of the three stranded wires and the terminal length of the stranded wires are preset.
Specifically, the terminal acquires a preset lay length H', a twisted finished length F of the three strands, and a terminal length (m+n) of the twisted electric wire.
And 206, determining ellipses formed by each stranded wire in the cross section of the three strands in a preset state, wherein each two adjacent ellipses are in a tangent state.
Wherein, the preset state is that the stranded state of the three stranded wires meets the following conditions: of three ellipses formed by three stranded wires in the cross section of the three stranded wires, every two ellipses are tangent. It can be understood that the preset state of the three-stranded wire is a compliant state, so that the quality of the finished product of the three-stranded wire can be ensured, and the problems of short service life and the like of the three-stranded wire caused by too loose or too tight hinge joints are avoided.
Specifically, the terminal determines three ellipses formed by three stranded wires in a cross section of the three stranded wires in a preset state, wherein each two adjacent ellipses are in a tangent state.
Step 208, determining a target helix angle based on the axisymmetric line between the two ellipses, the expression of one of the ellipses related to the axisymmetric line, the preset lay length and the wire diameter.
The axial symmetry line is an axial symmetry line between any two ellipses in the cross section of the three ellipses in the preset state, and the two ellipses are tangential to the axial symmetry line. The target helix angle beta' is the helix angle corresponding to the three strands in a preset state, and the helix angle is an acute angle between the cylindrical helix and the axis of the cylindrical surface passing through the tangent point on the cylindrical surface.
Specifically, the terminal determines a target helix angle β 'corresponding to when the three strands are in a preset state based on an axisymmetric line between two ellipses thereof, an expression of one of the ellipses related to the axisymmetric line, a preset lay length H', and a wire diameter a.
Step 210, the twisted finished length is differenced from the terminal length of the twisted wire to obtain the twisted length of the twisted wire, and the pre-twisted length of the twisted wire is determined according to the target helix angle and the twisted length.
The twisted length Z of the twisted wire is the length of a part of any twisted wire, which is positioned between the left end and the right end of the twisted wire, after twisting treatment. The twisted length Z of the twisted wire is the difference between the twisted finished length F of the three twisted wires and the terminal length (m+n) of the twisted wire. The pre-twisting length S of the twisted electric wire is the length of a portion of any of the twisted electric wires located between the left and right ends of the twisted electric wire before the twisting process. The ratio of the post-twisted length Z to the pre-twisted length S of the twisted wire is proportional to the helix angle, and when the helix angle is the target helix angle beta', the ratio of the post-twisted length Z to the pre-twisted length S of the twisted wire is a fixed value.
Specifically, the terminal makes a difference between the twisted finished length F and the terminal length (M+N) of the twisted wire to obtain a twisted length Z of the twisted wire; and determining the pre-twisting length S of the twisted wire according to the target helix angle beta' and the post-twisting length Z and the proportional relation between the ratio of the post-twisting length Z to the pre-twisting length S of the twisted wire and the helix angle.
Step 212, determining a pre-twisted blanking length of the three twisted wires based on the pre-twisted length and the terminal length of the twisted wire.
Wherein, when the blanking error is not considered, the pre-twisted length S of the stranded wire is a difference between the pre-twisted blanking length E of the three strands and the terminal length (m+n) of the stranded wire.
Specifically, the terminal calculates the sum of the pre-twisted length S and the terminal length (m+n) of the twisted wire, and determines the pre-twisted blanking length E of the three twisted wires from the sum of the pre-twisted length S and the terminal length (m+n) of the twisted wire.
In the method for determining the blanking length before twisting of the three twisted wires, the wire diameters of the three twisted wires to be twisted are determined, and the three twisted wires have the same wire specification; acquiring a preset lay length, the finished product length of the twisted three strands and the terminal length of the twisted wire; determining ellipses formed by each stranded wire in the cross section of the three stranded wires in a preset state, wherein each two adjacent ellipses are in a tangent state; determining a target helix angle corresponding to the three stranded wires in a preset state based on an axisymmetric line between two ellipses, an expression of one ellipse related to the axisymmetric line, a preset lay length and a wire diameter; then, based on the target spiral angle, the twisted finished product length of the three stranded wires and the terminal length of the stranded wires, the pre-twisted blanking length of the three stranded wires is determined, and the purpose of quantifying the pre-twisted blanking length of the three stranded wires based on the wire diameter, the twisting distance, the twisted finished product length of the three stranded wires and the terminal length of the stranded wires which are preset before twisting the three stranded wires to obtain the three stranded wires finished product can be achieved, so that the accurate control of the pre-twisted blanking length of the processing equipment in the processing process of the three stranded wires is realized.
