The Contact Pressure Of Cylinder Yarn Tends To Be Intelligent.

In the winding process, the yarn contact pressure is one of the most important factors that affect the winding density of the bobbin and the anti stacking of the tube. The larger the pressure, the greater the winding density. As the winding diameter of the bobbin increases, the quality of the cheese increases correspondingly, and the pressure between the cheese and the grooved tube also increases. The winding density of the inner and outer yarn layers is different, and the overlap of the tube yarn is also aggravated. Therefore, Want to To control the yarn quality, it is necessary to control the contact pressure of cylinder yarn.

The automatic winding machine has been developed for more than 80 years. The main producers in the world are Italy, AUTO-CONER5, Germany, and Japan, and the Qingdao Hongda Textile Machinery Co., Ltd., and so on. The mainstream products include the No.21C, POLAR, and SMARO of Hongda Textile Machinery Co., Ltd. In the mainstream products of the 4 companies, the control methods of the yarn contact pressure are divided into two categories. One is the fixed value yarn pressure compensation, which is represented by Hongda Textile Machinery Co., Ltd. and the other company. The specific structure is as follows:

　　 Stability and reliability of pressure compensation for fixed value cylinder yarn

The contact pressure control mode of SMARO and POLAR cylinder yarns is basically the same. The fulcrum of the whole barrel yarn holding lift is in the rear part of the single spindle, lifting action and balance in the winding process, and is completed through a double cylinder. In the winding process, the balance is through the cylinder to give the support arm a certain thrust, counteracting the gravity effect of some supporting arms and the yarn, avoiding the influence on the yarn quality caused by the excessive contact pressure between the tube and the groove. This balancing force is achieved by adjusting the air pressure value on the head by adjusting the intake valve. This force is a fixed value and does not vary with the diameter of the cylinder yarns. The advantages of this structure are simple structure, good stability and reliability, simple and convenient maintenance, and low manufacturing cost. The drawback is that the unified adjustment of the compressed air pressure machine is a fixed value, which naturally causes the contact pressure of the yarn to become larger after the weight of the yarn increases. In addition, because the length of the whole machine is longer, the air pressure at the end of the engine head must be different, resulting in inconsistent contact pressure between the cylinder and the yarn, resulting in differences in yarn quality.

　　 Adjustable yarn pressure Compensated pressure constant

There are two ways to control the contact pressure of CAUTOCONER 5 yarn. One is to adopt the electromechanical cylinder yarn holding control system, and adopt stepper motor and two level gear set to control the pressure of the bobbin frame. The gear set is connected by a set of spring mechanism to the bobbin frame, and controls the contact pressure of the cylinder yarn by adjusting the torsion and torsion angle of the spring. Another way of control is called standard cylinder yarn contact pressure compensation device. The main principle of the standard cylinder yarn contact pressure compensation device is similar to that of the electromechanical type. According to the change of yarn yarn diameter, the yarn weight change is compensated, and the contact pressure of the yarn is compensated, so that the contact pressure of the cylinder yarn keeps basically constant. The device is composed of cylinder, spring and corresponding connecting rod. The yarn pressure is constant after mechanical manual adjustment, and each spindle must be adjusted separately. The regulation of Murata No.21C is similar to AUTOCONER5's second forms. The difference is that it controls the pressure of cylinder yarn by controlling the pressure of cylinder inlet, which is more accurate.

Although there are differences in the specific structure of the two kinds of yarn contact pressure control, the control principle is basically the same. The advantage is that the compensation value of the yarn contact pressure can be changed with the change of the yarn diameter, so that the contact pressure of the cylinder yarn can basically maintain a constant value and ensure the yarn quality. The drawback lies in the complex structure, easy failure, complex maintenance and high production cost.

With the continuous improvement of industrialization level, the requirement of yarn quality is getting higher and higher. At present, there are advantages and disadvantages of several kinds of main cylinder yarn contact pressure control structures, but on the whole, the precision control of cylinder yarn contact pressure is a development trend. With the progress of technology, the new cylinder yarn contact pressure control system will be more precise, more intelligent, and make the yarn quality continuously improve.