CN112609323B - Special driver plate sliding block for rotary three-dimensional weaving device - Google Patents
Special driver plate sliding block for rotary three-dimensional weaving device Download PDFInfo
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- CN112609323B CN112609323B CN202110030950.9A CN202110030950A CN112609323B CN 112609323 B CN112609323 B CN 112609323B CN 202110030950 A CN202110030950 A CN 202110030950A CN 112609323 B CN112609323 B CN 112609323B
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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
- D04C3/02—Braiding or lacing machines with spool carriers guided by track plates or by bobbin heads exclusively
- D04C3/14—Spool carriers
- D04C3/18—Spool carriers for vertical spools
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Abstract
The utility model provides a special driver plate slider of device is woven to three-dimensional of rotation type, relate to the three-dimensional device field of weaving, including the slider base, the slider, slider seat of honour and yarn hub connection press from both sides, slider base middle part is equipped with the direction reference column of transversal personally submitting the rectangle, the setting of slider seat of honour is in direction reference column top, yarn hub connection presss from both sides the setting on slider seat of honour, the slider includes first half slider, half slider of second, the spout is connected to the U-shaped, left side mounting groove and right mounting groove, be equipped with the separation torsional spring in left side mounting groove and the right mounting groove respectively, two arm of force of separation torsional spring in the left side mounting groove respectively with the inside wall contact cooperation of first half slider and the half slider of second, two arm of force of separation torsional spring in the right side mounting groove link to each other with the inside wall of first half slider and the half slider of second respectively, the separation torsional spring exerts opposite direction's separating force to first half slider and the half slider of second. The invention has the advantages of simple and stable structure, small volume, low processing cost, smooth operation, difficult blockage, high weaving quality and the like.
Description
Technical Field
The invention relates to the field of three-dimensional weaving devices, in particular to a special dial slide block for a rotary three-dimensional weaving device, which has the advantages of simple and stable structure, small volume, low processing cost, smooth operation, difficult blockage and high weaving quality.
Background
Three-dimensional weaving is a new technology developed in the 60's of the 20 th century, and is developed to overcome the inherent disadvantage of the conventional two-dimensional woven molding material, i.e., the easy delamination under shear stress and alternating stress. Three-dimensional weaving is developed on the basis of two-dimensional weaving, and compared with a laminated composite material, the method for obtaining the three-dimensional woven fabric by integrally forming two or more than two mutually-wound yarn systems has a completely integrated and non-laminated structure and can be used for manufacturing structural parts and high-functional parts. The three-dimensional braided composite material is prepared by weaving reinforced fibers into a three-dimensional integral fabric by utilizing a braiding technology and compounding the three-dimensional integral fabric with a matrix (comprising resin, carbon, silicon carbide, metal and the like) so as to prepare a composite material part, so that the problem of insufficient interlayer bonding force does not exist in the three-dimensional braided composite material part, and the three-dimensional braided composite material has wide application in aerospace structural parts, friction parts, aerospace ablation-resistant parts and new energy automobiles. The key of the three-dimensional knitting technology is a three-dimensional knitting machine, and the current three-dimensional knitting machines are divided into a vertical and horizontal stepping knitting machine and a rotary knitting machine. The vertical rotary knitting machine is a knitting machine with high efficiency and low cost at present, the key part of the current rotary three-dimensional knitting machine is a driving plate sliding block, and due to the gravity of the driving plate sliding block, the manufacturing (size) error of each part of the rotary three-dimensional knitting machine and the reserved gap between each relative operation part, the driving plate sliding block of the vertical rotary knitting machine is easy to have the phenomena of mechanical clamping and motor desynchronization in the working process, and has the defects of poor knitting quality, serious shutdown, damage to the knitting machine and the like. The horizontal rotary braiding machine has the problems that mechanical clamping and motor step-out phenomena easily occur during working of the driving plate sliding block due to (size) errors generated during manufacturing of all parts and gaps reserved between all relative running parts, the braiding quality is poor, and shutdown and damage to the braiding machine are seriously caused.
