CN113158277A

CN113158277A - Fastener selecting method and system

Info

Publication number: CN113158277A
Application number: CN202110281640.4A
Authority: CN
Inventors: 金士兵; 巩霞平; 赵虹虹; 李俊明; 徐进; 王娟; 于小喆
Original assignee: BEIJING RAINFE TECHNOLOGY CO LTD
Current assignee: BEIJING RAINFE TECHNOLOGY CO LTD
Priority date: 2020-05-19
Filing date: 2021-03-16
Publication date: 2021-07-23
Anticipated expiration: 2041-03-16
Also published as: CN113158277B; CN111783183A

Abstract

The invention provides a fastener selecting method and a fastener selecting system, which are characterized in that fastener information is collected in advance to establish a fastener database, a fastener selecting knowledge base is established, after matching rules of fasteners are solidified, a model of equipment to be selected for selecting the fasteners is established through a three-dimensional modeling tool, then fastener mounting points are generated on the model, connecting parts corresponding to the mounting points are selected, interlayer thickness of the connecting parts is calculated, finally, fastener data are called, and fastener combinations of the fixed mounting points are selected quickly and accurately according to the fastener matching rules in the fastener selecting knowledge base. The method and the system get rid of the traditional mode that the manual needs to be searched for in the past for assembling the fastener, and the selection of the fastener number depends on the experience, realize the automatic and intelligent selection of the fastener combination based on the fastener database and the knowledge base, greatly improve the efficiency of the assembly design of the fastener, reduce the threshold of the assembly design of the fastener, and reduce the design errors.

Description

Fastener selecting method and system

Technical Field

The present invention relates to the equipment manufacturing industry and, more particularly, to a fastener selection method and system.

Background

The assembly of the fastener is an important part in the research and development of equipment manufacturing enterprises, and due to the fact that the number of the fasteners involved in the assembly design process of the fastener is large, and the limitations of the existing design means and technology, the improvement of the assembly design efficiency and the improvement of the assembly design level of the fastener are seriously hindered, and the design period of a product is too long. The conventional fastener design has the following problems: firstly, the fastener data management is not structured, and a fastener manual needs to be manually searched; secondly, common knowledge reasoning is not formed for selecting the fasteners, and the fasteners need to be selected one by one; thirdly, the fastener selection has no knowledge flow and is not intelligent enough; fourthly, the classical selection and combination of the fasteners do not realize multiplexing, the knowledge is not inherited, and specifically:

in the prior art, the assembly design of a part of fasteners in the equipment manufacturing industry is completely defined in a manual mode, a designer manually calculates the interlayer thickness of a connecting part at each mounting point position, a fastener manual is consulted, the efficiency is very low, or an enterprise with a fastener database only uses standard data used inside the enterprise, the data formats among enterprises are not standard and uniform, a large amount of fastener data are not used for supporting, the universality is poor, the selected fasteners are calculated manually, fastener marks meeting the mounting conditions are selected according to experience, whether the selected fasteners meet the standard requirements or not and whether the matching relations among the fasteners are matched or not are judged only according to the experience of the designer, and errors are very easy.

Still other companies have developed fastener selection tools in a three-dimensional environment for fastener assembly design. After selecting the mounting point, the fastener is selected, the fastener type is selected, and all data in the fastener type is opened. The data of the called fastener is the data stored in the local EXCEL table. The basic code, the subdivision code, the diameter code and the fastener code are manually selected. After the main fastening piece is manually selected, the fitting and the gasket are automatically selected, and all manual selections are selected based on manually calculated fastening piece combinations. The disadvantage of this approach is that fastener data does not implement digital structured management; the selection of the provided fasteners in each step requires the user to select the type of the fastener, the basic code, the subdivision code, the diameter grade and the grade of the fastener. The selection of fasteners is based on selection in software, but does not incorporate fastener matching knowledge and intelligent fastener knowledge reasoning.

Disclosure of Invention

In order to solve the technical problems that digital structural management is not realized on the assembly design of a fastener in the prior art, and related matching knowledge and intelligent fastener knowledge reasoning are not integrated in the selection of the fastener, the invention provides a fastener selection method, which comprises the following steps:

selecting a fastener mounting point of the equipment from a pre-established equipment model, and selecting a connecting part corresponding to the mounting point;

calculating the interlayer thickness of the connecting part according to the mounting point of the fastener and the connecting part;

calling a pre-established fastener database, and selecting a first fastener type of the connecting part from a generated first fastener type list, wherein the fastener database comprises fastener numbers and fastener information corresponding to the fastener numbers, and the fastener numbers comprise basic codes, diameter codes and brand numbers;

randomly selecting a base code of a first fastener from a first fastener base code list generated according to the selected first fastener type;

randomly selecting a first fastener diameter code in a first fastener diameter code list generated according to the selected first fastener base code;

randomly selecting a second fastener grade from a second fastener grade list generated according to the nominal diameter of the first fastener corresponding to the selected first fastener diameter code, wherein the selected second fastener meets the preset second fastener matching rule;

when a third fastener is determined to be selected according to first fastener information corresponding to the selected first fastener diameter code and second fastener information corresponding to the selected second fastener grade, randomly selecting a third fastener grade from a generated third fastener grade list, wherein the third fastener in the third fastener grade list meets a preset third fastener matching rule;

selecting first fastener information corresponding to each first fastener grade in a first fastener grade list generated according to the nominal diameter corresponding to the selected first fastener diameter code, second fastener information corresponding to the selected second fastener grade, and the interlayer thickness of the connecting part, and selecting the first fastener grade meeting the first fastener length verification rule in the first fastener grade list generated according to the nominal diameter corresponding to the selected first fastener diameter code;

a combination generated based on the selected first fastener grade, second fastener grade, and third fastener grade selects an optimal fastener type result for the device connecting part.

