CN114914035A

CN114914035A - Method and device for determining blanking length of three-stranded wire before twisting and computer equipment

Info

Publication number: CN114914035A
Application number: CN202210647738.1A
Authority: CN
Inventors: 周录尧; 李海林; 郭红; 胡瑞霞; 李国辉; 车明明
Original assignee: FAW Jiefang Automotive Co Ltd
Current assignee: FAW Jiefang Automotive Co Ltd
Priority date: 2022-06-09
Filing date: 2022-06-09
Publication date: 2022-08-16
Anticipated expiration: 2042-06-09
Also published as: CN114914035B

Abstract

The application relates to a method and a device for determining the pre-twisting blanking length of a three-stranded wire, computer equipment, a storage medium and a computer program product. The method includes 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 twisting pitch, the length of a twisted finished product of the three twisted wires and the length of a terminal of a twisted wire; determining ellipses formed by all stranded wires in the cross section of the three stranded wires in a preset state, wherein every two adjacent ellipses are in a tangent state; determining a target spiral angle based on an axial symmetry line between two ellipses, an expression of one of the ellipses related to the axial symmetry line, a preset lay length and a wire diameter; and determining the post-twisting length and the pre-twisting length of the twisted electric wire and determining the pre-twisting blanking length of the three twisted wires according to the target spiral angle, the post-twisting finished product length and the terminal length of the twisted electric wire. By adopting the method, the blanking length of the three stranded wires before twisting can be quantized.

Description

Method and device for determining blanking length of three stranded wires before twisting and computer equipment

Technical Field

The application relates to the technical field of electric wire processing, in particular to a method and a device for determining the pre-twisting blanking length of a three-stranded wire, computer equipment, a storage medium and a computer program product.

Background

With the development of the wire processing technology, particularly in the field of three-stranded wire processing, in the processing process of mutually twisting three insulated metal wires according to a certain density degree to manufacture a three-stranded wire finished product, the blanking length before twisting treatment needs to be considered, material waste is caused by overlong blanking, the three-stranded wire finished product fails due to overlong blanking, and therefore, the accurate calculation of the blanking length before twisting of the three-stranded wire is an important guarantee for producing the three-stranded wire.

However, the existing three-stranded wire processing method only gives the range of the lay length corresponding to the finished length of the three-stranded wire, and does not consider how to accurately calculate the blank length before twisting corresponding to the finished length of the three-stranded wire when the stranded wire is subjected to the blank processing before twisting, so that the problem that the blank length before twisting of the three-stranded wire cannot be quantized exists.

Disclosure of Invention

In view of the above, it is necessary to provide a method, an apparatus, a computer device, a computer readable storage medium, and a computer program product for determining a pre-twisting blanking length of a three-stranded wire, which can quantify the pre-twisting blanking length of the three-stranded wire.

In a first aspect, the application provides a method for determining the 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 processing, wherein the three stranded wires have the same wire specification;

acquiring a preset twisting pitch, the finished product length of the twisted three-stranded wire and the terminal length of the twisted wire;

determining ellipses formed by all stranded wires in the cross section of the three stranded wires in a preset state, wherein every two adjacent ellipses are in a tangent state;

determining a target spiral angle based on an axial symmetry line between two ellipses, an expression of one of the ellipses related to the axial symmetry line, a preset lay length and a wire diameter;

making a difference between the length of the stranded finished product and the length of a terminal of the stranded wire to obtain the stranded length of the stranded wire, and determining the pre-stranded length of the stranded wire according to the target helical angle and the stranded length;

and determining the pre-twisting blanking length of the three stranded wires based on the pre-twisting length and the terminal length of the stranded wire.

In one embodiment, the one of the ellipses associated with the axial symmetry line is a first ellipse, and the determining the target spiral angle based on the axial symmetry line between the two ellipses, the expression of the one of the ellipses associated with the axial symmetry line, the preset lay length and the wire diameter includes: determining the distance between a cylindrical spiral line corresponding to any section of a 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; performing simultaneous solution on the expression based on the axial symmetry 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 spiral angle; and calculating the target spiral angle according to the first function and the second function.

In one embodiment, the pre-twisted length is a length of a straight line formed after a cylindrical spiral line corresponding to a twisted wire is unfolded, 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, and the method includes: and determining a cosine value of the target spiral angle, and taking the ratio of the stranded length to the cosine value of the target spiral angle as the pre-stranded length of the stranded electric wire.

In one embodiment, determining the pre-twist blanking length of the three-strand wire based on the pre-twist length and the terminal length of the stranded wire comprises: and calculating the sum of the pre-twisting length and the terminal length of the twisted wire, and taking the difference value of 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 the ratio of the preset lay length to the diameter of the wire according to the first function and the second function; acquiring a preset first twist distance error threshold, and calculating to obtain a wire diameter error threshold according to a preset ratio between the twist distance and the wire diameter and the first twist distance error threshold; and under the condition that the error specification of the stranded wires is within the range of the wire diameter error threshold value, triggering to carry out stranding processing on the three stranded wires with the blanking length before stranding to obtain three stranded wires.

In one embodiment, the method further comprises: acquiring a preset second lay length error threshold; constructing a third function of a second lay length error variable based on the product of the blanking error variable and a preset lay length and the ratio of the lay length 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 length error variable is the second lay length error threshold, solving the value of the blanking error variable according to a third function to obtain a blanking error threshold; and under the condition that the blanking error is smaller than the blanking error threshold value, triggering to perform twisting processing on three twisted electric wires with blanking lengths before twisting to obtain three twisted wires.

