CN113512815A - Needle piece of warp knitting machine - Google Patents
Needle piece of warp knitting machine Download PDFInfo
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- CN113512815A CN113512815A CN202110808914.0A CN202110808914A CN113512815A CN 113512815 A CN113512815 A CN 113512815A CN 202110808914 A CN202110808914 A CN 202110808914A CN 113512815 A CN113512815 A CN 113512815A
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- needle
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- knitting machine
- warp knitting
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B35/00—Details of, or auxiliary devices incorporated in, knitting machines, not otherwise provided for
- D04B35/02—Knitting tools or instruments not provided for in group D04B15/00 or D04B27/00
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Abstract
A needle element for a warp knitting machine, the profile curve of the moving wear area of the needle element consisting of more than one function curve. The principle of the invention is as follows: through research and analysis, the function curve is utilized to optimize the contour curve of the needle motion wear area, so that the acceleration change of the coil in the knocking-over process can be optimized, the positive pressure of the yarn acting on the needle is reduced, the needle wear is reduced, and the service life of the needle is prolonged.
Description
Technical Field
The invention relates to the field of warp knitting, in particular to a needle piece of a warp knitting machine.
Background
The design method of the traditional needle piece of the warp knitting machine is that all functional parts of the needle piece are connected through standard geometric figures such as circular arcs, straight lines and the like, namely the outer contour line of the needle piece is formed by connecting the straight lines and the circular arcs. The traditional needle piece design method mainly aims at the condition that the running speed of a warp knitting machine is 3000 turns or below, and provides higher design requirements for the needle piece along with the increase of the running speed of the warp knitting machine. The running speed of the high-speed warp knitting machine can reach more than 4400r/min, along with the continuous improvement of the running speed of the high-speed warp knitting machine, the abrasion of a needle piece by a novel environment-friendly yarn which is designed according to a traditional method is aggravated, the needle piece cannot adapt to the latest raw material and the working state of high-speed running, the service life is greatly reduced, and the economic benefit of an enterprise is obviously reduced. The needle wear conditions are counted and analyzed, the needle wear is mainly found at the needle back and the needle groove, and due to the fact that stress catastrophe points exist on contour lines of the needle back and the needle groove and the resistance in the looping process is large, the yarn generates large friction force on the needle back and the needle groove in the motion processes of loop releasing and loop withdrawing, the needle stress is increased sharply in the loop changing process at the two positions, and the wear is aggravated.
Disclosure of Invention
The invention aims to provide a needle piece of a warp knitting machine, which reduces the resistance in the looping process, eliminates stress catastrophe points and reduces the abrasion of the needle piece.
In order to solve the technical problems, the technical scheme of the invention is as follows: a needle element for a warp knitting machine, the profile curve of the moving wear area of the needle element consisting of more than one function curve. The principle of the invention is as follows: through research and analysis, the function curve is utilized to optimize the contour curve of the needle motion wear area, so that the acceleration change of the coil in the knocking-over process can be optimized, the positive pressure of the yarn acting on the needle is reduced, the needle wear is reduced, and the service life of the needle is prolonged.
As an improvement, the needle element comprises a grooved needle, and the back contour curve of the grooved needle and/or the groove contour curve of the grooved needle are/is composed of more than one function curve.
As an improvement, the function curve is an equal acceleration curve, a simple harmonic curve, a cycloid curve, a modified trapezoidal curve, a modified sinusoidal curve or a modified constant speed curve.
As a refinement, the function curve is a modified sinusoid.
As an improvement, the needle back contour curve and the grooved needle contour curve are formed by sequentially connecting three sections of curves,
a first curve segment:
a second curve segment:
a third curve segment:
wherein the content of the first and second substances,
T2＝1-T1，，
S2＝1-S1。
as an improvement, in the needle back profile curve: t is 0.16 and the displacement distance S is 3.29 from a position 1.8-2.2 mm away from the needle point to a position 5.0-5.5 mm away from the needle point.
As an improvement, in the needle groove profile curve: t is 1.07 and the displacement distance S is 3.14 from a position 1.0-1.1 mm away from the needle point to a position 4.0-4.3 mm away from the needle point.
As a modification, the grooved needle model is 4341.
As an improvement, the surface of the groove pin is provided with a PVD coating.
As an improvement, the PVD coating is a DLC coating or a tungsten carbide coating.
Compared with the prior art, the invention has the following beneficial effects:
1. the local contour line of the needle is optimized through the function curve, the condition of local severe abrasion is effectively improved, and the service life of the needle is longer;
2. the acceleration of the connecting point of the groove needle contour line is zero, so that higher machine running speed can be supported, and the production efficiency is improved;
3. the diameter change of the coil is minimum in the motion process, the looping process is more stable, and the quality of the knitted warp knitting product is better.