Further, before the method selects a fastener mounting point of the equipment in a pre-established equipment model and selects a connecting part corresponding to the mounting point, the method further comprises:

establishing a model of equipment to be used for selecting a fastener by adopting a modeling tool, and generating a fastener mounting point on the model of the equipment;

establishing a fastener database, wherein the database divides fasteners into first fasteners, second fasteners and third fasteners, establishes four-level database table association for the first fasteners, establishes three-level database table association for the second fasteners and the third fasteners, a first-level form of the four-level database table manages first fastener basic code information, the basic code information comprises a first fastener basic code, a name, a fastener type, a head type and a unit system, a second-level form manages first fastener subdivided code information, the subdivided code information comprises a first fastener subdivided code, a basic code, a name, a material, a surface processing mode and an installation direction, a third-level form manages first fastener diameter code information, and the diameter code information comprises a first fastener subdivided code, a diameter code, a nominal diameter, a head size, The hole information and the fourth-level form manage the grade information of the first fastener, and the grade information comprises the diameter code of the first fastener, the grade, the clamping thickness, the total length and the mounting position; the first-level form of the third-level database table manages basic code number data of a second fastener and a third fastener, the basic code number data comprises basic code numbers, names, fastener types, head types and unit systems of the second fastener and the third fastener, the second-level form manages subdivision code number data of the second fastener and the third fastener, the subdivision code number data comprises subdivision code numbers, basic code numbers, names, materials, surface processing modes and installation directions of the second fastener and the third fastener, the third-level form manages brand number data of the second fastener and the third fastener, and the brand number data comprises brand numbers, nominal diameters, outer diameters, hole information, lengths, thicknesses, groove information, thread gaps and installation positions of the second fastener and the third fastener; the first fastener is a fastener which is necessary to be provided in a fastener selection combination, the second fastener is a fastener which is matched with the first fastener to fasten the connecting part, and the third fastener is a fastener which is installed on the first fastener and the second fastener based on the special structures of the first fastener and the second fastener;

establishing a fastener selection knowledge base, wherein the fastener selection knowledge base comprises a second fastener matching rule matched with a first fastener, selecting a third fastener rule of a third fastener matched with the first fastener and the second fastener according to the information of the first fastener and the second fastener, and selecting a first fastener length check rule that the length of the first fastener can be matched with the length of a first fastener after determining the second fastener combined with the first fastener according to the second fastener matching rule, wherein:

when the second fastener comprises a washer and does not comprise a tray nut and a rivet, the matching rule of the washer is that the nominal diameter of the washer is equal to the nominal diameter of the first fastener, or the nominal diameter of the second fastener is larger than or equal to the nominal diameter of the first fastener; the matching rule of the second fastener except the washer is that the nominal diameter of the second fastener is equal to the nominal diameter of the first fastener;

when the second fastening piece comprises a tray nut, a rivet and a washer, the matching rule of the tray nut is that the nominal diameter of the tray nut is equal to the nominal diameter of the first fastening piece, the matching rule of the rivet is that the nominal diameter of the rivet is equal to the nominal diameter of the rivet in a tray nut number table, and the matching rule of the washer matched with the rivet is that the nominal diameter of the washer is equal to the nominal diameter of the rivet, or the nominal diameter of the washer is more than or equal to the nominal diameter of the rivet; the matching rule of the washer matched with the first fastener is that the nominal diameter of the washer is equal to the nominal diameter of the first fastener, or the nominal diameter of the washer is larger than or equal to the nominal diameter of the first fastener;

when the first fastener is a bolt, a high-locking bolt or a screw, and a common nut is arranged in the second fastener, if the diameter of a nut hole in the nut plate number table is larger than 0, the third fastener is a fuse, and the matching rule of the third fastener is that the diameter in the fuse plate number table is smaller than the diameter of the hole in the nut plate number table;

when the first fastener is a bolt and the second fastener is provided with a nut, if the diameter of a bolt head hole of data in the bolt diameter number table is larger than 0, the third fastener is a fuse, and the matching rule of the third fastener is that the diameter in the fuse number table is smaller than the diameter of the head hole in the bolt diameter number table, wherein the nut comprises a common nut and a tray nut;

when the first fastener is a bolt and the second fastener is provided with a nut, if the diameter of a tail hole in the bolt diameter code table is larger than 0, the third fastener is a cotter pin, and the matching rule of the third fastener is as follows: when the thickness of the groove bottom of the nut plate number table is equal to 0, determining the matched cotter pin number according to the diameter and the length in the cotter pin number table, the diameter of the tail hole in the bolt diameter number table and the nominal diameter; when the thickness of the groove bottom of the nut number plate is larger than 0, determining the matched cotter number plate according to the diameter and the length in the cotter number plate, the diameter of a tail hole in the bolt diameter number plate, and the outer diameter, the thickness, the groove width and the groove bottom thickness of a nut in the nut number plate, wherein the nut comprises a common nut and a tray nut;

when the first fastener is a bolt or a high-locking bolt, and the second fastener is a common nut and a washer, or the first fastener is a high-locking bolt, and the second fastener is a high-locking nut and a washer, or the first fastener is a bolt, and the second fastener is a tray nut, a rivet and a washer, the first fastener length check rule is as follows: determining a matched first fastener number according to the interlayer thickness of a connecting part, the clamping thickness and the total length of a first fastener in a first fastener number table, the thickness of a washer in a head washer number table, the thickness of a washer in a tail washer number table, the thread clearance and the nut thickness in a nut number table and the set thread extension amount, wherein the head washer and the tail washer comprise washers connected with the first fastener and washers connected with rivets;

when the first fastener is a screw and the second fastener is a common nut and a washer, or the first fastener is a screw and the second fastener is a tray nut, a rivet and a washer, the first fastener length check rule is as follows: determining a matched first fastener number according to the interlayer thickness of a connecting part, the length and the total length of a first fastener polish rod in a first fastener number table, the thickness of a washer in a head washer number table, the thickness of a washer in a tail washer number table, the thread clearance and the nut thickness in a nut number table and the set thread extension amount, wherein the head washer and the tail washer comprise washers connected with a first fastener and washers connected with rivets;

when the first fastener is a ring groove nail or a rivet and a washer is arranged in the second fastener, the first fastener length verification rule is as follows: according to the interlayer thickness of the connecting part, the clamping thickness of a first fastener in a first fastener number table, the gasket thickness in a head gasket number table and the gasket thickness in a tail gasket number table determine a matched first fastener number;

when the first fastener is a bolt or a screw and the second fastener is a tray nut, a rivet and a washer, the rivet serving as the second fastener determines the most appropriate rivet mark for clamping the thickness according to a first fastener length verification rule, wherein the first fastener length verification rule is as follows: calculating the interlayer thickness of the rivet connection parts according to the set number of the rivet connection parts; according to the determined interlayer thickness of the rivet connecting part, the clamping thickness corresponding to each rivet mark in a rivet mark list corresponding to the selected nominal diameter of the rivet, the tray thickness in a tray nut mark list, the gasket thickness in the tail gasket mark matched with the first fastener, the gasket thickness in the head gasket mark list matched with the rivet and the gasket thickness in the tail gasket mark list matched with the rivet, the matched rivet mark is determined.