In a second aspect, the application further provides a device for determining the blanking length of the three stranded wires before twisting. The device comprises:

the obtaining module is used for determining the wire diameters of three stranded wires to be subjected to stranding processing, and the three stranded wires have the same wire specification;

the acquisition module is also used for acquiring the preset twisting pitch, the finished product length of the three twisted wires after twisting and the terminal length of the twisted electric wire;

the determining module is used for determining an ellipse formed by each stranded wire in the cross section of the three stranded wires in a preset state, wherein every two adjacent ellipses are in a tangent state;

the determining module is further used for determining a target spiral angle based on an axial symmetry line between two ellipses, an expression of one of the ellipses related to the axial symmetry line, a preset lay length and a wire diameter;

the determining module is further used for making a difference between the length of the stranded finished product and the length of the terminal of the stranded electric wire to obtain the stranded length of the stranded electric wire, and determining the pre-stranded length of the stranded electric wire according to the target spiral angle and the stranded length;

and 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 implementing the following steps when executing the computer program:

the difference is made between the length of the stranded finished product and the length of the terminal of the stranded electric wire to obtain the stranded length of the stranded electric wire, and the pre-stranded length of the stranded electric wire is determined according to the target spiral angle and the stranded length;

In a fourth aspect, the present application further 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:

acquiring a preset twisting pitch, the length of a twisted finished product of the three twisted wires and the length of a terminal of a twisted wire;

In a fifth aspect, the present application further provides a computer program product. The computer program product comprising a computer program which when executed by a processor performs the steps of:

The method, the device, the computer equipment, the storage medium and the computer program product for determining the pre-twisting blanking length of the three stranded wires determine the wire diameters of three stranded wires to be twisted, and the three stranded wires have the same wire specification; acquiring a preset twisting pitch, the length of a twisted finished product of the three twisted wires and the length of a terminal of a twisted wire; determining ellipses formed by all stranded wires in the cross section of the three stranded wires in a preset state, wherein every two adjacent ellipses are in a tangent state; determining a target spiral angle corresponding to the three stranded wires in a preset state based on an axial symmetry line between two ellipses, an expression of one of the ellipses related to the axial symmetry line, a preset lay length and a wire diameter; and then, determining the blanking length of the three stranded wires before twisting based on the target spiral angle, the finished product length of the three stranded wires after twisting and the terminal length of the stranded wires, so that the purpose of quantifying the blanking length of the three stranded wires before twisting can be achieved based on preset wire diameters, twisting pitches, the finished product length of the three stranded wires after twisting and the terminal length of the stranded wires before twisting of the three stranded wires to obtain the finished product of the three stranded wires, and the accurate control of the blanking length of the processing equipment before twisting in the processing process of the three stranded wires is realized.

Drawings

FIG. 1 is an application environment diagram of a method for determining a pre-twisting blanking length of a three-strand cable in one embodiment;

FIG. 2 is a schematic flow chart of a method for determining a pre-twisting blanking length of a three-strand cable in one embodiment;

FIG. 3A is a schematic diagram of a twisted wire and a right-hand twist of a three-strand wire according to one embodiment;

FIG. 3B is a schematic diagram of left hand stranding of stranded wires and three-strand wires in one embodiment;

FIG. 4 is a schematic diagram of the lay lengths of three strands in one embodiment;

FIG. 5 is a schematic diagram of the length of a finished three-strand cable in one embodiment;

FIG. 6 is a flow chart illustrating the step of determining a target spiral angle in one embodiment;

FIG. 7 is a schematic diagram showing the expansion of a cylindrical helix according to one embodiment;

FIG. 8 is a schematic cross-sectional view of a three-strand wire in one embodiment;

FIG. 9 is a block diagram of a device for determining a pre-twisting blanking length of a three-strand wire in one embodiment;

FIG. 10 is a diagram showing an internal structure of a computer device according to an embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

The method for determining the blanking length before twisting of the three stranded wires provided by the embodiment of the application can be applied to the 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 the cloud or other network server. The terminal 102 may independently execute the method for determining the blanking length before twisting of the three-stranded wire provided by the embodiment of the present application, and the terminal 102 and the server 104 may also cooperatively execute the method for determining the blanking length before twisting of the three-stranded wire provided by the embodiment of the present application.

When the terminal 102 independently executes the method for determining the pre-twisting blanking length of the three-stranded wire, the terminal 102 determines the wire diameters of three stranded wires to be twisted, and the three stranded wires have the same wire specification; acquiring a preset twisting pitch, the length of a twisted finished product of the three twisted wires and the length of a terminal of a twisted wire; determining ellipses formed by all stranded wires in the cross section of the three stranded wires in a preset state, wherein every two adjacent ellipses are in a tangent state; determining a target spiral angle based on an axial symmetry line between two ellipses, an expression of one of the ellipses related to the axial symmetry line, a preset lay length and a wire diameter; the difference is made between the length of the stranded finished product and the length of the terminal of the stranded electric wire to obtain the stranded length of the stranded electric wire, and the pre-stranded length of the stranded electric wire is determined according to the target spiral angle and the stranded length; and determining the pre-twisting blanking length of the three stranded wires based on the pre-twisting length and the terminal length of the stranded wire.

When the terminal 102 and the server 104 cooperatively execute a method for determining the pre-twisting blanking length of a three-stranded wire, the terminal 102 determines the wire diameters of three stranded wires to be twisted, and the three stranded wires have the same wire specification; the preset lay length, the finished length of the three stranded wires after stranding and the terminal length of the stranded wire are obtained, and the wire diameter, the preset lay length, the finished length of the three stranded wires after stranding and the terminal length of the stranded wire are sent to the server 104. The server 104 determines an ellipse formed by each stranded wire in a cross section of the three stranded wires in a preset state, wherein every two adjacent ellipses are in a tangent state; determining a target spiral angle based on an axial symmetry line between two ellipses, an expression of one of the ellipses related to the axial symmetry line, a preset lay length and a wire diameter; the difference is made between the length of the stranded finished product and the length of the terminal of the stranded electric wire to obtain the stranded length of the stranded electric wire, and the pre-stranded length of the stranded electric wire is determined according to the target spiral angle and the stranded length; and determining the pre-twisting blanking length of the three stranded wires based on the pre-twisting length and the terminal length of the stranded wire.

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, and the internet of things devices may be smart speakers, smart televisions, smart air conditioners, smart car-mounted devices, and the like. The portable wearable device can be a smart watch, a smart bracelet, a head-mounted device, and the like. The server 104 may be implemented as a stand-alone server or as a server cluster comprised of multiple servers.