Drawings
Fig. 1 is a schematic view of the close fit of the grooved needle and the needle core.
Fig. 2 is a schematic view of a grooved needle.
Fig. 3 is a schematic diagram of the back contour curve optimization of the grooved needle.
FIG. 4 is a schematic diagram of the optimization of the groove profile curve of the grooved needle.
FIG. 5 is a graph comparing the profile of the needle back before and after optimization.
Fig. 6 is an enlarged view of the prior art core head mated with the grooved needle tip.
Fig. 7 is an enlarged view of the engagement of the head of the hub with the slot needle of the present invention.
Fig. 8 is a schematic view of a prior art stylet.
Fig. 9 is a schematic view of a stylet of the invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in figure 1, the needle piece of the warp knitting machine comprises a groove needle 1 and a needle core 2 matched with the groove needle 1, and the groove needle 1 is matched with the needle core 2 to realize knitting. The invention is explained for the grooved needle 1 with the model number of 4341, and other models of grooved needles are also suitable for the invention design method.
As shown in fig. 2, the grooved needle 1 includes a needle hook 11, a needle bar 12 and a stitch 13. The contour line optimization method optimizes the back contour region L1 and the groove contour region L2 of the grooved needle, the back contour curve of the grooved needle consists of more than one function curve, and the groove contour curve of the grooved needle consists of more than one function curve, namely, the contour line optimization is carried out on the part with more serious abrasion of the grooved needle.
The function curve is an equal acceleration curve, a simple harmonic curve, a cycloid curve, a modified trapezoidal curve, a modified sinusoidal curve, a modified constant velocity curve and the like. The method selects a modified sine curve to optimize the contour line of the grooved needle, the maximum value Vm of the dimensionless speed of the modified sine curve is 1.760, the maximum value Am of the dimensionless acceleration is +/-5.528, the maximum value Jm of the dimensionless jerk is +69.47, and the maximum value Qm of the dimensionless inertia moment is 5.458.
As shown in fig. 5, the contour curve of the needle back and the contour curve of the grooved needle are formed by sequentially connecting three curves, namely a first curve section 133, a second curve section 132 and a third curve section 131, and the third curve section 131 is closer to the needle tip.
A first curve segment:
a second curve segment:
a third curve segment:
wherein the content of the first and second substances,
T2＝1-T1，
S2＝1-S1。
as shown in fig. 3, the needle back profile curve has: from 2mm department from the needle point, optimize to the region that ends 5.29mm department apart from the needle point as the core, through being 0.16 with lift T, displacement distance S is 3.29 substitutes in the function curve, can obtain one section through the curve of optimizing, again with the both ends smooth transition respectively to the needle hook and needle bar position of this curve, through the optimization of appearance like this, just can make the acceleration change of coil in the process of knocking over reach the optimum, reduce the yarn and act on the positive pressure on the needle spare, reach and reduce the needle spare wearing and tearing, improve the effect in needle spare life-span.
As shown in fig. 4, in the needle groove profile curve: from the position 1.03mm from the needle point, optimize to the profile curve part that ends 4.17mm from the needle point, through 1.07 with lift T, displacement distance S is in the function curve for 3.14, with the both ends smooth transition to needle hook and needle bar position respectively of this curve again, just can make the coil reach the optimum at the acceleration change of knocking over the in-process, reduce the yarn and act on the positive pressure on the needle spare, reach and reduce the needle spare wearing and tearing, improve the effect of needle spare life-span.
Under the condition that the dynamic friction factor is not changed, the smaller the positive pressure is, the smaller the friction force acting on the needle is, the smaller the friction force is, the less the loss of the needle is caused, and the service life of the needle is prolonged.
Meanwhile, in order to reduce the friction coefficient of the surface of the needle piece, the traditional chromium plating process is optimized into the PVD processes such as DLC and tungsten carbide, the wear resistance of the needle piece is further improved, and the stability of the needle piece in the matching motion is improved. Meanwhile, due to the design of minimizing the acceleration change of the coil in the knocking-over process, the needle piece is more stable in movement, and the size of the coil formed after knocking-over is more stable, so that the faster machine running speed can be supported, and the product quality of the produced warp-knitted fabric is better. Meanwhile, the function curve is used for needle shape design and can also be applied to three-dimensional design, for example, a 4341 needle-shaped needle hook part is used for carrying out three-dimensional modeling optimization on the outline of the needle hook according to the working condition of the needle hook, the original identical section is optimized into the outline with a gradually changed section, and the strength of the needle hook is greatly improved on the premise that the size of a needle head is slightly increased.