Further, when the first fastener is a bolt and the second fastener has a nut, if the diameter of the tail hole in the bolt diameter code table is greater than 0, the third fastener is a cotter pin, and the third fastener matching rule includes:

when the groove bottom thickness of nut tablet table equals 0, wherein:

calculating the minimum length and the maximum length of the cotter pin to be selected, wherein the calculation formulas are respectively as follows:

maximum length of cotter pin ═ nominal diameter of bolt + pi (nominal diameter of bolt/2)

Cotter minimum length ═ bolt nominal diameter + pi × (bolt nominal diameter/6);

selecting a cotter number with the diameter smaller than the diameter of a tail hole in a bolt diameter code table and the length of a cotter larger than the minimum length of the cotter and smaller than the maximum length of the cotter, generating a cotter number list to be selected according to the selected cotter number in descending order and ascending order of the diameter in the cotter number table, and selecting any cotter number from the cotter number list to complete cotter matching;

when the tank bottom thickness of nut tablet number table is greater than 0, wherein:

calculating the minimum length and the maximum length of the cotter pin to be selected, wherein the calculation formula is as follows:

maximum length of cotter pin ═ nut external diameter + pi (nut external diameter/2)

Cotter minimum length ═ nut outside diameter + pi · (nut outside diameter/6);

the method comprises the steps of selecting a split pin diameter in a split pin number list to be smaller than the diameter of a tail hole in a bolt diameter code list, selecting a split pin diameter to be smaller than the width of a groove in a nut number list, selecting a split pin diameter to be smaller than the difference between the thickness of a nut in the nut number list and the thickness of the groove bottom, selecting a split pin length to be larger than the minimum length of the split pin and be smaller than the maximum length of the split pin and simultaneously meet the split pin number, generating a split pin number list to be selected according to the descending order and the ascending order of the diameters in the split pin number list, and selecting any one split pin number from the split pin number list to be selected to complete split pin matching.

Further, the first fastener matching rule includes:

when the first fastener is bolt or high lock bolt, and the second fastener is ordinary nut and packing ring, or the first fastener is high lock bolt, and the second fastener is high lock nut and packing ring, or the first fastener is the bolt, and the second fastener is tray nut, rivet and packing ring, wherein:

and calculating the minimum value of the total length of the first fastener to be selected, wherein the calculation formula is as follows:

the minimum total length is the thickness of the interlayer of the connecting part, the thickness of the head gasket, the thickness of the tail gasket, the thickness of the nut and the protrusion of the thread

Calculating the minimum value and the maximum value of the clamping thickness of the first fastener to be selected, wherein the calculation formula is as follows:

minimum clamping thickness being interlayer thickness of connecting part plus head gasket thickness

The maximum clamping thickness is equal to the thickness of the interlayer of the connecting part, the thickness of the head gasket, the thickness of the tail gasket and the thread clearance

When the thread of a first fastener is arranged to extend out of the surface of a connecting part and fall into a gasket, selecting a first fastener grade corresponding to the nominal diameter of the first fastener from a first fastener grade list, wherein the total length of the first fastener is greater than or equal to the minimum total length, the clamping thickness of the first fastener is greater than or equal to the minimum clamping thickness, and the first fastener grade is smaller than the maximum clamping thickness, and arranging the selected first fastener grades in an increasing order according to the total length of the first fasteners in the first fastener grade list to generate a first fastener grade list to be selected, and selecting the first fastener grade with the minimum total length from the first fastener grade list to be selected to complete first fastener matching;

when the threads of the first fasteners are arranged to extend out of the surface of the connecting part and extend out of the outer surfaces of all the washers, selecting the first fastener total length from a first fastener grade list corresponding to the nominal diameter of the first fasteners to be more than or equal to the minimum total length, clamping the first fastener grade with the thickness being more than or equal to the minimum clamping thickness, arranging the selected first fastener grades in an increasing order according to the first fastener total length in the first fastener grade list to generate a first fastener grade list to be selected, and selecting the first fastener grade with the minimum total length from the first fastener grade list to be selected to complete first fastener matching;

when the first fastener is a screw and the second fastener is a common nut and washer, or the first fastener is a screw and the second fastener is a pallet nut, rivet and washer, wherein:

the minimum total length is the interlayer thickness of the connecting part, the head gasket thickness, the tail gasket thickness, the nut thickness and the thread extension;

calculating the maximum value of the polish rod of the first fastener to be selected, wherein the calculation formula is as follows:

the maximum value of the polish rod is the interlayer thickness of the connecting part, the head gasket thickness, the tail gasket thickness and the thread clearance;

selecting a first fastener grade with the total length of a first fastener more than or equal to the minimum total length from a first fastener grade list corresponding to the nominal diameter of the first fastener, wherein the polished rod length of the first fastener is less than the maximum first fastener grade, arranging the selected first fastener grades in an increasing order according to the total length of the first fasteners in a first fastener grade list to generate a first fastener grade list to be selected, and selecting the first fastener grade with the minimum total length from the first fastener grade list to be selected to complete bolt matching;

when the first fastener is the annular groove nail or rivet, has the packing ring in the second fastener, wherein:

calculating the minimum value of the clamping thickness of the first fastener to be selected, wherein the calculation formula is as follows:

the minimum clamping thickness is the thickness of the interlayer of the connecting part, the thickness of the head gasket and the thickness of the tail gasket

Selecting a first fastener grade with the clamping thickness of a first fastener being more than or equal to the minimum clamping thickness from a first fastener grade list corresponding to the nominal diameter of the first fastener, arranging the selected first fastener grades in an increasing order according to the total length of the first fasteners in the first fastener grade list to generate a first fastener ranking list to be selected, and selecting the first fastener grade with the minimum total length from the first fastener grade list to be selected to complete first fastener matching;

when the first fastener is a bolt or a screw and the second fastener is a tray nut, a rivet and a washer, the rivet serving as the second fastener determines the most appropriate rivet grade of the clamping thickness according to the first fastener length verification rule, wherein:

calculating the interlayer thickness of the rivet connection parts according to the set number of the rivet connection parts, wherein when the number of the rivet connection parts is equal to the number of the first fastener connection parts, the interlayer thickness of the first fastener connection parts is used as the interlayer thickness of the rivet connection parts, and when the number of the rivet connection parts is less than the number of the first fastener connection parts, the sum of the interlayer thicknesses of the connection parts with the same number of the rivet connection parts as the tail part of the first fastener is used as the interlayer thickness of the rivet connection parts;

and (3) calculating the minimum value of the clamping thickness of the rivet to be selected, wherein the calculation formula is as follows:

the minimum clamping thickness is equal to the thickness of an interlayer of the rivet connecting part, the thickness of a rivet head gasket, the thickness of a rivet tail gasket, the thickness of a tray nut and the thickness of a first fastener tail gasket

Selecting a rivet grade with the rivet clamping thickness larger than or equal to the minimum clamping thickness from a rivet grade list corresponding to the nominal diameter of the rivet, arranging the selected rivet grades in an increasing sequence according to the total length of the rivet in the rivet grade list to generate a rivet grade list to be selected, and selecting the rivet grade with the minimum total length from the rivet grade list to be selected to complete rivet matching.

