New Process: Control And Utilization Of Process Airflow In Various Processes Of Cotton Spinning

The control and utilization methods of process airflow in cotton spinning process are discussed. The characteristics of each process airflow in cotton spinning engineering are introduced. The control and application of process airflow in each process are analyzed in detail, and corresponding control methods are put forward. It is believed that by using the rules and characteristics of technological airflow and guiding airflow, we can reduce labor intensity, improve air environment, stabilize and improve product quality.

In the cotton spinning process, many processes such as the operation of the equipment, the suction of the fan, the control of the dust removal unit, and so on, flow in the production workshop, which has a certain effect on the air conditioning in the workshop, causing local temperature and humidity to vary in varying degrees, affecting the quality of products and air conditioning. Strengthening the control and utilization of process airflow plays a positive role in adjusting air quality, improving product quality, reducing labor intensity and improving production environment.

Characteristics and influence of airflow in cotton spinning process

Characteristics and influence of airflow in cotton spinning process

Characteristics of process airflow

The cotton spinning process airflow is the airflow generated by the operation of the cotton spinning equipment and the suction of the fan, which is the airflow necessary for the equipment to complete the process. The main features are: the process air flow is accompanied by the technological process, and the process airflow has certain temperature and dust. The size of the process air flow depends on the air volume and velocity of the equipment, and there are directional and non directional points.

Influence of technological airflow

Air flow in cotton spinning process penetrates all aspects of the production process, and there is a positive side to the airflow, and there are also disadvantages. In terms of quality, the smoothness of process airflow affects the movement of air. The positive and negative pressure affects the impurity removal of cotton spinning engineering. In the environment, the free flow of technological airflow affects the adjustment of temperature and humidity in the workshop, resulting in the difference of temperature and humidity.

Classification of cotton spinning process airflow

Air flow in cotton spinning process is mainly caused by equipment running resistance airflow and fan suction. The former belongs to the range of air flow, and the latter is air pressure airflow. The running process of the equipment is dispersed and has a certain direction. The airflow velocity is relatively low, but the running equipment is large, the influence surface is wide, and the reusing value is small. Positive and negative pressure operation of the process airflow has a certain distribution pipeline, directional concentration, high speed, and heat dissipation by the fan has a certain amount of heat, recycling value is higher.

Utilization and control of airflow in cotton spinning process

Opening and cleaning process airflow

Process airflow of cotton picker

The suction of the cotton picker and the cotton spinning machine will produce process airflow and mix with each other. Its function is to grab cotton blocks, but it will also affect the effect of grasping. When the wind is weak, it is easy to bring back flowers, form bundles and neps, and increase energy consumption too. According to the hardness and material types of grabbing cotton blocks, proper wind speed can be used to achieve both energy consumption and stable quality.

Process airflow of cotton conveying pipeline

The air flow of the cotton conveying pipeline belongs to the positive and negative pressure operation process airflow, which has a certain directivity, mainly conveying cotton blocks or dust impurities. The wind speed determines the weight and volume of the pipe and the effect of transportation. The pipe diameter determines the flow rate. When the flow rate is low, the cotton blocks are easy to stay in the pipeline and affect the mixing. Therefore, the wind speed should be set reasonably according to the size and volume of the load, so as to stabilize the air transportation.

The air flow in the conveying pipeline has a constant speed. With the relatively closed characteristics, it can increase the weight and impurity collector and make the impurities or heavier objects fall, providing a good guarantee for quality and safety. Its schematic diagram is shown in Figure 1.

As shown in Figure 1, A is imported, B is exported, and C is falling dust. When the air flow enters the C from A, the velocity of the diffusion decreases, and the weight is separated from the C dust with inertia and output from the B, and the weight is reduced.

Process flow of coagulating machine

The airflow of the coagulating machine is a pneumatic suction positive negative pressure process air stream. Its main function is to pump cotton flow and remove short fiber. The strength of the air flow determines the speed of the fiber bundle transportation. At the same time, it is rubbed with the fibers, and the residence time is long. According to the distance and volume of the fiber, the wind speed and pipe diameter should be matched to stabilize the ratio of cotton to gas and ensure the transportation of fibers. In positive pressure operation, as the power of the dust collecting unit, the dust can be separated at the first level, and the clean air at the two stage can save energy and reduce power consumption.