The application numbers are: JP04105426, publication (bulletin) No.: JP06025955A, name: the driving method of the three-dimensional knitting machine discloses a working method of a rotary knitting machine in the prior art, wherein a carrier 3 is a driving plate slide block disclosed in the invention, and the application number 201710379954.1 and the invention name disclosed by the national intellectual property office are as follows: in the patent document of the closed annular tubular textile knitting machine and the knitting method thereof, as can be seen from the drawing, the knitting machine is also a rotary three-dimensional knitting machine, and the part for driving the yarn spool to move is the driving plate sliding block in the invention. The dial slide has the above-mentioned drawbacks.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides the special sliding block for the rotary three-dimensional weaving device, which has the advantages of simple and stable structure, small volume, low processing cost, smooth operation, difficult blockage and high weaving quality.
The technical scheme adopted by the invention for solving the defects of the prior art is as follows:
a driver plate slide block special for a rotary three-dimensional weaving device comprises a slide block base, a slide block upper seat and a yarn shaft connecting clamp, wherein a guide positioning column is arranged in the middle of the slide block base, the slide block upper seat is arranged above the guide positioning column, and the yarn shaft connecting clamp is arranged on the slide block upper seat, and the driver plate slide block is characterized in that the cross section of the guide positioning column is rectangular, the slide block comprises a first half slide block and a second half slide block, a U-shaped connecting chute matched with the guide positioning column is arranged in the middle of the first half slide block and the second half slide block, the left side and the right side of the U-shaped connecting chute on the inner sides of the first half slide block and the second half slide block are respectively provided with a left notch and a right notch, the inner sides of the first half slide block and the second half slide block are oppositely arranged between the slide block base and the slide block upper seat in a free sliding manner, and the U-shaped connecting chute on the inner sides of the first half slide block and the second half slide block are in clearance fit with the guide positioning column, the left mounting groove is relatively constituteed to the left notch of first half slider and the left notch of second half slider, right mounting groove is relatively constituteed to the right notch of first half slider and the right notch of second half slider, be equipped with the torsional spring fitting pin on slider base and/or the slider seat of honour in left mounting groove and the right mounting groove respectively, be equipped with the separation torsional spring on the torsional spring fitting pin, two arm of force of separation torsional spring in the left mounting groove respectively with the left notch inside wall of first half slider and the left notch inside wall contact fit of second half slider, two arm of force of separation torsional spring in the right mounting groove link to each other with the right notch inside wall of first half slider and the right notch inside wall of second half slider respectively, the separation torsional spring exerts opposite direction's separating force to first half slider and second half slider.
The sliding block base and the sliding block upper seat are provided with connecting screws which respectively penetrate through the left mounting groove and the right mounting groove. The slider base and the slider upper seat are connected more stably, and the running stability is improved.
The yarn shaft connecting clamp is characterized in that a cylindrical inserting seat is arranged on an upper seat of a sliding block, and a locking screw hole is formed in the side wall of the inserting seat. The lower end of the yarn shaft is inserted into the plug socket, the locking bolt is screwed into the locking screw hole and abuts against the lower end of the yarn shaft to fixedly connect the yarn shaft with the plug socket. Two semicircular clamping plates which are oppositely arranged are arranged on the upper end face of the plug socket, and play a role in pre-clamping the lower part of the yarn shaft.
The left notch and the right notch are triangular or trapezoidal, the side wall of the first half sliding block in contact fit with the force arm of the separation torsion spring is in a V shape, and the side wall of the second half sliding block in contact fit with the force arm of the separation torsion spring is in a V shape; the side wall of the right notch of the first half sliding block in contact fit with the force arm of the separation torsion spring and the side wall of the right notch of the second half sliding block in contact fit with the force arm of the separation torsion spring are V-shaped. A separation torsion spring is positioned in the left mounting groove, and two force arms of the separation torsion spring are respectively in contact fit with the inner side wall of the left notch of the first half sliding block and the inner side wall of the left notch of the second half sliding block which are arranged in a V shape; a separation torsional spring is located right mounting groove, its two arm of force respectively with be the contact cooperation of the right notch inside wall of the first half slider of V-arrangement and the right notch inside wall of the half slider of second. The first half sliding block and the second half sliding block are of symmetrical structures and are symmetrical along the bisector of the middle of each sliding block; balanced stress and stable operation.