Further, the selecting a fastener mounting point of the equipment in a pre-established equipment model and selecting a connecting part corresponding to the mounting point comprises:

selecting one or more mounting points to be subjected to fastener installation from among the fastener mounting points of the equipment model;

and selecting the connecting parts of the one or more mounting points manually according to the selected one or more mounting points, or automatically selecting the connecting parts of the one or more mounting points according to the matching rules of the set fastener mounting points and the connecting parts.

Further, the calculating a connecting part sandwich thickness from the fastener mounting point and the connecting part comprises:

calculating the distances from the fastener mounting point to all the surfaces of the connecting part according to the selected fastener mounting point and the connecting part, comparing the distances, and determining the surface with the minimum distance from the fastener mounting point to the connecting part;

obtaining the normal direction from the firmware mounting point to the plane with the minimum distance according to the determined plane from the firmware mounting point to the minimum connecting distance;

obtaining an intersection point of a line passing through the connecting part and the connecting part according to the mounting point and the normal direction of the firmware;

calculating the distance between the firmware installation point and the intersection point, selecting the minimum distance and the maximum distance from the determined distances, and taking the intersection point corresponding to the minimum distance and the maximum distance as the closest point and the farthest point;

and calculating the distance between the closest point and the farthest point, wherein the distance is the interlayer thickness of the connecting part.

According to another aspect of the invention, there is provided a fastener selection system, the system comprising:

the device comprises a first selection unit, a second selection unit and a third selection unit, wherein the first selection unit is used for selecting a fastener mounting point of the device in a pre-established device model and selecting a connecting part corresponding to the mounting point;

a first calculation unit for calculating a connecting part sandwich thickness from the fastener mounting point and a connecting part;

the second selection unit is used for calling a pre-established fastener database and selecting a first fastener type of the connecting part from a generated first fastener type list, wherein the fastener database comprises fastener numbers and fastener information corresponding to the fastener numbers, and the fastener numbers comprise basic codes, diameter codes and brand numbers;

a third selection unit for arbitrarily selecting a base code of one first fastener in a first fastener base code list generated according to the selected first fastener type;

a fourth selection unit for arbitrarily selecting one first fastener diameter code in a first fastener diameter code list generated from the selected first fastener base code;

the fifth selection unit is used for randomly selecting one second fastener grade from a second fastener grade list generated according to the nominal diameter of the first fastener corresponding to the selected first fastener diameter code, wherein the selected second fastener meets the preset second fastener matching rule;

the sixth selection unit is used for randomly selecting a third fastener grade from a generated third fastener grade list when the third fastener is determined to be selected according to the first fastener information corresponding to the selected first fastener diameter code and the second fastener information corresponding to the selected second fastener grade, wherein the third fastener in the third fastener grade list meets a preset third fastener matching rule;

the seventh selecting unit is used for selecting the first fastener grade meeting the first fastener length verification rule from the first fastener grade list generated according to the nominal diameter corresponding to the selected first fastener diameter code, the first fastener information corresponding to each first fastener grade in the first fastener grade list generated according to the nominal diameter corresponding to the selected first fastener diameter code, the second fastener information corresponding to the selected second fastener grade and the interlayer thickness of the connecting part;

a model selection result unit for generating a combination for an optimal fastener model selection result for the device connecting part based on the selected first fastener grade, second fastener grade, and third fastener grade.

Further, the system further comprises:

the model establishing unit is used for establishing a model of equipment to be used for selecting a fastener by adopting a modeling tool and generating a fastener mounting point on the model of the equipment;

the database unit is used for establishing a fastener database, the database divides fasteners into first fasteners, second fasteners and third fasteners, four-level database table association is established for the first fasteners, three-level database table association is established for the second fasteners and the third fasteners, a first-level form of the four-level database table manages basic code information of the first fasteners, the basic code information comprises basic code numbers, names, fastener types, head types and unit systems of the first fasteners, a second-level form manages subdivided code information of the first fasteners, the subdivided code information comprises subdivided code numbers, basic code numbers, names, materials, surface processing modes and installation directions of the first fasteners, the third-level form manages diameter code information of the first fasteners, and the diameter code information comprises subdivided code numbers, diameter code numbers, first fastener subdivided code numbers, Nominal diameter, head size and hole information, wherein a fourth-level form manages first fastener grade information, and the grade information comprises a first fastener diameter code, grade, clamping thickness, total length and mounting position; the first-level form of the third-level database table manages basic code number data of a second fastener and a third fastener, the basic code number data comprises basic code numbers, names, fastener types, head types and unit systems of the second fastener and the third fastener, the second-level form manages subdivision code number data of the second fastener and the third fastener, the subdivision code number data comprises subdivision code numbers, basic code numbers, names, materials, surface processing modes and installation directions of the second fastener and the third fastener, the third-level form manages brand number data of the second fastener and the third fastener, and the brand number data comprises brand numbers, nominal diameters, outer diameters, hole information, lengths, thicknesses, groove information, thread gaps and installation positions of the second fastener and the third fastener; the first fastener is a fastener which is necessary to be provided in a fastener selection combination, the second fastener is a fastener which is matched with the first fastener to fasten the connecting part, and the third fastener is a fastener which is installed on the first fastener and the second fastener based on the special structures of the first fastener and the second fastener;

the knowledge base unit is used for establishing a fastener selection knowledge base and comprises a first matching unit, a second matching unit and a third matching unit, wherein:

the first matching unit is used for selecting a second fastener matched with the first fastener according to a second fastener matching rule, wherein:

the second matching unit is used for selecting a third fastener matched with the first fastener and the second fastener according to a third fastener rule, wherein:

the third matching unit is used for selecting the first fastener with the length capable of matching with the connecting part according to the first fastener length verification rule after the second fastener combined with the first fastener is determined according to the second fastener matching rule, wherein:

Further, the first fastener in the second matching unit is a bolt, when a nut is provided in the second fastener, if the diameter of the tail hole in the bolt diameter code table is greater than 0, the third fastener is a cotter pin, and the third fastener matching rule includes:

when the groove bottom thickness of nut tablet table equals 0, wherein:

the minimum length and the maximum length of the cotter pin to be selected are calculated according to the following formula:

Further, the first fastener matching rule of the third matching unit includes:

Further, the first selection unit includes:

a mounting point selection unit for selecting one or more mounting points to be fastener-mounted among fastener mounting points of the equipment model;

a connecting part unit for manually selecting a connecting part of the one or more mounting points according to the selected one or more mounting points, or automatically selecting a connecting part of the one or more mounting points according to a matching rule of the set fastener mounting point and connecting part.

Further, the first calculation unit includes:

a plane determination unit for calculating distances from the fastener mounting points to all the faces of the connecting parts based on the selected fastener mounting points and the connecting parts, and comparing the distances to determine a face having the smallest distance from the fastener mounting point to the connecting part;

a normal direction determining unit, configured to obtain, according to the determined firmware mounting point to a plane with a minimum connection distance, a normal direction from the firmware mounting point to the plane with the minimum distance;

a first intersection unit for obtaining an intersection of a line passing through a connection part and the connection part according to the firmware installation point and the normal direction;

a second intersection unit for calculating distances between the firmware installation point and the intersections, selecting a minimum distance and a maximum distance from the determined distances, and taking the intersection corresponding to the minimum distance and the maximum distance as a closest point and a farthest point;

and the interlayer thickness unit is used for calculating the distance between the closest point and the farthest point, and the distance is the interlayer thickness of the connecting part.

The fastener selecting method and the system provided by the technical scheme of the invention collect fastener information in advance to establish a fastener database, establish a fastener selecting knowledge base, after the matching rule of the fastener is solidified, establish a model of equipment to be selected for the fastener through a three-dimensional modeling tool, then generate a fastener mounting point on the model, select a connecting part corresponding to the mounting point, calculate the interlayer thickness of the connecting part, finally call fastener data, and quickly and accurately select a fastener combination for fixing the mounting point according to the fastener matching rule in the fastener selecting knowledge base. The fastener selecting method and the fastener selecting system get rid of the traditional mode that a manual needs to be searched for during the assembly of the conventional fastener, and the selection of the number of the fastener depends on experience, realize the automatic intelligent selection of the fastener combination based on the fastener database and the knowledge base, greatly improve the efficiency of the assembly design of the fastener, reduce the threshold of the assembly design of the fastener, enable designers at different levels to conveniently carry out the assembly design work, reduce the design errors and greatly reduce the error probability.

Drawings

A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:

FIG. 1 is a flow chart of a fastener selection method according to a preferred embodiment of the present invention;

FIG. 2 is a schematic illustration of fastener data established in accordance with a preferred embodiment of the present invention;

FIG. 3 is a flow chart of a fastener selection process according to a preferred embodiment of the present invention;

FIG. 4 is a flow chart of another fastener selection in accordance with the preferred embodiment of the present invention;

FIG. 5 is a schematic diagram of a fastener selection system according to a preferred embodiment of the present invention.

Detailed Description

The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.

Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.

FIG. 1 is a flow chart of a fastener selection method according to a preferred embodiment of the present invention. As shown in FIG. 1, the fastener selection method 100 of the preferred embodiment begins at step 101.

In step 101, a fastener database is established, wherein the database divides fasteners into first fasteners, second fasteners and third fasteners, four-level database table association is established for the first fasteners, three-level database table association is established for the second fasteners and the third fasteners, a first-level form of the four-level database table manages basic code number information of the first fasteners, the basic code number information comprises basic code numbers, names, fastener types, head types and unit systems of the first fasteners, a second-level form manages subdivided code number information of the first fasteners, the subdivided code number information comprises subdivided code numbers, basic code numbers, names, materials, surface processing modes and installation directions of the first fasteners, a third-level form manages diameter code number information of the first fasteners, and the diameter code number information comprises subdivided code numbers, diameter code numbers, nominal diameters and nominal diameters of the first fasteners, The head size, the hole information and the fourth-level form manage the grade information of the first fastener, wherein the grade information comprises the diameter code of the first fastener, the grade, the clamping thickness, the total length and the installation position; the first-level form of the third-level database table manages basic code number data of a second fastener and a third fastener, the basic code number data comprises basic code numbers, names, fastener types, head types and unit systems of the second fastener and the third fastener, the second-level form manages subdivision code number data of the second fastener and the third fastener, the subdivision code number data comprises subdivision code numbers, basic code numbers, names, materials, surface processing modes and installation directions of the second fastener and the third fastener, the third-level form manages brand number data of the second fastener and the third fastener, and the brand number data comprises brand numbers, nominal diameters, outer diameters, hole information, lengths, thicknesses, groove information, thread gaps and installation positions of the second fastener and the third fastener; the first fastener is a fastener which is necessary to be provided in a fastener selection combination, the second fastener is a fastener which is matched with the first fastener to fasten the connecting part, and the third fastener is a fastener which is installed on the first fastener and the second fastener based on the special structure of the first fastener and the second fastener.

FIG. 2 is a schematic representation of fastener data established in accordance with a preferred embodiment of the present invention. As shown in fig. 2, the fastener database manages fastener data such as navigation mark, national standard, national military standard, and American standard, and performs structured digital hierarchical management on the fastener data according to a basic code, a subdivision code, a diameter code, and a brand. The fastener types mainly comprise bolts, screws, rivets, high-locking bolts, ring groove nails, cotter pins, nuts, high-locking nuts, nail sleeves, washers, fuses and tray nuts. The database has strong universality and is suitable for various industries. The fastener data is digitized and structured, the concept of a data warehouse is used, the data storage and retrieval efficiency is improved, and a uniform data source is provided for the fastener design. In addition, the data volume of the fasteners is large, and in order to improve the selection speed, a selection catalogue can be established in the database, namely, a user can only select the fasteners in the selection catalogue, so that the data display capacity is reduced, and the selection efficiency is greatly improved. In the preferred embodiment, the fastener database adopts an Oracle or SQlite database, the fasteners are divided into a first fastener, a second fastener and a third fastener, wherein the bolt, the high-locking bolt, the rivet, the screw and the annular groove rivet are used as the first fastener, four levels of database table association are adopted, the cotter pin and the fuse are used as the third fastener, the nut, the high-locking nut, the washer and the pallet nut are used as the second fastener, and the second fastener and the third fastener are all associated by the three levels of database, so that data redundancy is reduced in the database design, meanwhile, the storage space is saved, and the speed of increasing, deleting and modifying of the fastener data is accelerated.