In one embodiment, as shown in fig. 6, where one of the ellipses associated with the axis of symmetry is a first ellipse, determining the target helix angle based on the axis of symmetry between two of the ellipses, the expression of one of the ellipses associated with the axis of symmetry, the preset lay length, and the wire diameter, includes:
step 602, determining a distance between a cylindrical spiral line and a cylindrical axis corresponding to any section of the stranded wire, and constructing a first function according to a relation among the distance, the lay length and the spiral angle.
Specifically, as shown in fig. 7, after determining ellipses formed by each stranded wire in a cross section of the three stranded wires in a preset state, the terminal determines a cylindrical spiral line corresponding to any section of any stranded wire in a tangential state between every two adjacent ellipses, takes an axial distance of at least one whole circle of spiral line in the cylindrical spiral line as a lay length H of the three stranded wires, and takes an included angle (angle ABC) between a straight line formed by expanding the cylindrical spiral line and a cylindrical axis as a spiral angle beta. The terminal determines the circumferential length 2pi.L of a circle having a radius of the distance L of the cylindrical helix from the cylindrical axis and sets the tangent of the helix angle beta as the quotient between the circumferential length and the lay H to construct a first function representing the relationship between the helix angle beta, the lay H and the distance L of the cylindrical helix from the cylindrical axis, which can be expressed by the following formula:
At step 604, a second function is obtained based on the co-solving of the expression of the axisymmetric line and the expression of the first ellipse, the second function characterizing the relationship among distance, wire diameter, and helix angle.
The first ellipse is one of ellipses related to an axial symmetry line, the axial symmetry line is tangential to the first ellipse, and the axial symmetry line is also tangential to the second ellipse. The expression of the axis symmetry line is an equation of the axis symmetry line, and the expression of the first ellipse is a standard equation of the first ellipse. As shown in fig. 8, in the rectangular coordinate system, the first ellipse is an ellipse located in the second quadrant, and the second ellipse is an ellipse with the major axis on the x-axis. At this time, the axisymmetry line between the first ellipse and the second ellipse is a straight lineThe first ellipse and the second ellipse are tangential to a straight line +.>I.e. the expression of the axis symmetry line is +.>
The length of the long axis of the first ellipse is the ratio of the wire diameter a to the cosine value cos beta of the helix angle, the length of the short axis is the wire diameter a, and the standard equation of the first ellipse is:
specifically, the expression of the terminal based on the axis symmetry lineAnd (4) the expression of the first ellipse, simultaneously solving to obtain a second function, wherein the second function characterizes the relationship among the distance, the wire diameter and the helix angle, and the second function is expressed by the following formula:
In one embodiment, based onExpression of axisymmetry lineSimultaneously solving with the expression (4) of the first ellipse to obtain a second function represented by formula (3), comprising: the terminal will->Substituting the formula (4) to obtain a binary primary equation about x, solving a discriminant of a root of the binary primary equation about x, taking the discriminant of the root as zero, and calculating to obtain a second function represented by the formula (6).
Step 606, calculating a target spiral angle according to the first function and the second function.
Specifically, the terminal substitutes the wire diameter a and the preset lay length H 'into the first function expressed by the formula (1) and the second function expressed by the formula (6), and by combining the first function and the second function, the target helix angle β' can be calculated.
Specifically, the terminal substitutes the wire diameter a and the preset twisting distance H 'into the first function and the second function, sets the value of the second function to be zero, and can calculate the corresponding target helix angle beta' when the three strands are in the preset twisting state by combining the first function and the second function.
In this embodiment, after determining ellipses formed by each stranded wire in a cross section of the three stranded wires in a preset state, wherein each two adjacent ellipses are in a tangent state, determining a distance between a cylindrical spiral line corresponding to any section of the stranded wires and a cylindrical axis, constructing a first function according to a relation among the distance, the pitch and the spiral angle, performing simultaneous solving based on an expression of an axisymmetric line and an expression of the first ellipse to construct a second function, substituting a wire diameter and a preset pitch into the first function and the second function to perform joint solving, so that the purpose of determining a target spiral angle based on an axisymmetric line between any two ellipses, an expression of one ellipse related to the axisymmetric line, the preset pitch and the wire diameter can be achieved.
