Cotton thread rolling torsional vibration

The middle and rear rollers of the quilt production line, especially the tail of the large draft and large draft quilt production line, sometimes have torsional vibration. Grinder A spinning machine that turns fiber strands into rovings. The main function is to draft and twist, and to wind the roving into a certain package to meet the processing requirements of the spinning frame.

Carding machines are used to process cotton fibers and chemical fibers and belong to textile machinery. According to the spinning process, carding is an important process. The front process of the carding machine is the opening and cleaning machine, and the latter process is the drawing frame (carding process) or the sliver coiler (combing process).

The structure of the double twisting unit of the double twisting machine mainly includes the spindle braking device, the spindle part of the double twisting machine, the yarn winding device, and the special device of the double twisting unit. This speed change results in torsional vibration unevenness and reduced yarn strength. This phenomenon is related to roll diameter, overall roll length, roll speed, roll pressure, bearing type and lubrication conditions.

The torsional vibrating roller motion is generated, in fact, the constant velocity rotational motion of the quilt normal roller and the reciprocating motion superimposes the vibrating button. After the torsional vibration of the roller is generated, the amplitude gradually disappears or the continuous vibration is reduced based on the conditions to be damped. If then from a positive value, the interconversion energy potential function will disappear and gradually shrink, and the torsional vibration will also disappear. If the damping is negative, when the energy increases, the amplitude will also increase.

When the positive and negative damping are balanced, some packets will be torsional vibration in amplitude and frequency continuously. When the roller of the quilt production line reverses this vibration, the relative development speed of each section changes, but because the rotation speed of the roller is generally greater than the absolute growth rate of the vibration generated by the torsion of the enterprise, the roller-to-roller bearing can contact the society. The direction of the slippery motion is always a constant, so the direction of the friction force F is also unchanged (opposite to the direction of the roller car motion), but the impact of the relative speed is not exactly the same. Assume that the linear speed of the Roller Company during normal use and rotation is v (constant value), and the surface linear speed of the roller during torsional vibration in the environment is ±u (variable value), as shown in Figure 3-7 (b).

When the direction of the torsional vibration of the roller is the same as the direction of the rotation of the roller, the relative improvement speed of the ability of the palm rushing surface is v + u. When the direction of the torsional vibration of the roller is opposite to the direction of the rotation of the roller, the relatively high speed of the friction window is V-u. Under the dry friction economy condition, the friction correlation coefficient is related to the relative stable speed control of the content of the friction aspect, and the friction risk coefficient analysis decreases with the increase of the speed relative to the time. Therefore, when the direction of the torsional vibration of the roller is the same as the direction of the rotation of the roller, the average value (FI) of the friction force F acting on the roller is reduced, and when the direction of the torsional vibration of the roller is opposite to the direction of the rotation of the roller, it acts on the roller. The average value of friction force F (F1) on the roller is increased. When F. acts, the signal energy is input from the front of the car and accumulates as elastic energy. When FI acts, the elastic energy is required to be released and converted into industrial kinetic energy and friction materials. loss.

Because of F. serrata, the power input needs to be more than enough energy level, so that the vibration energy can be maintained without decay. The rollers cause torsional vibrations, which are self-excited vibrations due to the varying frictional forces of the vibrating system itself. There are many factors that affect the torsional vibration of the roller.

However, some important factors such as roller diameter, pressure, draft ratio, roller speed, etc. are all specified by the spinning technology. In the mechanical design, these social factors are usually not changed by the enterprise. In order to avoid the occurrence of torsional vibration of the roller, our teachers can consider the friction between the main economic factors that cause the self-excited vibration of the roller company, improve the working conditions of lubrication and transform the bearing type in China, for example, the students use rolling bearings, that is effective measures.

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