It should be understood that the terms "first," "second," "third," and the like as used in the 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 referents 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 wire is a most commonly used transmission medium in the integrated wiring engineering, and is generally formed by mutually winding three mutually insulated metal wires, and has 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 cable, and the three-stranded cable is generally directly called as a three-stranded cable. The application of the three-stranded wire includes but is not limited to a CAN wire, and CAN also include a control wire of an engine fuel injector nozzle, a control wire of an actuator, a connecting wire harness of a sensor and the like.

In one embodiment, as shown in fig. 2, a method for determining the pre-twisting blanking length of a three-stranded wire is provided, and the method may be executed by a terminal or a server alone, or may be executed by the terminal and the server in cooperation. The embodiment of the present application is described by taking the application of the method to the terminal in fig. 1 as an example, and includes the following steps:

step 202, determining the wire diameters of three stranded wires to be stranded, the three stranded wires having the same wire gauge.

Among them, the stranded wire is an insulated metal wire, such as an insulated copper wire, for performing a stranding process to constitute a three-stranded wire. By winding three stranded wires placed in parallel so as to cross each other, a three-stranded wire as shown in fig. 3 can be obtained. The three-stranded wire has a three-stranded helical line structure, and the three-stranded helical line is a space structure formed by sweeping three cylindrical helical lines which have phase differences of 120 degrees in sequence and are axially symmetric with each other along a circular section. The cylindrical spiral line is a track formed by a moving point rotating around the axis of a cylindrical surface at a constant speed and moving along the axis at a constant speed.

Referring to fig. 3A and 3B, the twisting direction includes a left-hand twisting or a right-hand twisting. When the visible part of the cylindrical spiral forms a letter Z with two cross sections limiting it, as shown in fig. 3A, it is called right-hand twisting; when the visible portion of the cylindrical helix forms the letter S with two cross-sections bounding it, as shown in fig. 3B, it is said to be twisted left. The stranded wires and the three stranded wires have the same twisting direction, and the twisting direction of the three stranded wires is consistent with that of the three stranded wires. When the twist direction of the three stranded wires is different from the twist direction of the three stranded wires, for example, the twist direction of the three stranded wires is left-hand twisted, and the twist direction of the three stranded wires is right-hand twisted, in this case, the internal structure of the stranded wires may be damaged, so the present embodiment can ensure the quality of the finished stranded three stranded wires by keeping the twist direction of the three stranded wires consistent with the twist direction of the three stranded wires.

The wire gauge of the stranded wire is specified in accordance with industry standards, and industry standards also specify a certain correspondence between the wire gauge and the wire diameter, for example when the wire gauge of the stranded wire is 2 x 0.35mm ² The wire diameter a of the stranded wire is about 1.3mm, and the wire gauge of the stranded wire is 2 x0.5mm ² The wire diameter a of the stranded wire is about 1.5 mm.

Specifically, for three stranded electric wires to be subjected to a stranding process, the terminal determines the electric wire diameters a of the three stranded electric wires to be subjected to the stranding process in correspondence with the electric wire specifications and the electric wire diameters based on the electric wire specifications of the stranded electric wires, the three stranded electric wires having the same electric wire specification, stranding direction and length.

And step 204, acquiring preset twisting pitch, the length of a twisted finished product of the three twisted wires and the length of a terminal of the twisted wire.

The lay length is the axial distance of at least one full turn of helix formed by the three strands, i.e. the lay length is at least three times the distance between three adjacent twisted knots. The twisted joint is a twisted joint of three twisted wires forming the three twisted wires, and the larger the twisting distance is, the more sparsely the twisted joint interval of the three twisted wires is, otherwise, the tighter the twisted joint interval is. As shown in fig. 4, H denotes a lay length of three strands, the twisted nodes of the three strands are equidistantly spaced, and the lay length H is three times the distance between two adjacent twisted nodes.

The preset lay length H' is a lay length of a three-stranded wire formed by stranding three stranded wires to be subjected to a stranding process.

As shown in fig. 5, the twisted product length F of the three-stranded wire is the length of any twisted wire after the twisting process, that is, the length of the three-stranded wire product twisted by three twisted wires. The terminal length of the twisted electric wire is the length of the part of any twisted electric wire without twisting treatment at both ends, and includes the left end untwisted length of any twisted electric wire and the right end untwisted length of any twisted electric wire. When three stranded wires are stranded to obtain a finished product of the three stranded wires, two ends, namely left ends and right ends, of the three stranded wires are used as fixed ends and are not stranded, parts between the left ends and the right ends of the three stranded wires are stranded to obtain the three stranded wires, and the stranding distance of the three stranded wires, the length of the finished product of the three stranded wires and the length of a terminal of the stranded wires are preset.

Specifically, the terminal acquires a preset lay length H', a finished length F after stranding of three strands, and a terminal length (M + N) of a stranded wire.

And step 206, determining ellipses formed by the stranded wires in the cross section of the three stranded wires in the preset state, wherein every two adjacent ellipses are tangent.

The preset state is that the stranding state of the three stranded wires meets the following conditions: in three ellipses formed by three stranded wires in the cross section of the three stranded wires, every two ellipses are tangent. The three-stranded wire is in a preset state, so that the quality of a finished product of the three-stranded wire can be ensured, and the problems that the service life of the three-stranded wire is short and the like due to the fact that a twisted section is too loose or too tight are solved.

Specifically, the terminal determines three ellipses formed by three stranded wires in the cross section of the three stranded wires in a preset state, wherein every two adjacent ellipses are tangent.

And step 208, determining a target spiral angle based on the axial symmetry line between two ellipses, the expression of one of the ellipses related to the axial symmetry line, the preset twist pitch and the wire diameter.

The axial symmetry line is an axial symmetry line between any two of three ellipses in a cross section of the three stranded wires in a preset state, and the two ellipses are tangent to the axial symmetry line. The target helix angle β' is a helix angle corresponding to the three strands in a preset state, and the helix angle is an acute angle formed 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 the three strands in a preset state based on an axial symmetry line between two of the ellipses, an expression of one of the ellipses related to the axial symmetry line, a preset lay length H' and a wire diameter a.

