CN104389052A - Variable-compression slip draft mechanism for spinning - Google Patents

Abstract

The invention discloses a variable pressure slippery drafting mechanism for spinning, which comprises: a series of rollers arranged sequentially from the front of the machine to the rear of the machine, usually three to four groups, and cooperating top rollers are arranged above the rollers. The stretching mechanism adopts a spring pressure device and the pressure of each top roller is independently adjustable. The second top roller compression spring from the front of the machine to the rear of the machine is equipped with various specifications, and the other compression springs have the same specifications. The pressure generated by the second top roller compression spring is different. Greater than the rest of the top roller pressure. According to the length distribution of different fiber raw materials, the present invention configures the spring specifications of the second top roller, adjusts the pressure applied to the roller by the second top roller, forms a slippery drafting effect, and improves the stress on the fiber in the strand during the drafting process condition, so that the ultra-long fibers can be well controlled without being strictly held, which effectively reduces the phenomenon that the fibers are broken when the fiber length is greater than the holding distance of the rollers, and improves the quality of the sliver.

Description

A variable pressure slippery drafting mechanism for spinning

technical field

The invention relates to the field of textile machinery, in particular to a variable pressure slippery drafting mechanism.

Background technique

In textile production, in order to ensure the uniformity of the strands, the gripping distance of the rollers in the drafting zone is usually determined according to the quality length of the fiber raw material, and the gripping distance is required to be slightly larger than the quality length of the fiber. However, when the length uniformity of the raw material is poor, the length of some ultra-long fibers in the strands will be greater than the roller gauge, and when they are held by both ends of the rollers at the same time, these ultra-long fibers will be broken, causing the fibers in the strands to be broken. The quality and length of the yarn is reduced, and the resulting short fibers will further aggravate the deterioration of the evenness and affect the final yarn quality. In order to solve this problem, it is generally adopted to adjust the drafting mechanism to slippery drafting. Domestic patent CN201210065856.8 is the application of slippery drafting on the draw frame. Domestic patent CN 201210018356.9 is the application of slippery drafting on the roving frame. CN 201010536161.4 is the application of slippery drafting on spinning frame, and above-mentioned three patents all adopt the technical scheme that leaves certain width deep groove to realize slippery drafting at top roller. Due to the limitation of the size of the groove, this solution is suitable for a single type of spinning fiber and has poor versatility.

Contents of the invention

The purpose of the present invention is to solve the problem that fiber strands with poor length uniformity are easily broken during the drawing process, resulting in a decrease in fiber quality and length, and a decrease in sliver quality. , easy to use, suitable for a wide variety of spinning fibers, good versatility and a variable pressure slippery drafting mechanism.

In order to achieve the above object, the present invention adopts the following technical solutions:

A variable pressure slippery drafting mechanism for spinning, comprising: a series of rollers arranged sequentially from the front of the machine to the rear of the machine, usually three to four groups, with cooperating top rollers arranged above the rollers, the drafting mechanism adopts The spring pressure device and the pressure of each top roller are independently adjustable. The second top roller pressure spring from the front of the machine to the rear of the machine is equipped with various specifications, and the other top roller pressure springs have the same specifications. The pressure spring of the second top roller can be configured according to the friction performance, strength, and length distribution of the fiber material, and the pressure generated is not greater than that of the other top rollers to achieve the effect of slippery drafting. The pressure configuration between the top rollers is relatively close It is suitable for the condition of good fiber length uniformity, and the relatively disparate pressure configuration between top rollers is suitable for the situation of poor fiber length uniformity.

The invention has a reasonable structural design, and by adjusting the pressure of the pressure spring used by the second top roller, the effect of slippery drafting is realized, and the stress condition of the fibers in the strands during the drafting process is improved, so that the ultra-long fibers can be well controlled. It is not strictly held, which effectively reduces the phenomenon that the fiber is broken when the fiber length is greater than the holding distance of the roller, and improves the product quality. The drafting mechanism can be widely used in drawing frames, roving frames, ring spinning frames, air-jet vortex spinning machines and fancy twisters with drafting mechanisms in cotton spinning, wool spinning, silk spinning and other industries.

Detailed ways

Provide three specific embodiments of a kind of variable pressurization slippery drafting mechanism for spinning of the present invention below, these embodiments are only illustrations to the present invention, do not constitute the restriction to the claims of the present invention, the present invention does not describe apply to existing technologies.

Example 1

The semi-worsted process is used to process wool/acrylic (50/50) blended yarn, the nominal length of acrylic fiber is 38mm, the nominal linear density is 1.67dtex, the wool is 60, and the drawing frame adopts this variable pressurized slippery drafting mechanism , including: four sets of rollers arranged sequentially from the front of the machine to the rear of the machine, and cooperating top rollers are respectively arranged above the rollers. The pressure springs used for the front, third and rear top rollers have the same specifications, all of which are YB 3.5×18×48GB/T 2089, the second top roller compression spring specification is YB 1.6×16×48GB/T 2089, the front, middle and rear grip distance configuration is 42mm×42mm×65mm, and the pressure configuration of the first to fourth top rollers is 350N×50N×350N× 350N.