The two left notch inner side walls and the two right notch inner side walls (cross sections) which are in contact fit with the two force arms of the separation torsion spring are V-shaped (arranged). Two force arms of the separation torsion spring and two left notch inner side walls and two right notch inner side walls which are in a V shape enable the first half sliding block and the second half sliding block to be separated relatively under the action of elasticity.
When the yarn driving device is used, the driving plate sliding block is matched with the driving plate of the vertical type rotating three-dimensional weaving device, the sliding block is arranged in a driving sliding groove between two driving plates of the vertical type rotating three-dimensional weaving device or between one driving plate and a shell (of the vertical type rotating three-dimensional weaving device), the sliding block base and the sliding block upper seat are respectively positioned at the front side and the rear side of the driving plate, the outer sides of the first half sliding block and the second half sliding block are respectively tightly attached to the side wall of the driving sliding groove of the driving plate or the side walls of the driving sliding groove on the driving plate and the shell under the action of a separation torsion spring, and the yarn shaft connecting clamp is used for being connected with a yarn shaft; the driving plate can drive the sliding block to move in different driving sliding grooves so as to drive the yarn shaft to move and finish three-dimensional weaving.
The invention divides a sliding block into a first half sliding block and a second half sliding block which are symmetrical, two separating torsion springs arranged between the first half sliding block and the second half sliding block are adopted to provide power, so that the periphery of the sliding block is well contacted with adjacent driving plates, the first half sliding block and the second half sliding block can move oppositely and generate a gap with the adjacent driving plates when being pressed and moved under the action of external force, and the sliding block can stably move in a driving sliding groove formed by the adjacent two driving plates. The position of the sliding block is downward due to the self gravity and the rotating clearance, and the problem that the driving plate can be clamped and cannot move under the condition that the clearance does not exist between the sliding block and the driving plate can be solved. The invention can also be used in the horizontal three-dimensional knitting machine because the horizontal three-dimensional knitting machine also has the problem of revolving clearance. The invention has small volume, low cost and high universality, can be widely applied to the rotary three-dimensional knitting machine, reduces mechanical blockage caused by the slide block, reduces the maintenance and repair cost, and improves the production efficiency and the product quality. When the inner sides of the first half sliding block and the second half sliding block are oppositely arranged in a driving sliding groove, the distance between the inner side surface of the first half sliding block and the inner side surface of the second half sliding block is 0.1-3mm, preferably 1-2 mm.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a sectional view a-a of fig. 1.
Fig. 3 is a sectional view B-B of fig. 1.
Fig. 4 is a schematic perspective view of the present invention.
Detailed Description
The special dial slide block for the rotary three-dimensional weaving device shown in fig. 1-4 comprises a slide block base 1, a slide block upper seat 3 and a yarn shaft connecting clamp, wherein a guide positioning column 7 is arranged in the middle of the slide block base 1, the slide block upper seat 3 is arranged above the guide positioning column 7, the slide block upper seat 3 is fixedly connected with the slide block base 1 through a bolt 15, and the slide block upper seat 3 can also be fixedly connected with the guide positioning column 7 or integrally manufactured. The yarn shaft connecting clamp is arranged on the sliding block upper seat 3, the yarn shaft connecting clamp is characterized in that a cylindrical inserting seat 4 is arranged on the sliding block upper seat 3, and a locking screw hole 6 is arranged on the side wall of the inserting seat 4; when the yarn shaft locking device is used, the lower end of the yarn shaft is inserted into the plug socket 6, the locking bolt is screwed into the locking screw hole 6 and abuts against the lower end of the yarn shaft to fixedly connect the yarn shaft with the plug socket; furthermore, two semicircular clamping plates 5 which are oppositely arranged are arranged on the upper end surface of the plug socket 6, and play a role in pre-clamping the lower part of the yarn shaft. The cross section of the guide positioning column 7 is rectangular, the sliding blocks comprise a first half sliding block 2 and a second half sliding block 9 which are the same in shape, the inner side surfaces of the first half