The improvement of the dynamic performance caused by the new design is illustrated by taking the operating condition of the needle of the HKS-3SE device as an example:
it can be seen from the comparison result that the needle piece redesigned by the function curve has more reasonable speed change in the high-speed motion process, greatly improves the vibration condition of the acceleration, and reduces the maximum amplitude by 80 percent while reducing the change frequency of the acceleration. The jump motion condition is obviously improved, the maximum jump motion value is reduced by 95 percent while the jump motion quantity is obviously reduced, and the overall dynamic performance is obviously improved.
The service life change conditions of the traditional needle type and the optimized needle type through a function curve are that the single group of experimental control variable data:
| item | Data of |
| Laboratory machine type | HKS 2-SE warp knitting machine |
| Working width | 134 inch |
| Machine number | E36 |
| Number of CZ-43.41-G104 needles | 4824 pieces of Chinese herbal medicine |
| Number of ZX-C36-125 needles | 268 Block |
| CJP-C36 needle number | 268 Block |
Experiment-experimental factor data:
experiment two experimental factor data:
experiment three experimental factor data:
experiment four experimental factor data:
experimental data show that the service life of the needle shape optimized by using the function curve is obviously prolonged. After the needle type is optimized through the function curve, the running state of the machine is improved, and the product quality is improved. Meanwhile, the abrasion of the needle parts is reduced, the service life of the needle parts is prolonged, and the production efficiency and the economical efficiency are improved.
In addition, the needle core can be adaptively optimized for the optimization of the matched groove needle contour line.
The stylet 2 comprises a head 21, a transition portion 23 and a root 24, wherein the head 21 is connected with the root 24 through the transition portion 23.
As shown in fig. 6 and 7, after the grooved needle 1 is tightly matched with the needle core 2, the distance between the outer contour of the head 21 of the needle core and the needle head 11 of the grooved needle is increased from the traditional 0 to 0.05mm, so that the friction chance between the needle core and the grooved needle is reduced in the coil knocking-over process, the abrasion of the needle head 21 of the grooved needle and the needle core is reduced, and the service life of a needle piece is prolonged.
The needle core is always lower than the needle groove of the groove needle in the process of knocking over, so that a stress mutation point can be generated at the crossed position of the edge of the groove needle groove and the back of the needle core, the abrasion of a needle piece is accelerated, the looping stability is influenced, and the quality of the produced cloth cover is reduced. The invention optimizes the outer contour area 22 of the needle core head 21 from the joint of the needle core head 21 and the transition part 23 to the edge area of the groove needle groove, so that the outer contour of the groove needle groove edge is superposed with the outer contour 22 of the head 21, namely the thickness of the needle core is increased by about 0.1mm, and the effect of eliminating the stress catastrophe point in the process of knocking over is achieved.
As shown in fig. 8 and 9, the top of the transition part 23 is a straight inclined edge 231, and one end of the straight inclined edge 231 is connected to the position 5.62mm away from the needle tip of the head part 21. Change traditional circular arc limit 232 into the space that can utilize in the needle motion of the maximize utilization of straight line hypotenuse 231, promote the intensity support to nook closing member head 21, the yarn is in the atress in-process of knocking over like this, and the needle deflection can reduce, and the motion can be more level and smooth, and the wearing and tearing to the nook closing member can reduce.
As shown in fig. 5, the root portion 24 is fixed in the tin wax 25 block, the upper side 242 and the lower side 241 of the root portion 24 are parallel straight lines, the distance between the upper side 242 of the root portion 24 and the top surface of the tin wax 25 block is equal to the distance between the lower side 241 of the root portion 24 and the bottom surface of the tin wax 25 block, more flowing spaces are reserved for tin by designing the distances between the needle core root portion 24 and the two end surfaces of the tin wax 25 more evenly, the situation that the tin wax 25 is not fully cast is effectively reduced, the forming quality of the tin wax 25 is more stable, and the yield of the product production process is increased. The root 24 is provided with the elongated hole 243, the opening shape of the root 24 of the needle core in the tin wax 25 is changed, the circumference of the opening is increased from 4.0592mm to 6.3699mm, the length of the contact outer contour of the tin wax 25 and the needle chip is increased from 23.9477mm to 24.48295mm, and the bonding strength of the needle chip and the tin wax 25 is increased.
Claims (10)
1. A needle for a warp knitting machine, characterized in that: the profile curve of the moving wear region of the needle element consists of more than one function curve.
2. The needle member of a warp knitting machine according to claim 1, characterized in that: the needle piece comprises a grooved needle, and the needle back profile curve of the grooved needle and/or the needle groove profile curve of the grooved needle consist of more than one function curve.
