A laboratory fiber twisting device and method

Abstract

The application discloses a fiber twisting device and a twisting method for experiments, and belongs to the technical field of fiber twisting devices.The fiber twisting device comprises two parallel supporting seats, two mounting sleeves are arranged on the two supporting seats, and the opposite surfaces of the two mounting sleeves are both open; a solvent cabin with closed two ends is arranged between the two mounting sleeves, and the two ends of the solvent cabin are respectively provided with a first twisting disc and a second twisting disc; a window is formed in the upper end of the solvent cabin, the window is encapsulated through a transparent cabin cover, the first twisting disc is mounted on a rotating shaft, the second twisting disc is mounted on one end of a lead screw, the lead screw extends to the axial direction of the solvent cabin through the other end of the solvent cabin, the lead screw is threadedly connected with the other end of the solvent cabin, a hand wheel is arranged at the other end of the lead screw, and a plurality of fixing holes for fixing fibers are arranged on the second twisting disc and the first twisting disc.The twisting method comprises steps S1-S8.The twisting mode of the fiber twisting device is more controllable, the fiber twisting device can be suitable for twisting fibers with different lengths, theory is combined with practice, and the experimental precision and the development are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fiber twisting experimental research, in particular to an experimental fiber twisting device and a twisting method. BACKGROUND

[0002] Currently, in the field of biomedical science, many biological sutures are needed to be applied to achieve the purpose of leaving no scar at the wound site after surgery and having no adverse effects on the body. However, the biological sutures are limited by the material properties, and it is required to cause no harm to the human body while taking into account the requirements of toughness, fineness and strength. Therefore, a twisting device needs to be used to test the toughness, ductility and strength of the material. The traditional industrial twisting device and twisting method cannot form a solvent environment, and the traditional twisting machine cannot be hand-operated and is not convenient for experimental personnel to manually adjust. At present, there is no laboratory instrument specially used for material twisting in a twisting solvent, and the twisting effect cannot be observed in real time. SUMMARY

[0003] In view of the above deficiencies in the prior art, the present application provides an experimental fiber twisting device and a twisting method which meet the laboratory twisting requirements and have high twisting precision.

[0004] In order to achieve the above-mentioned purposes, the technical scheme adopted by the present application is as follows:

[0005] The experimental fiber twisting device comprises two parallel support seats, two mounting sleeves are arranged on the two support seats, and the opposite faces of the two mounting sleeves are open; a solvent tank with closed two ends is arranged between the two mounting sleeves, the solvent tank has a cylindrical structure, first and second twisting discs are arranged at the two ends of the solvent tank and are rotatably arranged in the solvent tank; a window is formed in the upper end of the solvent tank, the window is encapsulated by a transparent tank cover, the first twisting disc is mounted on a rotating shaft, the rotating shaft passes through one end of the solvent tank and is connected with the rotating shaft of a stepping motor through a shaft coupling, the second twisting disc is mounted on one end of a lead screw, the lead screw extends axially towards the solvent tank through the other end of the solvent tank and is threadedly connected with the other end of the solvent tank, a hand wheel is arranged at the other end of the lead screw, and a plurality of fixing holes for fixing fibers are arranged on the first and second twisting discs.

[0006] Further, the upper end of the tank cover is provided with a charging port, and the lower end of the solvent tank is provided with a discharging port, the charging port and the discharging port are respectively encapsulated by a charging cover and a discharging cover, and the charging port and the charging cover and the discharging port and the discharging cover are threadedly connected.

[0007] Furthermore, a second groove in the shape of a cross is formed on the surface of the second twisting disc near the surface of the first twisting disc. The second groove extends to the circumference of the second twisting disc, and a second thread routing groove is provided at the bottom of the second groove. A slider is movably arranged in the second groove. The size of the slider is larger than the size of the second thread routing groove. A through hole perpendicular to the surface of the second twisting disc is formed on the slider. The position of the through hole corresponds to the position of the second groove. Furthermore, the mounting sleeve and the solvent chamber are provided with thread inlet holes corresponding to the second thread routing groove.

[0008] Furthermore, a fixing block is provided in the middle of the second twisting disc, and a second fixing hole for fixing fibers is provided on the fixing block.

[0009] Furthermore, a first groove in the shape of a cross is formed on the surface of the first twisting disc near the second twisting disc, and a number of first fixing holes for fixing fibers are evenly arranged at the bottom of the first groove.

[0010] Furthermore, both the edge of the hatch and the edge of the window are provided with fixing lugs. The hatch is fixed to the window by bolts on the fixing lugs, and both the edge of the hatch and the window are provided with sealing strips. A handle is provided at the top of the hatch.

[0011] A twisting method using the aforementioned experimental fiber twisting device is provided, comprising the following steps:

[0012] S1: Extract fibers from the twisting raw material that can be used for twisting. n root, n ≥10, and the diameter of each fiber was measured. d and the ultimate tensile force that can be withstood f Collect the ultimate tensile strength of each fiber. f elongation under the condition : ,in L To withstand the ultimate tensile force f The length of the fracture at that time L 0 represents the initial length of the fiber;

[0013] Obtain a data set for each fiber, each data set including [( f ).( d , )];

[0014] Establish the ultimate tensile strength that the fiber can withstand. f With diameter d、 elongation Relational model: ,in a The influence coefficient of diameter on ultimate tensile force. b The influence coefficient of elongation on ultimate tensile force. c This is the volatility coefficient;

[0015] Willn Root fiber obtained n Each data group is queued, and every three data groups [( f ). ( d , )] form a calculation relationship data group, which is substituted into the relationship model to calculate the coefficients a , b and c Each calculation relationship data group obtains a coefficient data group ( a , b , c );

[0016] According to the number of data groups n , obtain m coefficient data groups, , q is the number of data groups that cannot form a calculation relationship data group;

[0017] The average values of the coefficients m , a and b in the c calculated coefficient data groups are:

[0018] , ,

[0019] Among them, a i , b i and c i are the impact coefficient and fluctuation coefficient calculated from the i th coefficient data group;

[0020] Substitute the average values , and into the relationship model to obtain the evaluation model of the limit tensile force f that the fiber can withstand: ;

[0021] S2: Select the twisted fiber that needs to be twisted, and substitute the elongation and diameter d of the twisted fiber into the evaluation model to calculate the limit tensile force that each twisted fiber can withstand, and calculate the total tensile force that the twisted fiber can withstand F 1= f 1 +f 2+···+ f e , e is the number of twisted fibers required for this twisting.

[0022] S3: open the hatch, and e the root twisted fibers are respectively threaded from the threading holes, the twisted fibers are threaded through the second threading groove, and are threaded out from the through holes on the sliders;

[0023] S4: the twisted fibers respectively threaded out from the through holes on each slider are pulled, so that the two ends of the twisted fibers are respectively fixed on the first fixed hole of the first twisting disc and the second fixed hole of the second twisting disc;

[0024] S5: cover the hatch, fix the hatch on the window through the bolts, open the feeding cover and seal the discharging port by the discharging cover; fill the twisted solvent into the solvent tank through the feeding port, and tightly cover the feeding cover;

[0025] S6: the stepping motor rotates at the set speed v , and the hand wheel is kept stationary; the twisted fibers are input into the solvent tank from the threading holes during the twisting process, and after the preliminary twisting is completed, the stepping motor stops rotating;

[0026] S7: drive the hand wheel to rotate the second twisting disc, so that the second twisting disc moves along the axis of the solvent tank in the solvent tank, and stretch the biologic suture whose preliminary twisting is completed; after the biologic suture is stretched to the set length l , stop rotating the hand wheel, and the biologic suture is twisted;

[0027] S8: open the discharging cover to discharge the remaining twisted solvent for recycling, then open the hatch to take out the twisted biologic suture, and test the performance of the biologic suture, including the following steps:

[0028] S81: remove the un-tightened edges of the taken-out biologic suture, and test the diameter D and the limit tensile force F 2 that the biologic suture can bear;

[0029] S82: subtract the limit tensile force F 2 from the total tensile force F 1 to obtain the improvement value of the limit tensile force that the root fibers can bear after twisting e : ;

[0030] If , it is determined that the speed of the stepping motor v is too high, the fiber is excessively twisted during the twisting process, and part of the fiber has been broken during the twisting process; or the length of the second twisting disc l is too large, and part of the fiber has been broken during the stretching process; the speed of the stepping motor v and the length of the second twisting disc l need to be adjusted; ​

[0031] If , the lifting value is compared with the lifting threshold ;

[0032] If , it is determined that the twisted biological suture meets the requirements;

[0033] If , it is determined that the twisted biological suture does not meet the requirements, and the diameter D is compared with the standard diameter D of the twisted biological suture; 标准

[0034] If D ≥ D 标准 , the fiber material for twisting needs to be replaced, and a fiber material with a higher ultimate tensile strength f is used for twisting;

[0035] If D < D 标准 , the number of twisted fibers needs to be increased, and the difference between the lifting value and the lifting threshold F 差值 = - , e the average ultimate tensile strength of the twisted fibers is: ;

[0036] The number of twisted fibers that needs to be increased is calculated using the difference F 差值 and the average ultimate tensile strength : M

[0037]

[0038] where S is a positive integer, s and the remainder is less than the average ultimate tensile strength .

[0039] ​The beneficial effects of the present application are that the twisting device adopts a full-cabin closed structure, which can make the material completely soaked in the twisting solvent to complete the twisting work, and the specific solution can be recycled, saving experimental materials; the truncated cabin design makes it more convenient for the operator to clamp the twisted material; the scheme can realize "manual and automatic integration", which can twist through the control of the stepping motor, save manpower in the automatic process, and control the twisting speed more accurately through the control of the stepping motor, and can also rotate the lead screw manually, so that the twisting form is more controllable.

[0040] The solvent cabin and the cabin cover of the device can use acrylic material as the main body, which has corrosion resistance and good transparency, making it more convenient for the operator to observe the test results. The design of the slider on the second twisting disc makes the whole device applicable to more experimental materials. The slider can be designed as five, one center slider and four edge sliders. The edge slider position can be adjusted and fixed, which can be applied to different fiber twisting of different counts and angles. The manual twisting disc can be moved horizontally in the cabin by rotating the lead screw, which can be applied to different lengths of fiber twisting and stretching.

[0041] The twisting method fully considers the influence of the performance of the biological suture from the raw material to the formation process of the biological suture, and adjusts and controls the twisting process from the raw material angle, the control parameters of the twisting device and other aspects, so as to ensure that each parameter can be accurately adjusted and controlled in the experiment, and the biological suture meeting the requirements can be obtained. And the performance of the biological suture formed by twisting can be inversely adjusted and controlled by the parameters, the number and the control parameters of the twisting device of the fiber raw material. The accuracy of the biological suture obtained by each experiment can be improved, and the established evaluation model can better screen the fiber raw material. The theory and practice are combined to improve the experimental accuracy and developability. BRIEF DESCRIPTION OF DRAWINGS

[0042] Fig. 1 It is a sectional view of the experimental fiber twisting device.

[0043] Fig. 2 It is a structure diagram of the second twisting disc.

[0044] Fig. 3 It is a structure diagram of the first twisting disc.

[0045] Wherein, 1, stepper motor, 2, motor support, 3, first twisting disc, 4, support seat, 5, discharge port, 6, discharge cover, 7, solvent cabin, 8, second twisting disc, 9, screw rod, 10, hand wheel, 11, mounting sleeve, 12, cabin cover, 13, fixing lug, 14, handle, 15, feeding port, 16, feeding cover, 17, second fixing hole, 18, second sink groove, 19, second wire groove, 20, first fixing hole, 21, through hole, 22, fixing block, 23, first sink groove. DETAILED DESCRIPTION

[0046] The specific embodiments of the present application are described below to facilitate the understanding of the present application for those skilled in the art, but it should be clear that the present application is not limited to the scope of the specific embodiments, and for those skilled in the art, as long as various changes are within the spirit and scope of the present application defined and determined by the appended claims, all the inventions utilizing the concept of the present application are within the scope of protection.

[0047] As Figs. 1-3 shown, the experimental fiber twisting device of the present scheme includes two parallel support seats 4, two support seats 4 are provided with mounting sleeves 11, and the opposite faces of the two mounting sleeves 11 are open; two ends of the solvent cabin 7 are closed, the solvent cabin 7 is a cylindrical structure, the two ends of the solvent cabin 7 are respectively provided with the first twisting disc 3 and the second twisting disc 8, and the first twisting disc 3 and the second twisting disc 8 are rotationally arranged in the solvent cabin 7; a window is formed in the upper end of the solvent cabin 7, the window is encapsulated by the transparent cabin cover 12, the first twisting disc 3 is installed on the rotating shaft, the rotating shaft passes through one end of the solvent cabin 7 and is connected with the rotating shaft of the stepper motor 1 through the coupling, the stepper motor 1 is installed on the mounting sleeve 11 through the motor support 2, the second twisting disc 8 is installed on one end of the screw rod 9, the screw rod 9 extends to the axial direction of the solvent cabin 7 through the other end of the solvent cabin 7, and the screw rod 9 is threadedly connected with the other end of the solvent cabin 7, the other end of the screw rod 9 is provided with the hand wheel 10, and a plurality of fixing holes for fixing fibers are arranged on the second twisting disc 8 and the first twisting disc 3.

[0048] The upper end of the cabin cover 12 is provided with the feeding port 15, and the lower end of the solvent cabin 7 is provided with the discharge port 5, the feeding port 15 and the discharge port 5 are respectively encapsulated by the feeding cover 16 and the discharge cover 6, and the feeding port 15 and the feeding cover 16, the discharge port 5 and the discharge cover 6 are threadedly connected.

[0049] The surface of the second twisting disc 8 close to the first twisting disc 3 is provided with a second groove 18 in the shape of a cross, the second groove 18 extends to the circumferential surface of the second twisting disc 8, and the bottom of the second groove 18 is provided with a second wire groove 19, a sliding block is movably arranged in the second groove 18, the size of the sliding block is larger than the size of the second wire groove 19, a through hole 21 perpendicular to the surface of the second twisting disc 8 is formed in the sliding block, the position of the through hole 21 corresponds to the position of the second groove 18, and the mounting sleeve 11 and the solvent cabin 7 are provided with wire holes corresponding to the second wire groove 19. The middle part of the second twisting disc 8 is provided with a fixed block 22, and the fixed block 22 is provided with a second fixing hole 17 for fixing fibers.

[0050] The surface of the first twisting disc 3 close to the second twisting disc 8 is provided with a first groove 23 in the shape of a cross, and the bottom of the first groove 23 is uniformly provided with a plurality of first fixing holes 20 for fixing fibers. The edges of the cabin cover 12 and the edges of the window are provided with fixed ears 13, the cabin cover 12 is fixed on the window through the bolts on the fixed ears 13, and the edges of the cabin cover 12 and the window are provided with sealing strips, and the upper end of the cabin cover 12 is provided with a handle 14.

[0051] The twisting device adopts a full-cabin closed structure, so that the material can be completely soaked in the twisting solvent to complete the twisting work; and the specific solution can be recycled, saving experimental materials; the truncated cabin design makes it more convenient for the operator to clamp the twisted material; the scheme can realize "hands-free", which can twist through the control of the stepping motor 1, save manpower in the automatic process, and control the twisting speed more accurately through the control of the stepping motor 1, and can also rotate the lead screw 9 manually, so that the twisting form is more controllable;

[0052] The solvent cabin 7 and the cabin cover 12 of the device can use acrylic material as the main body, which has corrosion resistance and good transparency, so that the operator can observe the test results more conveniently. The sliding block on the second twisting disc 8 can make the whole device applicable to more experimental materials, the sliding block can be designed as five, one center sliding block and four edge sliding blocks, the positions of the edge sliding blocks can be adjusted and fixed, and the device can be applicable to fibers of different counts and different angles for twisting; the manual twisting disc can be horizontally moved in the cabin body by rotating the lead screw 9, and can be applicable to fibers of different lengths for twisting and stretching.

[0053] The twisting method of the above-mentioned experimental fiber twisting device comprises the following steps:

[0054] S1: extracting fibers that can be used for twisting from twisting raw materials n , n ≥10, and detecting the diameter d and the limit tensile force f of each fiber fthe elongation in the case of tensile stress : wherein L is the length at which the fiber breaks when subjected to the ultimate tensile stress f , L 0 is the initial length of the fiber;

[0055] a data set is obtained for each fiber, each data set comprising [( f ). ( d , )] ;

[0056] a model is established for the relationship between the ultimate tensile stress that a fiber can withstand and the diameter f and the elongation d、 : wherein is the influence coefficient of the diameter on the ultimate tensile stress, a is the influence coefficient of the elongation on the ultimate tensile stress, b is a fluctuation coefficient; c

[0057] the n data sets obtained for the n fibers are grouped, and every three data sets [( f ). ( d , )] form a calculation relationship data set, which is substituted into the relationship model to calculate the coefficients a , b and c , and each calculation relationship data set obtains a coefficient data set ( a , b , c ) ;

[0058] according to the number of data sets n , there are m coefficient data sets, , q is the number of data sets that cannot form a calculation relationship data set;

[0059] the average values of the coefficients m , a and b in the c coefficient data sets calculated are:

[0060] , ,

[0061] wherein, a i , b i and c ​i respectively are the impact coefficient and fluctuation coefficient calculated by the first i and the second coefficient data group respectively;

[0062] substitute the average value , and into the relational model, to obtain the evaluation model of the limit tension that the fiber can bear: f ;

[0063] S2: select the twisting fiber that needs to be twisted, substitute the elongation rate and diameter d of the twisting fiber into the evaluation model, calculate the limit tension that each twisting fiber can bear, and calculate the total tension that the twisting fiber can bear F 1= f 1 +f 2+···+ f e , e the number of twisting fibers required for this twisting;

[0064] S3: open the hatch 12, pass e twisting fibers through the entry hole respectively, and make the twisting fibers pass through the second wiring slot 19 and pass out from the through hole 21 on the slider;

[0065] S4: pull the twisting fibers that pass out from the through hole 21 on each slider respectively, so that the two ends of the twisting fiber are fixed on the first fixed hole 20 of the first twist disc 3 and the second fixed hole 17 of the second twist disc 8 respectively;

[0066] S5: cover the hatch 12, fix the hatch 12 on the window through bolts, open the feeding cover 16 and seal the discharge port 5 with the discharge cover 6; fill the twisting solvent into the solvent cabin 7 through the feeding port 15, and tightly cover the feeding cover 16;

[0067] S6: the step motor 1 rotates at a set speed v , and the hand wheel 10 remains stationary, the twisting fiber is input into the solvent cabin 7 from the entry hole during the twisting process, and the step motor 1 stops rotating after the preliminary twisting is completed;

[0068] S7: drive the hand wheel 10 to rotate the second twist disc 8, so that the second twist disc 8 moves along the axis of the solvent cabin 7 in the solvent cabin 7, and stretch the biological suture that has completed the preliminary twisting, and stop rotating the hand wheel 10 after the biological suture is stretched to a set length l , and the biological suture is twisted;

[0069] ​S8: Open the discharge cover 6 to discharge the remaining twisting solvent for recycling, then open the hatch cover 12 to take out the twisted biological suture, and test the performance of the biological suture, including the following steps:

[0070] S81: Remove any loose edges from both sides of the extracted biological suture and test the diameter of the biological suture. D and the maximum tensile force that it can withstand. F 2;

[0071] S82: Ultimate tensile force F 2 and total tension F 1. Subtract the difference to get e The increase in the ultimate tensile strength that the root fiber can withstand after twisting : ;

[0072] like Then determine the speed of stepper motor 1. v Excessive twisting during the twisting process leads to excessive fiber twisting and breakage of some fibers; or the stretching length of the second twisting disc 8 is too high. l The speed was too high, and some fibers broke during the stretching process; the speed of stepper motor 1 needs to be adjusted. v The length of the second twisting disc 8 stretch l ;

[0073] like The value will be increased. With increasing the threshold Compare;

[0074] like If so, the twisted biological suture is deemed to meet the requirements;

[0075] like If the twisted biological suture does not meet the requirements, the diameter will be adjusted. D The standard diameter of the twisted biological suture D 标准 Compare;

[0076] like D ≥ D 标准 If so, the fiber material used for twisting needs to be replaced with one that has a higher ultimate tensile strength. f Twisting of fiber materials;

[0077] like D < D 标准 Then it is necessary to increase the number of twisted fibers and calculate the increase value. With increasing the threshold The difference F差值 = - , e Average ultimate tensile force of the root twisted fiber is: ;

[0078] The required increase in the number of twisted fibers is calculated using the difference F 差值 and the average ultimate tensile force M :

[0079]

[0080] wherein S is a positive integer, s is the remainder less than the average ultimate tensile force .

[0081] The twisting method of the present application fully considers the influence on the performance of the biological suture from the raw material of the fiber to the process of forming the biological suture, and adjusts and controls the twisting process from the raw material, the control parameters of the twisting device and other aspects, so as to ensure that each parameter can be accurately adjusted and controlled during the experiment, and to ensure that the required biological suture can be obtained. The performance of the biological suture formed by twisting reversely adjusts and controls the parameters of the fiber raw material, the number and the control parameters of the twisting device, and the precision of the biological suture obtained by each experiment is improved, the established evaluation model can better screen the fiber raw material, and the theory and the practice are combined to improve the experimental precision and the developability.

[0082] The above shows and describes the basic principles and main features of the present application and the advantages of the present application, and it is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be considered as limiting the claims involved.

[0083] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments which can be understood by those skilled in the art.​

Claims

1. A laboratory fiber twisting device characterized by, The utility model provides a kind of solvent tank for twisting biological suture, including two parallel support seats, two described support seat are provided with mounting sleeve, two described mounting sleeve opposite face are opened;Two described mounting sleeve between are provided with two ends closed solvent tank, the solvent tank is cylindrical structure, the two ends of the solvent tank are provided with first twist disc and second twist disc respectively, and first twist disc and second twist disc rotationally arranged in solvent tank;The upper end of the solvent tank is provided with window, the window is encapsulated by transparent hatch cover, the first twist disc is installed on rotating shaft, the rotating shaft passes one end of solvent tank and is connected with the rotating shaft of stepping motor by coupling, the second twist disc is installed on one end of screw rod, the screw rod extends to the axial direction of solvent tank by passing the other end of solvent tank, and the screw rod is threadedly connected with the other end of solvent tank, the other end of the screw rod is provided with hand wheel, the second twist disc and the first twist disc are provided with a plurality of fixed holes for fixing fibers on them; The upper end of the hatch cover is provided with a charging port, and the lower end of the solvent tank is provided with a discharge port. The surface of the second twist disc close to the first twist disc is provided with a second groove in the shape of a cross, the second groove extends to the circumferential surface of the second twist disc, and the bottom of the second groove is provided with a second wire slot, a sliding block is movably arranged in the second groove, the size of the sliding block is larger than the size of the second wire slot, a through hole perpendicular to the surface of the second twist disc is formed in the sliding block, the position of the through hole corresponds to the position of the second groove, and the mounting sleeve and the solvent tank are provided with a wire inlet hole corresponding to the second wire slot. The middle part of the second twist disc is provided with a fixed block, and a second fixed hole for fixing fibers is formed in the fixed block. The surface of the first twist disc close to the second twist disc is provided with a first groove in the shape of a cross, and a plurality of first fixed holes for fixing fibers are uniformly arranged in the bottom of the first groove.

2. The laboratory fiber twist device of claim 1, wherein The edges of the hatch cover and the window are provided with fixed ears, the hatch cover is fixed on the window by bolts on the fixed ears, and the edges of the hatch cover and the window are provided with sealing strips.

3. A twisting method for the experimental fiber twisting device according to any one of claims 1 to 2, characterized in that, The utility model provides a kind of solvent tank for twisting biological suture, including the following steps: S1: Extract fibers from the twisting raw material that can be used for twisting. n root, n ≥10, and the diameter of each fiber was measured. d and the ultimate tensile force that can be withstood f Collect the ultimate tensile strength of each fiber. f elongation under the condition : ,in L To withstand the ultimate tensile force f The length of the fracture at that time L 0 represents the initial length of the fiber; A data set is obtained for each fiber, each data set comprising [( f ).( d , )] establishing the limit tension that the fiber can withstand f with the diameter d、 tensile ratio relationship model: wherein a is the influence coefficient of the diameter on the limit tension, b is the influence coefficient of the tensile ratio on the limit tension, c is the fluctuation coefficient; Will n Root fibers obtained n Each data group is grouped into teams, and every three data groups [( f ).( d , This data is used to form a relational data set, which is then substituted into the relational model to calculate the coefficients. a , b and c Each set of computational relational data yields a set of coefficient data ( a , b , c ); According to the number of data sets n , obtain m data sets of coefficients, , q is the number of data sets that cannot form a data set of calculation relations The calculated m average of the coefficients a , b and c in the coefficient data set ， ， wherein, a i , b i and c i are the influence coefficient and the fluctuation coefficient respectively calculated from the first i coefficient data group. The average value , and is substituted into the relationship model to obtain an evaluation model of the limit tension that the fiber can withstand f : ; S2: selecting twisted fibers that need to be twisted, calculating the tensile strength of each twisted fiber and diameter d Substituting into the evaluation model, the limit tensile force that each twisted fiber can withstand is calculated, and the total tensile force that the twisted fiber can withstand is calculated F 1= f 1 +f 2+···+ f e , e The number of twisted fibers required for this twisting; S3: open the hatch, and e The twisted fibers are respectively threaded from the threading holes, the twisted fibers are threaded through the second threading groove, and the twisted fibers are threaded out from the through holes on the sliding block. S4: pulling the twisted fiber respectively from the through hole on each sliding block, and fixing the two ends of the twisted fiber on the first fixed hole of the first twist disc and the second fixed hole of the second twist disc respectively; S5: cover the hatch cover, fix the hatch cover on the window by bolts, open the charging cover and seal the discharge port with the discharge cover; fill the twisting solvent in the solvent tank through the charging port, and tightly cover the charging cover; S6: the stepper motor rotates at a set speed v rotates, and the hand wheel is kept stationary. The twisted fiber is input into the solvent cabin from the inlet hole during the twisting process. After the initial twisting is completed, the stepper motor stops rotating. S7: drive the hand wheel to rotate the second twisting disc, so that the second twisting disc moves along the solvent cabin axis in the solvent cabin, and the biologic suture with primary twisting completed is stretched to a set length l After that, stop rotating the hand wheel, and the biologic suture with twisting completed is obtained. S8: open the discharge cover to discharge the remaining twisting solvent for recycling, then open the hatch cover to take out the twisted biological suture, and test the performance of the biological suture, including the following steps: S81: removing the loose edges of the extracted biological suture, testing the diameter of the biological suture D and the limit tensile force that can be withstood F 2; S82: the limit tension F 2 the total tension F 1 difference, to obtain e the root fiber after twisting can withstand the limit of the tension of the value of the promotion : ; If , it is determined that the rotation speed of the stepping motor is too high, the twist of the fiber is too much in the twisting process, and part of the fiber has been broken in the twisting process; or the length of the second twist disc stretch is too large, and part of the fiber has been broken in the stretching process; it is necessary to adjust the rotation speed of the stepping motor v l v l ;​​​ If then the boost value is compared to a boost threshold ; If then the twisted bio-sutures are determined to meet the requirements; If , it is determined that the twisted biological suture does not meet the requirements, and the diameter D of the twisted biological suture is compared with the standard diameter D of the twisted biological suture 标准 ; If D ≥ D 标准 then the fiber material used for twisting needs to be replaced by a fiber material having a higher ultimate tensile force f for twisting. If D < D 标准 , the number of twisted fibers needs to be increased, and the lift value is calculated from the difference between the lift threshold F 差值 = - , e The average ultimate tensile strength of the twisted fibers is: ;​​ Utilizing the difference F 差值 and the average ultimate tensile force Calculating the required increase in the number of twisted fibers M : where S is a positive integer, s is the remainder less than the average ultimate tensile force .

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