sliding block 2 and the second half sliding block 9 are planes, the outer side surfaces of the first half sliding block 2 and the second half sliding block 9 are arc-shaped surfaces, and the first half sliding block 2 and the second half sliding block 9 are oppositely arranged to form a combined sliding block with the periphery being the same as the peripheral shape of the sliding block in the driving plate sliding block in the prior art. The middle parts of the inner sides of the first half sliding block 2 and the second half sliding block 9 are respectively provided with a U-shaped connecting sliding chute 14 matched with the guide positioning column 7, the left side and the right side of the U-shaped connecting sliding chute 14 of the inner sides of the first half sliding block 2 and the second half sliding block 9 are respectively provided with a left notch 16, a right notch 13 and a right notch 10, the inner sides of the first half sliding block and the second half sliding block are opposite and can freely slide between the sliding block base 1 and the sliding block upper seat 3, the U-shaped connecting sliding chute 14 of the inner sides of the first half sliding block and the second half sliding block is in clearance fit with the guide positioning column 7, and the clearance between the left inner side wall and the right inner side wall of the U-shaped connecting sliding chute 14 and the two opposite side walls of the guide positioning column is 0.1-1mm, preferably 0.3-0.5 mm. The left notch 16 of the first half sliding block 2 and the left notch 8 of the second half sliding block 9 form a left mounting groove relatively, the right notch 13 of the first half sliding block and the right notch 10 of the second half sliding block form a right mounting groove relatively, the middle sliding block base and the sliding block upper seat in the left mounting groove and the right mounting groove are respectively provided with a torsional spring mounting pin 12, as can be seen from the figure, the torsional spring mounting pin 12 is a screw rod connecting the sliding block base and the sliding block upper seat, the torsional spring mounting pin 12 is provided with a separation torsional spring 11, two force arms of the separation torsional spring in the left mounting groove are respectively attached to and pressed tightly with the left notch 16 inner side wall of the first half sliding block and the left notch 8 inner side wall of the second half sliding block, the two force arms of the separation torsional spring 11 in the right mounting groove are respectively connected with the right notch 13 inner side wall of the first half sliding block and the right notch 10 inner side wall of the second half sliding block, and the separation torsional spring applies separation force in opposite directions to the first half sliding block and the second half sliding block, So that they can move away from each other. And the sliding block base and the sliding block upper seat are provided with connecting screws 15 which respectively penetrate through the left mounting groove and the right mounting groove. The connecting screw 15 connects the base of the sliding block and the upper base of the sliding block firmly, so that the structure is more stable, and the running stability is improved. When the inner sides of the first half sliding block and the second half sliding block are oppositely arranged in a driving sliding groove, the distance between the inner side surface of the first half sliding block and the inner side surface of the second half sliding block is 0.1-3mm, preferably 1-2 mm.
The left notches 16 and 8 and the right notches 13 and 10 are triangular or trapezoidal, the side wall of the first half sliding block, which is in contact fit with the force arm of the separation torsion spring, of the left notch 16 and the side wall of the second half sliding block, which is in contact fit with the force arm of the separation torsion spring, of the left notch 8 are arranged in a V shape; the side wall of the right notch of the first half sliding block in contact fit with the force arm of the separation torsion spring and the side wall of the right notch of the second half sliding block in contact fit with the force arm of the separation torsion spring are V-shaped. A separation torsion spring is positioned in the left mounting groove, and two force arms of the separation torsion spring are respectively in contact fit with the inner side wall of the left notch of the first half sliding block and the inner side wall of the left notch of the second half sliding block which are arranged in a V shape; a separation torsional spring is located right mounting groove, its two arm of force respectively with be the contact cooperation of the right notch inside wall of the first half slider of V-arrangement and the right notch inside wall of the half slider of second. The first half sliding block and the second half sliding block are of symmetrical structures and are symmetrical along the bisector of the middle of each sliding block; balanced stress and stable operation.