And step 210, obtaining the stranded length of the stranded electric wire by making a difference between the stranded finished product length and the terminal length of the stranded electric wire, and determining the pre-stranded length of the stranded electric wire according to the target spiral angle and the stranded length.

The twisted length Z of the twisted electric wire is the length of any twisted electric wire after the twisting treatment of the part of the twisted electric wire between the left end and the right end of the twisted electric wire. The stranded length Z of the stranded wire is the difference between the stranded product length F of the three stranded wires and the terminal length (M + N) of the stranded wire. The pre-twisting length S of the twisted electric wires is a length of a portion of any one of the twisted electric wires between the left and right ends of the twisted electric wires before the twisting process. The ratio of the post-twist length Z to the pre-twist length S of the twisted wire is proportional to the helix angle, and is a fixed value when the helix angle is the target helix angle β'.

Specifically, the terminal makes the difference between the stranded finished length F and the terminal length (M + N) of the stranded electric wire to obtain the stranded length Z of the stranded electric wire; and determining the pre-twist length S of the twisted electric wire according to the target spiral angle beta' and the post-twist length Z and the proportional relation between the ratio of the post-twist length Z to the pre-twist length S of the twisted electric wire and the spiral angle.

And step 212, determining the pre-twisting blanking length of the three stranded wires based on the pre-twisting length and the terminal length of the stranded wire.

When the blanking error is not considered, the pre-twisting length S of the twisted electric wire is the difference between the pre-twisting blanking length E of the three twisted wires and the terminal length (M + N) of the twisted electric wire.

Specifically, the terminal calculates the sum of the pre-twisting length S and the terminal length (M + N) of the twisted wire, and determines the pre-twisting blanking length E of the three twisted wires according to the sum of the pre-twisting length S and the terminal length (M + N) of the twisted wire.

In the method for determining the pre-twisting blanking length of the three-stranded wire, the diameters of the electric wires of three stranded wires to be subjected to twisting treatment are determined, and the three stranded wires have the same electric wire specification; acquiring a preset twisting pitch, the length of a twisted finished product of the three twisted wires and the length of a terminal of a twisted wire; determining ellipses formed by all stranded wires in the cross section of the three stranded wires in a preset state, wherein every two adjacent ellipses are in a tangent state; determining a target spiral angle corresponding to the three stranded wires in a preset state based on an axial symmetry line between two ellipses, an expression of one of the ellipses related to the axial symmetry line, a preset lay length and a wire diameter; and then, determining the blanking length of the three stranded wires before twisting based on the target spiral angle, the finished product length of the three stranded wires after twisting and the terminal length of the stranded wires, so that the purpose of quantifying the blanking length of the three stranded wires before twisting can be achieved based on preset wire diameters, twisting pitches, the finished product length of the three stranded wires after twisting and the terminal length of the stranded wires before twisting of the three stranded wires to obtain the finished product of the three stranded wires, and the accurate control of the blanking length of the processing equipment before twisting in the processing process of the three stranded wires is realized.

In one embodiment, as shown in fig. 6, the one of the ellipses associated with the axial symmetry line is a first ellipse, and the determining the target spiral angle based on the axial symmetry line between the two ellipses, the expression of the one of the ellipses associated with the axial symmetry line, the preset lay length and the wire diameter includes:

step 602, determining a distance between a cylindrical spiral line corresponding to any one segment of the stranded wires and a cylindrical axis, and constructing a first function according to a relationship among the distance, the lay length and the spiral angle.

Specifically, as shown in fig. 7, after determining an ellipse formed by each stranded wire in a cross section of the three stranded wire in a preset state, wherein each two adjacent ellipses are in a tangent state, determining a cylindrical helix corresponding to any section of any stranded wire, taking an axial distance of at least one whole helix in the cylindrical helices as a lay length H of the three stranded wire, and taking an included angle ([ ABC ])) between a straight line formed after the cylindrical helix is unfolded and a cylindrical axis as a helix angle β. The terminal determines the circumferential length 2 pi 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 β as the quotient between the circumferential length and the lay length H to construct a first function representing the relationship between the helix angle β, the lay length H and the distance L of the cylindrical helix from the cylindrical axis, which can be expressed by the following formula:

and step 604, performing simultaneous solution on the expression based on the axial symmetry 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 spiral angle.

The first ellipse is one of the ellipses related to the axial symmetry line, the axial symmetry line is tangent with the first ellipse, and the axial symmetry line is also tangent with the second ellipse at the same time. The expression of the axial symmetry line is an equation of the axial 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 whose major axis is on the x-axis. At this time, the axisymmetric line between the first ellipse and the second ellipse is a straight line

The first ellipse and the second ellipse are tangent to the straight line

I.e. the expression of the axial symmetry line is

The length of the major axis of the first ellipse is the ratio of the wire diameter a to the cosine of the helix angle cos β, the length of the minor axis is the wire diameter a, and the standard equation of the first ellipse is:

in particular, the terminal is based on an expression of an axial symmetry line

And (4) simultaneously solving with the expression (4) of the first ellipse to obtain a second function, the second function characterizing a relationship among the distance, the wire diameter, and the helix angle, the second function being represented by the following formula:

in one embodiment, expressions based on axisymmetric lines

Solving, in parallel with expression (4) of the first ellipse, a second function represented by formula (3), including: the terminal will

Substituting the equation (4) to obtain a linear equation of two elements about x, solving the discriminant of the root of the linear equation of two elements about x, taking the discriminant of the root as zero, and calculating to obtain a second function represented by the equation (6).

And 606, calculating to obtain 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 a first function represented by formula (1) and a second function represented by formula (6), and the target helix angle β' can be calculated by combining 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 and the second function, sets the value of the second function to be zero, and calculates the target helical angle β' corresponding to the three stranded wires in the preset stranding state by combining the first function and the second function.