At step 102, a fastener selection knowledge base is established, the fastener selection knowledge base comprises a second fastener matching rule matched with the first fastener, a third fastener rule of a third fastener matched with the first fastener and the second fastener is selected according to the information of the first fastener and the second fastener, and after the second fastener combined with the first fastener is determined according to the second fastener matching rule, a first fastener length check rule that the length of the first fastener can be matched with the connecting part is selected, wherein:

The fastener selects a knowledge base to provide common fastener combination definition and rapid assembly such as bolts, nuts and washers, and a designer can finish the assembly design of the fastener by selecting the classical matching combination of the fasteners in the design process, so that the design speed is accelerated.

In step 103, a model of the equipment to be used for fastener selection is created using a modeling tool, and fastener mounting points are generated on the model of the equipment. In the preferred embodiment, the CATIA software is integrated into the fastener selection process, and a model of the device to be selected for fasteners is established through the CATIA.

In step 104, a fastener mounting point of the equipment is selected in the established equipment model, and a connecting part corresponding to the mounting point is selected.

Preferably, the selecting a fastener mounting point of the equipment in a pre-established equipment model and selecting a connecting part corresponding to the mounting point comprises:

In the preferred embodiment, the fastener mounting point is generated by using a create point function in the CATIA, and the point may be on the connecting part or not on the surface of the connecting part, and the connecting part is selected by selecting the fastener mounting point singly or more through an interface catpatherementagent mechanism of the CAA and selecting the connecting part through the interface catpatherementagent mechanism of the CAA.

At step 105, a link part sandwich thickness is calculated from the fastener mounting points and the link part.

Preferably, said calculating a link part sandwich thickness from said fastener mounting points and link parts comprises:

In the preferred embodiment, the normal direction of the fastener is determined by calling the distances from the point to all the surfaces of the connecting part, which are obtained by the catreatetoppproject of the CAA interface, according to the mounting point of the fastener and the connecting part, comparing the distances, taking the surface with the minimum distance as the nearest surface, and calling the catreatetoppelinenortomahell to obtain the normal direction from the point to the surface. The interlayer thickness of the connecting part of the fastener is calculated according to the mounting point and the normal line, a line passing through the connecting part is obtained by using a CAA interface CATMethLine, the intersection point of the line and the connecting part is obtained by using a CAA interface CATRefateTopInterselect interface, the farthest point and the closest point which are far away from the mounting point of the fastener are obtained from the intersection point, and the interlayer thickness of the connecting part of the fastener is obtained through the farthest point and the closest point.

In step 106, a fastener database is called, and a first fastener type of the connecting part is selected from the generated first fastener type list, wherein the fastener database comprises fastener numbers and fastener information corresponding to the fastener numbers, and the fastener numbers comprise basic numbers, diameter numbers and brand numbers.

In the preferred embodiment, after the fastener database is called, the first fastener type is selected, and the first fastener type is one of a bolt, a high-lock bolt, a ring groove nail, a rivet, and a screw.

At step 107, a base code for a first fastener is arbitrarily selected from a list of base codes for first fasteners generated based on the selected first fastener type.

In the preferred embodiment, after the first fastener type is selected, because the attribute column in the basic code table in the fastener database has the fastener type, the database can automatically screen out all the fastener basic codes in the fastener basic code table according to the fastener type attribute, and display the basic codes of all the first fasteners under the selected fastener type attribute, and the user can select any one first fastener basic code as required.

At step 108, a first fastener diameter code is arbitrarily selected from a list of first fastener diameter codes generated from the selected first fastener base code.

In the preferred embodiment, after the basic code of the first fastener is selected, the attribute column in the diameter code table of the first fastener has a fastener subdivision code, and the subdivision code table corresponds to the basic code, so that the basic code corresponds to the diameter code, the database can automatically screen out all the selected diameter codes corresponding to the basic code of the first fastener according to the selected basic code of the first fastener, and a user can select the diameter code corresponding to any basic code of the first fastener as required.

In step 109, a second fastener grade is arbitrarily selected from a list of second fastener grades generated according to a first fastener nominal diameter corresponding to the selected first fastener diameter grade, wherein the selected second fastener meets a preset second fastener matching rule.

In step 110, when it is determined that a third fastener needs to be selected according to first fastener information corresponding to the selected first fastener diameter code and second fastener information corresponding to the selected second fastener grade, a third fastener grade is arbitrarily selected from a generated third fastener grade list, wherein the third fastener in the third fastener grade list meets a preset third fastener matching rule.

Preferably, when the first fastener is a bolt and the second fastener has a nut, if the diameter of the tail hole in the bolt diameter code table is greater than 0, the third fastener is a cotter pin, and the third fastener matching rule includes:

when the groove bottom thickness of nut tablet table equals 0, wherein:

In step 111, first fastener information corresponding to each first fastener grade in a first fastener grade list generated according to the nominal diameter corresponding to the selected first fastener diameter code, second fastener information corresponding to the selected second fastener grade, and the interlayer thickness of the connecting part, and first fastener grades meeting a first fastener length verification rule are selected from the first fastener grade list generated according to the nominal diameter corresponding to the selected first fastener diameter code.

Preferably, the first fastener matching rule includes:

The maximum clamping thickness is the thickness of the interlayer of the connecting part, the thickness of the head gasket, the thickness of the tail gasket and the thread clearance;

the minimum clamping thickness is the thickness of the interlayer of the connecting part, the thickness of the head gasket and the thickness of the tail gasket;

the minimum clamping thickness is equal to the thickness of an interlayer of the rivet connecting part, the thickness of a head gasket of the rivet, the thickness of a tail gasket of the rivet, the thickness of a tray nut and the thickness of a tail gasket of the first fastener;

At step 112, a combination is generated based on the selected first fastener grade, second fastener grade, and third fastener grade for an optimal fastener-style result for the device connection part.