The invention adopts electron beam 3D printing technology to carry out one-step forming, firstly, a slide block base, a first half slide block, a second half slide block and a slide block upper seat are respectively manufactured by 3D printing for standby, and then, the assembly is carried out in a driving chute between two driving plates or between one driving plate and a shell of a rotary three-dimensional knitting machine according to the structural sequence shown in the attached drawings of the specification; the slide block is arranged in a driving sliding groove between two drive plates or between one drive plate and a shell of the vertical rotary three-dimensional knitting device, and the slide block base and the slide block upper seat are respectively positioned at the front side and the rear side of the drive plate.
When the yarn driving device is used, the driving plate sliding block is matched with the driving plate of the vertical type rotating three-dimensional weaving device, the sliding block is arranged in a driving sliding groove between two driving plates of the vertical type rotating three-dimensional weaving device or between one driving plate and a shell (of the vertical type rotating three-dimensional weaving device), the sliding block base and the sliding block upper seat are respectively positioned at the front side and the rear side of the driving plate, the outer sides of the first half sliding block and the second half sliding block are respectively tightly attached to the side wall of the driving sliding groove of the driving plate or the side walls of the driving sliding groove on the driving plate and the shell under the action of a separation torsion spring, and the yarn shaft connecting clamp is used for being connected with a yarn shaft; the driving plate can drive the sliding block to move in different driving sliding grooves so as to drive the yarn shaft to move and finish three-dimensional weaving.
The invention divides a sliding block into a first half sliding block and a second half sliding block which are symmetrical, two separating torsion springs arranged between the first half sliding block and the second half sliding block are adopted to provide power, so that the periphery of the sliding block is well contacted with adjacent driving plates, when the first half sliding block and the second half sliding block are pressed by external force, the pressing separating torsion springs can move oppositely and generate gaps with the adjacent driving plates, and the sliding block can stably move in a driving sliding chute formed by the adjacent two driving plates. The position of the sliding block is downward due to the self gravity and the rotating clearance, and the problem that the driving plate can be clamped and cannot move under the condition that the clearance does not exist between the sliding block and the driving plate can be solved. The invention can also be used in the horizontal three-dimensional knitting machine because the horizontal three-dimensional knitting machine also has the problem of revolving clearance. The invention has small volume, low cost and high universality, can be widely applied to the rotary three-dimensional knitting machine, has low precision requirement on a drive plate system and large allowable error due to the adjustability of the slide block, reduces mechanical jamming caused by the slide block, reduces the maintenance and repair cost, and improves the production efficiency and the product quality.
Claims (5)
1. A driver plate slide block special for a rotary three-dimensional weaving device comprises a slide block base, a slide block upper seat and a yarn shaft connecting clamp, wherein a guide positioning column is arranged in the middle of the slide block base, the slide block upper seat is arranged above the guide positioning column, and the yarn shaft connecting clamp is arranged on the slide block upper seat, and the driver plate slide block is characterized in that the cross section of the guide positioning column is rectangular, the slide block comprises a first half slide block and a second half slide block, a U-shaped connecting chute matched with the guide positioning column is arranged in the middle of the first half slide block and the second half slide block, the left side and the right side of the U-shaped connecting chute on the inner sides of the first half slide block and the second half slide block are respectively provided with a left notch and a right notch, the inner sides of the first half slide block and the second half slide block are oppositely arranged between the slide block base and the slide block upper seat in a free sliding manner, and the U-shaped connecting chute on the inner sides of the first half slide block and the second half slide block are in clearance fit with the guide positioning column, the left mounting groove is relatively constituteed to the left notch of first half slider and the left notch of second half slider, right mounting groove is relatively constituteed to the right notch of first half slider and the right notch of second half slider, be equipped with the torsional spring fitting pin on slider base and/or the slider seat of honour in left mounting groove and the right mounting groove respectively, be equipped with the separation torsional spring on the torsional spring fitting pin, two arm of force of separation torsional spring in the left mounting groove respectively with the left notch inside wall of first half slider and the left notch inside wall contact fit of second half slider, two arm of force of separation torsional spring in the right mounting groove link to each other with the right notch inside wall of first half slider and the right notch inside wall of second half slider respectively, the separation torsional spring exerts opposite direction's separating force to first half slider and second half slider.