In the conventional processing method, the twisted wires having different wire specifications are usually fixed at the same lay length, for example, the wire specification is 3×0.5mm 2 、3x0.75mm 2 、3x1.5mm 2 The three strands of (a) are all set to 35mm in strand length, which can lead to inconsistent degree of the density of the strands, and the wire specification is 3x0.5mm 2 Is too loose for a wire gauge of 3x1.5mm 2 The three-stranded wires of the three-stranded wire are too tight, and can possibly cause distortion damage to insulation, and are not in an ideal state, so that the traditional processing method also has the problem that the density degree of the three-stranded wire stranded by stranded wires with different wire specifications is not consistent. In this embodiment, the target spiral angle corresponding to the three stranded wires in the preset state can be determined based on the wire diameter and the preset lay length, so that when the target spiral angle is a fixed value, the lay lengths corresponding to the wire specifications can be calculated for the stranded wires with different wire specifications, and the effect that the joint density degree of the three stranded wires formed by stranding the stranded wires with different wire specifications is consistent is achieved.
In one embodiment, the pre-twisted length is a length of a straight line formed by expanding a cylindrical spiral line corresponding to a twisted wire, the post-twisted length is an axial length of the cylindrical spiral line corresponding to the twisted wire, and the pre-twisted length of the twisted wire is determined according to the target spiral angle and the post-twisted length, including: and determining the cosine value of the target helix angle, and taking the ratio of the twisted length to the cosine value of the target helix angle as the twisted length of the twisted wire.
In the right triangle ABC shown in fig. 7, the length S before twisting is the length of a straight line formed by expanding a cylindrical spiral line corresponding to any twisted wire, the length Z after twisting is the axial length of the cylindrical spiral line corresponding to any twisted wire, and the cosine value cos β 'of the target helix angle β' is the ratio of the length Z after twisting to the length S before twisting.
Specifically, the terminal determines the cosine value cos β 'of the target helix angle, calculates the ratio of the twisted length Z to the cosine value cos β' of the target helix angle, and uses the ratio of the twisted length Z to the cosine value cos β 'of the target helix angle as the pre-twisted length S of the twisted wire, i.e., s=z/cos β'.
In this embodiment, by fixing the target spiral angle, the objective of calculating the pre-twisted length of the stranded wire based on the target spiral angle and the post-twisted length of the stranded wire can be achieved by taking the ratio of the post-twisted length to the pre-twisted length as the cosine value of the target spiral angle.
In one embodiment, determining the pre-twisted blanking length of the three strands based on the pre-twisted length, the terminal length of the twisted wire, includes: and calculating the sum of the pre-twisting length and the terminal length of the twisted wire, and taking the difference between the sum of the pre-twisting length and the terminal length of the twisted wire and a preset blanking error as the pre-twisting blanking length of the three twisted wires.
Wherein the blanking error is an error related to the processing equipment, and different processing equipment has different blanking errors. After determining the preset blanking error delta E ', the terminal selects processing equipment with the blanking error meeting preset conditions according to the preset blanking error delta E'. The preset condition may be that a difference between the blanking error of the processing apparatus and the preset blanking error Δe' is smaller than a blanking error threshold, which is not limited in this embodiment. The blanking length E before twisting of the three twisted wires is the length of any twisted wire before twisting treatment.
Specifically, the terminal calculates the pre-stranding blanking length E of the three strands according to the following formula:
E＝S+M+N–ΔE’，
in the above formula, S is the pre-twisting length of the twisted wire, (m+n) is the terminal length of the twisted wire, and Δe' is a preset blanking error.
In this embodiment, the difference between the sum of the pre-twisted length and the terminal length of the twisted wire and the preset blanking error is used as the pre-twisted blanking length of the three twisted wires, so that the purpose of determining the pre-twisted blanking length of the three twisted wires based on the pre-twisted length of the twisted wire, the terminal length of the twisted wire and the preset blanking error can be achieved.
In one embodiment, the method for determining the blanking length before twisting of the three-stranded wire further comprises determining a ratio between a preset twisting distance and the diameter of the electric wire according to a first function and a second function; acquiring a preset first lay error threshold value, and calculating to obtain an electric wire diameter error threshold value according to the ratio of the preset lay to the electric wire diameter and the first lay error threshold value; and triggering the three stranded wires with the blanking lengths before stranding to carry out stranding treatment under the condition that the error specification of the stranded wires is within the range of the wire diameter error threshold value, so as to obtain three stranded wires.