Mixing airflow process

The airflow of mixed cotton machine belongs to the negative pressure running air flow, which is the process air flow generated by the fan suction of the pre spinning equipment, and the main function is to convey the cotton block. The strong and weak air flow has great influence on the transportation of cotton blocks. Because the airflow of mixed cotton machine is mostly vertical pipes, the corners are mostly right angles, which affect wind speed and air volume. Therefore, the bending radii of the elbow should be 2 times the diameter of the pipe when designing, and avoid the right angle turn, reduce the running resistance and reduce the energy consumption. Mixing cotton opener is a more complete process of loosening. It is the best time to separate dust from impurities. The addition of U shaped drop device at its outlet can separate impurities from fibers.

Process flow of multi bunker mixer

The process airflow of multi compartment mixer is a dynamic suction flow, and its action is to transport cotton flow and blend fiber. The airflow is stable, and the pressure range is positively related to the density of the cotton layer. The instability of airflow can easily affect the density of cotton layer and the mixing of fibers. The airflow demands constant in a certain range, so that the speed of motion is uniform, and the effect of fiber mixing is ensured. The process air flow is divided into output and input airflow. The process airflow during input is positive pressure rushing out, and the fiber jet disperses; when the output is, the process airflow is the process flow of the cotton coagulant, and the free falling point can be added by the motion characteristics of the air flow.

Process airflow of winding machine

The mechanical suction rotary air flow is the characteristic of the process airflow of the winding machine. It belongs to the negative pressure air flow, mainly condensing cotton layer and conveying fiber. The synthetic swivel will produce process airflow, and its swivel speed has great influence on the dropping. The influence of process airflow on coagulator quality and effect is obvious.

Combined with the influence of the speed of the driver, the speed of the air flow should be selected according to the fiber strength. The process airflow of the winder should be stable and unobstructed, especially the turning point of the draught fan of the winding machine, so as to reduce the resistance of the pipeline and ensure the smooth flow of the air. The airflow of the synthetic Kok can be divided into dead boxes and live boxes by using the principle of the falling layer of the boundary layer, so that the collecting fibers and the falling impurities can be separated from each other, and the dust absorption can be reduced. This is shown in Figure 2.

The living box mainly collects impurities and dead boxes to recover fibers, reducing dust adsorption to cotton layer and affecting impurity removal effect. The airflow in the down row is the key to the coagulating device, and its distribution depends on the movement state of the airflow. The transverse width and vertical length of the cotton roll affect its weight by CV. According to the movement rule of the air flow, according to the processing property of the fiber, it can be adjusted, so that the dust cage condensation can reduce the lamination phenomenon of the cotton roll, and can be closed laterally from the ends of the cage, so as to reduce the width of the cotton roll and reduce the weight of the cotton roll CV.

Process airflow of carding machine

Process airflow of carding machine

The technology of air entrant is a kind of airflow generated by high speed rotation. The main function is to hold fibers to separate impurities. The strength of the airflow affects the loosening, impurity removal and fiber transfer ability of the roller. The location of the dust removal cutter, the first falling zone and the second falling zone should be set reasonably, so as to ensure the separation and recovery of fiber function. By using the principle of air separation and speed change and pressure impact, the inlet gap of the small leakage can be increased by 2mm to 3mm, so that the airflow entering the small leakage bottom will increase, and the phenomenon of small leakage will be reduced.

Cylinder air flow

The process air flow of cylinder is a process airflow generated by high speed rotary, mainly supporting fiber, providing output transfer capability. Xilin is the key equipment for carding fibers. The air stream is continuously replenished and released at the same time, so as to reduce the high pressure in the carding area and smooth the fibers after carding. The carding and transferring pressure of carding area and doffer can be reduced by adding cotton net cleaner and pre combing plate before and after carding, so as to improve the quality of cotton sliver.

Guide bar rotary flow

The air flow of the guide bar is the air flow caused by the drag of the guide bar by the sliver and the air generated by the resistance of the air. By using the principle of rotation, the wind drag device can be installed on the guide wheel to produce self cleaning effect and reduce the agglomeration of short fibers.

Combing machine process airflow

Combing machine bellows removal process airflow

The air exhaust process of comber is completed by suction of the fan. Airflow input is equal to output is the normal state of motion, but when there is imbalance between them, positive pressure or negative pressure deviation will appear. The influence of air flow on dust adsorption and the collection of short fiber is also affected by the discharge of airflow, which has a certain temperature and affects the local temperature of the workshop. The exhaust air should be inhaled as far as possible to reduce the detention in the workshop. Comber discharge air flow has a certain wind speed. When the humidity of workshop is fluctuating, humidifying at the outlet of the wind can balance the temperature of the workshop.