During the drafting process, the blended strands are fed into the drafting zone from the rear nip, and the blended strands are gradually thinned as the speeds of the rear roller, the third roller, the second roller and the front roller increase in sequence. Due to the large difference in the length of the blended fibers, when the short fibers move out of the drafting zone, part of the long fiber tails are still in the nip of the second top roller roller. At this time, because the pressure on the second top roller pair is very low, its The fibers are not held tightly, making the long fibers slippery in their jaws, resulting in a slippery draft and improving the quality of the sliver.

Example 2

Purely spun yak velvet yarn, the drawing frame adopts this variable pressurized slippery drafting mechanism, including: four sets of rollers arranged in sequence from the front of the machine to the rear of the machine, and cooperating top rollers are respectively arranged above the rollers, and the front, third and rear The compression springs used for the top rollers have the same specifications, both are YB 3.5×18×48GB/T 2089, the specifications of the compression springs for the second top roller are YB 1.6×16×48GB/T 2089, and the front, middle and rear grip distances are configured as 42mm× 42mm×52mm, the pressure of one to four top rollers is configured as 350N×50N×350N×350N.

During the drafting process, the yak velvet strips are fed into the drafting area from the rear nip, and the yak velvet strips are gradually thinned due to the sequentially increasing speeds of the rear roller, the third roller, the second roller and the front roller. Due to the large difference in length of yak cashmere fibers, when the short yak cashmere fibers move out of the drafting zone, part of the long fiber tails are still in the nip of the second top roller roller. At this time, due to the extremely low pressure on the second top roller roller, its The long fiber of yak hair is not strictly held, so that the long fiber is slippery in its jaws, resulting in slippery drafting, which improves the stress of the yak hair fiber during the drafting process, and effectively reduces the occurrence of ultra-long fiber breakage , Improved the quality of the sliver.

Example 3

For carding pure cotton polyester yarn, the drawing frame adopts this variable pressurized slippery drafting mechanism, which includes: four sets of rollers arranged in sequence from the front of the machine to the rear of the machine, and cooperating top rollers are respectively arranged above the rollers. 2. The pressure springs used for the third and rear top rollers have the same specifications, both are YB 3.5×18×48GB/T2089, the front, middle and rear grip distances are configured as 42mm×42mm×52mm, and the pressure of the first to fourth top rollers is configured as 350N ×300N×350N×350N.

During the drafting process, the polyester fiber strands are fed into the drafting zone from the rear nip, and the polyester fiber strands are gradually thinned due to the successively increasing speeds from the rear roller, the third roller, the second roller and the front roller. Because the cotton-type polyester fiber length is uniform and the fiber speed change points are relatively concentrated, at this time, the pressure on the second top roller is close to that of the rest, and the drafting mechanism is used as an ordinary cotton-type draw frame.

Claims (6)

1. A variable pressurization slippery drafting mechanism for spinning, comprising: a series of rollers arranged successively from the front of the machine to the rear of the machine, usually three to four groups, top rollers are provided with cooperating top rollers, the drafting The mechanism adopts a spring pressure device and the pressure of each top roller is independently adjustable. The second top roller pressure spring from the front of the machine to the rear of the machine is equipped with various specifications, and the other compression springs have the same specifications. The pressure generated by the second top roller pressure spring is not greater than The rest of the top roller pressure. 2. The variable pressurized slippery drafting mechanism for spinning according to claim 1, characterized in that: the drafting mechanism adopts a spring pressure device and the pressure of each top roller is independently adjustable. 3. The variable pressurized slippery drafting mechanism for spinning according to claim 1, characterized in that: the compression spring used by the second top roller of the drafting mechanism from the front to the rear of the machine is equipped with various specifications , can be configured according to the friction performance, strength, and length distribution of the fiber raw materials. Among them, the relatively close pressure configuration between the top rollers is suitable for the fiber length uniformity, and the relatively disparate pressure configuration between the top rollers is suitable for the fiber length uniformity. worse case. 4. The variable pressurized slippery drafting mechanism for spinning according to claim 1, characterized in that the pressure generated by the pressure spring selected from the front to the rear of the drafting mechanism for the second top roller is not greater than that of the rest of the top rollers. Roller pressure to achieve slippery drafting effect. 5. The variable pressurized slippery drafting mechanism for spinning according to claim 1, characterized in that: the top rollers of the drafting mechanism are ordinary top rollers wrapped with nitrile rubber, without processing grooves. 6. The variable pressurized slippery drafting mechanism for spinning according to claim 1, characterized in that: the drafting mechanism can be popularized and applied to drawing frames, roving frames, Machinery such as ring spinning frame, air-jet vortex spinning frame and fancy twisting machine with drafting mechanism.