The first pitch error threshold is a threshold of a first pitch error variable delta H, and can be preset according to the production requirement of the three-stranded wire finished product. The first lay error variable is a lay error due to a change in wire diameter. The wire diameter error threshold value is a threshold value of a wire diameter error variable Δa of theoretically stranded wires, and the wire diameter error threshold value range is a threshold value range corresponding to the wire diameter error threshold value, for example, when the wire diameter error threshold value is a threshold upper limit, the wire diameter error threshold value range may be smaller than the wire diameter error threshold value. The error specification of the stranded wire is an actual error specification of the stranded wire to be subjected to the stranding process.
Specifically, the terminal obtains the following formula according to the first function and the second function with zero value:
substituting the wire diameter a and the preset lay length H 'into the formula (9) to obtain the ratio of the preset lay length H' to the wire diameter a as follows
The terminal obtains a preset first lay error threshold value, substitutes the ratio between the first lay error threshold value, a preset lay H' and the wire diameter a into the following formula (10), and calculates to obtain the wire diameter error threshold value:
in the formula (10), Δh is a first lay error variable, Δa is a wire diameter error variable, H is a lay, and a is a wire diameter. The terminal obtains the error specification of the stranded wire, judges whether the error specification of the stranded wire is in a threshold range corresponding to the wire diameter error threshold, and triggers the processing equipment to carry out stranding treatment on three stranded wires with the blanking length E before stranding determined by the embodiment of the method under the condition that the error specification of the stranded wire is in the threshold range corresponding to the wire diameter error threshold, so as to obtain three stranded wires.
In this embodiment, by obtaining a preset first lay error threshold, according to a ratio between a preset lay and a wire diameter and the first lay error threshold, the purpose of determining the wire diameter error threshold can be achieved, so that when an error specification of a stranded wire is within a wire diameter error threshold range, three stranded wires with the blanking length before stranding determined by the method embodiment can be triggered to be stranded to obtain three stranded wires, accurate control of the lay error caused by the wire diameter error in a three-stranded wire processing process by processing equipment is achieved, and quality of a three-stranded wire finished product is improved.
In one embodiment, the method for determining the blanking length before twisting of the three twisted wires further includes obtaining a preset second twisting distance error threshold value; constructing a third function of a second lay length error variable based on the product of a blanking error variable and a preset lay length and the ratio of the product to the pre-lay length, wherein the pre-lay length is the length of a straight line formed after a cylindrical spiral line corresponding to a stranded wire is unfolded; under the condition that the second lay error variable is the second lay error threshold value, solving the value of the blanking error variable according to a third function to obtain the blanking error threshold value; and triggering to twist three twisted wires with the blanking length before twisting under the condition that the blanking error is smaller than the blanking error threshold value, so as to obtain three twisted wires.
Wherein the second lay error variable DeltaH E Is the lay length error caused by the change of the blanking length before twisting. The second lay error threshold is a second lay error variable ΔH E Can be based on the threshold value of the three-strand productThe production requirements are preset. The blanking error threshold is a threshold of the theoretical blanking error variable Δe. The third function is used to represent the second lay error variable DeltaH E The relationship between the blanking error variable deltae, the lay length H and the pre-lay length can be expressed by the following formula:
in formula (13), ΔH E Delta E is a blanking error variable, H is a lay length, and (E-N-M) is a pre-lay length. The length before twisting is the length of a straight line formed after the cylindrical spiral line corresponding to the twisted wire is unfolded.
Specifically, the terminal acquires a preset second lay error threshold, substitutes the second lay error threshold, the length before twisting (E-N-M) and the preset lay H' into the above formula (13), and calculates to obtain a blanking error threshold. And the terminal judges whether the preset blanking error delta E 'is smaller than a blanking error threshold value, and under the condition that the preset blanking error delta E' is smaller than the blanking error threshold value, the processing equipment is triggered to twist three stranded wires with the blanking length E before twisting determined by the embodiment of the method, so that three stranded wires are obtained.