In this embodiment, after determining the ellipses formed by the twisted wires in the cross section of the three twisted wires in the preset state, wherein each two adjacent ellipses are in a tangent state, the distance between the cylindrical spiral line corresponding to any one section of the twisted wires and the cylindrical axis is determined, a first function is constructed according to the relationship among the distance, the lay length and the spiral angle, a second function is constructed by performing simultaneous solution on the expression of the axial symmetry line and the expression of the first ellipse, and the wire diameter and the preset lay length are substituted into the first function and the second function to perform the joint solution, so that the purpose of determining the target spiral angle based on the axial symmetry line between any two ellipses, the expression of one of the ellipses related to the axial symmetry line, the preset lay length and the wire diameter can be achieved.

In addition, in the conventional processing method, the stranded wires having different wire specifications are usually fixedly arranged at the same lay length, for example, the wire specification is 3 × 0.5mm ² 、3x0.75mm ² 、3x1.5mm ² The lay lengths of the three stranded wires are all set to be 35mm, which can cause inconsistent density degree of stranded sections, and the specification of the electric wire is 3x0.5mm ² The twisted section of the three stranded wires is too loose, and the specification of the electric wire is 3x1.5mm ² The twisted sections of the three stranded wires are too tight, the insulation is possibly twisted and damaged, and the three stranded wires are not ideal in both over-thin and over-dense states, so that the traditional processing method also has the problem that the twisted sections of the three stranded wires formed by twisting the twisted wires with different wire specifications cannot be consistent in density. In this embodiment, the target spiral angles corresponding to the three stranded wires in the preset state can be determined based on the wire diameters and the preset spiral pitches, so that when the target spiral angles are fixed values, the spiral pitches corresponding to the wire specifications can be calculated for the stranded wires with different wire specifications, and the effect that the twisted pitch density degrees of the three stranded wires formed by twisting the stranded wires with different wire specifications are consistent is achieved.

In one embodiment, the pre-twisted length is a length of a straight line formed after a cylindrical spiral line corresponding to the twisted wire is unfolded, 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, and the method includes: and determining a cosine value of the target spiral angle, and taking the ratio of the stranded length to the cosine value of the target spiral angle as the pre-stranded length of the stranded electric wire.

In the right triangle ABC shown in fig. 7, the pre-twisted length S is the length of a straight line formed after a cylindrical spiral line corresponding to any twisted wire is unfolded, the post-twisted length Z is the axial length of the cylindrical spiral line corresponding to any twisted wire, and the cosine value cos β 'of the target spiral angle β' is the ratio of the post-twisted length Z to the pre-twisted length S.

Specifically, the terminal determines a cosine value cos β 'of the target helix angle, calculates a ratio of the post-twist length Z to the cosine value cos β' of the target helix angle, and takes the ratio of the post-twist length Z to the cosine value cos β 'of the target helix angle as the pre-twist length S of the twisted wire, i.e., S ═ Z/cos β'.

In this embodiment, by fixing the target helix angle, the purpose of calculating the pre-twisted length of the twisted electric wire based on the target helix angle and the post-twisted length of the twisted electric wire can be achieved according to the ratio of the post-twisted length to the pre-twisted length as the cosine value of the target helix angle.

In one embodiment, determining a pre-twist blanking length for a three-strand wire based on a pre-twist length, a terminal length of a twisted wire, comprises: and calculating the sum of the pre-twisting length and the terminal length of the twisted wire, and taking the difference value of 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. And after determining the preset blanking error delta E ', the terminal selects the processing equipment with the blanking error meeting the 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 device and the preset blanking error Δ E' is smaller than a blanking error threshold, which is not limited in this embodiment. The blanking length E of the three stranded wires before stranding is the length of any stranded wire before stranding.

Specifically, the terminal calculates the pre-twisting blanking length E of the three stranded wires 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 Δ E' is the preset blanking error.

In this embodiment, the difference between the sum of the pre-twisting length and the terminal length of the twisted wire and the preset blanking error is used as the pre-twisting blanking length of the three twisted wires, so that the purpose of determining the pre-twisting blanking length of the three twisted wires based on the pre-twisting 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 pre-twisting blanking length of the three-stranded wire further comprises the steps of determining the ratio of the preset twisting pitch to the diameter of the wire according to the first function and the second function; acquiring a preset first twist distance error threshold, and calculating to obtain a wire diameter error threshold according to a preset ratio between the twist distance and the wire diameter and the first twist distance error threshold; and under the condition that the error specification of the stranded wires is within the wire diameter error threshold range, triggering to carry out stranding processing on the three stranded wires with the blanking length before stranding to obtain three stranded wires.

The first lay length error threshold is a threshold of the first lay length error variable delta H, and can be preset according to production requirements of finished three-stranded wire products. The first lay error variable is the lay error due to the change in wire diameter. The wire diameter error threshold value is a threshold value of the wire diameter error variable Δ a of the theoretically twisted wire, 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 an upper threshold value, the wire diameter error threshold value range may be smaller than the wire diameter error threshold value. The error specification of the stranded electric wire is an actual error specification of the stranded electric wire to be subjected to the stranding process.

Specifically, the terminal obtains the following formula according to the first function and the second function whose value is zero:

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

The terminal obtains a preset first twist distance error threshold value, the preset ratio between the twist distance H' and the wire diameter a are substituted into the following formula (10), and the wire diameter error threshold value is obtained through calculation:

in the formula (10), Δ H is a first twist pitch error variable, Δ a is a wire diameter error variable, H is a twist pitch, and a is a wire diameter. The terminal acquires the error specification of the stranded wires, judges whether the error specification of the stranded wires is in the threshold range corresponding to the wire diameter error threshold value or not, and triggers the processing equipment to carry out stranding processing on the three stranded wires with the pre-stranding blanking length E determined by the method embodiment under the condition that the error specification of the stranded wires is in the threshold range corresponding to the wire diameter error threshold value, so as to obtain three stranded wires.