Combing machine collection box process airflow

The process airflow of the combing machine collecting box is a fan suction negative pressure airflow, which generates negative pressure to transmit to the dust collecting roller, adsors the short pile and dust produced by the brush, and purify the air at the same time. If the airflow is unstable, the adsorption capacity of dust and short fiber will not be strong, which will cause uneven cotton net. A suction port with a diameter of 60mm is produced at the collecting box, and a funnel is machined in the rear area of the draft roller. It can make the short pressure down in the draft area and reduce the cleaning strength and flying attachment of the lint board to ensure the quality of the product.

Process airflow of drawing frame

The process airflow of drawing frame belongs to the suction negative pressure process air flow, which mainly absorbs the flying flowers and short lint from the drawing area, reduces the yarn faults and reduces the labor intensity. If the airflow is not smooth or the suction pressure is not enough, it is easy to create draft flowers and produce yarn faults. The upper shell of the drawing area of the drawing frame is relatively closed. When the suction fan is sucked, there must be a corresponding air supplement. If the wind is disordered or the wind is insufficient, it is easy to cause the fibers to draw the draft area from the draft. The process air flow from the side door of the drawing frame affects the local temperature of the workshop, and it also easily blew away the semi finished products. Generally, when drains are designed in the trench, the discharge of the airflow outside the machine should be eliminated down to reduce the difference between the detention time and the local temperature in the workshop.

Process airflow of roving frame

Generally speaking, the process air flow of roving frame belongs to the process of positive and negative pressure running on the new high speed roving frame. It mainly draws the short fiber from the drafting area and purify the workshop environment. Discharge in the workshop will also cause fluctuations in the production environment. Therefore, the outlet of the outlet should be blown downwards, and the draught should be quickly guided when drained. When the process air flows directly into the workshop, it can also make up for the lack of humidity in spring and autumn according to the characteristics of the emission and the local humidification. The water can be drained outside the tuyere, and humidified by air flow.

Spinning process airflow

Process flow of spinning tail

There are two kinds of technological airflow at the tail of spinning frame: the external exhaust flow of the suction fan and the high-speed swivel airflow of the motor, respectively. Collection of fiber airflow must be smooth, to ensure negative pressure suction mouth, while ensuring timely heat dissipation, control the temperature of the motor in a reasonable range. In general, collective extraction is used for winter return, and summer drainage reduces the temperature in the workshop. According to the season of low temperature and partial temperature difference in winter workshop, the process wind can be directly discharged into the workshop to ensure the heating and energy consumption of the workshop in winter.

Process flow of bodywork

The rolling process air flow is a process airflow generated by the breakthrough resistance of the equipment, which has a certain directional property and a weak wind speed. Generally running at low altitude, affecting the cleanliness of the workshop. It is possible to set up a low volume air duct at the bottom of the spinning frame, and reduce the impact on the workshop by combining the upper and lower rows of the air supply organization.

Winding process airflow

The winding process air flow is a high negative pressure air flow generated by fan suction, which mainly completes the suction of yarn. Airflow must reach a certain negative pressure, otherwise it will affect the production efficiency. Generally, the upper and lower limits are set at frequencies of 45Hz to 50Hz, and the relative pressure is guaranteed to be above -6000Pa. The airflow is generally discharged out of the outdoor area, and can be discharged into the room in winter to raise indoor temperature and save energy and reduce consumption.

Process airflow of dust removal unit

The process airflow of the dust removal unit belongs to the negative pressure generated by the extraction of the fan. After the purification of the air, the exhaust air is used to separate and purify the air and dust, reduce the pollution in the workshop, and complete the collection and transportation of the fibers and dust. The stability of the airflow in the dust removal process affects the dust removal effect and the production environment. The general design is connected with the air conditioning room, and is discharged into the air-conditioned room for water spraying and purification, and the return air is utilized. In winter, local temperature in some workshops is low, such as cotton cleaning and carding processes with fewer machines, direct reusing workshop can be adopted to achieve energy saving and consumption reduction.

epilogue

Cotton spinning process airflow is the airflow generated by equipment operation and fan extraction in cotton spinning process. In the production process, process airflow plays a very important role in quality stability, transportation and separation of cotton flow and separation and purification of fiber dust. Process airflow has both positive and negative side effects. The practice shows that the process airflow can be effectively controlled by means of the movement rule of air flow and the characteristics of airflow type and the need of process environment, so as to achieve the goal of energy saving and consumption reduction.