With the increasingly fierce competition in the textile market, the use of air-jet loom
s to reduce the cost of weaving and reduce energy consumption has become a new and important topic. The energy consumption of jet loom is mainly based on gas consumption, which can be divided into three parts: the energy dissipation of the gas supply system, the energy consumption of the gas system and other auxiliary energy consumption, especially the previous two gas consumption.
The energy consumption of jet loom is mainly based on its gas consumption, which accounts for about 72% of its energy consumption, while the gas consumption is mainly about 80% or more. Lower air-jet loom gas is mainly from lower consumption of auxiliary nozzle, gas consumption and take comprehensive measures in the system, from the auxiliary nozzle pressure, auxiliary nozzle spacing, electromagnetic valve to control the number of auxiliary nozzle, gas storage configuration, the choice of auxiliary nozzle groove, the adjustment of injection Angle, injection to the comprehensive consideration, of which the reasonable and energy-saving of auxiliary nozzle pressure the choice of auxiliary nozzle is especially significant effect on reducing gas consumption.
1.Minimize the auxiliary nozzle pressure
Practice shows that the whole machine flow and the main nozzle pressure, auxiliary nozzle has the following relationship: when the main nozzle at constant pressure, auxiliary nozzle pressure increase 0.1 million mpa, the whole machine when rose by an average of 7.06 cubic meters/flow; In addition, the main nozzle pressure increases by 0.1mb, and the total flow rate of the total machine increases by 1.3 cubic meters per hour, which is equivalent to 18.4% of the increased flow rate of the auxiliary nozzle. And main nozzle pressure increase 0.05 million mpa, can make the Angle of weft reached an average of 4.43 degrees, or main nozzle pressure increase 0.1 million mpa, can make the weft arrival Angle by an average of 8.86 degrees, auxiliary nozzle pressure increase 0.1 million mpa, can only make the weft arrival Angle by an average of 2.5 degrees. Therefore, in a certain range of main and auxiliary nozzle pressure, increasing the auxiliary nozzle pressure, need to increase a lot of gas consumption, but for reducing weft arrival Angle to improve the effect of weft flying speed are less.
Therefore, in the absence of weft, it is possible to minimize the pressure of the auxiliary nozzle to reduce the gas consumption and reduce the breakage of the weft.
2.The solenoid valve shall be matched with the number of auxiliary nozzle
The average 90 cm jet loom has 24 to 36 auxiliary nozzles, and each auxiliary nozzle in the weft channel is between 70 and 80mm. With 4 ~ 6 auxiliary nozzle configuration one solenoid valve, 4 ~ 6 auxiliary nozzle switch time is at the same time, this control method makes each group except the first nozzle of auxiliary nozzle are the rest of the advance Angle of nozzle are large, makes the filling head after the second has not yet arrived and auxiliary nozzle air vent. If two auxiliary nozzle configuration a solenoid valve, only two auxiliary nozzle switching time is the same, although increased the number of solenoid valve, but reduce the injection time, this will create conditions to save gas consumption. It should also consider the accuracy of the solenoid valve, which will be better if it reaches 1 millisecond. According to the manufacturer, this new technology can save 10% ~ 15% of gas consumption.
3. Reasonable configuration of storage tanks
The air pressure tank assembled on the jet loom can cause airflow expansion from the air compressor room through the pipe to the loom, and has the effect of stabilizing pressure. Because of air resistance in the pipe and tube wall will produce friction, especially when air pressure is higher, thereby reducing the friction loss can also achieve a certain throttle effect, usually for the main nozzle and suction side pressure than the export side of the majority of auxiliary nozzle auxiliary nozzle and stretching the nozzle pressure, if different pressure using different storage tanks, to the effect of save gas consumption.
4.Select the energy-saving auxiliary nozzle
Jet looms are mainly European, Japanese and domestic. The auxiliary nozzle of the European model is porous and shaped, and the trachea shape is curved, such as the jet loom of the company. The Japanese machine's auxiliary nozzles are small holes and single holes, and the trachea shape is square, such as tsu tsu, Toyota's jet loom.
Porous and heterotypic hole of the main brands are sulzer, thing, shu meetall, etc., the advantages of porous auxiliary nozzle for the air softer, air flow area is larger, the weft is not easy to strain, and has good tolerance to the weft, therefore, weft insertion is more stable but large gas consumption. The advantages of single hole nozzle are fast speed and good cluster, so the gas consumption is low, but the insertion is not stable enough.
Airflow velocity and flow flow are two basic conditions for the completion of the insertion of auxiliary nozzle. In order to reduce the gas consumption, it is required to reduce the air supply pressure on the premise of ensuring smooth insertion. The data shows that the domestic energy-saving auxiliary nozzle with national utility model patent has good energy saving effect. Around the nozzle of the central has a big hole, there are seven holes, in order to spit out the multibeam airflow a song "pawns", using around the central coarser dominated airflow to gather the multibeam finer airflow, so as to improve the cluster, and reduce the diffusion, achieve the goal of the throttle. The test shows that the energy-saving 8-hole auxiliary nozzle is more efficient than the current one and the imported auxiliary nozzle, which can reduce the total air consumption by 21.5%. The nozzle interchangeability can be applied to various models, which is the ideal new method to solve the energy consumption of jet loom.
5.Adjust the spray Angle and spray Angle in time
The auxiliary nozzle consists of base, tube sleeve and nozzle. The nozzle is controlled by stainless steel and is about 0.5mm thick. Nozzle head end flat, open with jet holes, the nozzle plane Angle, jet direction pointing to the reed groove, jet Angle is commonly 8 ° ~ 9 °. Nozzle and the pipe set of generally used resin consolidation, a positioning screw according to certain Angle and base, called spraying Angle, is commonly 4 ° ~ 6 °. The injection Angle and spray Angle are the two angles to determine the direction of injection. It determines whether the auxiliary nozzle airflow can be accurately directed to the reed, which should attract sufficient attention in the actual installation and debugging.
The size of the incident distance is directly affected by the wind speed of the nozzle airflow of the auxiliary nozzle, and the flow velocity of the auxiliary nozzle at the incident point is effective for the insertion of the weft, which is called effective wind speed. Obviously, a larger spray Angle can achieve greater effective wind speed. However, considering the effective wind speed will be too much of main nozzle airflow collision interference is too big, so the determination of spraying Angle should be based on the strength of the main nozzle airflow speed high and low, both there are both the effective speed of the larger and smaller interference effect, and different pass auxiliary nozzle has a best spray Angle. Therefore, each plant must ensure that the auxiliary nozzle of each group has good consistency to achieve the aim of improving the quality of weft and saving gas consumption.
When the actual velocity center line and the auxiliary nozzle geometric center line of the nozzle is a certain Angle, will inevitably affect the main nozzle and the auxiliary nozzle airflow concurrent effect, which affects the quality of weft insertion, solar terms. Will produce a certain Angle because the auxiliary nozzle inner cavity caused by complex shapes, because some flow injection and with other auxiliary nozzle at the top of the back to collide with each other on air flow in the nozzle hole leads to the formation of the Angle. The test shows that the size of the Angle is related to the hole shape, air pressure size and nozzle type. If, therefore, in the production of replacement products, adjusting the speed and the need to raise and lower air pressure, it is important to consider because of these reasons influence on this Angle, and make timely adjustment on the incidence of auxiliary nozzle airflow parameter.