In this embodiment, the purpose of determining the wire diameter error threshold value can be achieved by obtaining the preset first lay length error threshold value, according to the preset ratio between the lay length and the wire diameter and the first lay length error threshold value, so that the three stranded wires with the pre-lay blanking length determined by the method embodiment can be triggered to be stranded to obtain the three stranded wires under the condition that the error specification of the stranded wires is within the range of the wire diameter error threshold value, accurate control of the machining equipment on the lay length error caused by the wire diameter error in the three stranded wire machining process is realized, and the improvement of the quality of the finished three stranded wires is facilitated.

In one embodiment, the method for determining the blanking length before twisting of the three stranded wires further comprises the steps of obtaining a preset second lay length error threshold; constructing a third function of a second lay length error variable based on the product of the blanking error variable and a preset lay length and the ratio of the lay length 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 length error variable is the second lay length error threshold, solving the value of the blanking error variable according to a third function to obtain a blanking error threshold; and under the condition that the blanking error is smaller than the blanking error threshold value, triggering to perform twisting processing on three twisted electric wires with blanking lengths before twisting to obtain three twisted wires.

Wherein the second lay length error variable Delta H _E Is the lay length error generated by the change of the blanking length before twisting. The second lay length error threshold is a second lay length error variable Δ H _E The threshold value of (2) can be preset according to the production requirements of the finished three-stranded wire product. The blanking error threshold is a threshold of a theoretical blanking error variable Δ E. A third function representing a second lay error variable Δ H _E The relationship between the blanking error variable delta E, the lay length H and the pre-lay length can be represented by the following formula:

in the formula (13), Δ H _E Is the second lay length error variable, delta E is the blanking error variable, H is the lay length, and (E-N-M) is the pre-lay length. The length before twisting is the length of a straight line formed after a cylindrical spiral line corresponding to the twisted electric wire is unfolded.

Specifically, the terminal obtains a preset second lay length error threshold, substitutes the second lay length error threshold, the pre-lay length (E-N-M) and the preset lay length H' into the formula (13), and calculates to obtain the blanking error threshold. And the terminal judges whether the preset blanking error delta E 'is smaller than a blanking error threshold value or not, and triggers the processing equipment to perform twisting processing on the three twisted electric wires with the blanking lengths E before twisting determined by the method embodiment under the condition that the preset blanking error delta E' is smaller than the blanking error threshold value, so as to obtain three twisted electric wires.

In this embodiment, the purpose of determining the blanking error threshold value can be achieved by obtaining the preset second lay length error threshold value and according to the second lay length error threshold value, the pre-lay length and the preset lay length, so that the twisted wire with the pre-lay blanking length determined by the method embodiment can be triggered to be twisted to obtain the three-stranded wire under the condition that the preset blanking error is smaller than the blanking error threshold value, thereby realizing accurate control of the machining equipment on the lay length error caused by the blanking error in the three-stranded wire machining process and contributing to improvement of the quality of a finished three-stranded wire product.

In one embodiment, a method for determining the blanking length before stranding of three stranded wires is provided, and the method comprises the following steps:

firstly, defining geometric structure parameters of the three strands.

Cylindrical spiral line: a moving point rotates around the axis of a cylindrical surface at a constant speed and moves along the axis at a constant speed, and the track of the moving point is called a cylindrical spiral line.

Three-twisted helix: the circular section is in a space structure formed by sweeping three cylindrical spiral lines which have phase difference of 120 degrees and are axially symmetrical with each other in sequence.

The automobile three-stranded wire is in a three-stranded cylindrical spiral wire structure. The twist direction of the three strands and the twist direction of the twisted wires are the same. For the conductor of the electric wire, the direction of rotation of the twisted electric wire with respect to the axis of the electric wire is referred to as the twist direction. Referring to fig. 3A and 3B, when the visible portion of the helix forms the letter Z with the two cross-sections bounding it, it is referred to as right-hand twisting, and when they form the letter S, it is referred to as left-hand twisting. Likewise, there are also strand directions for three strands, namely a right strand Z and a left strand S.

As shown in fig. 4, the lay length H is the axial length of a full turn of helix formed by the three strands.

As shown in fig. 7, the helix angle β is an acute angle, i.e., < ABC, on the cylindrical surface between the cylindrical helix and the cylindrical surface straight line passing through the tangent point. The length S before twisting is the length of a cylindrical spiral line corresponding to a certain twisted wire after being unfolded. The length Z after twisting is the axial length of the cylindrical spiral line corresponding to a certain twisted wire.

Blanking length E before twisting: the pre-twisting blanking length E is the sum of the pre-twisting length S + the length of the non-twisted ends (M + N).

The length F of the finished product after twisting: the finished product length F after stranding is the sum (M + N) of the length Z after stranding and the length Z without stranding at both ends, and referring to fig. 5, fig. 5 shows the finished product length after stranding of three strands.

And secondly, modeling the space structure of the three stranded wires.

Referring to fig. 7, a triangle formed by a cylindrical helix of three strands, the following geometrical relationships can be obtained:

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 ellipses have the following geometrical relationship:

the standard equation for the first ellipse (the ellipse located in the second quadrant in FIG. 8) is:

the standard equation for the second ellipse (the ellipse with the major axis on the x-axis in FIG. 8) is:

in the above equations (1) to (5), H represents the lay length, Δ H represents the lay length error resulting from the change in the outer diameter of the wire, a represents the diameter of the wire, d represents the diameter of the inner cylinder, β represents the helix angle, L represents the distance of the helix of the cylinder from the axis of the cylinder, and c represents the focal length of the ellipse. When the helix angle beta is a set value, the ratio of the lay length H to the wire diameter a is a fixed value. As shown in fig. 8, the inner cylinder diameter d is the diameter of the cylinder formed in the three strands.

Because the first ellipse and the second ellipse are along a straight line

Axisymmetric, both tangent to a straight line

Will be provided with

In conjunction with equation (4), the distance L between the cylindrical helix and the cylindrical axis can be calculated as:

by combining equation (2) and equation (6), d can be calculated as:

by combining the formula (1) and the formula (6), cos β can be calculated as:

from equation (8), equation (9) can be derived, and from equation (9), equation (10) can be derived:

in the above equation (10), Δ a represents an error caused by a change in the outer diameter of the electric wire.