FIG. 3 is a flow chart of a fastener selection in accordance with a preferred embodiment of the present invention. When the type of the first fastener is selected to be a bolt, as shown in fig. 3, the second fastener matched therewith may be a general nut and washer, or a pallet nut, a rivet and a washer. According to the nominal diameter corresponding to the diameter code of the selected bolt, firstly, a brand list of common nuts and tray nuts which are equal to the nominal diameter of the bolt is generated, the brand of one common nut or tray nut is selected randomly, when the common nut or tray nut is selected, a brand list of washers which are equal to or larger than the nominal diameter of the bolt is generated, and one or more washers are selected randomly as head washers or tail washers; and after the washer matched with the bolt is selected, determining the brand of the bolt according to the information of the selected bolt, the selected nut and the washer matched with the bolt and the matching rule of the first fastener. When the second fastener comprises the tray nut, besides determining the grade of the bolt, a rivet diameter code list equal to the nominal diameter of the rivet in the tray nut grade list is generated according to the corresponding rivet nominal diameter column in the tray nut grade list, one rivet diameter code is selected from the rivet diameter code list, then a gasket grade list matched with the rivet is generated according to the nominal diameter in the rivet diameter code list, and the nominal diameter of the gasket in the gasket grade list is equal to or larger than the nominal diameter of the rivet in the rivet diameter code list. And after the washer matched with the rivet is determined, determining the grade of the rivet according to the first fastener matching rule and the information of the rivet and the washer matched with the rivet. In addition, when the first fastener is a bolt, the second fastener is a common nut or a tray nut, if the diameter of a head hole in the selected bolt diameter number table is larger than 0, a fuse of a third fastener is selected, and the fuse matching rule is that the diameter of a fuse in the fuse brand number table is smaller than the diameter of the head hole in the bolt diameter number table; and if the diameter of the hole in the brand number table of the selected common nut is larger than 0, selecting a third fastener fuse, wherein the fuse matching rule is that the diameter of the fuse in the fuse brand number table is smaller than the diameter of the hole in the nut brand number table. And if the diameter of the tail hole in the selected bolt diameter code table is larger than 0, selecting a cotter pin of a third fastener, wherein the cotter pin matching rule is divided into two cases according to whether the thickness of the groove bottom in the selected diameter code table of the common nut matched with the bolt is 0 or not.

When the first fastener type is a screw, the second fastener has the same matching rules as the bolt, except that the screw does not need to match the third fastener cotter pin and fuse. Wherein the second fastener matched with the screw comprises a combination of a common nut and a washer or a combination of a tray nut, a rivet and a washer.

FIG. 4 is a flow chart of another fastener option in accordance with a preferred embodiment of the present invention. When the type of the first fastener is selected to be a high lock bolt, as shown in fig. 4, the second fastener matched therewith may be a normal nut and washer, or a high lock nut and washer. According to the nominal diameter corresponding to the diameter code of the selected high-locking bolt, firstly, a brand list of common nuts and high-locking nuts which are equal to the nominal diameter of the high-locking bolt is generated, the brand of one common nut or one high-locking nut is selected randomly, when the common nut or the high-locking nut is selected, a washer brand list which is equal to or larger than the nominal diameter of the high-locking bolt is generated, and one or more washers are selected randomly as head washers or tail washers; and after the washer matched with the high-lock bolt is selected, determining the brand of the high-lock bolt according to the first fastener matching rule according to the selected high-lock bolt, the selected nut and the information of the washer matched with the high-lock bolt. In addition, when the first fastening piece is a high-lock bolt and the second fastening piece is a common nut, if the diameter of a hole in the brand number table of the selected common nut is larger than 0, a fuse of a third fastening piece is selected, and the fuse matching rule is that the diameter of the fuse in the fuse brand number table is smaller than the diameter of the hole in the nut brand number table.

In the preferred embodiment, when the first fastening member is a ring groove nail or a rivet, the third fastening member does not need to be matched, wherein when the first fastening member is the ring groove nail, the second fastening member is a nail sleeve and a washer, when the first fastening member is the rivet, the second fastening member is the washer, the matching rule of the second fastening member is the same as that of the first fastening member which is a bolt without a head hole and a tail hole, and the common nut without a hole.

FIG. 5 is a schematic diagram of a fastener selection system according to a preferred embodiment of the present invention. As shown in fig. 5, the fastener selection system 500 according to the preferred embodiment includes:

database unit 501 for building a fastener database, wherein the database divides fasteners into first fasteners, second fasteners and third fasteners, establishes a four-level database table association for the first fasteners, establishes a three-level database table association for the second fasteners and the third fasteners, wherein the first-level form of the four-level database table manages the basic code information of the first fasteners, the basic code information includes the basic code of the first fasteners, the name, the fastener type, the head type and the unit system, the second-level form manages the subdivided code information of the first fasteners, the subdivided code information includes the subdivided code of the first fasteners, the basic code, the name, the material, the surface processing mode and the installation direction, the third-level form manages the diameter code information of the first fasteners, and the diameter code information includes the subdivided code of the first fasteners, the diameter code information, Nominal diameter, head size and hole information, wherein a fourth-level form manages first fastener grade information, and the grade information comprises a first fastener diameter code, grade, clamping thickness, total length and mounting position; the first-level form of the third-level database table manages basic code number data of a second fastener and a third fastener, the basic code number data comprises basic code numbers, names, fastener types, head types and unit systems of the second fastener and the third fastener, the second-level form manages subdivision code number data of the second fastener and the third fastener, the subdivision code number data comprises subdivision code numbers, basic code numbers, names, materials, surface processing modes and installation directions of the second fastener and the third fastener, the third-level form manages brand number data of the second fastener and the third fastener, and the brand number data comprises brand numbers, nominal diameters, outer diameters, hole information, lengths, thicknesses, groove information, thread gaps and installation positions of the second fastener and the third fastener; the first fastener is a fastener which is necessary to be provided in a fastener selection combination, the second fastener is a fastener which is matched with the first fastener to fasten the connecting part, and the third fastener is a fastener which is installed on the first fastener and the second fastener based on the special structures of the first fastener and the second fastener;

a knowledge base unit 502 for establishing a fastener selection knowledge base, the knowledge base unit including a first matching unit 521, a second matching unit 522 and a third matching unit 523, wherein:

the first matching unit 521 is used for selecting a second fastener matching the first fastener according to a second fastener matching rule, wherein:

the second matching unit 522 is configured to select a third fastener matching the first fastener and the second fastener according to a third fastener rule, wherein:

the third matching unit 523 is configured to select a first fastener having a length capable of matching the connection part according to the first fastener length verification rule after determining a second fastener to be combined with the first fastener according to the second fastener matching rule, where:

A model establishing unit 503 for establishing a model of the apparatus to be subjected to fastener selection using a modeling tool and generating a fastener mounting point on the model of the apparatus.

