Why is a hole in the circular knitting machine debugging process? How to solve?

1纱线张力过大。纱线张力是由装配引起的。当机针压力（弯曲）恒定时，降低喂纱速度会增加纱线张力。此时，如果喂纱张力接近纱线的断裂强力，则会形成孔洞，但织造仍会继续。当张力增加时，不仅孔洞会增加，而且纱线也会突破编织。小区造成停车，俗称断纱。

2 机号和纱线不匹配固定注射器，使用的纱线粗细有限。面料过薄时，面料的形状不好；如果太厚，很容易造成孔洞。原因如图1所示。

当织针弯曲时，钩子将纱线拉入针槽或与相应的沉降片形成槽。此时，针与槽壁或沉降片之间的间隙L成为容纳纱线的空间。固定气缸的间隙是固定的。当纱线直径超过L时，被针钩拉动时，纱线会被挤压在针与针槽壁之间。很容易造成孔洞。如果纱线的断裂强力大，针也会被拉断。

3 g 质量太高。当纱线被织针弯成一圈时，它会从织针上脱下来，在下一个编织过程中被新钩住的纱线夹住。脱线时，织针的针在被成圈的纱线的作用下闭合，新钩的纱线被闭合在钩子中，成圈的纱线从钩子上脱离。当舌片闭合时，针部分的圆周长于舌片打开时针的其他部分的圆周，如图2所示。如果要顺利地从针中取出线圈，长度收针时线圈的周长必须大于或等于针的周长a，否则会被针折断而造成孔洞。这种现象在单面机器上很常见。考虑到编织过程中的线圈转移现象，实际最短线圈长度往往略小于a。以 28 针/25.4 毫米单面针织衫为例。针舌闭合时，最小线圈长度约为针头宽度的 2 倍。. 当然，如果使用类似丝绸的材料，由于强度高，弹性好，它的最短线圈长度比其他纱线短。在此讨论的针部脱离过程中缝线的膨胀是造成穿刺的原因之一。这并不意味着依靠这些分析来得出织物的最短针迹长度。针舌闭合时，最小线圈长度约为针头宽度的 2 倍。. 当然，如果使用类似丝绸的材料，由于强度高，弹性好，它的最短线圈长度比其他纱线短。在此讨论的针部脱离过程中缝线的膨胀是造成穿刺的原因之一。这并不意味着依靠这些分析来得出织物的最短针迹长度。针舌闭合时，最小线圈长度约为针头宽度的 2 倍。. 当然，如果使用类似丝绸的材料，由于强度高，弹性好，它的最短线圈长度比其他纱线短。在此讨论的针部脱离过程中缝线的膨胀是造成穿刺的原因之一。这并不意味着依靠这些分析来得出织物的最短针迹长度。

4 Position of the yarn guide When the yarn guide is installed too close to the Knitting Needle and its distance is less than the imported yarn diameter, the yarn will be squeezed between the yarn guide and the needle. Since the speed at which the needle eats the yarn is greater than the linear speed at which the cylinder operates, the tension between the extruded yarn and the bent point increases due to the pulling tension. Holes are easily formed. This type of phenomenon often occurs on the thread guard needle guard machine. Therefore, when installing the thread guide, special care must be taken not to get too close to the needle and to leave a certain gap. This clearance must be larger than the diameter of the imported yarn.

5 Position adjustment of the float triangle In the weaving process of some composite tissues, the most common one is cotton wool tissue. The needle is flat on the number of equal fixed paths, ie it does not participate in weaving, but at this time, these go flat. The stitches of the needles are still hung on the stitches. For machines where the float triangles can be adjusted in or out, pay special attention to the adjustment of the position of the float triangles. If the pressure is too deep, it is easy to break the coil hung in the hook; if the pressure is too shallow, it will cause the coil that is detached from the front path to not completely form the stylus. Inconsistent depth will cause the cloth to cross the strip. , especially on cotton wool fabrics. Therefore, special attention should be paid to the adjustment position of the float triangle when using a float triangle-adjustable machine.