And thirdly, calculating parameters of the three-stranded-wire processing process.

The blanking length before twisting is calculated by fixing the helical angle, namely the length after twisting/the length before twisting is a fixed value, and controlling the ratio (relative value) of the two variables to be the fixed value, so that the density degrees of twisted sections of twisted wires with different specifications are consistent.

Constructing the following formula (11) based on the ratio of the length after twisting to the length before twisting as the cosine value of the helical angle, obtaining a calculation formula (12) of the blanking length E of the three twisted wires before twisting and a twisting pitch error delta H caused by the blanking error _E The calculation formula (13).

In the above formulas (11) to (13), E represents the blanking length before twisting, F represents the finished product length after twisting, Δ E represents the blanking error before twisting, H represents the twisting pitch H, and Δ H _E And representing a lay length error caused by a blanking error before stranding, wherein N represents the left-end untwisted length N, and M represents the right-end untwisted length.

As shown in table one, an example of the geometric parameters during the processing of a set of three-strand finished products is given.

Table-three strand finished product processing geometry parameter example

As shown in table one, by fixing the helix angle β, that is, the ratio of the length Z after twisting to the length S before twisting is a fixed value, the twist pitches corresponding to different wire specifications can be calculated, so that the twist pitch density degrees of the three stranded wires of different wire specifications are consistent, and further the blanking length E before twisting and the twist pitch error of the three stranded wires are calculated.

The lay length error mainly comprises a blanking error, an equipment rotation circle number error (possibly not existing and reducible) and an artificial measurement error. For three stranded wires with the length of less than 1000mm, the lay length error can be reduced by changing and adjusting the blanking length for multiple times; for three stranded wires with the length of more than 1000mm, the lay length error is equally divided by a large number of strands, needs to be smaller, and is easy to control.

As shown in table two, an example of the calculation of a set of three-strand geometry parameters is given.

Calculation example of geometric structure parameters in table two-three stranded wire processing process

Taking the processing parameters corresponding to the number 1 in the second table as an example, the specification of the electric wire is 3x 0.75mm ² The twisted electric wire is processed to obtain a three-twisted wire with the twisting pitch H of 35.0mm and the finished product length F of 1000mm after twisting, and under the conditions that the left end untwisted length N and the right end untwisted length M are both 50mm and the blanking error delta E is +5mm, according to the method for determining the blanking length before twisting of the three-twisted wire, the twisting pitch H and the specification of the electric wire are 3x 0.75mm firstly ² Substituting the corresponding wire diameter into the formula (9), calculating to obtain a spiral angle beta, substituting the spiral angle beta, the finished product length F after twisting, the left end untwisted length N, the right end untwisted length M and the blanking error delta E into the formula (12), calculating to obtain the blanking length E before twisting of the three-stranded wire of 1010.30mm, and substituting the blanking length E before twisting, the twisting pitch H, the left end untwisted length N, the right end untwisted length M and the blanking error delta E into the formula (12)With the formula (13), the lay length error Δ H caused by the blanking error can be calculated _E Is +0.19 mm.

It should be understood that, although the steps in the flowcharts related to the embodiments as described above are sequentially displayed as indicated by arrows, the steps are not necessarily performed sequentially as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a part of the steps in the flowcharts related to the embodiments described above may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the execution order of the steps or stages is not necessarily sequential, but may be rotated or alternated with other steps or at least a part of the steps or stages in other steps.

Based on the same inventive concept, the embodiment of the application also provides a device for determining the blanking length before twisting of the three stranded wires, which is used for realizing the method for determining the blanking length before twisting of the three stranded wires. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the method, so that specific limitations in the following embodiment of the device for determining the pre-twisting blanking length of one or more three-stranded wires can be referred to the limitations on the method for determining the pre-twisting blanking length of the three-stranded wires, and are not described herein again.

In one embodiment, as shown in fig. 9, there is provided a three-strand pre-twisting blanking length determining apparatus 900, including: an obtaining module 902 and a determining module 904, wherein:

an obtaining module 902 is configured to determine wire diameters of three stranded wires to be stranded, the three stranded wires having a same wire gauge.

The obtaining module 902 is further configured to obtain a preset lay length, a finished length of the twisted three-strand wires, and a terminal length of the twisted electric wires.

And a determining module 904, configured to determine an ellipse formed by each twisted wire in a cross section of the three twisted wires in a preset state, where every two adjacent ellipses are tangent to each other.

The determining module 904 is further configured to determine the target spiral angle based on an axial symmetry line between two ellipses, an expression of one of the ellipses related to the axial symmetry line, a preset lay length, and a wire diameter.

The determining module 904 is further configured to obtain a stranded length of the stranded wire by subtracting the stranded finished length from the terminal length of the stranded wire, and determine a pre-stranded length of the stranded wire according to the target helix angle and the post-stranded length.

The determining module 904 is further configured to determine a pre-twisted blanking length of the three-stranded wire based on the pre-twisted length and the terminal length of the twisted wire.

In one embodiment, one of the ellipses related to the axial symmetry line is a first ellipse, and the determining module 904 is further configured to determine a distance between a cylindrical spiral line corresponding to any one of the twisted wires and the cylindrical axis, and construct a first function according to a relationship among the distance, the lay length, and the spiral angle; performing simultaneous solution on the expression based on the axial symmetry 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 spiral angle; and calculating the target spiral angle according to the first function and the second function.

In one embodiment, the pre-twisted length is a length of a straight line formed after the cylindrical spiral line corresponding to the twisted wire is unfolded, the post-twisted length is an 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 use a ratio of the post-twisted length to the cosine value of the target spiral angle 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-twist length and the terminal length of the twisted wire, and to use a difference between the sum of the pre-twist length and the terminal length of the twisted wire and a preset blanking error as the pre-twist blanking length of the three-stranded wire.