In this embodiment, by obtaining the preset second lay error threshold, according to the second lay error threshold, the pre-lay length and the preset lay, the purpose of determining the blanking error threshold can be achieved, so that the stranded wire with the pre-lay blanking length determined by the method embodiment can be triggered to be stranded to obtain three strands under the condition that the preset blanking error is smaller than the blanking error threshold, accurate control of the lay error caused by the blanking error in the processing process of the three strands by processing equipment is achieved, and quality of a three-strand finished product is improved.
In one embodiment, a method for determining a blanking length of a three-stranded wire before stranding is provided, including the following steps:
1. defining the geometric parameters of the three stranded wires.
Cylindrical spiral line: a moving point rotates at a constant speed around the axis of a cylindrical surface and moves at a constant speed along the axis direction, and the locus of the moving point is called a cylindrical spiral line.
Three-twisted spiral line: the circular section is swept along three cylindrical spiral lines which are sequentially different by 120 degrees in phase and are adjacent to form a space structure in an axisymmetric mode.
The automobile three-stranded wire is of a three-stranded cylindrical spiral line structure. The twisting direction of the three twisted wires is the same as the twisting direction of the twisted wires. For conductors of an electrical wire, the direction of rotation of the stranded wire relative to the wire axis is referred to as the lay direction. Referring to fig. 3A and 3B, when the visible portion of the spiral forms a letter Z with the two cross-sections bounding it, it is referred to as right-hand twist, and when they form a letter S, it is referred to as left-hand twist. Likewise, there are also twist directions for the three strands, right-hand twist Z and left-hand twist S.
As shown in fig. 4, the lay H is the axial length of a complete turn of the helix formed by the three strands.
As shown in fig. 7, the helix angle β is the acute angle between the cylindrical spiral and the cylindrical line passing through the tangent point on the cylindrical surface, i.e., +.abc. The length S before twisting is the length of a certain section of twisted wire corresponding to the cylindrical spiral line after being unfolded. The length Z after twisting is the axial length of a cylindrical spiral line corresponding to a certain section of twisted wire.
Blanking length before twisting E: the pre-stranding blanking length e=the pre-stranding length s+the sum of the untwisted lengths of both ends (m+n).
Length F of finished product after stranding: twisted finished length f=twisted length z+sum of untwisted lengths (m+n) of both ends, referring to fig. 5, fig. 5 shows twisted finished length of the three strands.
2. Modeling the spatial structure of the three strands.
Referring to fig. 7, a triangle stretched by a cylindrical spiral of three strands may result in the following geometric relationship:
referring to fig. 8, from the cross section of the three strands, three elliptic curves can be obtained, the three ellipses have the same elliptic focal length, and the following geometrical relationship exists between the ellipses:
the standard equation for the first ellipse (the ellipse in the second quadrant in fig. 8) is:
the standard equation for the second ellipse (ellipse with the major axis on the x-axis in fig. 8) is:
In the above formulas (1) to (5), H represents the lay length, Δh represents the lay length error caused by the change in the outer diameter of the wire, a represents the wire diameter, d represents the inner cylindrical diameter, β represents the helix angle, L represents the distance of the cylindrical helix from the cylindrical axis, and c represents the elliptical focal length. When the helix angle beta is set, the ratio of the lay length H to the wire diameter a is set. As shown in fig. 8, the inner cylinder diameter d is the diameter of the cylinder formed in the triple strand.
Since the first ellipse and the second ellipse are along a straight lineAxisymmetric, both tangent to the straight line +.>Will beIn conjunction with equation (4), a circle can be calculatedThe distance L of the column helix from the column axis is:
the simultaneous expression (2) and the expression (6) can be calculated to obtain d as:
the co-equations (1) and (6) can be calculated to obtain cos β as:
equation (9) can be derived from equation (8), and equation (10) can be derived from equation (9):
in the above formula (10), Δa represents an error caused by a change in the outer diameter of the wire.
3. And (5) calculating parameters in the process of processing the three strands.
The pitch density degree of stranded wires with different specifications is consistent by fixing the spiral angle, namely, the length after stranding/length before stranding is a fixed value, controlling the ratio (relative value) of two variables to be a fixed value, and further calculating the blanking length before stranding.
Based on the cosine value of the spiral angle of the ratio of the length after twisting to the length before twisting, the following formula (11) is constructed to obtain a calculation formula (12) of the blanking length E before twisting of the three strands and a twisting distance error delta H caused by blanking errors E Is calculated by the calculation formula (13).