6 The adjustment of the relative position of the dial of the double-sided Circular Knitting Machine and the triangular needle of the Needle Cylinder When weaving the ribbing structure, the position of the dial and the triangular needle of the needle is generally adjusted to the fully-fed position, that is, when the knitting needle of the needle cylinder completes the decoupling and begins to go flat. The dial needle begins to enter the dial mouth; or it is adjusted to the position for eating, that is, the needle of the needle of the needle of the needle and the needle of the needle of the needle and the needle at the same time. Do not adjust to the middle position, that is, when the needle of the needle cylinder is detached and rises to spit the yarn, the dial needle has already started to take off the yarn. Generally, the back needle angle of the knock-out portion of the rib needle cylinder triangle is about 40°. The pressure needle angle of the dial triangle is about 53°, that is, the speed at which the needle is returned from the needle is less than the speed at which the needle is needled. If the needle is needle-backed and the yarn is eaten by the dial needle, the tension of the yarn running between the nozzles will be large, and the probability of forming a hole will increase.

However, when eating, there was no relationship between giving and receiving each other because the needles and needles at the same time ate yarn. As long as the feed tension is controlled in a suitable range, there is generally no hole phenomenon, except that thick fabrics cannot be woven in this position. The reason is that when eating, the dial needle and the needle needle are simultaneously detached, that is, the knock-out coil is simultaneously stretched by the needle of the needle and the needle of the dial needle, and if the length of the thread is short, the hole will be broken. Then, when eating, because the knock-off process is separated, the needle is first detached from the cylinder, and the needle is detached after the needle has been completely detached from the needle, which effectively avoids the needle's advancement on the yarn at the same time of detachment. phenomenon. If you choose to eat and after eating the middle position, reduce the needle pressure of the dial triangle, you can avoid the yarn pulled in the mouth. However, if the needle of the dial triangle is turned down, the side effect is that the detachment is not complete, and it is easy to be broken by the needle when the next needle is pulled. At the same time, since the amount of bending of the yoke needle is too small and the coil formed is small, difficulties will occur when the needle is retracted in another way, so this solution is not desirable.

When weaving jacquard fabrics, due to the selection of needles, the frequency of out needles of the needles becomes irregular, and the needles of the needles are very regular. At this time, the relative positions of the dial and the needle cylinder must be adjusted to the position of eating, but not after eating, that is, the needle at the needle and the needle at the same time eat the yarn, and the lag in eating the yarn will change the running line of the yarn. Tortuous, the friction between the yarn and the needle increases, the internal stress increases, and a hole is formed. Some machines have different angles of needles and syringe needles, or the choice of needles and needles, causing them to leave each other at the same time. When the observation position is chosen to eat, the needle should reach the lowest point of the needle at the same time. .

Some cotton fabrics or tissues like cotton wool are less sensitive to the choice of relative positions of the dials and cylinders due to the small number of needles.

In the weaving of some composite fabrics, several yarn feeding speeds are often used, and the matching between these yarn feeding speeds is very important. If the matching is unreasonable, the cloth volume of each basic tissue woven under various speeds will be inconsistent. The cloth is fast, and some cloth is slow. At this time, most of the tension of the tensioning and pulling is exerted on the basic tissue which is slow in the lower cloth, and it is easy to pull the basic tissue to form a broken hole due to a large pulling tension. At the same time, the basic organization under the cloth will not be effectively hauled because of the lack of effective pull. Therefore, the coordination of the speed of yarn feeding between basic organizations must be reasonable.

7 Adjusting the depth of loops When weaving a looped fabric, special attention must be paid to the depth of the press stitch. Because the knitting needles perform the tuck knitting, the original yarn in the needle hook does not escape, but stays in the hook. If the tucking depth of the tuck exceeds the knuckle depth of the yarn staying in the hook, the yarn staying in the tacking hook will be broken by the tuck point of the tucking triangle to form a hole. In addition, in the double-sided fabric, when the sprocket needle is knitted at the same time as the needle of the needle, if a triangular positioning with a hysteresis loop is used, if the amount of the triangular camber of the dial and the triangular camber of the needle is not well matched, either the dial If the needle is too deep, the syringe needle is shallow, or the dial needle is too shallow and the needle is too deep, it will cause a hole because the yarn movement path is too meandering.

8 其他原因 除上述织造原因外，还有一些常见原因。例如缠舌、织针磨损过大、储纱带松动、布料张力过大、针槽过紧等，这里不再赘述。