In one embodiment, the apparatus 900 for determining the pre-twisting blanking length of the three-stranded wire further includes an error calculation module, configured to determine a ratio between a preset twisting pitch and the wire diameter according to the first function and the second function; taking a preset first twist distance error threshold, and calculating to obtain a wire diameter error threshold according to a preset ratio between the twist distance and the wire diameter and the first twist distance error threshold; and under the condition that the error specification of the stranded wires is within the wire diameter error threshold range, triggering to carry out stranding processing on the three stranded wires with the blanking length before stranding to obtain three stranded wires.

In one embodiment, the error calculation module is further configured to obtain a preset second lay length error threshold; constructing a third function of a second lay length error variable based on the product of the blanking error variable and a preset lay length and the ratio of the lay length 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 length error variable is the second lay length error threshold, solving the value of the blanking error variable according to a third function to obtain a blanking error threshold; and under the condition that the blanking error is smaller than the blanking error threshold value, triggering to perform twisting processing on three twisted electric wires with blanking lengths before twisting to obtain three twisted wires.

All or part of each module in the device for determining the blanking length of the three stranded wires before twisting can be realized by software, hardware and the combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.

In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 10. The computer apparatus includes a processor, a memory, an input/output interface, a communication interface, a display unit, and an input device. The processor, the memory and the input/output interface are connected by a system bus, and the communication interface, the display unit and the input device are connected by the input/output interface to the system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile 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 an operating system and computer programs in the non-volatile storage medium. The input/output interface of the computer device is used for exchanging information between the processor and an 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 communication can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program is executed by a processor to realize a method for determining the pre-twisting blanking length of the three-stranded 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, 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, 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.

Those skilled in the art will appreciate that the architecture shown in fig. 10 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those 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 above-described method embodiments when executing the computer program.

In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.

In an embodiment, a computer program product is provided, comprising a computer program which, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.

It should be noted that, the user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed 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 need to comply with the relevant laws and regulations and standards of the relevant country and region.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the 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 (MRAM), Ferroelectric Random Access Memory (FRAM), Phase Change Memory (PCM), graphene Memory, and the like. Volatile Memory can include Random Access Memory (RAM), external cache Memory, and the like. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), for example. The databases referred to in various embodiments provided herein may include at least one of relational and non-relational databases. The non-relational database may include, but is not limited to, a block chain 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 devices, quantum computing based data processing logic devices, etc., without limitation.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. A method for determining the blanking length of a three-stranded wire before stranding is characterized by comprising the following steps:

determining the wire diameters of three stranded wires to be subjected to a stranding process, the three stranded wires having the same wire gauge;

determining a target spiral angle based on an axial symmetry line between two ellipses, an expression of one of the ellipses related to the axial symmetry line, the preset lay length and the wire diameter;

obtaining the stranded length of the stranded wire by making a difference between the stranded finished product length and the terminal length of the stranded wire, and determining the pre-stranded length of the stranded wire according to the target spiral angle and the post-stranded length;

2. The method of claim 1, wherein the one of the ellipses associated with the axial symmetry line is a first ellipse, and wherein determining the target pitch angle based on the axial symmetry line between the two of the ellipses, the expression of the one of the ellipses associated with the axial symmetry line, the preset lay length, and the wire diameter comprises:

determining the distance between a cylindrical spiral line corresponding to any section of a stranded wire and a cylindrical axis, and constructing a first function according to the relationship among the distance, the lay length and the spiral angle;

performing simultaneous solution on the expression of the axial symmetry 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 spiral angle;

and calculating to obtain the 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 the unfolded cylindrical spiral corresponding to the twisted wires, the post-twisted length is an axial length of the cylindrical spiral corresponding to the twisted wires, and the determining the pre-twisted length of the twisted wires according to the target spiral angle and the post-twisted length comprises:

and determining the cosine value of the target spiral angle, and taking the ratio of the stranded length to the cosine value of the target spiral angle as the pre-stranded length of the stranded electric wire.

4. The method of claim 3, wherein determining a pre-twist blanking length for a three-strand wire based on the pre-twist length and a terminal length of a stranded 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 of claim 2, further comprising:

determining a ratio of a preset lay length to the diameter of the wire according to the first function and the second function;

acquiring a preset first twist distance error threshold, and calculating to obtain a wire diameter error threshold according to the ratio of the preset twist distance to the wire diameter and the first twist distance error threshold;

and under the condition that the error specification of the stranded electric wire is within the electric wire diameter error threshold value range, triggering to carry out stranding processing on the three stranded electric wires with the blanking lengths before stranding to obtain a three-stranded wire.

6. The method of claim 4, further comprising:

acquiring a preset second lay length error threshold;

constructing a third function of a second lay length error variable based on the product of the blanking error variable and a preset lay length and the ratio of 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 length error variable is the second lay length error threshold, solving the value of the blanking error variable according to the third function to obtain a blanking error threshold;

and under the condition that the blanking error is smaller than the blanking error threshold value, triggering to perform twisting processing on the three stranded wires with the blanking lengths before twisting to obtain three stranded wires.

7. The device for determining the pre-twisting blanking length of the three stranded wire is characterized by comprising the following components:

an acquisition module for determining wire diameters of three stranded wires to be subjected to a stranding process, the three stranded wires having the same wire specification;

the acquisition module is also used for acquiring the preset twisting distance, the length of a twisted finished product of the three twisted wires and the length of a terminal of a twisted wire;

the determining module is further configured to determine a target spiral angle based on an axial symmetry line between two ellipses, an expression of one of the ellipses related to the axial symmetry line, the preset lay length, and the wire diameter;

the determining module is further configured to obtain a difference between the length of the stranded finished product and the length of the terminal of the stranded wire to obtain a stranded length of the stranded wire, and determine a pre-stranded length of the stranded wire according to the target helical angle and the stranded length;

the determining module is further 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 wire.

8. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 6.

9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 6.

10. A computer program product comprising a computer program, characterized in that the computer program realizes the steps of the method of any one of claims 1 to 6 when executed by a processor.