In the formulas (11) to (13), E represents the blanking length before twisting, F represents the finished product length after twisting, deltaE represents the blanking error before twisting, H represents the twisting pitch H, deltaH E The lay length error caused by the blanking error before twisting is represented by N, the untwisted length of the left end is represented by N, and the untwisted length of the right end is represented by M.
As shown in table one, an example of the geometry parameters of a set of three-strand finished product processes is given.
Example of geometry parameters of surface three-stranded wire finished product processing process
As shown in table one, by fixing the spiral angle β, that is, the ratio of the length Z after twisting to the length S before twisting is a fixed value, the twisting distances corresponding to different wire specifications can be calculated, so that the degree of the density of the twisted joints of the three twisted wires with different wire specifications is consistent, and the blanking length E and the twisting distance error before twisting of the three twisted wires are calculated.
The lay-length error mainly comprises blanking error, equipment rotation number error (which may not exist and can be reduced) and artificial measurement error. For the three stranded wires with the length smaller than 1000mm, the lay length can be adjusted by changing the blanking length for a plurality of times to reduce the lay length error; for the three strands with the length larger than 1000mm, the strand pitch error is equally divided by a large number of strands, and the three strands are smaller and easy to control.
As shown in table two, a set of calculation examples of three-strand geometry parameters are given.
Calculation example of geometric structure parameters in process of processing surface two-three stranded wires
Taking the processing parameters corresponding to the number 1 in the second table as an example, the specification of the electric wire is 3 x 0.75mm 2 The twisted wire of (2) is processed to obtain a three-stranded wire with a lay length H of 35.0mm and a finished product length F of 1000mm after twisting, and the lay length H and the wire specification are 3 x 0.75mm under the conditions that the untwisted length N at the left end and the untwisted length M at the right end are both 50mm and the blanking error delta E is +5mm 2 The corresponding wire diameter is substituted into the formula (9) to calculate the helix angle beta, then the helix angle beta, the twisted finished product length F, the left untwisted length N, the right untwisted length M and the blanking error delta E are substituted into the formula (12), the pre-twisted blanking length E of the three twisted wires is 1010.30mm, the pre-twisted blanking length E, the twisting distance H, the left untwisted length N, the right untwisted length M and the blanking error delta E are substituted into the formula (13), and the twisting distance error delta H caused by the blanking error can be calculated E Is +0.19mm.
It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Based on the same inventive concept, the embodiment of the application also provides a three-stranded wire pre-stranding blanking length determining device for realizing the three-stranded wire pre-stranding blanking length determining method. The implementation scheme of the device for solving the problem is similar to that described in the above method, so the specific limitation in the embodiment of the device for determining the pre-twisting blanking length of one or more three-stranded wires provided below can be referred to the limitation of the method for determining the pre-twisting blanking length of the three-stranded wires hereinabove, and will not be repeated here.
In one embodiment, as shown in fig. 9, there is provided a pre-stranding blanking length determining apparatus 900 of three strands, including: an acquisition module 902 and a determination module 904, wherein:
and an acquisition module 902 for determining wire diameters of three twisted wires to be subjected to the twisting process, the three twisted wires having the same wire specification.
The obtaining module 902 is further configured to obtain a preset lay length, a twisted finished length of the three twisted wires, and a terminal length of the twisted wire.
And the determining module 904 is configured to determine ellipses formed by each stranded wire in a cross section of the three stranded wires in a preset state, wherein each two adjacent ellipses are in a tangential state.
The determining module 904 is further configured to determine the target helix angle based on an axisymmetric line between two ellipses thereof, an expression of one of the ellipses related to the axisymmetric line, a preset lay length, and a wire diameter.
The determining module 904 is further configured to determine a pre-twisted length of the stranded wire according to the target helix angle and the post-twisted length by differentiating the post-twisted finished length from the terminal length of the stranded wire to obtain the post-twisted length of the stranded wire.
The determining module 904 is further configured to determine a pre-twisted blanking length of the three twisted wires based on the pre-twisted length and the terminal length of the twisted wire.
In one embodiment, one of the ellipses associated with the axisymmetric line is a first ellipse, and the determining module 904 is further configured to determine a distance between the cylindrical spiral corresponding to any one of the stranded wires and the cylindrical axis, and construct a first function according to a relationship among the distance, the lay, and the helix angle; carrying out simultaneous solving on the expression based on the axisymmetric line and the expression of the first ellipse to obtain a second function, wherein the second function represents the relationship among the distance, the wire diameter and the helix angle; and calculating the target spiral angle according to the first function and the second function.