3. A needle member for a warp knitting machine according to claim 1 or 2, characterized in that: the function curve is an equal acceleration curve, a simple harmonic curve, a cycloid curve, a modified trapezoidal curve, a modified sinusoidal curve or a modified constant velocity curve.
4. The needle member for a warp knitting machine according to claim 3, characterized in that: the function curve is a modified sine curve.
5. The needle member for a warp knitting machine according to claim 2, characterized in that: the needle back contour curve and the grooved needle contour curve are formed by sequentially connecting three sections of curves,
a first curve segment:
a second curve segment:
a third curve segment:
wherein the content of the first and second substances,
T2＝1-T1，
S2＝1-S1。
6. the needle member of a warp knitting machine according to claim 5, characterized in that: in the needle back profile curve: t is 0.16 and the displacement distance S is 3.29 from a position 1.8-2.2 mm away from the needle point to a position 5.0-5.5 mm away from the needle point.
7. The needle member of a warp knitting machine according to claim 5, characterized in that: in the needle groove profile curve: t is 1.07 and the displacement distance S is 3.14 from a position 1.0-1.1 mm away from the needle point to a position 4.0-4.3 mm away from the needle point.
8. The needle member of a warp knitting machine according to claim 1, characterized in that: the grooved needle model is 4341.
9. The needle member of a warp knitting machine according to claim 1, characterized in that: the surface of the groove pin is provided with a PVD coating.
10. The needle member of a warp knitting machine according to claim 9, characterized in that: the PVD coating is a DLC coating or a tungsten carbide coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110808914.0A CN113512815B (en) | 2021-07-16 | 2021-07-16 | Groove needle of warp knitting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110808914.0A CN113512815B (en) | 2021-07-16 | 2021-07-16 | Groove needle of warp knitting machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113512815A true CN113512815A (en) | 2021-10-19 |
| CN113512815B CN113512815B (en) | 2022-10-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110808914.0A Active CN113512815B (en) | 2021-07-16 | 2021-07-16 | Groove needle of warp knitting machine |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3828582A (en) * | 1971-08-28 | 1974-08-13 | Wildt Mellor Bromley Ltd | Improved knitting machine equipped with two part needles |
| DE2818711A1 (en) * | 1978-04-28 | 1979-11-08 | Needle Industries Ltd | Selectively strengthened latch needle - has shaft with structured cross=section to absorb forces and reduce breakage |
| US4584852A (en) * | 1983-07-16 | 1986-04-29 | Theodor Groz & Sohne | Compound needle for a knitting machine |
| US6389848B1 (en) * | 1999-05-19 | 2002-05-21 | Shima Seiki Mfg., Ltd. | Compound needle |
| US20040093910A1 (en) * | 2001-03-14 | 2004-05-20 | Ulrich Hofmann | Device for machine knitting |
| CN110184736A (en) * | 2018-02-23 | 2019-08-30 | 卡尔迈耶纺织机械制造有限公司 | Compound needle |
| CN111101288A (en) * | 2018-10-25 | 2020-05-05 | 卡尔迈耶研发有限公司 | Composite needle of warp knitting machine |
| CN112575441A (en) * | 2019-09-27 | 2021-03-30 | 卡尔迈耶斯托尔研发有限公司 | Knitting needle |
-
2021
- 2021-07-16 CN CN202110808914.0A patent/CN113512815B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3828582A (en) * | 1971-08-28 | 1974-08-13 | Wildt Mellor Bromley Ltd | Improved knitting machine equipped with two part needles |
| DE2818711A1 (en) * | 1978-04-28 | 1979-11-08 | Needle Industries Ltd | Selectively strengthened latch needle - has shaft with structured cross=section to absorb forces and reduce breakage |
| US4584852A (en) * | 1983-07-16 | 1986-04-29 | Theodor Groz & Sohne | Compound needle for a knitting machine |
| US6389848B1 (en) * | 1999-05-19 | 2002-05-21 | Shima Seiki Mfg., Ltd. | Compound needle |
| US20040093910A1 (en) * | 2001-03-14 | 2004-05-20 | Ulrich Hofmann | Device for machine knitting |
| CN110184736A (en) * | 2018-02-23 | 2019-08-30 | 卡尔迈耶纺织机械制造有限公司 | Compound needle |
| CN111101288A (en) * | 2018-10-25 | 2020-05-05 | 卡尔迈耶研发有限公司 | Composite needle of warp knitting machine |
| CN112575441A (en) * | 2019-09-27 | 2021-03-30 | 卡尔迈耶斯托尔研发有限公司 | Knitting needle |
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| Publication number | Publication date |
|---|---|
| CN113512815B (en) | 2022-10-18 |
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