In order to be able to eliminate yarn defects, we have always used traditional mechanical yarn clearers in the textile mill cards. During the spinning process of the spinning frame, the semi-finished roving or sliver is drafted, twisted, and wound into a spinning machine. The combed sliver and the needle-carding machine combine the sliver, the needle row is drafted to improve the sliver structure, and the roving is further spun into spun yarn on the ring spinning frame, which is the main spinning machine. 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 mechanical yarn remover is composed of metal blades and comb needles. It has low cost, simple structure, long service life, can remove some impurities and yarn defects, and improve the quality of yarn products.
With the development of social production, the post-process large package and high-speed production have put forward a higher requirement for the quality of yarn money. The performance of mechanical yarn clearer to remove yarn defects can no longer meet the requirements of this technical process design, so The main electronic yarn clearer for carding machines began to appear. (1) According to the method of detecting yarn defects, electronic yarn clearing can be divided into photoelectric yarn clearing and capacitive yarn clearing. The photoelectric yarn clearer uses the image of photoelectric detection of yarn defects (defects) to detect yarn defects, which is close to visual proximity, and the detection signal has nothing to do with fiber type and moisture regain.
Capacitive electronic pickups are used for indirect detection of yarn quality. The signal is related to fiber type and moisture regain. It's a cut flat line that's not easy to miss.
The electronic yarn clearer of the carding machine is generally composed of four important parts: the detection head, the amplifier, the junction box, and the power system control box. (2) Photoelectric electronic yarn clearing 1. The photoelectric detection system composed of yarn usually includes three light sources, optical devices, and a photoelectric receiver. 2, the basic principle of work.
As shown in Figure 6-1, the light emitted by the light source (incandescent lamp, infrared light-emitting tube) can illuminate the photoelectric information receiver (photoelectric cell, photosensitive control diode, etc.) through an optical system device. These beams), especially the electric receiver sense. The image of the variation in yarn thickness produces small changes in the telecommunication number. The signal amplified by the amplifier is used to identify the roughness and length of yarn defects, and to identify double yarns.
When the number of signals exceeds the set value bend (ie yarn defect), the identification circuit is triggered. The cutting mechanism cuts the yarn. In order to achieve the purpose of removing yarn defects.
(Capacitive electronic yarn clearer 1, the yarn is composed of the capacitive detection system is composed of two metal rods which form an air electrode capacitor. 2. Basic working principle: As shown in Figure 6-2, the yarn clearer detection head There is a high-frequency oscillator inside. When the yarns pass through to detect the capacitance of the system, the different changes in the thickness of the yarns can cause changes in the output control signal (amplitude) of a capacitive sensor. Amplify the electrical signal, the signal after amplifying itself is identified by the discriminator, if it exceeds the set value (that is, it is judged as a yarn defect), the shearing mechanism will be triggered and the yarn will be cut. (d) Mechanical slub yarn and electronic yarn clearing ratio The school is clearer: mechanical advantages: (1) the yarn clearer is composed of metal blades or combs, the structure is simple, the cost is low, the maintenance and repair management are convenient, (2) the influence of temperature mixing changes is small, (3) Impurity removal effect is better.
Disadvantages: (1) It is easy to damage the fiber. Shaving yarn, after improving the technical requirements, will carry out a lot of research into cotton yarn fibers to float, increase hairiness, (2) the dust is easy to increase damage; (3) plain yarn or elastic yarn defects are easy to be missed, (4) yarn The burning length of the thread cannot be controlled; (5) the yarn is rented and taken without clear details; (6) it is more difficult to adjust the yarn clearing process; (7) it cannot be used as a monitoring and signal sending unit:.