Weft insertion mechanism
The weft insertion of the air-jet loom uses compressed air as the weft insertion carrier, and uses the high-speed airflow generated when the compressed air is released through the small holes to pull the weft yarn through the shed to complete its weft insertion function. The quality of the weft insertion function largely determines the quality of the air-jet loom. Therefore, the weft insertion system is one of the keys to the air-jet loom. The early weft insertion system of air-jet looms used a porous nozzle to directly spray airflow into the shed for weft insertion. This weft insertion method has severe airflow diffusion, and the airflow speed drops quickly in the shed. The airflow on the exit side of the shed is turbulent and cannot effectively pull the weft yarn. The effective length of weft insertion is less than 1m, and weaving defects such as shrinkage and missing wefts are difficult to avoid. , and the air pressure required for weft insertion is high and the power consumption is large. In order to change the above-mentioned air flow state, pipeline jet weft insertion has been studied and developed. The duct piece effectively reduces the diffusion of air flow and increases the air flow speed at the exit side of the shed, providing favorable conditions for smooth weft insertion. Pipe sheet weft insertion significantly improves the quality of the cloth surface and makes the effective length of weft insertion reach more than 1m. The air pressure required for weft insertion is reduced and the power consumption is also reduced. Therefore, the application of pipe sheet weft insertion enables air-jet looms to be used to equip production workshops, becoming the earliest commercialized air-jet loom (Figure 2-2).
As can be seen from Figure 2-2, its advantage is that it consumes less air, can use ordinary reeds to beat up, and the cost of steel reeds is low. However, during beating-up, the pipe piece needs to be swung below the cloth fell, and the beat-up mechanism needs to adapt to the downward swing of the pipe piece, which is not conducive to high-speed operation. The friction between the pipe piece and the warp yarn requires high quality raw yarn and sizing, and the warp density of the fabric is also limited. The main and auxiliary nozzles relay weft insertion, and the special-shaped reed guides the air flow for weft insertion to overcome the above problems. Its continuous improvement has made the air-jet loom a high-speed, efficient, high-quality, wide-width, labor-saving and highly automated loom with development potential. The weft insertion system of the air-jet loom consists of air source purification, air pressure adjustment or air flow adjustment, air path, main and auxiliary nozzles, special-shaped reed, weft feeder, weft yarn supply creel, solenoid valve that controls the air flow switch of the main and auxiliary nozzles, etc. Device composition. The air delivery system of the air jet loom is that the compressed air from the air compressor reaches the air filter on the loom through the piping. The filtered air adjusts the pressure through the pressure regulating valve in the air pressure regulating box and is then distributed to the injection device. Each execution device.
Figure 2-3 shows the air delivery system of the ZA209i air-jet loom. The compressed air is transported into the loom, first passes through the filter to remove impurities, and then enters the air pressure regulating box. After branch pressure regulation, it is transported to the main air bag and auxiliary air bag, and then transmitted to the main nozzle through the switch solenoid valve of the air path. , auxiliary nozzle, shear nozzle, extension nozzle and up-blowing, extraction and holding device of weft yarn processing system. The compressed air required for the normal spray and weft feeder is directly supplied from the auxiliary air bag through the throttle valve, without the need for solenoid valve control. In addition to its gas storage function, the air bag also plays a voltage stabilizing role. The main air bag is used to store the compressed air for the main nozzle. When there are multiple colors, especially when the weft difference is large, each main nozzle corresponds to a main air bag. The auxiliary air bag is mainly used to store compressed air for the auxiliary nozzle. The air consumption of the auxiliary nozzle accounts for about 80% of the total air consumption (see Figure 2-4 for the air piping, and the names and functions of each part are shown in Table 2-2).
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