A first selection unit 504, configured to select a fastener installation point of the equipment in a pre-established equipment model, and select a connection part corresponding to the installation point;

a first calculation unit 505 for calculating a connecting part sandwich thickness from the fastener mounting point and the connecting part;

a second selecting unit 506, configured to invoke a pre-established fastener database, and select a first fastener type of the connecting part from the generated first fastener type list, where the fastener database includes fastener numbers and fastener information corresponding to the fastener numbers, and the fastener numbers include a basic number, a diameter number, and a brand number.

A third selection unit 507 for arbitrarily selecting a base code number of a first fastener in a first fastener base code number list generated according to the selected first fastener type.

A fourth selection unit 508 for arbitrarily selecting one first fastener diameter code in the first fastener diameter code list generated from the selected first fastener base code;

a fifth selecting unit 509, configured to arbitrarily select one second fastener grade from a list of second fastener grades generated according to the first fastener nominal diameter corresponding to the selected first fastener diameter code, where the selected second fastener satisfies a preset second fastener matching rule.

And a sixth selecting unit 510, configured to, when it is determined that a third fastener needs to be selected according to the first fastener information corresponding to the selected first fastener diameter code and the second fastener information corresponding to the selected second fastener grade, arbitrarily select a third fastener grade from the generated third fastener grade list, where a third fastener in the third fastener grade list meets a preset third fastener matching rule.

A seventh selecting unit 511, configured to select, according to the first fastener information corresponding to each first fastener grade in the first fastener grade list generated according to the nominal diameter corresponding to the selected first fastener diameter code, the second fastener information corresponding to the selected second fastener grade, and the interlayer thickness of the connecting part, the first fastener grade meeting the first fastener length verification rule from the first fastener grade list generated according to the nominal diameter corresponding to the selected first fastener diameter code.

A typing results unit 512 for generating a combination for the best fastener typing results for the device connecting part based on the selected first fastener grade, second fastener grade, and third fastener grade.

Preferably, when the first fastener in the second matching unit 522 is a bolt and the second fastener has a nut, if the diameter of the tail hole in the bolt diameter code table is greater than 0, the third fastener is a cotter pin, and the third fastener matching rule includes:

when the groove bottom thickness of nut tablet table equals 0, wherein:

Preferably, the first fastener matching rule of the third matching unit 523 includes:

Preferably, the first selecting unit 504 includes:

a mounting point selection unit 541 for selecting one or more mounting points to be fastener-mounted among fastener mounting points of the equipment model;

a connecting parts unit 542 for manually selecting connecting parts of the one or more mounting points according to the selected one or more mounting points, or automatically selecting connecting parts of the one or more mounting points according to matching rules of the set fastener mounting points and connecting parts.

Preferably, the first calculation unit 505 includes:

a plane determination unit 551 for calculating distances of the fastener mounting points to all the faces of the connecting parts from the selected fastener mounting points and connecting parts, and comparing the distances to determine a face having the smallest distance of the fastener mounting points to the connecting parts;

a normal direction determination unit 552, configured to obtain, according to the determined firmware mounting point to the plane with the smallest connection distance, a normal direction from the firmware mounting point to the plane with the smallest distance;

a first intersection unit 553 for finding an intersection of a line passing through the connection part and the connection part according to the firmware mounting point and the normal direction;

a second intersection unit 554 configured to calculate distances between the firmware installation point and the intersections, select a minimum distance and a maximum distance from the determined distances, and take an intersection corresponding to the minimum distance and the maximum distance as a closest point and a farthest point;

and the interlayer thickness unit 555 is used for calculating the distance between the closest point and the farthest point, wherein the distance is the interlayer thickness of the connecting part.

The steps of selecting the fastener by the fastener selecting system are the same as the steps adopted by the fastener selecting method, and the technical effect is also the same, so that the details are not repeated.

The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.

Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims

1. A method of fastener selection, the method comprising:

2. The method of claim 1, wherein the method further comprises, prior to selecting a fastener mounting point for the equipment in a pre-established model of the equipment, and selecting a connecting part corresponding to the mounting point:

establishing a fastener selection knowledge base, wherein the fastener selection knowledge base comprises a second fastener matching rule matched with a first fastener, selecting a third fastener matching rule of a third fastener matched with the first fastener and the second fastener according to the information of the first fastener and the second fastener, and selecting a first fastener length verification rule that the length of the first fastener can be matched with the length of a connecting part after determining the second fastener combined with the first fastener according to the second fastener matching rule, wherein:

3. The method of claim 2, wherein when the first fastener is a bolt and the second fastener has a nut, and the third fastener is a cotter pin if the tail hole diameter in the bolt diameter code is greater than 0, the third fastener matching rule comprises:

when the groove bottom thickness of nut tablet table equals 0, wherein:

4. The method of claim 2, wherein the first fastener matching rule comprises:

5. The method of claim 1, wherein selecting fastener mounting points for the equipment in a pre-established model of the equipment, and selecting corresponding connection features for the mounting points comprises:

6. The method of claim 1, wherein calculating a link part sandwich thickness from the fastener installation points and link parts comprises:

7. A fastener selection system, the system comprising:

a sizing result unit for generating a combination based on the selected first fastener grade, second fastener grade, and third fastener grade for an optimal fastener sizing result for the equipment connecting part.

8. The system of claim 7, further comprising:

9. The system of claim 8, wherein the first fastener in the second matching unit is a bolt, and when the second fastener has a nut, if the tail hole diameter in the bolt diameter code table is greater than 0, the third fastener is a cotter pin, and the third fastener matching rule comprises:

when the groove bottom thickness of nut tablet table equals 0, wherein:

10. The system of claim 8, wherein the first fastener matching rule of the third matching unit comprises:

calculating a first fastener to be selected, wherein the calculation formula is as follows:

11. The system of claim 7, wherein the first selection unit comprises:

12. The system of claim 7, wherein the first computing unit comprises: