CN111020863A - Closed knotless net braiding equipment and method - Google Patents
Closed knotless net braiding equipment and method Download PDFInfo
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- CN111020863A CN111020863A CN201911134224.0A CN201911134224A CN111020863A CN 111020863 A CN111020863 A CN 111020863A CN 201911134224 A CN201911134224 A CN 201911134224A CN 111020863 A CN111020863 A CN 111020863A
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04C—BRAIDING OR MANUFACTURE OF LACE, INCLUDING BOBBIN-NET OR CARBONISED LACE; BRAIDING MACHINES; BRAID; LACE
- D04C3/00—Braiding or lacing machines
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04C—BRAIDING OR MANUFACTURE OF LACE, INCLUDING BOBBIN-NET OR CARBONISED LACE; BRAIDING MACHINES; BRAID; LACE
- D04C3/00—Braiding or lacing machines
- D04C3/48—Auxiliary devices
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- Textile Engineering (AREA)
- Braiding, Manufacturing Of Bobbin-Net Or Lace, And Manufacturing Of Nets By Knotting (AREA)
Abstract
The invention relates to closed knotless net braiding equipment and a method, wherein a closed type braiding machine with a cylindrical surface or a spherical surface braiding chassis is used for braiding long spindles with taper sleeves, the spindle paths of n/2 odd drive plates and n/2 even drive plates are snakes connected end to end, the moving directions are opposite, and n-time nodes are braided into a moving cycle. The closed type braiding machine consists of a frame, a cylindrical surface or spherical surface braiding chassis, a braiding ring support, a spindle with a taper sleeve length, a driving plate driving component, a steering block and a steering block driving component. All the turning blocks are non-crossed spindle tracks, and the long spindle twisting and cataloguing pins with taper sleeves are arranged to the required length; the turning blocks between the two driving plates of the exchange spindle are crossed spindle tracks, the other turning blocks are still non-crossed spindle tracks, long spindles with taper sleeves are twisted into knots, and the positions of the knots are changed alternately. And circulating the steps, and performing braiding to seal the knotless net. The mesh-free braiding of the on-line eye-changing pins is realized.
Description
Technical Field
The invention belongs to the field of rope net technology and equipment, and relates to knotless net (especially closed knotless net) twisting equipment and a twisting method adopting the equipment.
Background
The vast majority of those used in the market are knotted and warp knitted knotless nets. The knotted net is knotted, and the protrusions are easy to wear, so that the net is easy to be partially damaged; the knotting motion in weaving causes great damage to the yarns, the stress at the knots is concentrated, and the strength of the net is reduced. The yarns at the interweaving part of the warp-knitted knotless net are subjected to shearing force, and the strength of the net is low. Due to the equipment structure, both the knotted net and the warp-knitted knotless net are net sheets.
A conventional knitting machine is used as a knitting unit, tens of hundreds of conventional knitting machines are combined together and then turned into a block to form a linear or square integral or modular device, and a knotless net piece or a closed knotless net is knitted. The mesh foot of the weaving knotless net is woven by 4 strands, and the nodes are woven by 8 strands, so that although the net is high in strength, the equipment occupies a large area, the material consumption is high, and the small mesh foot knotless net cannot be woven.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the knotted net and the nodes are easy to wear, the stress at the nodes is concentrated, the warp knitting knotless net has low strength, both can not weave closed nets, the consumption of knitting knotless net materials is large, the occupied area of equipment is large, and small eyes can not be knitted.
In order to solve the technical problem, the technical scheme of the invention is to provide a closed knotless net braiding device which is characterized by comprising a braiding chassis with a cylindrical surface or a spherical surface and a long spindle with a taper sleeve; the twisting base plate is arranged on the rack and is coaxially arranged with the twisting ring arranged on the twisting ring bracket; the n drive plates driven by the drive plate driving part are arranged on the inner surface of the stranded chassis; the inner surface of the twisting and weaving chassis is provided with groove-shaped fixed spindle tracks which are distributed along the axial direction and the circumferential direction and correspond to the n drive plates, and n is a positive even number; steering block mounting holes are formed between the axially adjacent groove-shaped fixed spindle rails, steering block mounting holes are formed between the groove-shaped fixed spindle rails circumferentially adjacent to the uppermost ring and the lowermost ring at intervals, and the steering blocks are mounted in the steering block mounting holes and driven by a steering block driving component; the turning block is provided with a groove-shaped variable spindle track, when the groove-shaped variable spindle track is in a position state I, the adjacent groove-shaped fixed spindle tracks are crossed through the groove-shaped variable spindle track, when the groove-shaped variable spindle track is in a position state II, the adjacent groove-shaped fixed spindle tracks are not crossed at the groove-shaped variable spindle track, and the groove-shaped fixed spindle track and the groove-shaped variable spindle track form a spindle track together; one end of the long spindle with the taper sleeve is a mounting end, and the other end of the long spindle is a yarn outlet; the mounting ends of 2n long spindles with taper sleeves are arranged in notches of the n driving plates and spindle tracks, and the two long spindles with taper sleeves correspond to one driving plate; the yarn outlets of 2n long spindles with taper sleeves are converged and infinitely close to the outside of the twisting ring; the n/2 odd drive plates and the n/2 even drive plates respectively drive the corresponding long spindles with taper sleeves to move in the spindle tracks from the initial positions, the spindle paths of the n/2 odd drive plates and the n/2 even drive plates are all closed snakes connected end to end and have opposite moving directions, n-time nodes are twisted to form a moving cycle, and the long spindles with taper sleeves return to the initial positions again.
Preferably, the long spindle with the taper sleeve consists of a base part, a bobbin part and a taper sleeve part, wherein the taper sleeve part is fixedly connected on the base part, the bobbin part is clamped in the taper sleeve part, and the base part is the mounting end of the spindle.
Preferably, the drive plate drive component and the steering block drive component are both arranged on the outer surface of the cylindrical surface or spherical surface twisting chassis and both consist of a motor and a gear set, and the output of the drive plate drive component and the output of the steering block drive component are the power of the drive plate and the power of the steering block respectively.
Preferably, the dial is arranged in a serpentine shape end to end on the inner surface of the stranded chassis with the cylindrical surface or the spherical surface.
Preferably, the turning block center is located at the interval between the intersection point of the axially adjacent groove-shaped fixed spindle track extensions and the intersection point of the circumferentially adjacent groove-shaped fixed spindle track extensions of the uppermost ring and the lowermost ring.
Preferably, the groove-shaped variable spindle tracks comprise crossed spindle tracks and non-crossed spindle tracks; when the groove-shaped variable spindle rails are in a position state I, the adjacent groove-shaped fixed spindle rails form a cross through crossing spindle rails; when the spindle is in the second position state, the adjacent groove-shaped fixed spindle rails are not intersected with each other under the action of the non-crossed spindle rails; when the eye feet are twisted, all the steering blocks are in a second position state; when the twisting and knitting process is carried out, the steering block between the two driving plates of the exchange spindle is in a first position state, and the other steering blocks are in a second position state; the steering block guides the long spindle with the taper sleeve to move across the drive plate and not to move across the drive plate respectively through the position state of the steering block.
Preferably, the crossed spindle orbit and the non-crossed spindle orbit form an included angle of 90 degrees.
Preferably, the crossed spindle track is a straight line groove crossed by two middle points, and when the groove-shaped variable spindle track is in a position state, the crossed spindle track is tangentially connected with the groove-shaped fixed spindle track.
Preferably, the non-intersecting spindle track consists of two circular arc tracks, the radius of the circular arc track is equal to that of the fixed spindle track, and when the groove-shaped variable spindle track is in the position state two, the non-intersecting spindle track is tangentially connected with the groove-shaped fixed spindle track.
The invention also provides a closed knotless braiding method, which is characterized in that the closed knotless braiding equipment adopts the long spindles with the taper sleeves for braiding, during the braiding, n/2 odd drive plates and n/2 even drive plates respectively drive the respective long spindles with the taper sleeves to move in a spindle track from an initial position, the spindle paths of the n/2 odd drive plates and the n/2 even drive plates are closed snakes which are connected end to end and have opposite movement directions, n-time nodes in the braiding are a movement cycle, and the long spindles with the taper sleeves return to the initial position again.
Preferably, the method specifically comprises the following steps:
(1) the groove-shaped variable spindle tracks of all the turning blocks are changed into a position state II, namely a non-crossed spindle track position state, every 2 long spindles with taper sleeves rotate around the centers of the respective driving plates, and the legs are twisted and catalogued to the required length;
(2) the groove-shaped variable spindle tracks of the turning blocks between two drive plates of the exchange spindles are changed to a position state I, namely a crossed spindle track position state, the groove-shaped variable spindle tracks of the other turning blocks are still in a position state II, namely a non-crossed spindle track position state, and long spindles with taper sleeves move across the drive plates between the adjacent drive plates through the crossed spindle tracks to twist and weave nodules;
(3) and (3) circularly performing the step (1) and the step (2) to finish the closed knotless net braiding.
Preferentially, the driving plate driving part and the steering block driving part are driven by a variable frequency speed regulation motor or a stepping motor or a servo motor to realize on-line variable mesh foot twisting; the yarn outlets of the long spindles with the taper sleeves are converged and approach to the outside of the braiding ring infinitely, and the braiding with enough small mesh legs can be realized.
Preferably, the spindle paths of the odd-numbered drive plates and the even-numbered drive plates are in snake shapes which are connected end to end, the moving directions are opposite, and the positions of the twisted knots are alternately changed.
The invention has the following beneficial effects:
(1) the twisted knotless net is a twisted knot, has no protrusion and no local stress concentration, has consistent yarn tension in the twisting process, mainly bears axial force, and has wear resistance and high strength.
(2) The closed type strand knitting machine with the cylindrical surface or spherical surface strand knitting chassis is provided with a long spindle equipment mode with a taper sleeve, the strand knitting of a closed knotless net with enough small or big mesh feet is realized under the limited floor area, and the strand knitting of the mesh feet can be changed on line along the longitudinal direction.
(3) The twisting and weaving efficiency is high, the closed knotless net of the twisting and weaving has good consistency and long service life.
Drawings
FIG. 1 is a closed knotless net braiding apparatus;
FIG. 2 is a schematic diagram of the path of a spindle for braiding closed knotless net nodules;
FIG. 3 is a spindle with a taper sleeve;
FIG. 4 is a schematic diagram of the path of the dial spindles of the closed knotless knot braided by twisting;
fig. 5A and 5B are cylindrical surface braiding chassis and fixed spindle rails thereof;
FIGS. 6A and 6B show a turning block and its variable spindle track;
FIGS. 7A and 7B illustrate a cylindrical surface stranded chassis and drive plate and steering block drive assembly;
fig. 8A and 8B show the position state of the steering block.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The present invention will be further described below by taking a cylindrical surface braiding chassis as an example. The closed knotless braiding equipment disclosed by the embodiment is shown in fig. 1 and comprises a braiding chassis 1 with a cylindrical surface, a frame 4, a braiding ring 5, a braiding ring support 6, a long spindle 2 with a taper sleeve, a drive plate 3, a drive plate driving part, a steering block 7 and a steering block driving part. The frame 4 is installed on the ground, and the braiding chassis 1 is installed on the frame 4. The twisted ring 5 is arranged on a twisted ring bracket 6. The braiding ring 5 is concentric with the inner surface of the braiding chassis 1, n drive plates 3 are arranged on the inner surface of the braiding chassis 1, and n is a positive even number.
With reference to fig. 5A and 5B, the inner surface of the braiding chassis 1 is provided with groove-shaped fixed spindle rails 1-1 and turning block mounting holes 1-2 which are uniformly distributed along the axial direction and the circumferential direction. Steering block mounting holes 1-2 are formed between the axially adjacent groove-shaped fixed spindle tracks 1-1, steering block mounting holes 1-2 are arranged between the groove-shaped fixed spindle tracks 1-1 adjacent to the circumference of the uppermost ring and the groove-shaped fixed spindle tracks adjacent to the circumference of the lowermost ring at intervals, and steering blocks 7 are mounted in the steering block mounting holes 1-2 and driven by a steering block driving component. The centers of the turning block mounting holes 1-2 are positioned at intervals of the intersection points of the extending adjacent groove-shaped fixed spindle tracks 1-1 and the intersection points of the extending adjacent groove-shaped fixed spindle tracks at the periphery of the uppermost ring and the lowermost ring.
A turning block 7 is arranged in each turning block mounting hole 1-2. With reference to fig. 6A and 6B, the turning block 7 has a groove-shaped variable spindle track, and the groove-shaped fixed spindle track and the groove-shaped variable spindle track form a spindle track. The groove-shaped variable spindle track comprises a crossed spindle track 7-1 and a non-crossed spindle track 7-2, and the 90-degree included angle between the crossed spindle track and the non-crossed spindle track is optimal. The crossed spindle track 7-1 is a straight line groove with two crossed midpoints, and the crossed spindle track is preferably in tangential connection with the groove-shaped fixed spindle track 1-1. The non-crossed spindle track 7-2 is composed of two optimal arc tracks which are connected with the groove-shaped fixed spindle track 1-1 in a tangent mode, and the radius of the arc tracks is equal to that of the groove-shaped fixed spindle track 1-1, so that the optimal radius is achieved. The turning block 7 is driven by a turning block driving component, so that the position of the groove-shaped variable spindle track is changed between a first position state and a second position state. When the groove-shaped variable spindle tracks are in the position state I, the adjacent groove-shaped fixed spindle tracks 1-1 form a cross through the crossed spindle tracks 7-1. When the groove-shaped variable spindle rail is in the position state II, the adjacent groove-shaped fixed spindle rails 1-1 are not intersected with each other under the action of the non-crossed spindle rail 7-2.
When the eye feet are twisted, all the steering blocks 7 are in the second position state. When the twisting and knitting are finished, the turning block 7 between the two driving plates of the exchange spindle is in the first position state, and the other turning blocks 7 are in the second position state. The turning block 7 guides the long spindle 2 with the taper sleeve to move across the dial 3 and not across the dial 3 respectively through the position state.
The n dials 3 are driven by a dial driving part. Each dial 3 corresponds to a channel-shaped fixed spindle track 1-1. The 2n long spindles 2 with the taper sleeves move along the spindle orbit under the driving of the drive plate 3 and the turning block 7, and the movement path is realized by the drive plate driving part and the turning block driving part driving the drive plate 3 and the turning block 7. With reference to fig. 1, 5A, 7A and 7B, the dial driving part and the steering block driving part are both mounted on the outer surface of the braiding chassis 1, and are composed of motors 8-1 and 8-2 and gear sets 9-1 and 9-2, and the outputs of the motors are the power of the dial 3 and the steering block 7 respectively. The n/2 odd drive plates and the n/2 even drive plates are arranged in a snake shape in an end-to-end mode on the inner surface of the stranded chassis 1. The spindle paths of the odd drive plates and the even drive plates are all closed snakelike shapes connected end to end, the moving directions are opposite, the nodes are woven in a twisting mode for n times to form a moving cycle, and the long spindle 2 with the taper sleeves returns to the initial position. Fig. 4 is a schematic diagram of the dial spindle path for 8 dial, 8-fold knuckles.
The number of the long spindles 2 with the taper sleeves is twice of that of the drive plates 3. One end of the long spindle 2 is a mounting end, the other end of the long spindle is a yarn outlet, and the yarn outlets of the long spindle 2 are converged and are infinitely close to the outside of the braiding ring 5. The structure of the long spindle 2 is shown in figure 3 and comprises a base part 2-1, a bobbin part 2-2 and a taper sleeve part 2-3, wherein the taper sleeve part 2-3 is fixedly connected on the base part 2-1, the bobbin part 2-2 is clamped in the taper sleeve part 2-3, the base part 2-1 is a mounting end of the long spindle 2 and is mounted in a notch of a driving plate 3 and a spindle track on the inner surface of a twisting and weaving chassis 1, and each driving plate 3 corresponds to 2 long spindles 2.
The embodiment also discloses a closed knotless net twisting method, wherein the twisting equipment adopts a long spindle 2 with a taper sleeve for twisting, and the principle of the spindle path of the twisted knot is shown in figure 2.
The method specifically comprises the following steps:
(1) the groove-shaped variable spindle orbit of all the turning blocks 7 is changed into a position state II, namely a non-crossed spindle orbit position state, each 2 of the long spindles 2 with the taper sleeves rotate around the center of the corresponding driving plate 3, and the mesh feet are twisted to the required length. As shown in FIG. 8A, when the ocular feet are twisted, all the turning blocks a and b are in the state of non-crossed spindle orbit positions.
(2) The groove-shaped variable spindle tracks of the turning blocks 7 between two driving plates 3 of the exchange spindles are changed to a position state I, namely a crossed spindle track position state, the groove-shaped variable spindle tracks of the other turning blocks 7 are still in a position state II, namely a non-crossed spindle track position state, and the long spindles 2 with the taper sleeves move across the driving plates between the driving plates through the crossed spindle tracks to splice nodes. As shown in fig. 8B, at the time of twist-knitting, the turning block B between the two dials 3 of the exchange spindle is in the state of crossing spindle orbit position, and the remaining turning blocks a are in the state of not crossing spindle orbit position. The turning blocks a and b respectively guide the long spindle 2 with the taper sleeve to move across the drive plate 3 and not to move across the drive plate 3.
(3) And (3) circularly performing the step (1) and the step (2) to finish the closed knotless net braiding.
The driving plate driving part and the steering block driving part are driven by a variable frequency speed regulation and a stepping motor or a servo motor to realize on-line variable mesh foot twisting; the yarn outlets of the long spindles 2 with the taper sleeves are converged and are infinitely close to the outside of the twisting ring 5, so that twisting with small enough mesh feet is realized.
The spindle paths of the odd drive plates 3 and the even drive plates 3 are snakelike shapes connected end to end, the moving directions are opposite, and the positions of the twisted knots are alternately changed.
Claims (13)
1. A closed knotless net braiding device is characterized by comprising a braiding chassis with a cylindrical surface or a spherical surface and a long spindle with a taper sleeve; the twisting base plate is arranged on the rack and is coaxially arranged with the twisting ring arranged on the twisting ring bracket; the n drive plates driven by the drive plate driving part are arranged on the inner surface of the stranded chassis; the inner surface of the twisting and weaving chassis is provided with groove-shaped fixed spindle tracks which are distributed along the axial direction and the circumferential direction and correspond to the n drive plates, and n is a positive even number; steering block mounting holes are formed between the axially adjacent groove-shaped fixed spindle rails, steering block mounting holes are formed between the groove-shaped fixed spindle rails circumferentially adjacent to the uppermost ring and the lowermost ring at intervals, and the steering blocks are mounted in the steering block mounting holes and driven by a steering block driving component; the turning block is provided with a groove-shaped variable spindle track, when the groove-shaped variable spindle track is in a position state I, the adjacent groove-shaped fixed spindle tracks are crossed through the groove-shaped variable spindle track, when the groove-shaped variable spindle track is in a position state II, the adjacent groove-shaped fixed spindle tracks are not crossed at the groove-shaped variable spindle track, and the groove-shaped fixed spindle track and the groove-shaped variable spindle track form a spindle track together; one end of the long spindle with the taper sleeve is a mounting end, and the other end of the long spindle is a yarn outlet; the mounting ends of 2n long spindles with taper sleeves are arranged in notches of the n driving plates and spindle tracks, and the two long spindles with taper sleeves correspond to one driving plate; the yarn outlets of 2n long spindles with taper sleeves are converged and infinitely close to the outside of the twisting ring; the n/2 odd drive plates and the n/2 even drive plates respectively drive the corresponding long spindles with taper sleeves to move in the spindle tracks from the initial positions, the spindle paths of the n/2 odd drive plates and the n/2 even drive plates are all closed snakes connected end to end and have opposite moving directions, n-time nodes are twisted to form a moving cycle, and the long spindles with taper sleeves return to the initial positions again.
2. The closed knotless net braiding apparatus according to claim 1, wherein the long spindle with the taper sleeve is composed of a base member, a bobbin member and a taper sleeve member, the taper sleeve member is fixedly connected to the base member, the bobbin member is clamped into the taper sleeve member, and the base member is a mounting end of the spindle.
3. The closed knotless braiding apparatus according to claim 1, wherein the dial driving part and the turning block driving part are both mounted on the outer surface of the cylindrical or spherical braiding chassis, and both consist of a motor and a gear set, and the outputs of the motors are the powers of the dial and the turning block, respectively.