In one embodiment, the pre-twisted length is the length of a straight line formed by expanding a cylindrical spiral line corresponding to the twisted wire, the post-twisted length is the axial length of the cylindrical spiral line corresponding to the twisted wire, and the determining module 904 is further configured to determine a cosine value of the target spiral angle, and a ratio of the post-twisted length to the cosine value of the target spiral angle is used as the pre-twisted length of the twisted wire.
In one embodiment, the determining module 904 is further configured to calculate a sum of the pre-twisted length and the terminal length of the stranded wire, and to use a difference between the sum of the pre-twisted length and the terminal length of the stranded wire and a preset blanking error as the pre-twisted blanking length of the three strands.
In one embodiment, the pre-twisted blanking length determining apparatus 900 of the three-twisted wire further includes an error calculating module, where the error calculating module is configured to determine a ratio between a preset twisting distance and a wire diameter according to the first function and the second function; taking a preset first lay error threshold value, and calculating to obtain an electric wire diameter error threshold value according to the ratio of the preset lay to the electric wire diameter and the first lay error threshold value; and triggering the three stranded wires with the blanking lengths before stranding to carry out stranding treatment under the condition that the error specification of the stranded wires is within the range of the wire diameter error threshold value, so as to obtain three stranded wires.
In one embodiment, the error calculation module is further configured to obtain a preset second lay error threshold; constructing a third function of a second lay length error variable based on the product of a blanking error variable and a preset lay length and the ratio of the product to the pre-lay length, wherein the pre-lay length is the length of a straight line formed after a cylindrical spiral line corresponding to a stranded wire is unfolded; under the condition that the second lay error variable is the second lay error threshold value, solving the value of the blanking error variable according to a third function to obtain the blanking error threshold value; and triggering to twist three twisted wires with the blanking length before twisting under the condition that the blanking error is smaller than the blanking error threshold value, so as to obtain three twisted wires.
All or part of each module in the three-stranded wire pre-stranding blanking length determining device can be realized by software, hardware and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a terminal, and an internal structure diagram thereof may be as shown in fig. 10. The computer device includes a processor, a memory, an input/output interface, a communication interface, a display unit, and an input means. The processor, the memory and the input/output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input/output interface. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The input/output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program, when executed by a processor, implements a method for determining a pre-twisted blanking length of a three-twisted wire. The display unit of the computer equipment is used for forming a visual picture, and can be a display screen, a projection device or a virtual reality imaging device, wherein the display screen can be a liquid crystal display screen or an electronic ink display screen, the input device of the computer equipment can be a touch layer covered on the display screen, can also be a key, a track ball or a touch pad arranged on a shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in fig. 10 is merely a block diagram of some of the structures associated with the present application and is not limiting of the computer device to which the present application may be applied, and that a particular computer device may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the steps of the method embodiments described above when the computer program is executed.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when executed by a processor, implements the steps of the method embodiments described above.
In an embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the steps of the method embodiments described above.
It should be noted that, the user information (including, but not limited to, user equipment information, user personal information, etc.) and the data (including, but not limited to, data for analysis, stored data, presented data, etc.) referred to in the present application are information and data authorized by the user or sufficiently authorized by each party, and the collection, use and processing of the related data are required to comply with the related laws and regulations and standards of the related countries and regions.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the various embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magnetic random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (Phase Change Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like. The databases referred to in the various embodiments provided herein may include at least one of relational databases and non-relational databases. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processors referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic units, quantum computing-based data processing logic units, etc., without being limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.

Claims (9)

1. A method for determining a pre-twisted blanking length of a three-twisted wire, the method comprising:
determining wire diameters of three stranded wires to be subjected to stranding, wherein the three stranded wires have the same wire specification;
acquiring a preset lay length, the finished product length of the twisted three strands and the terminal length of the twisted wire;
determining ellipses formed by each stranded wire in the cross section of the three stranded wires in a preset state, wherein each two adjacent ellipses are in a tangent state;
Determining a target helix angle based on an axisymmetric line between two of the ellipses, an expression of one of the ellipses associated with the axisymmetric line, the preset lay length, and the wire diameter;
the twisted finished product length is differed from the terminal length of the twisted electric wire, the twisted length of the twisted electric wire is obtained, and the pre-twisted length of the twisted electric wire is determined according to the target helix angle and the twisted length;
and determining the pre-stranding blanking length of the three stranded wires based on the pre-stranding length and the terminal length of the stranded wires.