2. The dial slide for rotary three-dimensional knitting machine as claimed in claim 1, wherein said slide base and said slide upper seat are provided with a connection screw passing through the left and right mounting grooves, respectively.
3. The dial slide block for rotary three-dimensional knitting machine as claimed in claim 1, wherein the yarn shaft connecting clip is a barrel-shaped socket on the upper seat of the slide block, and the side wall of the socket is provided with a locking screw hole.
4. The dial slide block specially used for the rotary three-dimensional knitting device according to claim 1, wherein the left and right notches are triangular or trapezoidal, the side wall of the first half slide block where the left notch is in contact fit with the arm of force of the separation torsion spring and the side wall of the second half slide block where the left notch is in contact fit with the arm of force of the separation torsion spring are V-shaped; the side wall of the right notch of the first half sliding block in contact fit with the force arm of the separation torsion spring and the side wall of the right notch of the second half sliding block in contact fit with the force arm of the separation torsion spring are V-shaped.
5. The dial slide for a rotary three-dimensional knitting device as claimed in claim 1, wherein the two left and right inner side walls of the notch engaged in contact with the two arms of the separation torsion spring are V-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110030950.9A CN112609323B (en) | 2021-01-11 | 2021-01-11 | Special driver plate sliding block for rotary three-dimensional weaving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110030950.9A CN112609323B (en) | 2021-01-11 | 2021-01-11 | Special driver plate sliding block for rotary three-dimensional weaving device |
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| Publication Number | Publication Date |
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| CN112609323A CN112609323A (en) | 2021-04-06 |
| CN112609323B true CN112609323B (en) | 2022-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110030950.9A Active CN112609323B (en) | 2021-01-11 | 2021-01-11 | Special driver plate sliding block for rotary three-dimensional weaving device |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2486572Y (en) * | 2001-04-18 | 2002-04-17 | 陈妙翰 | Trotting horse base for braider |
| CN2517762Y (en) * | 2001-11-14 | 2002-10-23 | 池锦祥 | Feeding spool of strip braider |
| CN202415899U (en) * | 2011-11-30 | 2012-09-05 | 泉州市三星消防设备有限公司 | Knitter line breakage stop device |
| CN207512375U (en) * | 2017-11-17 | 2018-06-19 | 丁旭杰 | A kind of magnetic induction broken string automatic stop arrangement of high speed belt rope knitting machine |
| CN108754848A (en) * | 2018-07-23 | 2018-11-06 | 浙江金桥铜业科技有限公司 | Copper strips braider |
| DE202018106642U1 (en) * | 2018-11-22 | 2018-11-29 | Sipra Patententwicklungs- Und Beteiligungsgesellschaft Mbh | Compensation assembly for round braiding machine |
| CN210394738U (en) * | 2019-07-24 | 2020-04-24 | 绍兴小柯宠物用品有限公司 | Yarn feeding device of rope belt knitting machine |
-
2021
- 2021-01-11 CN CN202110030950.9A patent/CN112609323B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2486572Y (en) * | 2001-04-18 | 2002-04-17 | 陈妙翰 | Trotting horse base for braider |
| CN2517762Y (en) * | 2001-11-14 | 2002-10-23 | 池锦祥 | Feeding spool of strip braider |
| CN202415899U (en) * | 2011-11-30 | 2012-09-05 | 泉州市三星消防设备有限公司 | Knitter line breakage stop device |
| CN207512375U (en) * | 2017-11-17 | 2018-06-19 | 丁旭杰 | A kind of magnetic induction broken string automatic stop arrangement of high speed belt rope knitting machine |
| CN108754848A (en) * | 2018-07-23 | 2018-11-06 | 浙江金桥铜业科技有限公司 | Copper strips braider |
| DE202018106642U1 (en) * | 2018-11-22 | 2018-11-29 | Sipra Patententwicklungs- Und Beteiligungsgesellschaft Mbh | Compensation assembly for round braiding machine |
| CN210394738U (en) * | 2019-07-24 | 2020-04-24 | 绍兴小柯宠物用品有限公司 | Yarn feeding device of rope belt knitting machine |
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| CN112609323A (en) | 2021-04-06 |
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