4. The closed knotless braiding apparatus of claim 1 wherein the dials are in an end-to-end serpentine arrangement on the inner surface of the braiding pan having cylindrical or spherical surfaces.
5. The closed knotless net braiding apparatus according to claim 1, wherein the turning block centre is located at the interval between the intersection point where axially adjacent groove-shaped fixed spindle tracks extend and the intersection point where the uppermost and lowermost turns circumferentially adjacent groove-shaped fixed spindle tracks extend.
6. The closed knotless net braiding equipment according to claim 1, wherein the grooved variable spindle track comprises crossed spindle tracks and non-crossed spindle tracks; when the groove-shaped variable spindle rails are in a position state I, the adjacent groove-shaped fixed spindle rails form a cross through crossing spindle rails; when the spindle is in the second position state, the adjacent groove-shaped fixed spindle rails are not intersected with each other under the action of the non-crossed spindle rails; when the eye feet are twisted, all the steering blocks are in a second position state; when the twisting and knitting process is carried out, the steering block between the two driving plates of the exchange spindle is in a first position state, and the other steering blocks are in a second position state; the steering block guides the long spindle with the taper sleeve to move across the drive plate and not to move across the drive plate respectively through the position state of the steering block.
7. A closed knotless net braiding apparatus according to claim 6, wherein the crossed spindle track is at a 90 ° angle to the non-crossed spindle track.
8. The closed knotless net braiding equipment according to claim 6, wherein the crossed spindle track is a straight groove crossed at two middle points, and when the groove-shaped variable spindle track is in a position state, the crossed spindle track is tangentially connected with the groove-shaped fixed spindle track.
9. The closed knotless net braiding equipment according to claim 6, wherein the non-intersecting spindle track consists of two circular arc tracks, the radius of the circular arc track is equal to the radius of the fixed spindle track, and when the groove-shaped variable spindle track is in position two, the non-intersecting spindle track is tangentially connected with the groove-shaped fixed spindle track.
10. A closed knotless braiding method is characterized in that the long spindles with the taper sleeves are adopted for braiding on the closed knotless braiding equipment according to claim 1, during braiding, n/2 odd-numbered drive plates and n/2 even-numbered drive plates respectively drive the respective long spindles with the taper sleeves to move in a spindle track from an initial position, spindle paths of the n/2 odd-numbered drive plates and the n/2 even-numbered drive plates are closed snakes connected end to end and are opposite in moving direction, n-time knotting is one movement cycle, and the long spindles with the taper sleeves return to the initial position again.
11. The closed knotless net braiding method according to claim 10, which comprises the following steps:
(1) the groove-shaped variable spindle tracks of all the turning blocks are changed into a position state II, namely a non-crossed spindle track position state, every 2 long spindles with taper sleeves rotate around the centers of the respective driving plates, and the legs are twisted and catalogued to the required length;
(2) the groove-shaped variable spindle tracks of the turning blocks between two drive plates of the exchange spindles are changed to a position state I, namely a crossed spindle track position state, the groove-shaped variable spindle tracks of the other turning blocks are still in a position state II, namely a non-crossed spindle track position state, and long spindles with taper sleeves move across the drive plates between the adjacent drive plates through the crossed spindle tracks to twist and weave nodules;
(3) and (3) circularly performing the step (1) and the step (2) to finish the closed knotless net braiding.
12. The method of claim 11, wherein the driver plate and the steering block are driven by a variable frequency speed control, stepping motor or servo motor to realize on-line variable mesh foot twisting; the yarn outlets of the long spindles with the taper sleeves are converged and approach to the outside of the braiding ring infinitely, and the braiding with enough small mesh legs can be realized.
13. The method of claim 11, wherein the spindle paths of the odd-numbered dial groups and the even-numbered dial groups are serpentine shapes connected end to end, the moving directions are opposite, and the positions of the braiding nodes are alternately changed.
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| CN201911134224.0A CN111020863B (en) | 2019-11-19 | 2019-11-19 | Closed knotless net braiding equipment and method |
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| CN111020863B (en) | 2020-12-08 |
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