2. The method of claim 1, wherein one of the ellipses associated with the axis of symmetry is a first ellipse, and wherein determining the target helix angle based on the axis of symmetry between two of the ellipses, the expression of one of the ellipses associated with the axis of symmetry, the preset lay length, and the wire diameter comprises:
determining the distance between a cylindrical spiral line corresponding to any section of the stranded wire and a cylindrical axis, and constructing a first function according to the relation among the distance, the lay length and the spiral angle;
carrying out simultaneous solving based on the expression of the axisymmetric line and the expression of the first ellipse to obtain a second function, wherein the second function characterizes the relation among the distance, the wire diameter and the helix angle;
And calculating to obtain a target spiral angle according to the first function and the second function.
3. The method of claim 1, wherein the pre-twisted length is a length of a straight line formed by expanding a cylindrical spiral corresponding to the twisted wire, the post-twisted length is an axial length of the cylindrical spiral corresponding to the twisted wire, and the determining the pre-twisted length of the twisted wire according to the target helix angle and the post-twisted length includes:
and determining the cosine value of the target helix angle, and taking the ratio of the twisted length to the cosine value of the target helix angle as the twisted length of the stranded wire.
4. The method of claim 3, wherein the determining the pre-twisted blanking length of the three strands based on the pre-twisted length and the terminal length of the twisted wire comprises:
and calculating the sum of the pre-twisting length and the terminal length of the twisted wire, and taking the difference between the sum of the pre-twisting length and the terminal length of the twisted wire and a preset blanking error as the pre-twisting blanking length of the three twisted wires.
5. The method according to claim 2, wherein the method further comprises:
determining a ratio between a preset lay length and a wire diameter according to the first function and the second function;
Acquiring a preset first lay error threshold value, and calculating to obtain an electric wire diameter error threshold value according to the ratio of the preset lay to the electric wire diameter and the first lay error threshold value;
and triggering the three stranded wires with the blanking lengths before stranding to carry out stranding treatment to obtain three stranded wires under the condition that the error specification of the stranded wires is within the wire diameter error threshold range.
6. The method according to claim 4, wherein the method further comprises:
acquiring a preset second lay error threshold;
constructing a third function of a second lay length error variable based on the product of a blanking error variable and a preset lay length and the ratio of the product to the pre-lay length, wherein the pre-lay length is the length of a straight line formed by expanding a cylindrical spiral line corresponding to a stranded wire;
under the condition that the second lay error variable is the second lay error threshold, solving the value of the blanking error variable according to the third function to obtain a blanking error threshold;
and triggering to twist three twisted wires with the blanking length before twisting under the condition that the blanking error is smaller than the blanking error threshold value, so as to obtain three twisted wires.
7. A pre-lay length determination apparatus for a three-strand wire, the apparatus comprising:
the device comprises an acquisition module, a twisting module and a twisting module, wherein the acquisition module is used for determining the wire diameters of three twisted wires to be twisted, and the three twisted wires have the same wire specification;
the acquisition module is also used for acquiring preset pitches, the twisted finished product length of the three twisted wires and the terminal length of the twisted wires;
the determining module is used for determining ellipses formed by each stranded wire in the cross section of the three stranded wires in a preset state, wherein each two adjacent ellipses are in a tangent state;
the determining module is further configured to determine a target helix angle based on an axisymmetric line between two ellipses thereof, an expression of one of ellipses related to the axisymmetric line, the preset lay length, and the wire diameter;
the determining module is further configured to determine a pre-twisted length of the stranded wire according to the target helix angle and the post-twisted length by differentiating the post-twisted finished length and the terminal length of the stranded wire to obtain the post-twisted length of the stranded wire;
the determining module is further used for determining the pre-stranding blanking length of the three stranded wires based on the pre-stranding length and the terminal length of the stranded wires.
8. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 6 when the computer program is executed.
9. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 6.
CN202210647738.1A 2022-06-09 2022-06-09 Method and device for determining blanking length of three twisted wires before twisting and computer equipment Active CN114914035B (en)

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DE4124841A1 (en) * 1991-07-26 1993-01-28 Rheydt Kabelwerk Ag Multilayer cable - has layers with same lay and structured lay lengths for equal shift if the cable is twisted
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